NCR PC4I, Service Manual

Page 1: ...Personal Computer PC4i Service Manual...

Page 2: ...firmware become available NCR Corporation therefore reserves the right to change specifica tions without prior notice All features functions and operations described herein may not be marketed by NCR...

Page 3: ...nd Attempt Power Supply l eripherals Check Keyboard Check for Diagnostic Errors Restore Full Configur ation Test Total Memor y Test CRT and Disk Drives Re Installation Chapter 3 Level O Diagnostics Me...

Page 4: ...ntroller Test Serial Synchronous Controller Test Keyboard Main Menu Selection 3 Flexible Disk Drive Main Menu Selection 4 Flexible Disk Drives HELP Screens Read Only Drive A Test Read Write Drive A Te...

Page 5: ...ror Codes List of Major Error Codes Memory Error Codes Repair Procedure 01 Repair Procedure 02 Repair Procedure 03 Repair Procedure 04 Repair Procedure 05 Flexible Disk Drive Error Codes Repair Proced...

Page 6: ...Monochrome CRT Power Supply Assy Complete Assembly Power Supply Monochrome Deflection Board Monochrome CRT Color CRT Power Supply Assy Power Color Supply Deflection Board Color CRT Chapter 7 Monochro...

Page 7: ...ocessor Board Configuration Switches Jumper Settings Alternate Main Processor Board Switch Settings Jumper Settings Early type Main Processor Board Switch Configurations of Early type MPB Switch Confi...

Page 8: ...C C...

Page 9: ...be used with the NCR Personal Compter as well as expansion boards offered by NCR DISPLAY URIT The standard Display Unit consists of the following parts o Cabinet o Power Supply o 1 or 2 flexible disk...

Page 10: ...ISK DISK IOOKI 3IOKI Figure MO r 6 0KI I MEMORY E cl ANSION I tolMKII lJl _ 7 _K t I_ J GRAPHICS CONTAOl LER l2KI r LP 1 CONTAOU 1 A J FIJCED DISK CONTROLLER IJ217 1JCOl0flillVI KEYIIOAAD r n __rt LI...

Page 11: ...le in various models The standard internal RAM memory size for all models is 256KB The models currently available are 0 A 12 inch monochrome display 1 flexible disk drive and 256KB memory o A 12 inch...

Page 12: ...ter with the cabi net removed ONLy TRAINED ENGINEERS AND NCR TRAINED SER C VICE PERSONNEL SHOULD ATTEMPT TO WORK ON THE COMPUTER WITH THE CABINET REMOVED AND THE POWER ON It is recommended that the fi...

Page 13: ...CR workshops MODEL NUMBERS The model number of the NCR PC 4i is shown on the plate at the back of the unit The meaning of the model number is shown below 3277 XX XX XX XX T __ Language _Voltage Freque...

Page 14: ...k Drives 120 Volts 50 60 Hz 220 230 240 Volts 50 60 Hz U S English International English U K English Spanish French German Swedish Danish Norwegian Italian Finnish Figure 1 2 Model Number Definition T...

Page 15: ...o allow access to the Card Rack Assembly with power applied an extension cable can be made locally Figure 1 3 provides the information needed to make the cable Parts Required Receptacle Connector Fema...

Page 16: ...has been introduced Much of the information in this manual applies both to the Alternate Main Processor Board and to the two Early type Main Processor Boards The Alternate MPB is used in a variety of...

Page 17: ...2 1 Generally faulty systems can be classified into two types 0 Non operative a system where it is not possible to load a diagnostic diskette o Partially operative a system with sufficient working co...

Page 18: ...attached external devices printer etc that have separate power cords are plugged into properly grounded wall outlets Insert the Service Diagnostic diskette into drive A Use a working copy of the origi...

Page 19: ...ckly followed by steps through the increments of memory installed An audible tone or beep is followed by the display of some introductory messages about the software Then the prompt A or other appears...

Page 20: ...u ron ErrotCodN 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...

Page 21: ...tion for the correct positions Use the Service Diagnostics NOTE The Power ON diagnostics routines issue a set of codes see Table 3 1 Error Codes Chapter 3 to the parallel port which are applicable to...

Page 22: ...ace MPB Af ter First Attempt 1 Turn OFF the power switches for any external devices printer etc 2 3 4 5 Turn OFF the computer power switch Unplug the computer power cord and any external device power...

Page 23: ...on the computer again At ter Second Attempt 1 Turn OFF power and unplug power cords 2 Take out all expansion adapter boards for any features which had been added to the original basic machine Refer t...

Page 24: ...sconnected from the MPB serial port in step above the serial port switches see Chapter 8 must be changed to show the port disabled 6 Check all internal and external connectors that are visible and rea...

Page 25: ...h a monochrome CRT o for systems with a color CRT o for systems with a Videotex All power supply components are located on the power supply PBC Except for replacing the fuse F1 the power supply is not...

Page 26: ...2 12V 11 5V 10 5V 9 5V Connector 8 5V 7 Ground 6 Ground Hain 5 Ground Processor 4 12V Board 3 Ground 2 Ground 1 5V 4 Ground 3 12V Connector 2 5V Disk Drives 1 Ground 3 from the switch Connector 2 N C...

Page 27: ...ector J P 8 5V 4 7 Ground 6 Ground Main 5 Ground Processor 4 12V Board 3 Ground 2 Ground 1 5V 4 Ground J P 3 12V Conneetor 5 2 5V Disk Drives 1 Ground 3 from the switch Connector J P 2 N C Power Switc...

Page 28: ...nnector J P4 To Main Proceaor Board Po r Supply O K 7 No No Yes No Yes Replace Power Supply Replace Lina Filter Replace Fuse Possible Problem on Disk Driws Possible Problem on Main Processor Board or...

Page 29: ...Is output No Connect connector output plugged connector I I Yes I No Change Is Fuse normal Fuse Is Out I Yes I I I Is R902 burnt out Yes I Yes Is TH9D1 opened Change R902 Solder up TH9D1 put nor mal I...

Page 30: ...output w se to full been c rcu t started cepec ty I I No I Hes ov ercu r rent Check overcurrent protect ve protect ve Yes c rcuH started c rcu t I No I noticed I No Check overvol tags protective circu...

Page 31: ...wise to full been out circuit started capacity noticed I I I No Has overcurrent Yes Check ovarcurrent protective circuit protective circuit started I No Check overvol tage protective circuit Are Yes...

Page 32: ...I No Yes Replace Is 0352 Yes Replace R311 output normal No Is R352 short circuited Are D301 304 normal No Replace 0301 304 Yes Replace D352 I Yes Is Yes Is R306 burnt Replace Output out R3D6 no rmel...

Page 33: ...al to determine which part of the system is causing the trouble CHECK KEYBOARD 1 Check that the keyboard cable is properly plugged into the 5 pin connector on the back of the MPB If it is use either o...

Page 34: ...After Second Attempt 3 Parallel or serial port devices were disconnected in step 3 of After Second Attempt 4 Configuration switches were changed to restrict the memory test to the minimum 256KB in ste...

Page 35: ...rror the operating system is booted from the diskette and the system prompt A or other is displayed the procedure to recover from a nonoperative condition has been completed successfully 7 If the comp...

Page 36: ...tings d Replace the adapter board if removed for access to the switches e Turn ON the computer again TEST CRT ARD DISK DRIVES 1 Observe whether any characters and or the cursor are displayed on the sc...

Page 37: ...tive and running properly proceed to step 3 Check whether a diskette was inserted in disk drive A with the drive access lever turned to enable the drive prior to the start of the current test pass If...

Page 38: ...backup diskette has already been used use either of the diskette based sets of diagnostic routines to attempt identification of the problem If this step has not been done yet and a backup copy of the...

Page 39: ...he instructions in Test Total Memory for accessing the additional memory in 64 KB increments 2 Flexible Disk Drive Expander Kit 3 Fixed Disk Drive adapter board and connections to the drive s 4 Printe...

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 C...

Page 41: ...codes are shown if the screen error messages are not displayed because of malfunction The action to take for each specific error condition is suggested It is recommended to log all tests that are run...

Page 42: ...peration 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 3 2 MEM...

Page 43: ...C 0 C IIIMORY TEST 19211 see Note Following MEMORY TEST 25511 See Note Following LEVEL O DIAGNOSTICS 3 3...

Page 44: ...apter 2 Basic Troubleshooting of this manual and follow the procedures detailed there If a software memory error is found above 64KB the message MEMORY ERROR is displayed and the memory size in the di...

Page 45: ...programmed o The 8237A Direct Memory Access DMA Controller o The 8253 Timer o The 8259 Programmable Interrupt Controller KEYBOARD TEST The keyboard interface is tested to verify that a keyboard which...

Page 46: ...INSERT SYSTEM DISK AND PRESS ANY KEY TO TRY AGAIN is displayed if the boot disk is missing or improperly formatted ERROR RETURNS If no activity disk drive motor noise blinking cursor memory test occu...

Page 47: ...oups of tests the first group is always run whereas the second group is only executed when Level O Loop has been selected After completion the test sequence is concluded by the booting procedure if no...

Page 48: ...een for TOP OF MEMORY ooxxoxax RAM Test 00 64KB DOXDXXOX Parity Error D0 64K Notes Processor Corrective Actions Replace U6 is entering or M B HOLD See Note 1 Replace U14 See Note 1 Replace M S See Not...

Page 49: ...See Note 2 Replace RAM 64 12BKB TEST 64KB ecc to me mory confi guration and error message or C oaxxoxxx 128 1961 B 128KB II II 2 II II O OOO 196 256KB 196KB II II 2 II II O O 256 32DKB 256KB II II 2...

Page 50: ...r Boot action OXXOOODO Flex Disk Con FLOPPY DISK U46 Replace U46 troll er Feredy CONTRcn LER IC FAILURE OXXXXDXD Serial Control SERIAL I 0 Switch 3 on Replace U1 ler Test TRcn LER SWA must be or MPB F...

Page 51: ...ode Processor is enter ing HOLD CJXOOOOCJX Keyboard Test KEYBOARD In the Replace lf B ERROR Level 0 or keyboard Loop mode the key board connector or test adapter must be plugged Otherwise test run is...

Page 52: ...s SlflTCH SffiING COPROCESSOR BUT INDICATES No Test No Test Replace U5 or tfl8 ND COPROCESSOR IS DETECTED including fixed disk XXXODDXX Hipo Test XP EXTRA In Level D PERFORMANCE Loop pro OPTION IS ces...

