Subscribe to Our Youtube Channel
Related Manuals for Digital Equipment DECpc LP
Summary of Contents for Digital Equipment DECpc LP
- Page 1 Service Maintenance Manual DECpc LP K-MN-SD00000-21-JG00.A MCS LOGISTICS ENGINEERING Copyright Digital Equipment Corporation NIJMEGEN All rights reserved THE NETHERLANDS March 1996...
- Page 2 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.
-
Page 3: Table Of Contents
Table of Contents REVISION HISTORY ............................7 PREFACE................................9 CHAPTER 1 PRODUCT DESCRIPTION ....................11 ...........................11 RODUCT NTRODUCTION ........................12 RODUCT ODELS NFORMATION DECpc LP Models Information ........................12 CHAPTER 2 SYSTEM UTILITIES & CONFIGURATION..............13 ...............................13 YSTEM TILITIES 1: S VGA U .......................13 ISKETTE YSTEM AND TILITIES Using the System and VGA Utilities Diskette ....................14... - Page 4 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 ..........................39 NSTALLATION ROCEDURES Installing the Bus Expansion Board ......................39...
- Page 5 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...
-
Page 6: Revision History
Digital DECpc LP Revision History Revision History Revision Date Description of Change March 96 First release of the Service Maintenance Manual describing the Revision A01 DECpc LP series computer. MCS Logistics Engineering - Nijmegen... -
Page 7: Preface
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. -
Page 8: Chapter 1 Product Description
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: ♦... -
Page 9: Product Models Information
Product Description Digital DECpc LP Product Models Information DECpc LP Models Information Product Model Memory Cache Options PC734-xx DECpc 333sxLP PC736-xx DECpc 340dxLP PC741-xx DECpc 425sxLP DECpc 433dxLP PC743-xx DECpc 450d2LP PC744-xx PC746-xx DECpc 466d2LP MCS Logistics Engineering - Nijmegen... -
Page 10: Chapter 2 System Utilities & Configuration
Digital DECpc LP Utilities & Configuration 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. -
Page 11: Using The System And Vga Utilities Diskette
Utilities & Configuration Digital DECpc LP 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... -
Page 12: Smode.exe
Digital DECpc LP Utilities & Configuration 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: ♦... -
Page 13: Setting A Keyboard And Mouse Password
Utilities & Configuration Digital DECpc LP 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: At the MS-DOS prompt type then press [Enter]. You are then prompted to enter a password. -
Page 14: Configuring The Computer
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. -
Page 15: Bios Setup Utility Options
Utilities & Configuration Digital DECpc LP BIOS Setup Utility Options Menu Field Settings Comments System time Current time Displays the current time. Current date Displays the current date. System date Enabled Enables or disables the ROM base setup utility. ROM based... - Page 16 Digital DECpc LP Utilities & Configuration BIOS Setup Utility Options (continued) Menu Field Settings Comments VGA or EGA Sets the video controller type. Video card CGA 40 Col CGA 80 Col Monochrome Not Installed Installed Enables or disables the keyboard when using the computer as a...
- Page 17 Utilities & Configuration Digital DECpc LP BIOS Setup Utility Options (continued) Menu Field Settings Comments Enabled as Enables or disables any desired onboard serial port at the specified Serial port 2 COM2: 2F8h- address. 2FFh (IRQ3) Enabled as COM3: 3E8h-...
- Page 18 Digital DECpc LP Utilities & Configuration BIOS Setup Utility Options (continued) Menu Field Settings Comments Enabled Allows to enable or disable the posted write feature of the main logic Post Write Disabled board’s ISA chip set. Selecting enabled will enhance the overall performance of the computer.
