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NCR PC4i Service Manual

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  • Page 1 PC4i Service Manual...
  • Page 2 All features, functions, and operations described herein may not be marketed by NCR in all parts of the world. In some instances, photo­ graphs are of equipment prototypes. Therefore, before using this docu­ ment, consult your NCR representative or NCR office for information...

  • Page 3: Table Of Contents

    NCR PERSONAL COMPUTER PC i» i SERVICE MANUAL CONTENTS Chapter 1 System Overview NCR Personal Computer Hardware ....Display Unit ........Models .......... Model Numbers ........Tools .......... Alternate Main Processor Board ....Chapter 2 Basic Troubleshooting Level 0 (Pov/er-On) Diagnostics ....
  • Page 4 Chapter 4 Level 1 Diagnostics How to Begin Testing ......Load the Diskette ......Main Menu ........Main Menu Help Screens ......Test Completion Displays ...... Diagnostic Selections ......Run all Tests Once ......Automatic Completion ......Memory (Main Menu Selection 1) ....
  • Page 5 Printer Tests ........ 4-50 Generic Printer Test......4-51 PC Compatible Printer Test ... 4-52 Utilities ........4-53 Videotex Adapter Tests (Main Menu Selection)..4-54 Local Test ........4-55 Remote Test ......... 4-55 Picture Test ......... 4-57 Chapter 5 Level 1 Diagnostic Error Returns Repair Guidelines ......
  • Page 6 Repair Procedure 18 ......5-51 Repair Procedure 19 ......5-52 Repair Procedure 20 ......5-52 Fixed Disk Controller Error Codes....5-53 Repair Procedure 21 ......5-53 Repair Procedure 22 ......5-54 Videotex Error Codes ......5-56 Repair Procedure 23 and 24 ....5-57 Repair Procedure 25 ......
  • Page 7 Oscillator Alignment ......Picture Width ........ Vertical Deflection ......7-10 Video ...........7-11 Cutoff Adjustment ......7-11 Whiteness ........7-12 Sub-Brightness ....... 7-12 Focus ..........7-13 Convergence ........7-13 Convergence Adjustments ...... 7-13 Adjustments for Videotex Monitor 008-0072370 .. 7-15 Adjustments for Videotex Monitor 008-0072196 ..

  • Page 9: Chapter 1 System Overview

    Chapter 1 System Overview NCR PERSONAL COMPUTER HARDWARE The NCR Personal Computer consists of a main Display Unit and a Keyboard. The computer is available in different models, and has a variety of options that can be added to each model. Expansion boards from non-NCR ("third party") manufacturers can be used...
  • Page 10 Plug-in board option expansion slots Fixed disk drive controller plug-in board if the unit includes a fixed disk. Video controller plug-in board. A block diagram of the NCR Personal Computer Hardware is shown in Figure 1-1. Figure 1-1 Hardware Block Diagram...

  • Page 11: Models

    254 mm 107 mm (10.0 in. 4.2 in.) MODELS The NCR Personal Computer is available in various models. The standard internal RAM memory size for all models is 256KB. The models currently available are: A 12-inch monochrome display, 1 flexible...
  • Page 12 Dangerous voltages are present when working on the computer with the cabi­ net removed. ONLY TRAINED ENGINEERS AND NCR TRAINED SER­ VICE PERSONNEL SHOULD ATTEMPT TO WORK ON THE COMPUTER WITH THE CABINET REMOVED AND THE POWER ON.

  • Page 13: Model Numbers

    PCBs, and using the special facilities that are available in NCR workshops. MODEL NUMBERS The model number of the NCR PC i»i is shown on the plate at the back of the unit. The meaning of the model number is shown below:...

  • Page 14: Tools

    120/220 to 240 V. TOOLS A normal set of hand tool for an electronic engineer is sufficient to service the computer. You also need an NCR Alignment Disk. o For 48 TPI Drives - part no. 603-9009167...
  • Page 15 SYSTEM OVERVIEW To enable the execution of the Level 0 Loop Test the following test adapters are available: o Turnaround Keyboard Test Adapter 017-0044311 o TurnaroundParallel/Serial Test Adapter 017-0044320 To allow access to the Card Rack Assembly with power applied, an extension cable can be made locally.

  • Page 16: Alternate Main Processor Board

    SYSTEM OVERVIEW ALTERNATE MAIN PROCESSOR BOARD Since the introduction of the NCR Personal Computer PC4i a new style Main Processor Board, known as "Alternate" Main Processor Board (in this manual sometimes referred to as "Generic" Main Processor Board) has been introduced. Much of the information in this manual applies both to the "Alternate"...
  • Page 17 Chapter 2 Basic Troubleshooting This chapter is intended to help the engineer in either repairing the system, or bringing it to a partially operative state so that the diagnostic diskette may be used for further troubleshooting. Presented here is a structured sequence of operations to follow when either the system is unable to run diagnostics, or the level 0 (power-on) diagnostics fail (see Fig.

  • Page 18: Chapter 2 Basic Troubleshooting

    BASIC TROUBLESHOOTING 8237A DMA controller 8253 Timer 8259A Programmable Interrupt Controller Keyboard Interface STEP ONE POKER ON Power Cords and Switches Ensure that the power cord is plugged into the back of the computer Ensure that the power cord is plugged into a properly grounded wall outlet.

  • Page 19: Memory Test Messages

    BASIC TROUBLESHOOTING Turn ON any currently-attached external devices that were specified to be turned on after the processing unit. Memory Test Messages properly operating system turn-on procedure results in the display of Memory Test on the screen; quickly followed by steps through the increments of memory installed.
  • Page 20 BASIC TROUBLESHOOTING Figure 2-1 Troubleshooting Flowchart b. If there is no display after the tube is warm, a display failure , a power supply failure, or main processor failure is suspected. Proceed to repair or replace as appropriate. Make a check of the power supply voltage before d i s a s s e m b l i n g...
  • Page 21 BASIC TROUBLESHOOTING a turnaround test adapter (refer to "Tools" in Chapter 1) . If display failure is indicated, then review and observe the instructions for installation t he d i s p l a y ( r e f e r C h a p t e r "Removal/Replacement").

  • Page 22: After First Attempt

    BASIC TROUBLESHOOTING If a Memory Error is displayed, go to check for Diagnostics Errors, Step 1 . If this was the first attempt to power up, go to "After First Attempt", Step 1. If this was the second attempt to power up, go to "After Second Attempt", Step 1 .

  • Page 23: After Second Attempt

    BASIC TROUBLESHOOTING Check the AC slow-blow power fuse, located in the power supply. For the available versions the following fuses have been inserted: Monochrome: Color: 6.3 A Videotex: 10. Ensure that the adapter boards edge connectors are correctly seated in the MPB board connector slots.
  • Page 24 BASIC TROUBLESHOOTING Take out any adapter board which interferes with access to the MPB configuration switches (see Chapter 8 "Strapping Information"). Set the configuration switches for the minimum 256 KB memory size (Refer to Chapter 8 for proper switch settings). NOTE If any device is disconnected from the MPB serial port in step above, the serial port...

  • Page 25: Power Supply

    BASIC TROUBLESHOOTING POWER SUPPLY Since without a correctly functioning power supply no part of the system can function, therefore it should always be one of the first areas to be checked. power supply is a sub-assembly assembly. Fig.2-2 shows the power supply connections. Three versions of the power supply are used: for systems with a monochrome CRT for systems with a color CRT...
  • Page 26 BASIC TROUBLESHOOTING F i g u r e 2-2 P o w e r S u pp l y C o n n e c t i o n s (Monochrome systems) (1 of 2) 2-10...
  • Page 27 BASIC TROUBLESHOOTING Figure 2-2 Power Supply Connections (Color Systems) (2 of 2) 2-11...
  • Page 28 BASIC TROUBLESHOOTING Figure 2-3 Troubleshooting Flow Chart PS (1 of 5)* * This troubleshooting flow chart applies to the Power Supply 008-007231 ^ (Color). 2-12...
  • Page 29 BASIC TROUBLESHOOTING Figure 2-3 Troubleshooting Flo* Chart PS (2 of 5] 2-13...
  • Page 30 BASIC TROUBLESHOOTING Figure 2-3 Troubleshooting Flow Chart PS (3 of 5) 2-14...
  • Page 31 BASIC TROUBLESHOOTING Figure 2-3 Troubleshooting Flow Chart PS (4 Of 5} 2-15...
  • Page 32 BASIC TROUBLESHOOTING Figure 2-3 Troubleshooting Flow Chart PS (5 of 5] 2-16...

  • Page 33: Peripherals

    BASIC TROUBLESHOOTING Peripherals Remove all peripherals that may be attached to the NCR Personal Computer, and their interface PC boards. If necessary, reset the configuration switches on the Main Processor Board to match the downgraded system configuration. The pertinent switch configurations are shown in Chapter 8 "Strapping Information".
  • Page 34 BASIC TROUBLESHOOTING b. If any other errors are indicated, go to step 2. c. If the computer has been reconfigured for the purpose of troubleshooting, it is necessary to r e s t o r e m a c h i n e step step full...

  • Page 35: Restore Full Configuration

    BASIC TROUBLESHOOTING board testing each increment separately. in Base Meiory* is 4. If the message'Error displayed, an error in l o w er 128 RAM indicated. This RAM is soldered into the main processor board; therefore, the board should be r e p la ced to assure the p r o b l e m...

  • Page 36: Test Crt And Disk Drives

    BASIC TROUBLESHOOTING If all memory installed in the computer has been sucessfully tested, go to Test CRT And Disk Drives. Increase the amount of memory indicated by the configuration switches by minimum increments and retest by performing the following sequence of actions: Turn OFF the power.
  • Page 37 Restart the test with the disk drive properly loaded by the following steps: Turn the computer power switch OFF Insert a backup copy of an NCR-DOS (or other) operating system diskette into drive A. The problem being diagnosed could destroy data on...
  • Page 38 BASIC TROUBLESHOOTING Observe whether any indication of a problem exists, e.g. an error message on the screen or some other indication of error. At the conclusion of the power-on diagnostics, the operating system should be booted into the computer and the system prompt A>...
  • Page 39 BASIC TROUBLESHOOTING The technique requires reiteration of this and other steps as many times as there are expansion adapter cards or port-connected peripherals. If some action taken during the procedure, such as making connections secure or correcting configuration switch settings, has cleared up the problem(s) which required this effort, the steps of the Check For Diagnostics Errors section will have completed the...
  • Page 40 BASIC TROUBLESHOOTING "Removal/Replacement" for removing and replacing boards, if necessary, for access to switches. Then turn ON the computer again. 2-24...

