Compaq Compaq Portable II Troubleshooting Guide

Foreword NoticeThe information in this guide is subject to change without notice.COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR EDIT

Drive Type(used in SETUP program) 17 or 43Media:Number of Surfaces 4Tracks per Surface 805Number of Logical Data Heads 5Number of Logical Cylinders 98

6. Remove the two screws that secure the drive cover or metal platecovering the front of Drive Position 2 (Figure 8-45).

7. Remove the four screws from the mass storage device subassembly and slidethe fixed disk drive assembly out of the mass storage device subassembly(F

To remove the diskette drive assembly:1. Complete the preparation procedure (see Section 8.2).2. Remove the rear panel (see Section 8.4).3. Remove the

6. Remove the four shoulder bolts from the mass storage device subassemblyand slide the diskette drive assembly out of the mass storage devicesubassem

Chapter 8.19 Power Supply To remove the power supply:1. Complete the preparation procedure (see Section 8.2).2. Remove the rear panel (see Section 8.4

10. Disconnect the plasma display data cable and the plasma display powercable ground wire from the power supply (Figure 8-52).11. Place the computer

13. Lift the plasma display into an upright position and remove the bottomtwo screws and washers with a Torx screw driver (Figure 8-54).14. Carefully

To replace the power supply, reverse steps 1 through 14.Chapter 8.20 Mass Storage Device Enclosure To remove the mass storage device enclosure:1. Comp

9. Lift the plasma display into an upright position and remove the bottomtwo screws and washers from the mass storage device enclosure with aTorx scre

To replace the mass storage device enclosure, reverse steps 1 through 10.>>>>>>>>>>>>>>>>>>>&

Table 2-9 lists the specifications for the 110 megabyte fixed disk drive.Table 2-9. 110 Megabyte Fixed Disk Drive Specifications======================

9. Remove the two screws that secure the keyboard cable connector to thekeyboard ground strap and computer chassis (Figure 8-60).10. Locate the LED/sp

11. Disconnect the LED connector from the LED assembly (Figure 8-62). Becareful not to bend the pins on the LED assembly connector.12. Disconnect the

CAUTIONWhen removing the speaker, do not touch the silver speaker surface.>>>>>>>>>>>>>>>>>>>

14. Disconnect the keyboard cable extension from the keyboard cable.15. Remove the LED/speaker cable and keyboard cable from the optionscompartment (F

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).

To replace the LED assembly and the LED/speaker and keyboard cables, reversesteps 1 through 17.>>>>>>>>>>>>>>

3. While holding the display bezel in place with one hand, remove the fourscrews that secure the display bezel to the display enclosure. Thesescrews a

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>&g

6. Locate the plasma display shown in Figure 8-73.7. Remove the four screws and washers that secure the plasma display to thedisplay enclosure (Figure

NOTE: The ground plate comes loose and may hang from the ground wires whenthe plasma display is removed.8. Lift the plasma display away from the displ

==============================================================================Dimensions:Height 3.4 in. (8.6 cm)Depth 0.7 in. (1.9 cm)Width 5.4 in. (1

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

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 thr

4. Push the lower legs of the brightness control assembly upward, and snapthe assembly out (Figure 8-79).To replace the brightness control assembly, r

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 strai

5. Observe that the display enclosure is attached to the main enclosure bytwo mandrels and two plasma display hinges (Figure 8-82).6. Remove the one s

7. Remove each mandrel from the display enclosure by pushing the mandreltoward the plasma display and lifting it out (Figure 8-84).8. Remove the four

you face the display enclosure) will also remove the display ground(Figure 8-85).9. Lift the display enclosure away from the main enclosure, being car

11. Remove the rollers from the grooves, place them on the mandrels, andset them aside.To replace the display enclosure:1. Guide the display cable ass

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,

10. Disconnect the display data cable and display power cable ground wiresfrom the power supply (Figure 8-90).11. Remove the screw that secures the st

Table 2-14. Power Supply Specifications==============================================================================Input Requirements:Line Voltage 1

12. Remove the display data cable connector from the plasma displaycontroller board compartment (Figure 8-92).13. Guide the display power cable assemb

NOTE: For future replacement, notice the proper orientation of the displaypower cable assembly and the display data cable assembly.To replace the disp

