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o Monitor power connector (COMPAQ PORTABLE 286 only)
o Battery connector (COMPAQ PORTABLE 286 only)
o Speaker connector

See Figure 7.10-1 for the location of each of these connectors.

NOTE:

Once the battery connector has been disconnected from the COMPAQ

PORTABLE 286 system board, reset the time function found in MS-DOS or in
SETUP.

SETUP is found on both the USER PROGRAMS Diskette and the latest

version of the DIAGNOSTICS Diskette.

Locate and remove the four screws that secure the system board mounting
bracket to the system chassis (Figure 7.10-2).

Содержание Deskpro 286 - Desktop PC

Страница 1: ...ark of Microsoft Corporation MAINTENANCE AND SERVICE GUIDE COMPAQ PORTABLE COMPUTER COMPAQ PLUS PERSONAL COMPUTER COMPAQ PORTABLE 286 PERSONAL COMPUTER Second Edition April 1986 Assembly Number 102901...

Страница 2: ...rranty gives you specific legal rights and you may also have other rights that vary from state to state WARNING This equipment has been certified to comply with the limits for a Class B computing devi...

Страница 3: ...d the COMPAQ PORTABLE 286 Personal Computer All troubleshooting and repair procedures are detailed to allow subassembly module level repair only CAUTION Because of the complexity of the individual boa...

Страница 4: ...he COMPAQ PORTABLE 286 Personal Computers Chapter 8 Jumper Settings Switch Settings and Adjustments provides detailed information for setting jumpers and switches It also provides instructions for adj...

Страница 5: ...PAQ computer products Associated Documentation o COMPAQ PORTABLE COMPUTER OPERATIONS GUIDE PN 100001 001 o COMPAQ PLUS PERSONAL COMPUTER OPERATIONS GUIDE PN 100633 001 o COMPAQ PORTABLE 286 PERSONAL C...

Страница 6: ...PORTABLE 286 Personal Computer are o Electrical and mechanical o Environmental o Keyboard o Video display o 20 megabyte fixed disk drive o 10 megabyte tape drive o 1 2 megabyte diskette drive o 360 Kb...

Страница 7: ...Display Specifications Display o Nine inch diagonal 90 degree deflection o High persistence green phosphor o Etched surface to reduce glare o 80 character by 25 line screen o 40 character by 25 line...

Страница 8: ...on fuse rating VDC Output Nominal Current Current Regulation Voltage Amps Amps Tolerance VDC Minimum Maximum Percent 5 0 2 0 10 0 5 5 0 0 0 0 5 5 12 0 1 0 5 0 5 12 0 0 0 0 5 5 These values are maximum...

Страница 9: ...Keyboard Cable Length 72 in 1828 8 mm Gauge 28 AWG Video Display Specifications Display o Nine inch diagonal 90 degree deflection o High persistence green phosphor o Etched surface to reduce glare o...

Страница 10: ...High Density Diskettes Tracks per Inch 96 Number of Tracks 80 When formatted with MS DOS Data Transfer Rate 300 500 Kb s 360 Kbyte Diskette Drive Specifications Dimensions Height 1 60 in 4 0625 cm De...

Страница 11: ...Nominal Current Current Regulation Voltage Amps Amps Tolerance VDC Minimum Maximum Percent 5 0 1 5 15 0 2 5 0 0 0 0 5 5 12 25 1 0 5 0 2 12 25 0 0 1 5 3 internal monitor 12 0 0 0 1 0 5 These values are...

Страница 12: ...oller Board o Diskette Printer Controller Board o Asynchronous Communications Clock Board o System Board o Memory POST also detects the type s of mass storage device s installed in the computer When t...

Страница 13: ...e latest version of the COMPAQ DIAGNOSTICS Program diskette into drive A and close the drive door 8 Place the ON OFF switch in the ON position See Chapter 4 DIAGNOSTIC Procedures for detailed informat...

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Страница 17: ...Chapter 3 Setup Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on SETUP...

Страница 18: ...Chapter 4 Diagnostic Procedures Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on DIAGNOSTICS...

