DEC DECpc LP DEC DECpc LP Manual

Download

Service

Maintenance

Manual

DECpc LP

K-MN-SD00000-21-JG00.A

MCS LOGISTICS

ENGINEERING

NIJMEGEN

THE NETHERLANDS

March 1996

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 might appear in this document. The software, if any, described in this document is furnished under a license and may be used or copied only in accordance with the terms of such license. No responsibility is assumed for the use or reliability of software or equipment that is not supplied by Digital Equipment Corporation or its affiliated companies. Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS

252.227-7013.

The following are trademarks of Digital Equipment Corporation: DECpc and the Digital logo.

The following are third party trademarks: MS-DOS and Windows and Windows NT and Windows NT Server are trademarks of Microsoft Corp. Novell and Netware are trademarks of Novell, Inc. SCO and Open Desktop are trademarks of The Santa Cruz Operation, Inc. UNIX is a registered trademark of UNIX System Laboratories, Inc. All other trademarks and registered trademarks are the property of their respective holders.

Created by: MCS Logistics Engineering - Nijmegen

Printed in Ireland

Digital DECpc LP Table of Contents

REVISION HISTORY........................................................................................................................................7

PREFACE..............................................................................................................................................................9

CHAPTER 1 PRODUCT DESCRIPTION ..................................................................................................11

PRODUCT INTRODUCTION ...................................................................................................................................11

PRODUCT MODELS INFORMATION .....................................................................................................................12

DECpc LP Models Information.....................................................................................................................12

CHAPTER 2 SYSTEM UTILITIES & CONFIGURATION....................................................................13

SYSTEM UTILITIES ...............................................................................................................................................13

DISKETTE 1: SYSTEM AND VGA UTILITIES.......................................................................................................13

Using the System and VGA Utilities Diskette..............................................................................................14

Running SETUP.COM...................................................................................................................................14

SMODE.EXE..................................................................................................................................................15

KP.EXE............................................................................................................................................................15

Setting a Keyboard and Mouse Password.....................................................................................................16

DISKETTE 1: WINDOWS 3.0/3.1 DRIVERS ..........................................................................................................16

DISKETTE 2: WINDOWS 3.0/3.1 DRIVERS ..........................................................................................................16

CONFIGURING THE COMPUTER...........................................................................................................................17

Running the BIOS Setup Utility ....................................................................................................................17

BIOS SETUP UTILITY OPTIONS ..........................................................................................................................18

CHAPTER 3 SERVICE PROCEDURES.....................................................................................................23

SAFETY REQUIREMENTS .....................................................................................................................................23

RECOMMENDED TOOLS .....................................................................................Error! Bookmark not defined.

Other Materials Needed..................................................................................................................................24

Special Tools Required...................................................................................................................................24

Remedial Diagnostic Test Software...............................................................................................................24

Recommended Virus Detection and Cleanup Software...............................................................................24

ECO/FCO INFORMATION ....................................................................................................................................25

BIOS Version Information.............................................................................................................................25

UNLOCKING AND REMOVING COVER.................................................................................................................26

COMPUTER COMPONENTS ...................................................................................................................................27

MAIN LOGIC BOARD JUMPERS ...........................................................................................................................28

DECpc 3xx/4xx LP Main Logic Board Jumper Settings.............................................................................28

DECpc 3xx/4xx LP Main board Jumper Locations......................................................................................29

DECpc 450D2LP/466D2LP CPU Board Jumper Settings...........................................................................30

DECpc 450D2LP/466D2LP CPU Board Jumper Locations........................................................................31

COMPUTER MEMORY CONFIGURATIONS ...........................................................................................................32

SIMM Socket Locations.................................................................................................................................33

MCS Logistics Engineering - Nijmegen 3

Table of Contents Digital DECpc LP

REMOVAL PROCEDURES...............................................................................................................................34

Removing a 5¼-Inch FDD.............................................................................................................................34

Removing a 3½-Inch FDD.............................................................................................................................35

Removing the HDD Mounting Tray..............................................................................................................36

Removing the Main Logic Board ..................................................................................................................36

Main Logic Board Connections.....................................................................................................................37

Removing the Power Supply .........................................................................................................................38

INSTALLATION PROCEDURES .............................................................................................................................39

Installing the Bus Expansion Board ..............................................................................................................39

REPLACEMENT PROCEDURES .............................................................................................................................40

Replacing the Computer Battery....................................................................................................................40

CONNECTING OPTIONAL MASS STORAGE DEVICES .........................................................................................41

Diskette Drive Cabling Scheme.....................................................................................................................41

CHAPTER 4 TROUBLESHOOTING..........................................................................................................43

INITIAL TROUBLESHOOTING ............................................................................................................................... 43

BEEP CODES .........................................................................................................................................................44

Beep Codes for Fatal Errors...........................................................................................................................44

Beep Codes for Non-Fatal Errors ..................................................................................................................45

POST AND BOOT MESSAGES..............................................................................................................................45

COMPUTER TROUBLESHOOTING ........................................................................................................................47

DISK DRIVE TROUBLESHOOTING .......................................................................................................................49

MONITOR TROUBLESHOOTING ...........................................................................................................................50

QAPlus/FE Error Messages ...........................................................................................................................51

CHAPTER 5 DEVICE MAPPING................................................................................................................53

Computer Memory Map.................................................................................................................................53

I/O Address Map.............................................................................................................................................54

Computer Interrupt Levels .............................................................................................................................55

DMA Channel Assignment............................................................................................................................55

CHAPTER 6 PASS / FAIL CRITERIA........................................................................................................57

APPENDIX A SERVICE NOTES.................................................................................................................59

APPENDIX B USEFUL INFORMATION...................................................................................................61

RELATED DOCUMENTATION ...............................................................................................................................61

ON-LINE BULLETIN BOARDS ..............................................................................................................................61

DOCUMENT FEEDBACK..............................................................................................................................63

PERSONAL NOTES.........................................................................................................................................65

READERS COMMENTS....................................................................................................................................69

4 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Table of Contents

Table of Figures

Figure 3 - 1 Unlocking and Removing the Outside Cover...............................................................................26

Figure 3 - 2 LP Computer Model Components.................................................................................................27

Figure 3 - 3 DECpc 3xx/4xx LP Mainboard Jumper Locations......................................................................29

Figure 3 - 4 DECpc 450D2LP/466D2LP CPU Board Jumper Locations.......................................................31

Figure 3 - 5 SIMM Socket Locations ................................................................................................................33

Figure 3 - 6 Removing a 5¼-Inch FDD.............................................................................................................34

Figure 3 - 7 Removing the HDD Mounting Tray .............................................................................................35

Figure 3 - 8 Removing the 3½-Inch FDD .........................................................................................................35

Figure 3 - 9 Removing the FDD Adapter Plates...............................................................................................35

Figure 3 - 10 Removing the HDD Mounting Tray ...........................................................................................36

Figure 3 - 11 Main Logic Board Connections...................................................................................................37

Figure 3 - 12 Pulling off Remote On/Off connector.........................................................................................38

Figure 3 - 13 Removing the Power Supply.......................................................................................................38

Figure 3 - 14 Installing Bus Expansion Board.................................................................................................39

Figure 3 - 15 Disconnecting and removing the Battery....................................................................................40

MCS Logistics Engineering - Nijmegen 5

Digital DECpc LP Revision History

Revision

Date

Description of Change

Revision History

Revision A01

March 96 First release of the Service Maintenance Manual describing the

DECpc LP series computer.

