Compaq Portable 386 Compaq Portable 386 Personal Computer Maintenance and Serv
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- Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 1
. The strap is not necessary if a shielded cable connects the two chassis. COMPAQ PORTABLE 386 PERSONAL COMPUTER MAINTENANCE AND SERVICE GUIDE is a troubleshooting guide that can be used as a reference when servicing the COMPAQ PORTABLE 386 Personal Computer. Compaq Computer Corporation reserves - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 2
make changes in its COMPAQ PORTABLE 386 Personal Computer without notice. Accordingly, the diagrams and procedures in this document may not apply to the computer you are servicing. CAUTION Only trained technicians should attempt to repair this equipment. All troubleshooting and repair procedures - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 3
problems that can occur with the COMPAQ PORTABLE 386 Personal Computer during the Power On Self Test procedure. Chapter 4. SETUP AND INSPECT (See SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE.) Chapter 5. DIAGNOSTICS PROGRAM (See SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE.) Chapter - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 4
available to support these and other COMPAQ computer products: o COMPAQ PORTABLE 386 PERSONAL COMPUTER OPERATIONS GUIDE (PN 107918-001) o COMPAQ PORTABLE 386 PERSONAL COMPUTER TECHNICAL REFERENCE GUIDE (PN 107920-001) o COMPAQ PORTABLE 386 PERSONAL COMPUTER MEMORY EXPANSION INSTALLATION GUIDE (PN - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 5
PN 114496-001) o MS-DOS VERSION 3 REFERENCE GUIDE (PN 114024-001) o BASIC VERSION 3 REFERENCE GUIDE (PN 104030-001) o MICROSOFT Operating System/2 Standard Version 1.1 o Service Advisories and Bulletins o HOW TO DO BUSINESS WITH COMPAQ SERVICE o COMPAQ SERVICE QUICK REFERENCE GUIDE (PN 106854-001) - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 6
for the COMPAQ PORTABLE 386 Personal Computer system unit. Table 2-1. Electrical and Mechanical Specifications Dimensions: Height 9.8 in. (24.8 cm) Depth 7.8 in. (19.8 cm) Width 16.0 in. (40.6 cm) Weight: Model 40 20 lb (9.1 kg) Model 100 21 lb (9.5 kg) Model 110 21 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 7
Enhanced Keyboard Table 2-2 lists the specifications for the portable enhanced keyboard. Table 2-2. Keyboard Assembly Specifications Dimensions: Height 1.2 in. ( 3.0 cm) Depth 7.1 in. (18.0 cm) Width 15.8 in. (40.1 cm) Cable Length: Compressed Extended 8.0 in. (20.3 cm) 30.0 in. (76 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 8
640 x 400 (80 characters x 25 lines) Chapter 2.5 1.2 Megabyte Diskette Drive Table 2-4 lists specifications for the 1.2 megabyte diskette drive. Table 2-4. 1.2 Megabyte Diskette Drive Specifications Dimensions: Height 1.1 in. (2.8 cm) Depth 8.0 in. (20.3 cm) Width 5.8 in. (14 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 9
(720 Kbyte format) Bytes per Sector 512 Chapter 2.8 40 Megabyte Fixed Disk Drive Table 2-7 lists the specifications for the 40 megabyte fixed disk drive. Table 2-7. 40 Megabyte Fixed Disk Drive Specifications Dimensions: Height 1.5 in. (3.8 cm) Depth 4.0 in. (10.2 cm) Width 5.8 in - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 10
Fixed Disk Drive Table 2-8 lists the specifications for the 100 megabyte fixed disk drive. Table 2-8. 100 Megabyte Fixed Disk Drive Specifications Dimensions: Height 1.6 in. (3.8 cm) Depth 5.8 in. (14.6 cm) Width 4.0 in. (10.2 cm) Weight 2.9 lb. (1.9 kg) Drive Type (used in SETUP - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 11
Fixed Disk Drive Specifications Dimensions: Height 1.62 in. (4.1 cm) Depth 5.75 in. (14.6 cm) Width 4.00 in. (10.2 cm) Weight 1.8 lb (0.81 kg) Drive Type 33 (Used in SETUP program) Number of Logical Data Heads 8 Number of Logical Cylinders 832 Average Access Time less than 25 ms - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 12
for the 40 megabyte tape drive expansion unit. Table 2-13. 40 Megabyte Tape Drive Expansion Unit Specifications Dimensions: Height 6.0 in. (15.2 cm) Depth 2.4 in. (6.1 cm) Width 14.5 in. (36.8 cm) Media: Tracks per Inch 83 Number of Tracks 20 Data Transfer Rate 500 Kb - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 13
Disk Drive Expansion Unit Table 2-15 lists the specifications for the 300/600 Megabyte Fixed Disk Drive Expansion Unit. Table 2-15. 300/600 Megabyte Fixed Disk Drive Expansion Unit Specifications Dimensions than 140oF (-30oC to 60oC) Humidity: Operating Not less than 20% or more than 80% - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 14
in one 8/16 bit expansion slot in the system unit. External Interface Adapter External interface adapter supports one or two 300 megabyte fixed disk drives LED Indicator Green Power Requirements: U.S. International ---- Nominal Line Voltage 120 VAC, 60 Hz 230 VAC, 50 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 15
COMPAQ PORTABLE 386 Personal Computer when the system is turned on. POST checks the following assemblies to ensure that the computer system is functioning properly: o Keyboard o Power supply o System board o Display controller board o Memory expansion boards o Memory o Diskette drives o Fixed disk - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 16
of the COMPAQ DIAGNOSTICS diskette into Drive A (Drive Position 1), and push in on the drive button. 8. Turn on the computer. See the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for detailed information on problem isolation. Chapter 3.3 Problem Isolation Flowchart The problem isolation flowchart - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 17
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Chapter 4. Setup and Inspect Chapter 4.0 Introduction Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on SETUP and INSPECT. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 21
Chapter 5. Diagnostics Program Chapter 5.0 Introduction Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on DIAGNOSTICS. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 22
Test error messages, DIAGNOSTIC error codes, and memory error codes. The SETUP. Not Set or date 164 - Memory Size 2 Short System Check memory configuration Error configuration and run SETUP. incorrect XX000YY ZZ - 201 None RAM failure Refer to Section 6.4, Memory Error "Memory - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 23
Fixed disk drive/ Run DIAGNOSTICS. Failure format error 1782 - Disk None Fixed disk drive Run DIAGNOSTICS. Controller Failure controller error 1790 - Disk 0 None Fixed disk drive 1. Run SETUP. Failure 2. Run DIAGNOSTICS. Parity Check 2 None Expansion RAM Run DIAGNOSTICS - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 24