Page 53: ...With B non system disk or no disk pre sent Fig 3 1 Error Messages on Screen and LEDs 6 of BJ C Note 11 Processor is looping in the respective test l Note 12 The following format is additionally displa...

Page 54: ...est XOXXDOOX EPROM Checksum Test XOXXDOXD OMA Controller Test XOXXDOXX 8253 Timer Test XOXXOXOD RAM Test DO 64KB 64 640KB XOXXOXOO Parity Error MEMORY TEST and or MEMORY ERROR ERROR IN BASE MEMORY or...

Page 55: ...No test Fixed Disk not connected device de fective controller defective For some of the error conditions which can occur during the automatic running of the power on diagnostics routines the indicatio...

Page 56: ...identical message code etc When a problem appears to be definitely located in one of thge pluggable MPB ICs the next step is disassemble the unit by removing the cabinet as shown in the Removal Replac...

Page 57: ...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 well train...

Page 58: ...C 0 C...

Page 59: ...rform For all menu screens corresponding HELP screens are available to further explain the purposes of the tests which may be selected Each menu and HELP screen is shown in this chapter along with the...

Page 60: ...attached external devices that were specified to be turned on after the computer The BIOS ROM power on diagnostics initialization routines perform the power on testing that occurs each time the machi...

Page 61: ...s the structure of the diagnostic system I Test Module 1 Test 1 Test 2 J t n Fig 4 1 Diagnostic Shell r r I Test Module 2 Test Module 3 Return to Shell and Error Log File I Test Module n Diagnostic St...

Page 62: ...ing tut once DR Preu Hlect1an end FB fer cantlnuau run of Hlecctan l F4 ta atop SELECTION Page 2 o the Main Menu containing items 9 to 11 is accessed by pressing the PgDn key The NCR Personal Co1puter...

Page 63: ...F4 is pressed If no test number is selected before the F8 key is pressed the series of tests 1 through 11 is repeated continuously until F4 is pressed Press the F6 key to access a set of utility rout...

Page 64: ...CRT RAM curaor addraaalng tha ASCII ch1r1ct1r 11t tha ac roll r11gi1t1r and var1aua aonttor attrtbutu Calar Grophlca dhplay Toatl tha CRT RAM curaor addraaalng tha ASCII character 11t tha IC ra l l r...

Page 65: ...memory tests included in selection 1 of the menu has run and that part of the memory has passed the test procedures If the selection was made and the Enter key pressed a MEMORY menu is displayed and...

Page 66: ...es 80 FDC failed to respond and the abbreviations and values on the next two lines are explained in Chapter 5 Diagnostics Error Returns DIAGNOSTIC SELECTIONS The following sections describe the result...

Page 67: ...ver by test patterns The program does not stop again after this point If no formatted disks are available and one or two are needed at this point exit from the diagnostics routines press F10 load the...

Page 68: ...Diak Drive 6 Monochrome Di sp Lay 7 Color Graphic Diaploy 8 Peri pha ra Ls F1 Explanation of Toots F6 Utilitiaa F9 Add Dalota THts ta Main Menu F1D Exit to DDS PASSED PASSED FAILS PASSED PASSED FAILED...

Page 69: ...Fl xplanatlon uf Selectlona Fi rermlnate Teat Module Preaa aelectlon and Enter for runnt1111 teat once OR Pre11 election and FH for continued run of aelectlon F4 to atop SELECTION Each of the five av...

Page 70: ...11911ent addra atng and law order addraasing capabi lttiH RAM Parity WritH chackerboard pattarna to all inatallad parity DRAM FIRMWARE Checkau VarHi H tha fl r1111ara chackau F3 Raturn to prevtaua aen...

Page 71: ...Address Test If selection 2 of the Memory test menu is chosen the RAM Parity test is run The name of the test is displayed while the test is in progress RAM ADDRESS PASSED F2 Tel lltnace Teac Module...

Page 72: ...f the test is displayed while the test is in progress RAM PARITY PASSED F2 Tenolnate Tut Madu le F3 Return to prevtou aenu Upon completion of the test either the PASSED message or an ERROR message is...

Page 73: ...milar to the other memory test menus 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 Refer to Chapter 5 of...

Page 74: ...the test is displayed while the test is in progress r _FIRMWARE CHECKSUM PASSED F2 Teno1nete Teat Madu le F3 Return ta previau menu Upon completion of the test either the PASSED message or an ERROR me...

Page 75: ...controller Taet1 the B253 t111ar and counter chip Teat the 9259 interrupt controller Teo ti the VLSI CPU contra l ler Teata the 6845 for monochrome operation Teat tha 6845 for color operation Teata th...

Page 76: ...d and parforaa a partial functionality teat Interrupt Varifia1 the interrupt controller can be acca ad and performs a partial functionality teat CPU Controller VarifiH the VLSI CPU controller can ba e...

Page 77: ...Test If selection 2 of the Controllers test menu is chosen the DMA Controller test is run The name of the test is displayed while the test is in progress r _DHA PASSED f 2 Terminate Teet Madu La F3 R...

Page 78: ...he name of the test is displayed as the test is in progress _FLEXIBLE DISK PASSED F2 ToMIit noto Taut Madu lo F3 Return to previou1 menu Upon completion of the test either the PASSED message or an ERR...

Page 79: ...of the test is displayed while the test is in progress _INTERVAL TIMER PASSED F2 T1r11inata THt Modula F3 Return ta pre11ioue menu Upon completion of the test either the PASSED message or an ERROR mes...

Page 80: ...f the test is displayed while the test is in progress r _INTERRUPT CDNTIIDLLER PASSED F2 Te inaie Teat Madul F3 R11turn to prevtaua aanu Upon completion of the test either the PASSED message or an ERR...

Page 81: ...f the test is displayed while the test is in progress r _CPU CONTROLLER PASSED F2 Terainete Teat Hodu le F3 Aetum to pravtoua aanu Upon completion of the test either the PASSED message or an ERROR mes...

Page 82: ...se the presence of a monochrome display adapter the program redisplays the Controllers test menu The name of the test is displayed while the test is in progress _CRT MONO PASSED F2 TeM11 net Teet Madu...

Page 83: ...es not sense the presence of a color display adapter the proeram redisplays the Controllers test menu The name of the test is displayed while the test is in progress _CRT COLOR PASSED F2 hrainata Ta t...

Page 84: ...to Chapter 5 of this manual for a description of error messages and recommended corrective actions KEYBOARD MAD MEllU SKLRCTIOR 3 When selection number 3 is chosen from the main menu screen a message...

Page 85: ...M I PS F9 F10 ALT SP CL INS ENTER TltE KEY cooes TD BE TESTED ANO VERIFY THAT TltE CORRECT COOE APPEARS JI TltE CRT DISPLAY ENTER F1 ANO F1D IN SEQUENCE TO EXIT TEST Copyright 1985 NCR Corp DEL PU NL...

Page 86: ...s section of the 11ain Henu Fl Explanation of Selections F2 Ter11inate Test Hodule Press selection and Enter for running test once DR Press selection and FB for continuous run of selection F4 to stop...

Page 87: ...k rotational speed accuracy Hecute the FLEXIBLE DISK SPEED Utility F3 Return to previous 1enu Read Only Drive A Test If selection 1 of the Flexible Disk Drive test menu is chosen the Read Only test is...

Page 88: ...nostics diskette BEFORE CONTINUING ensure that no diskette other than the diagnostics diskette and or a formatted scratch diskette is inserted in flexible disk drive A If any other diskette is left in...

Page 89: ...Otok 4 Reod Wri to Ent t re Diak 5 F xed Di k Contra llar F1 Explonetton of Selections F2 Toraitnato last Modula Oaatruct1ve teat to meintanance track Raad aactor zero on each track Read each aactor...

Page 90: ...at Read Write Entire Diak Wrlteo end raeda the entire dlak Thia 11 a d11tructlva taat thorofora tho NCR ODS FDISK and FORMAT utilltloa auat be run on the fixod dllk before uolng th dlak again Fixed Di...

Page 91: ...actions Read Only Sector 0 If selection 2 of the Fixed Disk Drive test menu is chosen the Read Only Sector O test is run _READ ONLY SECTOR O Drive xx PASSED 1 2 Te tnete Teet Hadule Fl Return to pr v...

Page 92: ...etc I After selecting the number of the drive to be tested the Read Only Disk test is run _READ ONLY ENTIRE DISK F4 Stop Teat1ng Drha__DO Head_ _On Track__Onnn Sector_nn Surface 1rror11 Soft orrora_OO...

Page 93: ...is increased by 1 for each complete test cycle until F4 is pressed to stop the test If 8 any key space bar or any alphabetic or numeric key or some special characters is pressed the Fixed Disk Test Su...

Page 94: ...rst Fixed Disl Second Fixed Disk etc 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...

Page 95: ...at 00 00 or 01 and are increased to maximum values as above Cycle number is 0001 if this test is being run just once if continuous run is chosen cycle number begins at 001 and is increased by 1 for ea...

Page 96: ...n 5 of the Fixed Disk Drive test menu is chosen the Fixed Disk Controller test screen is displayed The NCR Personal Co1puhr FIXED DISK DRIVE FIXED DISK CONTROLLER PASSED F2 Ter1inate Test odule F3 Ret...

Page 97: ...CHROME DISPLAY MAIN MENU SELECTION 6 When selection number 6 is chosen from the main menu screen the Monochrome Display test runs by briefly di playing the test name as it tests the controller _CRT MO...

Page 98: ...Lin each daaonstrat1ng one or II combination of attribute auch nan al video tnverGa video underlining blinking and high tntonalty ore dhplayod I r _CHARACTER SET A pattern of ell characters which can...

Page 99: ...from the main menu screen the Color Graphics Display test b egins by briefly displaying the test name as it tests the controller _ CRT COLOR GAAPKICS Then without stopping the test displays this scree...

Page 100: ...Dlua r ed gr een b lue r ed gr een on wh1 te ere d11played I Are the correct attribute dhpleyed Y NJ_ If nNn is entered an ERROR message is displayed and choice similar to those described in the nunsu...

Page 101: ...st tao t1nes tart at the botto11 uf the scr aan end scroll unul they reach the i op Than the third Ltne i added to the dHpley l Ir is entered an ERROR message is displayed as berore If y is entered th...

Page 102: ...III 1 I REO IllI I IllI I III I III IIIIIII I I I II I IllI IllI II IIII I IIIII I II II IIll III BROWN I IllI II I I III I IllI I I I I IIIII I II I I I III I 11 the 11ereen correct Y Nl_ If N is en...