Страница 19: ...rror message results if a problem is encountered during the Power On Self Test program This program runs automatically when the system is turned on The tables list the messages the audible beep messag...

Страница 20: ...ecalibration Parity Check 2 XX000B None Expansion RAM Main Memory on COMPAQ YYZZ PORTABLE 286 Audible 1 Short Power On successful COMMON 6 MHz speed Audible 2 Short Power On successful FAST 8 MHz spee...

Страница 21: ...run the DIAGNOSTICS Program Follow this procedure until the DIAGNOSTICS Program no longer detects an error condition For assistance in the removal and replacement of a particular subassembly see Chapt...

Страница 22: ...ed 104 02 8259 interrupt controller slave test failed 104 03 8259 software RTC is inoperative 105 01 Port bit 6 not at zero 105 02 Port bit 5 not at zero 105 03 Port bit 3 not at zero 105 04 Port bit...

Страница 23: ...aker test failed 1 Replace the speaker 2 Replace the system board Error Error Required Code Description Action Memory 2yy xx 201 01 Memory machine ID test The following steps apply to error codes 201...

Страница 24: ...Code Description Action Keyboard 3yy xx 301 01 Keyboard short test 8042 The following steps apply to error self test failed codes 301 01 through 304 01 301 02 Keyboard short test 1 Replace the keyboar...

Страница 25: ...de 402 02 Printer controller register 2 Check switch 2 on the failed diskette tape controller board see Chapter 8 402 03 Printer data and controller 3 Replace the printer and or the register failed pr...

Страница 26: ...402 16 Printer unexpected interrupt received 403 01 Printer pattern test failed Error Error Required Code Description Action Video Display Unit VDU 5yy xx 501 01 VDU controller test failed The followi...

Страница 27: ...te drive write read Chapter 8 compare 2 Replace the diskette tape controller board 604 xx Diskette drive random seek 3 Replace the diskette drive drive power and signal cables 4 Replace the diskette d...

Страница 28: ...et change line Chapter 8 status 2 Replace the diskette tape controller board 610 22 Failed to clear change 3 Replace the diskette drive power and signal cables 610 23 Failed to set drive type in 4 Rep...

Страница 29: ...et to interrupt 3 Error Error Required Code Description Action Serial 11yy xx 1101 11 Serial Port Test COM 2 The following steps apply to all set to interrupt 4 11yy xx related error codes 1101 12 Ser...

Страница 30: ...isk drive seek test assembly 5 Replace the system board 1705 xx Fixed disk drive controller test 286 based COMPAQ Personal Computers only 1706 xx Fixed disk drive ready test 1707 xx Fixed disk drive r...

Страница 31: ...through 1716 59 1716 10 Failed sector wrap test 1 Check the fixed disk drive 1716 40 Failed cylinder 0 controller board for the proper switch setting 1716 41 Drive not ready see Chapter 8 2 Replace th...

Страница 32: ...ler to drive test Computers only failed 1716 58 Failed to write sector buffer 1716 59 Failed to read sector buffer 1716 60 Non COMPAQ fixed disk drive controller ROM Error Error Required Code Descript...

Страница 33: ...NEC765 fatal error 1906 21 Got servo pulses 2nd time but not 1st 1906 22 Never got to EOT after servo check Chapter 5 4 Memory Error Codes This section is divided into two parts The first part contain...

Страница 34: ...First determine which table to reference see COMPAQ PORTABLE 286 Memory Configuration Next determine which bank to reference and which byte high or low Finally determine the defective chip row locati...

Страница 35: ...0 B 1 YY or ZZ Low High Low High 01 U5 U6 U7 U8 02 U20 U21 U22 U23 04 U25 U26 U27 U28 08 U41 U42 U43 U44 10 U47 U48 U49 U50 20 U63 U64 U65 U66 40 U70 U71 U72 U73 80 U81 U82 U83 U84 00 U88 U89 U90 U91...