DIAGNOSTICS Program no longer detects an error condition. The error codes are in the form of AYY - XX or AAYY - XX. A or AA represents the faulty subassembly. YY denotes the test or action that failed. XX denotes a specific problem. For example, error code 603 - 07 indicates that the diskette drive - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 25
no coprocessor present 102 - 15 Coprocessor is inoperative or socket is unoccupied Error Code Error Description Recommended Action 103 - 01 Direct memory access page Replace the system board and registers test failed retest for error codes 103 - 01 through 113 - 01. 103 - 02 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 26
. 105 - 14 NMI not triggered by fail safe timer. 106 - 01 Keyboard controller self test failed. 107 - 01 CMOS RAM test failed. 108 - 02 CMOS interrupt test failed. 108 - 03 CMOS interrupt test, CMOS not properly initialized. Error Code Error Description Recommended Action 109 - 01 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 27
3. Check switch settings. 4. Run SETUP. 5. Replace system board and retest. Table 6-3. Memory Error Codes (2xx - xx Range) - 03 RAM/ROM protect test failed. retest. 203 - 01 Memory write/read test failed Replace the appropriate memory test failed. module(s) or memory board and - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 28
204 - 05 Page hit address test failed. Replace the appropriate memory module(s) or memory board and 205 - 01 Walking I/O test failed. retest for failed. 1. Check the keyboard connector. If disconnected, turn off the computer and connect the keyboard. 2. Replace the keyboard and retest. 3. Replace - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 29
command byte restore test failed. 303 - 09 Keyboard LED test, LEDs failed to light. 1. Check the keyboard connector. If disconnected, turn off the computer and connect the keyboard. 2. Replace the keyboard and retest. 3. Replace the system board and retest. 304 - 01 Keyboard repeat key test failed - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 30
Error Description Recommended Action 501 - 01 Video controller test failed. The following steps apply to error codes 501 - 01 through 516 - 01: 502 - 01 Video memory test failed. 1. Replace the video display 503 - 01 Video attribute test failed. controller board and retest. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 31
Error Code Error Description Recommended Action 600 - xx Diskette Drive ID Test The following steps apply to error codes 600 - xx through 699 - 00: 600 - 05 Failed to reset controller 1. Replace the diskette and retest. 600 - 20 Failed to get drive type 2. Check the jumper settings on - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 32
controller 601 - 09 Failed to format a track 601 - 23 Failed to set drive type in ID media 602 - xx Diskette Read Test the system board and retest 604 - 02 Exceeded maximum hard error limit 604 - 03 Previously exceeded soft error limit 604 - 04 Previously exceeded hard error limit 604 - 05 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 33
Media Test 605 - 20 Failed to get drive type 605 - 24 Failed to read diskette media 605 - 25 Failed to verify Drive/media ID error; rerun SETUP Table 6-8. Monochrome Video Board Error Codes (8xx - xx Range) Error Code Error Description Recommended Action 802 - 01 Video memory - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 34
. 1101 - 10 COM1 set to interrupt 3. 1101 - 11 COM2 set to interrupt 4. 1101 - 12 Drive/receiver control signal failed. 1101 - 13 UART control signal interrupt failed. 1101 - 14 Drive/receiver data failed. Error Code Error Description Recommended Action 1109 - 01 Clock register The - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 35
. Error Code Error Description Recommended Action 1201 - 14 DRIVER/RECEIVER data failed. The following steps apply to error codes retest. 1202 - 01 Modem timed out waiting for 4. Replace the 32 bit memory/modem SYNC. interface board and retest. 5. Replace the system board and 1202 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 36
the system board (see Chapter 9, 1204 - 02 Modem timed out waiting for "Jumper and Switch Settings"). response. 2. Check the modem connection to the 32 bit memory/modem 1204 - 03 Modem exceeded data block interface board. retry limit. 3. Replace the modem and retest. 4. Replace the 32 bit - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 37
1206 - 17 Tone detection failed. interface board. 3. Replace the modem and retest. 1210 - xx Modem Direct Connect Test 4. Replace the 32 bit memory/modem interface board and retest. 1210 - 01 Modem timed out waiting for 5. Replace the system board and SYNC. retest. 1210 - 02 Modem timed - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 38
Chapter 9, "Jumper and Switch 1700 - 41 Failed to ID fixed disk drive Settings"). (drive not ready). 2. Replace the fixed disk drive signal and power cables and 1700 - 42 Recalibrate fixed disk drive retest. failed. 3. Replace the fixed disk drive and retest. 1700 - 45 Failed to get fixed - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 39
sector buffer. 1701 - 66 Failed to initialize fixed disk drive parameter. and retest. 4. Replace the system board and retest. 1702 - xx Fixed Disk Drive Read Test 1702 - 01 Exceeded maximum soft error limit. 1702 - 02 Exceeded maximum hard error limit. 1702 - 03 Previously exceeded maximum soft - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 40
1704 - xx Fixed Disk Drive Random Seek 4. Replace the system board and Test. retest. 1704 - 01 Exceeded maximum soft error limit. 1704 - 02 Exceeded maximum hard error limit. 1704 - 03 Previously exceeded maximum soft error limit. 1704 - 04 Previously exceeded maximum hard error limit. 1704 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 41
reset controller. 1705 - 44 Failed fixed disk drive controller diagnostics. 1705 - 56 Failed controller RAM diagnostics. 1705 - 57 Failed controller to drive diagnostics. Error Code Error Description Recommended Action 1706 - xx Fixed Disk Drive Ready Test The following steps apply - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 42
signal and power cables and retest. 3. Replace the fixed disk drive and retest. 4. Replace the system board and retest. 1714 - 01 Exceeded maximum soft error limit. 1714 - 02 Exceeded maximum hard error limit. 1714 - 03 Previously exceeded maximum soft error limit. 1714 - 04 Previously exceeded - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 43