  • Page 41: Chapter 3 Level 0 Diagnostics

    ROM of the NCR Personal Computer. These diagnostics are initiated before any other activity is attempted each time the computer is turned on. Normal messages and error messages which may be displayed on the screen are shown.
  • Page 42 LEVEL 0 DIAGNOSTICS In normal operation, the upper boundary of the bank of memory tested is displayed in the upper left-hand corner of the screen; at successful completion of the test of each bank, the following screens appear:...
  • Page 43 L E V E L 0 D IA G N O S T IC S...
  • Page 44 LEVEL 0 DIAGNOSTICS NOTE Memory bank3 "Alternate" higher than 256KB are tested, and their upper boundaries displayed, only if the configuration switches (switch 1 and 2 of switch block A, SWA, on the MPB are set to indicate that a higher total amount of memory (640 KB) is present.

  • Page 45: Other Mpb Tests

    LEVEL 0 DIAGNOSTICS OTHER MPB TESTS Other MPB components are tested. These include: The 8088 Central Processing Unit (CPU) IC. The 2764 Erasable-Programmable Read-Only Memory (EPROM) IC. This IC contains the Basic I/O System (BIOS). BIOS has two major sets of components: the power-on diagnostics/initialization routines;...

  • Page 46: Error Returns

    LEVEL 0 DIAGNOSTICS Zeroing of DRAM memory Setting up in DRAM memory the tables and control information (flags, vectors) needed operating system. Loading and (booting) the operative system from d i s k e t t e drive (normally) transferring control to the operating system coding.

  • Page 47: Parallel Port Error Codes

    LEVEL 0 DIAGNOSTICS "Check K ey b o a r d " s e c t i o n c h a p t e r 2 "Basic Troubleshooting". PARALLEL PORT ERROR CODES The power-on diagnostics/initialization routines also issue a set of two character hexadecimal codes to the MPB parallel port.
  • Page 48 LEVEL 0 DIAGNOSTICS *] For PC4i with "Alternate" MPB installed only.
  • Page 49 LEVEL 0 DIAGNOSTICS Fig. 3-1 Error Messages on Screen and LEDs (2 of 6]...
  • Page 50 LEVEL 0 DIAGNOSTICS Fig. 3-1 Error Messages on Screen and LEDs [3 of B] 3-10...
  • Page 51 LEVEL 0 DIAGNOSTICS Fig. 3-1 Error Messages on Screen and LEDs (4 of 6) 3-11...
  • Page 52 LEVEL 0 DIAGNOSTICS Fig. 3-1 Error Messages on Screen and LEDs [5 of 6) 3-12...
  • Page 53 LEVEL 0 DIAGNOSTICS Fig. 3-1 Error Messages on Screen and LEDs (6 of 6) The error codes shown in Fig. 3-1 are valid for the ROM BIOS 3.5 (150-0002348) only. This ROM BIOS can also be contained in the early-type MPB.
  • Page 54 LEVEL 0 DIAGNOSTICS ERROR MESSAGES OF THE EAHLIER-TYPE MPB * If a ROM.BIO 2.3 version 017-00xxxxx is concerned the Level 0 Loop mode is running when: 1. S1 on switch block is in ON position (refer to Chapter 8 "Strapping Information") 2.

  • Page 55: Suggested Action

    LEVEL 0 DIAGNOSTICS SUGGESTED ACTIOH For some of the error conditions which can occur d u r i n g the a u t o m a t i c r u n n i n g of the p o w e r - o n diagnostics routines, the indication has been given in this ch ap te r to go to the T r o u b l e s h o o t i n g...
  • Page 56 LEVEL 0 DIAGNOSTICS The Troubleshooting Nonoperative generic systems chapter gives detailed instructions for removing add­ on memory and/or other devices to return the computer to the original status, then for restoring machine to full configuration one step at a time. This procedure can isolate problems to a specific device.
  • Page 57 Follow the instructions in the "Cabinet" and "MPB" sections of Chapter 6 "Removal/Replacement". When the MPB has been removed, it can be taken to an NCR service facility or NCR-authorized dealer for repair or replacement. (Repair of the MPB can be successfully done only by a...

  • Page 59: Chapter 4 Level 1 Diagnostics

    These diagnostics, also referred to as Level 1 Diagnostics, are the most comprehensive set of test routines supplied and supported by the NCR PERSONAL COMPUTER Model 4i. Following the instructions in this chapter, the field engineer or technician interacts with SERVICE DIAGNOSTICS...

  • Page 60: Main Menu

    Chapter H LEVEL 1 DIAGNOSTICS NOTE Use a back-up copy of the diskette included in the manual; the possibility exists that a problem with the computer could destroy the data on the disk. Turn the drive access lever clockwise to enable the drive.
  • Page 61 LEVEL 1 DIAGNOSTICS Run Utilities (Press <F6>) View Main Menu HELP screen (Press <F1>) Initiate A Continuous Test Run (Press menu item number and <F8>) The following diagram illustrates the structure of the diagnostic system: Fig. 4-1 Diagnostic Structure Diagram The screens shown in this chapter may vary slightly depending on the version of diagnostics being used.
  • Page 62 LEVEL 1 DIAGNOSTICS Page 2 of the Main Menu, containing items 9 to 11, is accessed by pressing the <PgDn> key. All highlighted tests except HIGH SPEED (XP) are available for your system.

  • Page 63: Main Menu Help Screens

    LEVEL 1 DIAGNOSTICS To add/delete tests to/from the Main Menu, press the <F9> key. If the <F7> key is pressed, each test (1 through 11) listed on the menu is automatically run in sequence, starting with the memory test. The test, for any device (fixed disk, color/graphics display, etc.) which is found by the diagnostic routines not to be present, is skipped.

  • Page 64: Test Completion Displays

    LEVEL 1 DIAGNOSTICS TEST COMPLETION DISPLAYS When a test is completed, the diagnostics routines display either a PASSED message detailed coded error message. Chapter 5 Level 1 Diagnostics Error Returns, explains all of the possible error messages the suggested action to take for each.
  • Page 65 Examples of completion displays are: S u c c e s s fu l Com pletion In the example shown, the RAM Address test, one of the memory tests included in selection 1 of the menu has run and that part of the memory has passed the test procedures.

  • Page 66: Diagnostic Selections

    LEVEL 1 DIAGNOSTICS Unsuccessful Completion In this example, flexible drive B failed the Write test, part of the Flexible Disk Drive test (selection 4 of the main menu). It failed because the flexible disk controller (FDC) failed to respond. The major error codes (03 = flexible disk drive write error) and detail error codes (80 = FDC failed to respond), and the abbreviations and values on the next...

  • Page 67: Run All Tests Once

    LEVEL 1 DIAGNOSTICS RUN ALL TESTS ONCE (FUNCTION KEY <F7>) When the <F7> key is pressed from the main menu screen, the separate tests for specific devices (selections 1 through 11) are automatically run in sequence. test device (fixed disk, color/graphics display, etc.) which is determined by the diagnostic routines to be not present is skipped.
  • Page 68 Upon completion the messages appear as shown in the sample screen below. In this sample, both keyboard and the monochrome display failed in some aspect, and because there is no color display, there is no message for that menu selection. To see a record of any errors detected, select the utilities function (F6 key) and then select Error Log Maintenance ("3").

  • Page 69: Memory (Main Menu Selection 1)

    LEVEL 1 DIAGNOSTICS MEMORY (MAIN MENU SELECTION 1) When selection number ”1" is chosen from the main m e n u screen, the M e m o r y tests m en u s creen is displayed: Each of the five available tests is selected by entering the corresponding number (1 through 5).

  • Page 70: Memory Test Help Screens

    LEVEL 1 DIAGNOSTICS Memory Test HELP Screen To obtain more information about the available memory tests, press <F1> to see the HELP screen: BAM Pattern Test If selection 1 of the Memory test menu is chosen, the RAM pattern test is run. The name of the test is displayed while the test is in progress:...

  • Page 71: Ram Address Test

    LEVEL 1 DIAGNOSTICS Upon completion of the test, either the PASSED message or an ERROR message is added to the display. Refer to Chapter 10 of this manual for a description of error messages and recommended corrective actions. RAM Address Test If selection 2 of the Memory test menu is chosen, the RAM Parity test is run.

  • Page 72: Ram Parity Test

    LEVEL 1 DIAGNOSTICS RAM Parity Test If selection 3 of the Memory test menu is chosen, the Firmware Checksum test is run. The name of the test is displayed while the test is in progress: Upon completion of the test, either the PASSED message or an ERROR message is added to the display.

  • Page 73: Ram Walking Ones Test

    LEVEL 1 DIAGNOSTICS RAM Walking Ones Test If Selection 4 of the Memory Test Menu is selected, the RAM Walking Ones Test is run. ROTE This test can only be run, after the three preceding RAM tests have been completed. Otherwise a warning is displayed.

  • Page 74: Firmware Checksum Test

    LEVEL 1 DIAGNOSTICS FIRMWARE Checksum Test If selection 5 of the Memory test menu is chosen, the Firmware Checksum test is run. The name of the test is displayed while the test is in progress: Upon completion of the test, either PASSED message or an ERROR message is added to the display.

  • Page 75: Controllers (Main Menu Selection 2)

    LEVEL 1 DIAGNOSTICS CONTROLLERS (CIRCUIT DEVICES) (MAIN MENU SELECTION 2) When selection number "2" is chosen from the main menu screen, the Controllers test menu screen is displayed: Each nine available controller tests is selected by entering the corresponding number, through 9- If the F8 key is pressed after the number for a specific test is selected, that test is run continuously until <F4>...

  • Page 76: Controllers Test Help Screens

    LEVEL 1 DIAGNOSTICS Controllers Test HELP Screen To obtain more information about the available tests of the various Main Processor Board (MPB) and adapter card controller chips, press F1 to see the HELP screens: CPU Test If selection 1 of the Controllers test menu is chosen, the CPU test is run.