MCS Logistics Engineering - Nijmegen 7

Digital DECpc LP Preface

Preface

The DECpc LP Service Maintenance Manual is a troubleshooting guide that can be used for reference when servicing the DECpc LP line of PC’s. Digital Equipment Corporation reserves the right to make changes to the DECpc LP series without notice. Accordingly, the diagrams and procedures in this document may not apply to the computer(s) to be serviced since many of the diagnostic tests are designed to test more than one product.

CAUTION Digital recommends that only A+ certified engineers attempt to repair this equipment.

All troubleshooting and repair procedures are detailed to support subassembly/module level exchange. Because of the complexity of the indivual boards and subassemblies, no one should attempt to make repairs at component level or to make modifications to any printed wiring board. Improper repairs can create a safety hazard. Any indications of component replacement or printed wiring board modifications may void warranty or exchange allowances.

MCS Logistics Engineering - Nijmegen 9

Digital DECpc LP Product Description

Chapter 1 Product Description

Product Introduction

DECpc LP Series computers are a family of high-performance, low-profile personal computers equipped with the latest microprocessor technology. They can be used as stand-alone computers, as clients, or as servers in an office network environment. Developed using modular CPU technology, along with a host of high-performance options, DECpc LP computers are the most advanced low-profile desktop computers in their class.

All DECpc LP computers are industry-standard Intel i486 PCs using a versatile low-profile enclosure.

DECpc LP features:

♦ Three ISA expansion slots ♦ OPTI 496/497 ISA chip set ♦ Dual IDE hard disk drive interface ♦ Intel 80486sx/dx/d2 processor ♦ 2MB system RAM, expandable up to 64MB on motherboard ♦ Optional external cache memory expandable to 64KB ♦ 32-bit local bus SVGA controller with GUI accelerator and 512KB VRAM standard ♦ Additional 512KB VRAM optional ♦ Supports up to four storage devices

MCS Logistics Engineering - Nijmegen 11

Product Description Digital DECpc LP

Product

Model

Memory

Cache

Options

Product Models Information

DECpc LP Models Information

FDD HDD

DECpc 333sxLP DECpc 340dxLP DECpc 425sxLP DECpc 433dxLP DECpc 450d2LP DECpc 466d2LP

PC734-xx - - PC736-xx - - PC741-xx - - PC743-xx - - PC744-xx - - PC746-xx - - -

12 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Utilities & Configuration

Digital recommends to use SETUP.COM only to enable the computer’s BIOS setup

utility. Digital does not recommend using SETUP.COM to change computer

parameters.

Chapter 2 System Utilities &

Configuration

System Utilities

Three utilities and application driver diskettes are supplied with the LP series computer. These diskettes allow to enable the BIOS setup utility and take advantage of the advanced features of the computer’s video circuitry.

Diskette 1: System and VGA Utilities

This diskette contains the following files:

♦ SETUP.COM Allows to enable the ROM Base Setup option in the BIOS Setup utility. ♦ SMODE.EXE Allows to emulate or display non-standard VGA modes. ♦ KP.EXE Allows to set a keyboard and mouse password.

NOTE

MCS Logistics Engineering - Nijmegen 13

Utilities & Configuration Digital DECpc LP

If this is the first time using the System Utilities diskette, it is recommended to follow

the procedures in the order given.

Use SETUP.COM on the System Utilities diskette only when it is necessary to enable

the ROM Base Setup option.

Using the System and VGA Utilities Diskette

The System and VGA Utilities allow to:

♦ Access the computer's BIOS Setup utility ♦ Set a keyboard and mouse password ♦ Emulate or display specific video modes

NOTE

1) Install any optional hardware, i.e. disk drives, ISA exansion boards, etc.

2) If the operating system was installed at the factory, use its copy diskette function to make a backup

copy of the system and VGA utilities diskette. Otherwise use another computer to make a backup copy.

3) Turn on the computer and allow POST to complete.

4) Insert the backup copy of the System and VGA Utilities diskette into drive A.

5) Run SETUP.COM to enable the the computer’s BIOS setup utility.

6) Run KP.EXE to set a keyboard and mouse password.

7) If applicable, run SMODE.EXE to emulate or display the desired video mode.

8) Remove the backup copy and then reboot the computer so changes immediately take effect.

9) If required, install the operating system and any application software.

Running SETUP.COM

The SETUP.COM file allows to select and permanently store information about the computer's installed hardware and software in the battery-backed memory of the CMOS RAM. This information takes effect each time the computer boots and can be changed each time you run Setup.

NOTE

To access SETUP.COM:

1) Turn on the computer.

2) Allow the POST to complete. If the POST detects a configuration error, refer to Chapter

4,“Troubleshooting” for possible causes and suggested solutions.

3) Insert the backup copy of the System and VGA Utilities diskette into drive A.

4) Type a: then press [Enter].

5) Type setup then press [Enter]. Page 1 of Setup appears.

6) Follow the instructions on the screen to exit SETUP.COM (saving the changes).

7) If applicable copy SETUP.COM to a directory on the hard drive.

8) Remove the backup copy of the System and VGA Utilities diskette from drive A.

9) Reboot the computer.

14 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Utilities & Configuration

When you create a keyboard and mouse password, the characters do not appear on

the screen as they are typed. Each time you enter or change a keyboard and mouse

password, the characters also do not appear on the screen as they are typed.

SMODE.EXE

The SMODE utility allows the main logic board's video circuitry to emulate and display non-standard VGA modes. With SMODE, it is possible to run software applications written for the following non-VGA modes:

♦ Standard VGA, EGA and MCGA modes with resolutions up to 640 x 480 ♦ Super VGA modes with resolutions up to 1024 x 786 and display text up to 132 col x 43 rows ♦ CGA, Hercules and MDA modes required by applications designed to run under earlier video

standards

The following procedure describes how to access SMODE:

1) Turn on the computer.

2) Allow the POST to complete.

3) Insert the backup copy of the System and VGA Utilities diskette into drive A.

4) Type a: and press [Enter].

5) Type cd\vga_util and press [Enter].

6) Select the desired video option following the instructions on screen.

7) If applicable, copy the SMODE.EXE file to a directory on the computer's hard disk drive.

8) Remove the System and VGA Utilities diskette from drive A and store it in a safe place.

KP.EXE

KP.EXE is an MS-DOS executable file that allows to set a password for the keyboard and mouse without turning off the computer. When setting this password, the keyboard and mouse can not process any input other than the current keyboard and mouse password. Setting this password secures the computer against unauthorized access while the computer remains turned on. When a keyboard and mouse password has been set, each time the computer is turned off, the password is deleted. When turning on the computer again, a new keyboard and mouse password have to be set. When a power-on password has been set, the power-on password becomes the keyboard and mouse password. Keyboard and mouse passwords can have as many as seven upper or lower case keyboard characters and are recorded exactly as they are entered. For example, when using the 6 from the typewriter key section of the keyboard, the 6 from the numeric keypad cannot be substituted.