type. retest. 3. Replace the fixed disk drive 1714 - 24 Failed to read diskette media. and retest. 4. Replace the system board and 1714 - 25 Failed to verify diskette retest. media. 1714 - 40 Cylinder 0 error. 1714 - 48 Failed to move disk table to RAM. 1714 - 49 Failed to read diskette - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 44
Code Error Description Recommended Action 1716 - xx Fixed Disk Drive Conditional The following steps apply to error Format Test codes 1700 - xx through 1717 - 73: 1716 - 01 Exceeded maximum soft error limit. 1716 - 02 Exceeded maximum hard error limit. 1716 - 05 Failed to reset controller - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 45
06 Fatal error while reading (BIOS st.>=0x20). 1717 - 07 Fatal error while writing. 1717 - 08 Failed compare of write/read buffers. 1. Check the system board jumper settings and retest (see Chapter 9, "Jumper and Switch Settings"). 2. Replace the fixed disk drive signal and power cables and retest - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 46
- 22 Never got to end of tape after servo check. 1. Replace the tape cartridge and retest. 2. Replace the tape drive expansion unit and retest. 3. Replace the system board and retest. 1901 - 25 Unable to erase cartridge. 1901 - 27 Drive not compatible with controller. 1902 - xx Tape Format Test - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 47
1991 - xx: 1904 - xx Tape Beginning of Tape/End of Tape Test 1. Replace the tape cartridge and retest. 1904 - 01 Drive not installed. 2. Replace the tape drive expansion unit and retest. 1904 - 02 Cartridge not installed. 3. Replace the system board and retest. 1904 - 03 Tape motion error - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 48
limit exceeded. 3. Replace the system board and retest. 1905 - 18 Hard error limit exceeded. 1905 - 19 Write (probably ID error). 1905 - 27 Drive not compatible with controller. 1906 - xx Tape Write, Read, Compare Test 1906 - 01 Drive not installed. 1906 - 02 Cartridge not installed. 1906 - 03 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 49
. 1906 - 26 Cannot ID drive. 1906 - 27 Drive not compatible with controller. 1991 - 12 Tape has not been servo written. Table 6-13. COMPAQ Video Graphics Error Codes (24xx - xx Range) Error Code Error Description Recommended Action 2402 - 01 Video Memory Test The following steps - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 50
Description Recommended Action 2418 - 01 VGC memory test failed. The following steps apply to 2425 - xx. 2418 - 02 VGC and ECG shadow RAM test failed. 1. Verify the switch settings. 2. Replace graphics mode test failed. Table 6-14. COMPAQ Dual Mode Plasma Display Error Codes (51xx - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 51
01 Video 40 x 25 Mode Test 5108 - memory errors are detected. o The problem may be due to a failure in the memory support circuitry, not the memory. The memory error code points to a specific memory address. The physical location of the memory address depends on the memory expansion board or memory - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 52
design of the COMPAQ PORTABLE 386 Personal Computer, the remaining codes in the format are not required for determining memory locations. The 8 digit code is defined as follows: XX 000 Y ZZ Failed data bit. Values are: || | | 00, 01, 02, 04, 08, 10, 20, 40, 80, ??. || | | || | | Failed - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 53
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Corporation. Tables 7-1 through 7-4 contain a third column that provides reference numbers keyed to specific illustrations. Table 7-5 lists spare parts for the various options available for the COMPAQ PORTABLE 386 Personal Computer. Tables 7-6 and 7-7 list parts that are available only in a kit, and - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 56
Table 7-1. Display Enclosure Assembly Item Description Part Number 1. COMPAQ Dual Mode Plasma Display 107381-001 2. Display Filter Assembly 107689-001 3. Display Enclosure 107043-001 4. Keyboard Connector Cover * 107120-001 5. Brightness Control Assembly 107384-001 6. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 57
Enhanced Keyboard Assembly Table 7-2 lists the keyboard assembly for the COMPAQ PORTABLE 386 Personal Computer, which is illustrated in Figure 7-3. Table 7-2. Portable Enhanced Keyboard Assembly Item Description Part Number 1. Keyboard Assembly - Domestic 107672-001 2. Keyboard - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 58
Table 7-3 lists the spare parts for the COMPAQ PORTABLE 386 Personal Computer chassis rear assembly. Items numbered 1 through 14 are illustrated in Figure 7-4, and items numbered 15 through 34 are illustrated in Figure 7-5. Table 7-3. Chassis - Rear Assembly - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 59
. 2400 Baud Modem Bezel * 107387-001 24. COMPAQ 1200 Baud Internal Modem 107376-001 25. 1200 Baud Modem Bezel * 107387-001 26. Plasma Display Controller Board 107787-001 27. Display Controller Data Cable ** 107382-001 28. 4 Megabyte Memory Extension Board 107685-001 29. 4 Megabyte - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 60
31. 1 to 2 Megabyte Memory Expansion Board 107686-001 32. Display Data Cable Assembly ** 107382-001 the COMPAQ PORTABLE 386 Personal Computer chassis side assembly, which is illustrated in Figure 7-6. Table 7-4. Chassis - Side Assembly Item Description Part Number 1. Drive Bezel - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 61
-001 12. Drive Cover 107480-001 * Included in the Miscellaneous Hardware Kit (PN 107386-001). ** Included in the Cable Kit (PN 107382-001). Chapter 7.6 Spare Parts for Options Table 7-5 lists spare parts for the options available for the COMPAQ PORTABLE 386 Personal Computer and their - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 62
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Table 7-5. Spare Parts for Options Description Part Number 32 Bit Memory/Modem Interface Board 107684-001 1 to 2 Megabyte Memory Expansion Board 107686-001 512 Kbyte Memory Module 107687-001 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 67
115838-001 Power Supply 108065-001 Power Cord 101155-001 300 Megabyte Fixed Disk Drive 113219-001 Signal Cable (34 position) 115812-001 * Signal Cable (20 position) 115812-001 * Universal Drive Power Cable 101137-001 Expansion Unit Cover and Bezel United States International 115804 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 68
the COMPAQ PORTABLE 386 and COMPAQ PORTABLE III Personal Computers. Table 7-6. Cable Kit Description Quantity Diskette Drive Data Cable 1 Diskette Drive Power Cable 1 Fixed Disk Drive Data Cable (COMPAQ PORTABLE III) 1 Fixed Disk Drive Power Cable (COMPAQ PORTABLE III) 1 Display - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 69
