DEC DECstation 316+ Service Manual Download

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Troubleshooting

This chapter provides troubleshooting instructions for the
DECstation systems. It is divided into the following sections:

•

Special tools

•

Diagnostics

•

Normal power up

•

Troubleshooting procedures

•

Error codes and how to use them

•

Troubleshooting by symptom

•

Troubleshooting during system operation

•

Using the System Utilities diskette

For information about jumper settings, troubleshooting, and
servicing of the DEC EtherWORKS option board and related
network connections refer to the DEC EtherWORKS Service
Guide.

2.1 Special Tools

The special tools needed to troubleshoot the DECstation system
are given in Table 2–1.

2–1

Summary of Contents for DECstation 316+

Page 1: ...DECstation 316 320 325C 333C 425C Service Guide Order Number EK PC46A SV 002 Digital Equipment Corporation...

Page 2: ...ed peripherals may result in interference to radio and television reception This equipment generates and uses radio frequency energy and if not installed and used properly that is in strict accordance...

Page 3: ...er RSX dt MS DOS is a registered trademark of Microsoft Corporation Velcro is a trademark of VELCRO USA Inc IBM and IBM PC AT are registered trademarks of International Business Machines Corporation I...

Page 4: ......

Page 5: ...n Logic Board 1 7 1 4 2 DECstation 316 CPU Board 1 7 1 4 3 DECstation 325C CPU Board 1 7 1 4 4 DECstation 333C CPU Board 1 8 1 4 5 DECstation 320 CPU Board 1 8 1 4 6 DECstation 425C CPU Board 1 8 1 4...

Page 6: ...Occurring During System Operation 2 20 2 8 Using the System Utilities Diskette 2 21 2 8 1 Running the Setup Program 2 21 3 FRU Replacement 3 1 Introduction 3 1 3 1 1 Before Replacing FRUs 3 5 3 2 Repl...

Page 7: ...ut 1 4 3 1 Exploded View of DECstation Chassis 3 6 3 2 Exploded View of DECstation Main Logic Board and Options 3 7 3 3 Removing the DECstation System Cover 3 9 3 4 Replacing the Floppy Disk Drive 3 1...

Page 8: ...edures 2 13 2 6 Hard Disk and Diskette Drive Troubleshooting Procedures 2 16 2 7 Monitor Troubleshooting Procedures 2 17 3 1 DECstation Standard Field Replaceable Units 3 1 3 2 DECstation Optional Fie...

Page 9: ...kit Guide Organization The guide is organized as follows Chapter 1 provides an overview of the DECstation systems Chapter 2 details troubleshooting instructions Chapter 3 contains procedures for remov...

Page 10: ...316 the DECstation 320 the DECstation 325C the DECstation 333C and the DECstation 425 When information applies to a specific DECstation the full name is used The computer industry recognizes two open...

Page 11: ...s Guide ER PC463 UG DECstation 425C User s Guide ER PC465 UG DECstation 316 325C 333C Technical Reference Manual ER PC46Y AA DECstation 316 320 325C 333C Technical Reference Manual ER PC46Y DD DECstat...

Page 12: ...O or VMS mail to NEST ORDER Digital personnel may order documents with part numbers beginning with AA from Digital Equipment Corporation Digital Drive Westminster MA 01473 0471 Attn Attention Order Ad...

Page 13: ...puter It can be used as a standalone personal computer or as a node on a network to a VAX computer or another DECstation with network server software The DECstation runs Digital and other industry sta...

Page 14: ...CPU board with 16 MHz 80386 processor DECstation 316 20 MHz 80386 processor DECstation 320 25 MHz 80386 processor DECstation 325C 33 MHz 80386 processor DECstation 333C 25 MHz i486 processor DECstatio...

Page 15: ...System 20 Mbyte 40 Mbyte 120 or 105 Mbyte IDE hard disk drive 60 Mbyte streaming tape drive QIC 40 16 bit Video Graphics Array VGA adapter 8514 A Compatible Graphics adapter DEC EtherWORKS bus adapter...

