K Service Source iMac (Summer 2001) Updated 11July 2005 © 2001 Apple Computer, Inc. All rights reserved.
K Service Source Take Apart iMac (Summer 2001) Updated 11 July 2005.
Take Apart - 2 What’s New New Models There are four models of the iMac: the 500 MHz iMac in Indigo (Education only), the 500 MHz in Indigo and Snow, the 600 MHz iMac in Graphite and Snow, and the 700 MHz iMac Special Edition in Graphite and Snow. Note: The 500 MHz Education iMac uses logic board 661-2447.
Take Apart - 3 Part Changes for iMac (Summer 2001) • Logic boards: – added 661-2548, 700 MHz board – 661-2447, 500 MHz board is now used in educational iMacs, previously it was an international board only • Hard drives: – added 661-2521, 60 GB Hard Drive • External plastics – added 922-4609, Front Outer Bezel, Snow, Rev.
Take Apart - 4 The following take apart procedures for the iMac (Summer 2001) computers are identical to take apart procedures for iMac (Early 2001) and iMac (Summer 2000) computers. The Indigo Mac (Summer 2000) was used for all the pictures in this chapter.
Take Apart - 5 Tools The following tools are recommended for the take apart procedures: • phillips screwdriver (No.1 and No.
Take Apart Bottom Housing With Flip Foot - 6 Procedures Bottom Housing With Flip Foot Before you begin, position the computer face down, resting the computer on an ESD mat or other soft surface.
Take Apart Bottom Housing With Flip Foot - 7 1. Using a plastic flatblade screwdriver, remove the VGA vented cover. 2. Remove the two screws near the flip foot.
Take Apart Bottom Housing With Flip Foot - 8 3. Remove the video out access door from the bottom housing.
Take Apart Bottom Housing With Flip Foot - 9 4. Remove the two outer screws located near the video out port. Replacement Note: The bottom housing uses two sizes of screws. The two shorter screws attach near the flip foot.
Take Apart Bottom Housing With Flip Foot - 1 0 5. Pull the bottom housing off the computer.
Take Apart Bottom Housing With Flip Foot - 1 1 Bottom Housing Replacement Note 1. Align the three tabs on the bottom housing with the tab slots on the front outer bezel. Ensure that the center tab is properly aligned or CDs and DVD discs may not eject from the slot. 2. Lower the bottom housing into place and replace the screws.
Take Apart EMI Cover - 1 2 EMI Cover Before you begin: • Position the computer upside down, resting the computer on an ESD mat or other soft surface. • Remove the bottom housing.
Take Apart EMI Cover - 1 3 1. Remove the six screws on the EMI cover.
Take Apart EMI Cover - 1 4 2. Lift the EMI cover off the computer. Note: Be careful of the VGA output port.
Take Apart EMI Cover - 1 5 Replacement Note: Position the rear of the EMI cover into place first, positioning the EMI cover over the video port (if present). Continue lowering the cover into place by gently squeezing in on both sides, as you lower the cover into position.
Take Apart SDRAM DIMM - 1 6 SDRAM DIMM Before you begin, position the computer face down, resting the CRT on an ESD mat or other soft surface.
Take Apart SDRAM DIMM - 1 7 1. With a flatblade screwdriver or coin, turn the colored latch counterclockwise on the access door. 2. Pull the access door down to open.
Take Apart SDRAM DIMM - 1 8 3. Push down on the plastic tabs to release the SDRAM module(s). 4. Carefully lift the SDRAM from the slot. Note: Remove installed SDRAM from the logic board before returning the logic board to Apple.
Take Apart AirPort Card - 1 9 AirPort Card Before you begin, position the computer face down, resting the CRT on an ESD mat or other soft surface. Note: If the AirPort Card is not installed, a protective antenna cap will be attached to the antenna.
Take Apart AirPort Card - 2 0 1. With a flatblade screwdriver or coin, turn the colored latch to open the access door. The antenna and AirPort Card will be visible when you open the access door. Note: If the AirPort card is not installed, a clear protective antenna cap will be attached to the antenna.
Take Apart AirPort Card - 2 1 2. Remove the AirPort Card by lifting the card straight up and out of the card guides and connector.
Take Apart AirPort Card - 2 2 3. Disconnect the antenna from the small hole AirPort Card.
Take Apart AirPort Card - 2 3 4. Remove the ground clip from the AirPort Adapter Card. 5. Using the pull tab, separate the AirPort Card from the adapter card.
Take Apart CD/HD Carrier - 2 4 CD/HD Carrier Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following: • bottom housing • EMI cover • SDRAM
Take Apart CD/HD Carrier - 2 5 1. Remove the four screws connecting the CD/HD drive carrier to the metal chassis (also known as the divider panel).
Take Apart CD/HD Carrier - 2 6 2.
Take Apart CD/HD Carrier - 2 7 3. Tilt the CD/HD carrier forward and lift the carrier out of the computer. Note: Continue with the Take Apart procedures if you are replacing the CD-ROM, DVD-ROM, or the hard drive.
Take Apart CD-ROM / DVD-ROM/CD-RW - 2 8 CD-ROM / DVDROM/CD-RW Note: The procedures for removing a CD-ROM, DVDROM and CD-RW are identical. This procedure will reference the CD-ROM Take Apart.
Take Apart CD-ROM / DVD-ROM/CD-RW - 2 9 1. Using a Phillips screwdriver, remove the CD/HD carrier mounting screws (two on each side).
Take Apart CD-ROM / DVD-ROM/CD-RW - 3 0 2. Carefully turn the CD/HD drive carrier over. 3. Holding onto the CD-ROM from the rear, lift the CD-ROM carrier out of the CD/HD carrier. Important: Don’t press or squeeze the front of the CD-ROM. Squeezing the front could bend the metal housing, making it impossible to insert or remove a CD or DVD disc.
Take Apart CD-ROM / DVD-ROM/CD-RW - 3 1 4. Using a jeweler’s screwdriver, remove the four screws (two on each side) on the CD/ DVD carrier. 5. Lift the CD-ROM from its carrier.
Take Apart CD-ROM / DVD-ROM/CD-RW - 3 2 6. On the back of the CDROM, Use a jeweler’s screwdriver to remove the two screws on the adapter board. 7. Remove the adapter board from the CD-ROM. Note: Return the drive to Apple without the cables, carrier, or the adapter board. Refer to the parts database for more information.
Take Apart CD-ROM / DVD-ROM/CD-RW - 3 3 CD-ROM, DVD-ROM,CDRW Module Replacement Position the drive into its carrier as shown. 1. Check that the yellow warning label is face up. Note: if you are installing a new drive carrier, remove the blue film covering the grounding pad.
Take Apart CD-ROM / DVD-ROM/CD-RW - 3 4 2. Lower the CD/DVD carrier into the CD/HD carrier. 3. Push the CD/DVD carrier forward so the carrier tabs go through the holes on the CD/HD carrier. 4. Replace the CD/HD carrier screws.
Take Apart CD-ROM / DVD-ROM/CD-RW - 3 5 5. Holding the drive carrier in the orientation shown, make sure the CD-ROM or DVD-ROM is correctly installed into the CD/HD carrier. 6. Make sure the Slave/ Master switch on the back of the drive is still set to the Slave mode (set to the left).
Take Apart CD/DVD/CD-RW Adapter Board - 3 6 CD/DVD/CD-RW Adapter Board Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following: • bottom housing • EMI cover • SDRAM • CD/HD carrier
Take Apart CD/DVD/CD-RW Adapter Board - 3 7 1. Using a jeweler’s screwdriver, remove the two screws on the CD/DVD adapter board. 2. Remove the adapter board from the back of the CD-ROM. Note: Return the CD/DVDROM drive to Apple without the cables, carrier, or the adapter board. Refer to the parts database for more information.
