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DEC DECstation 316+ Service Manual

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DECstation
316
/ 320
/325
/333
/425
+
+
C
C
C
Service Guide
Order Number EK-PC46A-SV-002
Digital Equipment Corporation

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Summary of Contents for DEC DECstation 316+

  • Page 1 DECstation / 320 /325 /333 /425 Service Guide Order Number EK-PC46A-SV-002 Digital Equipment Corporation...
  • Page 2 First Edition, January 1990, Second Edition, October 1990 The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for any errors that may appear in this document.
  • Page 3 The following are trademarks of Digital Equipment Corporation: DIBOL UNIBUS DEC/CMS EduSystem DEC/MMS VAXcluster DECnet MASSBUS DECsystem–10 DECSYSTEM–20 DECUS RSTS DECwriter 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.

  • Page 5: Table Of Contents

    Contents About This Manual Overview Introduction ........1–1 DECstation Base System .
  • Page 6 iv Contents Troubleshooting Special Tools ........2–1 Diagnostics .
  • Page 7 Contents v 3.2.11 The 0K Memory Adapter ......3–18 3.2.11.1 Single-In-Line Memory Module Replacement ..3–20 3.2.12 Option Board Replacement .
  • Page 8 vi Contents 3–16 Rev. C Main Logic Board Jumper Locations (316 /333 ) ........3–34 3–17 Rev.

  • Page 9: About This Manual

    About This Manual This service guide is designed to help you diagnose and repair the DECstation 316+, DECstation 320 , DECstation , and DECstation 425 personal computers. This guide contains information on servicing the base system only. Specific information on installing, replacing, and configuring options is covered in the individual option installation guides supplied with those products, and is available to Customer Service personnel in a kit.

  • Page 10: Ordering Parts

    viii About This Manual Conventions This document uses the following conventions: Convention Meaning Warning Provides information to prevent personal injury Caution Provides information to prevent damage to equipment Note Provides general information you should be aware of Press and hold while you Ctrl Alt Del Ctrl...

  • Page 11: Related Documentation

    About This Manual ix To order parts by mail, send a purchase order to: Digital Equipment Corporation P.O. Box CS2008 Nashua NH 03061 Related Documentation The following related documents are available as supplements to the information provided in this guide. Document Part Number DECstation 316...
  • Page 12 x About This Manual Digital personnel may order documents with part numbers beginning with either ER or EK from: Digital Equipment Corporation 444 Whitney Street Northboro, MA 01532 Attn: Publishing and Circulation Services (NRO3/W3) Order Processing Section On-line orders can be sent ALL-IN-1 mail to Order @NRO or VMS mail to NEST::ORDER.

  • Page 13: Overview

    Overview 1.1 Introduction The DECstation (Figure 1–1) is a desktop computer. 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- standard applications.

  • Page 14: Decstation Base System

    1–2 Overview As a node on a Personal Computing System Architecture (PCSA) network, the DECstation is the user’s interface with the applications and services that the PCSA family of products provides. As part of a network, the DECstation communicates with other computers on the network and shares the various resources and services offered by Digital computers and servers.

  • Page 15: Decstation Options

    • 16-bit Video Graphics Array (VGA) adapter • 8514/A-Compatible Graphics adapter • DEC EtherWORKS bus adapter • A second 0K memory expansion adapter 1.3.1 System Unit Layout Figure 1–2 shows the location of both standard and optional equipment within the system unit. Standard, base system equipment is represented by solid lines.

  • Page 16: Decstation System Configurations

    1–4 Overview LJ-1714 Figure 1–2 System Unit Layout 1.4 DECstation System Configurations The DECstation personal computers are available in two base system 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 order one of several packaged systems which offer optional system memory configurations, mass storage devices, and video adapters installed at the factory.

  • Page 17: Base System Configurations

    Overview 1–5 The base system configurations are listed in Table 1–1. Table 1–1 Base System Configurations Model Number Description PC461-AA DECstation 316 ; 80386/16 MHz, base system box, 0K Memory Adapter with 1 Mbyte RAM (minimum), 3.5" 1.44 Mbyte floppy disk drive, on-board IDE device interface, serial/parallel port, mouse and keyboard port, 6 PC/AT expansion slots (4 full size;...
  • Page 18 1–6 Overview Table 1–1 (Cont.) Base System Configurations Model Number Description PC463-AA DECstation 333 ; 80386/33 MHz base system box, 0K Memory Adapter with 1 Mbyte RAM (minimum), 3.5" 1.44 Mbyte floppy disk drive, on-board IDE device interface, serial/parallel port, mouse and keyboard port, 6 PC/AT expansion slots (4 full size;...