Страница 36: ...oards have been reinstalled in the system begin the problem isolation procedure again to verify proper operation of the CPU memory subsystem Table 5 4 4 COMPAQ Portable and COMPAQ PLUS System Board Me...

Страница 37: ...U79 Replace Memory Chip 2002 201 Bank 2 Data Bit 1 U85 or U79 Replace Memory Chip 2004 201 Bank 2 Data Bit 2 U78 or U79 Replace Memory Chip 2008 201 Bank 2 Data Bit 3 U72 or U79 Replace Memory Chip 20...

Страница 38: ...ss 40yy 201 256 Kbytes 48yy 201 288 Kbytes 50yy 201 320 Kbytes 58yy 201 352 Kbytes 60yy 201 384 Kbytes 68yy 201 416 Kbytes 70yy 201 448 Kbytes 78yy 201 480 Kbytes 80yy 201 512 Kbytes yy Code Failed Bi...

Страница 39: ...M NUMBER A reference number for parts in the list o PART NUMBER The number to use when ordering parts from COMPAQ Computer Corporation o DESCRIPTION The name of the particular part or parts kit This s...

Страница 40: ...ist Chassis Front Item Number Part Number Description 1 100025 001 Handle 2 100025 001 Handle Bushing 3 100025 001 Handle End Cap 4 101097 001 Upper Case 5 101098 001 Access Panel 6 100025 001 Screw 1...

Страница 41: ...mon Chassis Front Item Number Part Number Description 1 105034 001 Monitor Assembly 2 102709 001 Screw 4 40 1 4 T 10 Torx 3 100436 002 High Voltage Access Plate 4 100330 001 Storage Device Access Plat...

Страница 42: ...001 Diskette Drive Shield Half Height These parts are included in the Miscellaneous Hardware Kit PN 102709 001 These parts are included in the Cable Kit PN 100512 001 Part number no longer available...

Страница 43: ...1 102709 001 Screw 4 40 x 1 4 T 10 Torx 12 100439 001 System Board Connector Access Plate These parts are included in the Miscellaneous Hardware Kit PN 102709 001 Part number no longer available For p...

Страница 44: ...Personal Computers Parts List System Chassis Front Item Number Part Number Description 1 100260 001 Power Cable Harness Assembly 2 102709 001 Screw 4 40 x 1 4 T 10 Torx 3 102709 001 Screw 6 32 x 1 4...

Страница 45: ...er part or parts kit numbers used to place part orders with Compaq Computer Corporation Each parts list has three columns which are o ITEM NUMBER A reference number for parts in the list o PART NUMBER...

Страница 46: ...ble Table 6 2 2 COMPAQ PORTABLE 286 Personal Computer Parts List Chassis Front Item Number Part Number Description 1 100025 001 Handle 2 100025 001 Handle Bushing 3 100025 001 Handle End Cap 4 101097...

Страница 47: ...86 Personal Computer Parts List Common Chassis Front A Item Number Part Number Description 1 105034 001 Monitor Assembly 2 102709 001 Screw 4 40 1 4 T 10 Torx 3 100436 002 High Voltage Access Plate 4...

Страница 48: ...cluded in the Miscellaneous Hardware Kit PN 102709 001 These parts are all included in the Cable Kit PN 102933 001 Part number no longer available Table 6 2 4 COMPAQ PORTABLE 286 Personal Computer Par...

Страница 49: ...e 12 101299 001 Dual Drive Enclosure 13 101488 001 Tape Drive Cartridge 14 102709 001 Security Lock Switch These parts are all included in the Miscellaneous Hardware Kit PN 102709 001 Part number no l...

Страница 50: ...rew 8 32 x 3 8 T 15 Torx 10 101798 001 Power Switch Filter Assembly 11 102930 001 AC Line Fuse 12 100439 001 System Board Connector Access Plate 13 102929 001 replaced by 160272 001 Lithium Battery Th...

Страница 51: ...001 Part number no longer available Table 6 2 7 COMPAQ PORTABLE 286 Personal Computer Parts List System Chassis Front Item Number Part Number Description 1 102933 001 System Power Cable 2 102709 001...

