K Service Source Apple Multiple Scan 15 AV Display
K Service Source Basics Apple Multiple Scan 15AV Display
Basics Overview - 1 Overview The Apple Multiple Scan 15AV Display is a 15-inch (13.75-inch viewable image size) color monitor that supports a variety of resolutions and that features a built-in amplifier and front-facing stereo speakers.
Basics Overview - 2 Monitor Features Features of the Apple Multiple Scan 15AV Display include the following: • Antistatic, antiglare screen surface • Multiple screen resolutions ranging from 640x480 to 1024x768 • Front-facing, CD-quality speakers • Easy-access front headphone jack • Support for Mac OS and Windows 95 • Compatible with Apple ColorSync software for the closest possible color match between what is seen on the monitor and what is printed or scanned
K Service Source Specifications Apple Multiple Scan 15AV Display
Specifications Characteristics - 1 Characteristics Picture Tube Phosphor 15-in. CRT (13.75-in. diagonal viewable image size) Raster Size: 10.6 in. x 7.9 in. (270 mm x 200 mm) Multiple scan Antistatic, antiglare surface treatment Dot Pitch: 0.28 mm White Point: 9300° K Shipping Brightness: 25 foot Lamberts (± 5 fL) Aluminized P22 (red, green, blue) Phosphor CIE Coordinates: Red x = 0.610 ± 0.020 y = 0.342 ± 0.020 Green x = 0.298 ± 0.020 y = 0.588 ± 0.020 Blue x = 0.151 ± 0.015 y = 0.064 ± 0.
Specifications Characteristics - 2 Screen Resolution Macintosh PC-Compatibles 640x480 at 60 Hz in VGA mode 640x480 at 67 Hz in Macintosh mode 800x600 at 60 Hz in SVGA mode 800x600 at 72 Hz in SVGA mode 832x624 at 75 Hz in Macintosh mode 1024x768 at 60 Hz in Macintosh mode 1024x768 at 70 Hz in Macintosh mode 1024x768 at 75 Hz in Macintosh mode 640x480 at 60 Hz in VGA mode 800x600 at 60 Hz in SVGA mode 800x600 at 72 Hz in SVGA mode 1024x768 at 60 Hz in SVGA mode 1024x768 at 70 Hz in SVGA mode 1024x768 at
Specifications Characteristics - 3 Cable Connector 15-pin miniature D-type Input Signals Red, green, and blue signals; separate sync Audio Response: 50 Hz to 20,000 Hz Output: 2 W SPL: 82 db @ 1 kHz, 1 meter
Specifications System Requirements Characteristics - 4 Power Macintosh, Macintosh Centris, Macintosh Quadra, some Macintosh Performas, or any NuBus compatible Macintosh with a Macintosh Display Card 24AC. Macintosh II family, PowerBooks, Duo and Mini Dock, some Macintosh Performa, Macintosh LC, LC II, LC III, and Macintosh computers with Display Cards 4•8, 8•24, or 8•24GC installed work in 640x480 mode. Other modes possible with additional adapters. System software version 7.
Specifications Monitor Timings Characteristics - 5 640x480 Resolution @ 60 Hz 640x480 Resolution @ 67 Hz Horizontal Timing Back Porch: 48 dots H SYNC: 96 dots Front Porch: 16 dots 1 dot: 39.72 ns 1 H: 31.77 µs 1/dot: 25.175 MHz Horizontal Timing Back Porch: 96 dots H SYNC: 64 dots Front Porch: 64 dots 1 dot: 33.06878 ns 1 H: 28.5714 µs 1/dot: 30.24 MHz Vertical Timing Back Porch: 33 H V SYNC: 2 H Front Porch: 10 H 1/H: 31.5 kHz 1 V: 16.
Specifications Monitor Timings Characteristics - 6 800x600 Resolution @ 60 Hz 800x600 Resolution @ 72 Hz Horizontal Timing Back Porch: 88 dots H SYNC: 128 dots Front Porch: 40 dots 1 dot: 25.0 ns 1 H: 26.4 µs 1/dot: 40.0 MHz Horizontal Timing Back Porch: 64 dots H SYNC: 120 dots Front Porch: 56 dots 1 dot: 20.0 ns 1 H: 20.800 µs 1/dot: 50.0 MHz Vertical Timing Back Porch: 23 H V SYNC: 4 H Front Porch: 1 H 1 H: 37.879 µs 1/H: 16.58 kHz 1 V: 16.
