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139

C H A P T E R

System Board Overview

This chapter contains descriptions of the system board. The following topics are
presented in this chapter:

Preventing Damage

Caution –

Use an antistatic mat when working with the system board. An antistatic

mat contains the cushioning needed to protect the underside components, to prevent
board flexing, and to provide antistatic protection.

Handling System Boards and
Assemblies

Caution –

The system chassis power-on/standby switch must be set to standby

mode, and the AC power cord must be plugged in to ensure proper grounding.

Caution –

Hot surface. Avoid contact. Surfaces are hot and may cause personal

injury if touched.

Summary of Contents for SPARCstation 20

Page 1: ...docfeedback sun com SPARCstation 20 Service Manual Part No 801 6189 12 Revision A July 1996 Sun Microsystems Computer Company A Sun Microsystems Inc Business 901 San Antonio Road Palo Alto CA 94303 49...

Page 2: ...FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT Copyright 1997 Sun Microsystems Inc 901 San Antonio Road Palo Alto Californie 94303 4900 U S A Tous droits r serv s Ce produit ou document est prot g par u...

Page 3: ...ew 3 Rear View 4 Software Requirements 6 Internal Options 6 External Options 7 2 Troubleshooting Overview 9 Default Boot Mode 9 Diagnostic Tools 11 OpenBoot PROM Diagnostics 12 SunDiag System Exercise...

Page 4: ...Test 29 System Board Test 31 Caps Lock Key Fails to Flash During the POST 32 Disk Drive Errors 33 SIMM Errors 35 5 Safety and Tools Requirements 39 Safety Requirements 39 Symbols 40 System Precaution...

Page 5: ...ving the Speaker 64 Installing the Speaker 66 Fan Assembly 67 Removing the Fan 67 Installing the Fan 69 Removing the Fan DC Power Harness 74 Installing the Fan DC Power Harness 79 SCSI Backplane 83 Re...

Page 6: ...nCD 2Plus Drive Type Chassis 108 Installing the Diskette Drive Cable SunCD 2Plus Drive Type Chassis 110 Removing the Diskette Drive Cable SunCD 4 Drive Type Chassis 111 Installing the Diskette Drive C...

Page 7: ...52 Removing an SBus Card 152 Installing an SBus Card 156 DSIMMs VSIMMs and NVSIMMs 159 DSIMM 159 VSIMM 160 NVSIMM 161 Removing a SIMM 161 Installing a SIMM 163 Auxiliary Video Board 168 Removing an AV...

Page 8: ...ifications 194 B Functional Description 195 System Overview 195 System Architecture 195 System Board 196 SBus Card 197 MBus Module 198 MBus to SBus Interface 198 Memory 198 SBus to SCSI Ethernet and P...

Page 9: ...I Addresses 219 Disk Drives 219 E Selected On Board Diagnostics 221 test device alias test device pathname 221 test all 222 watch clock 223 watch net watch aui watch tpe watch net all 224 probe scsi p...

Page 10: ...x SPARCstation 20 Service Manual July 1996...

Page 11: ...RE 3 2 Type 5 Keyboard Key LEDs 25 FIGURE 4 1 Power Supply Connector Pinouts 30 FIGURE 4 2 Power Supply and Power Supply Connector Location 31 FIGURE 4 3 System Board SIMM Slot Locations 36 FIGURE 5 1...

Page 12: ...71 FIGURE 8 14 Securing the Fan Assembly Using the Fan Installation Tool 72 FIGURE 8 15 Connecting the Fan Assembly DC Power Connector 73 FIGURE 8 16 Securing the Fan Assembly DC Power Connector 74 FI...

Page 13: ...Connectors 102 FIGURE 8 40 Internal Cables and DC Power Connector SunCD 4 Drive Type Chassis 104 FIGURE 8 41 Back Panel Captive Screws 104 FIGURE 8 42 Removing the System Board 105 FIGURE 8 43 Disket...

Page 14: ...alling the CD ROM Drive Filler Panel 137 FIGURE 10 1 System Board 141 FIGURE 10 2 Exploded View of the System Board 142 FIGURE 11 1 MBus Module Retainers 144 FIGURE 11 2 Extractor Installation on a Si...

Page 15: ...1 27 DSIMM Back View 164 FIGURE 11 28 VSIMM Back View 165 FIGURE 11 29 NVSIMM Battery Side 165 FIGURE 11 30 Aligning the NVSIMM in the Slot Back View 166 FIGURE 11 31 Inserting a DSIMM 167 FIGURE 11 3...

Page 16: ...Board Block Diagram 197 FIGURE B 2 DSIMM Memory System 200 FIGURE B 3 VSIMM Memory System 201 FIGURE B 4 MACIO ASIC Functional Block Diagram 203 FIGURE B 5 SEC ASIC Functional Block Diagram 204 FIGURE...

Page 17: ...BLE 4 1 Troubleshooting Tips 27 TABLE 4 2 Power Supply Connector Pin Assignments 31 TABLE 4 3 Troubleshooting Disk Drive Errors 34 TABLE 4 4 SIMM Slots and Physical Address 35 TABLE 4 5 SIMM Slot Layo...

Page 18: ...nector Pin Assignments 209 TABLE C 4 Serial Ports A and B Connector Pin Assignments 210 TABLE C 5 Twisted Pair Ethernet Connector Pin Assignments 212 TABLE C 6 SCSI Connector Pin Assignments 212 TABLE...

Page 19: ...parts See the following table TABLE P 1 Document Organization Part Number Title Chapter Number Title Description Part 1 System Information Chapter 1 Product Description Describes the standard feature...

Page 20: ...res to remove and replace storage devices Part 5 System Board Chapter 10 System Board Overview Provides system board description and damage prevention identifies replaceable system board components Ch...

Page 21: ...in antistatic bags before placing it on any surface Individuals who service this equipment must observe all safety precautions and ensure compliance with skill level requirements certification and al...

Page 22: ...list all files machine_name You have mail AaBbCc123 What you type contrasted with on screen computer output machine_name suPassword AaBbCc123 Command line placeholder replace with a real name or value...

Page 23: ...book for SMCC Peripherals contains Solaris 2 x software commands On line AnswerBook for the complete set of documentation supporting the Solaris 2 x software environment Other software documentation t...

Page 24: ...lists the default system prompt and superuser prompt for the C shell Bourne shell and Korn shell TABLE P 4 Shell Prompts Shell Prompt C shell prompt machine_name C shell superuser prompt machine_name...

Page 25: ...has four audio ports on the back panel and contains an internal speaker A variety of internal storage devices are available 535 Mbyte hard disk drive 1 05 Gbyte hard disk drive 2 1 Gbyte hard disk dr...

Page 26: ...ing subassemblies boards and components see FIGURE 1 2 System board SIMMs DSIMMs eight maximum VSIMMs two maximum Non volatile SIMM NVSIMM one SBus card four maximum MBus module two maximum Hard disk...