Страница 52: ...001 System Chassis Assembly 10 102709 001 Tie Wrap 11 102709 001 Push Mount These parts are all included in the Miscellaneous Hardware Kit PN 102709 001 This part is included in the Cable Kit PN 1029...

Страница 53: ...wer supply subsystem and the monitor enclosure When procedures differ specific instructions are given Also note that when you are instructed to cut a tie wrap for removal of an assembly you should als...

Страница 54: ...ect any peripheral devices printer monitors and so on from the computer 4 Disconnect the AC power cord from its power source and from the computer Figure 7 2 2 Chapter 7 3 Access Cover Removal and Rep...

Страница 55: ...ould cause severe electrical shock To remove the access cover 1 Complete the Preparation Procedure in Section 7 2 2 Place the curved end of the access cover lever in the first notch located on the edg...

Страница 56: ...e computer from all AC voltage sources can cause dangerous voltages to be present on the power supply and monitor Even when the ON OFF switch is set to the OFF position any electrically conductive mat...

Страница 57: ...board If the retainers are not rotated serious internal damage may result Chapter 7 5 High Voltage Access Plate Removal and Replacement To remove and replace the high voltage access plate 1 Complete t...

Страница 58: ...e 7 6 1 Lift it off and set it aside To replace the mass storage device access plate reverse Steps 1 through 3 CAUTION In the COMPAQ PORTABLE 286 Personal Computer the mounting screw on the fixed disk...

Страница 59: ...reverse Steps 1 through 4 Chapter 7 8 Power Supply Subsystem Removal and Replacement For COMPAQ Portable or COMPAQ PLUS Personal Computers with a serial number 1524020B0001 or above and for COMPAQ POR...

Страница 60: ...se the power switch filter assembly the power supply assembly and the fan bracket assembly COMPAQ Portable AC Line Fuse Removal and Replacement To remove and replace the COMPAQ Portable AC line fuse 1...

Страница 61: ...a holding area in the fuse box Figure 7 8 3 Lift out the defective fuse and replace it with the spare fuse 4 Slide the fuse box back into the case With your thumb press the cover in until you feel it...

Страница 62: ...MPAQ Portable Power Switch Filter Assembly Removal and Replacement To remove the COMPAQ Portable power switch filter assembly 1 Complete the High Voltage Access Plate Removal procedure see Section 7 5...

Страница 63: ...es will make the connector grip the pins tighter which will damage the connector 5 Remove the 1 4 inch hex nut that secures the power switch filter assembly ground strap and carefully lift the power s...

Страница 64: ...upply Assembly Removal and Replacement To remove the COMPAQ Portable power supply assembly 1 Complete the High Voltage Access Plate Removal procedure see Section 7 5 2 Remove the power switch filter a...

Страница 65: ...hexhead screw that is on the lower corner of the power supply assembly Figure 7 8 8 5 Partially close the access door panel to allow the standoffs to disengage the chassis 6 Slide the power supply ass...

Страница 66: ...Be sure to securely tighten the mounting screw with the 5 16 inch box end wrench because using only the socket extension wrench may not securely tighten the mounting screw thereby causing grounding p...

Страница 67: ...onnector do not pry Pulling on the wires makes the connector grip the pins tighter which will damage the connector 3 Open the access door panel 4 Remove the four screws that hold the fan bracket assem...

Страница 68: ...ss hole and chassis To replace the fan bracket assembly reverse Steps 1 through 5 COMPAQ PORTABLE 286 Power Supply Subsystem Removal and Replacement also for COMPAQ Portable and COMPAQ PLUS Personal C...

Страница 69: ...o remove the AC line fuse 1 Complete the Preparation Procedure see Section 7 2 2 Slide the access door panel open to expose the power switch filter assembly Figure 7 8 13 3 Insert a flat bladed screwd...

Страница 70: ...8 15 Lift out the defective fuse and replace it with the spare one NOTE If the fuse has been replaced a number of times the fuse clips may lose their tension and not make good contact with the fuse Ch...

