Page 1 Foreword Notice The information in this guide is subject to change without notice. Compaq Computer Corporation shall not be liable for technical or editorial errors or omissions contained herein; nor for incidental or consequential damages resulting from the furnishing, performance, or use of this material. This document contains proprietary information protected by copyright.
Page 2 This limited warranty does not extend to any products that have been damaged as a result of accident, misuse, abuse, non Compaq modification, or as a result of service by anyone other than Compaq or an Authorized COMPAQ Computer Dealer. Except as expressly set forth above, no other warranties are expressed or implied, including, but not limited to, any implied warranties of merchantability and fitness for a particular purpose, and Compaq expressly...
Page 3 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< If necessary, the user should consult an Authorized COMPAQ Computer Dealer or any experienced radio/television technician for additional suggestions. Compaq Computer Corporation requires that all peripheral devices be connected to this computer via shielded cables with metal RFI/EMI connector hoods. Wire Type: Multipaired overall shielded;...
Page 4 Chapter 4 "DIAGNOSTIC Procedures" describes the use and function of the' COMPAQ DIAGNOSTIC Program Version 3. description of the various diagnostic routines and how to execute them. Chapter 5 "Error Messages and Codes" lists and describes the Power On Self Test (POST) and DIAGNOSTICS Error Codes.
Page 5 Diskette drive signal extension cable (PN 100546-001) Diskette drive power extension cable (PN 100545-001) Special Service Tool Kit (PN 101089-001) containing: - Power Supply socket adjustment tool - T-10 socket - 3/16 inch socket - 5/16 inch adjustable socket Additional Information The following documentation and related software are available to support these and other COMPAQ computer products.
Page 6 Chapter 1. Operating and Performance Specifications Chapter 1.1 Introduction This section provides operating and performance specifications for the COMPAQ Portable and the COMPAQ PLUS in Table 1-1, and the COMPAQ PORTABLE 286 in Table 1-2. Specifications for the COMPAQ Portable and COMPAQ PLUS Personal Computer are: Electrical and mechanical Environmental Keyboard...
Page 7 Power Cable: Length Gauge Environmental Requirements: Temperature: Operating Nonoperating Humidity: Operating Nonoperating ------------------------------------------------------------------------------ Keyboard Specifications ------------------------------------------------------------------------------ Dimensions: Height Depth Width Number of Keys Keyboard Cable: Length Gauge ------------------------------------------------------------------------------ Video Display Specifications ------------------------------------------------------------------------------ Display: Nine inch diagonal, 90 degree deflection High persistence green phosphor Etched surface to reduce glare 80 character by 25 line screen 40 character by 25 line screen...
Page 8 ------------------------------------------------------------------------------ Dimensions: Height Width Depth Weight Media Tracks per Inch Number of Cylinders Data Transfer Rate Average Access Time ------------------------------------------------------------------------------ Power Supply Specifications ------------------------------------------------------------------------------ Input Requirements: AC Voltage RMS: Domestic International Line Frequency Line Voltage Current ------------------------------------------------------------------------------ VDC Output: ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ * These values are maximum values based on nominal operating conditions for temperature, line voltage, line frequency, and altitude.
Page 9 Power Current Power Cable: Length Gauge ------------------------------------------------------------------------------ Environmental Requirements ------------------------------------------------------------------------------ Temperature: Operating Nonoperating Humidity: Operating Nonoperating ------------------------------------------------------------------------------ Keyboard Specifications ------------------------------------------------------------------------------ Dimensions: Height Depth Width Number of Keys Keyboard Cable: Length Gauge ------------------------------------------------------------------------------ Video Display Specifications ------------------------------------------------------------------------------ Display: Nine inch diagonal, 90 degree deflection High persistence green phosphor Etched surface to reduce glare 80 character by 25 line screen...
Page 10 Average Access Time Data Transfer Rate ------------------------------------------------------------------------------ 10 Megabyte Tape Drive Specifications ------------------------------------------------------------------------------ Dimensions: Height Depth Width Weight Media ------------------------------------------------------------------------------ 1.2 Megabyte Diskette Drive Specifications ------------------------------------------------------------------------------ Dimensions: Height Depth Width Weight Media Tracks per Inch Number of Tracks Data Transfer Rate ------------------------------------------------------------------------------ 360 Kbyte Diskette Drive Specifications ------------------------------------------------------------------------------...
Page 11 Cooling Current ------------------------------------------------------------------------------ VDC Output: ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ * These values are maximum values based on nominal operating conditions for temperature, line voltage, line frequency, and altitude. ============================================================================== Forced air provided by 16 VDC fan 2 amps, maximum at input voltage of 120 VAC, 60 Hz Nominal Current...
Page 12: Chapter 2.2 Power On Self Test (Post)
Chapter 2. Power On Self Tests (POST)/Problem Isolation Chapter 2.1 Introduction This section provides a list of assemblies checked by the Power On Self Test (POST) and a brief description of the types of error codes. contains preliminary steps to problem isolation of an error condition and a problem isolation flowchart for quick reference.
Page 13: Chapter 2.4 Problem Isolation Flowchart
system board between the expansion slots, is visible. Remove all non COMPAQ options (board, drives, and so on) from the computer. Install a loopback plug connector in the parallel port and the asynchronous port and any other location that requires a loopback plug. NOTE: If you want to test your printer during the printer test or to log errors to a printer, reconnect the printer now.
