IBM 3278 Maintenance Information Download

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Summary of Contents for 3278

Page 1: ...i Maintenance Library 3278 Display Station Models 1 2 3 4 and 5 Maintenan ce Information SY27 2510 6...

Page 2: ...ssible that this material may contain reference to or information about IBM products machines and programs programming or services that are not announced in your country Such references or information...

Page 3: ...is contained in the IBM 3278 Display Station Parts Catalog order number S126 0020 Organization This publication has seven chapters Chapter 1 is a brief introduction to the 3278 and to the maintenance...

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Page 5: ...s 3 1 3 3 1 1 Test Mode 1 3 2 3 3 1 2 Test Mode 2 3 6 3 3 1 3 Test Mode 3 3 9 3 3 2 Online Tests 3 19 3 3 2 1 Requesting Online Tests 3 20 3 3 2 2 Test 0 Display Operation 3 22 3 3 2 3 Test 1 Error Lo...

Page 6: ...Indicator Card Assembly 6 9 6 5 5 Switches 6 9 6 6 OPtional Features 6 10 6 6 1 Audible Alarm 6 10 6 6 2 Security Keylock 6 10 6 7 Keyboard Units 6 10 6 7 1 Keyboard from Display Station 6 11 6 7 2 K...

Page 7: ...RT and CRT Frame Assembly 4 5 4 6 Card Locations D Type 4 6 4 7 Card Illustrations 4 8 4 8 Card Locations M Type 4 9 4 9 Card Illustrations M Type 4 11 4 10 Keyboard 4 12 4 11 Fuse Locations Low Volta...

Page 8: ...ded only when the capacitor is retained by its mounting spring The machine frame is grounded only when the prime power assembly 010 A1 is mounted and fastened in place The ferrotransformer assembly 01...

Page 9: ...icinity at all times b Rings wrist watches chains bracelets metal cuff links shall not be worn c Only insulated pliers and screwdrivers shall be used d Keep one hand in pocket e When using test instru...

Page 10: ...er personnel are not in a hazardous position 21 Maintain good housekeeping in area of machines while performing and after completing maintenance 22 Even though preventive measures are taken accidents...

Page 11: ...to keep tongue out of air passage 4 Pinch nostrils to prevent air leakage when you blow 5 Blow until you see chest rise 6 Remove your lips and allow lungs to empty 7 Listen for snoring and gurglings s...

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Page 13: ...d replaceable units FRUsl as shown in Figures and 2 Coax Timing and Control Base 3 E2 __ C a bl e__ Input Output Serdes Storage Storage Contro I MSR Card Magnetic Base 1 G2 Feature Logic Base 1 G2 Sel...

Page 14: ...or Pen Card G4 Selector Pen Slot Reader r RAM PS ECS Card RAM D2 E2 Timing Base 1 G2 Storage Control Feature Logic Character Generator Base 2 F2 Video Output H2 APL Text ROS Module Pluggable Module Fi...

Page 15: ...2 Interface to coax command decode and gates and paths to features Base card 2 01A A1F02 Storage counters and storage control Base card 3 01A A1E02 Character generator dot character line and row count...

Page 16: ...splay the 2 2 character plus space APL Text character set Be used to enter 94 EBCDIC characters and 81 APL specific characters plus space on the APL keyboard Be used to enter 94 U S English characters...

Page 17: ...ontrast intensity control see Figure 4 5 Yoke grounding clips see Figure 5 3 The brightness contrast assembly is grounded through a spring clip located behind the brightness assembly Verify this conne...

Page 18: ...ed from any online display station with a keyboard and may be run on any specified online terminal attached to the same control unit The results of the test are displayed at the requesting display sta...

Page 19: ...s the first probable cause of the failure the next card is the next probable cause etc 6 Always reseat the cards and their associated cables and test before swapping parts Reseat the cables and check...

