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Compaq Compaq 486, Maintenance And Service Manual

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Compaq Compaq 486 Maintenance And Service Manual Download Page 51

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System Unit:

System Chassis

128937-001

Front Bezel

128946-001

Rear Panel

128938-001

Handle
Connector Cover
Enhanced Option Cover

Base Panel

128948-001

Tilt Base

135999-001

Power Supply

128898-001

Fan Assembly

128901-001

Keylock

135901-001

AC Power Cord (U.S./Canada)

121258-001

AC Power Cord (UK)

128943-001

Active Matrix Color Display:

Front Bezel

128946-001

Display Assembly

128902-001

Display Shield
Backlight Assembly

136964-001

Display Shield
Video Cable

128903-001

Display Inverter Board

128900-001

Mass Storage Devices:

210 Megabyte Fixed Disk Drive

128956-001

120 Megabyte Fixed Disk Drive

128955-001

3 1/2 inch 1.44 Megabyte
Diskette Drive

123313-001

Cables:

Power Distribution Board

128935-001

Video Cable

128903-001

Processor and Standard Board Assemblies
and Subassemblies:

Processor Board

128897-001

4 Megabyte Memory Module

118741-001

System ROM

128939-001

Real Time Clock/Battery

126570-001

I/O Board

128949-001

Video Board

128899-001

Display Inverter Board

128900-001

Speaker Assembly

128966-001

Keyboards:

U.S. English

128958-001

Keyboard template

128934-001

UK English

128958-003

German

128958-004

French

128958-005

Italian

128958-006

Spanish

128958-007

Danish

128958-008

Norwegian

128958-009

Swedish/Finnish

128958-010

Swiss

128958-011

Portuguese

128958-013

Latin American

128958-016

Summary of Contents for Compaq 486

Page 1: ... Computer Corporation Copyright 1991 Compaq Computer Corporation All rights reserved Printed in the USA COMPAQ DESKPRO SYSTEMPRO LTE FASTART Registered United States Patent and Trademark Office SLT is a trademark 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...

Page 2: ...m Unit o Full Function 101 102 Key Keyboard o Active Matrix Color VGA Display o Power Supply o 3 1 2 inch 1 44 Megabyte Diskette Drive o 210 and 120 Megabyte Fixed Disk Drives Chapter 1 1 System Unit U S Other Dimensions Height 11 0 inch 27 9 cm Width 15 6 inch 39 6 cm Depth 5 5 inch 13 9 cm Weight with keyboard Model 210 17 6 lb 7 9 kg Model 120 17 6 lb 7 9 kg Environmental Requirements ...

Page 3: ...n Operating 0 25g 5 to 500 Hz 1 2 octave min sweep Nonoperating 1 0g 5 to 500 Hz 1 2 octave min sweep Chapter 1 2 Keyboard English Other Dimensions Height 1 2 inch 3 0 cm Depth 7 4 inch 18 7 cm Width 15 7 inch 39 8 cm Weight 2 65 lb 1 2 kg Number of Keys 101 102 Cable Compressed 24 0 inch 60 9 cm Extended 46 5 inch 118 1 cm Interface 6 pin mini DIN 6 pin mini DIN connector connector Power Volts 4 ...

Page 4: ...Input Nominal Voltage 5 VDC 12 VDC Current Maximum 150 mA 420 mA Power Maximum 0 75W 5 04W Chapter 1 4 Power Supply U S Other Input Requirements Nominal Voltage 120 VAC 240 VAC Maximum Range Voltage 100 to 120 VAC 220 to 240 VAC Line Frequency 60 Hz 50 Hz Current 4A 2A Fuse 5A 5A Operating Power 125W 125W Line Voltage Switching Automatic Automatic Cooling 2 speed fan 2 speed fan thermostatically t...

Page 5: ...rite high density Green Read Write low density Orange Drives Supported One Drive Height 0 75 inch 1 9 cm Drive Rotation rpm 300 Transfer Rate bps high low 500K 250K Bytes Per Sector 512 Sectors Per Track high low 18 9 Tracks Per Side high low 80 80 Access Times Track to Track 3 ms Average 80 ms Settling Time 15 ms Latency Average 100 ms Cylinders high low 80 80 Read Write Heads 2 Chapter 1 6 Fixed...