10. Remove the four screws that secure the plasma display hinges to themain enclosure (Figure 8-95).11. Locate the handle and spreader plate shown in

12. Remove the two screws that secure the handle and spreader plate to thecomputer chassis. Remove the handle and spreader plate (Figure 8-97).To repl

WARNINGThis computer contains a lithium battery that may explode if mistreated. Donot abuse, disassemble, or dispose of in fire.Use only replacement b

To replace the battery, reverse steps 1 through 7.>>>>>>>>>>>>>>>>>>>>>>>>>

3. Place the computer, keyboard side down, on a level surface with the rearpanel facing up and the handle facing away from you.4. Pull out on the lock

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 theexpansion

9. Remove the retaining screw that secures each optional expansion board tothe expansion unit. Gently lift the board(s) up and out of its connectoron

Preparation ProceduresBefore beginning the removal and replacement procedures, complete thefollowing steps.1. Turn off the computer.2. Turn off the 30

(noncondensing)Nonoperating Not less than 5% or more than 90% (noncondensing)-------------------------------------------------------------------------

2. Disconnect the 20 pin and 34 pin signal cables from the external interfaceadapter board in the fixed disk drive expansion unit (Figure 8-107).3. Di

5. Carefully slide the fixed disk drive out of the fixed disk drive expansionunit housing.NOTE: A terminating resistor must be installed on a 300 mega

NOTE: Terminating resistors are located in different positions on the drivedepending on the manufacturer.To replace the fixed disk drive in the fixed

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 thetabs on

To replace the power supply assembly, reverse steps 1 through 5.External Interface Adapter BoardTo remove the external interface adapter board from th

3. Disconnect the universal drive power and power supply cables from theexternal interface adapter board (Figure 8-114).4. Remove the external interfa

To replace the external interface adapter board, reverse steps 1 through 4.NOTE: For internal and external switch settings for the 300/600 MegabyteFix

Chapter 9. Jumper and Switch Settings Chapter 9.1 Introduction This chapter provides jumper and switch settings for the COMPAQPORTABLE 386 Personal C

NOTE: The following jumper settings are reserved:E12, Pins 1 and 2E18, Pins 2 and 3E22, Pins 2 and 3E24, Pins 1 and 2E25, Pins 1 and 2Figure 9-1 shows

E7, Pins 1 and 2 Select primary interrupt (IRQ7) (default)E7, Pins 2 and 3 Select alternate interrupt (IRQ5)==========================================

Chapter 3. Power On Self Test (POST)/Problem Isolation Chapter 3.0 Introduction This chapter lists the assemblies checked by the Power On Self Test (

Table 9-3. Jumpers E5 and E6 - Select Drive Options==============================================================================Jumper Setting Functi

------------------------------------------------------------------------------E19, Pins 1 and 2 Fail safe timer enabled (default).E19, Pins 2 and 3 Fa

CAUTIONUse care when setting the configuration switches on the COMPAQ Enhanced ColorGraphics Board. Many of the components on the board are sensitive

Configuration Switch Bank SW1How the COMPAQ Enhanced Color Graphics Board is to be used determines thesetting for configuration switch bank SW1. The b

------------------------------------------------------------------------------COMPAQ Color Monitor 80 x 25 OFF OFF OFF ON Monochromeor Compatible Enha

------------------------------------------------------------------------------COMPAQ Dual Mode 80 x 25 OFF ON OFF ON COMPAQMonitor (720 x 350 Videores

Jumper JP3Jumper JP3 is shown in both Figures 9-2 and 9-3. Table 9-14 provides thecorrect setting for Jumper JP3.Table 9-13. Jumper P1 - Selects Monit

Switch Function------------------------------------------------------------------------------1 Reserved - Always OFF----------------------------------

------------------------------------------------------------------------------J1 Video RAM1-2 8 bit2-3 16 bit (default)-------------------------------

Chapter 9.7 ESDI External Fixed Disk Drive Controller Board Switch settings for the 1:1 Interleave Buffered ESDI External Fixed Disk DriveController B

printer, remove the loopback plug from the parallel interface and connect theprinter instead.6. Reconnect the AC power cord to a well grounded AC outl

