Genesis MP Service Guide DayStar Digital, Inc. Technical Support Department 5556 Atlanta Highway Flowery Branch, GA 30542 770-967-2077 fax: 770-967-3018 http://daystar.
Notices The information contained in this maintenance and service guide is subject to change without notice. DayStar Digital, Inc. shall not be held liable for technical or editorial errors or omissions; nor for incidental or consequential damages resulting from the performance or usage of this manual. This manual is protected by copyright. No part of this manual may be photocopied, reproduced, stored in a retrieval system, or transmitted in any form (i.e.
Preface About Genesis MP The Media-Publishing Workstation for the Next Century The machine you have before you is the new standard in the computer industry—the DayStar Genesis MP. Now Macintosh users can have the speed they associate with expensive, high-end workstations—but at a reasonable price. Genesis MP is the fastest Mac OS based system available—the first Mac OS based computer with speed built-in.
Conventions Used in this Guide The following conventions are used to distinguish elements of the text in this guide: Keyboard names will appear in all CAPS and BOLDFACE type. For example: HOME, TAB. When keys must be pressed simultaneously, the action is represented by the keyboard key name and the plus (+) symbol. For example: +
Standard Abbreviations The following abbreviations (units of measure) and the corresponding terms used in this guide are defined below: Genesis MP A amperes mA milliamperes dB decibels mA microamperes GB gigabytes MB megabytes Hz hertz MHz megahertz in. inches mm millimeters k 1000 ms milliseconds K 1024 ms microseconds KB kilobytes ns nanoseconds kg kilograms Ω ohms kHz kilohertz sec. seconds kΩ kilohms V volts lb.
Other Abbreviations Other abbreviations used in this guide are defined below: 6◆ AC alternating current A/D analog to digital CD-ROM compact-disc read-only memory CPU central processing unit DC direct current DIMM dual inline memory module DMA direct memory access DRAM dynamic RAM GND ground IC integrated circuit I/O input and output ISDN Integrated Services Digital Network MMU memory management unit n.c.
Electrostatic Discharge (ESD) Rules This section covers the proper procedures for grounding and utilization of recommended equipment and materials for preventive damage from Electrostatic Discharge (ESD). Static electricity can be discharged from one’s self or by a conductor thereby destroying static-sensitive devices or micro-circuitry. Often, static discharge may not be detected by sight, touch, or sound, although damage occurs.
ESD SAFE WORK AREA ∆ ! IMPORTANT Many electronic devices are ESD sensitive.
PREVENTING DAMAGE TO DISK DRIVES To prevent ESD and physical shock damage to floppy diskette drive and/or hard disk drive(s), ensure the following safety precautions: • Always utilize anti-static techniques when handling drives • Always re-package drives in their original shipping packaging • Never drop a drive onto any surface (hard/or soft) • Shield work surface with a minimum of 1-inch shock-proof foam • Always place drives “assembly-side-down” on shock-proof foam CD-ROM Drive ∆ ! ∆ ! Genesis MP CAU
Lithium Battery ∆ ! Genesis MP uses a lithium battery to store users’ preferences and time and date information while the unit is not turned on. CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer’s instructions. Lithium batteries cannot be recharged, therefore require disposal when exhausted. In addition to its explosive potential, lithium is water-reactive.
Chapter 1 Genesis MP Product Overview This chapter provides an overview of DayStar Digital’s Genesis MP and covers the following topics: Serial Number Genesis MP Configurations External Components of Genesis MP Internal Components of Genesis MP AC Power Functional Descriptions Serial Number Genesis MP's serial number should be provided to DayStar Digital, Inc. whenever requesting information or ordering spare parts. The serial number can be located on the rear I/O panel.
Genesis MP Configurations The Genesis MP comes in several configurations, allowing flexibility to meet any production need. Genesis MP configurations are distinguished by the number of PCI slots (initial models have three or six slots), and the aggregate clock speed of the processors on the nPOWER processor card (for example, the Genesis MP 528 has 4-132 MHz processors; 4 x 132 = 528).