Page 6: ... rpm 3399 rpm Transfer Rate per second Head 20 MB 12 MB Buffer max 5 MB 4 5 MB Sector Interleave 1 1 1 1 Seek Times Track to Track 3 ms 8 ms Average 12 ms 19 ms Maximum 30 ms 35 ms Cylinders Physical 2119 1522 Logical 683 760 Read Write Heads Physical 4 4 Logical 16 8 Sectors Per Track Physical 49 40 Logical 38 1 spare 39 1 spare Bytes Per Sector 512 512 ...

Page 7: ...dible and or visual message See Chapter 3 Error Messages and Codes for an explanation of the error codes and a recommended course of action Chapter 2 2 Preliminary Steps If you encounter an error condition complete the following steps before starting the problem isolation procedures 1 Turn off power to the computer 2 Disconnect any external devices Do not disconnect the printer if you want to test...

Page 8: ...complete system The user must clear the fixed disk drive password or give you access before servicing can be performed 6 Position the brightness and volume controls approximately in the center of their range 7 Insert the Diagnostics diskette into drive A 8 Turn on the computer 9 Follow the procedures of the Problem Isolation Flowchart section 2 4 Refer to Chapter 3 Error Messages and Codes for det...

Page 9: ...10 Reconnect the AC power 11 Turn on the computer and allow it to complete POST If the key icon o m does not appear when POST completes the power on password has been cleared Chapter 2 4 Problem Isolation Flowchart The problem isolation flowchart provides a quick reference for identifying and correcting problems that may occur during POST The flowchart gives troubleshooting procedures for identify...

Page 10: ...troubleshooting information ...

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Page 17: ...he following steps 1 Short checksum apply to error code 101 101 I O ROM Error 1 Long Option ROM 1 Inspect the ROM 1 Short checksum placement 2 Verify the correct ROM 3 Replace the ROM 102 Processor None Processor board Replace the processor Board Failure DMA timers etc board 162 System Options 2 Short Configuration Run COMPAQ EISA Not Set incorrect or no Configuration utility diskette drive 163 Ti...

Page 18: ... module see Figure 3 1 2 Replace the processor board XX000Y ZZ None Memory failure Replace the 203 Memory processor board Address Error 205 Memory Error None Cache Memory Run Diagnostics XXYYYYY controller or ZZZZZZZZ RAM failure 301 Keyboard None Keyboard 1 Check that keyboard Error failure is connected 2 Replace the keyboard 303 Keyboard None Processor board Replace the keyboard Controller Error...

Page 19: ...3 2 Short Added or removed Configuration modem or second Error modem board 1154 Comm Port 4 2 Short Added or removed Configuration modem or second Error modem board Message Beeps Probable Cause Recommended Action 1771 Primary Disk 2 Short Internal and Run Diagnostics Port Address external fixed disk Assignment drive controllers Conflict are assigned to the primary address 1772 Secondary 2 Short In...

Page 20: ...rror None Fixed disk drive 1 Run Diagnostics error or wrong 2 Replace the drive type drive 1791 Disk 1 Error None Fixed disk drive 1 Run Diagnostics error or wrong 2 Replace the drive type drive XX000Y ZZ Parity None Parity RAM Run Diagnostics Check 2 failure Audible 1 Short Power on None successful Audible 2 Short Power on None successful RESUME None As indicated Press F1 key F1 KEY to continue C...

Page 21: ...tects an error condition The error codes appear in an AYY XX or AAYY XX format A or AA number that represents faulty assembly YY test or action that failed XX a specific problem Example Error code 610 21 shows that the diskette drive failed to get change line status For assistance in the removal and replacement of a particular subassembly see Chapter 5 Removal and Replacement Procedures Table 3 2 ...

Page 22: ... 102 05 Coprocessor exchange command failed 102 06 Coprocessor masked exception incorrectly handled 102 07 Coprocessor unmasked exception incorrectly handled 102 08 Coprocessor wrong mask bit set in status register 102 09 Coprocessor unable to store real number 102 10 Coprocessor real number calculation test failed 102 11 Coprocessor speed test failed 102 12 Coprocessor pattern test failed 102 14 ...