Take Apart Hard Drive - 3 8 Hard Drive Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following: • bottom housing • EMI cover • SDRAM
Take Apart Hard Drive - 3 9 1.
Take Apart Hard Drive - 4 0 Note: The hard drive carrier shown was removed from the computer. However, you can easily remove the hard drive while the carrier is still screwed down to the chassis. Continue with the procedure. 2. Using a #1 Phillips screwdriver, remove the four hard drive mounting screws.
Take Apart Hard Drive - 4 1 3. Slide the hard drive out of the CD/HD carrier. Note: Return the drives without the cables or carriers. Exchange Apple hard drive modules likefor-like in Apple packaging. Failure to comply with this requirement may result in a packaging noncompliance charge. Refer to the parts database for more information.
Take Apart Hard Drive - 4 2 Hard Drive Replacement When installing the hard drive into the CD/HD carrier, make sure the hard drive is component side up (as shown).
Take Apart Logic Board - 4 3 Logic Board Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following: • bottom housing • EMI cover The logic board and the down converter board are removed together (still connected to each other), and are separated once they are removed from the computer.
Take Apart Logic Board - 4 4 Note: Remove SDRAM to make cable removal easier. 1. On the back of the CD/HD carrier, disconnect the: • hard drive power cable • hard drive data cable • CD-ROM/DVD-ROM data cable • logic board cable connector 2. Disconnect the antenna if it’s connected to the AirPort Card, or it it’s attached to the protective antenna cap.
Take Apart Logic Board - 4 5 3. Remove the six screws on the logic board and five screws on the down converter board. Note: The two screws located at the top of the down converter board (near the speaker) are larger screws than the other screws (with washers).
Take Apart Logic Board - 4 6 4. Gently lift the down converter board and logic board out of the computer.
Take Apart Logic Board - 4 7 5. Using a flatblade screwdriver, pry the plastic rivet off the board. Put the top half of the rivet back into the bottom half so it doesn’t get lost.
Take Apart Logic Board - 4 8 6. Holding onto the down converter, press down on the black connector to separate the down converter board from the logic board. Note: If you are returning the logic board to Apple refer to the parts database and remove the SDRAM, any cables, the modem, the AirPort Card, and I/O panel. Replacement Note: When reinstalling the logic board, refer to the next page about installing a thermal pad.
Take Apart Logic Board - 4 9 Thermal Pad Information The following logic boards use a thermal pad: • 661-2425, 500 MHz • 661-2426, 600 MHz • 661-2458, 700 MHz Back View Thermal Pad Front View The thermal pad prevents the microprocessor from overheating. It is crucial that a new thermal pad be used each time you detach the logic board from the divider panel assembly. (Exception: if you are testing the logic board and detach it for a few minutes).
Take Apart Logic Board - 5 0 Thermal Pad Installation 1. Remove the old thermal pad from the microprocessor (or, it may be stuck to the divider panel). Thermal Pad 2. Remove the protective backing from either side of the new thermal pad and place it on the microprocessor. 3. Press down on the pad to make sure it has even contact without air pockets. 4.
Take Apart Logic Board - 5 1 backing from the exposed side of the thermal pad. 5. Install the logic board back on to the divider panel. Note: Avoid unnecessary contact with either side of the thermal pad as dirt or body oils reduce the thermal conductivity of the pad. Thermal Pad Divider Panel For additional information, refer to Kbase article 58792, “Microprocessor Thermal Pad Replacement”.
Take Apart Down Converter Board - 5 2 Down Converter Board Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following: • bottom housing • EMI cover Note: The logic board and the down converter board are removed together (still connected to each other), and are separated once they are removed from the computer.
Take Apart Down Converter Board - 5 3 Note: Remove SDRAM to make cable removal easier. 1. On the back of the CD/HD carrier, disconnect the: • hard drive power cable • hard drive data cable • CD-ROM/DVD-ROM data cable • logic board cable connector 2. Disconnect the antenna if it’s connected to the AirPort Card, or it it’s attached to the protective antenna cap.
Take Apart Down Converter Board - 5 4 3. Remove the six screws on the logic board and five screws on the down converter board. Note: The two down converter screws located near the speaker are larger screws than the rest of the down converter screws.
Take Apart Down Converter Board - 5 5 4. Lift the boards out of the computer.
Take Apart Down Converter Board - 5 6 5. Using a flatblade screwdriver, pry the rivet off the logic board. Put the top half of the rivet back into the bottom half so it doesn’t get lost.
Take Apart Down Converter Board - 5 7 6. Holding onto the boards, press down on the black connector and separate the down converter board from the logic board. Replacement Note: When reinstalling the logic board, make sure the antenna wire is not underneath the board.
Take Apart Modem - 5 8 Modem Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following: • bottom housing • EMI cover • logic board Note: The modem is located on the underside of the logic board.
Take Apart Modem - 5 9 1. With the logic board facing right side up, disconnect the cable at J12. 2. Remove the two screws on the I/O panel.
Take Apart Modem - 6 0 3. Turn the logic board to the underside and remove the modem screw.
Take Apart Modem - 6 1 4. Rotate the logic board right side up again. Carefully slide the I/O panel off the logic board. Note: As you slide the I/O panel off the logic board, support the modem with your other hand so the modem doesn’t fall off the logic board. 5. Remove the modem from its connector slot on the underside of the logic board.
Take Apart Modem - 6 2 Modem Replacement The I/O panel and the modem are sandwiched between the logic board and the metal frame of the I/O panel. The metal frame fits on top of the logic board, over the screw holes. On the underside of the logic board, the screw tab goes under the modem. Replacement Note: After replacing an international modem, use the Modem Country Selector utility to set the modem to the correct country.
Take Apart I/O Panel - 6 3 I/O Panel Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following: • bottom housing • EMI cover • logic board
Take Apart I/O Panel - 6 4 1. Disconnect the cable at J12, going from the logic board to the I/O panel. 2. Remove the two screws on the I/O panel.
Take Apart I/O Panel - 6 5 3. Turn the logic board over and remove the modem screw.
Take Apart I/O Panel - 6 6 4. Rotate the logic board face up again and carefully slide the I/O panel off the logic board. Note: As you slide the I/O panel off the logic board, support the modem with your hand so the modem doesn’t fall off the logic board.
Take Apart Front Outer Bezel - 6 7 Front Outer Bezel Before you begin, place the computer on an ESD mat and remove the bottom housing. Note: The Snow iMac has a new part number for the front outer bezel, 9224609.
Take Apart Front Outer Bezel - 6 8 1. With a jeweler’s screwdriver, carefully remove the two tabs on the front outer bezel. Refer to the next graphic for a close-up of the tab removal.
Take Apart Front Outer Bezel - 6 9 2. After removing the tabs, remove the screws located under the tabs.
Take Apart Front Outer Bezel - 7 0 Note: The bezel tabs fit tightly into the rear housing. A good, hard pull upward is required to release all the tabs. 3. Insert a plastic tool underneath the bezel. 4. Pry the outer bezel tabs from the rear housing with a plastic tool. As you push and pry the tool inside the bezel, the side tabs will start to release. 5. Insert the tool on the left side of the bezel and repeat.
Take Apart Front Outer Bezel - 7 1 6. As the tabs start to release, pull hard on the front outer bezel to release the tabs completely.
Take Apart Top Rear Housing - 7 2 Top Rear Housing ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety. From the Service Source Online home page, click Troubleshoot and Repair. Then click on Safety under the Tools list.
Take Apart Top Rear Housing - 7 3 1. Remove the two tabs (screw caps) on the top inner bezel. Refer to the next page for a close-up of the tab removal.
Take Apart Top Rear Housing - 7 4 2. Pry the tabs off, and remove the two screws under each tab.