  • Page 77: Dma Test

    LEVEL 1 DIAGNOSTICS Upon completion of the test, either the PASSED message or an ERROR message is added to the display. Refer to Chapter 5 of this manual for a description of error messages and recommended corrective actions. DMA Test If selection 2 of the Controllers test menu is chosen, the DMA Controller test is run.

  • Page 78: Flexible Disk Controller Test

    LEVEL 1 DIAGNOSTICS Flexible Disk Controller Test If selection 3 of the Controllers test menu is chosen, the Flexible Disk Controller test is run. The name of the test is displayed as the test is in progress. Upon completion of the test, either the PASSED message or an ERROR...

  • Page 79: Interval Timer Test

    LEVEL 1 DIAGNOSTICS Interval Timer Test If selection 4 of the Controllers test menu is chosen, the Interval Timer test is run. The name of the test is displayed while the test is in progress. Upon completion of the test, either the PASSED message or an ERROR message is added to the display.

  • Page 80: Interrupt Controller Test

    LEVEL 1 DIAGNOSTICS Interrupt Controller Test If selection 5 of the Controllers test menu is chosen, the Interrupt Controller test is run. The name of the test is displayed while the test is in progress. Upon completion of the test, either the PASSED message or an ERROR message is added to the display.

  • Page 81: Cpu Controller Test

    LEVEL 1 DIAGNOSTICS CPU Controller Test If selection 6 of the Controllers test menu is chosen, the CPU Controller test is run. The name of the test is displayed while the test is in progress. Upon completion of the test, either the PASSED message or an ERROR message is addedto the dcisplay.

  • Page 82: Monochrome Display Controller Test

    LEVEL 1 DIAGNOSTICS Monochrome Display Controller Test If selection 7 of the Controllers test menu is chosen, the Monochrome Display Controller test is run, if the p r o g r a m senses the pre sen ce of a monochrome display adapter.

  • Page 83: Color Graphics Display Controller Test

    LEVEL 1 DIAGNOSTICS Color/Graphies Display Controller Test If selection 8 of the Controllers test menu is chosen, the Color/Graphics Display Controller test is run, if the p r o g r a m senses the pr e se n c e of a color/graphics display adapter.

  • Page 84: Keyboard (Main Menu Selection 3)

    LEVEL 1 DIAGNOSTICS Serial Asynchronous Communications Controller Test If selection 9 of the Controllers test menu is chosen, Serial Asynchronous Communications Controller test is run. The name of the test is run. The name of the test is displayed while the test is in progress.
  • Page 85 LEVEL 1 DIAGNOSTICS any other keys have been pressed or not, pressing these two causes another message to be displayed. After all keys have been pressed, followed by the <F1>/<F10> entry, the display is similar to the screen shown: An entry nYB indicates a successful completion of the test and a message, PASSED, will...

  • Page 86: Flexible Disk Drive (Main Menu Selection 4)

    LEVEL 1 DIAGNOSTICS FLEXIBLE DISK DRIVE (HAIN M ENU SELECTION When selection number n4n is chosen from the main menu screen, the Flexible Disk Drive test menu screen is displayed: Each of the eight available tests is selected by entering the corresponding number (1 through 8). If the <F8>...

  • Page 87: Read Only Drive A Test

    LEVEL 1 DIAGNOSTICS Read Only Drive A Test If selection 1 of the Flexible Disk Drive test menu is chosen, the Read Only test is run on drive A. The name of the test is displayed while the test is in progress: Upon completion of the test, either...

  • Page 88: Read/Write Drive A Test

    LEVEL 1 DIAGNOSTICS Read/Write Drive A Test If selection 5 of the Flexible Disk Drive test menu is chosen, the Read/Write test is run on drive A: CAUTION The flexible disk diagnostics tests are destructive to data on any diskette other than the diagnostics diskette.

  • Page 89: Fixed Disk Drive (Main Menu Selection 5)

    LEVEL 1 DIAGNOSTICS Other Flexible Disk Drives The selection of other tests on the Flexible Disk Drive menu causes the test selected to run in the same manner as the tests for Drive A. The messages are the same in all cases. FIXED DISK DRIVE (MAIN MENU SELECTION 5) When selection number "5"...

  • Page 90: Fixed Disk Drive Test Help Screen

    LEVEL 1 DIAGNOSTICS Fixed Disk Drive Test HELP Screen To obtain more information about the available fixed disk drive tests, press<F1>to see the HELP screen: Read/Write Maintenance Track If selection 1 of the Fixed Disk Drive test menu is chosen the Read/Write Maintenance Track test is run. The name of the test is displayed while the test is in progress: 4-32...

  • Page 91: Read Only Sector 0

    LEVEL 1 DIAGNOSTICS Upon completion of the test, either the PASSED message or an ERROR message is added to the display. Refer to Chapter 5 of this manual for a description of error messages and recommended corrective actions. Read Only Sector 0 If selection 2 of the Fixed Disk Drive test menu is chosen, the Read Only Sector 0 test is run: Upon completion of the test,...

  • Page 92: Read Only Entire Disk

    LEVEL 1 DIAGNOSTICS Read Only Entire Disk If selection 3 of the Fixed Disk Drive test menu is chosen. First a screen is displayed where you are requested enter the number of fixed disk to test. After selecting the number of the drive to be tested the Read Only Disk test is run: In the above display, the drive number is 00 for the...

  • Page 93: Read/Write Entire Disk

    LEVEL 1 DIAGNOSTICS each head is increased by increments of 1 from 0000 to maximum track number (depending on whether 10MB or 20MB) then is reset to 0000 for the next head. The sector number is increased by increments of 1 from 01 to 17 for each track.
  • Page 94 LEVEL 1 DIAGNOSTICS In the following screen you are requested to enter the number of the fixed disk to be tested. When "any" key is pressed again, the write pass of the test begins. The information displayed is almost identical to the Read Only Entire Disk test; the main difference is that the Function WRITE is indicated: 4-36...
  • Page 95 LEVEL 1 DIAGNOSTICS In the above display, the drive number is 00 for the first integrated fixed disk drive or for the first external fixed disk drive if no integrated drive is present. Head number is increased by increments of 1 from 00 to 03 as the test proceeds.

  • Page 96: Fixed Disk Controller

    LEVEL 1 DIAGNOSTICS Upon completion of the test, either the PASSED message or an ERROR message is added to the display. Refer to Chapter 5 of this manual for a description of error messages and recommended corrective actions. Fixed Disk Controller When selection 5 of the Fixed Disk Drive test menu is chosen, the Fixed Disk Controller test screen is...

  • Page 97: Monochrome Display (Main Menu Selection 6)

    LEVEL 1 DIAGNOSTICS MONOCHROME DISPLAY (MAIN MENU SELECTION 6) When selection number n6n is chosen from the main menu screen, the Monochrome Display test runs by briefly displaying the test name as it tests the controller: 4-39...
  • Page 98 LEVEL 1 DIAGNOSTICS 4-40...

  • Page 99: Color/Graphics Display (Main Menu Selection 7)

    LEVEL 1 DIAGNOSTICS COLOR/GRAPHICS DISPLAY (MAIN MENÜ SELECTION 7) When selection number "7n is chosen from the main menu screen, the Color/Graphics Display test begins by briefly displaying the test name as it tests the controller: Then, without stopping, the test displays this screen: 4-41...
  • Page 100 LEVEL 1 DIAGNOSTICS Again without stopping, the test displays this screen asking for verification of the attributes shown: If "N" is entered, an ERROR message is displayed and c h o i c e s i m i l a r t h o s e d e s c r i b e d "...
  • Page 101 LEVEL 1 DIAGNOSTICS BH° is entered, an ERROR message is displayed as before. If BY" is entered, the next screen is displayed: If BH° is entered, an ERROR message is displayed as b e f o r e . If BY B is e n t e r e d , n e x t s c r e e n displayed:...
  • Page 102 LEVEL 1 DIAGNOSTICS If "N" is entered, an ERROR message is displayed as before. If " Y n is e n t e r e d , the n e x t s c r e e n displayed: If "N" is entered, an ERROR message is displayed as before.
  • Page 103 LEVEL 1 DIAGNOSTICS If "N" is entered, an ERROR message is displayed as before. If "Y" is entered, the next scree n is H i o n ! a v e H • If "N" is entered, an ERROR message is displayed as before.
  • Page 104 LEVEL 1 DIAGNOSTICS If "N" is entered, an ERROR m e ss age is displayed as b ef o re . If " Yw is e n t e r e d , t he n e x t s c r e e n displayed: If WNW is entered, the Color/Graphics Display test has been successfully completed and the programn...
  • Page 105 LEVEL 1 DIAGNOSTICS I f <F4>is pressed, an ERROR message is displayed as before. The PASSED message is displayed upon successful completion of all the tests. Refer to Chapter 5 of this manual for a description or error messages and recommended corrective actiuons.

  • Page 106: Serial Port Loopback Test

    LEVEL 1 DIAGNOSTICS Serial Port Loopback Test (Peripherals Menu Line 1) W h e n s e l e c t i o n n u m b e r n 1n is cho s en f rom peripherals menu, the Serial Port Loopback test is performed.

  • Page 107: Parallel Port Loopback Test

    LEVEL 1 DIAGNOSTICS Upon completion of the test, either the PASSED message or an ERROR message is added to the display. Refer to Chapter 5 of this manual for a description of error messages and recommended corrective actions. Parallel Port Loopback Test (Peripherals Menu Line 2) W h e n s e l e c t i o n n u m b e r "2"...

  • Page 108: Printer Tests

    LEVEL 1 DIAGNOSTICS Upon completion of the test, either the PASSED message is added to the display. Refer to Chapter 10 of this manual for a description of error messages and recommended corrective actiions. Printer Tests NOTE These tests are for a printer attached to the printer (parallel) port of the computer.

  • Page 109: Generic Printer Test

    LEVEL 1 DIAGNOSTICS When <F2l> is pressed, the program returns to the peripherals menu. Generic Printer Test If selection "3" of the Peripherals test menu is chosen, the Generic Printer test is run. The name of the test is displayed while the test is in progress: Upon completion of the test, either the PASSED message or an ERROR message is added to the display.