Page 103: ...PHICS 640x400 8 W DARKGREY LIGHTGREY WHITE I ____________ Is the screen correct Y H _ If N is entered an ERROR message is displayed as before If Y is entered the next screen is displayed GRAPHICS 4 0...

Page 104: ...Y NI If N is entered the Color Graphics Display test has been successfully completed and the programn returns to the main menu If nyn is entered additional lines for testing light pen performance are...

Page 105: ...played Th NCR Par1an l Caaputar Copyright 1985 NCR Corp PERIPHERA LS Avallabl Sal1celon1 1 Serial Part laapback 2 Perell l Pare laapback 3 G arlc Prlntar PC Ca p1tlbl Prlnt1r F1 Esplenetlan ar Sel1ccl...

Page 106: ...t on the parallel printer PC Coapatlble Printer Prlnto the ASCII character at and PC apeci fie control codas on a PC compatible printer F3 Return to previous anu Serial Port Loopback Test Peripherals...

Page 107: ...recommended corrective actions Parallel Port Loopback Test Peripherals Menu Line 2 When selection number 2 is chosen from the peripherals menu the Parallel Port Loopback test is performed The name of...

Page 108: ...port of the computer Any parallel printer can be tested using the generic printer test Only a printer which is designed to respond to PC specific control codes for additional functional capability can...

Page 109: ...eric Printer test is run The name of the test is displayed while the test is in progress GENERIC PRINTER PASSED F2 r tnota Tan Modulo F3 Aaturn to pravioua manu Upon completion of the test either the...

Page 110: ...f the test is displayed while the test is in progres3 r PC COMPATIBLE PRINTER PASSED F2 Tarainato Teat Module F3 Return ta previous 111nu Upon completion of the test either the PASSED message or an ER...

Page 111: ...hk head ror tronaparution i ravlde1 ut1llt1ea far error lag Hlntanence Scrune far aanachroae d11phy 1l1gnaent Screane far ca lar d1ep lay 1L1 gnHnt Ut1l1ty rar propar disk allgna1nt 01lplay1 d1ak 1pae...

Page 112: ...ry controllers test pictures When selection 11 is chosen from the main menu screen of the LEVEL 1 Diagnostics the BTX Videotex test menu screen is displayed The NCH Personal Comnputer Available Select...

Page 113: ...NCR Personal Computer __USART Local Test PASSED F2 Terminate test module F3 Return to previous menu Remote Test Copyright 1985 NCR Corp BTX If selection 1 of the Videotext BTX test menu is chosen the...

Page 114: ...J2 1 J2 8 J2 9 J2 5 J2 3 J2 5 J2 3 J2 6 J2 4 J2 6 J2 4 J2 12 J2 13 J2 12 J2 13 J2 15 J2 14 J2 15 J2 14 Before remote loop testing is started you are requested to insert the proper turnaround plug in t...

Page 115: ...does not permit to test DRCS characters Press any key to continue Test Screen No 2 Testing the inverse character and attribute memory The screen display shows white characters blinking on a blue back...

Page 116: ...ea designates the area in which characters can be displayed This picture is useful for checking the screen setup and the position of the image on the screen Press any key to continue Test Screen No 6...

Page 117: ...system some guidelines need to be established It is considered good practice to reduce the system to a basic configuration before troubleshooting begins This can help eliminate problems that are not m...

Page 118: ...all cards remaining in the expansion slots correctly installed Refer to the After First Attempt section of the Troubleshooting Non Operative Systems chapter of this manual 3 Check the switch settings...

Page 119: ...R BOAHD COMPONENTS For those not familiar with the Main Processor Board MPB it is recommended that some time should be taken to learn the location of the major board components Figure 5 1 shows the pl...

Page 120: ...1911 FLU DISK J1 5tft FPJI CONN I I XPPERF COHN UH t i B c J t 108 IZSJ l c J c 10 a l _____ J1_ _ _ __ I c J FLU DISK COHH D I____J_ll_ _ __ I IU1A DIIA I r3 I PROM Ef J 11 SOCKU Q Q I _t_PR_o_ _ 0t...

Page 121: ...s memory up into segments and allocates 64K bytes to each segment Using this method of memory segmentation it is possible to address 1 MB of system memory To address a memory location it is necessary...

Page 122: ...e actual physical address of the memory location A more thorough description of 8088 addressing can be found in one of the reference sources for the Intel 8088 microprocessor _____ most significant I...

Page 123: ...1 C 2 C LEVEL 1 DIAGNOSTICS ERROR RETURNS O t 3 Bank Figure 5 5 Memory Segment Locations for the Alternate 1 and Early type MPB 2 5 7...

Page 124: ...ta port Each MAJOR code may have several DETAIL codes associated with it The DETAIL codes are specific descriptions of the error and are displayed as hex values on the CRT only Data that is to be retu...

Page 125: ...N D J I mra1111 d a 1 1 1 11 c c i iw ir 0 oc Jc Jc Jc JO JOI c J c J c J c J 11 0 c J t J c J c J c J c J ou JIS c J c J c J t J t J c J c J GE c J c J c J c J 0 n ____ J _ ___ c J c J c J c J o LI c...

Page 126: ...EX 04 00Date Time EXP DATA AA OBS DATA A8 This code represents MAJOR An error was encountered in comparing data read from the FDC subsystem DETAIL No detail error EXP DATA The data pattern AA was expe...

Page 127: ...ror Codes PERIPH 01 PERIPH 02 PERIPH 03 SERIAL COMMUNICATIONS ERROR PRINTER PORT ERROR PRINTER ERROR Error Codes of Maj or System Controllers CONTROL 01 CPU ERROR US CONTROL 02 INTERRUPT CDNTROLLER ER...

Page 128: ...D 09 FIXED DISK VERIFY ERROR FIXED 10 FIXED DISK ERROR INTERNAL Figure 5 7 Major Error Codes 3 of 3 DETAIL ERROR CODES AND REPAIR PROCEDURES Not every MAJOR error code will have associated DETAIL code...

Page 129: ...whj_ch bank contains the defective RAM IC This can be done by using Figure 5 5 Refer also to Figures 5 3 and 5 4 shown earlier in this chapter Locate the segment number in the table and find the data...

Page 130: ...6K ues U84 UB3 UB2 UBI U80 U79 UIB un 5000 6000 3000 256K 10 640K 9000 640K U94 U93 U92 U91 U90 U89 U88 UB7 U86 8000 Segment Memory 0001 w Cooe Range 4000 320K V I JB HB GB FB EB DB CB BB A8 5000 384K...

Page 131: ...33 U32 U31 U30 U29 U28 7000 512KB EXP U26 U25 U24 U23 U22 U21 U20 U19 8000 640kb CARO UB U7 UB U5 U4 U3 U2 U1 Figure 5 9 RAM Memory IC Location for Early type MPB Segment 8 Segment 4 A Parity C J t 8...

Page 132: ...I I ue3 un UII l 81 e I BBi I I UM 1 11 U73 1 11 Ul2 l I UII II 1 s se I 1 s se 11 1 l I l I Qa RP U21 I UM U7 Ul3 Ul2 CJ I nu I I I I 1 11 11 1 UM l I ut6 uee U71 U93 lilt D II 1 s se I I Ul1 l I U1...

Page 133: ...gments of memory Figures 5 11 and 5 12 respectively show the location of segments on both Main Processor Boards and on the Memory Expansion Board as well If the diagnostics report a PARITY ERROR after...

Page 134: ...epeated execution of the RAM PATTERN TEST then the problem is also associated with the addressing hardware and the RAM ADDRESS TEST should be used to provide further information A pattern failure that...

Page 135: ...LEVEL 1 DIAGNOSTICS ERROR RETURNS C C Figure 5 13 RAM Memory Components for Alternate MPB _ Fi ure 5 14 HAM Memory Components for Early type MBD 5 19...

Page 136: ...5 03 Low address conflict AO A7 Repair Procedure 03 RAM ADDRESS ERROR will return Detail codes that help isolate problems with the system address bus The ADDRESS PATH is checked in the hardware for in...

Page 137: ...ry then reads the patterns back to verify that all data bits are functioning properly This test is more extensive than the pattern test with the exception that intermittent errors are not checked ROM...

Page 138: ...URNS 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 5 22 Figure 5 15 ROM Hardware...

Page 139: ...mponents 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 aa Major code WW De...

Page 140: ...03 Attempt to write a write protected disk 02 Address mark not found on track 01 Bad command internal error Accompanying message NOTE This message is not displayed for major code FLEX 06 DV RTY STO S...

Page 141: ...Oriv1 A 01 0 Or ve B 01 0 DO UM Selecl 2 Or1vl A DO 0 Or ve B DO I FOC F e ble O sk Con1 011er 1 00 fleuble Disk Drive llatu1 Dyl 1 llatua lyla 2 Log c Level I lndtCIIH Nol Ustd That FDC Trted IO Log...

Page 142: ...sor Assembly Clamp Arm Assembly Stepping Motor MFD Control Board Terminating Resistor Pack Header Jumper HS DSO DS1 Etc Jumpers for Strapping Incl ML DD Motor Assembly Read Write Board Write Protect S...

Page 143: ...t the computer from loading the operating system during any boot operation For systems that have two flexible disk drives the second drive can be strapped to be drive A Figure 5 19 shows in detail the...

Page 144: ...es solves the problem then the specific detail code may provide information as to the cause of the failure Should it be necessary to return the disk drive unit to a service center for repairs the oper...

Page 145: ...C Figure 5 20 0 Figure 5 21 LEVEL 1 DIAGNOSTICS ERROR RETURNS Ribbon Cable Terminatjon Flexible Disk Related Hardware Alternate MPB 5 29...

Page 146: ...refer to the specific detail code that was reported by system diagnostics DETAIL CODE 88 Suspect failure of disk drive unit Refer to Repair Procedure 05 DETAIL CODE 80 Suspect intermittent failure of...

Page 147: ...for intermittent operation DETAIL CODE 04 Suspect disk drive failure Check index sensor on drive Figure 5 18 shows the location for obstruction Refer to Repair Procedure for verifying drive failure DE...

Page 148: ...ard Repair Procedure 07 Check that the keyboard is connected properly to the main processor board connector The pins of the keyboard connector should be checked for damage DETAIL CODE 01 Suspect that...

Page 149: ...processor board components that comprises the keyboard interrupt signal path DETAIL CODES 03 and 04 These codes indicate an internal keyboard failure of the CPU controller Check inputs to U7 U125 and...