Page 17 Chapter 3. Setup Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on SETUP.
Page 18: Chapter 4. Diagnostic Procedures
Chapter 4. Diagnostic Procedures Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on DIAGNOSTICS.
Page 19 Chapter 5. Error Messages and Codes Chapter 5.1 Introduction This section provides Power On Self Test error messages, DIAGNOSTIC error codes, and memory error codes. The messages and codes are given in tables that list the message or error code, a description of the error, and the probable failure or required action to resolve the error condition.
Page 20 ------------------------------------------------------------------------------ 304 - Keyboard or System Unit Error ------------------------------------------------------------------------------ * See Section 5.4, "Memory Error Codes," for the location of the defective memory chip. ------------------------------------------------------------------------------ Message ------------------------------------------------------------------------------ 402 - Monochrome Display Controller Failure ------------------------------------------------------------------------------ 501 - Display Controller Failure ------------------------------------------------------------------------------ 601 - Diskette Controller Error ------------------------------------------------------------------------------...
Page 21: Chapter 5.3 Diagnostic Error Codes
------------------------------------------------------------------------------ ------------------------------------------------------------------------------ 170X ============================================================================== Chapter 5.3 Diagnostic Error Codes DIAGNOSTIC error codes occur if the system recognizes a problem while running the COMPAQ DIAGNOSTICS Program. defective subassemblies. Table 5.3 lists all possible error codes, a description of the error condition, and the action required to resolve the error condition. In each case, the required action lists prioritized steps necessary to correct the problem.
Page 22 102 - 08 287 Coprocessor wrong mask bit set in status register 102 - 15 287 socket is unoccupied, or 287 is inoperative ------------------------------------------------------------------------------ Error Error Code Description ------------------------------------------------------------------------------ 103 - 01 8237 DMA page registers test 103 - 02 8237 DMA byte controller test failed 103 - 03...
Page 23 109 - 01 CMOS clock load data test failed 109 - 02 CMOS clock rollover test failed 110 - 01 8254 load data test failed 110 - 02 8254 dynamic test failed 111 - 01 Refresh detect test failed 112 - 01 Speed test slow mode out of range 112 - 02...
Page 24 203 - 03 Error during restore of program in write/read test 204 - 01 Memory address test failed 204 - 02 Error during saving program memory in address test 204 - 03 Error during restore of program memory address test 205 - 01 Walking I/O test failed 205 - 02...
Page 25 303 - 07 Keyboard LED test, LED command test failed 303 - 08 Keyboard LED test, command byte restore test failed 303 - 09 Keyboard LED test, LEDs failed to light 304 - 01 Keyboard typomatic test failed ------------------------------------------------------------------------------ 315 - 01 Security lock is inoperative 315 - 02...
Page 26 402 - 11 Printer interrupt data, and controller register failed 402 - 12 Printer interrupt and loopback failed 402 - 13 Printer interrupt, loopback, and data register failed 402 - 14 Printer interrupt, loopback, and controller register failed 402 - 15 Printer interrupt, loopback, data, and controller register failed...
Page 27 ------------------------------------------------------------------------------ Error Error Code Description ------------------------------------------------------------------------------ 516 - 01 Lightpen text mode test failed - no response 516 - 0 Lightpen text mode test failed - invalid response 516 - 03 Lightpen medium resolution mode test failed - no response 516 - 04 Lightpen medium resolution mode test - invalid response...
Page 28 610 - 03 Previously exceeded max soft error limit 610 - 04 Previously exceeded max hard error limit 610 - 05 Failed to reset controller 610 - 06 Fatal error while reading 610 - 07 Fatal error while writing 610 - 08 Failed compare of write/ read/compare ------------------------------------------------------------------------------...
Page 29 1101 - 02 Serial Port Test, Line input or UART fault 1101 - 03 Serial Port Test, Address line fault 1101 - 04 Serial Port Test, Data line fault 1101 - 05 Serial Port Test, UART control signal 1101 - 06 Serial Port Test, ART THRE bit failure 1101 - 07...
Page 30 line failure 1109 - 06 Serial Clock Test, data line failure ------------------------------------------------------------------------------ Error Error Code Description ------------------------------------------------------------------------------ Fixed Disk Drive 17yy - xx ------------------------------------------------------------------------------ 1700 - xx Fixed disk drive ID drive test type 1701 - xx Fixed disk drive format test 1702 - xx Fixed disk drive read test...
Page 31 1716 - 02 Exceeded maximum hard error limit 1716 - 03 Previously exceeded maximum soft error limit 1716 - 04 Previously exceeded maximum hard error limit 1716 - 05 Failed to reset controller 1716 - 06 Fatal error while reading 1716 - 07 Fatal error while writing 1716 - 08...
Page 32 1716 - 51 Failed file I/O test in read test 1716 - 52 Failed file I/O test in compare test 1716 - 53 Failed drive/head register test 1716 - 54 Failed digital input register test 1716 - 55 Cylinder 1 failed 1716 - 56 Controller RAM failed 1716 - 57...
Page 33: Chapter 5.4 Memory Error Codes
1906 - 07 Tape already servo written ------------------------------------------------------------------------------ Error Error Code Description ------------------------------------------------------------------------------ Tape Drive 19yy - xx ------------------------------------------------------------------------------ 1906 - 08 Unable to servo write 1906 - 09 Unable to format 1906 - 10 Format mode error 1906 - 11 Drive recalibration error 1906 - 12 Tape not servo written...