Page 23: ...ne 105 08 Port 61 bit 1 not at one Error Recommended Code Description Action 105 09 Port 61 bit 0 not at one Replace the processor board and retest for error codes 105 10 Port 61 I O test failed 103 xx through 114 xx 105 11 Port 61 bit 7 not at zero 105 12 Port 61 bit 2 not at zero 105 13 No interrupt generated by failsafe timer 105 14 NMI not triggered by failsafe timer 107 01 CMOS RAM test faile...

Page 24: ...of range 112 02 Speed test mixed mode out of range 112 03 Speed test fast mode out of range 112 04 Speed test unable to enter slow mode 112 05 Speed test unable to enter mixed mode 112 06 Speed test unable to enter fast mode 112 07 Speed test system error 112 08 Speed test unable to enter auto mode Error Recommended Code Description Action 112 09 Speed test unable to enter Replace the processor bo...

Page 25: ...hine type and retest test failed 2 Replace the processor board and retest 201 03 Memory machine ID and type test failed 202 xx ROM checksum test failed 202 01 Test failed 202 02 Failed RAM ROM map test 202 03 Failed RAM ROM protect test 202 04 System RAM ROM checksum test failed 203 xx RAM write read test The following steps apply failed to error codes 203 xx through 211 xx 203 01 Memory write rea...

Page 26: ...ror during restore of program memory in walking 1 0 test 205 04 Insufficient memory to perform test 206 xx Increment pattern test failed 208 01 Memory refresh test failed 208 02 Error during saving program memory in refresh test 208 03 Error during restore program memory in fresh test Error Recommended Code Description Action 210 xx Random Pattern Test The following steps apply Failed to error cod...

Page 27: ...ed to error codes 301 xx through 304 xx 301 02 Keyboard short test 1 Check the keyboard interface test failed connection If disconnected turn off 301 03 Keyboard short test echo the computer and test failed connect the keyboard 2 Replace the keyboard 301 04 Keyboard short test failed and retest 3 Replace the I O board 302 01 Keyboard long test failed and retest 303 01 Keyboard LED test 8042 self t...

Page 28: ...ture 304 06 Unable to return to normal mode Table 3 5 Parallel Printer Test Error Codes Error Recommended Code Description Action 401 01 Printer failed or not The following steps apply connected to error codes 401 xx through 403 xx 402 xx Printer port 1 If a printer is connected be sure it 402 01 Printer data register is turned ON and in failed ONLINE mode 2 Replace the printer 402 02 Printer cont...

Page 29: ... and retest and control register failed 3 Replace the I O board and retest 402 15 Printer interrupt loopback data and control register failed 402 16 Printer unexpected interrupt received 402 25 Printer multiple interrupt 402 26 Printer multiple interrupt 403 01 Printer pattern test failed Table 3 6 Active Matrix Color Display Test Error Codes Error Recommended Code Description Action 501 01 Video ...

Page 30: ...es The following steps apply test failed to error codes 600 xx through 610 xx 601 xx Diskette format failed 1 Replace the diskette and retest 602 xx Diskette read test failed 2 Replace the diskette drive and retest 603 xx Diskette write read 3 Replace the I O board compare test failed and retest 4 Replace the power 604 xx Diskette random seek distribution board test failed and retest 605 xx Disket...

Page 31: ...ower write read buffers distribution board and retest 610 09 Failed to format a track 610 10 Failed sector wrap test 610 20 Failed to get drive type 610 21 Failed to get change line status 610 22 Failed to clear change line status 610 23 Failed to set drive type in ID media 610 24 Failed to read diskette media 610 25 Failed to verify diskette media 610 26 Failed to read media in speed test 610 27 ...

Page 32: ...l Port Test address line fault 1101 04 Serial Port Test data line fault 1101 05 Serial Port Test UART control signal failure 1101 06 Serial Port Test UART THRE bit failure 1101 07 Serial Port Test UART DATA READY bit failure 1101 08 Serial Port Test UART TX RX buffer failure 1101 09 Serial Port Test INTERRUPT circuit failure 1101 10 Serial Port Test COM1 set to invalid interrupt 1101 11 Serial Por...