with the various part numbers and locations. After completing all removal and replacement procedures, run the DIAGNOSTICS Program on the COMPAQ PORTABLE 386 Personal Computer to verify the proper operation of the replaced component. Chapter 8.2 Preparation Procedure Before beginning the procedures - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 70
Section 8.2). 2. Detach the keyboard from the system unit. 3. Grasp the keyboard cord near where it connects to the computer. Gently pull it away from the keyboard connector on the computer (Figure 8-2). 4. Slide the keyboard connector cover off of the keyboard cord and set it aside (Figure 8-3). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 71
side down on a level surface with the rear panel facing upward. 3. Remove the six screws and washers that secure the rear panel to the computer (Figure 8-4). Note that the two screws you removed from the center position are shorter than the other four screws. 4. Carefully pull the rear panel - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 72
installed in the options compartment. This cover must be removed before either modem, the second serial interface board, or any of the memory expansion boards can be installed. To remove the interface connector cover: 1. Complete the preparation procedure (see Section 8.2). 2. Remove the rear panel - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 73
aside (Figure 8-6). To replace the interface connector cover, reverse steps 1 through 5. Chapter 8.6 Microprocessor Cover To remove the microprocessor cover: 1. Complete the preparation procedure (see Section 8.2). 2. Remove the rear panel (see Section 8.4). 3. Locate the microprocessor cover shown - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 74
4. Grasp the microprocessor cover at its edges; gently lift it up and away from the system board and set it aside (Figure 8-8). To replace the microprocessor cover, reverse steps 1 through 4. NOTE: Position the cover so that the edges slanted in go inside the fence and those slanted out go outside - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 75
interface connector cover, if installed (see Section 8.5). 4. Remove the 32 bit memory/modem interface board, if installed (see Section 8.8). 5. Remove the microprocessor cover cover up and away from the computer and set it aside (Figure 8-10). To replace the system board cover, reverse steps 1 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 76
to the system board. If one or a combination of these options is installed, the 32 bit memory/modem interface board will also be in place. To remove the 32 bit memory/modem interface board: 1. Complete the preparation procedure (see Section 8.2). 2. Remove the rear panel (see Section 8.4). 3. Locate - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 77
/modem interface board and set them aside. 5. Grasp the 32 bit memory/modem interface board at its edges and, without rocking it, lift it straight up and away from the computer (Figure 8-12). When the 32 bit memory/modem interface board is removed, the options compartment with its two expansion - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 78
Baud Internal Modem, are approved for use with the COMPAQ PORTABLE 386 Personal Computer. The second slot allows memory expansion using any of three different memory expansion board combinations (see Section 8.8). To replace the 32 bit memory/modem interface board, reverse steps 1 through 4. Chapter - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 79
5. Locate the internal modem and modem ground bracket shown in Figure 8-15. 6. Remove the one screw that secures the modem ground bracket to the system board (Figure 8-16). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 80
7. Remove the modem bezel (Figure 8-17). 8. Slide the internal modem out of the options compartment and set it aside (Figure 8-18). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 81
the second serial interface board: 1. Complete the preparation procedure (see Section 8.2). 2. Remove the rear panel (see Section 8.4). 3. Remove the 32 bit memory/modem interface board (see Section 8.8). 4. Press the top tab and disconnect the LED/speaker and keyboard cables from the system board - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 82
5. Locate the second serial interface board shown in Figure 8-20. 6. Slide the second serial interface board out of the options compartment and set it aside (Figure 8-21). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 83
boards are available for the COMPAQ PORTABLE 386 Personal Computer: o 1 to 2 Megabyte Memory Expansion Board, which comes standard with four sockets and one megabyte of random access memory (RAM). The one megabyte of RAM is in the form of a memory upgrade kit (two 512 Kbyte memory modules), which is - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 84
expansion board: 1. Complete the preparation procedure (see Section 8.2). 2. Remove the rear panel (see Section 8.4). 3. Remove the 32 bit memory/modem interface board (see Section 8.8). 4. Press the top tab and disconnect the LED/speaker and keyboard cables from the system board (Figure 8-22). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 85
5. Locate the memory expansion board shown in Figure 8-23. 6. Slide the memory expansion board out of the options compartment and set it aside (Figure 8-24). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 86
board, reverse steps 1 through 6. Chapter 8.12 Memory Upgrade Kit Each 1 megabyte memory upgrade kit consists of two 512 Kbyte memory modules, which are surface mounted with four 256K x 4, 80 ns RAM chips and two 256K x 1, 80 ns RAM chips. The memory upgrade kits are used on the system board to - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 87
one end of the module. 6. Grasp the end of the module, pull up, and "peel" it away from its socket (Figure 8-26). To replace the memory module, simply reinsert it into its socket, then reverse steps 1 through 3. To remove - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 88
(see Section 8.2). 2. Remove the rear panel (see Section 8.4). 3. Remove the 32 bit memory/modem interface board (see Section 8.8). 4. Remove the 1 to 2 megabyte memory expansion board (see Section 8.11). 5. Locate the memory module that is to be replaced (Figure 8-27). 6. To release the module - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 89
