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IBM System 9000 Troubleshooting And Servicing

Benchtop computer
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IBM System 9000
Troubleshooting and Servicing
the IBM 9001 Benchtop Computer
GC22-9338

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Summary of Contents for IBM System 9000

  • Page 1 ---- -- -- - - -- - --- --- - - ---·- IBM System 9000 Troubleshooting and Servicing the IBM 9001 Benchtop Computer GC22-9338...
  • Page 2 ---- ---- - - - - --- - - ---· IBM System 9000 Troubleshooting and Servicing the IBM 9001 Benchtop C�mputer GC22·9338...
  • Page 3 . Such references or information must not be construed to mean that IBM intends to announce such IBM products , programming , or s e rvices in your count ry . Requests for copies o f this or other IBM System...
  • Page 4 Note on System Diagnostics Error messages displayed on the screen during power-on diagnostics direct the user to a section in IBM Svstem 9000 Problem Isolation. That manual has been replaced by Troubleshooting and Servicing the IBM 9001 Benchtop GC22-9338. The list below cross-references sections in the problem isolation manual...
  • Page 6 Chapter 4 - - "Cable Checks" - - contains information that can assist you to check the rep l aceable cab l es of the IBM 9 0 0 1 . Chapter 5 - - " Removal and Rep l acement Procedures" - - contains det a i l ed information for the remova l and rep l acement o f a l l Customer Replaceable Units (CRUs ) .

  • Page 7: Table Of Contents

    CONTENTS SAFETY PRACTICES 1 - 1 1 . 0 Introduction 2 - 1 2 . 0 Fault Detection 2 - 1 2 . 1 Scope 2 - 1 2 . 2 Computer Startup 2 - 8 2 . 3 Automatic D iagnostic Testing 2 - 1 0 Keyboard Problems .
  • Page 8 3 - 1 8 3 . 1 1 Feature Board Checks ..3 - 1 8 3 . 1 1 . 1 Power Source Verification 3 - 1 9 3 . 1 1 . 2 Feature Board Loading Check 3 .
  • Page 9 5 - 2 3 5 . 10 . 1 Removal 5 . 1 0 . 2 5 - 25 Replacement 5 - 2 9 5 . 1 1 Printer/Plotter R ibbon 5 - 2 9 5 . 1 1 . 1 Removal .
  • Page 10 LIST OF ILLUSTRATIONS 2 - 1 . Keypad 3 - lA . Diagram - Vert ical Board Check 3 - lB . Vertical Board Check 3 - 2 . Keypad , Softkeys and Keyboard 3 - 3 . Keyboard Key Codes 3 - 4 .
  • Page 11 5 - 29 . 81 1 Diskette Drive Power Supply - 8 1 1 Diskette 5 - 30 . 5 - 3 1 . Hard Disk Drive As s embly External Connections 5 - 32 . Hard Disk Drive Assembly ( S ide View) 5 - 33 .
  • Page 12 SAFETY PRACTICES A l l service representatives are expected to take every safety precaution possible while maintaining IBM Instruments Inc . equipment . Observe the fol lowing s afety practices at all times: Never work alone under hazardous conditions or around equipment with dangerous voltage .
  • Page 13 Avoid contacting ground potent i a l (metal f loor strips , machine • frames , etc . - - use suitab le rubber mats purchased local ly if necessary ) . Safety Glas s es must be worn when you are : Us ing a hammer for driving pins , riveting, staking , etc .
  • Page 14 The manual organized so that faults are described in the order that Operator ob­ they are detected during normal operation of the IBM 9001. servations and diagnostic routines are used to isolate faulty CRUs. trained servj cc personnel, optional checks are provided...
  • Page 15 Introduction...
  • Page 16 2 . 2 COMPUTER STARTUP Prior to powering on the IBM 900 1 , inspect it to ensure that a l l cables are connected , a l l fuses are in good orde r , and the ROM plug-in drawer is seated prope r l y .
  • Page 17 To power ON : Set the Onl ine/ O f f l ine/Form Set switch on the keypad to O f f l ine . • Set the Power switch on the computer to ON . • Now observe these events l isted . If any event (or events) do not occur, use this chart to determine what procedure to fo l low to correct the prob lem.
  • Page 18 . If the LED is f l ashing , replace the p l anar board , the MMU board , and the MMU interface assembly . Return the processor unit to IBM for repair . Fault Detection 2 - 3...
  • Page 19 I f a test 6 error occurs and a MMU board and/or a P l anar board Note : requires rep lacement , the interface assembly shou ld also be replaced . Incorrect memory capacity or defect ive memory expansion board . Re­...
  • Page 20 MEMO RY BOARD SWITCH SETT I N GS SWITCH SWITCH BANK 1 MEMOR Y BANK 2 43 21 43 2 1 8765 8 7 65 S I ZE 010 1 256K START 0000 0010 0000 1 00 1 5 1 2K ADDRESS 0000 1 1 0 1...
  • Page 21 Memory Boards P/N 6404313 through 640431 6 Switch bank 1 i s used t o set the start ing address o f the board . This done by entering the actual starting address minus one as a hexadecimal number . Therefore , a starting address of 20000 is entered as 20000 - 1 or lFFFF .
  • Page 22 MEMORY BOARD S W I TC H SETT I N G S SWITCH SWITCH BANK 2 BANK 1 MEMORY 8 765 4 3 2 1 8 765 4 3 2 1 SIZE 256K START 0000 0001 0000 0 1 10 ADDRESS 1 0 1 0 5 12K...
  • Page 23 A U TOMAT IC D I AGNOSTIC TEST I N G The IBM 9 0 0 1 per forms automat ic diagnos tic test ing each time the power is turned ON . Fai lure of one of the automat ic diagnostic tests is usually the first indicat ion o f a fault in the system .
  • Page 24 MMU board, and the MMU interfac assemb l y . Return the processor unit to IBM for repair . Remove memory board and repeat test 7 . I f retest passes , replace memory board .
  • Page 25 Test LED 'Test Number' LED Figure 2 - 1 . Keypad 2 . 4 KEYBOARD PROBLEMS Keyboard problems may result from mal functions in the keyboard, its interconnecting cab l e , or the p l anar board . Keys that are "dead" or "sticky"...
  • Page 26 2 . 5 KEYPAD AND SOFTKEY PROBLEMS Keypad or softkey problems may result from mal functions in the keypad , its interconnecting cab l e , the softkeys , the CRT disp lay unit , the CRT ' s interconnecting cab les , or the p l anar board . Keys that are intermittent or "dead"...