Specifications Monitor Timings Characteristics - 7 832x624 Resolution @ 75 Hz 1024x768 Resolution @ 75 Hz Horizontal Timing 1/H: 49.7 kHz Back Porch: 224 dots H SYNC: 64 dots Front Porch: 32 dots 1 H: 20.1 µs 1/dot: 57.28 MHz Horizontal Timing Back Porch: 160 dots H SYNC: 136 dots Front Porch: 24 dots 1 dot: 15.385 ns 1 H: 20.677 µs 1/dot: 65.0 MHz Vertical Timing Back Porch: 38 H V SYNC: 3 H Front Porch: 2 H 1 V: 13.41 ms Vertical Timing Back Porch: 29 H V SYNC: 6 H Front Porch: 3 H 1/H: 48.
Specifications Controls and Ports - 8 Controls and Ports User Controls I/O Ports Front Panel: power, select, up, down, recall, brightness, contrast, sound volume Additional picture controls available using the select button: horizontal and vertical shift, horizontal and vertical size Automatic degauss at power-on; manual degauss by turning power switch off, then on (capable of full degauss after monitor is turned off for 20 minutes or more) Headphone/Speaker: one input port and one pass-through output p
Specifications Physical and Electrical - 9 Physical and Electrical Power Supply Input Frequency Range Size and Weight Monitor Stand Voltage: 100–240 VAC Frequency: 50–60 Hz Power: 75 W maximum; 8 W sleep mode Horizontal: 30 kHz to 60.2 kHz Vertical: 56 Hz to 75 Hz Height: 14.93 in. (383 mm ± 5 mm) Width: 17.3 in. (443 mm ± 5 mm) Depth: 15.4 in. (395 mm ± 5 mm) Weight: 31 lb.
Specifications Environmental - 10 Environmental Temperature Operating: 50°F to 104°F (10°C to 40°C) Shipping: –4°F to +151°F (–40°C to +65°C) Storage: 32°F to 140°F (0°C to 60°C) Humidity 20% to 95% (noncondensing) over the range of 77°F to 104°F (25°C to 40°C) Altitude Operating: 0 to 10,000 ft. (0 to 3,048 m) Transit: 0 to 15,000 ft.
K Service Source Troubleshooting Apple Multiple Scan 15AV Display
Troubleshooting General - 1 General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Because cures are listed on the charts in the order of most likely solution, try the first cure first. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. ( Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.
Troubleshooting First Checklist/ - 2 First Checklist Important: Many Apple Multiple Scan 15AV display modules returned for repair are found to be fully operational. Read this checklist before you return a module, and prevent needless module replacement and unnecessary time delays. The Apple Multiple Scan 15AV Display is not compatible with all computers. This display works with both Macintosh and IBM PC-compatible computers. A video card may need to be installed to use this display with some computers.
Troubleshooting First Checklist - 3 A maladjusted screen can mimic the symptoms of main deflection board or CRT failures. By performing the adjustment procedures, you might determine if one or more of the adjustments is the cause of the problem. CRTs rarely fail. Needless CRT replacement can be prevented by checking display adjustments, checking the possibility of other defective modules, and accepting small imperfections in screen display.
Troubleshooting Symptom Charts/No Raster - 4 Symptom Charts No Raster No raster (screen is black); power indicator light on 1 2 3 4 5 No raster; power indicator light off 1 2 Ensure that the display is connected to a known-good video source. Adjust the front panel brightness and contrast controls. Check the monitor’s video cable for breakage or damage. Perform a continuity check to ensure that the video cable is not at fault.
Troubleshooting Symptom Charts/Video (Continued) - 5 Video (Continued) Areas of the screen have blotches of color 1 2 3 Screen is too bright; adjusting Brightness control does not lower intensity 1 2 3 4 Since this type of problem (purity) is often caused by magnetic fields in the area, place unit in another location to see if symptom disappears, changes in its intensity, or changes location on the screen. Turn off the monitor power switch, wait five minutes, then turn it back on.
Troubleshooting Symptom Charts/Geometry - 6 Geometry Raster not centered 1 2 Adjust either or both horizontal center and vertical center controls. See “Geometry” in the Adjustments chapter. Adjust the horizontal center switch (SW701 on version G only). See “Horizontal Centering” in the Adjustments chapter. Size of the horizontal and/or vertical raster is incorrect Use the appropriate size controls to set the vertical height to 200 mm (7.9 inches) and the horizontal width to 270 mm (10.6 inches).