  • Page 19: Decstation Main Logic Board

    Overview 1–7 Table 1–1 (Cont.) Base System Configurations Model Number Description PC465-AA DECstation 425 ; 80486/25 MHz, base system box, 0K Memory Adapter with 1 Mbyte RAM (minimum), 3.5" 1.44 Mbyte floppy disk drive, on-board IDE device interface, serial/parallel port, mouse and keyboard port, 6 PC/AT expansion slots (4 full size;...

  • Page 20: Decstation 333 Ccpu Board

    1–8 Overview 1.4.4 DECstation 333 CPU Board The CPU board of the DECstation 333 contains a 33 MHz Intel 80386 CPU chip, 32 Kbytes of cache memory, and a socket for an optional Intel 80387 math coprocessor. 1.4.5 DECstation 320 CPU Board The CPU board of the DECstation 320 contains a 20 MHz Intel...

  • Page 21: Monitors

    Overview 1–9 Table 1–2 Monitors Model Number Part Number Description PC4XV-AA 30-32317-01 VGA monochromatic 14" for all versions of DECstation personal computers. Requires PC4XG-AA or -AB VGA adapter, except on the PC44- models. Displays 64 shades of grey, 640 x 480 resolution. 120 Vac 60 Hz (US and Canada) PC4XV-A2 30-32317-02...
  • Page 22 1–10 Overview Table 1–2 (Cont.) Monitors Model Number Part Number Description PC4XV-BA 30-30901-01 VGA monochromatic RGB 14" for all versions of DECstation personal computers. Requires PC4XG-AA or -AB VGA adapter, except on the PC44- models, 120 Vac 60 Hz (US and Canada), with 640 x 480 resolution.

  • Page 23: Video Graphics Array Adapter

    Overview 1–11 1.4.9 Video Graphics Array Adapter The Video Graphics Array (VGA) adapter provides the video display control functions of the DECstation. The VGA adapter is available in 8-bit or 16-bit (800 x 600 resolution) models, and is also compatible with the following video standards. (Note: There is also a 16-bit VGA 1024 x 768 resolution model available).

  • Page 24: Lk250 Keyboard

    1–12 Overview 1.4.10.2 LK250 Keyboard The LK250 keyboard provides the standard Digital key arrangement available in several country-specific language variations. 1.4.11 Math Coprocessor The optional math coprocessors listed in Table 1–3 plug into the main logic board and allow each DECstation to process numeric data faster.

  • Page 25: Troubleshooting

    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.

  • Page 26: Diagnostics

    2–2 Troubleshooting Table 2–1 Troubleshooting Tools Tool Part Number Definition Diagnose 29-27462-01 These standalone diagnostics Diagnostics are available separately. For (Version 3.0) information about using these diagnostics, refer to the accompanying manual. Tri-wrap FD-10164-00 This triple connector consists Loopback of a male 25-pin parallel Connector loopback connector, a female 25-pin serial loopback...

  • Page 27: Normal Power Up

    Troubleshooting 2–3 2.3 Normal Power Up In a normal system power up the following takes place: 1. Power to the monitor and system unit is turned on. Both power indicators are on. 2. The system executes its power-up tests, displays the BIOS ROM version, assorted copyright information, and the memory size.

  • Page 28: System Does Not Boot

    2–4 Troubleshooting — If any new hardware options were added to the system around the time the problem started and if the options are Digital certified or third party — If any new software was added to the system 2. Have the customer supply you with a copy of the operating system diskette(s) that came with the system.
  • Page 29 Troubleshooting 2–5 2.4.2 No Power This procedure helps determine the cause of the problem when the DECstation does not power up. Before starting this procedure be sure you have done the steps in Section 2.4.1. 1. Check the system for loose cables and connections. 2.

  • Page 30: Power Up Beep Codes

    2–6 Troubleshooting 7. If the system powers up and boots refer to Section 2.4.4. 2.4.3 System Does Not Boot This procedure helps determine why the DECstation does not boot. Before starting this procedure be sure you have done the steps in Section 2.4.1. 1.
  • Page 31 Troubleshooting 2–7 2. Run the Diagnose diagnostics. 3. Replace the necessary FRU. 2.5 Error Codes and Messages During the power-up sequence, the DECstation executes built-in diagnostic and bootstrap routines. During the first portion of power up testing, the system generates beep codes on the speaker if the test program detects a fatal error.