Take Apart Top Rear Housing - 7 5 3. Position the computer face down. 4. Remove four screws and loosen the fixed screw (at the top) on the rear housing.
Take Apart Top Rear Housing - 7 6 5. Position the computer right side up. Push down and pull out on the rear housing to unhook the rear housing tabs that connect to the inner bezel.
Take Apart Top Rear Housing - 7 7 6. Lift the top rear housing off the computer.
Take Apart Divider Panel - 7 8 Divider Panel Many service parts, such as the speakers, power/ analog/video board, side panels, cables, and the headphone board, are connected to the divider panel. The divider panel is the metal chassis with EMI foam. The divider panel is not available as a service part on the iMac (Early 2001) computer.
Take Apart Divider Panel - 7 9 The thermal pad (A) and the divider panel(B) are used on the following logic boards: • 661-2425, 500 MHz • 661-2426, 600 MHz • 661-2458, 700 MHz
Take Apart Power/Analog/Video Board - 8 0 Power/Analog/Video Board Before you begin, discharge the CRT, rest the computer on an ESD mat or other soft surface and remove the following: • bottom housing • front outer bezel • top rear housing Note: There are two power/ analog/video boards, part number 661-2465 (with a switch at SW901) and 6612466. Exchange like-forlike.
Take Apart Power/Analog/Video Board - 8 1 ±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, discharge the CRT. 1. Disconnect the microphone connector located near the top of the CRT. 2. Unwrap the bendable cable wraps in the upper left and upper right corners of the CRT. 3. Disconnect the anode cap.
Take Apart Power/Analog/Video Board - 8 2 4. Lift the degauss cable out of the way to access the side panel screws. 5. Using a narrow shaft screwdriver, remove the four side panel screws (two on each side) that attach the left and right side panels to the inner bezel.
Take Apart Power/Analog/Video Board - 8 3 6. Open the CRT cable clamps. Remove the wires from the cable clamps.
Take Apart Power/Analog/Video Board - 8 4 7. Partially lift the side panels (with the power/ analog/video board attached to the divider panel) up and off the inner bezel to gain access to connector P501 located at the bottom of the power/ analog/video board.
Take Apart Power/Analog/Video Board - 8 5 8. Disconnect P501 and P701 on the power/ analog/video board. The cables are located near the high voltage capacitor.
Take Apart Power/Analog/Video Board - 8 6 9. On the other side of the CRT neck, disconnect the brown degauss cable, P901, from the power/ analog/video board. Remove P901 from the cable clamp.
Take Apart Power/Analog/Video Board - 8 7 10. At the very bottom of the power/analog/video board, near the bottom of the CRT, disconnect P902, which is part of the audio/headphone/ LED/speaker cable assembly.
Take Apart Power/Analog/Video Board - 8 8 11. Disconnect the two ground cables on the video board. Important: Be careful when working around the CRT neck rings. If the neck rings are bumped, the CRT will be knocked out of adjustment, and will require replacement of the CRT.
Take Apart Power/Analog/Video Board - 8 9 12. Loosen the CRT neck clamp screw.
Take Apart Power/Analog/Video Board - 9 0 13. Carefully pull the video board off the CRT neck.
Take Apart Power/Analog/Video Board - 9 1 14. Holding on to the side panels, lift the power/ analog/video board (which is attached to the side panels and divider panel) from the inner bezel.
Take Apart Power/Analog/Video Board - 9 2 15. Remove the ten screws and pinch the two standoffs with a needlenose pliers to lift the power/analog board off the divider panel.
Take Apart Power/Analog/Video Board - 9 3 16. Lift the board from the flyback transformer side to clear the power plug from the side panel. 17. Pull the board forward toward the speakers. Replacement Note: If you’re returning the power/ analog/video board to Apple, exchange the board likefor-like and leave the cables attached to the board.
Take Apart Power/Analog/Video Board - 9 4 ßπ 6 6 1 - 2 4 6 5 (with switch at SW901) Identifying Power/Analog/ Video Boards There are two power/ analog/video boards in service stock. The part numbers are 661-2465 and 661-2466. These boards must be exchanged like-forlike. 661-2466 The 661-2465 board can be identified by the presence of a switch at location SW901, located near the flyback transformer. Refer to the next page for switch instructions.
Take Apart Power/Analog/Video Board - 9 5 Switch Instructions If the iMac has the analog board with the switch, the switch must be set for the type of the CRT (LG or CPT) tube in the computer. If the power/analog/video board or the CRT are replaced, make sure to set the switch to the appropriate position. Refer to the next page for information on how to identify an LG and CPT CRT.
Take Apart Power/Analog/Video Board - 9 6 LG CRT Identify an LG CRT by the black plastic molding located on the CRT neck. The LG molding has the LG name at the top and three holes. If the iMac uses the 6612465 power/analog board (with the switch) and the tube is an LG CRT, make sure the switch is set to LG.
Take Apart Power/Analog/Video Board - 9 7 CPT CRT Identify a CPT CRT by the black plastic molding located on the CRT neck. The CPT molding has two holes in the molding. If the iMac uses the 6612465 power/analog board (with the switch) and the tube is a CPT CRT, make sure the switch is set to CPT.
Take Apart Side Panels - 9 8 Side Panels ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, discharge the CRT.
Take Apart Side Panels - 9 9 1. Undo the wire wraps in the top corners or the CRT. 2. Lift the degauss cable out of the way to access the side panel screws. There are two screws on each side.
Take Apart Side Panels - 1 0 0 3. On the rear of the side panels, remove four screws. These screws connect the side panels to the divider panel (the metal chassis).
Take Apart Side Panels - 1 0 1 4. At the top rear of the side panels, pull each side panel off the plastic pin. (The left and right side panels are identified when viewing the computer from the rear.) Note: To separate the left panel from the right panel, remove the two rear bracket screws. Otherwise, lift the side panels off as a unit (next graphic) and separate the panels later.
Take Apart Side Panels - 1 0 2 5. Pull the panels out to the sides a bit, and then lift the side panels up and off the computer.
Take Apart Side Panels - 1 0 3 6. Carefully remove the antenna wire from each side panel. 7. Pull the side panel off the metal divider panel. If necessary, repeat these steps for the other side panel.
Take Apart Antenna - 1 0 4 Antenna ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, discharge the CRT.
Take Apart Antenna - 1 0 5 • front outer bezel • top rear housing • divider panel assembly
Take Apart Antenna - 1 0 6 1. Remove the three screws and cable clip on the antenna.
Take Apart Antenna - 1 0 7 2. Important: Note how the antenna wire is routed through the side panel before removing. A close-up view of the right panel antenna is shown here. Carefully remove the antenna from the right side panel.
Take Apart Antenna - 1 0 8 3. Carefully remove the antenna from the left side panel. Refer to the next page for a close up of the antenna in the left side panel.
Take Apart Antenna - 1 0 9 4. This shows a close up view of the antenna in the left side panel.
Take Apart Antenna - 1 1 0 5. Before removing the antenna from the divider panel, mark the hole (with a pen tip) that the antenna passes through so you know which hole the antenna goes into when replacing the antenna.
Take Apart Antenna - 1 1 1 6. Remove the antenna board from the divider panel.
Take Apart Speakers - 1 1 2 Speakers Before you begin, rest the computer on an ESD mat or other soft surface, and remove the bottom housing. The EMI cover is removed in this photo, but it is not necessary to remove it to access the speakers.
Take Apart Speakers - 1 1 3 1. Disconnect the short speaker cable next to the speaker. 2. Note: If you are certain a speaker is faulty, the easiest removal method is to gently push the speaker down in the direction of the arrow. This will bend the biggest tab (there are three tabs) that connects the speaker to the divider panel. 3. Twist the speaker back and forth and slide it off the divider panel.
Take Apart Headphone Board - 1 1 4 Headphone Board ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, discharge the CRT.