  • Page 27: Printer/Plotter Cont Ro L Board

    SYMPTOM(S) I • lamp Power does not l ight • Power lamp f l ashes Fault lamp stays lit 1 · • Fault lamp f l ashes Onl ine l amp does not 1 · l ight • Onl ine l amp f l a shes •...
  • Page 28 2 . 7 CRT D I SPLAY PROBLEMS CRT disp lay probl ems are revealed through distorted , faulty, or miss ing video . These problems may be caused by faults in the CRT display un it , in the interconnecting cab l e , in the planar board, in the power supply, or in the printer/plotter control board.
  • Page 29 CRT disp l ay unit replace B looming video Doub l e image CRT display unit replace F luttering or shifting image Resul ting from a l ternating magnetic field caused by rotat ing machinery or Move or shield the CRT . power l ines .
  • Page 30 If the P3 - P800 cable should need See Chapter 4 , "Cable Checks . " check . replacing, the system has to be returned to IBM for repair . The cable is not a customer - replaceable unit .
  • Page 31 "Diskette and D i s k Checks . " Defective diskette drive assembly . Replace diskette drive assemb ly . Not e : Make certain of switch drive settings , see IBM Insta l l ing and Fau lt Detection 2 - 16...
  • Page 32 2 . 8 . 2 FA I LU R E TO FUNCTION When a diskette drive fails in operat ion , type SET EC= Y and press return key on the keyboard . Enter DIR*: (the asterisk must be the failed disk drive number .
  • Page 33 MECHAN I C A L FA U L TS I MPO RTANT: DO NOT power - o f f the IBM 9000 whi l e the hard disk drive i s running . I f you do , you may cause unrecoverable loss o f part or a l l of your data on the hard disk .
  • Page 34 Defective disk drive . Replace the disk drive . Note: Make certain o f correct switch drive sett ings . See IBM Instal l ing and Naming Disk Drives Manual, GC 22-9 26 5 . Fault Detect ion 2 - 1 9...
  • Page 35 2 . 9 . 2 FAILURE TO FUNCTION When a disk drive fails in operation , type SET EC= Y and press the return key on the keyboard. Enter D ir the asterisk must be the failed disk drive number . This causes the appropriate fai lure codes to be displayed on the CRT .
  • Page 36 $0072 Disk or Reformat disk and repeat operat ion . planar board I f fault pers ists , perform opt ional See Sect ion 3 . 8, " Diskette check . and Disk Checks . " $0076 Disk or Reformat disk and repeat operat ion . If fau l t pers is t s , perform opt iona l p l anar board See Sect ion 3 .

  • Page 38: Sensor I / O Problems

    If an analog peripheral device is mal functioning, the fault may be in the device in the IBM 9 001 sensor I / O board or in the interconnecting cables . Since analog peripheral devices connected to the IBM 9001 may or may not be products of IBM Instruments, I nc .
  • Page 39 Perform fault isolation procedures suggested by the manufacturer of the peripheral device . If Step 1 does not isolate the fau l t , perform the optional check for the auxil iary I / O port that is connected to the malfunctioning pe­ See Section 3 .