the interface connector cover, if installed (see Section 8.5). 4. Remove the microprocessor cover (see Section 8.6). 5. Remove the system board cover (see Section 8.7). 6. Remove the 32 bit memory/modem interface board, if installed (see Section 8.8). 7. Locate the system ROM shown in Figure 8-29. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 90
8. Using an IC removal tool, remove the system ROM (Figure 8-30). 9. Using an IC insertion tool, insert the new ROM into the appropriate sockets (Figure 8-31). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 91
cover, if installed (see Section 8.5). 4. Remove the 32 bit memory/modem interface board, if installed (see Section 8.8). 5. Remove the second serial interface board, if installed (see Section 8.10). 9. Remove the memory expansion board, if installed (see Section 8.11). 10. Disconnect the following - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 92
o Fixed disk drive power cable o LED/speaker cable o Keyboard cable o Display controller board data cable o Battery cable 11. Remove the screws that secure the system board assembly to the main enclosure (Figure 8-33). NOTE: Use a 3/16 inch wrench to remove the - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 93
12. Grasp the system board assembly by its edges. Lift it up and away from the main enclosure. 13. Disconnect the RGBI cable assembly from the plasma display controller board (Figure 8-34). To replace the system board, reverse steps 1 through 13. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 94
7. Remove the internal modem, if installed (see Section 8.9). 8. Remove the second serial interface board, if installed (see Section 8.10). 9. Remove the memory expansion board, if installed (see Section 8.11). 10. Remove the system board (see Section 8.14). 11. Locate the controller board shown in - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 95
NOTE: Removing the controller board from its compartment also disconnects it from the display data cable. 13. Disconnect the display controller board data cable from the controller board (Figure 8-37). To replace the controller board, reverse steps 1 through 13. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 96
of the drive bezel. 4. Pull the drive bezel away from the computer with your thumb. (Figure 8-38). 5. Disconnect the following cables (shown in Figure 8-39) from the system board: o Diskette drive data cable o Diskette drive power cable o Fixed disk drive data cable o Fixed disk drive power cable - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 97
6. Locate the mass storage device subassembly shown in Figure 8-40. 7. Remove the screw that secures the mass storage device subassembly to the mass storage device enclosure (Figure 8-41). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 98
8. Slide the mass storage device subassembly out of the mass storage device enclosure (Figure 8-42). CAUTION When removing the mass storage device subassembly, be sure that the cables do not interfere with the mass storage device enclosure - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 99
step 5, to the system board. To replace the bezel and rear panel, reverse steps 1 through 4. Chapter 8.17 Fixed Disk Drive To remove the fixed disk drive assembly: 1. Complete the preparation procedure (see Section 8.2). 2. Remove the rear panel (see Section 8.4). 3. Remove the mass storage device - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 100
6. Remove the two screws that secure the drive cover or metal plate covering the front of Drive Position 2 (Figure 8-45). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 101
7. Remove the four screws from the mass storage device subassembly and slide the fixed disk drive assembly out of the mass storage device subassembly (Figure 8-46). To replace the fixed disk drive, reverse steps 1 through 7. Chapter 8.18 Diskette Drive - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 102
: 1. Complete the preparation procedure (see Section 8.2). 2. Remove the rear panel (see Section 8.4). 3. Remove the mass storage device subassembly (see Section 8.12). 4. Locate the diskette drive shown in Figure 8-47. 5. Disconnect the diskette drive power and signal cables from the diskette - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 103
6. Remove the four shoulder bolts from the mass storage device subassembly and slide the diskette drive assembly out of the mass storage device subassembly (Figure 8-49). NOTE: When removing the diskette drive, do not misplace the four vibration isolators shown in Figure 8-49. You must use all four - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 104
2. Remove the rear panel (see Section 8.4). 3. Remove the interface connector cover, if installed (see Section 8.5). 4. Remove the 32 bit memory/modem interface board, if installed (see Section 8.8). 5. Remove the system board cover (see Section 8.6). 6. Remove the microprocessor cover (see Section - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 105
10. Disconnect the plasma display data cable and the plasma display power cable ground wire from the power supply (Figure 8-52). 11. Place the computer in an upright position. 12. Place the plasma display at an outward angle and remove the top two screws and washers with an angle Torx - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 106
13. Lift the plasma display into an upright position and remove the bottom two screws and washers with a Torx screw driver (Figure 8-54). 14. Carefully slide the power supply out of the computer chassis (Figure 8-55). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 107
1 through 14. Chapter 8.20 Mass Storage Device Enclosure To installed (see Section 8.5). 4. Remove the 32 bit memory/modem interface board, if installed (see Section 8.8). storage device subassembly (see Section 8.16). 7. Place the computer in an upright position. 8. Place the plasma display at - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 108
9. Lift the plasma display into an upright position and remove the bottom two screws and washers from the mass storage device enclosure with a Torx screwdriver (Figure 8-57). 10. Carefully slide the mass storage device enclosure out of the computer chassis (Figure 8-58). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 109
8.2). 2. Remove the rear panel (see Section 8.4). 3. Remove the interface connector cover, if installed (see Section 8.5). 4. Remove the 32 bit memory/modem interface board, if installed (see Section 8.8). 5. Remove the system board (see Section 8.14). 6. Remove the mass storage device subassembly - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 110
9. Remove the two screws that secure the keyboard cable connector to the keyboard ground strap and computer chassis (Figure 8-60). 10. Locate the LED/speaker and keyboard cables shown in Figure 8-61. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 111