Page 33: ... board and retest for error codes 1109 04 Input line or clock failure 1101 xx through 1109 xx 1109 05 Address line fault 1109 06 Data line fault Table 3 9 Modem Test Error Codes Error Recommended Code Description Action 1201 xx Modem Internal The following steps apply Loopback Test to error codes 1201 xx through 1210 xx 1201 01 UART DLAB bit failure 1 Refer to modem documentation for 1201 02 Line ...

Page 34: ...k the modem line 1201 16 Modem ROM checksum 3 Replace the modem and failure retest 1201 17 Tone detection failure 1202 xx Internal Modem Test 1202 01 Modem timed out waiting for SYNC local loopback mode 1202 02 Modem timed out waiting for response local loopback mode 1202 03 Modem exceeded data block retry limit local loopback mode 1202 11 Modem timed out waiting for SYNC analog loopback originate...

Page 35: ...termination failure 1204 xx Modem Auto Originate Test 1205 xx Modem Auto Answer Test Error Recommended Code Description Action 1206 xx Dial Multifrequency Tone The following steps apply Test to error codes 1201 xx through 1210 xx 1210 xx Modem Direct Connect 1 Refer to modem Test documentation for Configuration utility 1210 01 Modem timed out waiting procedures for SYNC 2 Check the modem line 3 Re...

Page 36: ...the power 1702 xx Fixed disk drive read distribution test failed board and retest 3 Replace the I O board 1703 xx Fixed disk drive write and retest read compare test failed 1704 xx Fixed disk drive random seek test failed 1705 xx Fixed disk drive controller test failed 1706 xx Fixed disk drive ready test failed 1707 xx Fixed disk drive recalibrate test failed 1708 xx Fixed disk drive format bad tr...

Page 37: ...tal error while reading 1719 07 Fatal error while writing Error Recommended Code Description Action 1719 08 Failed compare of The following steps apply write read compare to error codes 1700 xx through 1719 xx 1719 09 Failed to format a track 1 Replace the fixed disk drive and retest 1719 10 Failed sector wrap test 2 Replace the power distribution board 1719 19 Controller failed to and retest deal...

Page 38: ... 1719 55 Failed cylinder 1 1719 56 Fixed disk drive controller RAM diagnostics failed 1719 57 Fixed disk drive controller to drive test failed 1719 58 Failed to write sector buffer 1719 59 Failed to read sector buffer 1719 60 Failed to compare sector buffer 1719 61 Failed uncorrectable Error Correction Code error Error Recommended Code Description Action 1719 62 Failed correctable Error The follow...

Page 39: ...Description Action 1900 xx Tape ID failed The following steps apply to error codes 1901 xx Tape servo write failed 1901 xx through 1906 xx 1902 xx Tape format failed 1 Replace the tape cartridge and retest 1903 xx Tape drive sensor test 2 Replace the tape drive failed and retest 3 Replace the I O board 1904 xx Tape BOT EOT test failed and retest 1905 xx Tape read test failed 1906 xx Tape write rea...

Page 40: ...ceeded 1906 18 Hard error limit exceeded 1906 19 Write probably ID error 1906 20 NEC fatal error 1906 21 Received servo pulses second time but not first 1906 22 Never got to EOT after servo check Error Recommended Code Description Action 1906 23 Change line not set The following steps apply to error codes 1901 xx 1906 24 Write protect error through 1906 xx 1 Replace the tape 1906 25 Unable to eras...

Page 41: ...eo 80 x 25 mode 8 x 8 character cell test failed 2407 01 Video 40 x 25 mode test failed 2408 01 Video 320 x 200 mode color set 0 test failed 2409 01 Video 320 x 200 mode color set 1 test failed 2410 01 Video 640 x 200 mode test failed 2411 01 Video screen memory page test failed 2412 01 Video gray scale test failed 2414 01 Video white screen test failed Error Recommended Code Description Action 24...

Page 42: ...king pointing device and retest 3 Replace the I O board and retest Chapter 3 3 Memory Error Codes Memory error codes appear when the system detects a memory fault during the Power On Self Test 201 or 203 error codes or as a result of a diagnostic test The TEST programs attempt to isolate the memory fault to a specific location then generate a memory error code The memory error code points to a spe...