  • Page 40: Optional D Iagnostic , Voltage, And Resistance Checks

    . The optional checks i n this chapter are provided so that you may e l iminate possible causes of a fault or malfunction in the IBM 9 00 1 . By us ing the...

  • Page 41: Power Switch Check

    3 . 3 POWER SWITCH CHEC K The power switch check requires disassembly of the IBM 9001 as far as s tep 4 in Section 5 . 5 . 1 , "Removal. " The diagram fol lowing s hows the power cord ( facing you) and the connector on the power supply.
  • Page 42 3 . 4 VERTICAL BOA RD CHECK These resistance checks verify the proper functioning of the vertical board inst a l l ed in the printer/p lotter cover assemb l y . See Figure 3 - lA and Figure 3 - lB . To perform these checks , dis connect the ribbon cab l e from 1 2 and measure the res istance between the points indicated in this chart .

  • Page 43: Diagram - Vertical Board Check

    J2 - 4 Jl - 2 Take measurement , LEDS J2 - 3 Jl - 3 Take measurement , LEDS J 2 - 8 J l - 5 1 5 0 Take measurement resistance +5 VOLT ON L I N E O N L �W5% SW 1...

  • Page 44: Power Supp Ly Check

    Check the fuse on the rear of the processor unit . Replace i f b l own . Remove the covers on the IBM 9 00 1 . See Sect ion 5 . 1 , "Covers . " Loosen the DC connectors (P 4 and PS ) on the rear of the power supply . .
  • Page 45 Reseat the AC connector (Pl ) . 14 . I f vo ltages in Step 1 1 are verif ied , replace the power supply . Re­ assemble the IBM 900 1 . Optional Diagnostic , Voltage , and Resistance Checks 3 - 6...

  • Page 46: Keyboard Checks

    : Reset the IBM 9 0 0 1 by switching the computer to OFF and back to O N . Press the STOP softkey while the automat ic diagnost ic testing running .

  • Page 47: Keyboard

    Test Mode L E D Test Complete L E D DDDDDDDDD000000 � DDDDDDDOODmm00000 m m ooooooooom�mmoooo Keypad Test Printer Loop Stop Clear Exec Control High Test Control Softkeys Loop Test Subtest Control Stop Printer Control Lower Limit Execute Memory Upper Limit Keyboard Figure 3 - 2 .

  • Page 49: Keypad And Softkey Checks

    To cal l for the keypad and softkey echo test on the keyboard and to perform the test : Reset the IBM 9001 by switching the computer to "OFF" and back t o "O N . Wait at least until automatic diagnost ic Test 4 is running and press the ESC key .
  • Page 50 CRT . End the test b y either resett ing the IBM 9001 o r by press ing the E S C Y ou may return to the operating system label b y typing FE and key .
  • Page 51 Any other diagnos tic commands that need to be entered must be done on the keypad and so ftkey assembly . Keypad Softk�ys Keypad and Softkey Codes F igure 3-4 . 3 . 7 . 2 SOFTKEY R E S I STANCE CHECK To verify that the softkeys are functioning properly , use table to check for continuity between the fol lowing points on the CRT disp l ay cable (JllOO ) when the corresponding softkey is press ed .
  • Page 52 . Test 1 7 , using the wrap cables provided with the IBM 9 0 0 1 , isolates the p l anar board or cabling as a pos s ib l e source of a diskette fault .

  • Page 53: Keypad And Softkey Echo Test - - Test 1

    TESTS A N D 13 The hard disk drive is connected to the IBM 9 0 0 1 through the ports on the hard disk cont ro l l er board . Test 13 checks the funct ioning of the hard To c a l l for the test , see notes is Section 3 .

  • Page 54: And 2 0 - 2 3

    5 - 1 /4f' D I SKETTE A N D D I SKETTE D R I V E TESTS - - TESTS 1 7 A N D 20-23 The 5-!" diskette dr ive is connected to the IBM 9 0 0 1 either at the S-!" Floppy Disk Control port on the processor unit back p late or through the CRT display cable to the port behind the disp lay - mounted diskette drive .

  • Page 55: Crt Controller Test - - Test

    To cal l for and per form the CRT Contro l ler test using the printer in p l ace of the CRT: Reset the IBM 9 001 by switching the computer to OFF and back to ON . Wait at least unt il automatic diagnostic Test 4 is running and pres s Wait unit Test Comp lete LE D lights .

  • Page 56: Sensor I / O Board Test - - Test 3

    Test 3 5 locates a fault on the sensor I / O board and locates faulty oper ­ ation o f the sensor I/O board caused by a mal function on other subassem­ b l ies of the IBM 9 0 0 1 . I f test 35 fails , you shou ld perform the feature board checks .