Troubleshooting Symptom Charts/Sound Problems - 7 Sound Problems Distorted or no sound coming through one speaker Disconnect the wires to both speakers. Using jumper cables, connect the right speaker wire to the left speaker and the left speaker wire to the right speaker. This will isolate the problem to a defective speaker or a defective main deflection board.
K Service Source Take Apart Apple Multiple Scan 15AV Display
Take Apart Safety Guidelines for Taking Apart the Apple Multiple Scan 15AV Safety Guidelines for Taking Apart the Apple Multiple Scan 15AV Display ±Warning: This product contains high voltage and a highvacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. Never use a grounding wriststrap until after discharging the CRT and setting up an ongoing ground connection.
Take Apart Control Panel Door - 2 Control Panel Door No preliminary steps are required before you begin this procedure.
Take Apart Control Panel Door - 3 1 2 Position the monitor close to the edge of a table and so that the screen faces you. Press down on the center of the door so it flips open.
Take Apart Control Panel Door - 4 3 Grasp each side of the door and pull the door down to release it from its hinges. Replacement Note: Position the door under the bezel so the hinges line up with the bezel contacts. Push the door onto the bezel until it snaps into place.
Take Apart Tilt-Swivel Stand - 5 Tilt-Swivel Stand Before you begin, remove the control panel door. Note: Because this procedure requires you to place the monitor face down, you need to remove the control panel door to prevent damaging it.
Take Apart Tilt-Swivel Stand - 6 1 2 Tab Tilt-Swivel Stand Tab Place the monitor facedown on a padded surface with the bottom of the stand facing you. Press inward on both tabs on the sides of the stand.
Take Apart Tilt-Swivel Stand - 7 3 Hook Tilt-Swivel Stand Hook Tilt the stand upward and off the bottom housing. Replacement Note: With the monitor face down, insert the two hooks on the back of the tilt-swivel stand into the two slots on the bottom housing. Push the stand onto the housing until its tabs snap into place.
Take Apart Rear Housing - 8 Rear Housing Rear Housing Before you begin, remove • Control panel door • Tilt-swivel stand This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter.
Take Apart Rear Housing - 9 1 2 Screws Place the monitor facedown on a padded surface. Remove the four Phillips screws (two on each side).
Take Apart Rear Housing - 10 3 Rear Housing Video Cable Lift the rear housing straight off the CRT assembly and route the video cable through the opening in the rear housing.
Take Apart Speaker - 11 Speaker Speakers Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter.
Take Apart Speaker - 12 1 Speaker Connectors Locate the inoperative speaker and disconnect the speaker connector near the display’s bottom corner, either • Red speaker connector on the right • White speaker connector on the left
Take Apart Speaker - 13 2 Routing Channel Speaker Wire Remove the speaker wire from its routing channel.
Take Apart Speaker - 14 3 Screwdriver Foam Gasket Speaker 4 Use a flat-blade screwdriver to pry off the speaker and its foam gasket from the bezel. Lift the speaker from the inside bezel. Replacement Note: When replacing a speaker, verify that the bezel is clean, peel off the foam gasket’s adhesive backing, and apply the speaker to the bezel. The speakers are fully interchangeable, so you can replace a speaker on either side of the bezel.
Take Apart Speaker Grilles - 15 Speaker Grilles Speaker Grille Speaker Grille Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter.
Take Apart Speaker Grilles - 16 1 Bezel Screw Screw Remove the two recessed screws at the top and bottom of the inner bezel sides. Caution: Do not remove the CRT corner screws.
Take Apart Speaker Grilles - 17 2 Screwdriver Bezel Speaker Grille Insert a small flatblade screwdriver between the outside speaker grille and bezel. Pry off the grille in four places to release the four side tabs.
Take Apart Speaker Grilles - 18 3 Hook 4 Gently tilt the speaker grille toward the display face to release it from the bezel hooks. Repeat steps 1 through 3 for the other speaker grille. Replacement Note: The left and right speaker grilles come as a pair and are not interchangeable.
Take Apart Sound In Board - 19 Sound In Board Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter.
Take Apart Sound In Board - 20 1 2 Screw Sound In Board Screw P156 Remove • Two screws • P156 connector Lift the board off the metal bracket.