  • Page 110: Pc Compatible Printer Test

    LEVEL 1 DIAGNOSTICS PC Compatible Printer Test If selection of the Peripherals menu is chosen, the PC Compatible Printer test is run. The name of the test is displayed while the test is in progress: Upon completion of the test, either the PASSED message or an ERROR message is added to the display.

  • Page 111: Utilities

    LEVEL 1 DIAGNOSTICS UTILITIES (MAIN M ENU F KEY) When the <F6> key is pressed from the-'main menu screen, the menu screen for the Utility functions available on the diagnostics diskette is displayed: The Utilities Menu explains the function of each of the possible utilities that can be selected by typing the corresponding number and pressing the ENTER key.

  • Page 112: Videotex Adapter Tests (Main Menu Selection)

    LEVEL 1 DIAGNOSTICS VIDEOTEX (BTX) ADAPTER TESTS (Main Menu Selection 11) This test routine enables testing of the functional characteristics of - the modem and video long player (VLP) interfaces (local loop test) - the modem and VLP interfaces for remote operation (remote loop test) - EUROM memory/controllers (test pictures) When selection "11"...

  • Page 113: Local Test

    LEVEL 1 DIAGNOSTICS Local Test If selection "1” of the Videotex (BTX) test menu is chosen, the Local Test is run , the following screen is displayed: Remote Test If selection 1 of the Videotext (BTX) test menu is chosen the following screen is displayed: 4-55...
  • Page 114 LEVEL 1 DIAGNOSTICS Re m o t e t e s t i n g is based on the c o m p a r i s o n of characters. As seen on the screen displayed the test only carried using d i ffere nt...

  • Page 115: Picture Test

    LEVEL 1 DIAGNOSTICS Picture Test If selection "4" in the Test Menu is chosen, test screen No.1 testing the character and attribute memory is displayed. Test Screen No.1- Testing the character and attribute memory screen consists of w h i t e letters ("U") displayed on a red background;...
  • Page 116 LEVEL 1 DIAGNOSTICS Test Screen No. 4 - Inverse DRCS Character Test A bar pattern is displayed on the screen. The bars are blue and red. border color is half­ intensity white. Errors: irregularities in the pattern other colors Press any key to continue. Test Screen No.

  • Page 117: Repair Guidelines

    Level 1 Diagnostics Error Returns This chapter provides information needed to diagnose and repair the NCR PERSONAL COMPUTER Model PC 4i. is not the intent of this manual to educate the user in all aspects of computer operation. The material...

  • Page 118: Preliminary Checks

    LEVEL 1 DIAGNOSTICS ERROR RETURNS connectors and outlets. One fixed disk drive installed in the computer housing. Up to two flexible disk drives installed in the computer housing. Fixed disk controller board. Controller board for a video display, either color or monochrome, and the cables to connect the unit.

  • Page 119: Main Processor Board Components

    Figure 5-1 shows the placement of all the major components used by the NCR Personal Computer on the Alternate (Generic) Main Processor Board, whereas Fig. 5-2 shows the major components on the Early-type...
  • Page 120 ,EVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-1 Alternate* Main Processor Board * Also called "Generic" 5- 4...

  • Page 121: Memory Addressing

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-2 Early-type Main Processor Board MEMORY ADDRESSING When using the diagnostic diskette, it is helpful to understand the method of memory addressing used by the 8088 microprocessor. The 8088 divides memory up into segments allocates bytes each...
  • Page 122 LEVEL 1 DIAGNOSTICS ERROR RETURNS construct the physical memory address it is necessary to place 0 to the right of the last digit in the segment base and add the offset value to form the 20 bit address. Figure 5-4 shows how the example in Figure 5-3 is converted to a 20 bit address.
  • Page 123 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-5 Memory Segment Locations for the Alternated) and Early-type MPB (2)

  • Page 124: Error Codes

    LEVEL 1 DIAGNOSTICS ERROR RETURNS ERROR CODES This section describes the error reports from the NCR Personal Computer SERVICE DIAGNOSTICS program. The reports from the diagnostics are in coded form. This reduces the large overhead of program code required for text.
  • Page 125 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-6 MPB Component Identification for Alternate (1) and Early-type MPB (2)

  • Page 126: Format Of Displayed Error Codes

    LEVEL 1 DIAGNOSTICS ERROR RETURNS FORMAT OF DISPLAYED ERROR CODES FILENAME: MAJOR CODE: DETAIL CODE DATE TIME ADDITIONAL MESSAGE Examples: FLEX:02:80Date Time This code represents: MAJOR: An error was returned while attempting to read a flexible disk drive. DETAIL: FDC failed to respond, Time out on FDC. NOTE: FDC is an abbreviation, used frequently in this chapter, for Flexible Disk Controller.
  • Page 127 LEVEL 1 DIAGNOSTICS ERROR RETURNS CODE DESCRIPTION Flexible Disk Drive Error Codes: FLEX:01 FDC RESET ERROR FLEX:OS FDC READ ERROR FLEX:03 FDC WRITE ERROR FLEX:04 FDC VERIFY ERROR FLEX:05 FDC FORMAT ERROR FLEX:06 FDC DATA ERROR FLEX:07 FDC RESET ERROR Keyboard Error Code: KEYBRD:01 KEYBOARD ERROR...

  • Page 128: Memory Error Codes

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-7 Mejor Error Codes (3 of 3] DETAIL ERROR CODES AND REPAIR PROCEDURES Not every MAJOR error code will have associated DETAIL codes. The remainder of this chapter lists the MAJOR codes in sequence, followed by the DETAIL codes (if any) associated with each MAJOR code or group of MAJOR codes, followed by the recommended "Repair Procedures".

  • Page 129: Repair Procedure 01

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Detail code: Parity error interrupt Base RAM parity error Expansion RAM error These codes are logically nor"ed to present final detail code. Example: Parity error & interrupt from the base RAM Parity detected from expansion RAM with no interrupt.
  • Page 130 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-8 RAM Memory IC Loactions for Alternate MPB 5-14...
  • Page 131 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-9 RAM Memory IC Location for Early-type MPB. Figure 5-10 RAM Memory IC Locations on Expansion Board 5-15...
  • Page 132 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-11 MPB Memory IC Locations for Alternate MPB Figure 5-12 MPB Memory IC Locations for Early type MPB 5-16...
  • Page 133 LEVEL 1 DIAGNOSTICS ERROR RETURNS To check errors reported on the Memory Expander Board remove the expander board and set the configuration switches for the maximum memory on the MPB. If the system passes the parity check, the problem is on the Memory Expander Board and diagnostics can proceed (with the expander board reinstalled) as described above.

  • Page 134: Repair Procedure 02

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Repair Procedure 02 The RAM PATTERN TEST writes data patterns into memory and then reads the patterns back to verify that all the data bits in memory are functioning properly. This test will detect the presence of stuck data bits in a RAM or an intermittent bus driver.
  • Page 135 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-13 RAH Memory Components for Alternate MPB 5-19...

  • Page 136: Repair Procedure 03

    LEV EL 1 D IA G N O S T IC S ERRO R R E T U R N S RAM ADDRESS ERROR TEST Format of code: JffiM0RY:03:ww Date Time ADDR: ssss:oooo EXP DATA: xxxx, OBS DATA: yyyy Where, Detail code for DETAIL 01, Segement of expected address...

  • Page 137: Repair Procedure 05

    LEVEL 1 DIAGNOSTICS ERROR RETURNS RIM WALKING ONES TEST Format of code: MEMORY: 05:00 ADDR; ssss:oooo EXP DATA: xxxx, OBS DATA:yyyy Where, Detail code Segment address of error ssss = oooo = Offset address of error xsxx = Expected data yyyy = Observed Detail Code:...
  • Page 138 LEVEL 1 DIAGNOSTICS ERROR RETURNS ROM test still report a checksum error the problem probably exists in an intermittent address or data bus component that connects the ROM to the 8088 microprocessor. Figure 5-15 ROM Hardware Components for Alternate MPB 5-22...

  • Page 139: Flexible Disk Drive Error Codes

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-16 ROM Hardware Components for Early-type MPB FLEXIBLE DISK DRIVE ERROR CODES FLEXIBLE DISK DRIVE ERRORS, FLEX:01 to 07 (Refer to Figure 5-7) Format of code: FLEX:aa:ww, Date Time EXP DATA: xx, OBS DATA: yy = Major code = Detail code = Optional expected data...
  • Page 140 LEVEL 1 DIAGNOSTICS ERROR RETURNS NOTE: The EXP DATA and OBS DATA fields are dis­ played onmajor code FLEX:06 only. Detail code: The following detail codes apply to major codes FLEX :01 through 05 and FLEX :07. Disk drive not ready FDC failed to respond Seek operation failure FDC failure...

  • Page 141: Repair Procedure 06

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Repair Procedure 06 Failure in the Flexible Disk Drive system can be particularly hard to troubleshoot and repair. There is a general approach for solving disk drive problems that is applicable to most failures. Treatment of certain types of failures will follow the specified detail code.
  • Page 142 LEVEL 1 DIAGNOSTICS ERROR RETURNS 5-26...
  • Page 143 A. Figure 5-19 shows in detail t he•header jumper and other strapping blocks found on the disk drive (refer to Figure 5-18 for location). The NCR Personal Computer requires that two straps to be installed.
  • Page 144 LEVEL 1 DIAGNOSTICS ERROR RETURNS To configure a different flexible disk drive to be drive A, remove the strap from DS1 and reinstall on DSO. Remove the strap from DSO on drive A; this will prevent addressing conflicts. NOTE: Do not install two disk drives that are both s t r apped as s yst em drive...
  • Page 145 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-20 Ribbon Cable Termination Figure 5-21 Flexible Disk Related Hardware. Alternate MPB 5-29...
  • Page 146 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-22 Flexible Disk Related Hardware; Early-type MPB For more detailed information on troubleshooting the Flexible Disk Drive s u b a s s e m b l y , refer to the specific detail code that was reported by system diagnostics.
  • Page 147 LEVEL 1 DIAGNOSTICS ERROR RETURNS DETAIL CODE 20 See device code 80. DETAIL CODE 10 Suspect disk drive unit out of alignment or defective. Perform data read/write test on alternate Flexible Disk Drive (if installed) to verify condition. If both drives fail CRC check t h e n s u s p e c t f l e x i b l e...