  • Page 57: Sensor Board

    3 . 1 1 FEATURE BOARD C H E C K S All of the feature boards in the IBM 9001 are interconnected through a common bus in the expansion board , and they a l l use a common power supply distributed through the expansion board .
  • Page 58 I f this check shows a 5 - Volt supply at less than 4 . 8 Volts , perform the " Feature Board Loading Check" and 3 . 1 1 . 3 , in Sect ions 3 . 1 1 . 2 , checks "...

  • Page 59: Expansion Board

    procedure assumes that the processor unit is fully popu lated . I f you have fewer boards , stop when the last board has been tested . To conduct the feature board loading check : Remove the bottom feature board from the processor unit . Move a l l other feature boards down one s lot .
  • Page 60 00 though 02 and the Paral l e l PPU port . Wrap ca­ b les suppl ied with the IBM 9 001 are required for these tests . 3 . 1 2 . 1 S E R I A L PORTS A N D 02 TESTS - - TESTS l E A N D l F Test lE checks serial port 00 with serial port 02 .
  • Page 61 I f you are entering from the keyboard , type lF and press the Fl key and the F l O key . you are entering from the keypad and softkey assembly, press the 1 and F keypads and press the TEST NUM and EXEC so ftkeys .
  • Page 62 Connect the IEEE/USER PORT WRAP TEST #lC wrap cable to the BUS 00 and PPU ports on the processor unit back plate . C a l l for test lC . See notes in Section 3 . 7 . 1 , "Keypad and Softkey Echo Test - - Test 1 9 .

  • Page 63: Keypad , Printer/Plotter Self Test

    Set the Power On/Off switch to "On . " The Power indicator wi l l l ight and the print head w i l l more to the left . D D D l POWER FAULT ON L I N E D O OL ;...
  • Page 64 I f the test does not work, do the fo l l owing: Loosen the two knurled thumb screws on the processor top cover ; s l ide • the processor top cover toward the back of the processor unit , and remove it .
  • Page 65 3 - 26 Optional D iagnos tic , Voltage , and Resistance Checks...
  • Page 66 This chapter provides information that can assist you in checking the Y ou need the volt - ohm multimeter to replaceable cables in the IBM 9001 . perform these checks . First , visua l ly inspect the cables to determine whether there are any broken wires , frayed or cut insulation, or bent or broken connector pins .
  • Page 67 Origin Dest ination Section Device ! Connector Device I Connector I 4 . 2 Vertical board P/J 500 P/P ctrl board Vertical board Left prntr con P/J 5 1 0 Printer/plotter JS l O Left P /P ctrl board JSOO s ide 4 .