  • Page 32: Primary Beep Codes

    2–8 Troubleshooting Table 2–2 Primary Beep Codes Possible Beep Code Problem Corrective Action Two short Keyboard Be sure the keyboard cable is firmly beeps failure connected. Hard disk Be sure the drive cables are firmly failure connected and all drive and adapter jumpers are set correctly.

  • Page 33: Secondary Beep Codes

    Troubleshooting 2–9 When several bursts of beeps are generated, listen carefully and remember the numeric beep code pattern. This pattern establishes the secondary level of beep codes. Table 2–3 lists the secondary beep codes and the test in-progress or test failure that corresponds to the numeric beep code pattern.
  • Page 34 2–10 Troubleshooting Table 2–3 (Cont.) Secondary Beep Codes Beep Code Description of Test or Failure 2-2-3 1st 64K RAM chip or data line failure - bit 6 2-2-4 1st 64K RAM chip or data line failure - bit 7 2-3-1 1st 64K RAM chip or data line failure - bit 8 2-3-2 1st 64K RAM chip or data line failure - bit 9...

  • Page 35: Test Messages

    Troubleshooting 2–11 2.5.2 Test Messages After screen initialization and verification, the built-in diagnostics send non-fatal error messages to video memory and the system displays the messages on the monitor. Table 2–4 lists the BIOS error numbers and the corresponding error messages that displays on the screen.
  • Page 36 2–12 Troubleshooting Table 2–4 (Cont.) BIOS Error Messages Error Number Error Message Invalid configuration information - please run SETUP program Time-of-day not set - please run SETUP program Keyboard is locked - please unlock Optional ROM bad checksum = xx Strike the F1 key to continue Diskette read failure - Not a boot diskette -...

  • Page 37: Troubleshooting By Symptom

    Troubleshooting 2–13 Table 2–4 (Cont.) BIOS Error Messages Error Number Error Message System halted! Must power down. 2.6 Troubleshooting by Symptom This section describes causes and corrective actions for minor system problems that you can fix. The troubleshooting procedures are separated into system unit, hard disk and diskette drives, monitor, and pointing device problems.
  • Page 38 2–14 Troubleshooting Table 2–5 (Cont.) System Unit Troubleshooting Procedures Problem Possible Cause Corrective Action Monitor is off. Turn on the monitor. Monitor cable Make sure the incorrectly installed. monitor cable is installed properly. Main logic board Make sure the VGA failure.
  • Page 39 Troubleshooting 2–15 Table 2–5 (Cont.) System Unit Troubleshooting Procedures Problem Possible Cause Corrective Action Tape does not work Tape is not fully Make sure the tape in the tape drive. inserted into the is fully inserted and tape drive. the cartridge release handle is locked down.

  • Page 40: Disk Related Problems

    2–16 Troubleshooting 2.6.2 Disk Related Problems Table 2–6 lists some common disk related problems, possible causes, and suggested corrective actions. If the corrective action does not work, run the Diagnose diagnostics to further isolate the problem and then replace the failing FRU. Table 2–6 Hard Disk and Diskette Drive Troubleshooting Procedures Problem...

  • Page 41: Monitor Problems

    Troubleshooting 2–17 Table 2–6 (Cont.) Hard Disk and Diskette Drive Troubleshooting Procedures Problem Possible Cause Corrective Action Diskette is worn or Try another damaged. diskette. 2.6.3 Monitor Problems Table 2–7 lists some common monitor problems, possible causes, and suggested corrective 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.
  • Page 42 2–18 Troubleshooting Table 2–7 (Cont.) Monitor Troubleshooting Procedures Problem Possible Cause Corrective Action Main logic board Replace the monitor. failure. If that doesn’t fix the problem make sure the VGA jumper is enabled on the main logic board. If it is enabled, replace the main logic board.
  • Page 43 Troubleshooting 2–19 Table 2–7 (Cont.) Monitor Troubleshooting Procedures Problem Possible Cause Corrective Action Screen display Monitor cable Straighten pins or distorted, rolling, connector pins bent replace the monitor. flickering, or wrong or broken. or uneven color. Electromagnetic Move any interference exists. electromechanical device away from the monitor or move the...