Page 27: ...RE 1 3 shows an interior view of the major subassemblies and the system board Diskette data Diskette Power Chassis Disk Fan cable supply drive 2 Speaker LED SCSI data cable Fan DC power cable External...

Page 28: ...the system Appendix C provides additional information The appendix describes each connector on the back panel lists pin assignments signal descriptions and shows detailed connector illustrations Diske...

Page 29: ...B 7C 7D 5 or 6 10A Legend 1 Power On Standby switch 7D Audio line in 2 AC power outlet 8 SCSI 3 Lock block 9 Twisted pair Ethernet 4 MBus 10A Parallel 5 SBus 10B AUI Ethernet 6 AVB 13W3 video 11 Keybo...

Page 30: ...Solaris 2 x releases Multiprocessor versions Solaris 2 3 SunOS 5 3 software environment and Solaris 2 3 Supplement Revision B or later Solaris 2 x releases Systems configured with VSIMMs Solaris 2 3...

Page 31: ...ties are 4 and 8 Mbyte NVSIMM 1 Provides non volatile disk I O storage for file system acceleration occupies one VSIMM slot TABLE 1 3 External SCSI Options Unit Description Desktop backup pack Tape dr...

Page 32: ...ion pedestal Up to eight SCSI disks CD ROM drive tape drive other non disk units Requires a minimum of two SCSI controllers if all three trays are used No more than seven SCSI devices on each SCSI bus...

Page 33: ...de FIGURE 2 1 is a flow diagram of the default boot mode for OpenBoot PROM Version 2 14 or later The default boot mode initiates the power on self test POST diagnostics if any one of the following con...

Page 34: ...SBus devices and interpret their drivers No Yes No Display banner and run high level tests Display Testing Go to A Yes Boot from device alias net Boot from device alias disk Boot user specified devic...

Page 35: ...NVRAM Resides in the OpenBoot PROM Initialized at power on when the keyboard Stop L1 d keys are pressed and held or if the diag switch parameter is set to true or if the keyboard is disconnected See...

Page 36: ...TABLE 2 3 OpenBoot PROM Diagnostic Tests Type of Test Description Preparation test screen Tests the video graphics hardware and monitor The diag switch NVRAM parameter must be set to true test floppy...

Page 37: ...e and the message Keyboard Present is displayed Keyboard must be connected test memory Tests main memory Set diag switch to true or set selftest megs to the desired parameter test all Tests all system...

Page 38: ...art of the system that failed Note If a SunDiag system exerciser error message is not descriptive enough execute the POST for a more descriptive explanation see Chapter 3 probe scsi Returns the SCSI d...

Page 39: ...e SunVTS kernel SunVTS user interface SunVTS teletype SunVTS Kernel The SunVTS kernel vtsk diagnostic tool controls all testing and operates in the OpenWindows background When activated vtsk probes th...

Page 40: ...letype The SunVTS teletype vtstty diagnostic tool controls the vtsk from either a command shell or a terminal attached to a serial port Most options available in vtstty have equivalent options in vtsu...

Page 41: ...urned on in normal mode the POST is not executed and control is sent to the OpenBoot PROM If autoboot is enabled set to true the operating system is loaded If autoboot is disabled system initializatio...

Page 42: ...tip connection to another Workstation See Setting Up a tip Connection If a terminal is not connected to serial port A or a tip connection is not implemented the screen will be blank during the POST di...

Page 43: ...sted In setting up a tip connection serial port A is used to connect to another Sun Workstation either the same type of SPARC system or a different type of Sun Workstation or server system The tip con...

Page 44: ...l be displayed at this window 4 When POST is completed disconnect the tip window by typing tilde period POST Tests CODE EXAMPLE 3 3 provides a sample listing of the full diagnostic mode tests executed...

Page 45: ...Test D Cache STAG Write Read Test I Cache RAM Write Read Test I Cache PTAG Write Read Test I Cache STAG Write Read Test I Cache Flush Test Cache Flashclear Test MXCC Register Test MXCC E Cache Tag RAM...

Page 46: ...OFF Test Soft Interrupts ON Test PROC0 User Timer Test PROC0 Counter Timer Test System Counter Test MSI MSBI Control Reg Tests IOMMU CAM NTA Pattern Test IOMMU TLB NTA Pattern Test IOMMU CAM TLB Comp...

Page 47: ...is not a supported configuration Status LEDs and Indicators The system LED is located on the right front side of the chassis and lights when the system is operating FIGURE 3 1 shows the location of th...

Page 48: ...LED pattern See FIGURE 3 2 and TABLE 3 1 Specific keyboard keys include Scroll Lock Num Lock Compose Note During normal system operation the keyboard key LEDs should not be interpreted as diagnostic...

Page 49: ...ssed but operational integrity of the system is questionable initiate the OpenBoot PROM diagnostics If POST failed use the keyboard LED indicator status or a displayed error message if a terminal or t...

Page 50: ...26 SPARCstation 20 Service Manual July 1996...

Page 51: ...the LED cable is connected see Power Supply Test on page 29 and System Board Test on page 31 Disk drive fails to boot or does not respond Shut down the system The SCSI controller or disk drive may be...

Page 52: ...for the VSIMM in SPARCstation 20 systems with the SX graphics option This enables video output on the monitor connector on the system back panel Slot J0305 may be used for a DSIMM VSIMM or NVSIMM in S...

Page 53: ...l power switch to ON and observe the keyboard The keyboard LEDs should briefly light An audible tone from the keyboard should be heard If no tone is heard or if no lights are seen the power supply may...

Page 54: ...20 Service Manual July 1996 2 Replace the power supply assembly if any of the voltages are not present See Power Supply on page 55 FIGURE 4 1 Power Supply Connector Pinouts 9 1 2 3 4 5 6 7 8 18 10 111...

Page 55: ...TABLE 4 2 Power Supply Connector Pin Assignments Pin Color Description Pin Color Description 1 Blue 12 10 Black Ground 2 Brown 12 11 Black Ground 3 Red 5 12 Black Ground 4 Red 5 13 Black Ground 5 Red...

Page 56: ...If a failure occurs during POST an LED may light up TABLE 3 1 in Chapter 3 describes types of problems that occur when an LED on the keyboard lights up 4 Observe serial port A diagnostic information T...

Page 57: ...system SCSI controller has successfully probed the devices This indicates that the system board is working correctly 2 If a disk does not respond a Ensure that every SCSI disk and other SCSI devices o...

Page 58: ...plications Replace the disk drive indicated by the failure message The operating system identifies the Bottom drive SCSI address 3 as sd0 or c0t3d0 and the top drive SCSI address 1 as sd1 or c0t1d0 SC...

Page 59: ...to accommodate a 64 Mbyte DSIMM If a 16 Mbyte or 32 Mbyte DSIMM is installed in a bank the unused addresses are mapped out by the memory management hardware The physical memory starting address of an...