NOTE

MCS Logistics Engineering - Nijmegen 15

Utilities & Configuration Digital DECpc LP

Other applications, such as QEMM386 V6.01, use the character string kp to invoke or

enable commands. When having such an application installed, add the /nic parameter

when to set a keyboard and mouse password using the Keyboard Password utility.

Setting a Keyboard and Mouse Password

After copying KP.EXE onto the computer's hard disk, a keyboard and mouse password can be set using the following procedure:

1) At the MS-DOS prompt type kp then press [Enter]. You are then prompted to enter a password.

NOTE

2) Enter a password then press [Enter]. You are then prompted to type the password again to verify it.

3) Enter the password then press [Enter]. The keyboard has been locked.

4) To unlock the keyboard, enter the password and press [Enter].

Diskette 1: Windows 3.0/3.1 Drivers

This diskette contains a variety of Windows-compatible video device drivers. To install any of the supplied video device drivers do the following:

1) Make sure the computer is operating as expected.

2) If applicable, install the operating system and any application software.

3) Configure the computer for the desired video mode.

4) Follow the procedures provided in the Microsoft Windows 3.0/3.1 User’s Guide to properly install all

applicable video device drivers.

Diskette 2: Windows 3.0/3.1 Drivers

This diskette contains a variety of DOS and CAD video application drivers. To install any of the supplied application drivers do the following:

1) Make sure the computer is operating as expected.

2) If applicable, install the operating system.

3) Configure the computer for the desired video mode.

4) Install the DOS or CAD software.

5) Install any DOS or CAD application driver following the procedures in the DOS or CAD software

documentation and appropriate README.DOC file.

16 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Utilities & Configuration

Configuring the Computer

The information listed below explains how to configure the computer using the BIOS Setup utility. If the computer was delivered with factory-installed software, it has already been configured. When familiar with utility programs and their uses, refer to the material in the options table while updating the computer. Otherwise, carefully read and understand all the information in these topics before attempting to modify the computer's configuration settings.

Running the BIOS Setup Utility

The BIOS Setup utility enables to select and permanently store information about the computer's hardware and software in the battery-backed memory of CMOS RAM. This information takes effect each time the computer boots and can be changed each time you run setup. Use the BIOS Setup utility when experiencing problems with the hard disk or when it is necessary to reconfigure the computer. In addition, the BIOS Setup utility should be used to modify the configuration after adding or removing hardware, or changing computer settings.

To run the BIOS Setup utility:

1) Turn on the computer and allow POST to complete.

2) Make a note of any configuration errors listed, and then press [F1] to display the first of three setup

screens.

3) Follow the instructions on screen and any on-line help pop-up screens to configure the computer.

MCS Logistics Engineering - Nijmegen 17

Utilities & Configuration Digital DECpc LP

Menu Field

Settings

Comments

BIOS Setup Utility Options

System time System date ROM based setup

Language

Diskette A / Diskette B

Hard disk 1 / hard disk 2

Base memory

Current time Displays the current time. Current date Displays the current date. Enabled Disabled

English Français Deutsch Italiano Español

3.5", 1.44 MB

3.5", 2.88 MB Not Installed

5.25", 360 KB

5.25", 1.2 MB

3.5", 720 KB Drive types 1 through 49

640 KB Displays the size of base (conventional) memory.

Enables or disables the ROM base setup utility.

Note: If you select Disabled make sure the computer is bootable and you have a working copy of SETUP.COM provided on the supplied system and VGA utilities diskette. Sets the desired language.

Note: You must exit the BIOS setup utility and reboot the computer to get the setup screens to display the desired language.

Sets the size and density of diskette drives.

Enables hard drive size and specific parameters from a predetermined list of drive types. Drive types 2 and 3 or 48 and 49 are user definable for hard drives not listed in the BIOS drive table.

Caution: It is essential to specify the correct IDE hard disk type because the main logic board’s BIOS cannot independently verify this information. The BIOS will not recognize the installed IDE hard disk if the drive type is incorrect.

Note: Choose types 48 and 49, unless there is a conflict with the network; in that case select types 2 and 3. If you select types 2 and 3 make sure to shadow the main board’s BIOS.

Note: If the primary bootable device is a SCSI device, set both hard disk options to NOT INSTALLED.

Note: The main logic board reserves the first 1024 KB of address space for computer use. Base memory (640 KB) is first assigned to the operating system. The remaining 384 KB is assigned to shadow main logic board BIOS, video BIOS, or for other computer use. Base memory is always 640 KB unless an error is detected. If an error is detected, the BIOS Setup utility determines the actual memory found (base and extended) and places the values in their respective

Extended memory

18 MCS Logistics Engineering - Nijmegen

Not user selectable

fields. Displays the current amount of extended memory.

Digital DECpc LP Utilities & Configuration

Menu Field

Settings

Comments

BIOS Setup Utility Options (continued)

Video card

Keyboard

NumLock on boot Password

Parallel port

Serial port 1

VGA or EGA CGA 40 Col CGA 80 Col Monochrome Not Installed Installed Not Installed

On Off Not Installed Installed Enabled at: 378h-37Ah (IRQ7) 278h-27Ah (IRQ7) 3BCh-3BEh (IRQ7) Disabled

Bi-directional mode Compatible mode Enabled as COM1: 3F8h 3FFh (IRQ4) Enabled as COM2: 2F8h 2FFh (IRQ3) Enabled as COM3: 3E8h 3EFh (IRQ4) Enabled as COM4: 2E8h 2EFh (IRQ3) Disabled

Sets the video controller type.

Enables or disables the keyboard when using the computer as a network server.

Note: The computer must initially be set up with a keyboard. Enables or disables the NumLock feature each time the computer boots. Enables or disables a power-on password.

Enables or disables any desired onboard printer port at the specified address.

Allows to select between standard printer and bi-directional applications.

Enables or disables any desired onboard serial port at the specified address.

MCS Logistics Engineering - Nijmegen 19

Utilities & Configuration Digital DECpc LP

Menu Field

Settings

Comments

BIOS Setup Utility Options (continued)

Serial port 2

Diskette drive

IDE hard disk drives

Boot from diskette A Boot from hard disk C HDD user definable types

Exchange diskette drives CPU speed

Enabled as COM2: 2F8h 2FFh (IRQ3) Enabled as COM3: 3E8h 3EFh (IRQ4) Enabled as COM4: 2E8h 2EFh (IRQ3) Enabled as COM1: 3F8h 3FFh (IRQ4) Disabled Enabled Disabled Enabled Disabled

Enabled Disabled Enabled Disabled Types 2 and 3 Types 48 and 49

Disabled Enabled Fast Slow

Enables or disables any desired onboard serial port at the specified address.

Enables or disables the onboard diskette drive controller.

Enables or disables the onboard IDE disk drive controller. Disable this option when having a SCSI controller installed in one of the expansion slots. Enables or disables drive A as the logical boot device.

Enables or disables drive C as the logical boot device.