  • Page 44: Troubleshooting Problems Occurring During System Operation

    2–20 Troubleshooting 2.7 Troubleshooting Problems Occurring During System Operation Sometimes problems occur during system operation. Use the following list to help isolate a problem to a specific subsystem by determining how or when the problem occurs. The problem occurs during diskette drive access. •...

  • Page 45: Using The System Utilities Diskette

    Troubleshooting 2–21 The problem seems to be heat related. • Make sure there is sufficient air flow around the system. • The system unit may be clogged with dust. 2.8 Using the System Utilities Diskette The menu driven System Utilities diskette (shipped with the system and required as a Customer Service tool) must be used when options are added to the system.
  • Page 46 2–22 Troubleshooting • Expansion memory size (displayed on the screen at power-up). • Primary video adapter type (VGA). • CPU and BUS clock speeds. CPU speed is the CPU processing speed, and BUS speed is the I/O expansion bus transmission speed. The Setup utility is run as follows: 1.

  • Page 47: Fru Replacement

    FRU Replacement 3.1 Introduction This chapter contains procedures for removing and replacing each DECstation field replaceable unit (FRU). To install many of the FRUs, perform the reverse of the procedure when it is so noted. Only qualified service technicians should remove and replace FRUs.

  • Page 48: Decstation Optional Field Replaceable Units

    3–2 FRU Replacement Table 3–1 (Cont.) DECstation Standard Field Replaceable Units Digital Part Number 200W power supply w/IEC assembly 29-28118-01 Fan assembly 29-28093-01 Rear bezel 29-28094-01 Card guide 29-28095-01 Speaker assembly 29-27440-01 Front cover assembly 29-28677-01 Actuator arm with LED assembly 29-28096-01 Battery 29-27439-01...
  • Page 49 FRU Replacement 3–3 Table 3–2 (Cont.) DECstation Optional Field Replaceable Units Digital Part Number 14" Color monitor 120V South Hem 30-32314-01 14" Color monitor 240V North Hem 30-32315-01 14" Color monitor 240V South Hem 30-32316-01 14" Color monitor 120V North Hem 30-32317-01 14"...
  • Page 50 3–4 FRU Replacement Table 3–2 (Cont.) DECstation Optional Field Replaceable Units Digital Part Number 2400 BPS integral modem 30-31072-01 1200/200 BPS integral modem 30-31073-01 16 MHz Intel 80387 math coprocessor 19-30950-01 25 MHz Intel 80387 math coprocessor 19-30972-01 20 MHz Intel 80387 math coprocessor 19-34906-01 25 MHz WIETEK 4167 math coprocessor 19-34341-01...

  • Page 51: Before Replacing Frus

    FRU Replacement 3–5 3.1.1 Before Replacing FRUs The following criteria apply when removing or installing DECstation FRUs. CAUTION After you turn power off to the system, do not disconnect the power cord from the system unit or wall outlet for at least 20 seconds.

  • Page 52: Replacing Frus

    3–6 FRU Replacement 3.2 Replacing FRUs This section describes 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 options. LJ-1715 Figure 3–1 Exploded View of DECstation Chassis...

  • Page 53: Exploded View Of Decstation Main Logic Board And Options

    FRU Replacement 3–7 LJ-1716 Figure 3–2 Exploded View of DECstation Main Logic Board and Options...

  • Page 54: Keyboard Replacement

    3–8 FRU Replacement 3.2.1 Keyboard Replacement Replace the keyboard as follows: 1. Turn off power to the system unit and monitor. 2. Disconnect the keyboard cable from the system unit. 3. Connect the cable from the new keyboard to the system unit. 4.

  • Page 55: System Cover Removal

    FRU Replacement 3–9 3.2.4 System Cover Removal Remove the system cover as follows: 1. Turn off power 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.

  • Page 56: Floppy Disk Drive Replacement

    3–10 FRU Replacement 3.2.5 Floppy Disk Drive Replacement Replace the floppy disk drive as follows (Figure 3–4): 1. Remove the system cover (Section 3.2.4). 2. Remove the actuator arm (Figure 3–12). 3. Remove the ribbon cable from the back of the drive. 4.

  • Page 57: Replacing An Optional Floppy Drive

    FRU Replacement 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 installation guide.

  • Page 58: Replacing An Optional Hard Disk/Tape Drive

    3–12 FRU Replacement 3.2.6 Replacing an Optional Hard Disk/Tape Drive To remove or replace an optional hard disk or tape drive, refer to the appropriate option installation guide. 3.2.7 CPU Board Replacement Replace the DECstation CPU board as follows: 1. Locate the CPU board within the DECstation chassis (Figure 3–5 for the DECstation 325 and DECstation 333 see Figure 3–6 for the DECstation 316+, or Figure 3–7 for the...