Take Apart Headphone Board - 1 1 5 1. Turn the divider panel over. 2. Remove the speaker to access the headphone/ audio board screw. 3. remove the screw using a stubby (short) screwdriver. 4. Disconnect the connector from the headphone board. 5. Remove the headphone board from the divider panel.
Take Apart Power/LED Board - 1 1 6 Power/LED Board ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, discharge the CRT.
Take Apart Power/LED Board - 1 1 7 1. Turn the divider panel over and remove the speaker to access the power/LED board screw. 2. Remove the screw using a stubby screwdriver. 3. Disconnect the cable from the connector. 4. Remove the power/LED board from the divider panel.
Take Apart CRT - 1 1 8 CRT ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety on Service Source online and discharge the CRT.
Take Apart CRT - 1 1 9 1. Remove the four CRT screws. 2. Remove the ground wire. 3. Lift the CRT from the inner bezel. Caution: Be careful when working around the CRT neck rings. If the neck rings are bumped, the CRT will be knocked out of adjustment, and will require replacement of the CRT.
Take Apart Replacing the CRT - 1 2 0 Replacing the CRT CRT Notice, July 2005 Two vendors (LG and CPT) used to supply the CRT for all iMac computers with a slot-loading CD-ROM, DVDROM, or CD-RW drive. As of July 2005, Apple Service will carry only the CPT CRT (shown). Important: The CPT CRT must be paired with a Hon Hai power/analog board, either 661-2465 or 6612315.
Take Apart Replacing the CRT - 1 2 1 1. When you replace the CRT, identify if the computer has an LG or Hon Hai power/analog board installed. • Hon Hai boards have a switch at SW901 (see graphic). • LG boards do not have a switch at SW901 and are not compatible with the CPT CRT.
Take Apart Replacing the CRT - 1 2 2 2. If you have an LG board, (shown on the left) you need to order a Hon Hai board: 661-2465 or 661-2315. 3. Set the switch on the Hon Hai board, SW901 to CPT.
Take Apart Replacing the CRT - 1 2 3 Switch Settings for the LG CRT If you have an LG CRT, and a Hon Hai power/analog board, set the switch on the Hon Hai board to LG. One way to quickly identify an LG CRT is by the black sticker located on the left side of the CRT. The sticker covers the LG vendor label. Refer to Kbase article 95060 for more information on how to identify CRT models.
Take Apart Replacing the CRT - 1 2 4 Identifying the LG CRT Identify the LG CRT by the plastic molding on the CRT neck. The LG name and three holes can be seen on the plastic molding. If the iMac uses the 6612465 power/analog board (with the switch) and the tube is an LG CRT, make sure the switch is set to LG.
Take Apart Replacing the CRT - 1 2 5 Identifying the CPT CRT The CPT CRT can be identified by the plastic molding on the CRT neck. The CPT CRT molding has two holes in the molding. If the iMac uses the 6612465 power/analog board (with the switch) and the tube is a CPT CRT, make sure the switch is set to CPT.
Take Apart Microphone - 1 2 6 Microphone ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety on Service Source online.
Take Apart Microphone - 1 2 7 1. Unwrap the bendable cable wrap. 2. Disconnect the microphone connector.
Take Apart Microphone - 1 2 8 3. Pull the microphone from the inner bezel.
Take Apart Microphone - 1 2 9 Replacing the Microphone 1. Insert the microphone into the inner bezel with the loop facing down, toward the CRT. 2. Push the microphone through the hole on the inner bezel (see photo on the next page).
Take Apart Microphone - 1 3 0 3. Check that the microphone protrudes through the inner bezel hole.
Troubleshooting Introduction - 1 Introduction Troubleshooting procedures for the iMac (Summer 2001) computers are almost identical to the iMac (Early 2001) and iMac (Summer 2000) computers. Read below to see what’s new and different. Troubleshooting information for the iMac can also be found in Apple’s Knowledge Base (http://kbase.info.apple.com). Refer to article 95143, iMac: Troubleshooting Procedures, or to article 95148, iMac (Summer 2001): Service Repair Manual. What’s New and Different: 1.
Troubleshooting Introduction - 2 Searching the Knowledge Base In the Knowledge Base, use the expert search to locate troubleshooting articles. In the expert search window, type in the keywords: “kssts” and “imac”, click the “Use ALL words (AND)” radio button and then click the Continue button (see Figure 1 below).
Troubleshooting Troubleshooting Procedures - 3 Troubleshooting Procedures This chapter contains basic theory of operations information as well as detailed Symptom/Cure tables, both of which should help you troubleshoot and repair the iMac (Summer 2001) computer. The Symptom/Cure tables are broken down into two sections: problems that can occur at startup time-before the Finder appears on the screen; and problems that can occur after a successful startup. Each major symptom has its own symptom/ cure table.
Troubleshooting Block Diagram/ Searching the Knowledge Base - 4 Block Diagram System Block Diagram The following illustration providesElectronics an overview of the iMac Digital internal components and shows Video Neck Board Hard Drive CD-ROM Drive how they are connected.
Troubleshooting Power Flow - 5 Power Flow Power is controlled in the iMac system by the power/analog board. Once the unit is plugged in, power flows from the AC outlet at the wall to the AC inlet on the power/analog board. From there, the power flows through the main cable on the power/analog board, to the video neck board, down converter board, logic board, and all its attached components.
Troubleshooting Testing for Power - 6 Testing for Power The iMac requires trickle voltage (+5 TRKL) in order to poweron. If you are experiencing power problems in the iMac unit, you will want to test for trickle power to pinpoint the location of the problem and to determine whether or not the power supply/analog board is functioning normally. If you have trickle power in the system, the odds are your power/analog board is OK. In general, you should test for power at the AC outlet first.
Troubleshooting Testing for Power - 7 At the Logic Board With the iMac placed with the CRT face down on a soft surface, remove the bottom housing and the EMI cover to access the logic board. Testing J9 for +5 V Trickle Power on the Logic Board You will need a volt meter to test for power on the logic board. Refer to the picture on the next page to locate the necessary test point referenced in the following procedure. Plug in the computer, but leave the iMac powered OFF.
Troubleshooting Testing for Power - 8 Testing DCO (Down Converter On) Voltage at C4 on the Logic Board In a No Power situation, first check for +5 V trickle power at J9 (refer to “Testing J9 for +5 V Trickle Power on the Logic Board”), then check the DCO (Down Converter On) voltage on the logic board at capacitor C4 (see figure below). The DCO voltage should be present as soon as the power cord is plugged into the computer.
Troubleshooting Testing for Power - 9 Testing J7 for Voltage on the Logic Board The following voltages measure if the down converter is providing the required voltages and are only present if the system is powered on. If the following voltages are not correct, refer to the “No Power” troubleshooting symptom chart. Measure the following voltages at J7 on the logic board: 1. Pin 2: +12 volts 2. Pin 4: +5 volts 3. Pin 14: +3.
Troubleshooting Testing for Power - 1 0 Testing the Power/Analog Board Fuse First remove the bottom housing, front outer bezel, and the top rear housing to access the power/analog board. The fuse is located near the AC plug. Warning: You must unplug the iMac to do a continuity test at the power supply board fuse. You will need an ohm meter to do a continuity test on the power supply board fuse. Refer to the picture below to located the necessary test point referenced in the following procedure.
Troubleshooting The PMU Chip - 1 1 The PMU Chip The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for the computer. The PMU is a computer within a computer. It has memory, software, firmware, I/O, two crystals, and a CPU. Its function is to: • Tell the computer to turn on, turn off, sleep, wake, idle, etc. • Manage system resets from various commands. • Maintain parameter RAM (PRAM). • Manage the real-time clock.