Take Apart CRT/Video Board CRT/Video Board - 21 CRT/Video Board Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter.
Take Apart Ground Cable CRT/Video Board - 22 CRT Shield Ground Cable Caution: When disconnecting cables from the CRT/video board, be careful not to apply excessive pressure on the neck of the CRT. 1 Disconnect the two braided CRT ground cables located on both sides of the CRT shield.
Take Apart CRT/Video Board - 23 2 Two-Wire Connector Braided Cable at E2 From the side of the CRT assembly, disconnect • Two-wire connector behind CRT/video board • Braided cable at E2 to the right of the flyback transformer on the main deflection board
Take Apart CRT/Video Board - 24 3 Screw Screw From the back of the CRT assembly, remove • Phillips screw that connects the braided cable to the sound in board • Phillips screw that attaches the braided cable to the back panel flange
Take Apart CRT/Video Board - 25 Red Wire at P304 Two-Wire Connector at P305 4 From the side of the CRT assembly, disconnect • Red wire with the gray connector on the CRT/video board at P304 • Black two-wire connector on the CRT/ video board at P305
Take Apart CRT/Video Board - 26 5 Neck 6 CRT/Video Board Caution: Twisting, bending, or applying force to the CRT/video board could damage the neck of the CRT. With a gentle side-toside motion, ease the CRT/video board off the neck of the CRT until it clears the neck pins. With some wires still attached, set the CRT/ video board on the table.
Take Apart CRT/Video Board - 27 P301 7 8 Screw P302 Using a Phillips screwdriver, remove the screw holding the braided cable to the back panel flange.
Take Apart CRT/Video Board - 28 Lock Screwdriver CRT Socket 9 Use a flat-blade jeweler’s screwdriver to gently pry up the wire lock (about one to two millimeters) from the CRT socket base.
Take Apart CRT/Video Board - 29 10 Using needlenose pliers, firmly grasp the lock and twist it in a clockwise direction (about one-eighth of a turn) while pulling the lock straight up.
Take Apart CRT/Video Board - 30 Lock CRT Socket 11 Pull the wire lock and wire from the CRT socket. Because the lock fits loosely over the wire, slightly bend the wire so the lock cannot slide off. Replacement Note: Before securing the lock inside the CRT socket, ensure the end of the wire is straight. With the lock attached, push the wire straight down as far as it will go. Then secure the lock in the socket with a counterclockwise turn.
Take Apart Screw CRT/Video Board - 31 Shield Screw Replacement Note: Before returning a CRT/video board for replacement, remove and retain the shield so you can attach it to the replacement board. Remove the two Phillips screws that secure the shield onto the CRT/video board.
Take Apart Video Cable - 32 Video Cable Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter.
Take Apart Video Cable - 33 Ground Cable Ground Cable Caution: Twisting, bending, or applying force to the CRT/video board could damage the neck of the CRT. 1 2 Two-Wire Connector CRT/Video Board Two-Wire Connector Disconnect • Two braided CRT ground cables from the CRT shield • Two two-wire connectors from the CRT/video board With a gentle side-toside motion, ease the CRT/video board off the neck of the CRT until it clears the neck pins.
Take Apart Video Cable - 34 Ground Screw Cable Clip Screw 3 4 With some wires still attached, move the CRT/ video board so that you can reach the back panel screws.
Take Apart Video Cable - 35 5 P301 E3 Disconnect • Connector P301 • Pin E3
Take Apart Video Cable - 36 6 7 8 Disconnect P401 from the center of the main deflection board. Cut the tie wrap that holds the P401 cable. Remove the cable from the cable clamp. Replacement Note: Secure the P401 cable by routing it through the cable clamp and using a new wire tie wrap.
Take Apart Video Cable - 37 9 Video Cable Hook Strain Relief Hook At the video cable strain relief, press the two hooks forward and pull up on the video cable strain relief to release it from the slot.
Take Apart Main Deflection Board - 38 Main Deflection Board Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT and disconnect the anode cap • Remove the CRT/video board Main Deflection Board
Take Apart Main Deflection Board - 39 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter. ±Warning: 1 Screw Remove the Phillips screw from the chassis bracket (next to the bottom right CRT corner screw).
Take Apart Main Deflection Board - 40 2 Ground Pin Speaker Connector Disconnect • Speaker connector • Ground pin
Take Apart Main Deflection Board - 41 3 P701 Disconnect the CRT yoke wire at P701.