11. Disconnect the LED connector from the LED assembly (Figure 8-62). Be careful not to bend the pins on the LED assembly connector. 12. Disconnect the speaker from the rail (Figure 8-63 - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 112
CAUTION When removing the speaker, do not touch the silver speaker surface 13. Slide the speaker and the LED connector through the slot in the options compartment (Figure 8-64). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 113
14. Disconnect the keyboard cable extension from the keyboard cable. 15. Remove the LED/speaker cable and keyboard cable from the options compartment (Figure 8-65). 16. Remove the eight screws that secure the front main bezel to the main housing enclosure (Figure 8-66). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 114
17. Push the LED assembly forward and snap it out (Figure 8-67). 18. Slide the LED lens out of the computer chassis (Figure 8-68). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 115
To replace the LED assembly and the LED/speaker and keyboard cables, reverse steps 1 through 17 CAUTION When replacing the speaker, do not touch the silver speaker surface Chapter 8.22 Plasma Display To remove the Plasma Display: 1. Complete the preparation procedure (see Section 8.2). 2. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 116
3. While holding the display bezel in place with one hand, remove the four screws that secure the display bezel to the display enclosure. These screws are located on the back of the display enclosure (Figure 8-70). 4. Alter removing the four screws, lift the display bezel away from the front of the - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 117
CAUTION Grasp the display by its metal frame and do not touch the display panel 5. Remove the two latches from the display enclosure and set them aside (Figure 8-72). NOTE: For future replacement, notice how the latches are positioned. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 118
6. Locate the plasma display shown in Figure 8-73. 7. Remove the four screws and washers that secure the plasma display to the display enclosure (Figure 8-74). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 119
NOTE: The ground plate comes loose and may hang from the ground wires when the plasma display is removed. 8. Lift the plasma display away from the display ground bracket and tilt it forward to expose the cables. 9. Disconnect the ground plate from the ground wires and remove the grounding foil. 10. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 120
11. Disconnect the display power cable ground wires from the plasma display (Figure 8-76). To replace the plasma display, reverse steps 1 through 11. As you replace the display bezel, replace the brightness control knob. NOTE: If cleaning is required, use isopropyl alcohol. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 121
Chapter 8.23 Plasma Display Filter To remove the plasma display filter: 1. Complete the preparation procedure (see Section 8.2). 2. Complete steps 2 through 4 of Section 8.22. 3. Remove the filter by lifting it up and out of the plasma display enclosure as shown in Figure 8-77. To replace the plasma - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 122
4. Push the lower legs of the brightness control assembly upward, and snap the assembly out (Figure 8-79). To replace the brightness control assembly, reverse steps 1 through 4. Chapter 8.25 Display Enclosure To remove the display enclosure: - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 123
1. Complete the preparation procedure (see Section 8.2). 2. Remove the plasma display (see Section 8.22). 3. Remove the two screws that secure the strain relief clip to the display enclosure (Figure 8-80). 4. Remove the display power cable and the display data cable from the strain relief clip ( - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 124
5. Observe that the display enclosure is attached to the main enclosure by two mandrels and two plasma display hinges (Figure 8-82). 6. Remove the one screw that secures each mandrel to the display enclosure (Figure 8-83). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 125
7. Remove each mandrel from the display enclosure by pushing the mandrel toward the plasma display and lifting it out (Figure 8-84). 8. Remove the four screws that secure the display enclosure to the plasma display hinges (Figure 8-85). NOTE: Removing the two screws from the left side of the display - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 126
the display enclosure) will also remove the display ground (Figure 8-85). 9. Lift the display enclosure away from the main enclosure, being careful to guide the display power cable and display data cable through the slot in the display enclosure (Figure 8-86). 10. Notice that the rollers are still - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 127
the display cable assembly back through the slot in the main enclosure. 2. With the display enclosure in the down position, guide each roller and mandrel back into position and replace the screw. 3. While aligning the display enclosure with the plasma display hinges with one hand, replace - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 128
2. Remove the rear panel (see Section 8.4). 3. Remove the 32 bit memory/modem interface board, if installed (see Section 8.5). 4. Remove the system board (see Section 8.18). 7. Remove the display enclosure (see Section 8.20) 8. Locate the display power cable assembly and the display data cable - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 129
10. Disconnect the display data cable and display power cable ground wires from the power supply (Figure 8-90). 11. Remove the screw that secures the strain relief bracket to the main enclosure (Figure 8-91). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 130
12. Remove the display data cable connector from the plasma display controller board compartment (Figure 8-92). 13. Guide the display power cable assembly and the display data cable assembly through the opening in the main enclosure wall (Figure 8-93). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 131
connector cover, if installed (see Section 8.5). 4. Remove the 32 bit memory/modem interface board, if installed (see Section 8.8). 5. Remove the system see Section 8.16). 7. Remove the mass storage device enclosure (see Section 8.20). NOTE: The handle can be removed at this point. To remove the - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 132