Page 150: ...eyboar d Related Hardware Early type MPB VIDEO DISPLAY ERROR CODES CRT ERROR TEST Format of code MON0 01 ww Date Time EXP DATA xx OBS DATA yy OR COLOR 01 ww Date Time EXP DATA xx OBS DATA yy Where ww...

Page 151: ...th systems that use a color video display If you have another video display controller card try to install it Should this not solve the problem remove the controller card from its expansion slot locat...

Page 152: ...display is out of alignment refer to the Chapter 7 Adjustments of this manual for more information DETAIL CODES 01 02 06 11 12 Suspect a defective CRT Controller card probably the CRT Controller chip...

Page 153: ...iled Otherwise suspect a defective RAM IC on the CRT controller card DETAIL CODE 01 and 11 These codes refer to the monochrome and color units respectively They indicate an intermittent failure of a l...

Page 154: ...bit O as the LSB An x represents the Don t Care State The detail codes are to construct the error code for all serial communication failures Block 1 codes represent failures of the 8250 serial commun...

Page 155: ...c 1 Sl Enables Enables Enables s CD Enable Data Transmit Receive Available Register line Status Reg1s1er ln1errup1 Empty lntr Interrupt Interrupt Logic Interrupt Interrupt tor ID 10 0 en 10 lnterrup1...

Page 156: ...0 0 0 0 0 1 0 0 Figure 5 26 Serial Communications Status 2 of 2 Repair Procedure 10 Before starting to troubleshoot the communications channel it is re commended that the system configuration switche...

Page 157: ...n internal error is returned by the detail code bit 4 at logic 1 then suspect a failure of the 8250 serial communications IC Errors that occur during external loop back checks require that the line dr...

Page 158: ...pin 8 to determine if the interrupt signal is operational refer to Figures 5 26 and 5 27 respectively Figure 5 28 Figure 5 29 5 42 Serial Communications Port Hardware for Alternate MPB Serial Communic...

Page 159: ...ror No interrupt on printer port Repair Procedure 11 To perform the diagnostics test on the printer port it is necessary to install the Turnaround Test Plug Part No 017 004431 If such a wrap plug is n...

Page 160: ...th loop back connector 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 Should the test fail then the p...

Page 161: ...erformed on the serial port If the serial port also fails the diagnostics test the problem is a bad bipolar ROM 09 which generates chip selects for serial and printer ports or a defective component on...

Page 162: ...etail code DO 1 Printer time out D3 1 I 0 error D4 1 Printer select D5 1 Out of paper D6 0 Ack internal D7 0 Printer busy Repair Procedure 12 Refer to previous Repair Procedure 11 Check the installati...

Page 163: ...s will suspend operation of the microprocessor If this condition is observed then check RDY and DMA wait inputs into the CPU VLSI 07 125 If one of these two control lines is not active then suspect th...

Page 164: ...ata bus The 8259 may be internally damaged resulting in intermittent failure replace U25 0132 IBTERVAL TIMER 8253 TEST Format of code CONTROL 03 ww EXP DATA xxxx Date OBS DATA Time yyyy Where ww Detai...

Page 165: ...code for Detail 1x CONTROL 04 1x EXP DATA xx Date OBS DATA yy Time Where xx Expected data from register yy Observed data from register for DETAIL 70 CONTROL 04 70 EXP DATA xxxx Date Time OBS DATA yyyy...

Page 166: ...d write test to PIO control register Port B Repair Procedure 17 The system PIO uses port B for the following control functions control the speaker on the Main Processor Board enable RAM parity read th...

Page 167: ...line control register 04 Read write to modem control register Repair Procedure 18 Suspect defective 8250 U1 U37 or intermittent failure of data bus Perform the PRINTER PORT TEST The printer uses the...

Page 168: ...for more information on troubleshooting flexible disk drives CRT CONTROLLER 6845 TEST Format of code CONTROL 08 ww Date Time EXP DATA xxxx OBS PATA yyyy Where ww Detail code xxxx Expected data from r...

Page 169: ...BB FF Command error internal Address error Sector error Reset error Initialization error DMA across 64K error internal Bad track Uncorrectable data error ECC soft error Controller error Seek error Tim...

Page 170: ...Major code ww Detail code xx location on disk related to error code 01 Command error internal Address error 02 04 05 07 09 OB 10 11 20 40 80 BB FF Sector error Reset error Initialization error DMA ac...

Page 171: ...d disk Check the cable connections to the drive unit Suspect failure of the fixed disk controller card DETAIL CODE 02 Probable failure of the fixed disk controller card DETAIL CODE 04 Suspect failure...

Page 172: ...L CODE 80 The fixed disk drive failed to respond to the fixed disk controller Check the drive for correct installation DETAIL CODE BB Perform the diagnostics test again Suspect failure of fixed disk c...

Page 173: ...epair Procedure 25 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 TEST PICTURE ERROR ERR 26 ww Where...

Page 174: ...C C 0...

Page 175: ...n the text When a complete assembly is replaced contact your supplier or NCR office for information concerning the possible repair of the defective assembly WARRING Disconnect the power cord before re...

Page 176: ...bove procedure in the reverse order Figure 6 1 Cabinet Removal CARD RACK ASSEMBLY To remove the card rack assembly refer to Figure 6 2 and use the following procedure 1 Be sure that the ON Off switch...

Page 177: ...able connecting the disk drives to the card rack assembly is long enough to allow complete withdrawal of the assembly and further work on the assembly 5 To completely disconnect the card rack assembly...

Page 178: ...lower slot positions You can install shorter length boards in the upper slot positions PRIIITED CIRCUIT BOARDS All printed circuit boards except power supply and deflection board are contained in the...

Page 179: ...Alternate and Early type MPB as well 1 Remove the 5 screws and lift off the metal cover A as shown in Figure 6 4 When removing an Alternate MPB the Speaker Connector JP7 has to be disconnected before...

Page 180: ...the MPB to the rack 4 Unscrew the power connector A on the top right of the MPB see Figure 6 5 5 Removefan B on the front panel of the rack 6 Using a small pair of pointed pliers squeeze the lugs on e...

Page 181: ...in processor board use the above procedure in the reverse order C c C C Figure 6 5 Board Removal DISK DRIVES To remove the disk drives first remove the cabinet and card rack assembly refer to Figure 6...

Page 182: ...fixed disk drives D B A Figure 6 6 Disk Drive Removal 2 Disconnect the power cable B from the disk drive 3 Remove the knurled screw C 4 Remove the two screws D from the top of the disk drive 5 Slide t...

Page 183: ...net and card rack assembly refer to Figure 6 7 and use the following procedure 1 Be sure that the ON OFF switch is in the OFF position and that the power cord is disconnected 2 0 3 4 Remove the two sc...

Page 184: ...e sure that the ON OFF switch is in the OFF position and that the power cord is disconnected 2 Using a small screwdriver push the control knob off the spindle as shown in Figure 6 8 3 From the front o...

Page 185: ...may be removed as a complete assembly CRT and power supply or the power supply may be removed separately Remove the cabinet refer to Figure 6 9 and use the following procedure COMPLETE ASSEMBLY 1 Dis...

Page 186: ...se 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...

Page 187: ...power supply board 2 Remove the two screws B and disconnect the Ground wire C 3 Slide the power supply board towards the back of the CRT assembly and lift out To re assemble the power supply into the...

Page 188: ...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 Figure 6 11 Discharging CRT The monochro...

Page 189: ...Monochrome Deflection Board Removal To replace the deflection board use the above procedure in the reverse order Be sure that the high tension lead is fully seated into the CRT tube HOBOCBROME CRT VA...

Page 190: ...13 Monochrome CRT Removal 3 Disconnect the high tension lead B from the back of the CRT tube 4 Disconnect the small PCB C from the end of the CRT tube 5 Disconnect the ground wire D from the back of...

Page 191: ...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 A Figure 6 14 Color CRT Power Supply Removal 3 Disconnect th...

Page 192: ...upply it is first necessary to remove the complete CRT Power Supply assembly Then Crefer to Figure 6 16 and use the following procedure 1 Disconnect the connectors A from the power supply board 2 Disc...

Page 193: ...be 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 The color deflection board can be removed with the...

Page 194: ...screws D from the bracket that secures the deflection board to the frame Break the adhesive bond A bet ween the end of the CRT tube and the small PCB disconnect the small PCB from the end of the CRT...

Page 195: ...ead 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 To remove the CRT remove the cabinet...

Page 196: ...end of the CRT tube 5 Disconnect the single wire B from the back of the small PCB 6 Disconnect connector B from Power Supply see Figure 6 17 7 Support the CRT tube remove the four screws from the fro...

Page 197: ...agnostics Disk contains a II 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 control...

Page 198: ...ating All adjustments should be made with plastic adjusting tools Before removing the CRT high tension lead the tube should be discharged by inserting under the cap a screwdriver that is connected to...

Page 199: ...ADJUSTMENTS DISPLAY OUT OF FOCUS Adjust focus trimmer A DISPLAY TOO DIM Adjust brightness trimmer B 3...

Page 200: ...isplay 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 LON...

Page 201: ...AY NOT LINEAR Adjust linearity trimmer E DISPLAY TOO WIDE NARROW Adjust coil F see Character Field Size DISPLAY TILTED Loosen the locking screw G and rotate the yoke H assembly tighten the locking scr...

Page 202: ...djustments the CRT assembly must reach normal operating temperature The unit should be switched on for at least half an hour with the brightness control turned to maximum To display the desired test s...

Page 203: ...to continue F3 Return to previoua manu Preae selection number end ENTER to choose from Av11il11bla Selection SELECTIOIF For any trimmer adjustments use only plastic tools WARNING Very high voltages ar...

Page 204: ...picture to begin your adjustments refer to Figure 7 5 2 Turn H HOLD VR502 in a clockwise direction until you see changes overlapping on the right edge of the white picture Mark this position on the t...

Page 205: ...coil reaches extremely high operating temperatures Contrast Sub H V V o Service Hold Lin Switch TPBA TPBB V Position TP1Z TP9Z Fcicui L552Q Figure 7 5 Deflector Board Ajustments and Test Points HORIZO...

Page 206: ...tain a white test grid on the screen select 1 from the Alignment Utility and refer to Figure 7 5 2 Adjust V HEIGHT VR 403 until the picture height is approximately 150mm 5 9in 3 Adjust V LIN VR 402 to...