-
Page 19: Chapter 3 Service Procedures
Digital DECpc LP Service Procedures 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: ♦... -
Page 20: Recommended Tools
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. -
Page 21: Eco/Fco Information
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]. -
Page 22: Unlocking And Removing Cover
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: Turn off power to all external devices connected to computer. -
Page 23: Computer Components
Digital DECpc LP Service Procedures Computer Components Figure 3 - 2 LP Computer Model Components MCS Logistics Engineering - Nijmegen... -
Page 24: Main Logic Board Jumpers
Service Procedures Digital DECpc LP 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. -
Page 25: Decpc 3Xx/4Xx Lp Main Board Jumper Locations
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... -
Page 26: Decpc 450D2Lp/466D2Lp Cpu Board Jumper Settings
Service Procedures Digital DECpc LP DECpc 450D2LP/466D2LP CPU Board Jumper Settings Feature Description Setting Empty or Intel Overdrive J101, pins 1 and 2 jumpered Vacancy socket microprocessor installed J102, pins 1 and 2 jumpered J103, pins 1 and 2 jumpered... -
Page 27: Decpc 450D2Lp/466D2Lp Cpu Board Jumper Locations
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... -
Page 28: Computer Memory Configurations
Service Procedures Digital DECpc LP 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: ♦... -
Page 29: Simm Socket Locations
Digital DECpc LP Service Procedures SIMM Socket Locations Figure 3 - 5 SIMM Socket Locations MCS Logistics Engineering - Nijmegen... -
Page 30: Removal Procedures
Service Procedures Digital DECpc LP Removal Procedures Removing a 5¼-Inch FDD To remove a 5¼-Inch FDD: Turn off the computer. Remove outside cover. Remove two retaining screws from each side of bottom bay. Remove FDD from bay. Figure 3 - 6 Removing a 5¼-Inch FDD... -
Page 31: Removing A 3½-Inch Fdd
Digital DECpc LP Service Procedures Removing a 3½-Inch FDD To remove a 3½-Inch FDD: Turn off the computer. Disconnect external devices, ac power and monitor power. Unlock and remove outside cover. Disconnect power and ribbon cables. Remove the HDD mounting tray (to access the FDD retaining screws). -
Page 32: Removing The Hdd Mounting Tray
Service Procedures Digital DECpc LP Removing the HDD Mounting Tray To remove the Mounting Adapter: Disconnect the device to be removed. Loosen four retaining screws holding the tray to the chassis and remove the tray. Remove the four screws holding the device to the tray and remove the device. -
Page 33: Main Logic Board Connections
Digital DECpc LP Service Procedures Main Logic Board Connections Figure 3 - 11 Main Logic Board Connections Legend Description Video connector Parallel port Serial port 2 Serial port 1 Keyboard connector Mouse connector Power connector Battery Floppy disk interface IDE hard disk interface... -
Page 34: Removing The Power Supply
Service Procedures Digital DECpc LP Removing the Power Supply To remove the power supply: Disconnect power cord. Disconnect all of the power supply connectors. Pull off the remote ON/OFF mechanical connector. Remove the six PSU retaining screws. Slide the PSU backwards and free of the chassis. -
Page 35: Installation Procedures
Digital DECpc LP Service Procedures Installation Procedures Installing the Bus Expansion Board To install the bus expansion board: 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). -
Page 36: Replacement Procedures
Service Procedures Digital DECpc LP Replacement Procedures Replacing the Computer Battery To replace the computer battery/real time clock: Record computer configuration settings. Turn off the computer. Unlock and remove outside cover. Disconnect the battery cable from header BATTERY CONN on the main logic board. -
Page 37: Connecting Optional Mass Storage Devices
Digital DECpc LP Service Procedures Connecting Optional Mass Storage Devices To connect optional mass storage devices, perform the following: Plug an available power connector into a mating power connector located at the rear of the appropriate mass storage device. For diskette drives , make sure one end of the supplied ribbon cable is connected into the diskette drive header on the main logic board. -
Page 38: Chapter 4 Troubleshooting
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. -
Page 39: Beep Codes
Troubleshooting Digital DECpc LP 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). -
Page 40: Beep Codes For Non-Fatal Errors
Digital DECpc LP Troubleshooting Beep Codes for Fatal Errors (continued) Beep Code Error Message Gate A20 failure 4-2-3 Unexpected interrupt in protected mode 4-2-4 4-3-1 RAM failure (above 0FFFFh) 4-3-3 Interval timer 2 failure Time-of-day clock failure 4-3-4 Serial port failure... - Page 41 Troubleshooting Digital DECpc LP POST and Boot Messages (continued) Message Solution Replace main logic board. No timer tick Replace main logic board. Shutdown failure Timer 2 failure Replace main logic board. Keyboard stuck key Check the keyboard connection. If the connection is secure, the keyboard or keyboard controller might...