  • Page 59: Decstation 325 C / 333 Ccpu Board

    FRU Replacement 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 325 / 333 CPU Board...

  • Page 60: Decstation 316 + / 320 + Math Coprocessor Replacement

    3–14 FRU Replacement 3.2.9 DECstation 316 / 320 Math Coprocessor Replacement Replace the math coprocessor as follows: 1. Locate the math coprocessor on the DECstation 316 CPU board (Figure 3–6). 2. Remove the coprocessor using a small, flat-blade screwdriver to alternately lift each end. While lifting the coprocessor out of the socket be careful not to damage the socket or bend any of the pins on the coprocessor.

  • Page 61: Decstation 316 + /320 + Cpu Board

    FRU Replacement 3–15 LJ-1718 Figure 3–6 DECstation 316 /320 CPU Board...

  • Page 62: 425 C Math Coprocessor Replacement

    3–16 FRU Replacement 3.2.10 425 Math Coprocessor Replacement Replace the math coprocessor as follows: 1. Locate the math coprocessor on the DECstation 425 board (Figure 3–7). 2. Remove the coprocessor using a small, flat-blade screwdriver to alternately lift each end. While lifting the coprocessor out of the socket be careful not to damage the socket or bend any of the pins on the coprocessor.

  • Page 63: Decstation 320

    FRU Replacement 3–17 LJ-1791 Figure 3–7 DECstation 320 /425 CPU Board...

  • Page 64: The 0K Memory Adapter

    3–18 FRU Replacement 3.2.11 The 0K Memory Adapter One 0K Memory Adapter is included as standard equipment with each DECstation, and is installed in the front connector of slot 2 (Figure 3–8). NOTE The front connectors of both slot 1 and slot 2 are dedicated for use with 0K Memory Adapters.

  • Page 65: The 0K Memory Adapter (With Foil Backing)

    FRU Replacement 3–19 LJ-1719A Figure 3–9 The 0K Memory Adapter (With foil backing)

  • Page 66: Single-In-Line Memory Module Replacement

    3–20 FRU Replacement 3.2.11.1 Single-In-Line Memory Module Replacement Replace the Single-In-Line Memory Modules (SIMMs) as follows: 1. Remove the system cover (Section 3.2.4). 2. Remove the 0K memory adapter from the system by first removing the mounting screw that secures it to the chassis, and then pulling the board up and out of the slot connector.
  • Page 67 FRU Replacement 3–21 LJ-1588 Figure 3–10 SIMM Removal and Replacement...

  • Page 68: Option Board Replacement

    3–22 FRU Replacement 3.2.12 Option Board Replacement The procedure for replacing an option board in the DECstation is similar for the different options in the system. 1. Remove the system cover (Section 3.2.4). 2. Note the position of any cables connected to the option board and disconnect them.

  • Page 69: Power Supply Removal

    FRU Replacement 3–23 3.2.13 Power Supply Removal Remove the DECstation power supply as follows: CAUTION After you turn power off to the system, do not disconnect the power cord from the system unit or ac outlet for at least 20 seconds. 1.
  • 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: Fan Removal

    3–26 FRU Replacement 3.2.14 Fan Removal Remove the DECstation fan assembly as follows: CAUTION After you turn power off to the system, do not disconnect the power cord from the system unit or ac outlet for at least 20 seconds. 1.
  • Page 73 FRU Replacement 3–27 LJ-1737A Figure 3–13 Fan Removal and Replacement...

  • Page 74: Main Logic Board Replacement

    3–28 FRU Replacement 3.2.15 Main Logic Board Replacement Replace the main logic board as follows: NOTE DECstations 316+/325 /333 were introduced with a Rev C main logic board (Figure 3–16) Later models may be equipped with a Rev D main logic board). DECstations 320 /425 have a Rev D main logic board...
  • 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: Speaker Removal

    3–30 FRU Replacement 3.2.16 Speaker Removal Remove the speaker as follows: 1. Remove the system cover (Section 3.2.4). 2. Disconnect the speaker cable from the main logic board (Figure 3–2). 3. Remove the two screws securing the speaker to the front of the chassis.

  • Page 77: Jumper Locations And Configurations

    FRU Replacement 3–31 3.3 Jumper Locations and Configurations Figure 3–15 shows the location of the jumpers on the 425 logic board. LJ-1789 Figure 3–15 CPU Logic Board Jumper Location (425...