Page 207: ...B1 blue VR6G1 green VR6R1 red and SCREEN fully counterclockwise 3 Turn VR6R2 and VR6B2 to their mid positions 4 Set the Sub Brightness VR201 and the external Brightness control to minimum 5 Set the Se...

Page 208: ...until a standard even whiteness is obtained 3 Confirm that the white display does not change when the External Brightness control is turned SUB BRIGHTNESS 1 Select 6 from the Alignment Utility to obt...

Page 209: ...to the focus of the middle Hin the top row CONVERGERCE These adjustments are factory set and are not normally required in the field If making these adjustments be sure that the system is not near any...

Page 210: ...12 so that the red and blue vertical lines are superimposed on each other violet lines c4 Lock Ring f9 e Figure 7 7 Convergence Adjustments 4 Adjust c4 and d12 together so that the horizontal red and...

Page 211: ...NERAL 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 adjustmen...

Page 212: ...ALIGNHEliT 1 Set contrast coarse regulator VR518 and the potentiometers VR601 602 603 in central position 2 Set brightness to minimum contrast to maximum and display area to high intensity white 3 Set...

Page 213: ...program and switch on FBAS channel via keyboard 2 Connect FBAS signal to socket Check display geometry and display quality If necessary slightly adjust ADJUSTKERTS FOB VIDEOTEI ll BITOB BTX 008 007237...

Page 214: ...99 Adjust L552 to obtain 217 mm horizontal width Short circuit Test Point 8A and 8B Adjust VR 505 so that an approxinately stable picture is obtained VERTICAL HEIGHT ARD LIIIEAJUTY Adjust VR402 vertic...

Page 215: ...rating system disk in drive A Load VIDEOTEX Diagnostic Program from disk in drive B The program concerned is named T1 Picture 1 could be used for size adjustment Display a picture by means of the 15KH...

Page 216: ...C C C...

Page 217: ...ne jumper are used to define the system configuration The location of these switches and jumpers are shown in Figure 8 1 There are many other jumpers on the board required for factory set up and they...

Page 218: ...are not used in the PC 4i Switch SVA This second block of eight switches defines the following functions o Switches 1 and 2 Memory capacity of the MPB 0 0 0 Switch 3 Switch 4 Switch 5 Serial port Para...

Page 219: ...s are installed it may also be necessaey to temporarily remove some of these boards To set the switches press the end of the rocker switch which corresponds to the desired setting Use a ball point pen...

Page 220: ...1 i 1 M al iii M 256K to 640K 1 Drive 3 Drives Copmm o 1 iii 1 ffli j 1 ffl M ON 2 on e ON 4 Qn es ON ___ ___ Coprocessor installed Displays 1 al ffl 9 ffl 0 H 8 4 No coprocessor Monochrome No Display...

Page 221: ...t ON l i i Bank Oat 256K Bank 1 at 0 Bank 2 at 0 ON Bank 3 at 0 Parallel Port Disabled 1 ii i i l ffl ffli ffl ON ON Parallel Port Enabled Bank Oat 64K 641 12345171 Bank 1 at 64K 64K l Bank 2 at 256K...

Page 222: ...ms to normal operation 2 Closed conforms to test operation JP 5 Factory set has to remain in closed position JcP 6 Deselects the floppy disk controller on the Alternate MPB 1 Open deselects the on boa...

Page 223: ...Early type MPB 2 may have been installed into the system Both main processor boards have one switch block and several jumpers on board The two boards are similar in design and differ only slightly in...

Page 224: ...Capaclly Swllch 3 011 l McM M 121KB Swllch 4 On Memo y Capacllv Swllch 3 On l aMuMM 192KB Swllch 4 011 Memo y Capacllv Swllch 3 011 l McOMM 251KB Swllch 4 011 Alpha Conlrollar Swllch 6011 l oMaOOM Swl...

Page 225: ...wllc 15 Oll MoooMo 140 a 25 Swllch I On JP 5 Closed RS 232 and Parallel Printer Porta Enabled JP 5 Open Parallel Printer Port Enabled Oraphlca Conlrolltr Swllc 15 On l oMMcoo 10 a 251 Swllc 11 OH I Fl...

Page 226: ...J E C J c J c J t C J c J c J z z Ii Q l I C l c J o ci C C CC C ii ci 2 IC 0 h c J c l w u z il C l c J _ fi ot U I u c i i 0 0 0 li c J c J c J Setting as shipped I 2 I 2 l 64 KB i 256 KB I 1 l I 1...

Page 227: ...0 ALPHA DISPLAY ADAPTER English French German Italian Spanish Closed Language Selection JP2 STRAPPING INFORMATION Danish Finnish Norwegian Swedish Open Figure 8 10 Location of Jumpers 8 11...

Page 228: ...sed for monochrome CRT For jumper location and language selection see figure below Strapping for Graphic Controller Board 017 0044063 English German French Italian Spanish Closed Languaga S l ctlon J3...

Page 229: ...ther Languages Closed Closed JI JJ J4 Jl Monitor Connector 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...

Page 230: ...40364C X1 X2 1 2 2K RAM factory set 2 3 BK RAM 1 2K RAM factory set 1 2 2 3 BK RAM I 1 X3 DCD A Jumper always installed I 1 X4 DSR B Jumper always installed I 1 X5 CTS A Jumper always installed 1 XS 1...

Page 231: ...2 1 2 2 3 1 2 2K RAM BK RAM factory set 2K RAM 2 3 BK RAM factory set 1 1 XS 1 12 IRQ 2 factory set 2 11 IRQ 3 XB X9 3 10 IRQ 4 4 9 IRQ5 5 B IRQ 6 6 7 IRQ 7 1 1 2 Phase Lock Loop filter switching over...

Page 232: ...Xi Figure 8 14 Location of Jumpers FLEXIBLE DISK CONTROLLER BOARD 1 2MB lumpen IJPl2 Jl II ADDRESS PULl CllBM PtlXT DFF ON JFI JF7 1F7 Ptl IBM Al ON DFF m e CE Je OE Jm E 5 JPI OFF ON ON OFF Figure 8...

Page 233: ...0 aooa c J I 1 000 aaaaaarn rnc J c J c J CJ c J CJ c J c i c Jmm c J c J CJ CJ D t J c Jc J Ejonooa OOOc J CJ CJ D c JO J1 Disk Drive Control Signals J2 Disk Drive 1 Read Write Data J3 Disk Drive 2 R...

Page 234: ...re 8 17 Location of switches Switch Settings W1 W2 W3 W4 1 2 1 2 1 3 2 3 W5 W6 2 3 W7 St 1 Jumper Block Description Position 1 2 1 1 Drive Drive C Drive D Type 1 1 1 1 ST 225 MITSUBISHI 1 D 1 0 NEC D...

Page 235: ...Location of Switches Switch Settings W1 1 2 W2 1 2 W3 1 3 W4 2 3 W5 W6 2 3 W7 8 1 Jumper Block Description Position 1 1 2 1 1 Drive Drive C Drive D Type 1 1 1 1 Miniscribe 3425 TEAC SD 250 0 1 0 1 ST...

Page 236: ...J_ J_ J_ 1 2 3 4 8 7 6 5 Figure 8 19 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: ...0 0 OSI 0 0 Drive A Figure 8 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Drive B Jumper Flexible STRAPPING INFOR4ATION 0 0 0 0 DS3 DS3 DS2 DS2 0 0 0 0 DS2 0 0 0 0 0 0 0 0 0 0 0 0 DS1 0 0 0 0 OSI 0 0 0...

Page 238: ...C...

Page 239: ...ve Flexible Disk Drive 1 2 MB Fixed Disk Drive Monochrome Monochrome Color CRT CRT Power Supply Color Power Supply External Monochrome Monitor External Color Monitor Memory Expansion Board DLC Inhouse...

Page 240: ...0 0...

Page 241: ...Early type Main Processor Board C 1711 A 1...

Page 242: ...1 02 13 Cl 11 01 SI J SI u OEN 16 DES 1 81 52 18 S2 92 DIR 4 DATRI 1 C1 sv 16 r ue1 INTAI 14 I INTA I CLKBB 2 s I CLK J1_ NC I AEN 6 IOWC I 4 7K I AEN RO GT osa as JI RD GT1 25 ase 2 as TEST I S2 28 L...

Page 243: ...04 12 AEN AENI Early type Mein Processor Board 2 of 14 A 3 1 02 2 B1 e 4 C2 4 04 1 A4 2 C2 2 DI 1 04 1 0 FLEX DISK SERIAL 1 F PRINTER 1 F 1 0 llC oC I 04 2 Cl 3 01 4 A4 II RDYTODMA 2 CJ l 04 2 Cl 4 _...

Page 244: ...I 12 WRfl READ xo s01 011 1 1_ _ A _ 1_ _s__ i I 0 1 1 02 021 9 A l7 I I 0 2 2 103 03t 7 A IB __ I I X 0 3 3 404 Ql l 6 A 19 _ I l sv 1 1 AU l2K I R22 4 7K 27 A1 U118 1 IF U t i I C 98 RGTR XAI 1 1 9...

Page 245: ...V 16 i 111 411 4 7K L _J l 15 1 2 1 CI ROMAORSL XA9 1 9 XAB 2 1 74LS27 12 74LS27 XIORI I U116 10 U116 sv 16 u101 4 7K L ____ __ CARSLTD 1 2 131 74LSH II INTAI U93 I I 2 BJ RAMAOSEJ 11 6 _64 O OO P ___...

Page 246: ...5 of 14 A 6 v MA7 9 CID MA7 9 CtO MA6 13 32 32 MA 16 MAS 11 M MA4 UA MAl 12 4 MA MA2 2 2 u I MAI 7 MU E L RAS8 4 I Ne RAse I Ll Nc CASe 15 Cl CA59 15 I Cl La L C2 1 c I C2 La u I Cl _ Cl WE J WE 3 I L...

Page 247: ...l D AFPi x v x v MU g CID MA g CID 64 MAI 13 3l MA 32 MAS I II MAS II II I A II I MAJ 12 MAJ 12 MA2 I 2 MA1 6 1 MAI 1 1 MAI 1 1 MAI S CID I MAI CID I RAS11 I l NC RASII NC CASI IS Cl CAS1 15 I Cl I Cl...

Page 248: ...__ BA B Ua Sa A4 Early type Main Processor Board 7 of 14 A 8 x v x v x v MA7 9 CID 84 MA7 9 CID 84 A 9 CID 84 f A8 1l MAI 13 l2 12 12 MAS a MAS 18 18 18 MA4 11 MA 11 8 e I UA MAJ 12 MAJ 12 4 4 4 MA M...