Page 60: ...oard AVB must be installed on the system board Only one NVSIMM is supported If used it is installed in J0305 DSIMM7 slot TABLE 4 5 SIMM Slot Layout and Installation Sequence VSIMMs and or NVSIMM Insta...

Page 61: ...Chapter 4 Troubleshooting Procedures 37 Note A DSIMM must be installed in J0201 for the system to function properly...

Page 62: ...38 SPARCstation 20 Service Manual July 1996...

Page 63: ...rotection observe the following safety requirements Follow all cautions warnings and instructions marked on the equipment Ensure that the voltage and frequency rating of the power outlet to be used ma...

Page 64: ...n if the power on standby switch or keyboard buttons are not touched Wrist strap ESD Wear a grounded wrist strap when handling printed circuit boards drives or other components such as SIMMs ESD mat E...

Page 65: ...are considered qualified Caution Before beginning a service task carefully read each of the procedures in this manual If similar operations on comparable equipment have not been performed do not attem...

Page 66: ...e following tools and equipment Antistatic mat Wrist strap Long needlenose pliers Phillips screwdriver Flat blade screwdriver SIMM installation tool Conductive foam to store chips DIP IC extraction to...

Page 67: ...tatic bag Always wear an antistatic wrist strap connected to a metal surface on the chassis when working on system components and parts Do not place the boards cards or modules on an unprotected surfa...

Page 68: ...44 SPARCstation 20 Service Manual July 1996...

Page 69: ...ing off the system power terminate the operating system 1 Notify users that the system is going down if networked system 2 Back up the system files and data 3 Shut down the system 4 Ensure that the po...

Page 70: ...the standby switch prior to disconnecting the AC power cord Note The AC power cord provides the grounding path to safely discharge static electricity Take note where each cord and cable attaches to th...

Page 71: ...r SBus cards To test these devices run OpenBoot PROM diagnostics before the system has booted Appendix E Selected On Board Diagnostics describes using the test command to test SBus cards and drives Al...

Page 72: ...ending with the SCSI peripheral directly connected to the computer system d Monitor e Power on Standby switch on the system back panel FIGURE 6 2 2 The operating system should load or the ok prompt sh...

Page 73: ...tem See Removing Power from the System on page 45 2 Loosen the screw on the corner of the back panel FIGURE 7 1 Note Do not loosen the screw securing the power supply to the rear panel FIGURE 7 1 Lock...

Page 74: ...strap and use an ESD protected mat when handling components When removing components other than the power supply leave the power cord connected to both the system and the wall receptacle When removin...

Page 75: ...ernal Access 51 FIGURE 7 3 Grounding Wrist Strap to Power Supply Replacing the Cover To replace the cover 1 Remove the wrist strap 2 Grasp the cover by the front and rear edges FIGURE 7 4 Power supply...

Page 76: ...3 Align the cover hinge tabs with the chassis tab slots on the bottom front of the system Ensure that the tabs are locked into the chassis slots 4 Lower the cover onto the chassis FIGURE 7 4 5 Replace...

Page 77: ...ution Do not use a power driver to tighten the back panel screws Do not overtighten the back panel screws 6 Tighten the screw on the back panel corner and secure the cover FIGURE 7 6 FIGURE 7 6 Back P...

Page 78: ...54 SPARCstation 20 Service Manual July 1996...

Page 79: ...Caution To avoid system board or component damage press the standby side of the power on standby switch before disconnecting the power cord from the back panel When the power supply power is restored...

Page 80: ...rist strap See Chapter 7 Note The wrist strap is usually grounded to the power supply When removing or installing the power supply ground the wrist strap to the metal edge of the system back panel 4 R...

Page 81: ...k Panel and Removing the Power Supply 5 Disconnect the DC power harness from the rear of the power supply FIGURE 8 2 6 Set the power supply aside Drive bracket Captive screw 2 Power supply DC power co...

Page 82: ...harness to the rear of the power supply FIGURE 8 2 2 Lower the power supply into the chassis at an angle such so the DC power harness fits under the edge of the chassis drive bracket 3 Slide the powe...

Page 83: ...ard FIGURE 8 4 6 Remove the wrist strap and replace the cover See Chapter 7 7 Connect the power cord to the rear of the system unit and the wall receptacle 8 Power on the system See Turning On the Pow...

Page 84: ...e system See Removing Power from the System on page 45 2 Remove the cover and attach a wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling components Wear an antistatic...

Page 85: ...corner of the chassis FIGURE 8 6 4 Use the tip of a small screwdriver to work the cable and LED free from the light pipe tabs FIGURE 8 6 5 Disconnect the shrink wrapped section of the LED cable from...

Page 86: ...62 SPARCstation 20 Service Manual July 1996 FIGURE 8 6 LED Light Pipe Detail Light pipe tabs Shrink wrapped LED cable System right front corner...

Page 87: ...antistatic bags before placing it on any surface 1 Position the LED near the tabs and light pipe at the corner of the system FIGURE 8 6 2 Use the tip of a small flatblade screwdriver to work the shri...

Page 88: ...t strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing it on any surface Caution Avoid damaging the speaker surface use care when working near or handlin...

Page 89: ...se the second lower cover tab 4 Remove the two screws that secure the speaker to the chassis Set the screws aside FIGURE 8 8 FIGURE 8 8 Speaker Cover Detail 5 Grasp the metal speaker rim and lift the...

Page 90: ...damaging the speaker surface use care when working near or handling the speaker Do not touch the speaker diaphragm with tools or fingers Grasp the speaker by the metal edges 1 Slide the spade connecto...

Page 91: ...as follows Note If installed the CD ROM drive must be removed before the fan assembly can be removed or installed see Removing a CD ROM Drive on page 123 Removing the Fan 1 Remove power from the syst...

Page 92: ...an clip from the chassis metal drive bracket c While prying the clip up pull the fan housing toward the center of the system to free the bottom clip from the chassis FIGURE 8 11 d Set the fan aside FI...

Page 93: ...when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing it on any surface Metal Front Right side drive br...

Page 94: ...e CD ROM drive DC power connector 1 Insert the fan bottom mounting clip into the opening at the bottom of the system chassis Place the side mounting clip over the edge of the chassis FIGURE 8 12 Note...

Page 95: ...n Assembly 3 Place the notched tip of the fan installation tool over the side mounting clip and press down FIGURE 8 14 Locate side mounting clip against this surface Front Right side Fan assembly Side...

Page 96: ...FIGURE 8 15 Note Connectors and terminals are keyed to ensure proper connection 5 Secure the fan DC harness beneath the cable restraint FIGURE 8 15 Note Store any excess cabling under the cable restra...

Page 97: ...place the cover See Chapter 7 8 Power on the system See Section Turning On the Power on page 6 47 FIGURE 8 15 Connecting the Fan Assembly DC Power Connector Front Right side DC power connector Fan ass...

Page 98: ...connector built into the system DC power harness see DC Power Harness on page 97 If the system has a separate fan DC power harness the fan DC power harness must be removed from the CD ROM drive DC po...