Page 16: ...stem configurations 115 or 230 Vac These systems are available for customers who elect to purchase DECstation supported options separately and configure their own systems Additionally customers can or...

Page 17: ...at 120 Vac 60 Hz PC461 A2 Same as PC461 AA but with no power cord or keyboard PC461 A3 Same as PC461 A2 but the power supply is factory set at 240 Vac 50 Hz PC462 AA DECstation 325C 80386 25 MHz base...

Page 18: ...2 Same as PC463 AA but with the power supply factory set at 120 Vac 50 Hz PC463 A3 Same as PC463 A2 but with the power supply factory set at 240 Vac 50 Hz PC464 AA DECstation 320 80386 20 MHz base sys...

Page 19: ...power supply is factory set at 240 Vac 50 Hz 1 4 1 DECstation Main Logic Board The DECstation main logic board contains a floppy disk controller serial and parallel ports PS 2 style mouse port IDE dri...

Page 20: ...tion 425C contains a 25 MHz Intel i486 CPU chip and a socket for an optional 25 MHz WIETEK 4167 math coprocessor No external cache memory is provided on the DECstation 320 The Intel i486 CPU has an in...

Page 21: ...319 01 VGA monochromatic 14 international version 240 Vac 50 Hz with 640 x 480 resolution North Hemisphere IEC Plug PC4XV A4 30 32320 01 VGA monochromatic 14 international version 240 Vac 50 Hz with 6...

Page 22: ...monochromatic RGB 14 international version 240 Vac 50 Hz with 640 x 480 resolution North Hemisphere IEC Plug PC4XV B4 30 32316 01 VGA monochromatic RGB 14 international version 240 Vac 50 Hz with 640...

Page 23: ...run software written for any of the video standards on any supported monitor For example you can run monochrome or color software on supported DECstation color monitors The VGA also supports 132 colu...

Page 24: ...d and allow each DECstation to process numeric data faster Table 1 3 Math Coprocessors Model Number Description PC43P AA 20 MHz Intel 80387 coprocessor for the DECstation 320 also compatible with DECs...

Page 25: ...codes and how to use them Troubleshooting by symptom Troubleshooting during system operation Using the System Utilities diskette For information about jumper settings troubleshooting and servicing of...

Page 26: ...reconfigure the CPU when options are installed DECstation 320 Utilities Diskette 29 28852 01 Used to reconfigure the CPU when options are installed DECstation 325C Utilities Diskette 29 28101 01 Used...

Page 27: ...gle beep displays information about the operating system and gives the date prompt Note that the actual information displayed at this time depends on the system software 2 4 Troubleshooting Procedures...

Page 28: ...e of monitor Type of keyboard Type and number of disk drives Type and amount of memory Type of network adapter Type of mouse Type of disk adapter if on board disk adapter is disabled Type of video gra...

Page 29: ...monitor are on You can hear the fan running You can hear the hard disk spinning 5 If the system does not power up a Turn off power to the system unit and monitor b Unplug the system and monitor from t...

Page 30: ...system still does not boot remove all options and try to boot the system d Replace the Digital certified options one at a time and see if the system powers up and boots each time an option is replace...

Page 31: ...or or system or both are on This can cause damage to the system Always turn the monitor and system off then wait 20 seconds and disconnect the power cord before you remove the system unit cover Observ...

Page 32: ...p utility Configuration record bad Check the information entered with the Setup utility See the hard disk installation guide for configuration information Check the CMOS battery connection Clock chip...

Page 33: ...in progress or failure 1 2 1 Programmable Interval Timer test in progress or failure 1 2 2 DMA initialization test in progress or failure 1 2 3 DMA page register write read test failure 1 3 1 RAM ref...