  • Page 148: Keyboard Error Codes

    LEVEL 1 DIAGNOSTICS ERROR RETURNS DETAIL CODE 01 Software error. Reboot system and perform test again. Suspect bad diagnostics program disk. KEYBOARD ERROR CODES KEYBOARD ERROR TEST Format of code: ERROR:01:ww Date Time EXP DATA:xx, DATA: yy Where, ww = Detail code xx = Expected data from keyboard port yy = Observed data from keyboard port Detail codes:...
  • Page 149 LEVEL 1 DIAGNOSTICS ERROR RETURNS defective. Figures 5-23 and 5-24, respectively, shows the main processor board components that comprises the keyboard interrupt signal path. DETAIL CODES 03 and 04 These codes indicate internal keyboard failure of the CPU controller. Check inputs to U7 (U125) and proper operation of the keybaord clock.
  • Page 150 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-2U Keyboard Related Hardware^ Early-type MPB VIDEO DISPLAT ERROR CODES CRT ERROR TEST Format of code: M0N0:01:ww Date Time EXP DATA: xx, OBS DATA: yy COLOR :01: ww Date Time EXP DATA: xx, OBS DATA: yy Where, ww = Detail code xx = Expected data from register...

  • Page 151: Repair Procedure 08

    LEVEL 1 DIAGNOSTICS ERROR RETURNS yy = Observed data from register DETAIL code: Monochrome crtc register access error Monochrome crtc cursor error Monochrome crtc character set error Monochrome crtc attribute error Monochrome crtc scroll error Color crtc register access error Color crtc cursor error Color crtc 80x25 character set error Color crtc attribute error...
  • Page 152 LEVEL 1 DIAGNOSTICS ERROR RETURNS If no error messages are generated, the data path to expansion slot is functional. If the video display is operational, but the display does not stabilize, perform the necessary adjustments to the video display unit. WARNING The video display adapter/controller board contains HIGH VOLTAGE elements.

  • Page 153: Repair Procedure 09

    LEVEL 1 DIAGNOSTICS ERROR RETURNS ADDR: ssss: oooo, EXP DATA: xxxx, OBS DATA: yyyy Where, = Detail code ssss = Segment address of error 0000 = Offset address of error xxxx = Expected data yyyy = Observed data Detail codes: Monochrome pattern error Monochrome address error Color pattern error...

  • Page 154: Peripheral Error Codes

    LEVEL 1 DIAGNOSTICS ERROR RETURNS PERIPHERAL ERROR CODES SERIAL COMMUNICATIONS ERROR TEST Format of code: PERIPH:01:ww Date Time EXP DATA :xxf OBS DATA: yy Where, ww = Detail code xx = Optional expected data yy = Optional observed data NOTE: EXP DATA and OBS DATA are in reference to the registers in error.

  • Page 156: Repair Procedure 10

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-26 Serial Communications Status (2 of 2) Repair Procedure 10 Before starting to troubleshoot the communications channel r e c o m m e n d e d that sy s t e m configuration switches may be checked for the proper setting.
  • Page 157 LEVEL 1 DIAGNOSTICS ERROR RETURNS port (J2) and diagnostics check run on the printer. If the printer fails the problem is probably an intermittent bus driver on the data bus. This test can be used since both printer and serial port use the data bus.
  • Page 158 LEVEL 1 DIAGNOSTICS ERROR RETURNS (U12) (pin 8) to determine if the interrupt signal is operational (refer to Figures 5-26 and 5-27, respectively) Serial Communications Port Hardware Figure 5-28 for Alternate MPB Figure 5-29 Serial Communications Port Hardware? Early-type MPB 5-42...

  • Page 159: Repair Procedure 11

    LEVEL 1 DIAGNOSTICS ERROR RETURNS PRINTER (PARALLEL) PORT ERROR TEST Format of code: PERIPH:02:ww Date Time EXP DATA: xx, OBS DATA: yy Where, ww = Detail code xx = Expected data yy = Observed data Detail code: Printer data port error Printer control port error Printer status port error No interrupt on printer port...
  • Page 160 LEVEL 1 DIAGNOSTICS ERROR RETURNS DETAIL CODE 01 printer data path defective diagnostics test w it h loop back c o n n ec t o r installed will show the failure (invalid data) in the EXP DATA and OBS DATA fields. For valid data the expected and observed fields will be the same.
  • Page 161 LEVEL 1 DIAGNOSTICS ERROR RETURNS Figure 5-32 Printer Port Hardware Components Early-type MPB To check the integrity of the data bus used communicate with printer port a loop back connector can be placed on the RS 232 SERIAL PORT (J10) and diagnostics performed on the serial port. If the serial port also fails the diagnostics test the p r o b l e m is a bad b ipo l a r...

  • Page 162: Repair Procedure 12

    LEVEL 1 DIAGNOSTICS ERROR RETURNS ((PIO, (U46)) through line driver (U47) and data latch U69 (U56) to the printer port. Refer to Detail Code 01. DETAIL CODE 04 Susp e c t Interrupt o p e r a t i o n a l interrupt controller ((8259, U25 (U132)).

  • Page 163: Repair Procedure 13

    LEVEL 1 DIAGNOSTICS ERHOB RETURNS CAUTION Care should be used in removing any socketted IC component or damage to the component/socket may result. CPU ERROR (8088) Format of code: CONTROL :01:00 Date Time Detail code: NONE Repair Procedure Check the 8088 U6 (U125) for correct installation. Determine if the ready line of U6 (U125) is active;...

  • Page 164: Repair Procedure 14

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Where, ww = Detail code = Expected data from register = Observed data from regiser Detail code: Failed read/write to mask register Repair Procedure 14 Check the bus connections to the 8259 Interrupt Controller IC. DETAIL CODE 10 Suspect 8259 (U25XU132*) data bus to processor...

  • Page 165: Repair Procedure 16

    LEVEL 1 DIAGNOSTICS ERROR RETURNS IC U30 (U120). Recommend check of the B data bus for proper operation. DETAIL CODE 2x, 3xf 5x Check the clock inputs to the 8253 U30 (U120) Suspect divide by 2 flip flop and the timer chip DMA CONTROLLER (8237) TEST Format of code: for Detail 1x...

  • Page 166: Repair Procedure 17

    LEVEL 1 DIAGNOSTICS ERROR RETURNS DETAIL CODE 70 DMA failed addressing test. Evaluate the and OBS DATA fields to determine if the address failed along an eight bit address path. If the lower address bus (bits 0 - 7 ) has been altered then suspect...
  • Page 167 LEVEL 1 DIAGNOSTICS ERROR RETURNS failure. A failure detected by using this technique can isolate which line on the PIO is failing. Check CPU Controller. SERIAL PORT (8250) TEST FAILED LINE CONTROL REGISTER READ/WRITE TEST Format of code: CONTROL:06:ww Date Time EXP DATA: xx, OBS DATA: yy...
  • Page 168 LEVEL 1 DIAGNOSTICS ERROR RETURNS Where, ww = DETAIL code xx = Expected data fro® register yy = Observed data from register Detail code: No ready status from controller Bad status returned after invalid conmmand sent Incorrect STATUS 0 returned from controller after invalid command sent Repair Procedure 19 Suspect defective flexible disk drive controller...

  • Page 169: Repair Procedure 18

    LEVEL 1 DIAGNOSTICS ERROR RETURNS Refer to "Repair Procedure 08" for more information on troubleshooting Video (CRT) systems. FIXED DISK CONTROLLER ERROR CODES FIXED DISK CONTROLLER ERROR TEST (ON EXPANSION BOARD) Format of code: FIXED:01:ww Date Time HEAD TRACK SECTOR CYCLE xxxx X X X X...

  • Page 170: Repair Procedure 21

    LEVEL 1 DIAGNOSTICS ERROR RETURNS S o m e e rror con d i t i o n s c o r r e c t e d reformatting the fixed disk. If the fixed disk drive is reformatted all data previously stored on the drive is lost.
  • Page 171 LEVEL 1 DIAGNOSTICS ERROR RETURNS operation of the main processor board bus signals insert another controller card (CRT, memory expander) in the expansion slot occupied by the fixed disk controller card and perform diagnostics tests for the newly installed card. If the diagnostics tests pass then the problem resides on the fixed disk controller card or the fixed disk drive subassembly.

  • Page 172: Videotex Error Codes

    DETAIL CODE 11 Refer to DETAIL CODE OB. DETAIL CODE 20 The fixed disk controller card failed while the d i a g n o s t i c s w e r e t e s t i n g the drive unit.

  • Page 173: Repair Procedure 23 And 24

    Repair Procedure 23 and If detail codes 01 and 02 are returned, the Videotex controller board is defective. A new board must be installed. Repair Procedure Check for the installation of the Turnaround Test Plug (Part No. 017-0044311). If the error persists, a new Videotex controller board must be installed.

  • Page 175: Chapter 6 Removal/Replacement

    Chapter 6 Removal/Replacement This chapter describes how to remove and replace the major assemblies of the NCR Personal Computer PC 4i. The description includes all assemblies that are used the computer, therefore be sure that the correct procedure is used since not all features are in every system.
  • Page 176 RE M O V AL/RE PLA CE M E N T Remove the two retaining screws (B). Slide the cabinet top backwards and upwards. To re-assemble, the above procedure in the reverse order. CARD RACK ASSEMBLY To remove the card rack assembly, refer to Figure 6-2 and use the following procedure.
  • Page 177 REMOVAL/REPLACEMENT Turn the securing screw a quarter turn counter-clockwise. Pull out the card rack assembly. NOTE The cable connecting the disk drives to the card rack assembly is long enough to a llow c o m p l e t e w i t h d r a w a l a s s e m b l y fu rthe r...

  • Page 178: Printed Circuit Boards

    REMO VA L/REPLACEMENT NOTE The ribbon cable is color coded on the lower edge, be sure that the connectors to the disk drives are reconnected the correct way. When adding option boards to a system the following limitations must be considered: A maximum of seven boards may be installed into the card rack assembly.