Page 43: ...ta bit 3 10 data bit 4 20 data bit 5 40 data bit 6 80 data bit 7 unable to determine failed data bit Failed byte Values are 0 1 Always 000 Failed address Values are 00 through 20 0X error in 1st megabyte 1X error in 2nd megabyte 2X error in 3rd megabyte 3X error in 4th megabyte ...

Page 44: ... Parts Catalog This chapter provides an illustrated parts breakdown and identifies the spare parts for the standard features of the COMPAQ PORTABLE 486c Personal Computer Chapter 4 1 Illustrated Parts Breakdown System Unit ...

Page 45: ...r Panel 128938 001 Handle Connector Cover Enhanced Option Cover 4 Base Panel 128948 001 5 Tilt Base 135999 001 6 Power Supply 128898 001 7 Fan Assembly 128901 001 8 Keylock 135901 001 9 AC Power Cord U S Canada 121258 001 UK 128943 001 Not shown Active Matrix Color Display Table 4 2 Active Matrix Color Display ...

Page 46: ...mbly 136964 001 Display Shield 4 Video Cable 128903 001 5 Display Inverter Board 128900 001 Mass Storage Devices Table 4 3 Mass Storage Devices Description Spare Part Number 1 210 Megabyte Fixed Disk Drive 128956 001 2 120 Megabyte Fixed Disk Drive 128955 001 3 3 1 2 inch 1 44 Megabyte Diskette Drive 123313 001 Cables ...

Page 47: ...Table 4 4 Cables Description Spare Part Number 1 Power Distribution Board 128935 001 2 Video Cable 128903 001 Processor Board ...

Page 48: ...le 4 6 COMPAQ PORTABLE 486c Personal Computer I O Board Connectors 1 Enhanced Option Connector 2 Internal Keyboard Connector 3 Fan Assembly Connector 4 Diskette Drive Connector 5 Fixed Disk Drive Connector 6 Processor Slot 7 Video Slot 8 Audio Input Jack 9 EISA Slots 10 I O Board Switches 11 Serial Connector 12 Parallel Connector 13 External Storage Module Connector 14 CD ROM Connector 15 Pointing...

Page 49: ...cription Spare Part Number 1 Processor Board 128897 001 2 4 Megabyte Memory Module 118741 001 3 System ROM 128939 001 4 Real Time Clock Battery 126570 001 5 I O Board 128949 001 6 Video Board 128899 001 7 Display Inverter Board 128900 001 8 Speaker Assembly 128966 001 Keyboard ...

Page 50: ...ish 128958 010 11 Swiss 128958 011 12 Portuguese 128958 013 13 Latin American 128958 016 14 Belgian 128958 018 Not shown Chapter 4 2 Spare Part Numbers The following table provides a list of all of the spare part descriptions and part numbers for standard features of the COMPAQ PORTABLE 486c Personal Computer Refer to the OPTIONS AND PERIPHERALS MAINTENANCE AND SERVICE GUIDE for spare part numbers...

Page 51: ...rive 128956 001 120 Megabyte Fixed Disk Drive 128955 001 3 1 2 inch 1 44 Megabyte Diskette Drive 123313 001 Cables Power Distribution Board 128935 001 Video Cable 128903 001 Processor and Standard Board Assemblies and Subassemblies Processor Board 128897 001 4 Megabyte Memory Module 118741 001 System ROM 128939 001 Real Time Clock Battery 126570 001 I O Board 128949 001 Video Board 128899 001 Disp...

Page 52: ...iskette The software spare part numbers are subject to change Please consult the current price list for the software spare part number before ordering Table 4 10 Miscellaneous Hardware Description Part Number Logo Labels 128944 001 Plastic Parts Kit 135900 001 Access Cover Brightness Volume Controls Board Guide Assembly Keyboard Feet Options Door Options Bezel Screw Covers Switch Cover Hardware Ki...