Страница 71: ...rocedure see Section 7 5 2 Open the access door panel 3 Loosen DO NOT REMOVE the screw that secures the fan bracket assembly to the chassis at the rear of the monitor 4 Now remove the remaining three...

Страница 72: ...N Pull only on the connector do not pry Pulling on the wires makes the connector grip the pins tighter which will damage the connector 6 Lift the fan bracket assembly up and out of the computer Figure...

Страница 73: ...MPAQ PORTABLE 286 Power Supply Assembly Removal and Replacement To remove the Power Supply Assembly 1 Complete the Fan Bracket Assembly Removal procedure 2 Carefully disconnect the power switch filter...

Страница 74: ...he upper or lower right corner of the power supply assembly Figure 7 8 20 4 Partially close the access door panel to allow the standoffs to disengage the chassis 5 Slide the power supply assembly towa...

Страница 75: ...en the mounting screw with the 5 16 inch box end wrench because using only the socket extension wrench may not securely tighten the mounting screw thereby causing grounding problems COMPAQ PORTABLE 28...

Страница 76: ...tie wrap that hold the power switch ground cable 4 Lift the power switch filter assembly out and place it on the chassis Figure 7 8 23 5 Disconnect the power switch filter assembly connector from the...

Страница 77: ...oller and Expansion Board Removal and Replacement Before beginning this procedure become familiar with the locations of controller and Controller Board expansion boards and their specific signal cable...

Страница 78: ...s by pulling the connectors away from the board Figure 7 9 2 CAUTION Pull only on the connector do not pry Pulling on the wire makes the connector grip the pins tighter which will damage the connector...

Страница 79: ...onto each board installed in your computer If you changed to a board of a different height rotate the retainers to match the height of the board If the retainers are not rotated serious internal damag...

Страница 80: ...e video display signal cable Figure 7 9 4 NOTE Controller and expansion board retaining screws may be located either inside or outside the chassis A tie wrap secures the video display signal cable Rem...

Страница 81: ...ters on the system board and out of the computer Figure 7 9 5 To replace the video display controller board reverse Steps 1 through 4 NOTE Be sure that the board is in the board guide on the left Disk...

Страница 82: ...available that are located on both sides of the connector Figure 7 9 6 4 Remove the retaining screw that secures the diskette tape controller board 5 Gently pull the board up and out of its socket J10...

Страница 83: ...he computer Also be sure that the board is in the board guide on the left Expansion Board Removal and Replacement To remove COMPAQ memory expansion boards or any other expansion boards installed in th...

Страница 84: ...remove and replace memory options in a COMPAQ Portable and COMPAQ PLUS Personal Computer without removing the system board it is not recommended because of the limited amount of space inside the chass...

Страница 85: ...ctors NOTE Once the battery connector has been disconnected from the COMPAQ PORTABLE 286 system board reset the time function found in MS DOS or in SETUP SETUP is found on both the USER PROGRAMS Diske...

Страница 86: ...x nylon standoffs attached to the bottom of the system board clear the mounting holes Carefully lift the system board out of the chassis Figure 7 10 3 To replace the system board reverse Steps 1 throu...

Страница 87: ...sable Alter insertion carefully check that all pins are in the socket and that none are bent or are outside of the socket NOTE The system boards for the COMPAQ Portable and COMPAQ PLUS are quite diffe...

Страница 88: ...2 Using the special IC removal tool remove the defective memory or ROM chip s Figure 7 10 6 3 Using the special IC insertion tool replace the defective memory or ROM chip s Figure 7 10 7...

Страница 89: ...mponent run the latest version of DIAGNOSTICS to verify that the replaced component functions properly Chapter 7 11 Mass Storage Device Removal and Replacement Mass storage devices are installed in tw...

Страница 90: ...diskette drive and blank panel or diskette drive and tape drive or two diskette drives o Enclosure B contains fixed disk drive ONLY Mass Storage Device Enclosure B Removal and Replacement To remove En...

Страница 91: ...CAUTION Pull only on the connector do not pry Pulling on the wires makes the connector grip the pins tighter which will damage the connector 5 Raise the computer as shown in Figure 7 11 3...