AC Power Genesis MP provides power through the AC input power receptacle and a switched power convenience receptacle for monitor connection. Connecting AC Power to Genesis MP ∆ ! ∆ ! Genesis MP WARNING ALWAYS DISCONNECT POWER FROM GENESIS MP PRIOR TO PERFORMING ANY MAINTENANCE AND/OR SERVICE. FAILURE TO DISCONNECT POWER TO THIS PRODUCT MAY CAUSE LOSS OF LIFE. CAUTION Maximum current is 3 amps. Refer to the monitor’s service manual to determine its current requirements.
Functional Descriptions This section covers functional descriptions of key parts and features of the Genesis MP. For Removal and Replacement Procedures, refer to Chapter 4 of this guide. SCSI Interface Genesis MP has two SCSI interfaces: the internal Fast SCSI-2 interface, and the internal/external standard SCSI interface. The internal Fast SCSI-2 interface drives the internal hard disk and CD-ROM. The internal Fast SCSI-2 bus supports transfer rates up to 10 MB/sec.
Floppy Drive Genesis MP has one internal high-density floppy disk drive. The drive is connected to a 20-pin connector. The floppy drive will read and write Mac-formatted 800K and 1.44 MB and PC-formatted 720K and 1.44 MB floppies (to read and write PC-formatted disks, be sure the PC Exchange control panel is enabled. PCI Slots The 3 or 6 PCI slots allow for a broad range of expansion cards. Performance Tips: In the 6 slot Genesis MP, the six PCI slots are grouped into two groups of three each.
Memory Genesis MP does not have any main memory soldered to the logic board. At least one RAM DIMM must be present for the computer to operate. Genesis MP uses 168-pin Dual-Inline Memory Modules (DIMMs). DIMMs provide the widest possible data path to the processor, for maximum speed. Up to 8 or 12 DIMMs may be installed in Genesis MP, depending on the model. The table below shows maximum memory sizes by DIMM size. You can mix and match different DIMM sizes on one Genesis MP.
Chapter 2 Service Policies Warranty Service Plan Terms and Conditions. This document outlines the terms and conditions of the DayStar warranty repair program. Additional details of the service plan are available by contacting DayStar Digital.
Reseller reimbursement program DayStar’s Genesis MP warranty repair reimbursement program allows resellers to be credited for performing a warranty repair. A warranty repair is considered to be the complete start to finish process to repair a DayStar Genesis system. The DayStar Genesis MP’s design allows for straightforward replacement of defective or damaged subsystems. Consult the Warranty Service Program Overview for specific pricing schedules.
Delivery Timetable Standard Delivery In-stock merchandise will be shipped out the same day if received by noon EST. If received after noon EST the merchandise will be shipped out the next business day. Shipping Methods DayStar Digital, Inc. will pay to ship merchandise Federal Express Economy to the reseller. Returns of defective parts should be shipped to DayStar via Economy/2nd Day - bill recipient.
Chapter 3 Troubleshooting Resources Genesis MP is an advanced multiprocessing workstation. It is probably one of the most complex pieces of equipment you will service, but that doesn’t mean service has to be difficult. In this chapter, we provide you with the resources to make a diagnosis and take corrective action. In Chapter 4, you’ll see how to remove the serviceable components and replace them. Some service issues will be software-related or software/hardware combinations.
Flowcharts All procedures should be used as flowcharts to help with the diagnosis of defective modules. Please use the index to start isolating possible symptoms. If step 1 doesn’t correct the problem, go to the next step and so forth. Once the defective component has been isolated, please refer to the Removal and Replacement section to remove it. Once you have removed the defective component, refer to Chapter 2 - Service Policies to obtain replacement parts from DayStar.
Problem Resolution Several system problems can be resolved by resetting the CUDA Chip. By purging the information kept by the CUDA Chip, you can restart the system with default settings. It sends a constant signal to the power supply. If this signal is not within the power supply or Cuda’s specifications, the system will either shutdown or freeze. Procedure The procedure for resetting the CUDA Chip is as follows: Shut down the system. Remove the AC power connector from the back of the machine.
9. Replace nPOWER card. 10. Replace motherboard. In the event the Genesis MP starts to power up, but shuts down shortly after the boot sound is heard: 1. Reseat the nPOWER card, video card, and ROM SIMM (if present).* *It is possible that the ROM socket will not be populated (ROM will be soldered to the motherboard) and reseating the ROM SIMM should be disregarded. 2. Reset the CUDA Chip (see section CUDA Chip in this chapter). 3.