Page 53: ...t 136967 001 6 32 MA TH T 15 CS Screw Kit 119548 001 6 32 x 1 4 Torx TT HI T WSr Screw Kit 136966 001 6 32 x 1 4 S Torx PNHD Screw Kit 128212 001 6 32 x 1 4 TAPTITE HT Screw Kit 136974 001 6 32 x 1 2 S Torx TT ...

Page 54: ...ctly throughout a normal cycle Or it may function normally for awhile then degrade in the internal layers reducing its life expectancy Networks built into many integrated circuits provide some protection but in many cases the discharge contains enough power to alter device parameters and or melt silicon junctions Generating Static Table 5 1 shows how different methods generate static electricity a...

Page 55: ...ired to ground and proper materials selected to minimize static charging When grounding is not possible use an ionizer to dissipate electric charges Preventing Damage to Drives To prevent static damage to diskette drives and fixed disk drives handle drives gently and perform the following static guarding techniques o Store drives in their original shipping containers o Avoid dropping the drive fro...

Page 56: ...vice kit with a static dissipating vinyl pouch that folds out to a work mat Also use a wrist strap and a ground cord for the work surface Ground the cord to the chassis of the equipment undergoing test or repair Grounding Equipment Use the following equipment to prevent static electricity damage to equipment Wrist Straps are flexible straps with a minimum of 1 megohm ñ 10 resistance in the ground ...

Page 57: ...2 Tool and Software Requirements To service the COMPAQ PORTABLE 486c Personal Computer you need the following o Case utility tool o Flathead screwdriver o Modem terminating plug o Nonconductive probe o ROM removal tool o Torx screwdrivers sizes T 10 and T 15 o 9 pin serial interface loopback plug o 25 pin parallel interface loopback plug Chapter 5 3 Disassembly Assembly Sequence Chart Use the foll...

Page 58: ...OLOR DISPLAY Front Bezel Display Assembly Backlight Assembly Display Inverter Board Speaker Assembly 5 15 POWER DISTRIBUTION BOARD 5 16 KEYLOCK Chapter 5 4 Preparation Procedures Before beginning the removal and replacement procedures complete the following steps 1 Turn off the computer 2 Disconnect the AC power cord from the AC outlet and from the computer Figure 5 1 ...

Page 59: ...wing procedures CAUTION Screws in this system are not interchangeable As you remove screws place them with the component you removed Damage may occur if you insert these screws in the wrong place Chapter 5 5 Keyboard To remove the keyboard complete the following steps 1 Remove the keyboard from storage position by pressing down on the two keyboard latches and pulling the keyboard out from the fron...

Page 60: ...2 Using a nonconductive probe remove the access cover Figure 5 3 3 Disconnect the keyboard cable by gently pulling the keyboard connector tab Figure 5 4 ...

Page 61: ... 5 4 To replace the keyboard reverse the steps in the above illustrations Chapter 5 6 Rear Panel To remove the rear panel complete the following steps 1 Push the tilt adjustment buttons on the sides of the computer in and tilt the display assembly forward Figure 5 5 ...

Page 62: ... T 15 screwdriver Figure 5 5 3 Pull the rear panel out and up until the bottom latches are released from the slots Figure 5 6 To replace the rear panel complete the following steps 1 Position the rear panel on the computer by aligning the bottom latches ...

Page 63: ...driver Chapter 5 7 Options Cover To remove the options cover complete the following steps 1 Remove the rear panel Section 5 6 2 Using a Torx T 15 screwdriver remove three screws from the top of the options cover Figure 5 7 3 Loosen two slotted screws Figure 5 8 4 Lift the options cover off of the slotted screws Figure 5 8 ...

Page 64: ...sion slots Refer to the COMPAQ PORTABLE 486c Personal Computer Reference Guide CAUTION When removing or inserting cables with Zero Insertion Force ZIF connectors do not pull twist or apply tension to cables NOTE The ZIF connectors in this product have mechanical latches that either slide foreword and lift up or slide up to open Be sure the latches on the ZIF connectors are opened before attempting...

Page 65: ...ard out of the slot Figure 5 9 To replace the video board reverse the steps in the above illustration Processor Board To remove the processor board complete the following steps 1 Remove the rear panel Section 5 6 2 Remove the options cover Section 5 7 3 Remove the video board Section 5 8 4 Using a Torx T 15 screwdriver remove five screws securing the processor board to the display pan Figure 5 10 ...