  • Page 69: Cable Diagrams

    CRT DISPLAY SOFTKEY P/Jl 100 PRINTER/ PLOTTER P R I N T E R PLOTTER CONTROL BOARD P/J 700 P/J 400 PRINTER/ PRINTER P/J 8 P R I N T PLOTTER PLANAR CONTROL CONTROL H E A D BOARD SIGNALS BOARD PLANAR P/J 200...
  • Page 70 4 . 1 PLA N A R BOARD - P R I N TER/PLOTTER CONTROL BOARD W I R I N G This chart shows connections between the planar board and the See Figure 4 - 1 for connector pin iden­ printer/plotter control board.
  • Page 71 8 11 CRT Display Printer/Plotter Ctrl Board Planar Board 5 -! " Dsktte Drive P/J P/J P/J P/J P/J Dsktte Dsktte 700 6 00 1 100 1000 Drive Drive 32 - - - - 14 - - - - - - - - - - 14 - - - - - - - - - - 14 - - - 3 0 - - - - - - 25 - - - - - 14 3 3 - - - - 1 6 - - - - - - - - - - 1 6 - - - - - - - - - - 1 6 - - - - - - - - - - - 26 - - - - - 1 6 3 4 - - - - 1 8 - - - - - - - - - - 18 - - - - - - - - - - 18 - - - 3 4 - - - - - - 2 7 - - - - - 1 8 35 - - - - 2 0 - - - - - - - - - - 2 0 - - - - - - - - - - 2 0 - - - 3 6 - - - - - - 28 - - - - - 2 0...
  • Page 72 4 . 2 P R I NT E R/ P LOTTER - P R I N TER/PLOTTER CONTROL BOARD W I R I N G This chart traces interconnections between the printer/plotter and the printer/plotter control board through the two p lug - in r ibbon cables on bottom printer/plott er .
  • Page 73 Printer/Plotter Control Board Printer/Plotter Vertical Board J/P 2 00 J/P 4 00 J/P 5 00 Left Right J/P 2 1 0 J/P 5 10 1 - - - - - - - - - - - - - - - - - - - - - - - - 1 2 - - - - - - - - - - - - - - - - - - - - - - - - 2 - - - - - - - 5 3 - - - - - - - - - - - - - - - - - - - - - - - - 3 4 - - - - - - - - - - - - - - - - - - - - - - - - 4 - - - - - - - 6...
  • Page 74 4 . 3 PLA N A R BOARD - KEYBOARD W I R I N G This chart shows the w1r 1ng from the p lanar board t o the keyboard . Figure 4 - 1 for connector pin ident if icat ion and location . Processor Pin 1 - - - - - - - - - - - 2 2 - - - - - - - - - - - 3...
  • Page 75 4 . 4 R U N/READY B REAK-OUT BOX Connector Terminal PC Board See Figure 4 - 1 . Strip 1 - - - - - - - - - - - - - - - - - - - Shield - - - - - - - - - - - - - - - - - - - - GND 2 - - - - - - - - - - - - - - - - - - - RDY ( + ) LED 3 - - - - - - - - - - - - - - - - - - - RU N ( + ) LED 4 - - - - - - - - - - - - - - - - - - - A l ( +) - - - - - - - - - - - - - - - - - - - - - A l ( +)
  • Page 76 4 . 5 ANALOG B REAK-OUT BOX Connector See Figure 4 - 1 CH 4 CH 2 CH 3 CH 1 1 - - - - - - - - - - - - - - - - 2 2 - - - - - - - - - - - - - - - - 3 3 - - - - - - - - - - - - - - - - 4 4 - - - - - - - - - - - - - - - - 5 5 - - - - - - - - - - - - - - - - 7...
  • Page 77 Connector See Figure 4 - 1 CH 1 CH 3 CH 4 CH 2 3 6 - - - - - - - - - - - - - - - - - - - - - - - - - - - 18 3 7 - - - - - - - - - - - - - - - - - - - - - - - - - - - 19 38 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14 3 9 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15...
  • Page 78 4 . 6 RS-232 B R E A K - O UT BOX Connector See Figure 4 - 1 CH 4 CH 2 CH 3 Timer CH 1 26 - - - - - - - - - - - 1 GND 2 7 - - - - - - - - - - - 3 28 - - - - - - - - - - - 5 2 9 - - - - - - - - - - - 7...
  • Page 79 Connector See Figure 4 - 1 . CH 2 CH 1 CH 3 CH 4 Timer 1 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2 12 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4 13 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6 14 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8...
  • Page 80 4 . 7 D I G I TA L B REAK-OUT BOX Connector See Figure 4 - 1 . CH 2 CH 4 CH 1 CH 3 1 - - - - - - - - - - - - 1 3 2 - - - - - - - - - - - - - - - - - - - - - - - - 2 3 - - - - - - - - - - - - - - - - - - - - - - - - 4 4 - - - - - - - - - - - - - - - - - - - - - - - - 6...
  • Page 81 Connector See Figure 4 - 1 . CH 2 CH 4 CH 1 CH 3 34 - - - - - - - - - - - 6 35 - - - - - - - - - - - 8 36 - - - - - - - - - - - 10 37 - - - - - - - - - - - 12 38 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1...
  • Page 82 5 . 1 . 1 REMOVAL Posit ion the IBM 9 001 power switch to OFF and unplug the main power cord from the wall out let . See Figure 5 - 1 . Remove the main power cord from the processor unit back plate . See Figure 5 - 1 .

  • Page 83: Processor Unit Back P L Ate Connections

    120 Volt Receptacle Fuse Yellow LED 5%'" Floppy Disk Con1rol �--- -- -- Au•1h•rv l/O Porn-- S.11•1 2 Aew1 S."•I 0 S.11•1 1 CRT Connector Keyboard Sprn'9 Ret11n1ng Clips Grounding Stud Cable Figure 5 - 1. Processor Unit Back P l ate Connections Removal and Replacement Procedures 5 - 2...
  • Page 85 Retaining Process o r Main Unit 1/0 Pinet (See Note) Figure 5 - 3 . Processor Unit Back P l ate . N ote : Earl ier processor units included eight s crews on the serial and para l l e l ports mounting the ports to the back p l ate ( I / O pane l ) . Remove the processor unit top cover by loosening the two retaining screws and s l iding the cover toward the rear of the processor unit .