Page 20: ...Write an X in each circle below for each light that wa on when the error occurred 0 2 0 s OK 0 S wm Machine 3276 Front o g 3276Conlrol Check Check Panel 0 0 0 6 If the keyboard is failing fill in the...

Page 21: ...a tion 01 A A1D02 Dl will have the selector pen card in location 01A A1E4 All references to the selector pen card for the D type will be location 01 AlA1C04 or 01 A A1E4 Caution The 3278 must be off b...

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Page 23: ...now take NO leg Y N 2 A Use the Error Log and Error Code to FRU list par 3_3 2 3 use the Symptom Repair List to aid you in developing your action plan A few examples are 1 Swap suspected FRU for examp...

Page 24: ...capacitor 5 Check coax connectors and electrical grounding as described in par 1 1 4 6 Contact FSC Branch Support for assistance Is one or more light emitting diode LED off 3 LEOs to left of screen Y...

Page 25: ...es or is out of sync moving or vibrating screen Action Reseat swap cards called out in this column Swap adjust card A1H2 where called out Ali logic cards are in the 01 A gate Hold the intensity contro...

Page 26: ...play size Reseat swap the high voltage changes when power supply See par 6 2 5 1 intensity is changed 9 Display ti Ited or Adjust the yoke or analog card incorrect size potentiometers See par 5 1 1 10...

Page 27: ...only 01A A1C2 0 Reseat swap RAM modules 01A A102 1M Reseat swap 01A A1C2 D2 0 Reseat swap 01A A1D2 E2 M 15 Test Mode 1 A1G2 characters 0 A1E2 incorrect 0 n A1F2 half or all of the screen or in incorre...

Page 28: ...at swap the keyboard logic keyboard card Check the keyboard PC mounting screws Check the keyboard cables See Figure 4 16 20 3278 cannot be Check logged online Run L Test 0 AA O to enable Security Key...

Page 29: ...AIA1H2 card is exchanged the adjustments must be verified It is possible for an adjustment to be in a position that may appear to be a failure Test mode 1 can be used to verify that the 01 AIA1H2 card...

Page 30: ...test mode use Y path if results are unexpected N 005 Is this a Feature failure7 Does not include keyboard N 006 Is this a subsystem indicated failure error code displayed or failures not detected by...

Page 31: ...2 for location N 014 Verify that the power on switch is on line power cable plugged in an active outlet and seated at the primary power box Are above conditions correct I nd ve 016 Switch unit off Ver...

Page 32: ...s Switch Unit On Did fuse s fail again N 021 Switch unit off Exchange 01 AIA1H2 card and adjust If fuse fails after new 01 AIA1H2 card is installed problem can be in high voltage power supply or yoke...

Page 33: ...able If reinstalling the keyboard cable causes the fuse to fail exchange the keyboard logic card Should exchanging of the keyboard card not repair the problem the keyboard should be exchanged 024 Repa...

Page 34: ...good exchange ferro 028 Verify DC voltages DC Common is at C3 minus on low voltage power supply Voltages are 10 except 8 See Figure 4 11 5 at fuse F6 8 5 at fuse F3 44 at fuse F5 5 at 010 PS1 J3 3 12...

Page 35: ...Disconnect keyboard cable at 01 AIA1G5 D or 01A A1F5 M Switch power on Verify failing voltage Is voltage still incorrect N 033 Replace keyboard logic card andlor keyboard cable I cables as required Re...

Page 36: ...e mask assembly see 6 5 Disconnect 01C A1Pl from 01C A1Jl See Fig 4 5 Switch unit on Verify 44 volts at 01 D PSl J3 1 Is voltage still incorrect N 038 Exchange Intensity Contrast Control see 6 5 3 Rei...

Page 37: ...om main power box P1 Verify resistance from pin B to pin C of line power cable socket J 1 See Figure 4 12 Measures 5 ohms or more1 f 2 Exchange line power cable and test for correct operation 043 Remo...