The BIOS Setup utility allows types 2 and 3 or types 48 and 49 to be user definable. Drive type 48 or 49 information is aliased to drive type 2 or 3 when application software does not recognize drive types above 47. Auto-detection of IDE drive parameter is supported in types 2 and 3 and types 48 and 49. Some operating systems do not recognize hard disk drive types above

29. Auto-detection of IDE drive parameter is supported in types 2 and 3 and types 48 and 49. Allows to logically exchange physical diskette drive designations.

Determines the speed used by the computer each time it is turned on or rebooted.

Note: This option determines the speed used by the computer each time it is turned on or rebooted. Fast¾ is the normal speed and causes the CPU to run at its rated speed. Slow¾ (equivalent to 8 MHz) is used to reduce the effective CPU speed to be compatible with some speed-dependent application programs. If an application program does not run correctly at full speed, try disabling all caches or changing the CPU speed to slow. Computer performance will be severely degraded while operating in slow mode.

20 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Utilities & Configuration

Menu Field

Settings

Comments

BIOS Setup Utility Options (continued)

Post Write

Primary cache

Secondary cache

Shadow BIOS ROM

Shadow video ROM

Monitor Type

Enabled Disabled

640x480 @60Hz/NI : : 1280x1024 @43Hz/I

Allows to enable or disable the posted write feature of the main logic board’s ISA chip set. Selecting enabled will enhance the overall performance of the computer.

Note: Some expansion boards and high speed microprocessors might not operate or be able to take full advantage of this performance option. If this is the case disable the posted write option to remedy any conflicts. Enables or disables the CPU's internal (primary) cache.

Note: Enabling the cache controller significantly improves computer performance by reducing the average number of wait states seen by the microprocessor. However, in some instances you might want to disable the primary cache, for example, while using time-dependent software. In this instance, the computer can operate but not at full potential. Enables or disables the computer's external (secondary) cache.

Note: Enabling the secondary cache significantly improves computer performance by reducing the average number of wait states seen by the microprocessor. However, in some instances, you might want to disable the secondary cache, for example, while using time-dependent software. In this instance, the computer can operate but not at full potential.

Note: When no secondary cache has been installed, make sure this option is set to disabled.

Enables or disables the computer's shadow BIOS ROM option.

Note: This option must be enabled before selecting user definable drive types 2 and 3. Enables or disables the computer's shadow video ROM option.

Note: The main logic board reserves an area of DRAM for a copy of video BIOS ROM. This DRAM called "shadow memory" is writeprotected and has the same addresses as the video BIOS ROM locations. When the video BIOS ROM is shadowed, the ROM information is copied into an appropriate area in DRAM. This increases the computer's performance because the video BIOS instructions are in fast DRAM instead of ROM. Enables to select the monitor type that matches the high resolution capabilities of the main logic board’s video controller.

MCS Logistics Engineering - Nijmegen 21

Digital DECpc LP Service Procedures

Do NOT wear ESD straps when working on terminals,monitors or power supplies

when AC power is applied. This is to avoid the hazard of electrical shock.

Chapter 3 Service Procedures

Safety Requirements

WARNING Static electricity collects on non-conductors such as paper, cloth, or plastic. A static discharge can be damaging even though you often cannot see or feel it.

The following safety precautions must be observed to insure product and personal safety and prevent damage to circuit boards and/or components:

♦ Always wear an ESD wrist strap when handling ESD sensitive material and be sure it is properly

connected.

♦ Keep circuit boards and components away from non-conductors. ♦ Keep clothing away from circuit boards and components. ♦ Keep circuit boards in anti-static bags. ♦ Be cautious when AC power is exposed when working on an assembly. ♦ Always use an ISOLATION TRANSFORMER when diagnosing any terminals, monitors or power

supplies when AC power is applied.

♦ Be cautious of very high voltage potentials when working with monitors.

There should be an approved insulating mat (for technician safety) in front of any workbench where monitors, terminals or power modules are being serviced when power is applied.

NOTE

MCS Logistics Engineering - Nijmegen 23

Service Procedures Digital DECpc LP

Recommended Tools

The following tools will be needed for servicing Digital PC systems. Note that test equipment must be in calibration.

♦ Multimeter (4 1/2 digit) ♦ A philips screwdriver ♦ An antistatic wrist strap

Other Needed Materials

Cleaning agent should be an all purpose cleaner that is used in-house.

Required Special Tools

None.

Remedial Diagnostic Test Software

♦ QAPLUS/fe , PC Advanced Diagnostic Software, latest version.

Partnumber : 22-00908-06

Recommended Virus Detection and Cleanup Software

♦ F-PROT, Virus Detection and Cleanup Software, latest version.

Network locations:

North America, South America, Australia and New Zealand:

MINOTR::USER6:[VIRUS.F-PROT}

Europe, Africa, Middle and Far East:

24 MCS Logistics Engineering - Nijmegen

VARDAF::EUROPUB:[VIRUS_SCANNER.F-PROT]

Digital DECpc LP Service Procedures

ECO/FCO Information

BIOS version information.

Refer to the Digital DECpc Bulletin Board Support , for the latest information on BIOS upgrades

Network locations:

North America, South America, Australia and New Zealand:

PCBUHD::DKB300:[WC30.BBSFILES]

Europe, Africa, Middle and Far East: SUTRA::D6:[PUBLIC].

MCS Logistics Engineering - Nijmegen 25

Service Procedures Digital DECpc LP

Unlocking and Removing Cover

WARNING You might injure yourself or damage the computer when attempting to remove the cover before unplugging ac and monitor power cords.

Before removing the outside cover, do the following:

1) Turn off power to all external devices connected to computer.

2) Turn computer off.

3) Unplug power cord from wall outlet.

4) Disconnect power cord and monitor cord from computer.

To remove the outside cover:

1) Unlock outside cover.

2) Remove four retaining screws located at rear of computer.

3) Carefully slide outside cover toward rear of chassis until it clears lip of front bezel. Carefully lift

outside cover from chassis.

Figure 3 - 1 Unlocking and Removing the Outside Cover

26 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Service Procedures

Computer Components

Figure 3 - 2 LP Computer Model Components

MCS Logistics Engineering - Nijmegen 27

Service Procedures Digital DECpc LP

Feature

Description

Setting

Main Logic Board Jumpers

Jumper pins allow to set specific computer parameters. They are set by changing the pin location of jumper blocks. Note that the square pin of each jumper block is pin 1. A jumper block is a small plastic-encased conductor (shorting plug) that slips over the pins. To change a jumper setting, remove the jumper from its current location. Place the jumper over the two pins designated for the desired setting. Press the jumper evenly onto the pins. Be careful not to bend the pins.

CAUTION Do not touch any electronic component unless you are safely grounded. Wear a grounded wrist strap or touch an exposed metal part of the system box chassis. A static discharge from your fingers can result in permanent damage to electronic components.

DECpc 3xx/4xx LP Main Logic Board Jumper Settings

Settings shown in bold italics are valid for the Cornerstone ImageAccel controllers.