  • Page 86: Processor Unit Top Cover

    .1 1 1 1 1 1 1 1 1 1 1 � Main Unit Process o r Figure 5 - 4 . Processor Unit Top Cover 5 . 1 . 2 R E P LACEMENT Replace the processor unit top cover by sett ing the cover on the unit and s l iding it toward the front of the system .
  • Page 87 , and any other connector that was attached to the IBM 5 - 1 . 900 1 . See Figure Pos i t ion the IBM 9001 power switch to ON and do an operational check of the system . 5 . 2...
  • Page 88 5 . 2 . 1 REMOVAL l<emove the covers . See Section 5 . 1 . 1 , "Remova l . " Dis connect a l l the harnessed connectors and the Sf' diskette con­ nector from the printer/plotter control board . See Figure 5 - 6 . Remove the printer/plotter cont rol board by carefully s l iding it 5 - 7 .
  • Page 89 Power Switch Printer/Plotter Control Board Figure 5 - 7 . Printer/Plotter Control Board 5 . 2 . 2 R E P LACEMENT Carefully s l ide the printer/plotter control board into the processor unit . See Figure 5 - 7 . Be sure it is posit ioned properly .
  • Page 90 . 5 . 3 . 1 REMOVAL Position the IBM 9001 power switch to OFF and unplug the main power cord from the wal l out let . See Figure 5 - 1 . Remove the main power cord and a l l other connectors from the processor unit back p l ate .

  • Page 91: Feature Board

    See Figure 5 - 1 . Plug the main power cord into the wal l ou t l et . IBM 9001 Pos i t i · on the ower switc h to ON d do an operation al check of t e system.
  • Page 92 5 . 4 MEMORY MANAGEMENT UN I T (MMU) The MMU plugs into the expansion board and into a interface assembly in­ stal led on the planar board in p lace of the 6 8000 minicomputer chip . Figure 5 - 38. The MMU must occupy the s lot immediately above the p l anar See Figure 5 -5 .

  • Page 93: Power Supply Connections

    Remove the two cable harness retaining s crews and place the cable harness out of the way toward the front of the processor unit and over the tractor bar . See Figure 5 - 6 . Disconnect the two AC connectors and the two DC connectors from the See Figure 5 - 9 .
  • Page 94 Figure 5 - 10 . Power Supply and AC Line Connector 5 . 5 . 2 REPLACEMENT Reconnect the AC line connector and replace the power supply by gent ly lowering back into position . sure that printer/plotter AC cable is posit ioned under the power supply sup­ port bracket , and that this bracket interlocks with the bracket on the expans ion board.
  • Page 95 Replace the covers . See Section 5 . 1 . 2 , "Rep l acement . " 5 . 6 EXPA N S I O N BOA R D The expansion board i s p lugged into the p lanar board and i s located behind See Figure 5 - 5 .
  • Page 96 DC Connectors P1, P2, P3 DC Connectors Frame Cutout I nsert · Expansion Board 5 - 1 1 . Figure Expansion Board 5 . 6 . 2 REPLACEMENT S lide the expansion board into the processor unit unt i l the expansion board ' s ej ector levers hook onto the s ides of the processor unit frame .
  • Page 97 5 . 7 . 1 REMOVAL Posit ion the IBM 9 001 power switch to OFF . Posit ion the processor unit so that there is at least 1 2 inches o f clearance on the right s ide .
  • Page 98 IJJJJ � Mounting Screws (2. Figure 5 - 12 . Read Only Memory (ROM) Plug - In Drawer 5 . 7 . 2 REPLACEMENT Place the ROM card in the drawer and secure it with the two mount ing screws . See Figure 5 - 1 2 . S l ide the drawer back into the processor unit unt i l firmly seated .
  • Page 99 See Figure 5 - 1 3 B . the board to the processor unit . N ote : I f your IBM 9001 is not equipped with a printer/plotter , the printer/plotter connectors referred to in the next step are not present .

  • Page 100: P L Anar Board Connections (Front)

    CRT Connect ion, Printer/Plotter Connection, J14 Keyped Connection, J15 Figure 1 3 A . P l anar Board Connections (Front) Keybo1rd and Socket Mounting Screws.(3) 514-inch Floppy Disc, J3 Cable Connection, J1 · Figure 1 3B . P lanar Board Connections (Rear) Removal and Repl acement Procedures 5 - 19...
  • Page 101 5 . 8 . 2 REPLACEMENT N ote : If a new planar board is being instal led , remove the ROM card from Remove the current ROM card from the ROM p lug - in drawer the new board. See Sect ion 5 .

  • Page 102: Printer/Plotter Top Cover

    14 . Replace the covers . See Section "Replacement . " 5 . 1 . 2 , 5 . 9 KEYPAD ( P R I NTER/PLOTTER COVER ASSEMBLY) The keypad is located on the top front cover of the printer/plotter . Figure 5 - 14A.
  • Page 103 Electrostatic Discharge Terminal Locking Tab Cable Connection Cable Connection Top Cover Board Connection Circuit Board Printer/Plotter Control Connection Circuit Board Connection P2 Connector Figure 5 - 1 4 B . Keypad and Connections 5 . 9 . 1 REMOVAL Posit ion the power switch to OFF ·and unplug the main power cord from the w a l l out let .
  • Page 104 See Figure 14A . Reconnect the elctrostatic discharge terminal . Reconnect the printer/plotter control connector ( J 2 ) . See Figure 5 - 14B . Reconnect the keypad circuit board connector and press the two re­ taining c l ips on each s ide of the connector back into place . See Figure 5 - 1 1 .