Chapter 10. Mass Storage Configurations Chapter 10.1 Introduction The 300/600 Megabyte Fixed Disk Drive Expansion Unit (hereafter referred to asthe f

To use MS-DOS and the device driver with two fixed disk drives and one fixeddisk drive expansion unit:o A maximum of two controllers can be plugged in

DuplexingIMPORTANT: Novell NetWare software must be used when setting up the systemfor the duplexing function to work.Compaq Computer Corporation also

Chapter 10.3 Setting Up the Fixed Disk Drive Expansion Unit The EXTDISK.SYS Device DriverIf you are running the fixed disk drive expansion unit at the

If the fixed disk drive expansion unit is configured at the primary address,that fixed disk drive must contain a primary DOS partition. The primarypar

one of a mirrored or duplexed pair of drives. The UNMIRROR command has noeffect on the disk driver that is in use. NetWare must be reinstalled tochang

COMP21.BAT Batch file to run patchCOMP21.DOC Documentation for patchPATCH.EXE Main patch program8. If you applied any patches, place the patched files

the right to make changes in its COMPAQ PORTABLE 386 Personal Computer withoutnotice. Accordingly, the diagrams and procedures in this document may no

Chapter 4. Setup and Inspect Chapter 4.0 Introduction Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for currentinformation on SET

Chapter 5. Diagnostics Program Chapter 5.0 Introduction Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for currentinformation on D

Chapter 6. Error Messages and Codes Chapter 6.1 Introduction This chapter provides Power On Self Test error messages, DIAGNOSTIC errorcodes, and memo

304 - Keyboard or None Keyboard or 1. Replace keyboard.System Unit Error system board 2. Replace system board.failure---------------------------------

the problem. After completing each step, run the DIAGNOSTICS Program toverify that the error condition has been corrected. If the error codereappears,

test failed and retest.102 - 11 Numeric coprocessorspeed test failed102 - 12 Numeric coprocessorpattern test failed102 - 14 Switch indicates nocoproce

105 - 12 Port 61, bit 2 not at zero.105 - 13 No interrupt generated byfail safe timer.105 - 14 NMI not triggered byfail safe timer.106 - 01 Keyboard c

112 - 08 Speed test unable to enterauto mode.112 - 09 Speed test unable to enterhigh mode.112 - 10 Speed test high mode outof range.112 - 11 Speed tes

204 - 02 Error during saving programmemory in address test.204 - 03 Error during restore ofprogram memory in address test.204 - 04 A20 address test fa

303 - 01 Keyboard LED test,8042 self test failed.303 - 02 Keyboard LED test,retest test failed.303 - 03 Keyboard LED test,retest failed.303 - 04 Keybo

Chapter 1. Introduction Chapter 1.1 Summary of Text This guide contains ten chapters which are summarized below:Chapter 1. INTRODUCTION provides a br

402 - 03 Printer data and control 3. Replace the Serial/Parallelregisters failed. Interface Board, if applicable,and retest.402 - 04 Printer loopback

2. Replace the monitor and504 - 01 Video character set test retest.failed. 3. Replace the system boardand retest.505 - 01 Video 80 x 25 mode9x14charac

the system board and retest601 - xx Format Test (see Chapter 9, "Jumper andSwitch Settings").601 - 05 Failed to reset controller 3. Check th

605 - xx Diskette ID Media Test The following steps apply to errorcodes 600 - xx through 699 - 00:605 - 20 Failed to get drive type1. Replace the disk

Code Error Description Recommended Action------------------------------------------------------------------------------1101 - xx Asynchronous Communic

ErrorCode Error Description Recommended Action------------------------------------------------------------------------------1201 - xx Modem Internal L

1203 - 01 Modem external TIP/RINGfailed.1203 - 02 Modem external DATA TIP/RINGfailed.1203 - 03 Modem line terminationfailed.--------------------------

retry limit. 5. Replace the system board andretest.1205 - 04 RCV exceeded carrier lostlimit.1205 - 05 XMIT exceeded carrier lostlimit.1205 - 06 Time o

1210 - 09 Modem exceeded maximumredial limit.1210 - 10 Line quality preventedremote connection.1210 - 11 Modem timed out waitingfor remote connection.

and retest.1701 - 59 Failed to read sector 4. Replace the system board andbuffer. retest.1701 - 66 Failed to initialize fixeddisk drive parameter.1702

o Torx Angle T-15 Screwdrivero 3/16 Inch Open End Wrencho Integrated Circuit (IC) Removal Toolo Integrated Circuit (IC) Insertion Toolo Modem Terminat

soft error limit. settings and retest(see Chapter 9, "Jumper and1703 - 04 Previously exceeded maximum Switch Settings").hard error limit. 2.