Troubleshooting Resetting the PMU on the Logic Board - 1 2 Resetting the PMU on the Logic Board Resetting the PMU (Power Management Unit) on the logic board can resolve many system problems. Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules. 1. Disconnect the power cord and check the battery in the battery holder (BT1). The battery should read 3.3 to 3.7 volts.
Troubleshooting Power-On Self Test - 1 3 Power-On Self Test There is a power-on self test that resides in the ROM of the iMac. This test automatically runs whenever the iMac is powered on after being fully shut down (the power-on self test does not run if the machine is only restarted). If a problem is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.
Troubleshooting Logic Board Battery - 1 4 Logic Board Battery Important: Apple highly recommends removing the battery when handling the logic board. Make sure to use proper ESD protection when handling modules. The battery on the logic board controls the stored system settings, such as date and time. It is only necessary to test the battery when you can’t power on the computer, or the date and time are reset every time the AC power is removed.
Troubleshooting Ejecting a CD or DVD Disc, Part 1 - 1 5 Ejecting a CD or DVD Disc, Part 1 The CD/DVD eject mechanism is electrical rather than mechanical on the iMac. If you wish to eject a bootable CD-ROM disc at startup, simply hold down the mouse button until it ejects. If the CD is not a bootable disc, simply wait for the iMac to boot and drag the CD icon to the trash can. If this fails to release the CD, there is an eject button which can be activated by a small, blunt object such as a paper clip.
Troubleshooting Ejecting a CD or DVD Disc, Part 2 - 1 6 Ejecting a CD or DVD Disc, Part 2 There are two internal levers on a slot-loading CD-DVD drive that help center a CD-DVD disc. Some CDs and DVDs have and uneven edge which can cause enough friction to prevent the disc from ejecting. If this happens, follow these steps: 1 Take a large paperclip and unbend it so that you can insert it into the CD/DVD slot (as shown below) about 1.5 inches from the left edge of the slot.
Troubleshooting HFS Plus Formatted Drives - 1 7 HFS Plus Formatted Drives The hard drive in the iMac is formatted with HFS Plus (also referred to as Mac OS Extended format). It is important to note that Norton Utilities version 3.5 is not compatible with HFS Plus (or Mac OS Extended format), and in fact, can destroy data on the hard drive. Norton Utilities version 3.5.3 or 3.5.2 will not attempt to repair a drive formatted with Mac OS Extended format and versions 3.5.
Troubleshooting Testing the Modem - 1 8 Testing the Modem The iMac ships with AppleWorks software, which can be used to test the iMac modem connection. You should run this test if the modem is not able to dial out. To perform this test: 1. Locate and launch AppleWorks. 2. From the AppleWorks New Document window, select Communications and click OK. You will be presented with an untitled communications document. 3.
Troubleshooting Testing the Modem - 1 9 A good test to see if the phone line is working is to type “ATDT”, which will open the phone line. If the modem reports NO DIALTONE, there isn't a valid analog line connected. If the phone line works, you will hear a dial tone until you press the Return key, at which time the modem will report NO CARRIER. A No Carrier message means the phone line was successfully opened. Other things that can be done here are: • Call another modem to verify connections.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder Symptom/Cure Tables: Startup Problems Before the Finder Appears If you have trouble starting up the iMac, and the problem occurs before the Finder appears on the screen, you may have either a software or a hardware problem. Following are troubleshooting tables with problem symptoms that you may see before the Finder appears.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder No Power In a “No Power” situation, the system is completely dead. There is no LED, no hard drive power, and the screen is completely black. (Refer to “Testing for Power” earlier in this chapter for instructions on how to test for power at each component referenced in this procedure.) Possible Cause Possible Fix Bad power cord, connection, or outlet. - Verify the power outlet is good.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder In a “No Power” situation, the system is completely dead. There is no LED, no hard drive power, and the screen is completely black. (Refer to “Testing for Power” earlier in this chapter for instructions on how to test for power at each component referenced in this procedure.) Possible Cause Possible Fix Bad power/analog/video board -Verify the fuse at F901 on the power/analog board is good.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder No Video or Unstable Raster Normal startup boot chime, the LED is on, and the hard drive starts up. The display, however, is solid gray. Possible Cause Possible Fix Corrupted PRAM. - Reset parameter RAM. Hold down
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder Normal startup boot chime, the LED is on, and the hard drive starts up. The display, however, is solid gray. Possible Cause Possible Fix Bad power/analog/video board - Check for trickle power on the logic board (Refer to “Testing J9 for +5 V Trickle Power on the Logic Board” mentioned earlier in this chapter). Trickle power is present as soon as the power cord is plugged into the computer.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder Gray Screen In a “Gray Screen Raster” situation, you will get a normal startup boot chime and the system will have a green LED. The display, however, will have a solid gray screen with no cursor or desktop displayed. Possible Cause Possible Fix Corrupted system software. - Boot off the system CD that came with the unit. Do you see a normal screen display now? Yes: Reinstall system software.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder Error Beep(s) If you hear from one to five error beeps at startup with no boot chime, you have a hardware problem. The table explains how to troubleshoot and repair an iMac unit that sounds one or more error beeps at startup. Possible Cause Possible Fix No DRAM is installed or detected. Do you hear one error beep at startup? Yes: Follow these steps to resolve the problem: 1. Make sure the DRAM are PC-100 SDRAM.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder Flashing Question Mark This problem refers to a flashing question mark that appears on the screen during startup. Possible Cause Possible Fix Corrupted system software or software drivers. Boot from the system CD that came with the unit. Can you see the hard drive on the desktop? Yes: The system software is most likely the problem. Reinstall system software.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder System Hangs During Boot This problem refers to a system that begins a normal startup process with a boot chime and normal display, but then freezes before the Finder appears. Possible Cause Possible Fix System extensions causing a conflict. Boot with Extensions off by holding down the Shift key during startup. (See Kbase/TIL article #14343 for more information on possible Extension conflicts.
Troubleshooting Symptom/Cure Tables: Startup Problems Before the Finder This problem refers to a system that begins a normal startup process with a boot chime and normal display, but then freezes before the Finder appears. Possible Cause External device is bad. Possible Fix Disconnect all external devices (USB and Ethernet).
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 0 Symptom/Cure Tables: System Problems After Startup If you experience system problems after a successful startup (i.e., after the Finder appears on the screen), most likely the problem is not with the iMac hardware (with the exception of some possible RAM issues). Following are troubleshooting tables with problem symptoms that you may see after the Finder appears.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 1 System Hangs Refer to this table if your system intermittently hangs (freezes) during normal operation. Note: if your system only hangs when using a specific application, the problem is most likely with the application and not with your iMac hardware or system software.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 2 Distorted Video Distorted Video refers to a problem with the screen geometry or focus. Possible Cause Possible Fix System is out of focus. Adjust the focus using the Display Adjustment Utility on the MacTest Pro CD. (See “Focus” in the iMac Adjustments chapter for instructions.) Screen geometry is out of adjustment (display is off center, sides or top of the screen are not straight, etc.).