Page 99: ...er 7 Caution Use proper ESD grounding techniques when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing i...

Page 100: ...y 1996 FIGURE 8 18 Fan DC Power Harness and Cable Restraint 4 Disconnect the fan power connector from the DC power connector FIGURE 8 19 Front Right side Fan DC power harness Note Cable restraints and...

Page 101: ...excess fan DC cable from the cable trough along the front of the chassis remove the fan DC power harness FIGURE 8 20 6 Disconnect the fan DC power connector from the CD ROM drive power connector FIGU...

Page 102: ...vice Manual July 1996 FIGURE 8 20 Lifting Fan DC Cable from the Cable Trough Fan power Front Cable trough Right side connector CD ROM drive DC power connector Note Cable restraints and SCSI data cable...

Page 103: ...en handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing it on any surface 1 Locate the CD ROM drive DC power...

Page 104: ...FIGURE 8 23 Note Connectors and terminals are keyed to ensure proper connection 3 Place the excess cable into the cable trough along the front of the chassis FIGURE 8 24 Note Be sure an adequate amoun...

Page 105: ...ling Subassemblies 81 FIGURE 8 23 Connecting the Fan DC Power Connector Front Right side Fan DC power connector Fan two wire connector CD ROM drive DC power connector Note Cable restraints and SCSI da...

Page 106: ...r connector FIGURE 8 25 Note Connectors and terminals are keyed to ensure proper connection 5 Detach the wrist strap and replace the cover See Chapter 7 6 Power on the system See Turning On the Power...

Page 107: ...lies 83 FIGURE 8 25 Fan DC Power Connector SCSI Backplane To remove and install the SCSI backplane proceed as follows Fan assembly Fan connector DC power connector Front Right side Note Cable restrain...

Page 108: ...m on page 45 2 Remove the cover and attach a wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling components Wear an antistatic wrist strap and use an ESD protected mat...

Page 109: ...ated on the right side of the SCSI backplane This part of the SCSI backplane extends through a slot in the drive bracket 6 Grasp the left edge of the SCSI backplane and rotate it away from the chassis...

Page 110: ...etmetal chassis Note If there is difficulty in accessing the bottom plastic tab with needlenose pliers use a flat blade screwdriver to push the tabs toward the chassis corner b Squeeze the plastic bra...

Page 111: ...ected mat Store ESD sensitive components in antistatic bags before placing it on any surface 1 Replace the SCSI backplane bracket as follows FIGURE 8 27 a Position the plastic SCSI backplane bracket s...

Page 112: ...power socket respectively FIGURE 8 26 3 Replace the hard disk drive s See Installing a Hard Disk Drive on page 120 4 Detach the wrist strap and replace the cover See Chapter 7 5 Power on the system Se...

Page 113: ...nts in antistatic bags before placing it on any surface 3 Disconnect the following cables from the system board FIGURE 8 29 Diskette data cable optional SCSI data cable DC power connector Speaker LED...

Page 114: ...E 8 30 Back Panel SBus Slots and Captive Screws 6 Press the plastic connector clip and disconnect the DC power connector from the SCSI backplane FIGURE 8 31 FIGURE 8 31 SCSI Backplane SCSI Data and DC...

Page 115: ...handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing it on any surface Note Tape or tie wrap markers on int...

Page 116: ...124 4 Position the system board into place and tighten the two captive screws on the back panel that secure the system board to the chassis FIGURE 8 34 5 Replace any SBus cards see FIGURE 8 37 See Ins...

Page 117: ...hassis 1 Remove power from the system See Removing Power from the System on page 45 2 Remove the cover and attach a wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling...

Page 118: ...lears the plastic card guide FIGURE 8 34 Caution Place the system board on an antistatic surface 6 Remove the SunCD 4 CD ROM drive See Removing a CD ROM Drive on page 123 Speaker LED connector Card gu...

Page 119: ...GURE 8 33 a The SCSI data cable from the metal cable clips on the chassis wall and from the plastic cable clips on the card guide b The DC power harness from the SCSI backplane c The internal SCSI dat...

Page 120: ...between the hard disk drive and the chassis wall P2 connects to the SunCD 4 drive if installed or is secured under the chassis floor metal cable clips 1 Secure the SCSI data cable under the plastic ca...

Page 121: ...ess varies depending on the chassis The following sections provide DC power harness removal and installation for each chassis type Removing the DC Power Harness SunCD 2Plus Drive Type Chassis 1 Remove...

Page 122: ...wer supply ground the wrist strap to the upper edge of the back panel 4 Remove any SBus cards See Removing an SBus Card on page 152 5 Disconnect the diskette data cable optional SCSI data cable DC pow...

Page 123: ...el to the chassis FIGURE 8 37 7 Slide the system board back slightly to access the cables 8 Remove the power supply See Removing the Power Supply on page 55 9 Remove the CD ROM drive See Removing a CD...

Page 124: ...1996 FIGURE 8 37 Back Panel SBus Slots and Captive Screws 10 Remove the diskette drive See Removing a Diskette Drive on page 127 11 Free the SCSI cable from the metal cable guides FIGURE 8 38 Captive...

Page 125: ...from the metal cable guides FIGURE 8 39 13 Disconnect the DC power connector P3 from the SCSI backplane FIGURE 8 39 14 Remove the DC power harness from the chassis Metal cable DC power harness Speaker...

Page 126: ...rface Note Tape or tie wrap markers on internal cables help in properly routing the cables through the metal cable guides The part of each cable with a marker is to be visible between the metal cable...

Page 127: ...ssis FIGURE 8 37 6 Connect the diskette data cable SCSI data cable DC power connector and speaker LED cable to the system board FIGURE 8 36 7 Install any SBus cards See Installing an SBus Card on page...

Page 128: ...8 41 FIGURE 8 40 Internal Cables and DC Power Connector SunCD 4 Drive Type Chassis FIGURE 8 41 Back Panel Captive Screws Speaker LED connector Card guide cable clip 2 Cable clip 3 located on Cable cl...

Page 129: ...rd on an antistatic surface 6 Remove the SunCD 4 drive See Removing a CD ROM Drive on page 123 7 Disconnect the DC power harness from the diskette drive 8 Remove the DC power harness from the SCSI bac...

Page 130: ...clips that are nearest to the system board The P2 CD ROM drive harness should lie under the second chassis floor metal cable clip The second colored tape mark farthermost from the P3 connector of the...

Page 131: ...card guide then lift the rear of the board slightly and slide it along the card guide until it is fully inserted FIGURE 8 34 5 Connect the DC power cable diskette data cable SCSI data cable and speake...

Page 132: ...rive Cable SunCD 2Plus Drive Type Chassis 1 Remove power from the system See Removing Power from the System on page 45 2 Remove the cover and attach a wrist strap See Chapter 7 Caution Use proper ESD...