Page 249: ..._ NC 11 n CAS ll 15 C1 CASll 15 I Cl 7 Lal 4 7K 1 I 1 La I CZ I CZ _ 6 s 7 J 1 MDI La MD2 CJ I Cl WE l WE l I MDJ L L __ M0 4 L o I U50 I U59 MOS MO 1 I 1 rKe I M07 0 A J D 0 A 3 D Early type Main Pro...

Page 250: ...FF 1 E s I I APHICS CONTROlLER 31 K oo u1i r I GI u t 49 2S ISWl CH 6 ON Ii I I U96 ___ I I Gt 113 APHICS CONTROLLER fil K I n F 7 X I I 18 1 251 Ull2 1 4 7K IS i J 4 7K I 1 FLEXIBLE OISK DRIVE SWITCH...

Page 251: ...rd 10 of 14 9g 2 R DATU 2 f2 11 no u L ti DATA2 l U DATAJ 2 0ATA4 11 9 n T F1 7 DATA5 15 5 0ATA7 1 7 g I 2 5 9 74LSl4 2 U67 Fl U45 Fl ORVij LS2 1 BUSY 2 F2 18 I i 16 6 1 12 _____ 9 ____ 5 17 l 7US1 I...

Page 252: ...cs u cs i i cs 1 7 OSR 1 1 6 CTS 198CARR 19 RING 1 t t i l l 1 RXO 2 61 SERL1CS LSI 125 U37 SV l IR 0 _ 4c 1 C4 14 Cl 4 0l NC 12Y h0 1 1 NC NC NC NC sv Early type Main Processor Board 11 of 14 A 12 P1...

Page 253: ...2 RDI 2 s DACK PSI ll IS PSI TC J 19 WOA CLK 21 WCK 2l ROD 22 ROW JS ROV l4 WP TS 17 IOX 11 61 II lJ FLT RI l2Y Pll 1 L SI YENTiLATOR SPANNUNGSREGLER R2S 47l R26 R27 471 R29 121 R f 12 RJI SIi C7f llh...

Page 254: ...1 J3 I J4 I JS J6 a22 J1 a 21 J2 I J3 i J4 JS i J6 a 21 Jl a20 1 1 1 J2 I J3 J4j JS I J6 a 20 A12 Early type Main Processor Board 13 of 14 A 14 AU JI a 17 1 0 J2 J3 J4 JS J6 a 17 A15 I114 Al7 J3 I J4...

Page 255: ...XOI c 2 X07 0 c 31 XAI 4 0l 38 XAl 4 0l 29 XA 2 4 0l 28 XAl 4 Dl 27 u 4 0l 26 ML 4 0l 25 XAI 4 0l 24 XA7 4 0J 23 XU 4 DJ 22 XAt 4 0J 21 XA11 4 DJ 211 XAll 4 0l 19 u 2 01 18 XA1J 4 0l 17 XAl4 4 0l 16 X...

Page 256: ...L5245 111 74500 VLSI I a Y3 I 11 12 D D Jl9 L4 LS 74LS670 UI I L2 _ ___ _ _ _ _ J 1e D Ul2 U31 f I 25 5 U31 C31 U41 J 74508 u e l lT L _14_oa_ I 7407 Rt2 US7 1DIFLEx I C34 U4 1 IJ 7 504 RPII I C38 JI...

Page 257: ...7 47 19 42 83 119 1 15 12 20 10 48 14 7 84 120 156 13 28 14 49 14 7 85 121 1 17 14 8 14 50 14 7 86 122 158 15 14 7 51 14 7 87 123 159 16 16 8 52 20 10 BB 124 160 17 16 8 53 14 7 89 125 161 18 16 B 54...

Page 258: ...1 I 1 ABie 8 fESl AD2 4 us R07CTl AD3 l l A9 7 9 i A10 G 10 31 MN RX AD4 I Al1 11 R07t ml AD I A06 1111 A12 4 1 1 l RP2 AD7 A13 14 sv I 4 A14 4 7K ABB 8 AlS 1 A9 7 4 A16 1 A10 10 A17 17 II A18 I AU 12...

Page 259: ...gic Diagram HJCLIC 4 77 1 0 7 JPl r I 02 3o I J LAYOUTS AND SCHEMATICS 4 Alternate Mein Processor Board 3 of 14 A 19 r I 7 a 2 3 I U22 OEN 16 I 4 7K I I 1 I L BE J sv DEN 2 6 B PRDL cue 2 RESET 2 9 12...

Page 260: ...F2 JL_ _ IORB 9 Fl 6 6 tEfflB l U29 I 7 EPfU ISEL a 74502 7 2 II a I 607 5 618 121 1 1 Rni S 2 U51 3 6 18 1121 5 4 5 181121 r 74C l c BD4 516181121 i 4 P BOJ S 6181121 74502 U37 7 PI RAI 1 L re 1 74LS...

Page 261: ...2 RESET IN 13 XI 13 X2 QJ 24111 1 EPROM AO FE 2000 U7 STROBEl 1 6 AUTO FxDT l 1 9 4 INITl 1 6 J SCLINT _l_ _ _ J 4o JD022 DZ 7_____i t i L _1 _ 1I_ Jt 1 _ _ _ QD A TA 3 J2 10 J6 9 OATA4 J2 9 J6 II L 4...

Page 262: ...LIC0 SY 1 4 _7 IC 7 r I GATE 0 Th JGATE1 GATE 2 0 1 g 71 6 in U l I S 11 i lffl e t liffl l S t fT R TMTA g_ RPg 1 7 1LS74 q sv 1 a o s Q_ ic co u39 I oure I c R OUT I 13 OUT2 17 I 74508 l J U41 US6 U...

Page 263: ..._ 1 b lz_ _ _ 74LS32 1 8 LJ 6 L_J 7 I 2 56 4 PROI 3 cs 1 8 DAO e 1 1EM SEL 0 HEH SEL 1 c 6 14 16 17 11 n 14 I W G1 hs Ge nux 2 3 9 17 101 7 I I 1 9 6 L_ J 4 R6 8 330 13 14 cs U17 a 1 5 tA0 6 tAI 7 iA...

Page 264: ...h 1q 7 07 7 m EPROM CS1 Alternate Mein Processor Board 8 of 14 A 24 27128 A0 Al A2 A3 A4 AS A6 A7 AB A9 A10 All A12 A13 Ul4 l5GM I i nA D1 1 I 15 03 lk 04 OS 17 1A 07 a 6 HIPOL 4 7K 6 HIPO RD 0 1 1 4...

Page 265: ...R l 27 A1 1 11 l 11 RTS 3 BA2 A 2 RTS 32 13 t __ J2 21 JS 7 41 2 1 cs i SE RIAM L JFNL __Jl 0 f7 4 LS 1 2 i5 l 4 7VIC SY LI14 cs UI fGl SERIAL CS 9 I U34 Ji 8 _ 1 I p L _J OSR I 75154 CTS llll CARRIE...

Page 266: ...LAYOUTS AND SCHEMATICS 7 RAS 7 AS I 14 TPO SV Rl7 4 71 Logic Diagram Alternate Mein Processor Board 10 of 14 A 26 RA11 AOORESS 0 8...

Page 267: ...1 RP10 3 ROY Jl 30 4 7K lt i Jl 2S RPl0 R9 FE2188 Q 11 RO 1 e liE IIR DAQIN A 7 IICK 7 C 1 INTJN C c I CLK vco ROO 4 ROIi PS1 4 PS8 TtOUT IIDA t 7 OIOCOUT FRISTP l FLT TRO A RST IRl llf 40 INT WT l c...

Page 268: ...K 112 U3 8 18 Q e PEQUEST RFSH 19 AOSTl I 8 i1 e co ORO I y nAo 1 3 1 18 2A3 I 17 9 ORO l r s LEi co 2 17 RPtl 1 2 14 ORO 2 1 c 1 1 3 16 6 4 7k II C co ORO 3 oicKe 25 L J F 3 112 13 11 RESET 13 RESET...

Page 269: ...C78 R18 l 1 F J4 4 71 i Rl JVV 100111 w RESET IN0 12V 12V GND SV SV Ql 3906 SPKR HIPOL SV HIPO SW SV LAYOUTS AND SCHEMATICS 6 6 B SVr CRI C13 47 Fl IN4001 RS lMO R20 SV V f 4 71 12V OSC14 Alternate Ma...

Page 270: ...iV THERE ARE B EXF t NSION SLOTS IIITH THIS C0NFIGURATION JJ2 JJ9 SV t 1C1 9 10 11 14 34 J6 16 J6 IB J6 i B J6 i2 J6 i 4 IJ N c Jll 1 m 11 t1 Jll 3 fE QHAAEN Jll 5 Jll 11 Jll 13 Jll 15 Jll 17 ffi tiHl...

Page 271: ...i 1 1 017 0040411 1 t L MONITOR BOARD L ALPHA OISPL CONTR BOARD I I _ l 1 _ _ _ _1 I 017 0040329 MONITOR 017 0040329 f_J 017 0040060 I 11 1 I _j Ii I _ i _ P 51 _J 1 _ _ _ fft 1 i L L J I IJ I 1 I I...

Page 272: ...J I I r J GRAPHIC ADAPT BOARD I I I I i I 017 0040411 _ fl MONITOR BOARD I i l I 0 017 0040330 I L L i _ _J 1 I M I i L _tj _J i it 1 1 i o i I 1 s 1 KEYBOARD 1 t I I Tt 1 I tt i VOLUME r 41 _ r LJ _...

Page 273: ...C LAYOUTS AND SCHEMATICS FIX DISK C 3277 I LE J POWER SUPPLY 7 0040331 40332 Wiring Diagram 3 of 3...

Page 274: ...LAYOUTS AND SCHF MATICS Graphics Controller Board JS J3 J4 I J1 A 54...

Page 275: ...ller Board 1 of 5 S Cl l eJ 8Af 01 I OJ c 01 101 101 sv 5 0l ll LSI CRf CONIAOt LER 114S MAG MAil AEAO wlfiTr 1 CLK I U6 l ENBL MAI 1 REG SEI 1 MAI LIGHT PEN SIR08E 5 I II l REFRESH l II MA1 1 ACJ S l...