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 3 Thin White Line A a thin, white horizontal line scrolls from top to bottom, or bottom to top on the iMac display. Possible Cause Possible Fix Display may need adjusting. Adjust the cutoff or white balance using the Display Adjustment and Display Service Utilities on the MacTest Pro CD. (See “Video” in the iMac Adjustments chapter for instructions.) Power/analog/video board is faulty Replace the power/analog/video board.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 4 Tinting Video Tinting Video refers to a predominant color tint or color covering the screen. Possible Cause Possible Fix Environmental causes. Verify that the iMac unit is not near other equipment (such as speakers, radios, phones, fluorescent lighting, magnets, or other electronic equipment) that could affect the video display. If necessary, move the iMac computer to another area and restart the unit. Loose video cables.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 5 Garbage Video Garbage video refers to erroneous text or characters that appear on the screen. Possible Cause Possible Fix Corrupted system software. Boot from the system CD that came with the unit. Open the Monitors and Sound control panel and change the Maximum Resolution and Color Depth to their maximum settings. Restart the unit. Does the screen display appear normal now? Yes: Reinstall system software.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 6 Intermittent Shut Down or Sleep An iMac with a sticking power button can generate unpredictable behavior. The iMac randomly shuts itself off or puts itself to sleep. The iMac will not start up from either the front power button or the keyboard.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 7 Memory Error Dialog If you see a error dialog message pertaining to memory after you have a successful startup sequence (that is, a normal boot tone with no error beeps and proper video display, etc.) then refer to the table below to troubleshoot the problem. Possible Cause Dialog message reads “The built-in memory test has detected a problem. Please contact a service provider for assistance.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 8 Can’t Wake From Sleep The computer cannot be brought out of “sleep” mode by pressing a key on the keyboard. The problem is usually evident by a black screen and a pulsing amber LED. Possible Cause Possible Fix PMU Press the PMU chip on the logic board with the AC power cord disconnected. (See “The PMU Chip” and “Resetting the PMU on the Logic Board” mentioned earlier in this chapter.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 3 9 Network Problems Refer to this troubleshooting table if you are unable to switch to the Ethernet network option in the control panel or if you are unable to see any network devices. Note: if you are able to see most network devices, but one particular device does not show up in the Chooser, troubleshoot the device in question. You most likely do not have a network problem.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 0 CD_ROM or DVD-ROM Vibration CD-ROM or DVD-ROM vibration is typically caused by unbalanced discs when spinning at higher speeds in the internal CD-ROM or DVD-ROM drive. This vibration may cause the drive to have difficulty reading the disc. Possible Cause Bad CD-ROM or DVD-ROM disc. Possible Fix Try using a known-good compact disc.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 1 CD-ROM or DVD-ROM Won’t Eject CD-ROM or DVD-ROM disc won’t eject from the slot. Possible Cause Bad CD-ROM or DVD-ROM disc. Possible Fix 1 Press and hold down the mouse button on startup. Note: This only works on iMac computers with Boot ROM version 2.3 or higher. To check the Boot ROM version, open Apple System Profiler/System Profile tab/Production information/Boot ROM Version. 2 Try manually ejecting the disc.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 2 CD-ROM or DVD-ROM disc won’t eject from the slot. Possible Cause Uneven edge of the CD or DVD drive. Possible Fix There are two internal levers on a slot-loading CD-DVD drive that help center a CD-DVD disc. Some CDs and DVDs have and uneven edge which can cause enough friction to prevent the disc from ejecting.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 3 CD-ROM or DVD-ROM Not Showing on Desktop CD-ROM and DVD-ROM problems are defined by the inability to see the CD or DVD on the desktop or to open a CD or DVD that is loaded into the drive. Possible Cause Possible Fix Bad CD-ROM or DVD-ROM disc. Try using a known-good compact disc. CD-ROM or DVD-ROM disc didn’t load properly. Manually eject the disc and try again.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 4 Hard Drive Problems Hard drive problems include a hard drive that doesn’t operate (it doesn’t spin) or a hard drive that doesn’t mount (it doesn’t appear on the desktop). Possible Cause Possible Fix Corrupted drivers. Can you see the hard drive using Drive Setup? Yes: Use Drive Setup to reinstall the software drivers for the hard drive. If the problem persists, use Drive Setup to reinitialize the hard drive.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 5 Sound Out Problems Sound out problems refer to a lack of sound coming from the internal speakers (located on the front of the unit directly below the display), external speakers (connected via the I/O panel to the speaker connector on the logic board), or both. Possible Cause Possible Fix Control Panel setting is incorrect. First, disconnect any external microphones, speakers or headphones.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 6 Sound In Problems Sound in problems involve the internal microphone. Symptoms could be: audio recording quality is poor, a high level of background noise is noticeable, or no sound is recorded. Possible Cause Possible Fix Sound control panel. Open the Simple Sound Control Panel (found under the Apple Menu). Select CD Quality under the Sound menu to minimize noise on the internal microphone.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 7 Noise From Computer After Shutdown After the computer is shutdown, the computer emits a loud humming or buzzing noise that may continue for minutes or until the power cord is removed. Possible Cause Logic Board Possible Fix Replace the logic board.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 8 USB Problems USB problems refer to symptoms or issues that may occur with external USB devices that are attached to the iMac. This could include Apple and/or third-party USB devices. Possible Cause Possible Fix Not enough power for the USB device to function. The following error message will appear confirming that a device cannot function at all due to a lack of power.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 4 9 USB problems refer to symptoms or issues that may occur with external USB devices that are attached to the iMac. This could include Apple and/or third-party USB devices. Possible Cause Possible Fix USB driver missing. This error message indicates the device's driver is missing. Customers will need to check the instructions that came with the device and install the Mac OS driver. Bad USB connector.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 0 Cursor Problems This section deals with a cursor that moves on the screen, but clicking the mouse has no effect or double-clicking the mouse does not open an application, disk or server. Possible Cause Possible Fix Corrupted PRAM. Reset parameter RAM. Hold down
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 1 USB Printer Problems This troubleshooting table deals with an iMac that cannot print to an attached, knowngood USB printer. Possible Cause Possible Fix Printer is not compatible with the iMac USB bus. Verify with the manufacturer of the printer that it is iMac compatible. Chooser is set incorrectly. Open the Chooser and verify that you have the correct printer and printer driver selected.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 2 Networked Printer Problems This troubleshooting table deals with an iMac that cannot print to an attached, knowngood networked printer. Possible Cause Possible Fix Bad network connections. Check the network connections. Wrong version of system software is installed. Verify that you have the correct version of Mac OS. If you are unsure, reinstall the system software using the original CD that shipped with the iMac unit.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 3 Modem Not Recognized This table should help you troubleshoot and fix problems when the internal modem is not recognized. Follow the instructions under the “Possible Fix” column to resolve the problem. Possible Cause Possible Fix Modem Is Not Recognized: If the modem is not recognized or listed in the application or OS, refer to this section of the table. Needed extensions or CCL files are not installed or are corrupt.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 4 Modem Dialing Problems If the modem is having problems dialing out, refer to the table below for possible fixes. The table is divided into different sections, each with its own symptom and cure(s). Find your symptom and then follow the instructions under the “Possible Fix” column to resolve the problem.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 5 If the modem is having problems dialing out, refer to the table below for possible fixes. The table is divided into different sections, each with its own symptom and cure(s). Find your symptom and then follow the instructions under the “Possible Fix” column to resolve the problem. Note: A good first step in troubleshooting a modem problem is to verify the modem connection as explained in “Testing the Modem” earlier in this chapter.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 6 Modem Not Connecting This table should help you troubleshoot and fix a modem that is recognized and able to dial out, but is having trouble connecting. The table is divided into different sections, each with its own symptom and cure(s). Find your symptom and then follow the instructions under the “Possible Fix” column to resolve the problem.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 7 This table should help you troubleshoot and fix a modem that is recognized and able to dial out, but is having trouble connecting. The table is divided into different sections, each with its own symptom and cure(s). Find your symptom and then follow the instructions under the “Possible Fix” column to resolve the problem.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 8 Modem Dropping Connection This table should help you troubleshoot and fix a modem that is dropping its connection once it is established. The table is divided into different sections, each with its own symptom and cure(s). Find your symptom and then follow the instructions under the “Possible Fix” column to resolve the problem.
Troubleshooting Symptom/Cure Tables: System Problems After Startup - 5 9 Modem Performance Issues This table should help you troubleshoot issues with the speed or response time of the modem. The table is divided into different sections, each with its own symptom and cure(s). Find your symptom and then follow the instructions under the “Possible Fix” column to resolve the problem.