Страница 92: ...the computer to its flat position on the work surface 8 Remove the top mounting screw from Enclosure B Figure 7 11 4 9 Slide Enclosure B towards the rear of the system chassis lift it from the chassi...

Страница 93: ...is To do this remove the hex nut at the bottom of the face plate LED assembly before removing Enclosure B To replace Enclosure B reverse Steps 1 through 10 CAUTION When removing the enclosure do not b...

Страница 94: ...6 of a COMPAQ PORTABLE 286 Personal Computer CAUTION Pull only on the connector do not pry Pulling on the wires makes the connector grip the pins tighter which will damage the connector 5 Raise the co...

Страница 95: ...osure A These screws are shorter than those used in Enclosure B To avoid damaging the drives return the correct screws to the correct locations when replacing the drive assemblies 7 Return the compute...

Страница 96: ...8 Slide Enclosure A to the rear of the computer and lift it up and out of the computer Figure 7 11 9 CAUTION When removing the enclosure do not bend the ground strap located on the top...

Страница 97: ...s to be removed This guide refers to the device closest to the monitor as 1A and the other device as 2A Figure 7 11 10 NOTE Step 9 describes removing Device 2A Step 10 describes removing Device 1A To...

Страница 98: ...ce the drive insulator pad if it was removed when replacing devices in this enclosure To remove Device 1A from the enclosure 10 Remove the two mounting screws from each side of Enclosure A and slide t...

Страница 99: ...uter chassis required a redesign of the monitor enclosure Figure 7 12 1 This new design of the monitor enclosure PN 105034 001 no longer available is used in COMPAQ Portable Computers with the serial...

Страница 100: ...4 Using the special two piece socket power supply removal tool or box end wrench remove the two screws that secure the monitor enclosure to the wall of the power supply subsystem area Figure 7 12 2 5...

Страница 101: ...omputer to its flat position on the work surface 10 Remove the last two screws that secure the monitor enclosure to the top front of the chassis Figure 7 12 4 11 Disconnect the monitor power signal co...

Страница 102: ...t the monitor enclosure up and out of the chassis and rest one edge on the chassis Carefully pull the monitor power cable through the hole in the floor of the monitor assembly Lift the monitor enclosu...

Страница 103: ...Pulling on the wires makes the connector grip the pins tighter which will damage the connector 3 Position the computer with the keyboard facing you Unlock the keyboard and gently pull the keyboard ca...

Страница 104: ...e COMPAQ PORTABLE 286 Personal Computer ONLY The security lock switch assembly consists of the lock and a lock switch To remove the security lock switch assembly 1 Complete removal procedures for all...

Страница 105: ...the keyboard from the front of the computer 5 Locate the security lock switch assembly on the Enclosure B front plate 6 Remove the security lock switch assembly by removing the speed clip that secures...

Страница 106: ...attery Removal and Replacement NOTE This procedure is to be performed by Authorized COMPAQ Dealers ONLY To remove the battery 1 Complete the system board removal procedure see Section 7 10 and Figure...

Страница 107: ...NOTE When the battery is disconnected rerun SETUP when the battery is replaced if CMOS memory has not retained the information entered during SETUP To replace the battery reverse Steps 1 through 3...

Страница 108: ...to be changed when the system configuration is changed Any time jumpers are changed in a COMPAQ PORTABLE 286 Personal Computer the SETUP program must be run on the system to change the system configu...

Страница 109: ......

Страница 110: ...PLUS and COMPAQ PORTABLE 286 NOTE Jumpers J3 and J5 must both be changed at the same time or the video display controller board will malfunction Chapter 8 3 Compaq Portable 286 Fixed Disk Drive Contro...

Страница 111: ...MPAQ PORTABLE 286 board For the location of the COMPAQ PORTABLE 286 system board jumpers see Figure 8 4 1 If the speed select jumper ES is changed to the 6 MHz speed pin 2 to pin 3 the system will ope...