  • Page 179: Main Processor Board

    REMOVAL/REPLACEMENT Figure 6-3 Option Board Removal Main Processor Board To remove the main processor board, remove all option PCBs, and use the following procedure. This procedure applies to both versions, to the Alternate and Early- type MPB as well. Remove the 5 screws and lift off the metal cover (A) as shown in Figure 6-^.
  • Page 180 REMOVAL/REPLACEMENT Early-type MPB: Disconnect Flexible Disk Drive connector from P12 DisconnectSerial/Parallel connector from P13 * marked on MPB Figure 5-4 Main Board Cover Removal Remove the two screws fastening the MPB to the rack. Unscrew the power connector (A) on the top right of the MPB, see Figure 6-5.

  • Page 181: Disk Drives

    REMO VAL/REP LACEMENT To replace the main processor board, use the above procedure in the reverse order. Figure 6-5 Board Removal DISK DRIVES To remove the disk drives, first remove the cabinet and card rack assembly, refer to Figure 6-6 and use the following procedure:...
  • Page 182 REMOVAL/REPLACEMENT If you have not already done so, disconnect the broad ribbon cable (A) from the disk drive (two cables on fixed disk drives). Figure 6-6 Disk Drive Removal Disconnect the power cable (B) from the disk drive. Remove the knurled screw (C). Remove the two screws (D) from the top of the disk drive.

  • Page 183: On/Off Switch

    REMO VAL/R EP LACEMENT NOTE: U nless disk drive s t r a p p i n g changed, flexible disk drives are not interchangeable. Always replace the drive into the original location. If a replacement disk drive is being installed then this must be strapped correctly, refer to the Chapter 8 "Strappings".

  • Page 184: Brightness And Volume Controls

    REMOVAL/REPLACEMENT Figure 6-7 ON/OFF Switch Removal BRIGHTNESS AND VOLUME CONTROLS To remove either the Brightness or Volume controls, remove the cabinet and card rack assembly, use the following procedure: Be sure that the ON/OFF switch is in the OFF p o s i t i o n , a n d t h a t p o w e r...

  • Page 185: Complete Assembly

    EEMOVAL/EEPLACEMENT To replace the control knob, use the above procedure in the reverse order. Ensure that the wires are soldered onto the correct terminals. Figure 6-8 CRT Control Removal MONOCHROME CRT/POWER SUPPLY ASSEMBLY This part of the computer may removed complete assembly (CRT and power supply), or the power supply may be removed separately.

  • Page 186: Power Supply

    REMOVAL/REPLACEMENT re-assemble complete assembly into computer, use the above procedure in the reverse order. Figure 6-9 Monochrome CRT/Power Supply Removal POWER SUPPLY The power supply may be removed from the CRT assembly either after the CRT assembly has been removed from the computer, or while it is still in the computer.
  • Page 187 REMOVAL/REPLACEMENT Figure 6-10 Monochrome Power Supply Removal Disconnect all connectors (A) from the left side of the power supply board. Remove the two screws (B) and disconnect the Ground wire (C). Slide the power supply board towards the back of the CRT assembly and lift out.

  • Page 188: Monochrome Deflection Board

    REMOVAL/REPLACEMENT MONOCHROME DEFLECTION BOARD WARNING Very high voltages are present when the unit is operating. Before removing the CRT High Tension lead, the CRT tube should be discharged by connecting a 1 megohm resistor between the high tension connector and ground for a minimum of ten seconds, see Figure 6-11.
  • Page 189 REMOVAL/REPLACEMENT Disconnect the high tension lead (A) from the back of the CRT tube. Disconnect all connectors (B) from the deflection board. Push the plastic clips (C) out of the frame, remove, and lift out the deflection board. Remove small PCB from rear of CRT. Figure 6-12 Monochrome Deflection Board Removal replace...

  • Page 190: Monochrome Crt

    REMOVAL/REPLACEMENT To remove the CRT, remove the cabinet, discharge the CRT tube, use the following procedure: Remove the complete CRT/Power Supply assembly. Disconnect the connector (A) from the deflection board, see Figure 6— 13- Figure 6-13 Monochrome CRT Removal Disconnect the high tension lead (B) from the back of the CRT tube.

  • Page 191: Color Crt/Power Supply A S S Y

    REMOVAL/REPLACEMENT COLOR CRT/POWER SUPPLY ASSEMBLY To remove this assembly, remove the cabinet, and use the following procedure: Disconnect the three connectors (A) from the left side of the power supply board (Figure 6-14) . Disconnect the CRT cable (A) from the back of the card rack assembly, see Figure 6-15) Figure 6-14 Color CRT/Power Supply Removal...

  • Page 192: Power Supply

    REMOVAL/REPLACEMENT To re-assemble complete assembly into the computer, use the above procedure in the reverse order. POWER SUPPLY To remove the power supply, it is first necessary to remove the complete CRT/Power Supply assembly. Then, C refer to Figure 6-16, and use the f o l l o w i n g procedure:...

  • Page 193: Color Deflection Board

    REMOVAL/REPLACEMENT Figure 6-16 Color Power Supply Removal To replace the power supply, use the above procedure in the reverse order. COLOR DEFLECTION BOARD WARNING Very high voltages are present when the unit is operating. Before removing the CRT High Tension lead, the CRT tube should be discharged by connecting a 1 megohm resistor between the high...
  • Page 194 REMO VAL/REPLA CEMENT Figure 6-17 Color Deflection Board Removal Remove the screw (C) from the lower right corner of the deflection board. The deflection board is protected by a shielding grid which is attached by means of three screws. Remove the two screws (D) from the bracket that secures the deflection board to the frame.
  • Page 195 REMOVAL/EEPLACEMENT Figure 6-18 Color Deflection Board Removal COLOB CRT WARNING Very high voltages are present when the unit is operating. Before removing the CRT High Tension lead, the CRT tube should be d i s c h a r g e d by c o n n e c t i n g 1 m e g o h m resistor between the high tension connector...
  • Page 196 REMOVAL/REPLACEMENT Disconnect the high tension lead from the back of the CRT tube. Break the adhesive bond (A) from the end of the CRT tube and the small PCB, disconnect the small PCB from the end of the CRT tube. Disconnect the single wire B from the back of the small PCB.
  • Page 197 Chapter 7 Adjustments MONOCHROME CRT The "Utilities" part of the Level 1 Diagnostics Disk contains a " Monochrome Alignment" phase. The screens provided in this phase can be used to help in adjusting the monochrome and color CRT display. The positions of the adjustment controls are shown in Figure 7 -1.

  • Page 198: Chapter 7 Adjustments

    ADJUSTMENTS WARNING Very high voltages are present when the unit is operating. Although these voltages carry low current, extreme care should be used when performing adjustments when the unit is operating. All adjustments should be made w i t h pl as ti c a d j u s t i n g tools.

  • Page 199: Display Out Of Focus

    ADJUSTMENTS DISPLAY OUT OF FOCUS Adjust focus trimmer (A). DISPLAY TOO DIM Adjust brightness trimmer (B).

  • Page 200: Display Rolls

    ADJUSTMENTS DISPLAY ROLLS Turn trimmer (C) until display stops rolling, next turn trimmer in the opposite direction display just starts to roll in the opposite direction, now set the trimmer to the mid-point of these two positions. DISPLAY TOO SHORT/LONG Adjust height trimmer (D), "Character Field Size".

  • Page 201: Display Not Linear

    ADJUSTMENTS DISPLAY NOT LINEAR Adjust linearity trimmer (E). Adjust coil (F), see "Character Field Size". DISPLAY TILTED Loosen the locking screw (G) and rotate the yoke (H) assembly, tighten the locking screw, see Figure 7-1.

  • Page 202: Character Field Size

    ADJUSTMENTS CHARACTER FIELD SIZE Figure 7-3 Character Field Size With all adjustments correctly set, a full screen display of 25 lines each with 80 characters, occupies an area of 222 ram (8.7 in.) by 167 m m (6.6 in.), centered on the CRT screen as shown in Figure 7-3. COLOR CRT NOTE Before carrying out these adjustments,...
  • Page 203 ADJUSTMENTS For any trimmer adjustments use only plastic tools. WARNING Very high voltages are present when the unit is operating. Before removing the CRT High T e n s i o n lead, tube should be discharged by connecting a 1 megohm resistor between high tension...

  • Page 204: Horizontal Deflection

    ADJUSTMENTS Figure 7—4 High-Voltage Discharge HORIZONTAL DEFLECTION OSCILLATOR ALIGNMENT To enter the Color Alignment Utility proceed as previously described, then select "3", "4" and <F4> to obtain an all white picture to begin your adjustments (refer to Figure 7—5). Turn H HOLD (VR502 in a clockwise direction until you see changes (overlapping) on the right edge of the white picture.

  • Page 205: Picture Width

    ADJUSTMENTS PICTURE WIDTH Having obtained the Color Alignment Utility select "1" to obtain an all white test grid. Then begin your adjustments (refer to Figure 7-5). Adjust H WIDTH (L552) until the width of the picture is 217mm +/-4mm (8.5in. +/-0.16in.). NOTE: This coil reaches extremely high operating temperatures.

  • Page 206: Vertical Deflection

    ADJUSTMENTS VERTICAL DEFLECTION OSCILLATOR ALIGNMENT To enter the Color Alignment Utility proceed as previously described, then select "3”, "4" and <F4> to obtain an all white picture to begin your adjustments (refer to Figure 7-5). Turn the V HOLD (VR 401) counterclockwise until the picture starts to roll.

  • Page 207: Video

    ADJUSTMENTS VIDEO CUTOFF ADJUSTMENT To enter the Color Alignment Utility proceed as previously described, then select "3”» "4" and <F4> to obtain an all white picture to begin your adjustments (refer to Figure 7-6). Figure 7-6 Video Adapter Board Adjustments Turn VR6B1(blue),VR6G1(green), VR6R1(red), and SCREEN fully counterclockwise.

  • Page 208: Whiteness

    ADJUSTMENTS Adjust the two remaining color potentiometers until all colors have the same intensity produce a white line. 10. Set the Service switch to the normal position (mid- position). 11. Turn external brightness control to maximum. 12. Adjust SCREEN clockwise until the background is j u s t v i s i b l e , t h e n...