1704 - 06 Fatal error while reading.------------------------------------------------------------------------------ErrorCode Error Description Recommen

1708 - 09 Format track bad failed.1708 - 42 Recalibrate drive failed.1708 - 43 Failed to format a cylinderbad.1708 - 58 Failed to write sectorbuffer.1

1714 - 10 Failed diskette sector wrap (see Chapter 9, "Jumper andduring read. Switch Settings").2. Replace the fixed disk drive1714 - 20 Fai

ErrorCode Error Description Recommended Action------------------------------------------------------------------------------1716 - xx Fixed Disk Drive

1717 - xx Fixed Disk Drive ECC Test1717 - 01 Exceeded maximum soft errorlimit.1717 - 02 Exceeded maximum hard errorlimit.-----------------------------

ErrorCode Error Description Recommended Action------------------------------------------------------------------------------1900 - xx Tape Test The fo

1902 - 01 Drive not installed.1902 - 02 Cartridge not installed.1902 - 03 Tape motion error.1902 - 04 Drive busy error.1902 - 05 Track seek error.----

1904 - 04 Drive busy error.1904 - 05 Track seek error.1904 - 15 Sense error flag.1904 - 27 Drive not compatible withcontroller.1905 - xx Tape Read Tes

1906 - 06 Tape write protected error. The following codes apply toerror codes 1900 - xx through1906 - 14 Drive timeout error. 1991 - xx:1906 - 16 Bloc

o MS-DOS Version 4 Software and Documentation (PN 114493-001 andPN 114496-001)o MS-DOS VERSION 3 REFERENCE GUIDE (PN 114024-001)o BASIC VERSION 3 REFE

2414 - 01 Video White Screen Test2416 - 01 Video Noise Pattern Test------------------------------------------------------------------------------Error

1. Replace the plasma display5103 - 01 Video Attribute Test controller board and retest.2. Replace the plasma display5104 - 01 Video Character Set Tes

Defective Memory IsolationMemory error codes are shown on the display in an 8 digit format (XX000Y ZZ).The XX and Y alphanumeric codes are the key ide

Chapter 7. Illustrated Parts Catalog Chapter 7.1 Introduction This chapter provides a spare parts reference for the COMPAQ PORTABLE 386Personal Compu

Table 7-1. Display Enclosure Assembly==============================================================================Item Description Part Number-------

15. Mandrel * 107386-001------------------------------------------------------------------------------* Included in the Miscellaneous Hardware Kit (PN

Table 7-3 lists the spare parts for the COMPAQ PORTABLE 386 Personal Computerchassis rear assembly. Items numbered 1 through 14 are illustrated inFigu

3. Power Supply Ground Subassembly 107624-0014. Battery 107786-0015. System Board 107683-0016. Microprocessor Cover 107617-0017. System Board Cover 10

Chapter 2. Operating and Performance Specifications Chapter 2.1 Introduction This chapter provides operating and performance specifications for theCO

31. 1 to 2 Megabyte Memory Expansion Board 107686-00132. Display Data Cable Assembly ** 107382-00133. LED/Speaker Cable 107926-00134. Keyboard Cable (

5. Mass Storage Device Enclosure 107131-0046. Fixed Disk Drive Data Cable ** 107798-0017. Fixed Disk Drive Power Cable ** 101741-0038. 40 Megabyte Fix

Table 7-5. Spare Parts for Options==============================================================================Description Part Number---------------

4 Megabyte Memory Expansion Board 107688-0014 Megabyte Memory Extension Board 107685-001COMPAQ 1200 Baud Internal Modem 107376-001COMPAQ 2400 Baud Int