Page 34: ...t D 2 4 3 1st 64K RAM chip or data line failure bit E 2 4 4 1st 64K RAM chip or data line failure bit F 3 1 1 Slave DMA register test in progress or failure 3 1 2 Master DMA register test in progress...

Page 35: ...02 Unexpected interrupt in protected mode 03 Unexpected SW interrupt at xxxx xxxx Type S hut off NMI R eboot other keys to continue 04 Memory tests terminated by keystroke 05 Memory yyyyy failure at x...

Page 36: ...25 No boot device available 26 Hard disk read failure 27 No boot sector on hard disk 28 Insert system diskette and Strike the F1 key to retry boot 29 I O card parity interrupt at xxxx xxxx Type S hut...

Page 37: ...ctive actions If the corrective action does not work and it is possible to run the Diagnose diagnostics use them to further isolate the problem and then replace the failing FRU Table 2 5 System Unit T...

Page 38: ...skette Using a diskette generated reset is not compatible with the Ethernet board Press Ctrl Alt Del at the same time a soft reset to properly reset the hardware then turn system power off and then on...

Page 39: ...oot from the diskette drive Diskette is not in the diskette drive Insert a diskette containing bootable system software Drive switch is set incorrectly Make sure the drive switch is set correctly Disk...

Page 40: ...d write problems Possible corrupted files Restore disk from back up files Hard disk works but produces extra characters or garbled text Hard disk is affected by static electricity Move system away fro...

Page 41: ...n replace the failing FRU Table 2 7 Monitor Troubleshooting Procedures Problem Possible Cause Corrective Action Monitor green LED is not on Monitor is not turned on Turn on the monitor and then the sy...

Page 42: ...itor and system off Disconnect the monitor from the system and wall Plug the monitor into an working wall outlet If the monitor LED does not turn on there is a problem with the monitor or monitor LED...

Page 43: ...ed for or is incompatible with the current settings of the VGA board Reconfigure the software for VGA or set the VGA jumper on the main logic board to a standard supported by your software See the sof...

Page 44: ...or faulty loading on the data bus See also Section 2 6 The problem occurs during hard disk drive access Check the hard disk drive including jumper and switch settings Check for loose drive cables Che...

Page 45: ...nytime the following occur The amount of memory in the system is changed Diskette drives are added or removed A different video display board is installed in the system The battery backed up date and...

Page 46: ...ys an option menu Select option 4 SETUP then press Enter 5 The monitor displays the Setup utility menu Follow the instructions on the bottom of the screen and select the correct system configuration t...

Page 47: ...ers Table 3 2 lists optional FRUs for the DECstations 316 320C 325C 333C and 425C and their part numbers Table 3 1 DECstation Standard Field Replaceable Units FRU Digital Part Number DECstation 325C m...

Page 48: ...2 01 Drive bay slide mounts 29 28098 01 0K memory board 20 32970 01 Keyboard adapter plug 29 28100 01 DECstation 320 utilities diskette 29 28852 01 DECstation 316 utilities diskette 29 28153 01 DECsta...

Page 49: ...Mbyte 100 ns SIMM Memory Kit 19 32975 01 1 2 Mbyte diskette drive 5 25 30 31071 01 360 Kbyte diskette drive 5 25 30 33156 01 16 bit SCSI adapter board AHA 1540 A 20 30945 01 16 bit SCSI adapter board...

Page 50: ...20 MHz Intel 80387 math coprocessor 19 34906 01 25 MHz WIETEK 4167 math coprocessor 19 34341 01 33 MHz Intel 80387 math coprocessor 19 30971 01 Keyboard 101 key enhanced MD 29 32503 01 Two Button Mou...

Page 51: ...NOTE Before disconnecting the DECstation from a network inform the system administrator that you are going to disconnect the ThinWire T connector from the computer Do not disconnect any cable or term...

Page 52: ...es how to remove and replace the various FRUs in the DECstation Figure 3 1 shows an exploded view of the DECstation chassis Figure 3 2 shows an exploded view of the DECstation main logic board and opt...