Page 34 The memory error code points to a specific memory address. location of the memory address depends on the type of system, the number and type of memory boards installed, and the type of memory device used (64 Kbyte RAMs or 256 Kbyte RAMs). COMPAQ PORTABLE 286 Memory Error Codes Memory error codes are in the XX000B YYZZ format.
Page 35 ============================================================================== Table 5.4-2. Defective Memory Chip Isolation Map for the COMPAQ PORTABLE 286 System Board Using 256 Kbyte RAMs (0 - 640 Kbytes) ============================================================================== XX = 00 Bank 0 ------------------------------------------------------------------------------ Data Bit B = 0 YY or ZZ ------------------------------------------------------------------------------ ============================================================================== Table 5.4-3.
Page 36 ============================================================================== COMPAQ Portable and COMPAQ PLUS Memory Error Codes Memory error codes for the COMPAQ Portable and COMPAQ PLUS Personal Computers will appear in an "XXYY 201" format. XX - Denotes the beginning address of the error code (or the bank in which the error occurred) YY - Denotes the failed bit Once all corrections have been completed and all boards have been reinstalled...
Page 37 1000 201 Bank 1, Parity Bit 1001 201 Bank 1, Data Bit 0 1002 201 Bank 1, Data Bit 1 1004 201 Bank 1, Data Bit 2 1008 201 Bank 1, Data Bit 3 ------------------------------------------------------------------------------ * Location of Failed Chip if using Alternate Bank 2 and 3. ------------------------------------------------------------------------------ Error Failure...
Page 38 ------------------------------------------------------------------------------ * Location of Failed Chip if using Alternate Bank 2 and 3. ============================================================================== Table 5.4-5. COMPAQ Portable and COMPAQ PLUS Extended Memory Codes ============================================================================== xx Code Beginning Address ------------------------------------------------------------------------------ 40yy 201 256 Kbytes 48yy 201 288 Kbytes 50yy 201 320 Kbytes 58yy 201 352 Kbytes...
Page 39: Chapter 6. Illustrated Parts Catalog
Chapter 6. Illustrated Parts Catalog Chapter 6.1 Illustrated Parts List for Compaq Portable and Compaq Plus Personal Computers Section 6.1 provides a reference for specific COMPAQ Portable and COMPAQ PLUS Computer part (or parts kit) numbers used to place parts orders with Compaq Computer Corporation.
Page 40 100374-001 ** 100487-001 ** --------------------------------------------------------------------------- ** Part number no longer available. ============================================================================== Table 6.1-2. COMPAQ Portable and COMPAQ PLUS Personal Computers Parts List: Chassis (Front) ============================================================================== Item Number Part Number ------------------------------------------------------------------------------ 100025-001 ** 100025-001 ** 100025-001 ** 101097-001 ** 101098-001 ** 100025-001 ** 101750-001 ** 102709-001 *...
Page 41 100031-001 ** ------------------------------------------------------------------------------ * This part is included in the Miscellaneous Hardware Kit (PN 102709-001). ** Part number no longer available. ============================================================================== Table 6.1-3. COMPAQ Portable and COMPAQ PLUS Personal Computers Parts List: Common Chassis (Front) ============================================================================== Item Number Part Number ------------------------------------------------------------------------------ 105034-001 ** 102709-001 *...
Page 42 100512-001 *** ** 101341-001 ** 101750-001 ** 100643-001 ** 100437-001 ** 101421-001 ** 101031-001 ** ------------------------------------------------------------------------------ These parts are included in the Miscellaneous Hardware Kit (PN 102709-001). *** These parts are included in the Cable Kit (PN 100512-001 **). Part number no longer available. ============================================================================== Table 6.1-4.
Page 43 100482-001 ** 102709-001 * 102709-001 * 100478-001 ** 100478-001 ** 102709-001 * 101798-001 ** 102930-001 102709-001 * 100439-001 ** ------------------------------------------------------------------------------ These parts are included in the Miscellaneous Hardware Kit (PN 102709-001). Part number no longer available. *** For portable computers with serial number 1524020B0001 or above. For portable computers with serial numbers below 1524020B0001.
Page 44 100512-001 * ** 100493-001 ** 100442-002 ** ------------------------------------------------------------------------------ * This part is contained in the Cable Kit (PN 100512-001 **). ** Part number no longer available. ============================================================================== Table 6.1-6: COMPAQ Portable and COMPAQ PLUS Personal Computers Parts List: System Chassis (Front) ============================================================================== Item Number Part Number...
Page 45 102709-001 * 102709-001 * ------------------------------------------------------------------------------ * These parts are included in the Miscellaneous Hardware Kit (PN 102709-001). ** Part number no longer available. ============================================================================== Chapter 6.2 Illustrated Parts List for Compaq Portable 286 Personal Computer Section 6.2 provides a reference for specific COMPAQ PORTABLE 286 Personal Computer part (or parts kit) numbers used to place part orders with Compaq Computer Corporation.