10. Remove the four screws that secure the plasma display hinges to the main enclosure (Figure 8-95). 11. Locate the handle and spreader plate shown in Figure 8-96. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 133
12. Remove the two screws that secure the handle and spreader plate to the computer chassis. Remove the handle and spreader plate (Figure 8-97). To replace the handle and spreader plate, reverse steps 1 through 12. Chapter 8.28 Battery - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 134
, or dispose of in fire. Use only replacement batteries supplied by Compaq Computer Corporation (PN 107786-001) Disposal of the lithium battery should be accomplished within compliance of local regulations or returned to Compaq Computer Corporation by established parts return methods To remove the - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 135
1 through 7 WARNING Use caution when replacing the lithium battery. Be sure the replacement battery is supplied by Compaq Computer Corporation and identified by PN 107786-001 NOTE: UPS will not airship (UPS blue label) lithium batteries. Chapter 8.29 Expansion Unit To remove the expansion unit - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 136
3. Place the computer, keyboard side down, on a level surface with the rear panel facing up and the handle facing away from you. 4. Pull out on the locking bar that secures the expansion unit to the computer chassis (Figure 8-101). 5. Grasp the expansion unit on each side. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 137
6. Pull the expansion unit up and away from the computer (Figure 8-102). 7. Insert a flat blade screwdriver in each of the four notches on the expansion unit and gently pop up the expansion unit cover (Figure 8-103). 8. Remove the expansion unit cover (Figure 8-104). - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 138
and out of its connector on the circuit board (Figure 8-105). To replace the expansion unit, reverse steps 1 through 9. Chapter 8.30 300/600 Megabyte Fixed Disk Drive Expansion Unit - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 139
hereafter referred to as the fixed disk drive expansion unit). 3. Disconnect all power to the computer and the fixed disk drive expansion unit. 4. Disconnect the signal cable from the fixed disk drive expansion unit to the computer. 5. Place the fixed disk drive expansion unit on a flat surface with - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 140
2. Disconnect the 20 pin and 34 pin signal cables from the external interface adapter board in the fixed disk drive expansion unit (Figure 8-107). 3. Disconnect the universal drive power cable from the external interface adapter board in the fixed disk drive expansion unit (Figure 8-108). 4. Remove - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 141
terminating resistor must be installed on a 300 megabyte fixed disk drive if: o The fixed disk drive is in a 300 Megabyte Fixed Disk Drive Expansion Unit. o The fixed disk drive is the secondary drive in a 600 Megabyte Fixed Disk Drive Expansion Unit. To remove the terminating resistor, complete the - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 142
resistors are located in different positions on the drive depending on the manufacturer. To replace the fixed disk drive in the fixed disk drive expansion unit, reverse steps 1 through 5. Power Supply To remove the power supply from the fixed disk drive expansion unit, complete the following steps - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 143
3. Slide the power supply assembly 1/2 inch to 1 inch (1.27 to 2.54 cm) toward the fixed disk drive housing (Figure 8-112). Be sure to clear the tabs on the bottom chassis. These tabs hold the power supply assembly in place. 4. Shift the power - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 144
the power supply assembly, reverse steps 1 through 5. External Interface Adapter Board To remove the external interface adapter board from the fixed disk drive expansion unit, complete the following steps: 1. Complete the preparation procedures at the beginning of Section 8.30. 2. Disconnect the - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 145
3. Disconnect the universal drive power and power supply cables from the external interface adapter board (Figure 8-114). 4. Remove the external interface adapter board. NOTE: Inspect the new external interface adapter board for shipping damage before installing. - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 146
To replace the external interface adapter board, reverse steps 1 through 4. NOTE: For internal and external switch settings for the 300/600 Megabyte Fixed Disk Drive Expansion Unit, refer to Chapter 9, "Jumper and Switch Settings." - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 147
a COMPAQ PORTABLE 386 Personal Computer, the SETUP program must be run to change the system configuration information stored in CMOS memory. (serial) interface options. o E5 and E6 enable or disable the fixed disk drive and indicate whether the primary or secondary I/O address is used. o E13, - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 148
on the COMPAQ PORTABLE 386 system board. Chapter 9.3 System Board Jumper Settings Refer to Figure 9-1 for the system board jumper locations. Use Tables 9-1 through 9-9 as references for setting each jumper. NOTE: Refer to the configuration label, located on the inside of the computers rear panel - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 149
E7, Pins 1 and 2 Select primary interrupt (IRQ7) (default) E7, Pins 2 and 3 Select alternate interrupt (IRQ5) Table 9-2. Jumpers E3, E4, E8, and E9 - Select Serial Communications Interface Options Jumper Setting Function E3, Pins 2 and 3 Select serial interface as COM1 (3FX, - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 150
Enables fixed disk drive (default). E5, Pins 2 and 3 Disables fixed disk drive. E6, Pins 2 and 3 Selects primary drive addresses (1FX, 3FX) (default). E6, Pins 1 and 2 Selects secondary drive addresses (17X, 37X) Table 9-4. Jumpers E13 and E14 - Select Amount of 32 Bit Memory to be Used - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 151
board in the computer. This configuration switch bank also selects the power on mode and character format of the COMPAQ Enhanced Color Graphics Board when the computer is turned on or restarted. The following sections provide jumper and configuration switch locations and instructions on how to - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 152
Enhanced Color Graphics Board. Be sure that you set them correctly for your computer system before installing the board. NOTE: When using a COMPAQ Enhanced Color Graphics Board with a COMPAQ PORTABLE 386 Personal Computer, you must: 1. Use MODE.COM Version 3.2 or later. Type MODE at the DOS - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 153