Take Apart Main Deflection Board - 42 4 Speaker Connector P902 Disconnect • Speaker connector • Degaussing coil at P902
Take Apart Main Deflection Board - 43 5 6 Bottom Housing Screw Screw Place the monitor facedown on a padded surface. Remove the two Phillips screws from the bottom housing.
Take Apart Main Deflection Board - 44 7 Chassis 8 Screwdriver Tab Tab While grasping the end of the main deflection board chassis with one hand, use a flat-blade screwdriver to press in on one of the two tabs on the bottom of the bezel assembly. Press in on the other tab, and slide the main deflection board straight up and off of the CRT assembly.
Take Apart Main Deflection Board - 45 are attached to the main deflection board chassis. Replacement Note: With the control panel board secured to the replacement main deflection board, align the side edges of the main deflection board with the two slide rails on the bottom housing. Slide Rails Bottom Housing Slide Rails Ensure no cables get pinched as you slide the board into place. With the board in place, be sure to reconnect all cables including the anode cap.
Take Apart Control Panel Board - 46 Control Panel Board Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT • Remove the CRT/video board • Remove the main deflection board This product contains high voltage and a high-vacuum picture tube.
Take Apart Control Panel Board - 47 To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter. 1 Screw Remove the Phillips screw.
Take Apart Control Panel Board - 48 2 Holder Slightly tilt the control panel board forward, and slide it out of the plastic holder.
Take Apart Control Panel Board - 49 3 Disconnect the following four connectors: • P152 • P153 • P154 • P155 Replacement Note: Remove and retain the three knobs from the control panel board so you can attach them to the replacement board.
Take Apart Power Switch - 50 Power Switch Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT • Remove the CRT/video board • Remove the main deflection board This product contains high voltage and a high-vacuum picture tube.
Take Apart Power Switch - 51 Bottom Housing review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter. 1 Place the monitor face down on a padded surface so the bottom housing faces you.
Take Apart Power Switch - 52 2 Lock Bezel Locate the power switch lock inside the bezel.
Take Apart Power Switch - 53 3 Tab Lock Use needlenose pliers to grasp the lower tab of the power switch lock. Pull up the lock as far as it will go.
Take Apart Power Switch - 54 4 Slot Side Tab Needlenose Pliers Tab Needlenose Pliers While holding the lock tab up, use a second pair of needlenose pliers to pinch the two side tabs so that they fit through the slot in the lock. Repeat for the other side tabs.
Take Apart Power Switch - 55 5 Power Switch Spring Lock Pull the lock off of the power switch and spring.
Take Apart Power Switch - 56 6 Tilt up the CRT assembly to pull out the power switch and spring from the front side of the bezel. The power switch assembly consists of the three pieces shown here.
Take Apart Front Bezel - 57 Front Bezel Before you begin, • Remove the control panel door • Remove the tilt-swivel stand • Remove the rear housing • Discharge the CRT • Remove the CRT/video board • Remove the main deflection board • Remove the speakers • Remove the power switch Front Bezel
Take Apart Front Bezel - 58 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter. ±Warning: Bottom Housing 1 Place the monitor face down on a padded surface so the bottom housing faces you.
Take Apart Front Bezel - 59 2 Screw Screw Using a Phillips screwdriver, remove the four CRT corner screws and washers (two on each side).
Take Apart Front Bezel - 60 3 CRT Front Bezel Using both hands, lift the CRT off of the front bezel.
K Service Source Adjustments Apple Multiple Scan 15AV Display
Adjustments Power Supply Voltage - 1 Power Supply Voltage Before you begin, refer to the Take Apart chapter to remove the rear housing. Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± Note: Perform the power supply voltage adjustment whenever the main deflection board is replaced.
Adjustments Power Supply Voltage - 2 1 2 3 Turn on the display and let it warm up for five minutes. Using the control strip, set the screen resolution to 640x480. Using the Display Service Utility, select the crosshatch display pattern with the black background from the Standard Patterns screen.
Adjustments Power Supply Voltage - 3 4 J5 Locate jumper wire J5 on the left side of the main deflection board.
Adjustments Positive Probe at J5 Voltmeter Power Supply Voltage - 4 Ground Probe at Chassis 5 Connect the positive probe (red wire) of a digital voltmeter to jumper J5 and connect the ground probe (black wire) to the metal chassis.