The System In the event there is a clicking, chirping, or thumping sound perform the following procedures: 1. Ensure there are no obstructions in the fan assemblies or the power supply fan. 2. Remove all PCI cards. Restart the system and observe any noises. If this problem doesn’t occur while the cards are absent, begin replacing them one at a time to determine which card might be causing the problem. 3. Remove the hard drive. If the problem no longer exists, replace hard drive. 4. Disconnect speaker.
During startup, the following message appears: “This startup disk will not work on this Macintosh model.....” perform the following procedures: 1. Verify the startup volume is working. 2. Verify that the system software is v7.5.2 or later. 3. Perform a clean install of the system software. (refer to the Genesis MP User Guide) 4. Replace the hard drive. 5. Replace the motherboard. In the event the system intermittently crashes or hangs perform the following procedures: 1. Verify the system software is v7.
In the event of performance loss in multiprocessing applications, perform the following procedures: 1. Ensure that only one copy of multiprocessing plug-in (for applications which use plug-ins) is installed per application. 2. Quit current multiprocessing application and relaunch application. 3. Shut down system and cold boot machine. 4. Ensure hard drive is not overly fragmented. 5. Verify correct version of MP Library is installed. 6. Reinstall System Software (v7.5.2 or later). 7.
In the event that system provides the correct startup sequence but the display is continuously rolling, perform the following procedures: 1. Ensure that your monitor does not sync on green. If it does, ensure that your graphics card supports this older standard. 2. Check display card manual for startup syncing options. 3. Reseat the nPOWER card, display card, and ROM SIMM (if present).
In the event the floppy drive does not eject the floppy diskette perform the following procedures: 1. Power off the computer. Hold down the mouse button while powering the computer on. 2. Check with a known-good floppy drive. 3. Replace the floppy drive. 4. Replace the floppy drive cable. 5. Replace the nPOWER card. 6. Replace the motherboard. In the event the floppy drive attempts to eject the diskette but cannot, perform the following procedures: 1.
Hard Drive In the event an internal hard drive is inoperable (drive doesn’t spin) perform the following procedures: 1. Check with another power connector on the power cable assembly. 2. Perform voltage readings (see Appendix C - Voltage Readings). Resolve any problems found. 3. Check with a known-good hard drive. 4. Replace hard drive. 5. Replace SCSI cable. 6. Replace power supply. In the event the internal hard drive is inoperable perform the following procedures: 1.
5. Replace or update the driver on the hard drive. 6. Initialize the drive using the formatting software provided with the Genesis MP (refer to the Genesis MP User Guide for instruction). 7. Perform voltage readings (see Appendix C - Voltage Readings). Resolve any problems found. 8. Check with a known-good hard drive. 9. Replace hard drive. 10. Replace SCSI cable. 11. Replace the nPOWER card. 12. Replace the motherboard. 13. Replace power supply.
In the event the cursor moves, but the mouse button doesn’t have a clicking effect perform the following procedures: 1. Boot from a floppy or bootable CD to eliminate possible system software corruption. 2. Check with a known-good mouse device. 3. Replace the mouse. 4. Replace the motherboard. 5. Replace the nPOWER card. In the event there is no response to any key pressed on the keyboard, perform the following procedures: 1. Check the keyboard connection to the ADB port. 2.
Chapter 4 Removal and Replacement This chapter explains procedures for removing and replacing the repair component assemblies available for servicing Genesis MP. The Genesis MP User Guide offers basic information on opening the Genesis MP, peripheral expansion, and removal and replacement of many of the subassemblies covered in this guide. In cases where a given procedure is explained in the Genesis MP User Guide, we will refer you to that guide for removal and replacement procedures.
∆ ! ∆ ! IMPORTANT DayStar Digital does not offer a complete chassis as a repair part. In cases of severe damage to the Genesis MP chassis, there may also be internal damage not apparent to the eye. This could compromise the operational safety of the unit, or cause further problems with reliability at a later time. If you are called upon to service a Genesis MP with a heavily damaged chassis, contact DayStar Digital to arrange for refitting of the unit.