Table 7-6 lists the spare parts in the cable kit (PN 107382-001) for theCOMPAQ PORTABLE 386 and COMPAQ PORTABLE III Personal Computers.Table 7-6. Cabl

Chapter 8. Removal and Replacement Procedures Chapter 8.1 Introduction Before starting the removal procedures, review Chapter 7, "Illustrated Pa

------------------------------------------------------------------------------AC Power Cord:Length 6 ft (1.8 m)Gauge 18 AWG---------------------------

1. Complete the preparation procedure (see Section 8.2).2. Detach the keyboard from the system unit.3. Grasp the keyboard cord near where it connects

To replace the keyboard assembly, reverse steps 1 through 4.Chapter 8.4 Rear Panel To remove the rear panel:1. Complete the preparation procedure (see

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>&g

aside (Figure 8-6).To replace the interface connector cover, reverse steps 1 through 5.Chapter 8.6 Microprocessor Cover To remove the microprocessor c

4. Grasp the microprocessor cover at its edges; gently lift it up and awayfrom the system board and set it aside (Figure 8-8).To replace the microproc

Chapter 8.7 System Board Cover To remove the system board cover:1. Complete the preparation procedure (see Section 8.2).2. Remove the rear panel (see

Chapter 8.8 32 Bit Memory/Modem Interface Board The 32 bit memory/modem interface board connects the memory expansion boards,either internal modem, an

4. Remove the screws securing the 32 bit memory/modem interface board andset them aside.5. Grasp the 32 bit memory/modem interface board at its edges

The top slot holds the second serial interface board or one of the internalmodems. Both the COMPAQ 1200 Baud Internal Modem and the COMPAQ 2400 BaudIn

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

Table 2-3. COMPAQ Dual Mode Plasma Display Specifications==============================================================================Viewing Area Di

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).

To replace the internal modem option, reverse steps 1 through 8.Chapter 8.10 Second Serial Interface Board (International Only) To remove the second s

5. Locate the second serial interface board shown in Figure 8-20.6. Slide the second serial interface board out of the options compartment andset it a

To replace the second serial interface board, reverse steps 1 through 6.Chapter 8.11 Memory Expansion Boards Three memory expansion boards are availab

To remove a memory expansion board:1. Complete the preparation procedure (see Section 8.2).2. Remove the rear panel (see Section 8.4).3. Remove the 32

5. Locate the memory expansion board shown in Figure 8-23.6. Slide the memory expansion board out of the options compartment and setit aside (Figure 8

To replace the memory expansion board, reverse steps 1 through 6.Chapter 8.12 Memory Upgrade Kit Each 1 megabyte memory upgrade kit consists of two 51

5. To release the module, insert a tool, such as a ball point pen, into thehole at one end of the module.6. Grasp the end of the module, pull up, and

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 (

To replace the memory module, simply reinsert it fully into its socket, thenreverse steps 1 through 5.Chapter 8.13 System ROM To remove the system ROM

Tracks per Inch 48Number of Tracks 40Data Transfer Rate 250 Kb/s==============================================================================Chapter

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 appropriatesockets (Figure

Chapter 8.14 System Board NOTE: The system board and the base pan are one assembly and are removedsimultaneously.To remove the system board assembly:1

o Fixed disk drive power cableo LED/speaker cableo Keyboard cableo Display controller board data cableo Battery cable11. Remove the screws that secure

12. Grasp the system board assembly by its edges. Lift it up and away fromthe main enclosure.13. Disconnect the RGBI cable assembly from the plasma di

Chapter 8.15 Plasma Display Controller Board To remove the plasma display controller board:1. Complete the preparation procedure (see Section 8.2).2.

NOTE: Removing the controller board from its compartment also disconnects itfrom the display data cable.13. Disconnect the display controller board da

Chapter 8.16 Mass Storage Device Assembly To remove the mass storage device subassembly:1. Complete the preparation procedure (see Section 8.2).2. Rem

6. Locate the mass storage device subassembly shown in Figure 8-40.7. Remove the screw that secures the mass storage device subassembly to themass sto

8. Slide the mass storage device subassembly out of the mass storage deviceenclosure (Figure 8-42).>>>>>>>>>>>>>

To replace the mass storage device subassembly, reverse steps 7 and 8.>>>>>>>>>>>>>>>>>>>>