Onboard VGA (IRQ9)

Onboard VGA

CMOS Memory

Reset switch

Parallel Port

Factory test

Video display type

VRAM size

Reserved Reserved Reserved VGAIOW

28 MCS Logistics Engineering - Nijmegen

Enable IRQ9

Disable IRQ9

Enable VGA

Disable VGA

Normal Operation Clear CMOS Memory Enable Disable Printer Bidirectional Normal MFG test mode

Color monitor

Mono monitor 512 KB VRAM 1 MB VRAM Factory use only J29, open Factory use only J30, open Factory use only J31, open Local Local and ISA

J1, jumpered J1, open J2, jumpered

J2, open

J3, pin 1 and 2 jumpered J3, pin 2 and 3 jumpered J4, jumpered J4, open J5, pin 1 and 2 jumpered J5, pin 2 and 3 jumpered J10, open J10, jumpered

J11, jumpered

J11, open J28, pin 1 and 2 jumpered J28, pin 2 and 3 jumpered

J35, pin 1 and 2 jumpered J35, pin 2 and 3 jumpered

Digital DECpc LP Service Procedures

DECpc 3xx/4xx LP Main board Jumper Locations

Figure 3 - 3 DECpc 3xx/4xx LP Mainboard Jumper Locations

MCS Logistics Engineering - Nijmegen 29

Service Procedures Digital DECpc LP

Feature

Description

Setting

DECpc 450D2LP/466D2LP CPU Board Jumper Settings

Vacancy socket

Processor type

Cache size

CPU clock input

(1)

DECpc 466d2LP only

(2)

DECpc 450d2LP only

Empty or Intel Overdrive microprocessor installed

J101, pins 1 and 2 jumpered J102, pins 1 and 2 jumpered J103, pins 1 and 2 jumpered

Intel 486DX or Intel 486DX2 installed

J101, pins 2 and 3 jumpered J102, pins 2 and 3 jumpered J103, pins 2 and 3 jumpered

(1)

486DX

J114, pins 1 and 2 jumpered J115, pins 1 and 2 jumpered

486SX

J114, pins 2 and 3 jumpered J115, pins 2 and 3 jumpered

128 KB

J103, pins 1 and 2 jumpered J104, pins 1 and 2 jumpered

256 KB

J103, pins 2 and 3 jumpered J104, pins 2 and 3 jumpered

25 MHz

(2)

J109 jumpered J110 open J111 open J112 open

33 MHz

(1)

J109 jumpered J110 open J111 open J112 open

40 MHz 50 MHz

Not applicable Not applicable

30 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Service Procedures

DECpc 450D2LP/466D2LP CPU Board Jumper Locations

Figure 3 - 4 DECpc 450D2LP/466D2LP CPU Board Jumper Locations

MCS Logistics Engineering - Nijmegen 31

Service Procedures Digital DECpc LP

Bank 0

Bank 1

Bank 2

Bank 3

Total

Computer Memory Configurations

Adding more memory allows the computer to run larger, more complicated software and to run it faster. The computer comes with at least 4 MB of memory. This amount can be increased up to 64 MB. However, when adding additional memory make sure to:

♦ Install 36-bit SIMMs having an access time of 70 ns or less. ♦ Only those configurations listed below are allowed. ♦ 4 MB or 16 MB single in-line memory modules (SIMMs) may be added. ♦ Fill bank 0 before bank 1, starting from the leftmost vacant socket (looking from the front of the

computer).

4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 16 MB 4 MB 4 MB 16 MB 16 MB 16 MB 16 MB 16 MB 16 MB 16 MB 16 MB 16 MB 16 MB 16 MB 16 MB

4 MB 8 MB 12 MB 16 MB 24 MB 40 MB 16 MB 32 MB 48 MB 64 MB

32 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Service Procedures

SIMM Socket Locations

Figure 3 - 5 SIMM Socket Locations

MCS Logistics Engineering - Nijmegen 33

Service Procedures Digital DECpc LP

Removal Procedures

Removing a 5¼-Inch FDD

To remove a 5¼-Inch FDD:

1) Turn off the computer.

2) Remove outside cover.

3) Remove two retaining screws from each side of bottom bay.

4) Remove FDD from bay.

Figure 3 - 6 Removing a 5¼-Inch FDD

34 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Service Procedures

Removing a 3½-Inch FDD

To remove a 3½-Inch FDD:

1) Turn off the computer.

2) Disconnect external devices, ac power and monitor power.

3) Unlock and remove outside cover.

4) Disconnect power and ribbon cables.

5) Remove the HDD mounting tray (to access the FDD retaining screws).

6) Remove the four FDD retaining screws.

7) Remove FDD from bay.

Figure 3 - 7 Removing the HDD Mounting Tray

Figure 3 - 8 Removing the 3½-Inch FDD

Figure 3 - 9 Removing the FDD Adapter Plates

MCS Logistics Engineering - Nijmegen 35

Service Procedures Digital DECpc LP

Removing the HDD Mounting Tray

To remove the Mounting Adapter:

1) Disconnect the device to be removed.

2) Loosen four retaining screws holding the tray to the chassis and remove the tray.

3) Remove the four screws holding the device to the tray and remove the device.

Figure 3 - 10 Removing the HDD Mounting Tray

Removing the Main Logic Board

To remove the main logic board:

1) Turn off the computer.

2) Disconnect external devices, ac power, and monitor power.

3) Unlock and remove outside cover.

4) Disconnect all connectors from the board.

5) Remove the expansion board (if fitted).

6) Disconnect and remove the battery (see figure).

7) Remove the board retaining screws and carefully lift the board free from the chassis.

36 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Service Procedures

Legend

Description

Main Logic Board Connections

Figure 3 - 11 Main Logic Board Connections

A B C D E F G H I J K L M N O P

MCS Logistics Engineering - Nijmegen 37

Video connector Parallel port Serial port 2 Serial port 1 Keyboard connector Mouse connector Power connector Battery Floppy disk interface IDE hard disk interface SIMM system memory ISA expansion bus board CPU board connectors ROM BIOS VRAM VGA feature connector (output only)

Service Procedures Digital DECpc LP

Removing the Power Supply

To remove the power supply:

1) Disconnect power cord.

2) Disconnect all of the power supply connectors.

3) Pull off the remote ON/OFF mechanical connector.

4) Remove the six PSU retaining screws.

5) Slide the PSU backwards and free of the chassis.

Figure 3 - 12 Pulling off Remote On/Off connector

Figure 3 - 13 Removing the Power Supply

38 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Service Procedures

Installation Procedures

Installing the Bus Expansion Board

To install the bus expansion board:

1) Position the Bus Expansion Board above the socket on the main board and slide it into the connector (you may have to tilt the board slightly to avoid the support unit).

2) Fit the two securing screws.

Figure 3 - 14 Installing Bus Expansion Board

MCS Logistics Engineering - Nijmegen 39

Service Procedures Digital DECpc LP

Replacement Procedures

Replacing the Computer Battery

To replace the computer battery/real time clock:

1) Record computer configuration settings.

2) Turn off the computer.

3) Unlock and remove outside cover.

4) Disconnect the battery cable from header BATTERY CONN on the main logic board.

5) Remove battery from its mounting pad located on the main logic board.

6) Plug the replacement battery cable into header BATTERY CONN.

7) Replace and lock outside cover.

8) Run BIOS setup to restore the computer’s setup values.

Figure 3 - 15 Disconnecting and removing the Battery

40 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Service Procedures

Make sure the cable is connected with correct orientation. Most cables and sockets

are keyed so they cannot be connected backwards. If the cable or device is not

keyed, connect pin 1 of cable to pin 1 of device's socket.