Page 46 Item Number Part Number ------------------------------------------------------------------------------ 101710-001 100374-001 ** 101790-001 ** --------------------------------------------------------------------------- ** Part number no longer available. ============================================================================== Table 6.2-2. COMPAQ PORTABLE 286 Personal Computer Parts List: Chassis (Front) ============================================================================== Item Number Part Number ------------------------------------------------------------------------------ 100025-001 ** 100025-001 ** 100025-001 ** 101097-001 ** 101098-001 ** 100025-001 **...
Page 47 101097-001 ** 102709-001 * 100031-001 ** ------------------------------------------------------------------------------ * These parts are included in the Miscellaneous Hardware Kit (PN 102709-001). ** Part number no longer available. ============================================================================== Table 6.2-3. COMPAQ PORTABLE 286 Personal Computer Parts List: Common Chassis (Front) - A ============================================================================== Item Number Part Number...
Page 48 102933-001 *** ** 105033-001 ** 102933-001 *** ** 101750-001 ** 102778-001 ------------------------------------------------------------------------------ These parts are all included in the Miscellaneous Hardware Kit (PN 102709-001). *** These parts are all included in the Cable Kit (PN 102933-001 **). Part number no longer available. ============================================================================== Table 6.2-4.
Page 49 101732-001 ** 102706-001 ** 102709-001 * 102775-001 102928-001 102779-001 ** 101299-001 ** 101488-001 ** 102709-001 * ------------------------------------------------------------------------------ * These parts are all included in the Miscellaneous Hardware Kit (PN 102709-001). ** Part number no longer available. ============================================================================== Table 6.2-5. COMPAQ PORTABLE 286 Personal Computer Parts List: Mechanical Chassis (Rear) ============================================================================== Item Number...
Page 50 101796-001 ** 102709-001 * 102709-001 * 101795-001 ** 101795-001 ** 102709-001 * 102709-001 * 101798-001 ** 102930-001 100439-001 ** 102929-001 (replaced by 160272-001) ------------------------------------------------------------------------------ * These parts are all included in the Miscellaneous Hardware Kit (PN 102709-001). ** Part number no longer available. ============================================================================== Table 6.2-6.
Page 51 ------------------------------------------------------------------------------ 105034-001 ** 102933-001 * ** 100493-001 ** 100442-002 ** 102933-001 * ** ------------------------------------------------------------------------------ * These parts are all included in the Cable Kit (PN 102933-001 **). ** Part number no longer available. ============================================================================== Table 6.2-7. COMPAQ PORTABLE 286 Personal Computer Parts List: System Chassis (Front) ============================================================================== Item Number...
Page 52 102709-001 * 101750-001 ** 102709-001 * 102709-001 * ------------------------------------------------------------------------------ These parts are all included in the Miscellaneous Hardware Kit (PN 102709-001). *** This part is included in the Cable Kit (PN 102933-001 **). Part number no longer available. ============================================================================== Drive Shock Mount System Chassis Assembly Tie Wrap Push Mount...
Page 53 Chapter 7. Removal and Replacement Procedures Chapter 7.1 Introduction Before starting removal procedures, review Chapter 6, "Illustrated Parts Catalog," to become familiar with the various part names and locations. Removal and replacement procedures in this section are written generically for all COMPAQ Portable Computers, except in cases where procedures differ because of design differences.
Page 54 Disconnect any peripheral devices (printer, monitors, and so on) from the computer. Disconnect the AC power cord from its power source and from the computer (Figure 7.2-2). Chapter 7.3 Access Cover Removal and Replacement...
Page 55 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Before removing the access cover from the COMPAQ Portable Computer, complete the Preparation Procedure in Section 7.2. preparation portion of this section, do so before continuing this procedure. Failure to disconnect the computer from all AC voltage sources can cause dangerous voltages to be present on the power supply and monitor.
Page 56 To remove the other access panel, turn the computer over so that the remaining cover is facing up. To replace either the top or bottom access cover, position the tabs on the cover under the bezel, and snap the cover onto the case. Chapter 7.4 Board Slots Access Plate Removal and Replacement >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<...
Page 57 up from the system chassis and lifting it away from the computer. To replace the board slots access plate, reverse Steps 1 through 3. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Ensure that the retainers on the bottom side of the board slots access plate fit securely onto each board installed in your computer. board of a different height, rotate the retainers to match the height of the board.
Page 58 To remove the mass storage device access plate: Remove the board slots access plate (see Section 7.4). Loosen (DO NOT REMOVE) the five retaining screws that secure the mass storage device access plate (Figure 7.6-1). Remove the disk drive mounting screws and slide the access plate toward the rear of the computer (Figure 7.6-1).
Page 59 Place the computer so that the display is facing downward against the work surface. Locate and loosen (DO NOT REMOVE) the two screws that secure the system board connector access plate. Remove the access plate by sliding it slightly down and away from the chassis (Figure 7.7-1).
Page 60 COMPAQ Portable Power Supply Subsystem Removal and Replacement (for COMPAQ Portable and COMPAQ PLUS Personal Computers with serial numbers below 1524020B0001) This power supply subsystem consists of the AC line fuse, the power switch filter assembly, the power supply assembly, and the fan/bracket assembly. COMPAQ Portable AC Line Fuse Removal and Replacement To remove and replace the COMPAQ Portable AC line fuse: Complete the Preparation Procedure (see Section 7.2).
Page 61 Once the fuse box is out, you will see a spare fuse in a holding area in the fuse box (Figure 7.8-3). with the spare fuse. Slide the fuse box back into the case. in until you feel it snap into place. Reconnect all cables removed earlier.