  • Page 105: Processor Unit Cab L E Harness

    At no point in this procedure should you turn the processor CAUTION : unit on its s ide or on its back . Retaining Screw Cable Harness Retaining Bar Plastic Screws Retaining Screw P500 Print Head Connector Figure 5 - 15 . Processor Unit Cab le Harness (Top View) Remove the two printer/plotter thumbwheel mounting screws located See Figure 5 - 1 6 .

  • Page 106: Printer/P Lotter Thumbwheel Mounting Screws

    Process o r Main Frame Figure 5 - 16 . Printer/P lotter Thumbwheel Mounting Screws 1 1 . Remove the printer cable from the left rear of the printer/plotter . See Figure 5 - 18 . 1 2 . Remove the print head cable and motors cable from the right rear o f the printer/p lotter .

  • Page 107: Separating The Printer/Plotter From The Processor Unit

    Printer /Plotter Figure 5 - 17 . Separating the Printer/Plotter from the Processor Unit Remova l and Repl acement Procedures 5 - 2 6...

  • Page 108: Printer/P Lotter And Processor Unit

    (J100) Head Print Figure 5 - 1 8 . Printer/Plotter and Processor Unit (Bottom View) Route the print head cable and motors cable through the r ight rear of the processor unit . See Figure 5 - 1 8 . Replace the print head cab le and motors cab l e on the cable harness retaining bar and ins t a l l the top port ion of the bar with the p lastic s crews .

  • Page 109: P R Inter/Plotter Replacement

    Pri nter/Plotter Assembly Figure 5 - 19 . P r inter/Plotter Replacement Replace thumbwheel mounting screws that secure See Figure 5 - 16 . printer/plotter to the processor unit . Position the cable harness assembly over its mounting holes and s e ­ cure it with the two retaining s crews .

  • Page 110: Parts Ident Ification For Ribbon And Guide Wire Changing

    Parts Ident i f icat ion for Ribbon and Guide Wire Changing 5 . 1 1 . 1 REMOVAL IBM 9 0 0 1 Posit ion the power switch to OFF . Posit ion the On Line/Off Line/Form Set switch on the front panel t o Off Line .
  • Page 111 Push down on the spring - loaded lever (the Ribbon Cartridge Latch) near the r ight s ide of the ribbon cartr idge . This releases cartr idge . S l ide the cartridge about an inch to the r ight . Remove the r ibbon from the ribbon guide on the print head .
  • Page 112 REMOVAL FROM CRT D I S P LAY U N I T Stop a l l diskette activity and remove the diskette . Posit ion the IBM 900 1 power switch to OFF and unplug the main power cord from the wal l out let .
  • Page 113 Dis connect the CRT display cable by pushing back on the spring - loaded retaining c l ips that hold the connector in p l ace dis connecting the grounding c l ip and pul ling the connector away from the processor unit back p l ate .