Pin 1 of the cable is on the edge with colored stripe. Pin 1 of the device's socket

should be marked with a number or symbol at one end of the socket or with a number

or symbol printed on the circuit board near one end of the socket. If necessary, refer

to the device's documentation for pin 1 orientation.

Optional Diskette Drive

Drive Designation

Connector Number

Connecting Optional Mass Storage Devices

To connect optional mass storage devices, perform the following:

1) Plug an available power connector into a mating power connector located at the rear of the appropriate mass storage device.

2) For diskette drives , make sure one end of the supplied ribbon cable is connected into the diskette drive header on the main logic board. Connect the other end into the data/control connector at the rear of the appropriate diskette drive.

3) For IDE hard disk drives, connect one end of the supplied ribbon cable into the IDE header on the main logic board. Connect the other end into the data/control connector at the rear of the hard disk drive.

4) Replace and lock outside cover.

5) Run the BIOS setup utility if any of the installed mass storage devices (diskette or IDE) is an addition to the computer or a different type.

NOTE

Diskette Drive Cabling Scheme

DECpc 3xx/4xx LP Series computers are shipped with a 3½-Inch diskette drive designated as drive A.When adding add an additional 3½-Inch or 5¼-Inch diskette drive and you want to designate either one as diskette drive A use the proper diskette drive cable connectors.

3½-Inch 3½-Inch 5¼-Inch 5¼-Inch

MCS Logistics Engineering - Nijmegen 41

B 3 A 1 B 4 A 2

Digital DECpc LP Troubleshooting

If you need to return a failed component, pack it in its original container and return it to

Digital for service.

Chapter 4 Troubleshooting

The following pages provide initial troubleshooting procedures and tables listing specific problems, probable causes, and recommended actions to take if the computer fails after configuration or after installation of optional hardware or software. Refer to the documentation supplied with additional options when experiencing problems with specific options that have been installed.

Initial Troubleshooting

Follow these general procedures to troubleshoot the DECpc LP computer: ♦ Press [Ctrl] + [Alt] + [Del]. If the computer fails to boot, turn it off, wait until all hard disk drives spin

down completely, and then turn it back on.

♦ Ensure that all cables and connections are secure. ♦ If the POST detects an error refer to Chapter 4,“Troubleshooting” and take the appropriate steps to

correct the problem. After the problem has been resolved, restart the computer.

♦ Run the diagnostic software. ♦ Run the BIOS Setup utility.

NOTE

Fill in the appropriate fields of the Part Exchange Form with the relevant error information!!

MCS Logistics Engineering - Nijmegen 43

Troubleshooting Digital DECpc LP

Beep Code

Error Message

Beep Codes

If the POST finds an error and cannot display a message, the computer's speaker emits a series of beeps to indicate the error and places a value in I/O port 80h. For example, a failure of bit 3 in the first 64 KB of RAM is indicated by a 2-1-4 beep code (a burst of two beeps, a single beep, and a burst of four beeps). The table below lists the beep codes and the values the POST writes to I/O port 80h when it encounters a fatal error. This table lists fatal errors that lock up the computer. Nonfatal errors that do not lock up the computer are listed in a separate table.

Beep Codes for Fatal Errors

1-1-3 1-1-4 1-2-1 1-2-2 1-2-3 1-3-1 1-3-3 1-3-4 1-4-1 1-4-2 2-1-1 2-1-2 2-1-3 2-1-4 2-2-1 2-2-2 2-2-3 2-2-4 2-3-1 2-3-2 2-3-3 2-3-4 2-4-1 2-4-2 2-4-3 2-4-4 3-1-1 3-1-2 3-1-3 3-1-4 3-2-4 4-2-1 4-2-2

CMOS write/read failure ROM checksum failure Interval timer failure DMA failure DMA page register write/read failure RAM refresh failure 1st 64 KB RAM chip or data line failure 1st 64 KB RAM odd/even logic failure 1st 64 KB RAM address line failure 1st 64 KB RAM parity failure Bit 0 1st 64 KB RAM failure Bit 1 1st 64 KB RAM failure Bit 2 1st 64 KB RAM failure Bit 3 1st 64 KB RAM failure Bit 4 1st 64 KB RAM failure Bit 5 1st 64 KB RAM failure Bit 6 1st 64 KB RAM failure Bit 7 1st 64 KB RAM failure Bit 8 1st 64 KB RAM failure Bit 9 1st 64 KB RAM failure Bit A 1st 64 KB RAM failure Bit B 1st 64 KB RAM failure Bit C 1st 64 KB RAM failure Bit D 1st 64 KB RAM failure Bit E 1st 64 KB RAM failure Bit F 1st 64 KB RAM failure Slave DMA register failure Master DMA register failure Master interrupt mask register failure Slave interrupt mask register failure Keyboard/mouse controller failure Timer tick interrupt failure Shutdown failure

44 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Troubleshooting

Beep Code

Error Message

Beep Code

Error Message

Italics indicate variable parts of a message such as memory addresses, hexadecimal

values, and so on.

These messages can differ at each occurrence.

Beep Codes for Fatal Errors (continued)

4-2-3 4-2-4 4-3-1 4-3-3 4-3-4 4-4-1 4-4-2 4-4-3

Gate A20 failure Unexpected interrupt in protected mode RAM failure (above 0FFFFh) Interval timer 2 failure Time-of-day clock failure Serial port failure Parallel port failure Math coprocessor failure

Beep Codes for Non-Fatal Errors

3-3-4 3-4-1 3-4-2

Screen memory or failure Screen initialization or failure Screen retrace or failure

POST and Boot Messages

The POST displays messages to alert to errors in hardware, software, and firmware or to provide operating information about the computer. Each time the POST displays a message on the screen, the computer's speaker beeps twice. If an error occurs before the monitor is initialised, specific beep codes sound to alert to a problem. The following table lists a general grouping of system messages. In addition, each message is accompanied by text describing the message and in most cases, a recommended solution to the problem.

NOTE

MCS Logistics Engineering - Nijmegen 45

Troubleshooting Digital DECpc LP

Message

Solution

POST and Boot Messages (continued)

No timer tick Shutdown failure Timer 2 failure Keyboard stuck key Keyboard controller Keyboard clock line Keyboard data line Keyboard failure Mouse failure

640 KB base memory 0 KB extended memory Time-of-day clock stopped Invalid configuration information Diskette drive failure

Hard disk controller failure

Hard disk 0 failure

xxxx0h optional ROM bad checksum = xx Time-of-day not set Keyboard is locked Enable NMI Enable cache Boot

Replace main logic board. Replace main logic board. Replace main logic board. Check the keyboard connection. If the connection is secure, the keyboard or keyboard controller might have failed. Replace keyboard.

Check the mouse connection. If the problem persists, replace the mouse.

Replace RTC. Run the BIOS Setup utility.

Run the BIOS Setup utility. Check all connections. If the problem persists, replace the diskette drive. Run the BIOS Setup utility. Check all connections. If the problem persists, replace the controller. Run the BIOS Setup utility. Check all connections. If the problem persists, replace the hard disk. Correct the address conflict. If the problem persists, replace the ROM chip. Run BIOS Setup utility and set the time and date. Unlock the keyboard.