Page 276: ...1 11 12 1 IMS 211 tt I AJ n 1S MAT n 15 IK IA 11 l Al 11 u MAf u l AS l AS l A6 l AI lAT XAT ss J CT XAII XA7 XAII XA7 MATT MAt7 MAU MA ti aIS MATS MATS l AT MAU a 23 MAfl MATl a 17 MATJ MAU a 24 MAT1...

Page 277: ...LK ___ n 4 sv ruii I I lt JK I I I L _j MCCB MCC7 2 ct n CL IIEkJN TE 5 OSEO IJJIERNAt au _ LAYOUTS AND SCHEMATICS Graphics Controller Board 3 of 5 1 s o 4 81 4 CI 1 A1 4 81 AT S CI AT s ct 5 111 1 A1...

Page 278: ...i 4 01 SOR lc l l c _ BA I_ __ SY 1 037 l NC NC NC 1 1K L _J 1 ll_ S IA IVS 5 E l I 1 SZ _1 S El J _ _ _ a S E ll J____ Ill P 1 01 Cl o s o o s a 01 OOTCUC 11 b 9 UV Cll en ru is 11 L_ J 17y ru 1 t ly...

Page 279: ...raphics Controller Board 6 of 5 u s PAL Al Ill AASELI Ill CAS c 111 WINDOW _ I CCLK Ill 1 01 c Ill NC 111 ATL ltH o Ill s l Ill s a 071 c1 H S l NCJ _J RE Fal l 2 CJ CPUENI JI ClOSEO Pl ESSEY ISAMP O...

Page 280: ...D INTERNAT CHAR OPEN NORDIC CHAR 70 All MIT HCISSKLEBER FIXIERT FASTENED WITH HOT ADHESIVE LABEL SCHM 017 0040060 F AUFGEKLEBT GLUED 3 ITEM 77 GLUED ON SOLDERSIDE 2 NIGHT BESTUCKT C1 JP1 JP3 P2 NOT MO...

Page 281: ...2 Cl _ SL ll i 1 tc RGRT 4 D4 Al 2 4 9 NC JL NC NC L_ I c J CUR 4CO m _2 C UR S0R l Al l_ NC l C OISPEN S 7 OISEN L NC NC NC NC NC _ NC J NC 3 A3 Alpha Controller Board 1 of 4 IV v 1124 _ v 112 _ vu l...

Page 282: ...82 4 B2 VD7 XD7 XD7 VD6 XD6 X06 VOS xos xos V04 X04 xo VDl XOl X03 VD2 X02 X02 V01 XD1 xo vo XO XOI 2 C1 XD8 XD7 Alpha Controller Board 2 of 4 A 42 _83 _ DA T A_ G _AT E I 4 B2 l R r i A2 A3 A4 AS A6...

Page 283: ...lpha Control lar Board 3 of 4 II 17 15 IJ 1 81 ASC0 ASC7 J AJ 1 C2 c I Cl 1 C4 c H NT a RII 1 2K JP2 0 INlERN t T CHAR N _ z o c 1 1 2 C3 NC vv UNDERLINE XI X2 18 All SV ASCI ASCS ASC4 ASCJ ASC2 ASCI...

Page 284: ...5 4 8l AJ 4 83 Al B 11 MEMW MEMW 4 8l 4 8l A 31 Al A 28 3 1 B 12 MM NC A2 NC A1 NC A 4 83 NC 2_ 2 1l STATUSSEL i 1 1 NC J 04 1 C4 4 CJ CPIJM EL 2 Dl 4 Bl MEMR 2 81 2 82 4 83 2 02 4 84 E M W 9 a 11 1 s...

Page 285: ...1 HO SENSE J12 2 B c G N u 9 RA2 C34 S3 I SOPS 47K SI SOPO Jll 3 o oc GNO GND S2 2 RII RESERVED J11 5V 5V J5 7 DOD 0 000 SOPE 22M 47M J i 1 J2 I 3 25V 25V 12V r 12V 12V I 1 IC19 C 12V J2 2 GNO C3T C3...

Page 286: ...2 1511 W LED 51 CR51 JS 3 INDEX SENSOR GRAY 2 R51 150 MW cs1 CR52 lllllll p JS 4 BROWN 3 FLONT LED JS 5 BLUE 4 FPT SENSOR C32 JS 6 ll lM GND BLACK 5 J13 2 lSOPE JS 7 J13 1 so e DOD VIOLET 6 R54 2 2K J...

Page 287: ...D SCHEMATICS R111 31111 R121 R112 22K 15K c 147M R114 4 7K R113 R121 18K 22K R11512K R11812K Flexible Disk Drive 3 of BJ 5 R112 c 1 21 J 0 SV FPT LED INDEX LED 2 3 1 CONTROL R12S 1311 1 W R111 w W3 A...

Page 288: ...Control C102 R106 A118 33K r027K 75K C103r 6N1 R107 K 68K 4 SV Al 22KM w 11 FPT LED c101 Ol47I 122M 1HK A112 22M Flexible Disk Drive 4 of B A 48 C105 33M 25V r I 1 I A2 12Vlt I Al Alli 33 A113 Al A115...

Page 289: ...3 22M 16V C105 e 8 U101 7 _1_______ 0 __ 9 TA7259 6 R104 10 11M3512P 1 6K S R101 1 SK 11 12 13 14 3 2 4 V 4 u C E03 THS 113A 4 W C E01 THS 1113A R102 121 LED101 1113E LED102 19i13E R103 471 12V C101...

Page 290: ...0K 3 82K 3 VERSION TABLE U101 MS1728P 4 5 6 8 C102 0156J1 C104 10 947 C106 C105 R111 24K 47K 1NeP M C107 R109 R108 1 47M 47K 47K 13353 OR 133212 1332t5 D3442 R105 0 51K U102 MS51721L 2 3 4 5 6 8 R114...

Page 291: ...TROL 15532001 xx J12 W1 2 GND I 10 I 3 RD 6 j 4i _ 1 8 I I 6 1 F_M _______ 1 7 5V I INDEX SENSOR 1 1 FRONT LED FAT SENSOR 1 G_N D___ 1 g PCBAVFO OPT 15532010 xx J5 _ oo o____ 3 _ 1 _____________ 1_2_v...

Page 292: ...D SIDE 1 HEAD COMMON ERASE SHIELD COMMON ERASE SHIELD INUSE HEAD LOAD MOTOR ON DRIVE SELECT 0 DRIVE SELECT 1 DRIVE SELECT 2 DRIVE SELECT 3 DIRECTION IN STEP WRITE GATE A 52 Flexible Disk Drive 8 of 8...

Page 293: ...Ufl flD a i vu uo LD D D 0 11Yt SCLtCT J l Clll UCTC9 Gl1 t ULteT t o nt sntcr t tant uu r z IIC109 DI D1Ut 110 SU t T JtU we1 1 OAU uu 11Atl 00 w uc eouc lfAD D U s10r o11t sruc z r IUOT t1 u1 l D 10...

Page 294: ...0 2 a2L D2 O l i T IJ 111K I 010 i _ 0 7 07 lb v I D6 ______ 06 06 IS 6C D J O S 06 L_ o t a 03 03 1J 05 O 12 DC UNSAFE 8 D a 9 1 WFIITE FAULT 3K 13 05 OS I 1 ij L J I L lc l_ 17V 12VA T 511c 6 Ti B...

Page 295: ...C WRITE DATA E W cjg 6H RIWR o i 1 _ __ 26 31 32 LAYOUTS AND SCHEMATICS ____ OUT ENABLE WRITE FAULT DRIVE SELECT R2 v N 5 v l G ACTIVITY LED 5 R 1 5 w ACTIVITY LED F xed D sk Drive 2 of 2 A 66...

Page 296: ...D LJ I n eoe s Y ATICA1 CANE lJ Li DEFLECTION BOARD foN JalL _ l_ 1 CJIM ___ 911 Cl I con I IIIIClll NI ron VIDEO I I I Ch I I I L mn IOAlll 11 1 I L_ _ _ J U 1 A 11V t 4 I ao 01 ____ L en c t 11111 C...

Page 297: ...LAYOUTS AND SCHEMATICS Nonochro e Power Supply N 0 GNO o _ _____________ _ TJ 11 RII At4 RIO 10 D 28 C Jg CSI 12v SV O JA 0 25A C14 5 I HCA t2l A 57 NTC I TI R34 Pt R24 s S SINCR s 6 V 50 9 10 R4B C4...

Page 298: ...LAYOUTS AND SCH EMATICS Color CRT 8 Ill aa m iccz m o ii I a I 0 D L z i n _ er a r 1 m aa11C1 J A 58...

Page 299: ...MATICS Colar Pa er Supply 11111 11 e A 59 ff ftJ _ J _ _ J _ _ ____ __ H 1 1 _JL f J I crn i111u J 111 v b r 10on EllDII u ftl l j 4UII t S P tr 1r l A _ V uo jLi t r w 5 L9 0 p D P PO A i Do1J r 1111...

Page 300: ...48 4y t2 3 5 As 0 13 AT y L l SELENi 4 4 A D AU 1 15 5 3 At 0 1 15 ATC I 1 A D US A Tl 7 1 A D 17 AT7 SHT 5 6 I 23 A SHT s 9 2 RMA11 Ht A F i 1 5 SHT 4 CA CS CCLK I s e cs2 6 WE SHT 5 LS12 106 MC6845...

Page 301: ...2A 8 LSl2510 vcc 7 5 J BOOO I 12A LS125 i 7A l P1 R1 I 12A I 12t 11 I LS125 1J BA LSIJ8 JBO JBF II 13 IOR SHT 5 I OW SHT J 4 6 RESET SHT J 4 6 RESET SHT 6 LSCI e se SHT J 2 6845CS SHT 4 6845CS SHT J A...

Page 302: ...M LS 74 CURSOR 1 2 3 L J HSYNC DLY SHT 2 SHT 5 7 4 5 I I VSYNC DLY HSYNC 02 a 7 SHT 2 11 o a T SHT J 4 5 7 CURSOR DLY VSYNC I 13 0 12 SHT2 SHT2 1 o a 1s I DISPEN DLY 0 0 SHT 5 SHT 4 5 HCLK 9 I I 2 LSI...

Page 303: ...R DLV SHT 4 S H T 2 05 SHT 4 SHT I SHT 4 SOOTS SHT J iSHT J 4 RAJ m RAJ m SHT2 PENDLY 11 SHT 4 VCC SH L Cc C 5 _ _ _ _ _ _ _ _ _ _ SHT 4 OGEN SITO 1 1 SJ2 I I S86 SHT LSe 12C J1 LS24 RED GREEN I I ul...