Page 133: ...Cable Location 6 Pull the plastic cable tab to disconnect the diskette drive cable from the system board FIGURE 8 44 FIGURE 8 44 Diskette Drive Cable Plastic Tab Diskette drive cable Plastic tab Disk...

Page 134: ...bracket area of the chassis FIGURE 8 45 Pulling the Diskette Drive Cable Through the Drive Bracket Opening Installing the Diskette Drive Cable SunCD 2Plus Drive Type Chassis Caution Use proper ESD gro...

Page 135: ...on Installing a Diskette Drive on page 9 132 4 Install the CD ROM drive if it was removed earlier See Section Installing a CD ROM Drive on page 9 124 5 Remove the wrist strap and replace the cover See...

Page 136: ...able from the system chassis FIGURE 8 46 System Board Cable Routing SunCD 4 Drive Type Chassis Installing the Diskette Drive Cable SunCD 4 Drive Type Chassis Caution Use proper ESD grounding technique...

Page 137: ...metal cable clip in the chassis floor 2 Connect the diskette drive cable to the system board FIGURE 8 46 3 Install the diskette drive See Installing a Diskette Drive on page 132 4 Install the CD ROM d...

Page 138: ...114 SPARCstation 20 Service Manual July 1996...

Page 139: ...Chapter 8 Removing and Installing Subassemblies 115...

Page 140: ...116 SPARCstation 20 Service Manual July 1996...

Page 141: ...disk drive connects to the SCSI backplane A handle on each single connector drive helps to install the hard disk drive into the SCSI backplane socket To remove and install a hard disk drive proceed a...

Page 142: ...top disk drive before removing the bottom disk drive Note The disk drive position determines the assigned SCSI address When installed the bottom disk drive is assigned SCSI address 3 and the top disk...

Page 143: ...handle pivots to disconnect the drive from the socket on the SCSI backplane 6 Grasp the drive handle and lift the drive straight up and out of the chassis 7 Place the drive on an antistatic surface 8...

Page 144: ...ng a Hard Disk Drive Installing a Hard Disk Drive Caution Use proper ESD grounding techniques when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive c...

Page 145: ...e hard drive is pointed toward the SCSI backplane c Push the drive handle down away from the connector until the handle locks into the latch Note When lowered the drive handle acts as a mechanism to e...

Page 146: ...122 SPARCstation 20 Service Manual July 1996 FIGURE 9 4 Installing a Hard Disk Drive...

Page 147: ...and attach a wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components...

Page 148: ...wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing it on any surface Note Ensure that the same drive type is installed 1 Ensure proper jumper in...

Page 149: ...lus Rear View and Jumper Settings FIGURE 9 7 SunCD 4 Drive Rear View and Jumper Settings 2 Place the CD ROM drive above the drive bracket slots SCSI data interface connector 4 2 1 ID select DC input P...

Page 150: ...ROM drive b Push the CD ROM drive down and toward the center of the unit so that the drive is properly seated in the drive bracket 4 Detach the wrist strap and replace the cover See Chapter 7 5 Power...

Page 151: ...ee Chapter 7 Caution Use proper ESD grounding techniques when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before p...

Page 152: ...l from the chassis FIGURE 9 10 CD ROM Drive Filler Panel 5 Place the screwdriver tip into the drive bracket slot next to a diskette grommet Use the screwdriver as a lever to move a diskette grommet fo...

Page 153: ...Chapter 9 Storage Devices 129 FIGURE 9 11 Diskette Drive Power Cable 8 Disconnect the diskette drive data cable FIGURE 9 12 Disk drive power cable P4...

Page 154: ...RE 9 12 Diskette Drive Data Cable 9 Lift the diskette drive from the chassis place the diskette drive on an antistatic surface FIGURE 9 13 10 Remove the Phillips screws and grommets set screws and gro...

Page 155: ...E 9 13 Removing the Diskette Drive FIGURE 9 14 Installing Grommets and Setting the Diskette Drive Switch Diskette drive Diskette drive power cable Diskette drive data cable Diskette drive mounts Diske...

Page 156: ...re set aside in Step 4 of Removing a Diskette Drive on page 127 2 Set the diskette drive switch perform either Step 3a or Step 3b a If the diskette drive has a switch on the side of the drive set the...

Page 157: ...ed P4 Move the SCSI disk cable and the CD ROM drive power cable away from the diskette drive opening FIGURE 9 17 and FIGURE 9 17 FIGURE 9 17 Moving the SCSI Disk Cable and the CD ROM Drive Power Cable...

Page 158: ...to fully seat in the diskette drive mounts FIGURE 9 19 FIGURE 9 19 Installing the Diskette Drive Note The diskette drive data cable must be positioned between the diskette drive and the metal chassis...

Page 159: ...o the diskette drive in the following sequence a Connect P4 FIGURE 9 20 FIGURE 9 20 Connecting the Diskette Drive Power Cable Note The top faces up when connected to the drive b Connect the data cable...

Page 160: ...n page 124 or replace the CD ROM drive filler panel as follows a Align the filler panel such that the filler panel base is on top of the diskette drive filler panel FIGURE 9 22 b Verify that the two p...

Page 161: ...Chapter 9 Storage Devices 137 FIGURE 9 22 Installing the CD ROM Drive Filler Panel 6 Detach the wrist strap and replace the cover See Chapter 7 7 Power on the system See Chapter 6 Tab 2 Post 2...

Page 162: ...138 SPARCstation 20 Service Manual July 1996...

Page 163: ...An antistatic mat contains the cushioning needed to protect the underside components to prevent board flexing and to provide antistatic protection Handling System Boards and Assemblies Caution The sy...

Page 164: ...flexing observe the following precautions Hold the system board only by the edges Do not place the system board or any component of the system board SBus card MBus module SIMM or chip on a hard surfa...

Page 165: ...oard FRUs The following are system board FRUs DSIMM VSIMM NVSIMM AVB SBus card MBus module OpenBoot PROM NVRAM TOD SIMM slots SCSI data connector AVB Speaker LED connector DC power connector Diskette...

Page 166: ...1 provides procedures for removing and replacing these components See FIGURE 10 2 FIGURE 10 2 Exploded View of the System Board Auxiliary video board SBus card MBus module DSIMM Serial port jumpers NV...

Page 167: ...wide MBus module proceed as follows Removing a Single Wide MBus Module Caution Hot surface Avoid contact Surfaces are hot and may cause personal injury if touched 1 Remove power from the system See Re...

Page 168: ...removed is in the lower slot slot 0 remove the slot 1 MBus module first 5 Install the card extractor on the MBus module FIGURE 11 2 6 Holding each side of the card extractor pull the MBus module up un...

Page 169: ...tem Board and Component Replacement 145 FIGURE 11 2 Extractor Installation on a Single Wide MBus Module FIGURE 11 3 Removing a Single Wide MBus Module MBus module Hot surface Card extractor Hot surfac...

Page 170: ...le retainers to the unlocked position 2 Position the MBus module so that the MBus module connector faces the appropriate slot FIGURE 11 4 FIGURE 11 4 Installing a Single Wide MBus Module Caution A mod...