as the Primary/Only Display Controller Board Switch Settings SW1 Power On Mode Allowable Switches Secondary Monitor Type (Character Format) 1 2 3 4 Board Type COMPAQ Color Monitor 80 x 25 OFF ON ON OFF Monochrome or Compatible Enhanced (640 x 350 Display Color Monitor or - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 154
ON Monochrome or Compatible Enhanced (320 x 200 Display Color Monitor or COMPAQ resolution) Adapter Dual Mode Monitor or 80 x 25 RGB Color Monitor COMPAQ Dual Mode 80 x 25 OFF OFF ON OFF COMPAQ Monitor (720 x 350 Video resolution) Display Controller or Color Graphics Adapter - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 155
350 Video resolution) Display Controller or Color Graphics Adapter 80 x 25 COMPAQ Dual Mode 80 x 25 ON ON OFF ON COMPAQ Monitor (720 x 350 Video resolution Display Controller or Color Graphics Adapter 40 x 25 Configuration Switch Bank SW2 The monitor type used with the - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 156
Dual Mode Monitor or an RGB color monitor. Table 9-14. Jumper JP3 - Selects RGB or COMPAQ Dual Mode Monitor Jumper Setting Function JP3, Pins 1 and 2 Selects COMPAQ Dual Mode Monitor (3xxh) (default). JP3, Pins 2 and 3 Selects RGB color monitor. (2xxh) Chapter 9.5 Serial - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 157
and Table 9-16 lists approximate jumper settings. Table 9-16. Video Graphics Controller Board Jumper Settings (Assy No. 109360) Jumper Function J1 Video RAM 1-2 16 bit (default) 2-3 8 bit J2 Video ROM 2-3 8 bit (default) 1-2 16 bit (Assy No. 000806) Jumper Function - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 158
J1 Video RAM 1-2 8 bit 2-3 16 bit (default) J2 Video ROM 1-2 8 bit (default) 2-3 16 bit - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 159
Board are listed in Table 9-17. The board is shown in Figure 9-7. Table 9-17. 1:1 Interleave Buffered ESDI External Fixed Disk Drive Controller Board (Assy No. 001091) Switch Setting Status Function 1 ON Secondary Address Selects controller address. 2 OFF (default) Primary - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 160
Chapter 10.1 Introduction The 300/600 Megabyte Fixed Disk Drive Expansion Unit (hereafter referred to as the fixed disk drive expansion unit) can be used with the COMPAQ PORTABLE 386 Personal Computer with system ROM revision K.0P or later. The fixed disk drive expansion unit can be used as a normal - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 161
operation of the mirroring function. A possible mirroring configuration currently supported by Compaq Computer Corporation uses one fixed disk drive expansion unit with two 300 megabyte fixed disk drives. A single external fixed disk drive controller, plugged into the system bus and connected with - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 162
up the system for the duplexing function to work. Compaq Computer Corporation also supports duplexing configuration using two fixed disk drive expansion units, each equipped with two 300 megabyte fixed disk drives. The two 300 megabyte fixed disk drives in each unit connect to a single external - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 163
After modifying the CONFIG.SYS file, restart the computer to load the EXTDISK.SYS device driver in memory. The FDISK Utility You must install the EXTDISK.SYS device driver in the CONFIG.SYS file before you can use FDISK with the fixed disk drive expansion unit. For information about FDISK, refer to - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 164
if a fixed disk drive fails. Disk mirroring requires a single fixed disk drive controller and two identical fixed disk drives. The Novell ATDISK driver supports SFT II (disk mirroring) for a single disk controller system. The COMPAQ CPQDSK and NVCPQDSK drivers support SFT II (disk mirroring) for - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 165
devices. 2. Install the external fixed disk drive controller board. 3. Run the SETUP program to initialize the CMOS memory to reflect the number and type of fixed disk drives currently installed. 4. Insert the EXTDISK diskette into drive A and restart the computer. 5. Copy the files with .DSK - Compaq Portable 386 | Compaq Portable 386 Personal Computer Maintenance and Serv - Page 166
EXTDISK diskette: HCDCMPSF.BAT HCDCMPSF.DOC NOTE: When installing NetWare on high capacity fixed disk drives, the NETGEN program may halt and display the following message: ABEND : Not enough memory for disk FAT tables. There are two methods of installing software if this occurs: 1) by limiting
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 guide contains information protected by copyright. No part of this guide
may be photocopied or reproduced in any form without prior written consent
from Compaq Computer Corporation.
Copyright 1987, 1989 Compaq Computer Corporation.
All rights reserved. Printed in the USA.
COMPAQ, COMPAQ PORTABLE III, and COMPAQ PORTABLE 386, are trademarks of
Compaq Computer Corporation.
The software described in this guide is furnished under a license agreement
or nondisclosure agreement. The software may be used or copied only in
accordance with the terms of the agreement.
Microsoft, MS, and MS-DOS are trademarks of Microsoft Corporation.
Product names mentioned herein are for identification purposes only and may be
trademarks and/or registered trademarks of their respective companies.
COMPAQ PORTABLE 386 PERSONAL COMPUTER
MAINTENANCE AND SERVICE GUIDE
Second Edition (August 1989)
First Edition (September 1987)
Assy No. 107536-002
Binder Number 197537-001
Text Number 107538-002
Compaq Computer Corporation requires that all peripheral devices be connected
to this computer/product via shielded cables with metal RFI/EMI connector
hoods.
==============================================================================
WIRE TYPE:
Multipaired, overall shielded; Belden #98XX; Alpha #54XX;
or equivalent.
CONNECTOR HOOD:
RFI/EMI metal shield; AMP #74517X-X; or equivalent.
==============================================================================
It is important that the chassis ground strap of the peripheral device be
connected to the computer chassis. An Alpha #1221 flat braided strap is
sufficient. The strap is not necessary if a shielded cable connects the two
chassis.
COMPAQ PORTABLE 386 PERSONAL COMPUTER MAINTENANCE AND SERVICE GUIDE is a
troubleshooting guide that can be used as a reference when servicing the
COMPAQ PORTABLE 386 Personal Computer. Compaq Computer Corporation reserves