Adjustments Power Supply Voltage - 5 6 Positive Probe at J5 VR951 While maintaining the voltmeter probe connections, use a plastic screwdriver to adjust VR951 until the voltmeter reads 50 VDC ± 0.2V.
Adjustments High Voltage - 6 High Voltage Before you begin, refer to the Take Apart chapter to remove the rear housing. Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± Note: Perform the highvoltage adjustment whenever the main deflection board is replaced.
Adjustments High Voltage - 7 1 2 3 Turn on the display and let it warm up for five minutes. Using the control strip, set the screen resolution to 640x480. Using the Display Service Utility, select the crosshatch display pattern with the black background.
Adjustments High Voltage - 8 Cathode 4 Locate diode D713 between the flyback transformer and large heatsink on the main deflection board. Notice the cathode (striped end) of D713.
Adjustments Ground Probe at Chassis High Voltage - 9 Positive Probe at Cathode of D713 5 VR501 6 7 Connect the positive probe (red wire) of a digital voltmeter to the cathode (striped end) of D713. Connect the ground probe of the digital voltmeter (black wire) to the monitor’s metal chassis. Use a plastic screwdriver to adjust VR501 so that the voltmeter reads a voltage of 42.5 VDC ± 0.2V.
Adjustments Geometry - 10 Geometry Before you begin, open the control panel door. Note: In most cases, the preset factory settings require no adjustments to the picture. However, you can fine-tune the screen display by using the front panel controls.
Adjustments Geometry - 11 Vertical Center 1 2 Vertical Center Select Button Up Button Down Button Press the Select button until the vertical center indicator light turns on. Press the up button or down button to move the center of the picture up or down.
Adjustments Geometry - 12 Horizontal Center 1 2 Horizontal Center Select Button Up Button Down Button Press the Select button until the horizontal center indicator light turns on. Press the up button or down button to move the center of the picture right or left.
Adjustments Geometry - 13 Vertical Size 1 2 Vertical Size Select Button Up Button Down Button Press the Select button until the vertical size indicator light turns on. Press the up button or down button to increase or decrease the height of the picture.
Adjustments Geometry - 14 Horizontal Size 1 2 Horizontal Size Select Button Up Button Down Button Press the Select button until the horizontal size indicator light turns on. Press the up button or down button to increase or decrease the width of the picture.
Adjustments Geometry - 15 Pincushion Indicator Lights 1 2 Recall Button Select Button Up Button Down Button Simultaneously press the Select and Recall buttons so that the two leftmost indicator lights turn on. Press the up button or down button to change the curvature of the right and left sides of the picture.
Adjustments Geometry - 16 Keystone Indicator Lights 1 2 3 Recall Button Up Button Select Button Down Button Simultaneously press the Select and Recall buttons so that the two leftmost indicator lights turn on. Press the Select button so that the two rightmost indicator lights turn on. Press the up button or down button to change the slant of the right and left sides of the picture.
Adjustments Geometry - 17 Recalling Factory Settings Important: The monitor controls are set at the factory. To fine-tune and adjust the picture, use the front panel controls. The monitor will use your settings each time the computer is turned on. To revert to factory settings, press the Recall button.
Adjustments Focus Adjustment - 18 Focus Adjustment Before you begin, refer to the Take Apart chapter to remove the rear housing. Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Adjustments Focus Adjustment - 19 Because you make adjustments from the rear of the monitor, position a mirror to view the monitor screen. Do not reach around the monitor to adjust the controls. ±Warning: 1 2 3 Turn on the display and let it warm up for five minutes. Using the control strip, set the display to its highest resolution. Using the Display Service Utility, select the focus pattern.
Adjustments Focus Adjustment - 20 4 Contrast Brightness Set the brightness and contrast controls to maximum (turn fully clockwise).
Adjustments Focus Adjustment - 21 5 Focus Use a plastic screwdriver to adjust the Focus control on the flyback transformer for best center screen focus.
Adjustments Focus Adjustment - 22 6 Brightness Reset the brightness control to its detent (middle) position.
Adjustments Horizontal Centering - 23 Horizontal Centering Before you begin, refer to the Take Apart chapter to remove the rear housing. Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Adjustments Horizontal Centering - 24 monitor screen. Do not reach around the monitor to adjust the controls. Note: Perform the horizontal centering adjustment whenever the horizontal center control on the front panel does not have sufficient range. 1 Using the control strip, set the monitor to its highest resolution.