-
Page 42: Computer Troubleshooting
Digital DECpc LP Troubleshooting Computer Troubleshooting Problem Possible Cause Action No response Main logic board failure. Replace main logic board. when the computer is Main logic board jumpers Set all appropriate jumpers. incorrectly set. turned on Brightness and contrast controls Adjust the brightness and contrast controls. - Page 43 Troubleshooting Digital DECpc LP Computer Troubleshooting (continued) Problem Possible Cause Action Operating system software is not Install the appropriate operating system. Computer does not boot from installed on the SCSI hard disk drive. an internal SCSI hard disk Requested partition does not...
-
Page 44: Disk Drive Troubleshooting
Digital DECpc LP Troubleshooting Computer Troubleshooting (continued) Problem Possible Cause Action Drive ID incorrectly set. Make sure the drive ID is correctly set (refer to the Computer does not boot from a documentation supplied with the diskette drive). target diskette drive Diskette drive not enabled. -
Page 45: Monitor Troubleshooting
Troubleshooting Digital DECpc LP Monitor Troubleshooting Problem Possible Cause Action Monitor is turned off. Turn on the monitor. Monitor power indicator is not Power indicator is defective. Replace the failed component. Configuration error. Run the BIOS SETUP UTILITY to configure the No screen computer for VGA operation. -
Page 46: Qaplus/Fe Error Messages
Digital DECpc LP Troubleshooting QAPlus/FE Error Messages Component Messages Solution Arithmetic Function Failed. Reset CPU. General Functions Failed. Replace CPU. Exception Interrupt in Protected Mode. Refresh Failure. Logic Functions Failed. Hard disk Butterfly Cylinder Access Test Low-level format hard disk. -
Page 47: Chapter 5 Device Mapping
Digital DECpc LP Device Mapping 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. -
Page 48: I/O Address Map
Device Mapping Digital DECpc LP I/O Address Map Range (hexadecimal) Function DMA controller one 000 - 00F Interrupt controller one 020 - 021 Index register (82C206, 82C496,82C497) Data register (82C206) Data register (82C496, 82C497) Interval timer 040 - 043 Keyboard controller... -
Page 49: Computer Interrupt Levels
Digital DECpc LP Device Mapping Computer Interrupt Levels Priority Interrupt Controller Interrupt Number Interrupt Source 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... -
Page 50: Chapter 6 Pass / Fail Criteria
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: Successful completion of the POST tests. Successful completion of the following QAPLUS/fe module tests (one pass): ♦... -
Page 51: Appendix A Service Notes
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... -
Page 52: Appendix B Useful Information
Digital DECpc LP Useful Information Appendix B Useful Information Related Documentation Order Number Description EK-A0899-RG DECpc LP Quick Reference Guide SMM Spares Catalogue EK-A0815-SV DECpc 300/400 LP User’s Guide ER-PC740-UA DECpc 300/400 LP Getting Started Handbook ER-PC700-GA On-Line Bulletin Boards The most current product information and technical support is also available on line. -
Page 53: Document 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. -
Page 54: Readers Comments
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.)? ....................................
Need help?
Do you have a question about the DECpc LP and is the answer not in the manual?
Questions and answers