Replaceable Parts The following are the repair component subassemblies of the Genesis MP. You can order these parts from DayStar Digital: nPOWER Daughtercard Motherboard Power Supply 5.25˝ Fan SCSI Cable Assembly Floppy Disk Drive Cable Assembly CD-ROM Audio Cable Assembly Drive Power/Fan Power Harness Motherboard Power Cable (2 versions) Power Switch and Cable Assembly LED and Cable Assembly Speaker and Cable Assembly Bezel Top Cap Assy. Bezel CD-ROM Assy. Bezel Blank Assy. Bezel Removable Media Assy.
nPOWER Processor Card 1. Shut down the Genesis MP and remove power from the unit. 2. Open Genesis MP (loosen the side door panel) by following the easy instructions in the Genesis MP User Guide. 3. Put on the anti-static wrist strap. 4. Disconnect the power connector from the nPOWER card. Be sure to disengage the connector lock as you pull the plug. Connector lock nPOWER power connector Disconnecting power from the nPOWER card 5.
6. Holding both sides of the nPOWER card bracket, firmly pull the bracket away from the chassis to remove the card from the motherboard nPOWER processor slot. Removing the nPOWER card 7. Once the nPOWER card and its bracket have been removed from the chassis, place the unit —with the metal bracket side face down—on a clean flat surface. 8.
Genesis MP Motherboard The Genesis MP motherboard is supported by an adjustable motherboard tray, which permits adjustment of the fit between the motherboard and the gasket at the rear of the machine. Normally, you will only have to adjust the fit if the motherboard tray has been removed or if a replacement motherboard is installed. Removal of the motherboard is as follows: 1. Shut down the Genesis MP and remove power from the unit. 2.
8. Remove the cables from the Genesis MP motherboard. ∆ ! a - Starting at the top left hand corner, the six cables running across the top of the motherboard are: Internal SCSI-2, Power Supply Cable Assy., Speaker, CD-ROM Audio Cable, Floppy Disk Drive, Power Supply Harness. IMPORTANT There is limited clearance between the motherboard power connector and the power supply bracket.
bly. Take care to note where each screw comes from. Refer to the diagrams Motherboard Screws and Standoffs for proper placement of screws upon reassembly. Failure to follow these instructions will result in damage to the nylon standoffs which help hold the motherboard in place. Replacement of the standoffs can be time-consuming. Proceed with care! 9. Remove the screws holding the motherboard in place. Consult the diagrams below for the locations of the screws.
Motherboard Screws and Standoffs 6-slot motherboard, 11 screw tray Small Screw Large Screw Screw Number Large Screw Large Metal Standoff Large Nylon Standoff Small Screw Small Metal Standoff Small Nylon Standoff Genesis MP Chapter 4 – Removal and Replacement ◆ 41
Motherboard Screws and Standoffs 6-slot motherboard, 8 screw tray Small Screw Large Screw Screw Number Large Screw Large Metal Standoff Large Nylon Standoff Small Screw Small Metal Standoff Small Nylon Standoff 42 ◆ Chapter 4 – Removal and Replacement Genesis MP
Motherboard Screws and Standoffs All 3 slot motherboards Small Screw Large Screw Screw Number Large Screw Large Metal Standoff Large Nylon Standoff Small Screw Small Metal Standoff Small Nylon Standoff Genesis MP Chapter 4 – Removal and Replacement ◆ 43
10. Carefully remove the motherboard by gently pulling it towards you, starting with the right hand side. Take care not to disturb the gasket (see photo below) between the motherboard and the rear panel of the case. Removing motherboard If you have removed the motherboard in order to access the motherboard tray for repair of fans or other procedures, move on to that work now. Return to this section for replacement of the motherboard.
If the motherboard has been replaced, you may need to adjust the motherboard tray to provide the snug fit required. If an adjustment is required, see the section Adjustment of the Motherboard and Motherboard Tray. 3. If you mix up the screws which hold the motherboard to the nylon standoffs, damage to the standoffs will occur. Refer to the Motherboard Screws and Standoffs diagrams for the proper placement of motherboard screws. 4. It is possible to damage the motherboard by overtightening the screws.
5. While supporting the motherboard to keep it from falling out, carefully remove the 2 screws holding the motherboard to the motherboard tray. Make sure that the motherboard tray does not move during removal of the motherboard. 6. Tighten the 6 motherboard tray securing screws, starting with the 2 screws in the center. Proceed to Genesis MP Motherboard, section on replacement of motherboard.