Page 62 NOTE: If the fuse has been replaced a number of times, the fuse clips may lose their tension and not make good contact with the fuse. clips and, if necessary, squeeze them gently with needlenosed pliers or replace the assembly. COMPAQ Portable Power Switch Filter Assembly Removal and Replacement To remove the COMPAQ Portable power switch filter assembly: Complete the High Voltage Access Plate Removal procedure (see...
Page 63 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry. connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Remove the 1/4 inch hex nut that secures the power switch filter assembly ground strap, and carefully lift the power switch filter assembly up and away from the computer (Figure 7.8-6).
Page 64 To replace the power switch filter assembly, reverse Steps 1 through 5. COMPAQ Portable Power Supply Assembly Removal and Replacement To remove the COMPAQ Portable power supply assembly: Complete the High Voltage Access Plate Removal procedure (see Section 7.5). Remove the power switch filter assembly. Disconnect the remaining fan connector from the power supply assembly (Figure 7.8-7).
Page 65 Using the two piece socket tool and the socket or a 5/16 inch box end wrench, unscrew the spring loaded hexhead screw that is on the lower corner of the power supply assembly (Figure 7.8-8). Partially close the access door panel to allow the standoffs to disengage the chassis.
Page 66 releases the power supply assembly from the chassis. Carefully lift the power supply assembly out of the chassis and gently remove all remaining connectors from the board (Figure 7.8-9). To replace the power supply assembly, reverse Steps 1 through 7. NOTE: Be sure to securely tighten the mounting screw with the 5/16 inch box end wrench because using only the socket extension wrench may not securely...
Page 67 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry. connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Open the access door panel. Remove the four screws that hold the fan/bracket assembly in place (Figure 7.8-11). CAUTION Pulling on the wires makes the...
Page 68 Carefully lift the fan/bracket assembly out and away from the chassis (Figure 7.8-12). Route the fan cable through the access hole and chassis. To replace the fan/bracket assembly, reverse Steps 1 through 5. COMPAQ PORTABLE 286 Power Supply Subsystem Removal and Replacement (also for COMPAQ Portable and COMPAQ PLUS Personal Computers with serial number 1524020B0001 or above) The power supply subsystem consists of the AC line fuse, the fan/bracket...
Page 69 assembly, the power supply assembly, and the power switch filter assembly. COMPAQ PORTABLE 286 AC Line Fuse Removal and Replacement To remove the AC line fuse: Complete the Preparation Procedure (see Section 7.2). Slide the access door panel open to expose the power switch filter assembly (Figure 7.8-13).
Page 70 Once the fuse box is out, you will see a spare fuse in a holding area in the fuse box (Figure 7.8-15). with the spare one. NOTE: If the fuse has been replaced a number of times, the fuse clips may lose their tension and not make good contact with the fuse.
Page 71 Slide the fuse box back into place. snap into place. COMPAQ PORTABLE 286 Fan/Bracket Assembly Removal and Replacement To remove the fan/bracket assembly: Complete the High Voltage Access Plate Removal procedure (see Section 7.5). Open the access door panel. Loosen (DO NOT REMOVE) the screw that secures the fan/bracket assembly to the chassis (at the rear of the monitor).
Page 72 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< CAUTION Pull only on the connector, do not pry. Pulling on the wires makes the connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Lift the fan/bracket assembly up and out of the computer (Figure 7.8-18).
Page 73 To replace the fan/bracket assembly, reverse Steps 1 through 6. COMPAQ PORTABLE 286 Power Supply Assembly Removal and Replacement To remove the Power Supply Assembly: Complete the Fan/Bracket Assembly Removal procedure. Carefully disconnect the power switch filter assembly connector from the power supply assembly (Figure 7.8-19).
Page 74 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry. connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Using the special two piece socket tool or 5/16 inch box end wrench, loosen the power supply mounting screw from the upper (or lower) right corner of the power supply assembly (Figure 7.8-20).
Page 75 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry. connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< To replace the power supply assembly, reverse Steps 1 through 6. NOTE: Be sure to securely tighten the mounting screw with the 5/16 inch box end wrench because using only the socket extension wrench may not securely tighten the mounting screw (thereby causing grounding problems).
Page 76 Remove the 1/4 inch hex nut and the tie wrap that hold the power switch ground cable. Lift the power switch filter assembly out and place it on the chassis (Figure 7.8-23). Disconnect the power switch filter assembly connector from the power supply assembly (Figure 7.8-24).
Page 77 To replace the power switch filter assembly, reverse Steps 1 through 5. Chapter 7.9 Controller and Expansion Board Removal and Replacement Before beginning this procedure, become familiar with the locations of controller and Controller Board expansion boards and their specific signal cables, if applicable (Figure 7.9-1).
Page 78 To remove the fixed disk drive controller board: Complete the Board Slots Access Plate Removal procedure (see Section 7.4). Disconnect the two fixed disk drive controller board signal cables by pulling the connectors away from the board (Figure 7.9-2). >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry.
Page 79 NOTE: Controller and expansion board retaining screws may be located either inside or outside the chassis. To replace the fixed disk drive controller board, reverse Steps 1 through 3. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Ensure that the retainers on the bottom side of the board slots access plate fit securely onto each board installed in your computer.