46 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Troubleshooting

Problem

Possible Cause

Action

Computer Troubleshooting

No response when the computer is turned on Power is on, but there is no screen display

Computer does not boot from an IDE hard disk drive

Main logic board failure.

Main logic board jumpers incorrectly set. Brightness and contrast controls are not correctly set.

Monitor cable is incorrectly installed. Operating system software is not installed on the IDE hard disk drive.

IDE hard disk drive is not correctly formatted or the requested partition does not exist.

There is no software on the requested partition.

IDE hard disk drive jumpers incorrectly set.

IDE drive type incorrect.

IDE main logic board jumper incorrectly set.

Loose cables.

Replace main logic board.

Set all appropriate jumpers.

Adjust the brightness and contrast controls.

Check all monitor connections.

Install the appropriate operating system.

Format the IDE hard disk drive or partition the IDE hard disk drive using the supplied operating system software.

Install software on the requested partition.

Refer to the supplied IDE hard disk drive kit installation instructions.

Run the BIOS Setup utility to identify the correct drive type. See drive type label on drive or consult drive documentation.

Set the jumper for IDE operation.

Secure all cable connections.

MCS Logistics Engineering - Nijmegen 47

Troubleshooting Digital DECpc LP

Problem

Possible Cause

Action

Computer Troubleshooting (continued)

Computer does not boot from an internal SCSI hard disk drive

No response to mouse commands

Operating system software is not installed on the SCSI hard disk drive.

Requested partition does not exist.

SCSI hard disk drive jumpers incorrectly set.

SCSI ID conflicts.

Terminating resistors not removed from the SCSI hard disk drive.

Computer not configured for SCSI hard disk drive operation.

IDE main logic board jumper incorrectly set. Mouse is password protected.

Mouse is connected to the keyboard port.

Install the appropriate operating system.

Partition the SCSI hard disk drive and then reload the operating software.

Refer to the supplied SCSI hard disk drive kit installation instructions.

Refer to the supplied SCSI hard disk drive kit installation instructions on setting SCSI IDs.

Remove terminating resistors. Refer to the supplied kit installation instructions.

Run the BIOS Setup utility and set Hard Disk 1/Hard Disk 2 to "Not Installed" and IDE Hard Disk Drives options to "Disabled". This disables the onboard IDE interface.

NOTE: When both IDE and SCSI hard disk drives are installed, the computer uses the IDE hard disk drive as the boot device.

Disable the IDE main logic board jumper.

Enter the keyboard and mouse password.

Power down the computer and connect the mouse to the mouse port.

Mouse driver not installed.

48 MCS Logistics Engineering - Nijmegen

Install the appropriate mouse driver. Refer to the supplied application software documentation.

Digital DECpc LP Troubleshooting

Problem

Possible Cause

Action

Problem

Possible Cause

Action

Computer Troubleshooting (continued)

Computer does not boot from a target diskette drive

No response to keyboard commands

Drive ID incorrectly set.

Diskette drive not enabled.

Diskette boot option disabled.

Diskette does not contain start-up files.

Loose cables. Keyboard is password protected.

Keyboard is connected to the mouse port.

Disk Drive Troubleshooting

IDE/SCSI hard disk drive cannot read or write information

Incorrect disk drive jumper settings.

Loose or incorrectly installed cables.

IDE drive type incorrect.

Make sure the drive ID is correctly set (refer to the documentation supplied with the diskette drive).

Run the BIOS Setup utility to enable the diskette drive.

Run the BIOS Setup utility and set Boot From Diskette A to "Enabled".

Insert a diskette with the correct start-up files.

Secure all cable connections. Enter the keyboard password.

Power down the computer and connect the keyboard to the keyboard port.

Refer to the supplied kit installation instructions.

Make sure all cables are correctly installed.

Run the BIOS Setup utility to identify the correct drive type.

Target diskette drive cannot read or write information

MCS Logistics Engineering - Nijmegen 49

Onboard IDE interface disabled.

IDE/SCSI hard disk drive is not correctly formatted or partitioned.

Computer is not configured for SCSI hard disk operation. Onboard diskette controller disabled.

Diskette write protection is enabled.

Run the BIOS Setup utility and set the IDE controller option to “Enabled”.

Format and partition as required using the supplied operating system.

Run BIOS setup utility to configure computer for SCSI operation.

Run the BIOS Setup utility and set the diskette controller to “Enabled”.

Run the BIOS Setup utility and set the diskette write protection to “Disabled”.

Troubleshooting Digital DECpc LP

Problem

Possible Cause

Action

Monitor Troubleshooting

Monitor power indicator is not on No screen display

Distortedrolling-or flickering screen displayor wrong/ uneven color Color monitor displaying monochrome

Monitor is turned off.

Power indicator is defective. Configuration error.

Monitor brightness and contrast controls are incorrectly set. Monitor incorrectly adjusted.

Monitor signal cable incorrectly installed.

Computer was turned on before the monitor was turned on.

Video jumper incorrectly set.

Turn on the monitor.

Replace the failed component. Run the BIOS SETUP UTILITY to configure the computer for VGA operation. Set the jumper for VGA operation. Refer to “Main Logic Board Jumpers”.

Adjust the monitor brightness and contrast controls. Adjust accordingly.

Straighten any bent connector pins and then reconnect.

Turn off the computer, turn on the monitor, then turn the computer back on.

Set the jumper for VGA operation.

50 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Troubleshooting

Component

Messages

Solution

QAPlus/FE Error Messages

CPU

Hard disk

Hard drive/controller

Floppy diskette

Floppy drive Battery/clock

CMOS Serial port

Video adapter

Arithmetic Function Failed. General Functions Failed. Exception Interrupt in Protected Mode. Refresh Failure. Logic Functions Failed. Butterfly Cylinder Access Test Failed. Cylinder 0 Errors. Random Cylinder Access Failed. Linear Cylinder Access Failed. Controller Diagnostic Test Failed. Questionable Controller Card. Hard drives failed. Media Mismatch. Drive Not Ready.

Write Protected Media. Unformatted Media. Floppy Drives Failed. Check connections, Replace drive. Clock Stopped. Invalid Date. RTC Interrupt Failed. CMOS Clock Test Failed. Change time from Setup menu in QAPLUS. COM port failed. Serial Chip Error. Serial Compare Error. Serial Timeout Error. Video Failed. Error in Video Buffer.

Reset CPU. Replace CPU.

Low-level format hard disk. Replace disk.

Run Setup, Check connections, Reset controller, Replace controller, Replace disk.

Use known good diskette. Check size and density of diskette. Close drive door. Remove write protection. Format diskette.

Run Setup. Replace battery/clock.

Check COM device. Check connections. Replace COM device. Replace COM device. Replace video adapter. Replace video adapter.

MCS Logistics Engineering - Nijmegen 51

Digital DECpc LP Device Mapping

Address Range

Function

Size

Chapter 5 Device Mapping

This section provides a series of tables listing mapping and address information related to computer memory and various main logic board devices (keyboard controller, interrupt controller, DMA controller, etc.). The computer's memory and address locations are allocated at the factory to operate within a standard PC environment. However, due to the number of optional devices and/or expansion boards that are available, sometimes memory and address locations need to be changed. For example, some network expansion boards require a specific memory location. If that location is already allocated, a memory conflict results and the expansion board will not operate as expected. Note that some memory, I/O and interrupt locations can be changed using the BIOS Setup utility.