Page 53: ...FRU Replacement 3 7 LJ 1716 Figure 3 2 Exploded View of DECstation Main Logic Board and Options...

Page 54: ...uxilliary outlet of the DECstation 3 Disconnect the monitor cable from the system unit 4 Connect the cable from the new monitor to the system unit 5 Plug the power cord from the new monitor into the a...

Page 55: ...ower to the system unit and monitor 2 Disconnect all cables from the back of the system unit 3 Remove the three screws that secure the cover to the back of the system unit as shown 4 Remove the cover...

Page 56: ...unting screws that hold the drive in place and remove the drive 5 Set the switch on the replacement drive to match that of the removed drive 6 Install the replacement drive using the three mounting sc...

Page 57: ...acement 3 11 LJ 1584 Figure 3 4 Replacing the Floppy Disk Drive 3 2 5 1 Replacing An Optional Floppy Drive To remove or replace an optional floppy disk drive refer to the appropriate option installati...

Page 58: ...out of the slot connector 4 Install the new CPU board by performing the previous steps in reverse order 3 2 8 DECstation 325C 333C Math Coprocessor Replacement Replace the math coprocessor as follows...

Page 59: ...ement 3 13 6 Install the coprocessor in the socket by alternately pressing each end into the socket Do this until the coprocessor is firmly seated in the socket LJ 1717 Figure 3 5 DECstation 325C 333C...

Page 60: ...hile lifting the coprocessor out of the socket be careful not to damage the socket or bend any of the pins on the coprocessor 3 Before installing the new math coprocessor straighten any pins so they a...

Page 61: ...FRU Replacement 3 15 LJ 1718 Figure 3 6 DECstation 316 320 CPU Board...

Page 62: ...lifting the coprocessor out of the socket be careful not to damage the socket or bend any of the pins on the coprocessor 3 Before installing the new math coprocessor straighten any pins so they align...

Page 63: ...FRU Replacement 3 17 LJ 1791 Figure 3 7 DECstation 320 425C CPU Board...

Page 64: ...for use with 0K Memory Adapters If the system includes a second 0K Memory Adapter optional it must be installed in the front connector of slot 1 NOTE Early boards were factory installed in slot 1 and...

Page 65: ...FRU Replacement 3 19 LJ 1719A Figure 3 9 The 0K Memory Adapter With foil backing...

Page 66: ...retaining clips that hold the SIMM in place Figure 3 10 If the SIMM to be replaced is the bottom one in a pair it will be necessary to remove the top one first and then the bottom one 4 Move the SIMM...

Page 67: ...FRU Replacement 3 21 LJ 1588 Figure 3 10 SIMM Removal and Replacement...

Page 68: ...them 3 Remove the mounting screw that secures the option board to the chassis 4 Remove the board by pulling it up and out of the expansion slot connector 5 Configure the jumpers and switches on the ne...

Page 69: ...r supply Figure 3 12 4 Disconnect the power supply cables from the main logic board and disk drives 5 Remove the five mounting screws that hold the power supply in the system unit Separate the power s...

Page 70: ...3 24 FRU Replacement LJ 1739A Figure 3 11 Removing the Rear Bezel...

Page 71: ...FRU Replacement 3 25 LJ 1738A Figure 3 12 Removing the Power Supply...

Page 72: ...o the system do not disconnect the power cord from the system unit or ac outlet for at least 20 seconds 1 Remove the power supply and the fan power cable Section 3 2 13 2 Remove the fan by removing th...

Page 73: ...FRU Replacement 3 27 LJ 1737A Figure 3 13 Fan Removal and Replacement...

Page 74: ...m Section 3 2 13 4 Disconnect all cables connected to the main logic board and note their location and routing 5 Remove the mounting tray for floppy drive B by removing the two mounting screws that se...