Page 80 Remove the retaining screw that secures the video display controller board and disconnects the video display signal cable (Figure 7.9-4). NOTE: Controller and expansion board retaining screws may be located either inside or outside the chassis. A tie wrap secures the video display signal cable. before disconnecting the signal cable from the video display controller board.
Page 81 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry. cable. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Gently pull the video display controller board up and out of its socket (J102 on COMPAQ PORTABLE 286 Personal Computers; J104 on COMPAQ Portable and COMPAQ PLUS Personal Computers) on the system board and out of the computer (Figure 7.9-5).
Page 82 Disconnect the diskette/tape controller board signal cable by pressing the finger tabs (if available) that are located on both sides of the connector (Figure 7.9-6). Remove the retaining screw that secures the diskette/tape controller board. Gently pull the board up and out of its socket (J101 on COMPAQ PORTABLE 286 Personal Computers;...
Page 83 Computers) on the system board. NOTE: Controller and expansion board retaining screws may be located either inside or outside the chassis. To replace the diskette/tape controller board, reverse Steps 1 through 5. NOTE: Ensure that the retainers on the bottom side of the board slots access plate fit securely onto each board installed in the computer.
Page 84 To replace the expansion board, reverse Steps 1 through 4. NOTE: Ensure that the retainers on the bottom side of the board slots access plate fit securely onto each board installed in the computer. to a board of a different height, rotate the retainers to match the height of the board.
Page 85 o Monitor power connector (COMPAQ PORTABLE 286 only) o Battery connector (COMPAQ PORTABLE 286 only) o Speaker connector See Figure 7.10-1 for the location of each of these connectors. NOTE: Once the battery connector has been disconnected from the COMPAQ PORTABLE 286 system board, reset the time function found in MS-DOS or in SETUP.
Page 86 Slide the system board to the rear, lifting it slightly upward, so that the six nylon standoffs (attached to the bottom of the system board) clear the mounting holes. chassis (Figure 7.10-3). To replace the system board, reverse Steps 1 through 6. Memory Option Removal and Replacement To remove an optional memory or ROM: Carefully lift the system board out of the...
Page 87 Remove the system board. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< The pins on the chips bend easily. should be inserted so that it faces toward the board slots. can make the chip unusable. are in the socket and that none are bent or are outside of the socket. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<...
Page 88 Using the special IC removal tool, remove the defective memory or ROM chip(s) (Figure 7.10-6). Using the special IC insertion tool, replace the defective memory or ROM chip(s) (Figure 7.10-7).
Page 89 To replace the system board, reverse Steps 1 through 6, which are presented at the beginning of this section. NOTE: After replacing any defective component, run the latest version of DIAGNOSTICS to verify that the replaced component functions properly. Chapter 7.11 Mass Storage Device Removal and Replacement Mass storage devices are installed in two drive enclosures.
Page 90 The mass storage devices have different configurations depending on the computer model. Determine the configuration of the mass storage devices. COMPAQ Portable and COMPAQ PLUS Personal Computers o Enclosure A contains: diskette drive ONLY. o Enclosure B contains: diskette drive or fixed disk drive. COMPAQ PORTABLE 286 Personal Computers o Enclosure A contains: diskette drive and blank panel or diskette drive and...
Page 91 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< CAUTION Pull only on the connector, do not pry. Pulling on the wires makes the connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Raise the computer as shown in Figure 7.11-3.
Page 92 Remove the two shock mount screws. Return the computer to its flat position on the work surface. Remove the top mounting screw from Enclosure B (Figure 7.11-4). Slide Enclosure B towards the rear of the system chassis, lift it from the chassis, and let it rest on the side of the chassis.
Page 93 If Enclosure B contains a fixed disk drive, disconnect the fixed disk drive LED connector from the front of the enclosure and remove this enclosure from the system chassis (Figure 7.11-5). NOTE: If Enclosure B is a fixed disk drive replacement for a COMPAQ Portable or COMPAQ PLUS Personal Computer, it may be necessary to remove the face plate/LED assembly that is attached to the chassis.
Page 94 Disconnect any power cables that may be connected to sockets J114 or J115 on the system board (Figure 7.11-6) of a COMPAQ PORTABLE 286 Personal Computer. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry. connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<...
Page 95 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< On COMPAQ PORTABLE 286 Personal Computers, three bottom mounting screws are used to secure Enclosure A. Enclosure B. To avoid damaging the drives, return the correct screws to the correct locations when replacing the drive assemblies. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Return the computer to its flat position on the work surface and remove the top Enclosure A mounting screw (Figure 7.11-8).
Page 96 Slide Enclosure A to the rear of the computer and lift it up and out of the computer (Figure 7.11-9). >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< When removing the enclosure do not bend the ground strap located on the top CAUTION...
Page 97 front shock mount of each enclosure. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< NOTE: If removing a diskette drive or tape drive in a COMPAQ PORTABLE 286, continue with the procedures in this section. At this point, determine which device in Enclosure A is to be removed. guide refers to the device closest to the monitor as 1A and the other device as 2A (Figure 7.11-10).
Page 98 To replace Device 2A, reverse Step 9. NOTE: Replace the drive insulator pad if it was removed when replacing devices in this enclosure. To remove Device 1A from the enclosure: Remove the two mounting screws from each side of Enclosure A and slide the device out of the enclosure (Figure 7.11-12).