  • Page 114: St" Diskette Drive

    Signal Connector Diskette Unit Mounting Screws Connectors Figure 5 - 2 1 . St" Diskette Drive 5 . 1 3 . 2 REPLACEMENT Reconnect the two connectors to the diskette drive . Be sure the connectors are seated proper ly . See Figure 5 - 2 1 . Carefully s l ide the diskette drive into the CRT display unit housing See Figure 5 - 2 1 .
  • Page 115 Reconnect the CRT display cable and plug the main power cord into the wall out let . See Figure 5 - 1 . Position the IBM 9001 power switch to ON and do an operational check of the system .
  • Page 116 AC POWER CONNECTOR OUTPUT SIGNAL INPUT SIGNAL CONNECTOR CONNECTOR S i " Diskette Drive Assembly Connections Figure 5 - 22 . Drive Mount ing Screw s F igure S Si" Diskette Drive Assembly Removal and Repl acement Procedures S - 3S...
  • Page 117 5 . 1 3 . 4 REPLACEMENT Place the diskette drive in the housing and s l ide it into position. Secure the diskette drive to the housing with the two screws . Figure 5 - 23 . and 2 for the both diskette drives were removed , repeat Steps s econd diskette driv e .
  • Page 118 Reconnect the power cord and a l l other connectors that were removed from the rear of the diskette drive assembly . See Figure 5 -22 . Posit ion the diskette drive assembly ' s power switch to ON . Insert diskettes and do an operational check of the diskette drive assembly .
  • Page 119 Inst a l l the power supp ly mounting cover and s e cure the cover to the mounting bracket and cirucit board assembly with the four mounting screws . See Figure 5 - 2 4 . S l ide the power connector harness through the notch i n cover ready for connecting to the disk drive ( s ) .
  • Page 120 Careful ly lay the diskette drive assembly on its s ide and remove the See Figures 5 - 25 and 5 - 2 6 . five screws holding its cover in p l ace . TOP COVER 00 0 POWER SWITCH Power POWER...
  • Page 121 I f the bottom diskette drive is to be removed also, repeat steps 7 - 9 . 10 . DISKETTE MOUNTING SCREWS COVER COVER SCREWS Figure 5 - 2 6 . 8 11 Diskette Dr ive Assembly (Bottom View) 5 . 1 4 . 2 R E P LACEMENT Place the diskette drive housing on its side with the installed diskette drive (if any) on the bottom.
  • Page 122 Repl n c c the mounting s crew that secures that diskette drive to the See Figure 5 - 2 6 . hous ing . I f both diskette drives were r emoved , repeat Steps for the other drive . Return the assembly to its upright position and replace the cover by s l iding it back into posit ion .
  • Page 123 MOUNTING SCREWS SCREW AT THIS POWER CONNECTOR SIDE LOCATIO;� Figure 5 - 2 8 . 8 1 1 Diskette Drive Power Supply Cover 5 . 1 4 . 3 POWER S U P PLY REMOVAL Remove the 811 Diskette Drive A s s emb ly . See Section 5 .
  • Page 124 POWER SUPPLY MOUNTING SCREWS 5 - 29 . 8 1 1 Figure Diskette Drive 5. 1 4 . 4 REPLACEMENT Pos ition the circuit board over four mounting s t ando f f s , position J l AC power recept a c l e to the lower left and power receptacle right viewed from the front of the diskette a s s embly .
  • Page 125 Inst .::i l diskette drive .::i s s emb l y . 5 - 1 4 . 2 , See Section "Rep lacement . " GROUND TERMINALS POWER SUPPLY MOUNTING BRACKET POWER SUPPLY CIRCUIT BOARD MOUNTING BRACKET LOCATION FOR COVER MOUNTING SCREWS POWER SUPPLY...
  • Page 126 5 . 1 5 . 1 REMOVAL Stop a l l d i s k activit y . Posit ion the d i s k drive a s s embly ' s power switch to Power OFF . D is connect the power cord and a l l...
  • Page 127 Remove the four s crews secur ing the d i s k drive a s s embly ' s cover . Remove the cover . See Figure 5 - 3 2 . DISK DRIVE MOUNTING SCREWS 12) 1 u u 1 DISK DRIVE MOUNTING SCREWS 12) Figure 5 - 32 .
  • Page 128 DISK D R I V E DISK DRIVE CONNECTORS 5 - 3 3 . Figure Hard Disk Drive Connections 5 . 1 5 . 2 R E P LACEMENT P l ace the disk drive in the housing and s l ide it into pos ition . Secure the disk drive t o the housing with the two s crews .
  • Page 129 5 . 1 5 . 3 POWER S U P PLY REMOVAL Removal of the Si" Hard Disk power supply is the same as removal of the Si" Diskette power supply . See Section S . 13 . S , "Power Supply Removal . " 5 .
  • Page 130 Remove the nut s , wire termina l s , and star washers from the ground terminal studs located b e l ow the processor top flange . See Figure S - 34 . 10 . Lift the fan a s s embly out o f the processor unit it on your work table next to the fan a s s embly to be insta l l ed .

  • Page 131: Rom Plug-In Drawer

    Replace p l anar boar d . See Section 5 . 8 . 2 , "Replacement . " Replace ROM plug-in drawer . See Section 5 . 7 . 2 , "Replacement . " Replace expansion board . See Section 5 . 6 . 2 , "Replacement .
  • Page 132 5 - 3 6 6 8000 See Figures p l ace of the processor chip on the p l anar board . 5 - 3 7 . PROCESSOR CHIP (PIN NO. 1) 68000 5 - 36 . 5 - 3 7 . Figure P l anar Board Figure...
  • Page 133 5 . 1 7 . 2 REPLACEMENT 68000 Posit ion the interface a s s embly over the processor chip socket with the fema l e connector end facing away from the expansion board . Taking care that a l l pins are a l igned with the corresponding hole in the connecto r , s eat the interface a s s embly by press ing down with both thumbs .
  • Page 134 Copies of IBM Instruments, Inc. publications are not stocked at the location to which this f orm is addressed. Please direct any requests f or copies of publications, or for assistance in using your IBM Instruments, Inc. product to your IBM Instruments. Inc. representative or to the IBM Instruments, Inc. of fice serving your locality.
  • Page 135 Reader's Comment Form Please do not staple Fold and Tape First Class Permit Armonk New York Business Reply Mail U.S.A. No postage stamp necessary if mailed in the Postage will be paid by: I BM Instruments, I nc. Dept. 79K P.O.
  • Page 136 GC22-9338 IBM Instruments, Inc. Orchard Park P.O. Box 332 Danbury, Connecticut 06810 P/N 6348975...

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