Page 66: ...in the above illustration System ROM To remove the system ROM from the processor board complete the following steps 1 Remove the rear panel Section 5 6 2 Remove the options cover Section 5 7 3 Remove the video board Section 5 8 4 Remove the processor board 5 Locate the system ROM on the processor board Figure 5 11 ...

Page 67: ... replacing the system ROM align Pin 1 with the dot on the system ROM socket Real Time Clock Battery To remove the real time clock battery complete the following steps 1 Remove the rear panel Section 5 6 2 Remove the options cover Section 5 7 3 Remove the video board Section 5 8 4 Remove the processor board Section 5 8 5 Locate the real time clock battery on the processor board Figure 5 12 ...

Page 68: ...ould be accomplished within compliance of local regulations or returned to Compaq Computer Corporation by established parts return methods 6 Cut the tie wrap securing the real time clock battery to the processor board and remove the real time clock battery Figure 5 12 To replace the real time clock battery reverse the steps in the above illustration Chapter 5 9 Power Supply To remove the power sup...

Page 69: ...ched Figure 5 13 5 Remove the switch bezel from the power supply Figure 5 13 To replace the power supply reverse the steps in the above illustration Chapter 5 10 Fan Assembly To remove the fan assembly complete the following steps 1 Remove the rear panel Section 5 6 2 Remove the options cover Section 5 7 3 Carefully disconnect the fan assembly cable Figure 5 14 ...

Page 70: ...hapter 5 11 I O Board To remove the I O board complete the following steps 1 Remove the rear panel Section 5 6 2 Remove the options cover Section 5 7 3 Remove the video board Section 5 8 4 Remove the processor board Section 5 8 5 Remove the power supply Section 5 9 6 Remove the fan assembly Section 5 10 7 Carefully disconnect the diskette drive cable fixed disk drive cable and power cable Figure 5...

Page 71: ... screws securing the I O board Figure 5 15 To replace the I O board reverse the steps in the above illustration Chapter 5 12 Base Panel To remove the base panel complete the following steps IMPORTANT The base panel cannot be removed with the cable lock provision pulled out Be sure the cable lock provision is completely pushed in before performing the following steps 1 Push in the cable lock provis...

Page 72: ... by sliding it out toward the diskette drive side of the computer Figure 5 16 To replace the base panel reverse the steps in the above illustration Chapter 5 13 Mass Storage Devices Diskette Drive To remove the diskette drive complete the following steps 1 Remove the base panel Section 5 12 2 Carefully disconnect the cable from the diskette drive Figure 5 17 ...

Page 73: ...ewdriver remove four screws securing the diskette drive to the drive cage Figure 5 17 To replace the diskette drive reverse the steps in the above illustration Fixed Disk Drive To remove the fixed disk drive complete the following steps 1 Remove the base panel Section 5 12 2 Carefully disconnect the two cables from the fixed disk drive Figure 5 18 ...

Page 74: ...screws securing the fixed disk drive cage then swing the drive cage out Figure 5 18 4 Lift the fixed disk drive out of the cage and remove the shock mounts Figure 5 19 To replace the fixed disk drive reverse the steps in the above illustrations ...

Page 75: ...rew covers from the front bezel Figure 5 20 WARNING The display inverter board contains high voltage Avoid contact with all surfaces of the display inverter board when removing the front bezel 4 Using a Torx T 15 screwdriver remove four Plastite screws securing the front bezel Figure 5 20 5 Pull the front bezel out from the display assembly Figure 5 20 To replace the front bezel reverse the steps ...

Page 76: ...isplay inverter board contains High Voltage Avoid contact with all surfaces of the display inverter board when removing the display assembly CAUTION Before touching the display assembly be sure you are discharged of static electricity by touching a grounded metal object 3 Using a Torx T 15 screwdriver remove four screws securing the display assembly Figure 5 21 ...