Page 99 To replace Device 1A, reverse Step 10. To replace Enclosure A, reverse Steps 1 through 8. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< On COMPAQ PORTABLE 286 Personal Computers, three bottom mounting screws are used to secure Enclosure A. Enclosure B. To avoid damaging the drives, return the correct screws to the correct locations when replacing the drive assemblies.
Page 100 To remove the monitor enclosure assembly: Complete the removal procedures for all installed controller and option boards (see Section 7.9). Remove mass storage device Enclosure A (see Section 7.11). Remove the fan/bracket assembly (see Section 7.8). NOTE: For COMPAQ Portable and COMPAQ PLUS Personal Computers with serial numbers below 1524020B0001, it is necessary to remove the power switch filter assembly INSTEAD of the fan/bracket assembly.
Page 101 bottom of the chassis (Figure 7.12-3). Return the computer to its flat position on the work surface. Remove the last two screws that secure the monitor enclosure to the top front of the chassis (Figure 7.12-4) Disconnect the monitor power signal connector from the monitor sweep board (Figure 7.12-4)
Page 102 For the COMPAQ Portable and COMPAQ PLUS Personal Computers, disconnect the power cable connector from the sweep board. To remove the monitor enclosure from the chassis: Carefully slide the monitor enclosure away from the power supply subsystem until the enclosure clears the tab in the back corner of the monitor.
Page 103 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Pull only on the connector, do not pry. connector grip the pins tighter, which will damage the connector. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Position the computer with the keyboard facing you. and gently pull the keyboard cable out through the front bezel (Figure 7.13-2). CAUTION Pulling on the wires makes the Unlock the keyboard...
Page 104 To replace the keyboard assembly, reverse Steps 1 through 3. Chapter 7.14 Security Lock Switch Assembly Removal and Replacement The following procedures are for the COMPAQ PORTABLE 286 Personal Computer ONLY. The security lock switch assembly consists of the lock and a lock switch. To remove the security lock switch assembly: Complete removal procedures for all installed controller and expansion boards (see Section 7.9).
Page 105 Remove mass storage device Enclosure B (See Section 7.11). Unlock the keyboard from the front of the computer. Locate the security lock switch assembly on the Enclosure B front plate. Remove the security lock switch assembly by removing the speed clip that secures the assembly in place on the Enclosure B front plate (Figure 7.14-2).
Page 106: Chapter 7.15 Battery Removal And Replacement
Cut all tie wraps that secure the switch cable to the chassis. To replace the security lock switch assembly, reverse Steps 1 through 7. Chapter 7.15 Battery Removal and Replacement NOTE: This procedure is to be performed by Authorized COMPAQ Dealers ONLY. To remove the battery: Complete the system board removal procedure (see Section 7.10 and Figure 7.15-1).
Page 107 NOTE: When the battery is disconnected, rerun SETUP when the battery is replaced if CMOS memory has not retained the information entered during SETUP. To replace the battery, reverse Steps 1 through 3.
Page 108 Chapter 8. Jumper Settings, Switch Settings, and Adjustments Chapter 8.1 Introduction This section details the switch and jumper settings for the COMPAQ Portable, COMPAQ PLUS, and COMPAQ PORTABLE 286 Personal Computers. This section contains external pin assignments for the COMPAQ PORTABLE 286 Diskette/Tape Controller Board and the COMPAQ Asynchronous Communications/ Clock Board.
Page 110 Table 8-2. COMPAQ Portable and COMPAQ PLUS Video Display Controller Board Jumper Settings ============================================================================== Jumper Location Function ------------------------------------------------------------------------------ J3, J5 Enables/disables RGB and composite video outputs in high resolution ------------------------------------------------------------------------------ NOTE: Jumpers J3 and J5 must both be changed at the same time or the video display controller board will malfunction.
Page 111 Chapter 8.4 Compaq Portable 286 System Board Jumper Settings Table 8.4 lists the various combinations of jumper settings for the COMPAQ PORTABLE 286 board. For the location of the COMPAQ PORTABLE 286 system board jumpers, see Figure 8.4-1. If the speed select jumper (ES) is changed to the 6 MHz speed (pin 2 to pin 3), the system will operate only at a 6 MHz clock speed and will not respond to speed change requests from the keyboard when the CTRL + ALT + \ keys are pressed.
Page 112 If both a monochrome video display controller board (with external monochrome display) and a COMPAQ video display controller board are installed, the monochrome video display will be active during power on if the display select jumper (ED) is set on pin 1 to pin 2. Table 8.4.
Page 113 Table 8.5 lists the various combinations of switch and jumper settings for both versions of the COMPAQ PORTABLE 286 diskette/tape controller board. For the locations of the COMPAQ PORTABLE 286 diskette/tape controller board jumpers and switch, see Figure 8.5-1. Table 8.5. COMPAQ PORTABLE 286 Diskette/Tape Controller Board Jumper and Switch Settings ==============================================================================...
Page 114 ------------------------------------------------------------------------------ Diskette/tape controller board base address select COM1/COM2 select Printer enabled Communications Interrupt select ------------------------------------------------------------------------------ When changing the asynchronous communications port, both the COM1/COM2 address select (J2) and the IRQ3/IRQ4 interrupt select (J4) must be changed. is selected, the interrupt IRQ4 must be selected. interrupt IRQ3 must be selected.