Page 171: ...ns 5 Lock the retainer arms over the edge of the MBus module FIGURE 11 5 FIGURE 11 5 MBus Module and SBus Card Retainers Removing a Double Wide MBus Module Caution Hot surface Avoid contact Surfaces a...

Page 172: ...MBus module retainers and the SBus card retainers closest to the MBus slot FIGURE 11 5 4 Remove the four screws and rectangular washers from the MBus module and the back panel FIGURE 11 6 Note Save t...

Page 173: ...e Caution Use proper ESD grounding techniques when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing it o...

Page 174: ...e back plate into the back panel slot FIGURE 11 9 Note A double wide MBus module installs and has a back plate like an SBus card The connector on the MBus module should face the appropriate MBus modul...

Page 175: ...he MBus module connector and press down firmly until the MBus module is fully inserted into the slot 4 Lock the retainers over the edge of the MBus module FIGURE 11 10 Note If the MBus module is not f...

Page 176: ...ystem See Removing Power from the System on page 45 2 Remove the cover and attach the wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling components Wear an antistatic...

Page 177: ...rd FIGURE 11 11 FIGURE 11 11 SBus Card Retainers 4 Remove the screws and washers from the SBus card back plate FIGURE 11 12 Note Save the screws and washers for later use FIGURE 11 12 SBus Card Back P...

Page 178: ...6 5 Insert the extractor into the SBus card FIGURE 11 13 or insert two extractors into double wide Sbus card FIGURE 11 14 FIGURE 11 13 Installing the Card Extractor FIGURE 11 14 Removing a Double Wide...

Page 179: ...15 shows a double wide SBus card being removed 7 Remove the card extractor from the SBus card as follows a Bend one leg of the extractor slightly to the outside until the hook clears the hole in the S...

Page 180: ...us product 3 If the SBus card has tabs on the back plate remove the two small Phillips screws that attach the adapter bracket to the back plate and remove the adapter bracket FIGURE 11 16 FIGURE 11 16...

Page 181: ...URE 11 18 show a double wide SBus card and a single wide SBus card respectively being installed FIGURE 11 17 Installing a Double Wide SBus Card FIGURE 11 18 Installing a Single Wide SBus Card Side vie...

Page 182: ...anel Note The back plate connector s may not align with other connectors in the back panel Caution Do not use force Align the card connector and slot properly or card pin damage may occur b Align the...

Page 183: ...ctive surface that is known as gold fingers Removing and installing all capacities and types of SIMMs DSIMM VSIMM NVSIMM is identical The following sections provide a brief discussion of DSIMMs VSIMMs...

Page 184: ...ution frame buffer that plugs into a memory slot located on the system board A maximum of two VSIMMs may be installed With two VSIMMs installed a maximum of six DSIMMs 384 Mbytes may be installed Note...

Page 185: ...a round non replaceable battery mounted on one side The NVSIMM plugs into a memory slot located on the system board FIGURE 11 25 shows the battery side of the NVSIMM FIGURE 11 24 NVSIMM Battery Side...

Page 186: ...er and attach the wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive compone...

Page 187: ...ng box Verify that a SIMM is in an antistatic bag and an antistatic wrist strap is supplied After unpacking the contents of the shipping box store the shipping box and packing material for future use...

Page 188: ...rom a different Sun system and install it in a SPARCstation 20 system The SPARCstation 20 NVSIMM can only be used on systems executing the Solaris 2 3 SunOS 5 3 operating environment or later and Pres...

Page 189: ...move the jumper Any data in the NVSIMM memory will be lost if the jumper is moved 6 If installing an NVSIMM proceed as follows FIGURE 11 29 a Turn on the battery b Locate the jumper on the battery sid...

Page 190: ...e NVSIMM in the Slot Back View Note The notched part of the NVSIMM should be near the center of the system board Caution Use care when aligning the NVSIMM center notch with the connector frame If the...

Page 191: ...l of each hand on each side of the insertion tool pushing surface Press firmly with both hands on the tool until the SIMM snaps into place Note When installing a VSIMM in slot J0305 an AVB must also i...

Page 192: ...1 Remove power from the system See Removing Power from the System on page 45 2 Remove the cover and attach the wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling compo...

Page 193: ...Chapter 11 System Board and Component Replacement 169 FIGURE 11 33 AVB Installed FIGURE 11 34 Removing the AVB AVB AVB AVB Back panel connector slot...

Page 194: ...lot 2 Install the AVB as follows FIGURE 11 35 a Insert the back edge of the AVB between the tabs on the back panel b Push the AVB connector into the slot c Hold the corners of the AVB d Press down fir...

Page 195: ...at Store ESD sensitive components in antistatic bags before placing it on any surface 3 Remove the following MBus modules see MBus Module on page 143 SBus cards see SBus Card on page 152 SIMMs see DSI...

Page 196: ...iskette SCSI DC Power and Speaker LED Connectors 5 At the chassis rear loosen the lower two captive screws FIGURE 11 37 FIGURE 11 37 System Board Captive Screws Speaker LED connector SCSI DC power con...

Page 197: ...tistatic surface Note If a captive screw is in the upper right corner of the system board back panel remove the screw by backing it out of the plastic back panel cover This screw will be needed to sec...

Page 198: ...rt jumpers are preset to RS 423 mode but are changeable to RS 232 mode for connection to an X 25 network in Europe or Australia To change the setting of serial port jumpers J0801 and J0802 from the RS...

Page 199: ...ack of the chassis so that the SIMM slots are facing the drive siderails and the chassis front 2 Lift the back edge of the system board slightly ensuring that the foot on the underside of the system b...

Page 200: ...168 SIMMs see DSIMMs VSIMMs and NVSIMMs on page 159 SBus cards see SBus Card on page 152 MBus modules see MBus Module on page 143 FIGURE 11 41 System Board Captive Screws Note It is not necessary to r...

Page 201: ...r and Speaker LED Connectors OpenBoot PROM To remove and install an OpenBoot PROM proceed as follows Note It is not necessary to transfer the OpenBoot PROM from an existing system board to a replaceme...

Page 202: ...hniques when handling components Wear an antistatic wrist strap and use an ESD protected mat Store ESD sensitive components in antistatic bags before placing it on any surface 3 Remove any SBus cards...

Page 203: ...ny surface 1 Hold the OpenBoot PROM by the edges and align the notch on the OpenBoot PROM with the notch on the socket FIGURE 11 44 Caution Do not touch the OpenBoot PROM pins 2 Align the OpenBoot PRO...

Page 204: ...e power from the system See Removing Power from the System on page 45 2 Remove the cover and attach the wrist strap See Chapter 7 Caution Use proper ESD grounding techniques when handling components W...

Page 205: ...s on the NVRAM TOD carrier and pull up on the carrier to extract the NVRAM TOD 6 Place the NVRAM TOD on an antistatic surface Installing a NVRAM TOD Caution Use proper ESD grounding techniques when ha...