Power Supply Removal of the Power Supply is a simple procedure, and can be done without removing other components. 1. Unplug the 2 Power Supply cables from the motherboard (refer to diagram in Genesis MP Motherboard). 2. Unplug the power switch connector from the power supply harness (Power Supply Power Switch units only). See the section Power Switch and Cable for more information. ∆ ! 3. Unplug the Power Supply from the Drive Power/Fan Power Harness See section Drive Power/Fan Power Harness.
5. Remove the two screws holding the power supply retainer in place. Power supply retainer (side view) 6. Remove the power supply retainer. 7. Remove the CD-ROM Bezel and the Removable Media Bay Bezel (if installed). 8. Loosen the screws holding the CD-ROM drive (and any device installed in the removable media bay) and slide toward the front of the machine to provide clearance for removing the power supply. 9. Slide the power supply toward the front of the machine and up to remove. 10.
2. Ensure that the CD-ROM drive (and any installed removable media device) lines up well with its bezel, and that the tray operates smoothly without binding. 3. If the unit was originally equipped with a cable tie, use a new cable-tie to carefully reattach the speaker cable to the power supply wiring harness. 5.
2. When replacing motherboard tray, route LED and Power Switch cables as in the original unit. 3. Do not tighten securing screws for motherboard tray before tray adjustment. 4. Adjust the motherboard and motherboard tray. See section Adjustment of the Motherboard and Motherboard Tray. Motherboard Tray The motherboard tray holds two 5.25˝ fans, the “PCI Bracket” (which stabilizes the inner end of PCI cards, and the Genesis MP Motherboard (which itself holds the nPOWER daughtercard).
Replacement is the reverse of removal, with the following notes and exceptions: 1. Route Power Switch (Motherboard Power Switch units only) and LED cables through slot in motherboard tray. 2. Do not snug 6 motherboard tray securing screws until adjustment procedure is complete. 3. Adjust motherboard and motherboard tray. See section Adjustment of the Motherboard and Motherboard Tray.
Floppy Drive Cable The removal and replacement of the floppy drive cable is very easy and may be accomplished without removal of any other components. The cable connects to the motherboard at top edge, turns through 90 degrees, and runs along the back wall of the machine to the floppy disk drive. Consult the previous photo for routing. CD-ROM Audio Cable Removal and replacement of the CD-ROM cable is very easy and may be accomplished without removal of any other components.
9. Plug the new Drive Power/Fan Power Harness into the power supply harness connector. Dress the cables to match the original installation, securing the fan power cable at the chassis support rail anchor and the three connector drive power cable at the top right-hand corner of the 3.5˝ drive bay with cable ties. The remainder of reassembly is the reverse of removal.
Power Switch and Cable Assembly There are two versions of Genesis MP with respect to the power switch: Motherboard Power Switch machines, and Power Supply Power Switch machines. One power switch and cable assembly is used for both machines. The replacement procedures differ significantly, however. Determine which version of Genesis MP you are servicing before you begin, and read and understand the replacement procedure for that version before continuing. Power switch in front panel.
3. Remove the Front Panel. See the section Genesis MP Front Panel (metal). 4. Note the cable routing and existing anchor points. See section Speaker Cable/LED Cable/Power Switch Cable Routing. Carefully clip the cable ties attaching the Power Switch Cable to other cables and anchors. Cables are anchored on the inside of the front panel and at the Genesis MP side wall (accessible through the 3.5˝ drive bay). 5. Remove switch and cable.
3. Note the cable routing and existing anchor points. Carefully clip the cable ties attaching the Power Switch Cable to other cables and anchors. Cables are anchored on the inside of the front panel and at the Genesis MP side wall (accessible through the 3.5˝ drive bay). 4. Remove switch and cable. Switch is removed by squeezing the sides of the switch housing and pushing it forward. Reassembly is the reverse of disassembly, with the following exceptions: 1. Route and dress cables as in original unit.
5. Remove LED and cable. LED is removed by squeezing the sides of the LED housing and pushing it forward. Reassembly is the reverse of disassembly, with the following exceptions: 1. Route and dress cables as in original unit. See section Speaker Cable/LED Cable/Power Switch Cable Routing. Cable routes behind 3.5˝ drive bay and through slot in Motherboard Tray. Carefully install new cable ties at anchor points. 2. Adjust Motherboard Tray if needed - see section Adjusting the Motherboard Tray.