Page 75: ...FRU Replacement 3 29 9 Install the new main logic board by reversing the steps used to remove the old board LJ 1720 Figure 3 14 Removing the Main Logic Board...

Page 76: ...er Replace the speaker by performing the reverse of these steps 3 2 17 Battery Replacement Replace the battery as follows 1 Remove the system cover Section 3 2 4 2 Disconnect the battery from the main...

Page 77: ...FRU Replacement 3 31 3 3 Jumper Locations and Configurations Figure 3 15 shows the location of the jumpers on the 425C CPU logic board LJ 1789 Figure 3 15 CPU Logic Board Jumper Location 425C...

Page 78: ...n Logic Board Jumper Settings for Rev C Boards Feature Description Jumper Setting Monitor type Selection by SETUP1 E11 and E12 Installed Color monitor E10 and E11 Installed Monochrome monitor E10 E11...

Page 79: ...Boards Feature Description Jumper Setting I O Recovery Enabled1 E8 and E9 Installed Disabled E8 and E9 No connection System timing 316 325C 1 E14 and E15 Installed E17 and E18 Installed E20 and E21 I...

Page 80: ...3 34 FRU Replacement LJ 1789 Figure 3 16 Rev C Main Logic Board Jumper Locations 316 325C 333C...

Page 81: ...and E4 No connection Diagnostics factory E3 and E4 Installed System Timing Reserved for factory use E6 and E7 Installed E9 and E10 Installed E14 and E15 Installed E17 and E18 Installed E19 and E20 Ins...

Page 82: ...E17 and E18 Installed E19 and E20 Installed E21 and E22 No connection E23 and E24 No connection E25 and E27 No connection E26 and E28 Installed E29 and E30 No connection E31 and E40 No connection E32...

Page 83: ...FRU Replacement 3 37 LJ 1721 Figure 3 17 Rev D Main Logic Board Jumper Locations 320 425C...

Page 84: ......

Page 85: ...able for options and may be distributed between the other slots as needed Table A 1 DECstation Base System Power Consumption Current 5 Volts Amps 12 Volts Amps 12 Volts Amps 12 Peak Amps DC Power VA A...

Page 86: ......

Page 87: ...l interface connector on the rear panel of the DECstation systems Table B 1 Parallel I O Port Connector Pin Number Function 1 Strobe 2 Data bit 0 3 Data bit 1 4 Data bit 2 5 Data bit 3 6 Data bit 4 7...

Page 88: ...18 to 25 Ground Table B 2 RS 232C Serial Port Connector Pin Number Function 1 Carrier detect 2 Receive data 3 Transmit data 4 Data terminal ready 5 Signal ground 6 Data set ready 7 Request to send 8 C...

Page 89: ...ideo 2 Green video 3 Blue video 4 Monitor ID bit 2 not used 5 Ground 6 Red return ground 7 Green return ground 8 Blue return ground 9 Key no pin 10 Sync return ground 11 Monitor ID bit 0 not used 12 M...

Page 90: ...B 4 Peripheral Interface NOTE Monochrome monitors use the green video for all video input and ignore the red and blue video NOTE A monochrome monitor does not use the monitor ID bits...

Page 91: ...ation actuator arm 3 23 DECstation power supply 3 23 floppy drive 3 10 hard disk drive 3 12 keyboard 3 8 main logic board 3 28 Field Replaceable Unit FRU Cont math coprocessor 3 12 3 14 3 16 monitor 3...

Page 92: ...erial Port Connector pin numbers and functions B 2 S Setup when to run 2 21 SIMM Removal 3 20 System utilities diskette language option menu 2 21 main menu 2 21 T Tools 2 1 troubleshooting blank scree...

Page 93: ...Index 3 troubleshooting Cont no start from floppy disk 2 16 preparation 2 3 procedure 2 4 system hang with coprocessor 2 14 tape does not work 2 14 V Video Port Connector pin numbers and functions B 3...

Page 94: ......

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