Adjustments Horizontal Centering - 25 2 Contrast Brightness Set both brightness and contrast controls to maximum (turn fully clockwise).
Adjustments Horizontal Centering - 26 3 SW701 Use a plastic screwdriver to position the arm of the horizontal center switch (SW701) until the raster is centered.
Adjustments Horizontal Centering - 27 4 Brightness Reset the brightness control to its detent (middle) position.
Adjustments Cutoff and White Balance - 28 Cutoff and White Balance Before you begin, refer to the Take Apart chapter to remove the rear housing. Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Adjustments Cutoff and White Balance - 29 monitor screen. Do not reach around the monitor to adjust the controls. Caution: When adjusting the controls on the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT. Note: Perform cutoff and white balance adjustments whenever the CRT/video board has been replaced or the screen exhibits a predominant color tint.
Adjustments Cutoff and White Balance - 30 1 2 3 Turn on the display and let it warm up for at least 10 minutes. Using the control strip, set the display to its highest screen resolution. Using the Display Service Utility, select the all-black display pattern.
Adjustments Cutoff and White Balance - 31 4 Contrast Brightness Preset both brightness and contrast controls to maximum (turn fully clockwise).
Adjustments Cutoff and White Balance - 32 5 Sub-Bright VR306 Use a plastic screwdriver to preset the Sub-Brightness control (VR306) to its maximum setting (counterclockwise).
Adjustments Cutoff and White Balance - 33 6 R Drive VR301 G Drive VR302 Sub-Contrast VR303 7 Preset the following controls to their center positions. • Sub-Contrast control (VR303) • R Drive control (VR301) • G Drive control (VR302) If you have set the controls correctly and the monitor is operating normally, the raster should have a bluish cast. If not, recheck the controls you preset in steps 4, 5, and 6.
Adjustments Cutoff and White Balance - 34 8 9 Screen Using the Display Service Utility, select the gray bars display pattern. With the room lights dimmed, use a plastic screwdriver to slowly adjust the Screen control so that the leftmost bar is completely black.
Adjustments Cutoff and White Balance - 35 10 Use a plastic screwdriver to adjust the G Bias (VR305) cutoff control until the screen has a bluishgreen hue in the darkest bars. R Bias (VR304) G Bias (VR305) 11 Adjust the R Bias (VR304) cutoff control to produce neutral gray in the darkest bars.
Adjustments Cutoff and White Balance - 36 become neutral gray: • If the display looks too red, turn up the G Bias or turn down the R Bias • If the display looks too green, turn up the R Bias or turn down the G Bias 12 Set the brightness control to its detent (middle) position.
Adjustments R Drive G Drive Cutoff and White Balance - 37 13 The drive controls normally will not require an adjustment. However, if a predominant color remains in the eight brightest bars, adjust the R Drive and/or G Drive controls to make these bars appear whiter.
Adjustments Cutoff and White Balance - 38 14 If required, perform a slight readjustment of the G Bias and R Bias cutoff controls to maintain neutral gray in the eight darkest bars.
Adjustments Cutoff and White Balance - 39 15 If the previous two steps caused more than the leftmost bar to become completely black, perform a slight readjustment of the Screen control so that only the leftmost bar is completely black.
Adjustments Cutoff and White Balance - 40 16 Using the Display Service Utility, select the Apple MultiScan 1705 selection screen, and then select the display pattern with the small white square in the center of a black screen.
Adjustments Light Meter Setup (Model 246) - 41 Lens Swivel Head Scale Light Meter Setup (Model 246) Before you begin, • Remove the metal slide (if installed) from the top of the light meter • Install the white lens with the red dot 1 Rotate the swivel head of the meter so the lens and the scale face opposite directions.
Adjustments Light Meter Setup (Model 246) - 42 2 Place the lens against the middle of the screen and read the scale.
K Service Source Exploded View Apple Multiple Scan 15AV Display
Exploded View 1 Rear Housing 922-2244 Speaker Grille Gaskets 922-2240 CRT/Video Board 922-2317 Sound-Out Cable 922-1781 Main Deflection Board 661-1143 Sound In Board 922-2238 Control Panel Board 922-2237 Bezel 922-2432 Speaker 922-2245 Control Panel Door 922-2243 Monitor Stand 922-2242 Power Button 922-2433 Video Cable 922-2241 Speaker Cover Set 922-2239 Power Cord 590-0380