Reassembly is the reverse of disassembly, with the following exceptions: 1. Take care not to damage the speaker - it is vulnerable until the machine is assembled. 2. Route and dress cables as in original unit. See section Speaker Cable/LED Cable/Power Switch Cable Routing. Cable routes above 3.5˝ drive bay and through wiring harness cable anchor. Carefully install new cable ties at anchor points.
Genesis MP Front Panel (metal) It is necessary to remove the Genesis MP front panel to remove and replace the following subassemblies: LED & Cable Assembly, Power Switch & Cable Assembly, Speaker & Cable Assembly. You will remove the front panel and the 5.25˝ drive bay assembly as a unit. Removal of the front panel is not a trivial procedure, and to ensure success, DayStar recommends you read over the procedure and ensure that you have the correct understanding, tools, and workspace ready before proceeding.
5. Remove the eight screws holding the front panel assembly to the Genesis MP chassis. . ∆ ! Eight front panel securing screws Numbers are for tightening order on reassembly 6. View the Genesis MP from the front. Cable assemblies pass between the front panel and the chassis on the right-hand side of the front panel assembly.
2. The front panel provides support for the Genesis MP chassis. Place the Genesis in operating position on a flat surface to tighten the front panel securing screws. Check to make sure the chassis is not distorted and does not “rock” on two feet before continuing. Check at this time to ensure that the front bezel plastic lines up properly. 3. Remember to plug in the fan power, speaker, LED, power switch and all drive cables. 4.
To remove the top cap bezel: 1. Remove the CD-ROM drive to provide clearance. See section CD-ROM Drive. 2. Unscrew the two captive Phillips head screws using a 14˝ #2 Phillips-head screwdriver. Screwdrivers engaging top cap attaching screws Top cap attaching screws 3. Remove the top cap bezel. Reinstallation is the reverse of removal.
To remove the AV module: 1. Remove the two Torx™ attaching screws with a Torx T-8 driver. Removing the Audio/Video (AV) module 2. If you have not already done so, remove the nPOWER processor card to provide clearance. See section nPOWER Card. 3. Disconnect the AV cable from its slot near the nPOWER processor card slot. Removing the Audio/Video (AV) cable Replacement is the reverse of removal. Use care not to place undue strain on the delicate AV cable during replacement.
Lithium Battery ∆ ! Genesis MP uses a lithium battery to store users’ preferences and time and date information while the unit is not turned on. CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the battery manufacturer. Dispose of used batteries according to the instructions listed in the Preface. Battery location Here are the steps for replacing the lithium battery. 1. Put on your anti-static wrist strap. 2.
CD-ROM Drive Removal and Replacement of the CD-ROM drive is nearly identical to removal and replacement of any 5.25˝ removable media device. The CD-ROM drive differs from other removable media devices in that it also has an audio cable attached to the connector nearest to the Genesis MP’s right-hand side. For all other removal and replacement instructions, refer to Chapter 3 of the Genesis MP User Guide. Hard Drive DayStar currently provides several different drive configurations for Genesis MP.
Appendix A External Connections This chapter describes the I/O features of the Genesis MP and the interfaces for external I/O devices. The interfaces and their pinouts are listed below. Note: The A/V features and specification that are specific to the 3 slot Genesis MP are described in Apple’s Technical Information manual. This manual was included with the Power Macintosh that was used in the Genesis MP conversion process.
The Serial Ports The Genesis MP Systems have two serial ports located on the back panel. Both of these ports use 9-pin circular mini-DIN sockets. The serial port sockets will accept either 8 or 9-pin plugs. With external modules connected to these serial ports, the Genesis MP System can communicate with a variety of ISDN and other telephony transmission products.
The Apple Desktop Bus (ADB) The ADB is an asynchronous communication bus used for slower input devices (i.e., keyboard, mouse). The Genesis MP has a single ADB port located on the back panel. The connector is a 4-pin mini-DIN socket. ADB Connector Pin Assignments Pin Name Description 1 ADB Bidirectional data bus 2 PSW POWER ON signal 3 +5V +5 volts 4 GND Ground Ethernet Port Genesis MP has a built-in Ethernet Port.