K Service Source Upgrades iMac (Summer 2001) Note: The parenthetical product description (Summer 2001) refers to the summer of the Northern Hemisphere.
Upgrades - 2 Memory Install a memory module that meets the following specifications: • JEDEC PC-100 DIMM • 64, 128, 256, or 512 MB • 168-pin • 125 MHz (8 ns) or faster
Upgrades - 3 Note: Place a soft towel or cloth on the desk or surface. Position the screen face down on the cloth. 1. Using a flatblade screwdriver or a coin, turn the latch counterclockwise to open the rear access door. 2. Lower the access door.
Upgrades - 4 3. Touch the EMI cover that is visible inside the recessed latch area before touching any components on the main logic board. This protects the computer from damage caused by electostatic discharge .Important: If necessary, remove any existing memory module.
Upgrades - 5 4. Push the ejector tabs on the slots outward and down so they are in the open position.
Upgrades - 6 5. Align the notches on the memory module with the small notches inside the slot. 6. Push down on the DIMM until it snaps into place. The ejectors will automatically close. 7. Close the rear access door and test the computer before returning it to the customer.
Upgrades - 7 AirPort Card Place a soft towel or cloth on the desk or surface. 1. Position the screen face down on the cloth.Use a coin or flatblade screwdriver to turn the latch counterclockwise on the access door. 2. Lower the access door to open.
Upgrades - 8 3. Touch the metal EMI shield inside the recessed latch area before touching any components on the main logic board.
Upgrades - 9 Guide Rails Antenna Protective Antenna Cap 4. Detach the antenna from the left guide rail. 5. Remove the protective antenna cap from the end of the antenna and store the cap in a safe place.
Upgrades - 10 6. Slide the AirPort Card into the adapter card. Note: It is probably easiest to attach the metal ground clip over the AirPort Card once the card is installed into the Adapter Card. This photo shows the ground clip already in place.
Upgrades - 11 7. Connect the antenna by plugging the antenna wire into the small hole in the end of the AirPort Card.
Upgrades AirPort Adapter Card Connector - 12 AirPort Card AirPort Adapter Ca Guide Rails for AirPort Card/ AirPort Adapter Card 8. Align the edges of the AirPort Card with the guides on the AirPort Card slot. Insert the AirPort Card into the adapter Card connector. 9. Close the access door, test the computer before returning it to the customer.
Upgrades - 13 Connect an External Monitor The iMac (Early 2001) computers have a VGA output port for an external video monitor. The external monitor shows the same information as the built-in display, a mode sometimes called hardware video mirroring.
Upgrades - 14 10. Place the computer face down, on a soft, clean cloth or ESD mat.
Upgrades - 15 VGA Output Port 11. Plug the external monitor cable into the VGA output port on the back of the computer. VGA Vented Cover 12. Plug the monitor cable into the monitor port on the external monitor. External Monitor Cable 13. Plug the power cord in and press the Power button on the computer to turn it on. 14. Press the Power button on the external monitor to turn it on.
Upgrades - 16
K Service Source Adjustments iMac (Summer 2001) Note: The parenthetical product description (Summer 2001) refers to the summer of the Northern Hemisphere.
Adjustments - 2 Important: Adjustment Information The Adjustment procedures for iMac (Summer 2001) computer are identical to the procedures for the slot loading iMac (Summer 2000) and the iMac (Early 2001) computers. These procedures can also be found in the Knowledge Base. Refer to article 95121: iMac: Adjustment Procedures.
Adjustments Adjustment Tools - 3 Adjustment Tools The following items are needed to perform video adjustments: • Display Adjustment Utility • jumper adjustment tool (922-4165) • light meter Model R77 The utility can be found online at: http:// service.info.apple.com. Select Troubleshoot and Repair/Reference/Safety.
Adjustments Adjustment Tools - 4 Light Meter Setup This topic covers setup for light meter Model R77, service part number 0760310. Note: The adjustments were optimized for light meter Model R77. To obtain more consistent color results, use only the R77 light meter when performing color adjustments on the slot-load iMac.
Adjustments Adjustment Tools - 5 Model R77 Before you begin, remove the 10X multiplier plate from the lens. Three scales are shown on the light meter: • 200-1000 fc • 50-250 fc • 10-50 fcT Because display screen luminance typically ranges from 10 to 50 fc, take readings from the bottom scale only.
Adjustments Adjustment Tools - 6 To measure a display screen’s luminance, 1. Set the scale switch to the bottom position (to set up the 10-50 fc scale). 2. Place the lens against the middle of the screen and read the bottom scale. Note: When the light meter is not in use, slide the scale switch to its top position, and store the meter in its protective case.
Adjustments Adjustment Tools - 7 If you suspect the light meter is giving false readings, verify the readings with a known-good light meter or photometer. Also check the age of the R77 light meter by its four-digit manufacturing date stamp (such as 0398 for March 1998). Caution: Dropping the meter can permanently damage its accuracy. A shock-damaged meter might read incorrectly or its pointer may not drop to zero.
Adjustments Adjustment Tools - 8 Jumper Adjustment Tool The jumper adjustment tool (922-4165) must be installed to save cutoff and white balance adjustments to the factory space.
Adjustments Adjustment Tools - 9 Installing the Jumper ±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review the Safety information online at: http:// service.info.apple.com. Select Troubleshoot and Repair, and click on Safety under the Tools list. 1. Remove the bottom housing and the top rear housing to access the video board.
Adjustments Adjustment Tools - 1 0 2. With the power off, remove the left ground cable from the video board.
Adjustments Adjustment Tools - 1 1 3. Connect one end of the jumper adjustment tool (922-4165) to the video board pin. Note: The video board pin is located approximately one inch below the ground pin and is accessible through a small hole in the video board sheet metal 4. Connect the other end to one of the ground pins. 5. Power on the iMac and begin the adjustments.
Adjustments Focus Adjustment - 1 2 Focus Adjustment ±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review the Safety information online at: http:// service.info.apple.com. Select Troubleshoot and Repair, and click on Safety under the Tools list.
Adjustments Focus Adjustment - 1 3 flyback transformer. Note: Make sure the jumper adjustment tool is installed (see previous procedure). 2. Power on the iMac. 3. Open the Display Adjustment Utility and select the Focus test pattern from the Pattern menu.
Adjustments Focus Adjustment - 1 4 4. Adjust the focus control on the flyback transformer until the focus test pattern reaches the best frontof-screen performance.
Adjustments Screen Voltage - 1 5 Screen Voltage ±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review the Safety information online at: http:/ /service.info.apple.com. Select Troubleshoot and Repair and click on Safety under the Tools list.
Adjustments Screen Voltage - 1 6 1. Remove the bottom housing and the top rear housing to access the flyback transformer that contains the screen voltage potentiometer.
Adjustments Screen Voltage - 1 7 2. With the power off, remove the left ground cable from the video board.
Adjustments Screen Voltage - 1 8 3. Connect the jumper adjustment tool (9224165) to the video board pin. Refer to the “Jumper Adjustment Tool” procedure mentioned earlier in this section. Note: Without the jumper installed, cutoff and white balance adjustments cannot be saved. The jumper enables writing the new settings to the factory space. 4. Power on the iMac.
Adjustments Screen Voltage - 1 9 5. Open the Display Adjustment Utility and select the Color tab. 6. Set the Contrast to maximum and the Brightness to midrange. 7. Set the resolution to 800 x 600 in the Monitors control panel.
Adjustments Screen Voltage - 2 0 8. Select the Gray Bars test pattern from the Pattern menu.
Adjustments Screen Voltage - 2 1 9. Looking at the Gray Bar test pattern, turn the screen voltage knob on the flyback transformer until: • the first bar is black • the second bar is barely visible • the third bar is a dark gray Note: The surrounding raster should also be black. 10. When the requirements in step 9 are met, the screen voltage is set correctly. Proceed to the cutoff adjustment.