Page 115 the COMPAQ PORTABLE 286 system board. 64 Kbyte RAM Chips - BASE 256 Kbytes 256 Kbyte RAM Chips - BASE 640 Kbytes or * 512 Kbytes * For optional 512 Kbyte configuration, a PAL (PN 105045-001) must be installed in U2, if not already present. Table 8.6 lists the jumper settings and the banks for memory expansion.
Page 116 Board Version 1 Bank 0 contains 64 Kbytes of soldered in memory in nine, 64K x 1 RAM chips. Bank 1 also contains 64 Kbytes of soldered in memory in nine, 64K x 1 RAM chips, for a system total of 128 Kbytes. Bank 2 consists of nine sockets that can be populated with either 64K x 1 RAM chips or 256K x 1 RAM chips.
Page 117 The SW1 and SW2 switch settings on the system and define the configuration for the computer system. See Figure 8.7-2 for the switch functions and Tables 8.7-1 and 8.7-2 for the switch position settings. Table 8.7-1. SW1 Switch Position Settings ============================================================================== Position ------------------------------------------------------------------------------...
Page 118 ------------------------------------------------------------------------------ NOTE: Do not use a graphite pencil to change the switch setting. ============================================================================== Table 8.7-2. SW2 Switch Position Settings ============================================================================== Position ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ NOTE: Do not use a graphite pencil to change the switch setting. ============================================================================== SW1 tells the system the number of diskette drives available, the type of display to be expected, and whether an 8087 coprocessor is used in the system.
Page 119 Bank 3 also consists of eight sockets that can be populated either with 64K x 1 RAM chips or 256K x 1 RAM chips. In addition to Banks 2 and 3, Version 2 also contains Alternate Bank 2 and Alternate Bank 3. Sockets in both Alternate Bank 2 and 3 can each be populated with two 64K x 4 RAM chips.
Page 120: Jumper Settings
Chapter 8.8 Compaq Portable and Compaq Plus Asynchronous Communications/Clock Board Jumper Settings Jumpers on the COMPAQ Portable and COMPAQ PLUS asynchronous communications/ clock board determine the communications address and the interrupt selection on the board. Device U13 allows the selection of a 20 mA current loop operation rather than the standard RS-232-C voltage operation.
Page 121 ============================================================================== When changing the COM1/COM2 address of the serial port, both jumpers J702 and J703 must be changed to correctly select the option desired. selected, the IRQ4 must be selected. selected. Chapter 8.9 Output Connector Pin The following tables provide the output connector pin assignments: Table 8.9-1: 25 pin asynchronous connector Table 8.9 2:...
Page 122 Table 8.9-1. 25 Pin Asynchronous Connector ============================================================================== Signal Names and Description ------------------------------------------------------------------------------ Protective Ground Transmit Data (TX) Receive Data (RX) Request To Send (RTS) Clear To Send (CTS) Data Set Ready (DSR) Signal Ground (GND) Carrier Detect (CD) + Transmit current loop data (20 mA) + 5 VDC 200 mA (fuse on board) - Transmit current loop return (20 mA) Reverse Channel Option...
Page 123 + Receive current loop data (20 mA) No Connection Data Terminal Ready (DTR) No Connection Ring Indicator (RI) * EIA ON + 12V Option * EIA OFF - 12V Option - Receive current loop return (20 mA) ------------------------------------------------------------------------------ * Pins 23 and 24 - No connection on the full height Serial Interface Board. ============================================================================== Table 8.9-2.
Page 124 Table 8.9-3. 9 Pin Serial Connector ============================================================================== Signal Names and Description ------------------------------------------------------------------------------ Carrier Detect (CD) Receive Data (RX) Transmit Data (TX) Data Terminal Ready (DTR) Signal Ground (GND) Data Set Ready (DSR) Request To Send (RTS) Clear To Send (CTS) Ring Indicator (RI) ============================================================================== Chapter 8.10 Diskette Drive Speed Adjustment Procedure...
Page 125 drive controller board to the diskette drive power and signal connectors of the drive being tested (See Chapter 7, "Removal and Replacement Procedures"). Insert the DIAGNOSTICS diskette into drive A and turn on the system power. Follow the procedures given in Chapter 4, "Diagnostic Procedures," to bring up the menu similar to the one in Screen 1.
Page 126 IS THIS THE CORRECT FORMAT The number of tracks for a 320 Kbyte diskette is 40 and the number of sectors is 8. For a 360 Kbyte diskette, the number of tracks is 40 and the number of sectors is 9. For a 1.2 megabyte diskette, the number of tracks is 80 and the number of sectors is 15.
Page 127 COMPAQ PORTABLE 286 Personal Computers will operate properly at a speed within plus or minus 2 percent of the specified value. practice to adjust the speed to within plus or minus 1 percent of the specified value. After you adjust the diskette drive speed, press any key to exit from the test program.
Page 128 Using the label on the high voltage access plate as a guide, locate and adjust the BRITE control until the screen raster appears on the display. Check this display to make sure it is not tilted in any way. NOTE: Do not use excessive force when making adjustments on the video display unit.
Page 129 display unit. Use the CTRL + ALT + < command to place the display in the low resolution graphics mode. Press and hold down the CTRL and the ALT key and press the less than (<)key. tool, adjust the MASTER HT control pot so that all characters appear at the desired height.

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