  • Page 209: Focus

    ADJUSTMENTS Set meter to 1mA range and connect meter between Testpoints 1Z - 9Z. Turn "External Brightness" Contrast (VR202) control to maximum. Slowly turn Sub-Brightness (VR201) until the current is 400 microamperes. FOCUS Display a full screen (25 lines, 80 characters per line) of H's, and refer to Figure 7-10.
  • Page 210 ADJUSTMENTS To obtain a violet grid pattern, select n 3", "4" and <F4> in the Color Alignment Utility and refer to Figure 7-6. Loosen magnet lock ring. Adjust D12 so that the red and blue vertical lines are superimposed on each other (violet lines).
  • Page 211 ADJUSTMENTS To obtain a white grid pattern on screen select "3", "2" and <F4> in the Alignment Utility. Adjust e6 so that the vertical violet and green lines are superimposed on each other (white vertical lines). Adjust f9 and e5 together so that the horizontal violet and green lines are superimposed on each other (white horizontal lines).
  • Page 212 ADJUSTMENTS FOCÜS Bring brightness and contrast to maximum. Adjust VR 109» potentiometer for focus to optimal line focus. Pay attention to border contrast. DISPLAY GEOMETRY Use VR 303 for vertical, VR 301 for horizontal shift, VR 305 for height control, VR 306 for width control, VR 307 (o/w correction) for both display contours.
  • Page 213 ADJUSTMENTS focus at max. brightness and contrast. FBAS CHANNEL-R1. Load videotex test program and switch on FBAS channel via keyboard. Connect FBAS signal to socket. Check display geometry and display quality. If necessary, slightly adjust. VIDEOTEX MONITOR (BTX) 008-0072370 a d j u s t m e n t s f o r Figure 7-8 Adjustment Points 7-17...

  • Page 214: Adjustments For Videotex Monitor 008-0072370

    ADJUSTMENTS ADJUSTMENTS FOR VIDEOTEX MONITOR (BTX) 008-0072196 GENERAL 1. Pre-adjust the chassis 2. Perform only the adjustments here described 3. Do not change all other adjustments. TOOL AND TEST PROGRAM Flexible disk with Service Diagnostic Test Program, HF adjustment tool. TEST PREPARATIONS Please don't readjust any potentiometer or coil not described in the present procedure.
  • Page 215 ADJUSTMENTS green line faintly brightens. Adjust VR 652 and VR 653> VR 6R2, VR 6B2 so that the lines becomes white. Cancel S651 and switch RGB signal on. Adjust VR 6R3 and VR 6B3 so that the raster becomes 6550 degrees K + 7 M.P.C.D white. CONTRAST Turn external Contrast and Brightness potentiometer in maximum position.

  • Page 217: Chapter 8 Strapping Information

    Chapter 8 Strapping Information This chapter provides strapping information for the various PCBs used in the NCR Personal Computer ^i. MAIN PROCESSOR BOARD Your NCR Personal Computer 4i may be provided either with an Early-type MPB or Alternate MPB also called "generic", because this board can also be installed...

  • Page 218: Switch Settings

    - Parallel port Switch 5 - HIPO feature Switches 6, 7 and 8 - not used on the PC4i. Switch Settings To set either switch S W 1 or SWA, it is necessary to pull out the card rack assembly, see Figure 8-2.
  • Page 219 S T R A P P IN G IN F O R M A T IO N Figure 8-2 Locations of Switches Depending on how many option boards are installed, it may also be necessaey to temporarily remove some of these boards.
  • Page 220 STRAPPING INFORMATION The settings for the switches block SW1 are shown in Figure 8-4. Figure 8-4 SW1 Switch Positions 8 - 4...
  • Page 221 STRAPPING INFORMATION The settings for switch block SWA are shown in Figure Figure 8-5 SWA Switch Positions...

  • Page 222: Jumper Settings

    STRAPPING INFORMATION JUMPER SETTINGS JUMPERS FUNCTION JP-1 Power good jumper I.Open when no popwer good signal is available from power supply. 2. Closed when power supply has a power good signal JUMPER FUNCTION JP-2 Factory set, has to remain in closed position Factory set, has to remain in closed JP-3...
  • Page 223 STRAPPING INFORMATION EARLY-TYPE HAIR PROCESSOR BOARD If your system does not contain an Alternate Main Processor Board either an Early-type MPB (1} or Early-type MPB (2) may have been installed into the system. Both main processor boards have one switch block and several jumpers on board.
  • Page 224 STRAPPING INFORMATION SWITCH CONFIGURATIONS OF EARLY-TYPE MAINBOARDS Figure 8-7 Switch Positions (Early-Type MPB1)
  • Page 225 STRAPPING INFORMATION Figure 8-8 Switch Positions (Early-Type MPB2) Some systems are delivered with a different strapping on the MPB. On these systems the strap J/P 5 is replaced by three straps - J/P1, J/P2, and J/P3. Flexible Disk Drives Enabled - J/P 1 Closed Serial Port Enabled...

  • Page 226: Memory Expansion Board

    STRAPPING INFORMATION SWITCHING CONFIGURATIONS OF PCBs MEMORY EXPANSION BOARD Figure 8-9 Switch Position on Memory Expansion Board 8-10...

  • Page 227: Alpha Display Adapter

    STRAPPING INFOMATION ALPHA DISPLAY ADAPTER Figure 8-10 Location of Jumpers 8-11...

  • Page 228: Graphic Controller Boards

    STRAPPING INFORMATION GRAPHIC CONTROLLER BOARD Set J1 open for color CRT and set J1 closed for monochrome CRT. For jumper location and language selection see figure below: Strapping for Graphic Controller Board 017-0044063: Figure 8-11 Locations of Jumpers 8-12...

  • Page 229: In-House Dlc Adapter

    STRAPPING INFORMATION Strappings for Graphic Controller Board 017-0043980 Figure 8-12 Locations of Jumpers IN-HOUSE DLC ADAPTER The Jumpers W1 and W2 are usrd to select Interrupt Request lines as shown below: Jumper Selection A - B A - B Interrupt Vector 11 IRQ3 B - C B - C...

  • Page 230: Videotex Adapter Board

    STRAPPING INFORMATION VIDEOTEX ADAPTER BOARD Before installing these boards ensure that strapping is set correctly as shown in the following tables: Strappings for Videotex Adapter Board 017-0040364C 8-14...
  • Page 231 STRAPPING INFORMATION Strappings for Videotex Adapter Board 017-0044050 8-15...

  • Page 232: Flexible Disk Controller Board 1.2Mb

    STRAPPING INFOMRATION Figure 8-14 Location of Jumpers FLEXIBLE DISK CONTROLLER BOARD 1.2MB Figure 8-15 Locations of Jumpers 8 - 1 6...

  • Page 233: Hard Disk Controller Boards

    STRAPPING INFOMRATION HARD DISK CONTROLLER BOARDS The following Controller Boards are available: 008-0072640: Figure 8-16 Location of switches 8-17...
  • Page 234 STRAPPING INFOMRATION 008-0072641: Figure 8-17 Location of switches Switch Settings: Jumper Block Description 8-18...
  • Page 235 STRAPPING INFOMRATION 008-0072642: Figure 8-18 Location of Switches Switch Settings: 8-19...

  • Page 236: Flexible Disk Drive Jumpers

    STRAPPING INFORMATION Legend: 0 = Jumper = Switch closed 1 = No Jumper = Switch open Two jumpers must be set on the Jumper block SW1 see Figure below. Figure 8 - 1 9 Jumper Block FLEXIBLE DISK DRIVE JUMPERS The flexible disk drives of the system are selected by connecting a jumper between certain contacts of the header jumper.
  • Page 237 STRAPPING INFORMATION F i g u r e 8— 20 J u m p e r He a d er Configurations for Flexible Disk Drives 8-21...
  • Page 239 A P P E N D IX A LAYOUT AND SCHEMATICS CONTENTS Early-type Main Processor Board .... Alternate Main Processor Board ....A-16 Wiring Diagram ......... A-31 Graphics Controller Board ..... A-34 Alpha Controller Board ......A-40 Flexible Disk Drive ......A-45 Flexible Disk Drive 1.2 MB .....
  • Page 241 E a r l y - t y p e H a i n P r o c e s s o r B o a r d 4 - 2...

  • Page 242: Early-Type Main Processor Board

    LAYOUTS AND SCHEMATICS [1 of 14] E a r L y - t y p e Main P r o c e s s o r B o a r d...
  • Page 243 LAYOUTS AND SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d (2 of 14) A -3...
  • Page 244 LAYOUTS AND SCHEMATICS [3 of 14) Ea r l y-ty pe Main P r o c e s s o r B o a r d A -4...
  • Page 245 LAYOUTS A W SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d [4 of 14)
  • Page 246 LAYOUTS A W SCHEMATICS E a r l y - t y p e Ma in P r o c e s s o r B o a r d f 5 of 14) A -6...
  • Page 247 LAYOUTS AND SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d [6 of 14] A -7...
  • Page 248 LAYOUTS AND SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d (7 of 14) A -8...
  • Page 249 LAYOUTS AND SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d [8 of 14) A -9...
  • Page 250 LAYOUTS AND SCHEMATICS E a r l y - t y p e Ma in P r o c e s s o r B o a r d [9 of 14) A ~ 1 0...
  • Page 251 LAYOUTS A W SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d (10 of 14] A - l l...
  • Page 252 LAYOUTS AND SCHEMATICS E a r L y - t y p e M a i n P r o c e s s o r B o a r d of 14] A -1 2...
  • Page 253 LAYOUTS AND SCHEMATICS (12 of 14) E s r L y - t y p e M a i n P r o c e s s o r B o a r d A - 1 S...
  • Page 254 LAYOUTS AND SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d (13 of 14) A -1 4...
  • Page 255 LAYOUTS AND SCHEMATICS E a r l y - t y p e M a i n P r o c e s s o r B o a r d [14 of 14) A -1 5...
  • Page 256 LAYOUTS A W SCHEMATICS A l t e r n a t e M a i n P r o c e s s o r B o ar d A -1 6...
  • Page 257 LAYOUTS AND SCHEMATICS LOGIC DIAGRAMS A l t e r n a t e P r o c e s s o r M a i n b o a r d (1 of 14) A -1 7...
  • Page 258 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e P r o c e s s o r M a i n b o a r d (S of 14] A -1 8...
  • Page 259 LAYOUTS A W SCHEMATICS Logic Diagram A l t e r n a t e M a i n P r o c e s s o r B o a r d [3 of 14] A -1 9...
  • Page 260 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e Ma in P r o c e s s o r B o a r d (4 of 14) A -2 0...
  • Page 261 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e M a i n P r o c e s s o r B o a r d (5 of 14) A -2 1...