Page 206: ...erly FIGURE 11 46 FIGURE 11 46 NVRAM TOD Orientation 3 Push the NVRAM TOD carrier into the socket Note Press down firmly until the pins are seated in the socket 4 Replace any SBus cards removed earlie...

Page 207: ...authorized Sun sales representative or service provider to confirm a part number prior to ordering a replacement part Replacement Parts List The following table lists the FRUs and associated part numb...

Page 208: ...1867 HS21 125 MHz hyperSPARC 370 1865 SM151 150 MHz hyperSPARC 370 2162 Power supply 300 1279 644 Mbyte SCSI 2 SunCD 2Plus drive SunCD 2Plus drive type chassis 540 2500 644 Mbyte SCSI 2 SunCD 4 drive...

Page 209: ...type chassis 530 2279 Speaker LED cable SunCD 2Plus drive type chassis 530 2080 Speaker LED cable SunCD 4 CD ROM drive type chassis 530 2291 Fan cable 530 2159 SCSI data cable SunCD 2Plus drive type...

Page 210: ...ly 1996 FIGURE 12 1 Selected FRUs Diskette drive bottom MBus module slots Power supply CD ROM drive top DSIMM module slots SBus card slots AVB slot NVRAM TOD OpenBoot PROM System board Hard disk drive...

Page 211: ...FIGURE 12 2 SPARCstation 20 System Exploded View Diskette drive Diskette cable Diskette Power DC power harness SCSI data cable Speaker LED cable Disk panel filler Chassis External power cord Fan CD R...

Page 212: ...anual July 1996 FIGURE 12 3 Major Components of the System Board SBus card MBus module DSIMM module VSIMM or NVSIMM module Clock speed jumper Serial port jumpers OpenBoot PROM NVRAM TOD AVB Note NVRAM...

Page 213: ...Chapter 12 Illustrated Parts Breakdown 189 FIGURE 12 4 Standard External Cables External power cable Twisted pair Ethernet cable Video cable Keyboard cable Microphone and cable...

Page 214: ...tation 20 Service Manual July 1996 FIGURE 12 5 Optional External Cables A B IBM parallel printer cable Serial port Y breakout cable SCSI cable Thick Ethernet AUI adapter cable Centronics parallel prin...

Page 215: ...ABLE A 1 lists the physical specifications for the SPARCStation 20 system TABLE A 1 Physical Specifications Component Height inches mm Width inches mm Depth inches mm Net Weight lbs kg System unit 3 0...

Page 216: ...AC or 200 240 VAC Maximum current 2 A at 100 V system unit 1 A at 200 V system unit 4 A at 100 V auxiliary output 2 A at 200 V auxiliary output 6 A at 100 V total maximum 3 A at 200 V total maximum Ma...

Page 217: ...0 Hz or 60 Hz nominal Nominal voltage range 100 to 120 VAC or 200 to 240 VAC Typical operating current 1 7 A at 110 VAC 0 85 A at 220 VAC Standby power 5 W Typical operating power 125 W Maximum curren...

Page 218: ...ons for the SPARCStation 20 system TABLE A 5 Environmental Specifications Operating Environment Temperature range 32 F to 104 F 0 C to 40 C Humidity 93 RH at 104 F 40 C Altitude range 0 to 10 000 feet...

Page 219: ...yte 32 Mbyte and 64 Mbyte Additionally the SPARCstation 20 system supports up to two VSIMMs or one VSIMM and one NVSIMM The VSIMM output is provided through the 13W3 connector that is built into the b...

Page 220: ...in which case a maximum of three SBus cards may be installed Main Memory DSIMM eight maximum VSIMM two maximum in conjunction with up to six DSIMMs NVSIMM one maximum in conjunction with a second VSI...

Page 221: ...ide variety of I O options can be used with SBus cards such as graphic displays Ethernet printers and serial parallel controllers Floppy 82077 85C30 85C30 TOD EEPROM MBus SEC SBus SCSI connector Audio...

Page 222: ...cache coherency protocol In the SPARCstation 20 system the MBus module can automatically switch from a 40 MHz frequency to a 50 MHz frequency depending on the type of MBus module installed Changing ju...

Page 223: ...available DSIMM memory capacities based upon possible memory allocations are as follows Eight DSIMMs zero VSIMMs zero DVSIMMS 8 x 64 Mbytes or 512 Mbytes Seven DSIMMS with one VSIMM or one DVSIMM 7 x...

Page 224: ...Mbyte DSIMM configurations Install patch 101318 34 available from your local Answer Center if additional DSIMMs are installed to create one of the following memory combinations One 32 Mbyte DSIMM and...

Page 225: ...eo buffer chip VBC and a digital to analog converter DAC There is also pixel clock generation circuitry on the VSIMM The SPARCstation 20 uses 60 nanosecond VRAMs on the VSIMM VRAM densities are suppor...

Page 226: ...available NVSIMM memory capacities based upon possible memory allocations is 2 Mbytes SBus to SCSI Ethernet and Parallel Interfaces The SBus to SCSI Ethernet and parallel interface MACIO ASIC provide...

Page 227: ...ng Serial port chips 2 Audio chip Diskette drive controller 4 Mbit EEPROM NVRAM TOD chip LED interface One of the serial port chips provides serial ports A and B The second serial port chip provides t...

Page 228: ...two MBus modules 8 total One for the scalable memory controller SMC One for the MBus to SBus interface MSBI One for each pair of the eight memory SIMMs 4 total One for the SBus to external bus interfa...

Page 229: ...panel connectors TABLE C 1 through TABLE C 8 lists connector pin assignments and signal descriptions An illustration of each connector is also provided Parallel Connector TABLE C 1 lists connector pi...

Page 230: ...Bit 3 6 Data Bit 4 I O 24 mA OC Data Bit 4 7 Data Bit 5 I O 24 mA OC Data Bit 5 8 Data Bit 6 I O 24 mA OC Data Bit 6 9 Data Bit 7 I O 24 mA OC Data Bit 7 10 Ack I TTL Data acknowledge 11 Busy I TTL B...

Page 231: ...I Connector 23 Shield None GND Shield 24 Shield None GND Shield 25 Shield None GND Shield 26 Shield None GND Shield TABLE C 2 AUI Connector Pin Assignments Pin Function I O Level Signal Description 1...

Page 232: ...cted 14 AUI_DO O Analog Data out positive 15 AUI_DI_ I Analog Data out negative 16 AUI_CI I Analog AUI collision positive 17 Ground None GND Ground 18 N C None GND Not connected 19 N C None GND Not co...

Page 233: ...FIGURE C 3 Keyboard and Mouse Connector TABLE C 3 Keyboard Mouse Connector Pin Assignments Pin Function I O Level Signal Description 1 Ground O GND Ground 2 Ground O GND Ground 3 5 VDC O VCC Power 4 M...