CAUTION Before changing any memory or address location, refer to the documentation supplied

with the optional device, expansion board, or software application and make sure adequate information is available.

Computer Memory Map

0h to 9FFFFh A0000h to BFFFFh C0000h to C7FFFh C8000h to DFFFFh

E0000h to EFFFFh F0000h to FFFFFh 100000h to 3FFFFFFh

MCS Logistics Engineering - Nijmegen 53

Base memory 640 KB Video RAM 128 KB VGA BIOS 32 KB BIOS extension ROM (AT bus usage) Reserved 64 KB Computer BIOS 64 KB Extended memory 63 MB

96 KB

Device Mapping Digital DECpc LP

Range (hexadecimal)

Function

I/O Address Map

000 - 00F 020 - 021 022 023 024 040 - 043 060 - 06F 070 - 07F 080 - 08F 0A0 - 0A1 0C0 - 0CF 0F0 0F1 0F8 - 0FF 1F0 - 1F8 2F8 - 2FF 378 - 37F 3B0 - 3DF 3F0 - 3F7 3F6 - 3F7 3F8 - 3FF 46E8

DMA controller one Interrupt controller one Index register (82C206, 82C496,82C497) Data register (82C206) Data register (82C496, 82C497) Interval timer Keyboard controller Real-time clock (RTC), NMI DMA page register Interrupt controller two DMA controller two Clear math coprocessor busy Reset math coprocessor Math coprocessor IDE controller COM2 LPT VGA registers Diskette controller IDE controller (alt status, device address) COM1 VGA enable register

54 MCS Logistics Engineering - Nijmegen

Digital DECpc LP Device Mapping

Priority

Interrupt Controller

Interrupt Number

Interrupt Source

Channel

Controller

Function

Computer Interrupt Levels

1 1 2 1

3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 1 12 1 13 1 14 1 15 1

DMA Channel Assignment

0 1 1 1 2 1 3 1 4 2 5 2 6 2 7 2

Refresh Not used Diskette controller Not used Not used Not used Not used Not used

IRQ0 Timer tick IRQ1 Keyboard controller IRQ2 Cascade interrupt IRQ8 Real-time clock (RTC) IRQ9 Reserved IRQ10 Reserved IRQ11 Reserved IRQ12 Mouse interrupt IRQ13 Math coprocessor IRQ14 Hard disk drive IRQ15 Reserved IRQ3 COM2 IRQ4 COM1 IRQ5 Reserved IRQ6 Diskette drive IRQ7 LPT

MCS Logistics Engineering - Nijmegen 55

Digital DECpc LP Pass / Fail Criteria

Chapter 6 Pass / Fail Criteria

As Final Acceptance Test the following tests should be run to meet the Pass/Fail criteria:

1) Successful completion of the POST tests.

2) Successful completion of the following QAPLUS/fe module tests (one pass):

♦ System Board (all tests) ♦ Memory (all tests) ♦ Video (all tests)

♦ ♦ Hard Disk (all tests, except: Sequential write/read (destructive test !!) and

♦ Sequential write/random read (destructive test !!)) ♦ Floppy Disk (all tests) ♦ Keyboard (all tests) ♦ COM Ports (all tests) ♦ LPT Ports (all tests) ♦ Pointer Device (all tests)

3) Successful bootstrap of the on the computer installed Operating System.

Operating Systems Supported (LP):

◊ MS-DOS version 5.0 and later ◊ OS/2 version 1.3 and later

Remove any software that was put on the hard drive to enable repair of the system before shipping.

When completed carefully clean the outside of the unit with cleaning solution.

MCS Logistics Engineering - Nijmegen 57

Digital DECpc LP Service Notes

Appendix A Service Notes

This appendix contains the service notes for the DECpc LP series computer.

MCS Logistics Engineering - Nijmegen 59

Digital DECpc LP Useful Information

Order Number

Description

Appendix B Useful Information

On-Line Bulletin Boards

The most current product information and technical support is also available on line. The most current device drivers, Setup diskettes and technical tips can be found on all of these bulletin boards.

♦ DECpc Bulletin Board Server DECpc BBS provides an easy-to-use, menu-driven bulletin board providing on-line access to the

latest PC product information, device drivers, shareware and freeware.

Network Location for ;

North America, South America, Australia and New Zealand

PCBUHD::DKB300:[WC30.BBSFILES]

Europe, Africa, Middle and Far East: SUTRA::D6:[PUBLIC].

MCS Logistics Engineering - Nijmegen 61

Digital DECpc LP Document Feedback

Document Feedback

If you have comments on the contents or layout of this document we highly appreciate your feedback. We will do our best to make this document a valuable support to your service efforts for Digital. Please fill -out the reader feedback form and send or fax it to:

Digital Equipment Parts Center b.v. Att: MCS Logistics Engineering Call Desk P.O. Box 6774 6503 GG Nijmegen Holland

If you have questions about this document please do not hesitate to get in contact with our Call Desk. The number is:

Phone: xx31-24-3529666 Fax: xx31-24-3563106

MCS Logistics Engineering - Nijmegen 63

READERS COMMENTS

DECpc LP Service Maintenance Manual

K-MN-SD00000-21-JG00.A

This form is for documents only. Commitments submitted on this form are used at Digital’s direction. Did you find errors in this manual? If so, specify by page.

....................................................................................................................................................................................

What is your general reaction to this manual (format, completeness, organisation etc.)?

....................................................................................................................................................................................

Is the documentation understandable, usable, and sufficient for your needs? What material is missing?

....................................................................................................................................................................................

Additional comments:

....................................................................................................................................................................................

Name .................................................................................................................................................................

Title .................................................................................................................................................................

Company ................................................................. Dept .........................................................................

Address .................................................................................................................................................................

City ................................................................. State .........................................................................

Country .................................................................................................................................................................

DEC DECpc LP DEC DECpc LP Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Table of Figures

Revision History

Preface

Chapter 1 Product Description

Product Introduction

Product Models Information

System Utilities

Diskette 1: System and VGA Utilities

Diskette 1: Windows 3.0/3.1 Drivers

Diskette 2: Windows 3.0/3.1 Drivers

Configuring the Computer

BIOS Setup Utility Options

Chapter 3 Service Procedures

Safety Requirements

Recommended Tools

ECO/FCO Information

Unlocking and Removing Cover

Computer Components

Main Logic Board Jumpers

Computer Memory Configurations

Removal Procedures

Installation Procedures

Replacement Procedures

Connecting Optional Mass Storage Devices

Chapter 4 Troubleshooting

Initial Troubleshooting

Beep Codes

POST and Boot Messages

Computer Troubleshooting

Disk Drive Troubleshooting

Monitor Troubleshooting

Chapter 5 Device Mapping

Chapter 6 Pass / Fail Criteria

Appendix A Service Notes

Appendix B Useful Information

Related Documentation

On-Line Bulletin Boards

Document Feedback

READERS COMMENTS