  • Page 262: Alternate Main Processor Board

    LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e M a i n P r o c e s s o r B o a r d (6 of 14) A -2 2...
  • Page 263 LAYOUTS AND SCHEMATICS Logic Diagram P r o c e s s o r B o a r d [7 of 14) A l t e r n a t e M a i n A -2 3...
  • Page 264 LAYOUTS AUD SCHEMATICS Logic Diagram (6 of 14] A l t e r n a t e Main P ro ces so r B o a r d A -2 4...
  • Page 265 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e M a i n P r o c e s s o r B o a r d (9 of 14) A -2 5...
  • Page 266 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e M a in P r o c e s s o r B o a r d (10 of 14) A -2 6...
  • Page 267 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e M a i n P r o c e s s o r B o a r d (11 of 14] A -0.7...
  • Page 268 TAYOUTS A W SCHEMATICS Logic Diagram A l t e r n a t e Main P r o c e s s o r B o a r d (12 of 14] A-28...
  • Page 269 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e M a i n P r o c e s s o r B o a r d (13 of 14]...
  • Page 270 LAYOUTS AND SCHEMATICS Logic Diagram A l t e r n a t e M a i n P r o c e s s o r B o a r d (14 of 14) A - S O...

  • Page 271: Wiring Diagram

    LAYOUTS AND SCHEMATICS W i r i n g D i a g r a m W i r i n g D i a g r a m (1 of 3] /-.¾ 7...
  • Page 272 LAYOUTS AND SCHEMATICS {2 of 3] W i r i n g D i a g r a m A -3 2...
  • Page 273 LAYOUTS AND SCHEMATICS W i r i n g D i a g r a m [3 of 3] A - Z...
  • Page 274 LAYOUTS AND SCHEMATICS C o n t r o l l e r B o a r d 6 r B p h i C 8...
  • Page 275 LAYOUTS AND SCHEMATICS G r a p h i c s C o n t r o l l e r B o a r d (1 of 5)
  • Page 276 LAYOUTS AND SCHEMATICS G r a p h i c s C o n t r o l l e r B o a r d (2 of 5) A-56...

  • Page 277: Graphics Controller Board

    LAYOUTS AND SCHEMATICS G r a p h i c s C o n t r o l l e r B o a r d [3 of 5)
  • Page 278 LAYOUTS AND SCHEMATICS G r a p h i c s C o n t r o l l e r B o a r d [4 of 5) A-38...
  • Page 279 LAYOUTS AND SCHEMATICS (5 of 5) G r a p h i c s C o n t r o l l e r B o a r d A -Z Q...
  • Page 280 LAYOUTS AND SCHEMATICS A l p h a C o n t r o l l e r B o a r d A-40...
  • Page 281 LAYOUTS AND SCHEMATICS A l p h a C o n t r o l l e r B o a r d [1 of 4]...
  • Page 282 LAYOUTS A W SCHEMATICS A l p h a C o n t r o l l e r B o a r d (2 of 4) A-42...
  • Page 283 LAYOUTS AND SCHEMATICS A l p h a C o n t r o l l e r B o a r d (3 of 4)

  • Page 284: Alpha Controller Board

    LAYOUTS AND SCHEMATICS A l p h a C o n t r o l l e r B o a r d (4 of 4] A-44...
  • Page 285 LAYOUTS AND SCHEMATICS F l e x i b l e D i s k D r i v e F l e x i b l e D i s k D r i v e (1 of 8) A -4 5...
  • Page 286 LAYOUTS AND SCHEMATICS F l e x i b l e D i s k D r i v e [2 of 8] A-46...
  • Page 287 LAYOUTS AHD SCHEMATICS [3 of BJ F l e x i b l e D i c k D r i v e A-47...

  • Page 288: Flexible Disk Drive

    LAYOUTS AND SCHEMATICS [4 of 8) F l e x i b L e D i s k D r i v e A-48...
  • Page 289 LAYOUTS AND SCHEMATICS F l e x i b l e D i s k D r i v e (5 of 8] A-49...
  • Page 290 LAYOUTS A W SCHEMATICS F L e x i b L e D i ß k D r i v e (6 of 8) A-50...
  • Page 291 LAYOUTS A W SCHEMATICS F l e x i b l e D i s k D r i v e (7 of 8) A-51...
  • Page 292 LAYOUTS A W SCHEMATICS F l e x i b l e D i s k D r i v e [8 of 8) A-52...
  • Page 293 LAYOUTS AND SCHEMATICS F l e x i b l e D i s k D r i v e 1 . 2 NB A-53...
  • Page 294 LAYOUTS AND SCHEMATICS F i x e d D i s k D r i v e F i x e d D i s k D r i v e (1 of 2 ) A-54...

  • Page 295: Fixed Disk Drive

    LAYOUTS AND SCHEMATICS [2 of 2) F i x e d D i s k D r i v e A-55...
  • Page 296 LAYOUTS AND SCHEMATICS N o n o c h r o a e C R T A-56...
  • Page 297 LAYOUTS AND SCHEMATICS M o n o c h r o w e P o w e r S u p p l y A S ?

  • Page 298: Color Crt

    LAYOUTS AND SCHEMATICS C o l o r CR T A-58...

  • Page 299: Color Power Supply

    LAYOUTS AND SCHEMATICS C o l o r P o w e r S u p p l y A-S9...

  • Page 300: External Monochrome Monitor

    LAYOUTS AND SCHEMATICS E x t e r n a l H o n o c h r o a e M o n i t o r C o n t r o l l e r E x t e r n a l M o n o c h r o m e M o n i t o r C o n t r o l l e r (1 of 4) A-60...
  • Page 301 LAYOUTS AUD SCHEMATICS E x t e r n a l M o n o c h r o m e M o n i t o r C o n t r o l l e r £2 of 4] A -6 1...
  • Page 302 LAYOUTS AND SCHEMATICS E x t e r n a l M o n o c h r o m e M o n i t o r C o n t r o l l e r [3 of 4] A-62...
  • Page 303 LAYOUTS AND SCHEMATICS E x t e r n a l M o n o c h r o m e M o n i t o r C o n t r o l l e r (4 of 4) A-63...

  • Page 304: External Color Monitor

    LAYOUTS AND SCHEMATICS E x t e r n a l C o l o r M o n i t o r C o n t r o l l e r E x t e r n a l C o l o r M o n i t o r C o n t r o l l e r [1 of 6)
  • Page 305 LAYOUTS AND SCHEMATICS E x t e r n a l C o l o r M o n i t o r C o n t r o l l e r (2 of 6] A-65...
  • Page 306 LAYOUTS AND S C H M A T I C S C o l o r M o n i t o r C o n t r o l l e r E x t e r n a l [3 of 6] A-66...
  • Page 307 LAYOUTS AND SCHEMATICS [4 of 6] E x t e r n a l C o l o r M o n i t o r C o n t r o l l e r A-67...
  • Page 308 LAYOUTS AND SCHEMATICS E x t e r n a l C o l o r M o n i t o r C o n t r o L L e r [5 of 6) A -6 8...
  • Page 309 LAYOUTS AND SCHEMATICS E x t e r n a l C o l o r M o n i t o r C o n t r o l l e r (6 of 6) A-69...
  • Page 310 LAYOUTS A W SCHEMATICS M e a o r y E x p a n s i o n B o a r d A -7 0...

  • Page 311: Memory Expansion Board

    LAYOUTS AND SCHEMATICS of 4 ] M e m o r y E x p a n s i o n B o a r d <1 A-71...
  • Page 312 LAYOUTS AND SCHEMATICS M e m o r y E x p a n s i o n B o a r d (2 of 4) A-72...
  • Page 313 LAYOUTS AND SCHEMATICS M e m o r y E x p a n s i o n B o a r d [3 of 4] A-73...
  • Page 314 LAYOUTS AND SCHEMATICS M e m o r y E x p a n s i o n B o a r d (4 of 4) A-74...
  • Page 315 LAYOUTS AND SCHEMATICS O L C I n h o u s e I/ F B o a r d A-75...
  • Page 316 LAYOUTS AND SCHEMATICS D L C I n h o u s e I/F B o a r d of 3) A-76...

  • Page 317: Dlc Inhouse I/F Board

    LAYOUTS AND SCHEMATICS DL C I n h o u s e I/F B o a r d [2 of 3) A - 7 ?
  • Page 318 LAYOUTS AND SCHEMATICS DL C I n h o u s e I/F B o a r d [3 of 3] A-78...
  • Page 319 LAYOUTS AND SCHEMATICS V i d e o t e x A d o p t e r B o a r d A-79...
  • Page 320 LAYOUTS AND SCHEMATICS V i d e o t e x A d a p t e r B o a r d of 5] A-80...
  • Page 321 LAYOUTS AND SCHEMATICS V i d e o t e x A d a p t e r B o a r d (2 of 5) A-81...
  • Page 326 V i d e o t e x S w i t c h b o a r d...
  • Page 327 LAYOUTS A W SCHEMATICS W i r i n g D i a g r a m V i d e o t e x (1 of 3) A-87...

  • Page 328: Wiring Diagram Videotex

    LAYOUTS AND SCHEMATICS W i r i n g D i a g r a m V i d e o t e x [2 of 3] A-88...
  • Page 329 LAYOUTS AND SCHEMATICS W i r i n g D i a g r a m V i d e o t e x (3 of 3) A-89...
  • Page 330 LAYOUTS AND SCHEMATICS K e y b o a r d A-90...
  • Page 331 LAYOUTS AND SCHEMATICS K e y b o a r d S c h e m a t i c A -9 1...

Table of Contents