Page 234: ...it Data A O RS 232 423 Xmit data A transmit data port A 3 Rec Data A I RS 232 423 Receive data port A 4 RTS A O RS 232 423 Request to send port A 5 CTS A I RS 232 423 Clear to send port A 6 DSR A I RS...

Page 235: ...a port B 17 RTxC A I RS 232 423 Secondary transmit clock receive port 18 TRxC B I RS 232 423 Receive transmit clock port B pullup 19 RTS B O RS 232 423 Request to send port B 20 DTR A O RS 232 423 Dat...

Page 236: ...wisted pair transmit data 2 TPO O Analog Differential twisted pair transmit data 3 TPI I Analog Differential twisted pair receive data 4 N C None GND Not connected 5 N C None GND Not connected 6 TPI I...

Page 237: ...und 14 Ground None GND Ground 15 Ground None GND Ground 16 Ground None GND Ground 17 Ground None GND Ground 18 Ground None GND Ground 19 Ground None GND Ground 20 Ground None GND Ground 21 Ground None...

Page 238: ...ata parity 35 Ground None GND Ground 36 Ground None GND Ground 37 Ground None GND Ground 38 Termpower I O TTL Termination voltage 39 Ground None GND Ground 40 Ground None GND Ground 41 atn O TTL Atten...

Page 239: ...tor 49 req O TTL Request 50 io O TTL Input output Active low signal TABLE C 7 13W3 Connector Pin Assignments Pin Function I O Level Signal Description A1 Red O Analog Video A2 Green O Analog Video A3...

Page 240: ...D Composite sync 6 Hort Sync O TTL Horizontal sync 7 Serial Write O TTL Serial write 8 Sense 1 I TTL Sense 9 Sense 2 I TTL Sense 10 Ground None GND Ground TABLE C 8 Audio Port Signals Headphone Microp...

Page 241: ...Microphone Icon The microphone connector allows connection to the Sun Microphone II microphone FIGURE C 10 Audio Line Out Icon The audio line out connector allows connection to a stereophonic amplifi...

Page 242: ...218 SPARCstation 20 Service Manual July 1996...

Page 243: ...Assign each SCSI device on the SCSI chain a unique SCSI address Disk Drives TABLE D 1 lists SCSI device addresses for the Solaris 1 1 1 Version B operating environment TABLE D 2 lists SCSI device add...

Page 244: ...from 0 to 6 Note SCSI address 7 is reserved for the SCSI processor of the computer system or the SCSI host adapter card External tape drives 4 5 External CD ROM drive 6 Assign the external disk drive...

Page 245: ...tics from the ok prompt the system must be shut down in an orderly manner When the operating system or any other stand alone application is booted do not use the keyboard Stop L1 and a keys to halt th...

Page 246: ...essage test all The test all command tests all devices in the system that have a self test program Disks tapes and CDROMs are not tested by test all Tests are executed in the device tree the device tr...

Page 247: ...peration the seconds counter repeatedly increments from 0 to 59 until interrupted by pressing any key on the keyboard CODE EXAMPLE E 3 identifies the watch clock command output message CODE EXAMPLE E...

Page 248: ...terface may be connected at a time The system automatically selects which interface is connected and active The AUI port is first tested by transmitting data packets and checking for No Carrier or res...

Page 249: ...interfaces one at a time The watch net all command monitors Ethernet packets on all Ethernet interfaces installed in the system one at a time For example if an SBus Ethernet card is installed in one o...

Page 250: ...l the SCSI host adapters installed in the system The probe scsi all command returns the following information SCSI host adapter address in the system device tree SCSI device identification data SCSI a...

Page 251: ...egs parameter in NVRAM to determine the quantity of memory to test The default setting for the selftest megs parameter is 1 thus testing one megabyte of memory To change the amount of memory to test u...

Page 252: ...mmand identifies each module individually CODE EXAMPLE E 9 identifies the module info command output message for a uniprocessor CODE EXAMPLE E 10 identifies the module info command output message for...

Page 253: ...ROM Refers to the system board OpenBoot PROM chip This chip contains boot code and a Forth Monitor program The OpenBoot PROM is connected to the I O data bus Boot PROM diagnostics The diagnostic firmw...

Page 254: ...rror correcting code Ethernet A type of network hardware that allows communications between systems connected together by transceiver taps transceiver cables and a coaxial cable Forth A high level pro...

Page 255: ...s interface NVRAM Non volatile RAM NVSIMM Non volatile single in line memory module on board diagnostics Tests that allow you to test the network controller diskette drive system memory cache system c...

Page 256: ...ists of a video display and keyboard Used to type and display information A terminal may be connected to either of the RS 423 RS 232 serial interface ports on the backpanel of the SPARCstation 20 syst...

Page 257: ...gnments 207 auxiliary video board 168 AVB installed 169 installing 170 removing 168 169 B back panel audio ports 216 captive screws 90 100 104 icons 216 SBus slots 90 100 battery lithium 42 block diag...

Page 258: ...r SCSI 34 corner screw 49 cover removing 50 replacing 51 speaker 64 D data cable diskette drive 130 DC power connector SunCD 2Plus drive type chassis 89 99 SunCD 4 drive type chassis 94 104 harness 97...

Page 259: ...tatic 159 electrostatic discharge 42 ESD 40 environmental specifications 194 error disk drive 33 messages POST 23 parity 28 34 read 28 34 write 28 34 ESD 40 Ethernet interface 202 expansion unit disk...

Page 260: ...s drive type chassis 91 SunCD 4 drive type chassis 96 single wide MBus module 146 SBus card 157 speaker 66 subassemblies 55 system board 175 interior view of system 3 internal access 49 cables SunCD 2...

Page 261: ...ientation 180 removing 178 operating system requirements 6 Solaris 6 SunOS 6 optional CD ROM drive connector 74 external cables 190 options external 7 internal 6 SCSI 7 SX graphics 6 output voltage 29...

Page 262: ...CD 4 drive 125 related documentation xxii removing AVB 168 169 CD ROM drive 123 124 cover 50 DC power harness SunCD 2Plus drive type chassis 97 SunCD 4 drive type chassis 103 diskette drive 127 131 di...

Page 263: ...220 target ID 220 terminator 34 SCSI backplane removing 84 SEC ASIC 203 functional block diagram 204 selected FRUs 186 serial cable 19 port jumper RS 232 174 RS 423 174 jumpers 173 ports A and B conne...

Page 264: ...umper settings 125 rear view 125 SunCD 4 drive jumper settings 125 rear view 125 SunDiag system exerciser 11 14 SunOS 4 1 3_U1 6 5 3 6 SunVTS documentation 15 kernel 15 tty 16 user interface 15 SX gra...

Page 265: ...ard key LEDs 25 typical abbreviated POST error free message 19 POST error messages 23 POST progress message 18 typographic conventions xxii U uniprocessor module info command output message 228 UNIX c...

Page 266: ...242 SPARCstation 20 Service Manual July 1996 wrist strap attaching 50...

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