Страница 112: ...lect Primary or fast Secondary or common speed 8 MHz speed default setting EM Future Use Do not change Do not change default setting E1 E3 System Board Memory 128 Kbytes 640 Kbytes or MS 256 Kbytes or...

Страница 113: ...AQ PORTABLE 286 diskette tape controller board For the locations of the COMPAQ PORTABLE 286 diskette tape controller board jumpers and switch see Figure 8 5 1 Table 8 5 COMPAQ PORTABLE 286 Diskette Ta...

Страница 114: ...n Function Switch Setting J1 Serial communications open connectors COM1 Shunt Jumper on left side IRQ4 open connectors COM2 on right side IRQ3 J2 Controller address select open connectors on Shunt Jum...

Страница 115: ...ettings and the banks for memory expansion Table 8 6 Memory Expansion Board 1 0 to 3 0 Megabyte Address Range Jumper Setting E1 E1 and E5 E6 Banks Installed Resulting Expansion Memory 1 512 Kbytes 1 2...

Страница 116: ...either 64K x 1 RAM chips or 256K x 1 RAM chips Bank 3 also consists of nine sockets that can be populated either with 64K x 1 RAM chips or 256K x 1 RAM chips The following chart shows the possible mem...

Страница 117: ...itch Position Settings Position 1 2 3 4 5 6 7 8 Description of Function OFF Not Used Always OFF default setting ON Coprocessor Always ON default setting OFF OFF Processor Board Memory Always OFF defau...

Страница 118: ...2 tells the system the amount of available RAM NOTE If the ROMs installed in socket s U40 and U47 if available are Revision C or above SW2 is ignored Therefore on system boards of Revision J or above...

Страница 119: ...o that pins 5 12 6 11 7 10 and 8 9 are connected To enable Alternate Banks 2 and 3 insert the shunt jumper so that pins 1 16 2 15 3 14 and 4 13 are connected The banks are selected by removing the shu...

Страница 120: ...system If two boards are installed incorrect operation will result For locations of the COMPAQ Portable and COMPAQ PLUS asynchronous communications clock board jumper settings see Figure 8 8 1 See Tab...

Страница 121: ...ed Chapter 8 9 Output Connector Pin The following tables provide the output connector pin assignments o Table 8 9 1 25 pin asynchronous connector o Table 8 9 2 25 pin parallel connector o Table 8 9 3...

Страница 122: ...2 Receive Data RX 3 Request To Send RTS 4 Clear To Send CTS 5 Data Set Ready DSR 6 Signal Ground GND 7 Carrier Detect CD 8 Transmit current loop data 20 mA 9 5 VDC 200 mA fuse on board 10 Transmit cur...

Страница 123: ...A 24 Pins 23 and 24 No connection on the full height Serial Interface Board Table 8 9 2 25 Pin Parallel Connector Signal Names and Description Pin Number Strobe 1 Data Bit 0 2 Data Bit 1 3 Data Bit 2...

Страница 124: ...begin the adjustment procedure be sure to complete each step before beginning the next one To complete the adjustment procedures you need the following equipment o All tools required to service COMPAQ...

Страница 125: ...A caution message similar to the following appears CAUTION DATA WILL BE DESTROYED INSERT A BLANK FORMATTED DISKETTE IN DRIVE A Press the ENTER key when ready 6 Remove the DIAGNOSTICS diskette from the...

Страница 126: ...ms 2 Wait approximately 5 to 6 seconds or until you see the displayed value stabilize Remember that this is a continuously cycling test on a COMPAQ Portable or COMPAQ PLUS The values will continue to...

Страница 127: ...GNOSTICS Diskette latest version o Set of standard television adjustment tools o Personal Computer Display Template PN 100686 001 No longer available Read the entire procedure carefully and completely...

Страница 128: ...splay screen fall within the range specified on the adjustment template Width may change between high and low resolution mode and should be adjusted for a good compromise NOTE When making adjustments...

Страница 129: ...ct the character height enough to warrant a readjustment for character height 2 If the vertical linearity control does not exist on your video display unit it is preset and controlled by the video dis...

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