SCSI Port Genesis MP uses a SCSI bus for external SCSI devices. The external SCSI connector is a 25-pin D-type connector. Refer to the table for the SCSI Connector pin assignments. The external SCSI port has automatic termination capability. When no external SCSI device is connected, the automatic termination capability is active. When one or more external SCSI devices are connected, the automatic termination is removed. The last SCSI device on the bus requires termination.
Sound Input Jack The Genesis MP stereo sound input jack is for connecting an external microphone or a line-level source. The computer provides sound digitization and recording with 16-bit samples at sample rates of up to 44.1 KHz and supports Apple Computer’s speech synthesis and recognition software. The sound input jack is a stereo mini-phone jack with an additional contact to supply power to an Apple microphone.
Appendix B Internal Connections This appendix describes the RAM, VRAM, cache and I/O features of the Genesis MP and the interfaces for internal I/O devices. Follow these guidelines when handling, disconnecting, or connecting the system: • When connecting or disconnecting a cable, always hold the cable by its connector (the plug, not the cord). • Always turn off the system and all of its components prior to connecting or disconnecting any cables or when adding or removing any component.
CD ROM Drive Genesis MP has CD-ROM drive, that supports worldwide standards and specifications for CD-ROM and CD-digital audio discs. This drive can read CD-ROM, CD-XA, CD-I, PhotoCD Discs, and Standard CD Audio Discs The CD-ROM drive features a quad-speed mechanism that supports sustained data transfer rates of 600 KB per second and a data buffer to further enhance performance. The Floppy Disk Drive Genesis MP has one internal high-density floppy disk drive. This drive is connected to a 20-pin connector.
RAM DIMM Connectors Genesis MP has 12 or 8 DIMMs/expansion slots. These RAM expansion slots accept an 8-byte DIMM and have a 64-bit-wide data bus. A minimum of one RAM DIMM must be present for the Genesis MP to operate. The 8-byte DIMMs can be installed one or more at a time. If the software detects two DIMMs that are the same size in corresponding slots, they will be configured as one single 128bit data bus, thus increasing performance.
Appendix C Voltage Readings Voltage measurement can help isolate the cause of a malfunction. Usually if power supply voltage as measured at the test points is out of tolerance, but is readable on the meter, suspect the power supply as the cause of the problem. If no voltage appears, or voltage appears intermittently, a shorted or open cable, malfunctioning peripheral or the power supply may be the cause.
nPOWER 3.3v Supply Pins 1, 2, 3 - Purple - 3.3v Pins 4, 5, 6, 7, 8 - Black - Ground Measuring nPOWER 3.3v supply PURPLE/BLACK = 3.3 VDC +/- .2 VDC Hard Drive Power Cable Pin 1 - Orange - 12 VDC Pins 2, 3 - Black - Ground Pin 4 - Red - 5 VDC Metering drive power cable 78 ◆ Appendix C ORANGE/BLACK = 12 VDC +/- .7 VDC RED/BLACK = 5 VDC +/- .
Motherboard 3.3v Supply Pins 1-4 - Purple - 3.3 VDC Pin 5 - Brown Pins 6-9 - Black - Ground Pin 10 - White Measuring motherboard 3.3v supply PURPLE/BLACK = 3.3 VDC +/- .2 VDC Motherboard Main Power Supply Pins 1-4, 13-16 - Red - 5 VDC Pins 5-9, 17-20 - Black - Ground Pin 10 - n.c. Pin 11 - Blue - -12 VDC Pin 12 - Yellow - Trickle 5 VDC Pin 21 - White Pin 22 - Orange - 12 VDC Measuring motherboard main power supply RED/BLACK = 5V +/- ORANGE/BLACK = 12V +/- .7 BLUE/BLACK = -12V +/- .3 1.
Battery Metering battery BATTERY 3.6 VDC +/- .4 VDC Set the voltmeter to the 10 volts DC scale. Next, hold the positive probe of the voltmeter to the positive end of the battery (marked “+” on the logic board) and the negative probe to the negative end of the battery. If the battery voltage is below 3.2 volts, replace the battery. Refer to Chapter 1 of this guide for battery disposal procedures.