Adjustments Cutoff Adjustment - 2 2 Cutoff Adjustment ±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review the Safety information online at http:/ /service.info.apple.com. Select Troubleshoot and Repair and click on Safety under the Tools list.
Adjustments Cutoff Adjustment - 2 3 • prior to the white balance adjustment • in a dimly lit room
Adjustments Cutoff Adjustment - 2 4 Note: Set the Screen Voltage if you haven’t done so already. Refer to “Screen Voltage ” mentioned earlier in this section. 1. Remove the bottom housing and the top rear housing to access the video board. 2. With the power off, remove the left ground cable from the video board.
Adjustments Cutoff Adjustment - 2 5 3. Connect the jumper adjustment tool (see graphic). Refer to “Jumper Adjustment Tool” mentioned earlier in this section. 4. Power on the computer. Make sure the monitor has been on for at least 10 minutes before making adjustments.
Adjustments Cutoff Adjustment - 2 6 5. Open the Display Adjustment Utility and select the Color tab. 6. Set the drive and cutoff controls to their midpoint positions. Note: The Revert and Save buttons are normally dimmed until a slider bar is moved. If you need to return to the previous color setting, either select “Color Revert” from the File menu or press the keys.
Adjustments Cutoff Adjustment - 2 7 used if all the color drive controls are set to zero, and the screen is completely black. The Command-R function has the same function as Color Revert (from the File menu) and the Revert button on the Color tab window.
Adjustments Cutoff Adjustment - 2 8 7. Select the Gray Bars test pattern from the Pattern menu. 8. Look at the Gray Bar Test pattern. • The bars should have no predominant color. • The leftmost bar should be black. • The second bar from the left should be barely visible. • The third bar should be dark gray.
Adjustments Cutoff Adjustment - 2 9 9. Select the Color tab window. 10. Adjust the red, green, and blue cutoff controls until the second bar (from the left) on the Gray Bars test pattern is barely visible and there is no predominant color.
Adjustments Cutoff Adjustment - 3 0 11. If there is a predominant color in the three bars on the left, continue adjusting the color controls accordingly until there is no predominant color. When you are finished, you should see shades ranging from black and white. Note: Depending on the monitor resolution selected, the number of gray bars displayed will vary.
Adjustments Cutoff Adjustment - 3 1 12. Click the Save button to save your adjustments. 13. Proceed to the white balance adjustment.
Adjustments White Balance - 3 2 White Balance Before you begin, make sure the: • cutoff is set correctly • monitor has been on for at least 10 minutes. • jumper adjustment tool is connected to the video board (refer to “Jumper Adjustment Tool” mentioned earlier in this section).
Adjustments White Balance - 3 3 1. Open the Display Service Utility and select the Gray Bars test pattern from the Pattern menu.
Adjustments White Balance - 3 4 2. Adjust the red, green, and blue drive controls until there is no predominant color.
Adjustments White Balance - 3 5 3. Select “White” from the Pattern menu to display the all-white test pattern. 4. Hold the light meter against the center of the all-white screen. The screen luminance reading should be 33± 5fc (foot candles) on the light meter Model R77. If the luminance readings are not within spec, verify the meter is functioning correctly.
Adjustments White Balance - 3 6 5. Click the Save button to save your settings. 6. Restart the computer and reset the parameter RAM (PRAM) to apply the newly saved cutoff and white balance adjustments to the Factory Setting. To reset the PRAM, hold down the
Adjustments White Balance - 3 7 Note: If you don’t restart the computer, the iMac will display the last settings made on the iMac. 7. Open the Monitors control panel. 8. Select the Geometry icon.
Adjustments White Balance - 3 8 9. Click the Factory Settings button.
Adjustments Geometry Adjustments - 3 9 Geometry Adjustments Before you begin, connect the jumper adjustment tool to the video board (refer to the “Jumper Adjustment Tool” mentioned earlier in this section. Note: Without the jumper installed, geometry settings cannot be saved. The jumper enables writing the new settings to the factory space.
Adjustments Geometry Adjustments - 4 0 1. Open the Display Adjustment Utility 2. Select the Geometry tab.
Adjustments Geometry Adjustments - 4 1 3. Select a resolution for adjustment from the Resolution menu. Note: Don’t use the control strip or Monitors control panel to set the resolution.
Adjustments Geometry Adjustments - 4 2 4. Adjust the geometry settings by moving the appropriate slider bar. 5. Click the Save button to save the adjustments for that resolution. Note: Repeat steps 2-4 (for each resolution) when adjusting width, height, horizontal, vertical, keystone, and pincushion. 6. Restart the computer and reset the parameter RAM to save geometry adjustments to the Factory memory setting.
Adjustments Geometry Adjustments - 4 3 7. To reset the PRAM, hold down the
Adjustments Geometry Adjustments - 4 4 10. Click on the Factory Settings button in the Geometry window. 11. Close the Monitor control panel. Note: Rotation, Parallelogram, Pincushion Balance, and S Correction adjustments are resolution independent. Adjusting at one resolution will apply to all resolutions. Simply make the changes and click the Save button.
Adjustments S Correction Adjustment - 4 5 S Correction Adjustment 1. Open the Display Adjustment Utility and select “White Grid” from the Pattern menu. 2. Check that all the squares on the White Grid test pattern appear equal in size. If the squares look fine, there is no need for this adjustment. If the squares don’t look equal in size, go on to the next step.
Adjustments S Correction Adjustment - 4 6 3. Open the Display Adjustment Utility, and select the Geometry tab. 4. If the squares need adjusting, move the S Correction slider bar. 5. Select the White Grid test pattern again from the Pattern menu and check that all the squares on the White Grid test pattern appear equal in size. If the squares need further adjusting, repeat steps 4 -5.
Adjustments S Correction Adjustment - 4 7 6. When all the squares look uniform on the S Correction test pattern, go back to the Geometry tab window and click the Save button. 7. Restart the computer and reset the parameter RAM (PRAM) to save these adjustments to the Factory Setting. To reset the PRAM, hold down the
Adjustments S Correction Adjustment - 4 8 Note: If you don’t restart the computer, the iMac will display the last settings made on the iMac. 8. Open the Monitors control panel. 9. Select the Geometry icon.
Adjustments S Correction Adjustment - 4 9 10. Click on the Factory Settings button in the Geometry window. Note: Before returning the iMac to the customer, display the focus test pattern again and verify that the focus is acceptable after all of the adjustments have been completed.
Service Source Exploded View iMac (Summer 2001) Note: The parenthetical product description (Summer 2001) refers to the summer of the Northern Hemisphere.
Exploded View 2 iMac (Summer 2001) Exploded View Screw Cap Top Right 922-4143 Screw CapTop Left 922-4142 Top Rear Housing CRT Assembly (N. Hem.
Exploded View 3 iMac (Summer 2001) Cable Locator
Exploded View 4 iMac (Summer 2001) Screw Matrix
Exploded View 5 iMac (Summer 2001) Colored Service Parts Top Rear Housing 922-4245 Graphite, Ver. 2 922-4247 Indigo 922-4246 Snow Front Outer Bezel 922-4251 Graphite 922-4253 Indigo 922-4609 Snow, Rev.
Exploded View 6 Power/Analog/Video Boards There are two part numbers for the power/analog/video board for the iMac (Summer 2001) computer because there are two vendors manufacturing the boards. The part numbers are 661-2465, Ver. 2, HH and 661-2466, Ver. 2, LG. These boards must be exchanged like-for-like. The 661-2465 board has a switch at location SW901 that must be set for the type of CRT tube in the computer. The switch settings are silk-screened on the board near SW901.
Exploded View 7