Page 304: ...WEOil 2 MDJ 640COLOA I _ 6 __ 1 D O SHTJ SHT 3 5 6 P1 A31 c HT J f 5 c HT A SHT 4 HI 4 SHT 5 jl T J SHT 4 SHT 5 SHT 5 SHT 5 SHT 4 SHT 6 SHT 3 SHT4 fi 6845 LSJ74 DO D7 fl 33 D8 MA0 1 l I 12B 1 32 QI M...

Page 305: ...4 16 BD2 6 14 803 8 12 B04 11 9 BD5 13 7 BD6 15 5 B07 17 3 1G 2G y1 y14 LAYOUTS AND SCHEMATICS 90 LS37 CCII 3 D 0 2 CC1 4 D 0 5 CC2 7 D 0 6 CC3 8 D 0 9 CC4 13 D 0 12 ccs 14 D 0 15 CC6 17 D 0 16 CC7 1...

Page 306: ...6 CAS CC 1 4F LS86 1E SA D 9 Ls0 8 LS84 LS86 1 LS98 3 4 6 2 30 J CAS SF 5 __ LS84 3 4 69 84 NS PERIOO 14MHZ 7MHZ 2 J RAS 01 2A Si l t 13 586 4f 8 LS125 f l11 12b 11 Si l SA 1e 1 113 LS84 13 12 SA V 5...

Page 307: ...OJ E R 04 04 BB o J 13 05 05 1 1 2716 2732 c 11A 1 14 06 06 l J J 7 19 iJ oae 1 7 e l J B 1 11 07 07 16 J i n A9 07 tt f I 2 A 8 IA 08 0 8 19 5 23 A 8 06 15 2 9 CLR CLKCLR A7 os8 1 S1 L CCLATCH 11 1...

Page 308: ...t I 11 is 2 WE IE LS84 1 2 CPU MEM SEL t r 1 I 11 3 bcLK o CLR IF LS84 1 1 o GRPH vcc 8 AT LATCH SHTU SHT4 SHT 2 SHT 2 SHT J SHT 2 SHT 2 3 SHT 2 SHTJ IF LS94 d 0 READY P1 A18 MEMr COLOR SEL CO HCLK L...

Page 309: ...HT 3 4 5 6 1F Hl SHT6 H2 12 9 SE SHT 6 LCLK 11 8 SHT 4 12 12A vcc L5244 12 AJ HSYNC OLY 2 2K 03 05 BW2 02 SHT 5 vcc 40 50 SD 57 3 58MHZ 01 SHT4 2N3904 SHT 5 14MHZ 13 A7 33 J2 R6 51 RS HNI r 14MHZ i4 J...

Page 310: ...LAYOUTS AND SCHEMATICS Meaory Expansion Board UI 5 U10 Ul9 u u u ii N u u I u I u u t u u u N V V u A 70...

Page 311: ...EM0A I AI I CCA ION 51 1 51 2 51 l 51 4 KB ll2DKBI OH OH ON OH 121KB ll KBI OFF OH ON ON 192KB 1 IKBI ON OFF OH OH 256KB 15121 81 OFF OFF OH ON 201 8 1571KB I OH OH OFF ON l KB ll OKB I OFF ON OFF ON...

Page 312: ...YOUTS AND SCHEMATICS l Al MA0 MAS MU I CID MA1 MAI 13 II ti II MAJ 4A 1 BJ I At DB0 0B7 81 1 Al _ 1 111 J1 II U47 U48 Memory Expansion Board 2 of 4 A 72 U49 U50 U51 U52 U53 us U45 AF POUi 1 Cl l Ct 4...

Page 313: ...0 I Al _M A B_ M_A_B 1 1 1c10 MA7 I MAI au 82 L 1 1 A2 W r L 4 DBB DB7 1 82 UL f _ ___ of 1 A2 LAYOUTS AND SCHEMATICS U29 U3G U31 Memory Expansion Board 3 of 4 A 73 U32 U33 U34 U35 U36 AF 1 POUl U27...

Page 314: ...AND SCHEMATICS MA0 MAB l AI MU I CID 7 I MU 13 MAS MU II MAJ 11 MA7 I 87 RAS4 1 A2 CAS41 080 087 1 Cl Re AS S 4 I A2 5 5 1 x v J1 II U11 U12 Memory Expansion Board 4 of 4 A 74 U13 u1 U15 U16 U17 U18 1...

Page 315: ...1 0 LAYOUTS AND SCHENATICS DLC Inhouse I F Board LABEL SCHM 017 0042937 B AUFGEKLEBT GLUED 70 72 Label NOTE 2 A 75 NOTEU 75 74 81 78 View A 74 76...

Page 316: ...C3 1 D JOR 2 04 39 A6 25 31 2 04 AS 26 07 07 37 A 27 C 06 35 Al 28 05 35 Al 29 o 3 At 30 03 Al 33 Al 31 02 DI D 3 Bt ROM 11 2 C4 BIOR JOW MEO 1 04 2 81 I 2 C4 MWR 2 84 PCLKB RI IN INSTAT 810W 12 21 I...

Page 317: ...TSTART 4MSSTOP 5y Cl 3 4 B Hl IS 18 22 23 28 31 9 l F Rll 1K AOOROE C2 lnF DACK DACK 1 04 DACK 1 C2 BRST 1 Ct HO 0 2 C4 MWR 1 C4 1 D4 1 03 2 A4 2 84 1 C2 BRST ClS lnF I Cl BRST 1l 1 AI TSTOP 12 2 C4...

Page 318: ...2W 75451 1 12 R19 l1 GRD GRD TOM 13 75450 1 D2 U21 511 CR4 U21 Q 11 4 6 2 TB RIB 5111 CR3 KEY 5 C 5V R16 C14 12V R11 C11 15K 47pF C6 CR1 11l0K 11 1pF 11 1 2 12V R12 J2 T1 11 2 2K R6 7 4 R13 C21 1 7 R...

Page 319: ...LAYOUTS AND SCHEMATICS v daotax Adapter Board 106 107 os 02 I 104 102 A 79...

Page 320: ...T 15 RE 14 PMA y TPI 12 CSEU sv C1 S 8 11 14 16 18 27 J0 36 __ _ GRD Cll 4 7 IF 12V l 82 5 82 l 8l l 02 1 D4 l Ol R21 2 7k PUI 1 03 5 82 2 Cl T S 2 C1 1MHz Videotex Adapter Board 1 of 5 A 80 V PT8 V9...

Page 321: ...2 81 1 C1 1 CI DIAi D1A2 02AJ D3A4 DUS OSA6 D6A7 07AB 2 01 2 81 1 CI D8A9 D9A1d OIGA11 D11Al2 D12A13 013Al4 D1 A15 015A16 PUP3 2 6 PRS2LI 2 CS PBOEI 22 OE BWR 27 WR PMA1 PMA2 9 6264 PMA3 8 BKIIB PMA4...

Page 322: ..._2__ 1_ 02 c 5 Cl Adapter Board 3 of 5 g 6 WA ITFS HMlkH 01211S l 02 AJ TX 1 A2 1 5 02 5 Al 1 82 2 c J2 14 13 5 Cl l Al 01 A1S 015A16 BO l 7 1 e __ I 1 01 l lllll ll BAl1 2 BAI BAO 12 eo 806 805 eo 80...

Page 323: ...J AJ AS 1 92 sv 2 DI J o 08A9 D15A16 ETB R25 I DJ J D2 2 7k C12 07 11 tnF 01SA16 NC 1 A15 PMA1S 2 C1 EUR 02 D1JA14 PMA1 RJ2 RM 012A1J PMAIJ 75 D11A12 PMA12 DI A11 PMA11 sv D9AI PMAII R24 0SA9 PMA9 2...

Page 324: ...c lnF 1 F 21 C21 22lnF 1 CJ lpF J2 L1 4 NC 47 H 02 25 2 C1 R4 3 Ml 12V All 9 A11 1 2K Videotex Adapter Board 5 of 5 A 84 1MHz l Al B A 1 2 _ All l lk SY R4 Ilk CPI IIS1 U13 RXC AD OSR NC PU2 x1e 23 19...

Page 325: ...LAYOUTS AND SCHEMATICS Vidaotax Switchboard 1 1111 y A 85...

Page 326: ...1 7f H sv RS R1 2 7K 01 8 Pl 1 BTX Rlf IHK 2 RM RU 75 3 GM Rll 75 4 BM Rll 75 ii YNCI 9 GR0 11 NC IK 1 l 7 6 8 A 86 RI llf RI 47 Videotex Switchboard a 11 II l 11 II ICJ SOSHI ____ IC4 SOSNI ___ SV RI...

Page 327: ...FQ LLMNG BRIDGES ARE a NTAINED cx INECtoR P2 FROM P2 J TO P2 S FROMPl I TO P2 6 W LL PLUG Wiring Diagram Videotex 1 of 3 l 1 li1 11111 11 111 11 A 87 VOWME CXlUlO AOJUSJ __r BIIIGHlNtSS i j I o _NC _...

Page 328: ...1 fl l I 111 1 BTX ADAPT BOARD 1 f j 017 0040365 I 1 _ S IT II n I I L _ ___l fu li E u1 J I I 8088 CONTROLLER I I 017 0040439 I i I 1 ii n r I Ji I I I I I ISWITCH BOARD I f l LI GRAPHIC ADAPT BOARD...

Page 329: ...1 lGRD I 7 I O e sc 10 1 I LGRO I z 10 TK IDD 10 I 0 11 LGRQ 11 I I U 1 t w 12 Q LGRO 13 I I HS D u I LGRO IS I o i 1 I 17 L GAO 17 I 1D HS I 11 I u_ I 1 LGRO 11 19 I 20 INDEX Clo I 21 LGRO 01 22 ROY...

Page 330: ...LAYOUTS AND SCHEMATICS Keyboard CR9 GD a _ R6 r R2 RI 8 1 t 0 f A XI U2 u E J m j i _ _ _ _ __ I C1 T T c CR16 RS C5 Cl c 216 220 217 A 90 U6 U7 c t J Tc 7 4 232 233 221 222 223 s 6 3...

Page 331: ...U2 nu I nu IHI r GI r rN 1 e I l A W1 ITMI HSI HJS IIJI r I 1 NC I I l _j I 11 L L e _ II II C IL 0 E 1 CDL 14 F IS IS ___________ 1 1 1 IY f t L I s I 11 I I 11 II 11 in M E 11 l _ Cl I CU I I F IIGI...

Page 332: ...C C...