Page 77: ...r board cables Figure 5 21 6 Remove the display assembly and the display shield Figure 5 21 To replace the display assembly reverse the steps in the above illustrations CAUTION Do not clean the display screen with soap or isopropyl alcohol Gently wipe the display screen with a clean low lint cloth moistened with water Backlight Assembly To remove the backlight assembly complete the following steps...

Page 78: ...ase the five tabs securing the backlight assembly to the display assembly Figure 5 22 To replace the backlight assembly reverse the steps in the above illustration CAUTION When installing the display assembly cables into the four corner brackets ensure that the cable wires are not pulled twisted or pinched NOTE When replacing the backlight assembly align the five tabs with the display assembly Dis...

Page 79: ...IF connectors do not pull twist or apply tension to cables NOTE The ZIF connectors in this product have mechanical latches that either slide forward and lift up or slide up to open Be sure the latches on the ZIF connectors are opened before attempting to remove the cable 4 Carefully disconnect the power distribution board cable from the ZIF connector on the display inverter board Figure 5 23 5 Car...

Page 80: ...board Figure 5 23 To replace the display inverter board reverse the steps in the above illustration Speaker Assembly To remove the speaker assembly from the display inverter board complete the following steps 1 Remove the keyboard Section 5 5 2 Remove the front bezel Section 5 14 3 Carefully disconnect the speaker assembly cable from the display inverter board Figure 5 24 ...

Page 81: ...the following steps 1 Remove the keyboard Section 5 5 2 Remove the front bezel Section 5 14 CAUTION When removing or inserting cables with ZIF connectors do not pull twist or apply tension to cables NOTE The ZIF connectors in this product have mechanical latches that either slide forward and lift up or slide up to open Be sure the latches on the ZIF connectors are opened before attempting to remov...

Page 82: ...tion 5 7 6 Remove the video board Section 5 8 7 Remove the processor board Section 5 8 8 Remove the power supply Section 5 9 9 Remove the fan assembly Section 5 10 10 Remove the I O board Section 5 11 11 Remove the base panel Section 5 12 12 Carefully disconnect the diskette drive cable fixed disk drive cable and power cable Figure 5 26 ...

Page 83: ...ion board Figure 5 27 14 Carefully pull the I O cables diskette drive cable fixed disk drive cable and power cable through their respective slots and remove the power distribution board Figure 5 27 To replace the power distribution board reverse the steps in the above illustrations ...

Page 84: ...k complete the following steps 1 Remove the rear panel Section 5 6 2 Remove the options cover Section 5 7 3 Using a flathead screwdriver remove the metal clip securing the keylock Figure 5 28 4 Pull the keylock out of the computer Figure 5 28 ...

Page 85: ...able slot However slot 1 must contain a memory module Table 5 3 Memory Expansion COMPAQ PORTABLE 486c Personal Computer Memory Module s Added Total Slot 1 to Slots 2 3 or 4 Memory 4 MB 2 MB 2 MB 6 MB 4 MB 2 MB 2 MB 2 MB 8 MB 4 MB 4 MB 2 MB 8 MB 4 MB 2 MB 2 MB 2 MB 10 MB 4 MB 2 MB 4 MB 2 MB 10 MB 4 MB 2 MB 2 MB 4 MB 12 MB 4 MB 4 MB 4 MB 2 MB 12 MB 4 MB 8 MB 2 MB 12 MB 4 MB 2 MB 4 MB 4 MB 14 MB 4 MB...

Page 86: ...4 MB 2 MB 8 MB 8 MB 22 MB 4 MB 4 MB 8 MB 8 MB 24 MB 4 MB 8 MB 8 MB 8 MB 28 MB 8 MB 8 MB 8 MB 8 MB 32 MB ...

Page 87: ...Controls the integrated OFF Enabled video graphics controller OFF is the default position ON is used to avoid conflict when using a third party video board SW2 ON Enabled Controls EISA configuration OFF Disabled OFF is the default position and allows the user to change the configuration in CMOS ON allows the EISA configuration to be viewed but not changed SW3 ON Enabled Controls Read Write OFF Dis...

Page 88: ...t position and enables the power on password feature ON will clear the power on password SW6 ON Enabled Allows the configuration OFF Disabled memory to be cleared OFF is the default position and allows configuration memory to remain unchanged ON clears the configuration memory ...

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