  • Page 78: Rev C Boards

    3–32 FRU Replacement Figure 3–16 shows the location of the jumpers on the 316+, 325c, 333c main logic boards. Table 3–3 describes main logic board jumpers configurations, and provides a recommended default setting for the jumpers. Figure 3–17 shows the location of the jumpers on the 320 main logic boards.
  • Page 79 FRU Replacement 3–33 Table 3–3 (Cont.) DECstation 325 /316 Main Logic Board Jumper Settings for Rev C Boards Feature Description Jumper Setting I/O Recovery Enabled E8 and E9, Installed Disabled E8 and E9, No connection System timing / 325 E14 and E15, Installed E17 and E18, Installed E20 and E21, Installed E13 and E14, Installed...

  • Page 80: Rev. C Main Logic Board Jumper Locations

    3–34 FRU Replacement LJ-1789 Figure 3–16 Rev. C Main Logic Board Jumper Locations (316 /333...

  • Page 81: Rev D Boards

    FRU Replacement 3–35 Table 3–4 DECstation 425 /320 Main Logic Board Jumper Settings for Rev D Boards Feature Description Jumper Setting Monitor type Selection by SETUP E11 and E12, Installed Color monitor E12 and E13, Installed Monochrome monitor E11, E12, and E13, No connection IDE IOCHRDY Enabled...
  • Page 82 3–36 FRU Replacement Table 3–4 (Cont.) DECstation 425 /320 Main Logic Board Jumper Settings for Rev D Boards Feature Description Jumper Setting E6 and E7, Installed E9 and E10, Installed E15 and E16, Installed E17 and E18, Installed E19 and E20, Installed E21 and E22, No connection E23 and E24, No...

  • Page 83: Rev. D Main Logic Board Jumper Locations (320 + / 425 C )

    FRU Replacement 3–37 LJ-1721 Figure 3–17 Rev. D Main Logic Board Jumper Locations (320...

  • Page 85: Power Consumption

    Power Consumption The following table lists the power consumption for the DECstation base system. NOTE The reserve current row indicates the amount of current that is available for options and may be distributed between the other slots as needed. Table A–1 DECstation Base System Power Consumption Power Volts Volts...

  • Page 87: B–1 Parallel I/O Port Connector

    Peripheral Interface The following tables list the pin assignments and function of each peripheral interface connector on the rear panel of the DECstation systems. Table B–1 Parallel I/O Port Connector Pin Number Function Strobe Data bit 0 Data bit 1 Data bit 2 Data bit 3 Data bit 4...

  • Page 88: Peripheral Interface

    B–2 Peripheral Interface Table B–1 (Cont.) Parallel I/O Port Connector Pin Number Function Error Initialize Select In 18 to 25 Ground Table B–2 RS-232C Serial Port Connector Pin Number Function Carrier detect Receive data Transmit data Data terminal ready Signal ground Data set ready Request to send Clear to send...

  • Page 89: B–4 Video Port Connector

    Peripheral Interface B–3 Table B–3 (Cont.) Keyboard and Mouse Connectors Pin Number Function Clock Reserved Table B–4 Video Port Connector Pin Number Function Red video Green video Blue video Monitor ID bit 2 (not used) Ground Red return (ground) Green return (ground) Blue return (ground) Key (no pin) Sync return (ground)
  • 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 Index Field Replaceable Unit (FRU) (Cont.) math coprocessor, 3–12, 3–14, 3–16 monitor, 3–8 Battery disposal, 3–30 mouse, 3–8 Beep Codes, 2–7 option board, 3–22 BIOS Error Messages, 2–11 SIMMs, 3–20 speaker, 3–30 system cover, 3–9 tape drive, 3–12 CPU/BUS speeds, 2–22 How to run Setup, 2–21 DECstation actuator arm, removal of, 3–23...
  • Page 92 2 Index LK250 Keyboard, 1–12 Setup when to run, 2–21 SIMM Removal, 3–20 System utilities diskette language option menu, 2–21 Main Logic Board main menu, 2–21 exploded view, 3–6 removal, 3–28 Math Coprocessor replacement of coprocessor on DECstation 316+, 3–14 Tools, 2–1 replacement of coprocessor on troubleshooting...

  • Page 93: Video Port Connector

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

This manual is also suitable for:

Decstation 325cDecstation 333cDecstation 320+Decstation 425c

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