Page 38: ...46 Exchange prime power asm Figure 4 3 Test for proper operation 047 Exchange Ferro Transformer Verify correct operation 048 Exchange fuse F1 in main power box Switch Unit On and wait up to 30 sec Did...

Page 39: ...d fuse F1 fail again I 52 Exchange low voltage power supply Verify correct operation 053 Exchange ferro transformer Verify correct operation 054 Exchange main power box Reconnect and verify correct op...

Page 40: ...witch unit off Exchange the High Voltage power supply Switch Unit On and verify correct operation Is light 2 ON7 N 059 Switch unit off Exchange and adjust the 01 AIA1H2 card Verify correct operation I...

Page 41: ...A A 1 2 I 063 MAP 01 Terminal Failure MAP PAGE 13 OF 13 Exchange and adjust card 01 AIA1H2 Verify correct operation SY27 2510 6 1 81 2 01 13...

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Page 43: ...2 0 15 088 EXIT POINTS EXIT THIS MAP TO PAGE STEP MAP ENTRY NUMBER NUMBER NUMBER POINT 1 002 01 A 18 108 g A 1 004 A 19 113 05 A 001 Entry Point A Are all three lights 1 2 and 3 See Fig 4 1 for locati...

Page 44: ...UseN path if no display or raster on screen or flashing on and off or erratic N 006 Is there a normal divider line on the screen 1 7 IGo to Page 5 Step 028 Entry Point B 008 Is there a normal cursor...

Page 45: ...nnectors from analog card to intensity control potentiometer Figure 4 13 3 Intensity control potentiometer 4 Intensity override switch Spring loaded 5 Possible short circuited CRT 6 Reconnect coax sig...

Page 46: ...s Verify correct operation 020 Exchange and adjust 01 AlA1H2 card Problem still there7 r 1 Reconnect coax signal cable feature card s Test for proper operation 022 Exchange High Voltage power supply...

Page 47: ...Test for proper operation 027 Exchange High Voltage power supply Reconnect coax signal cable feature card s Verify correct operation 028 Entry Point B Use the intensity override control to force a di...

Page 48: ...1H2 card Is problem still present I 34 Reconnect coax signal cable feature card s Test for proper operation 035 Observe the neck of the CRT to see if a light from the filament is visible Remove cone s...

Page 49: ...Exchange CRT Do alignment procedure Reconnect coax signal cable feature card s Verify correct operation 041 Test for short in cable from Low Voltage power supply to CRT socket Remove plug J2 from Low...

Page 50: ...open wire from J2 3 to CRT socket pin 1 and for an open between J2 9 to CRT socket pin 14 Figure 4 12 Repair or exchange cable if open If cable tests good exchange the CRT Reconnect coax signal cable...

Page 51: ...E2 0 or 01 A A1H2 G2 F2 M card Reconnect coax signal cable feature card s Verify correct operation 048 Exchange 01A A1G2 F2 card 0 or 01A A1F2 G2 M Is problem still present r Reconnect coax signal ca...

Page 52: ...for ON Full clockwise if feature is installed Was the security key in the correct position If the security key is not installed use the Y path 1 1 W N 058 Switch key to ON Full clockwise Has the probl...

Page 53: ...econnect coax signal cable feature card s Test for proper operation Problem still present l End of call 065 Exchange 01 A A1H2 card and adjust Test for proper operation 066 Entry Point C Put the Test...

Page 54: ...ay correctly adjusted N 070 Use adjustment procedure for 01 AIA1H2 card and yoke_ Chapter 5_2 _ Reconnect coax signal cable feature card s Verify correct operation_ 071 Exchange 01 AIA1F2 E2 or G2 0 o...

Page 55: ...es with another terminal to ensure that the problem follows 075 Is the cursor and divider line the only display on the screen N 076 Is the Test Pattern displayed y N 077 Exchange cards 01 AIA1G2 F2 E2...

Page 56: ...card s Verify correct operation 081 Does the intensity and contrast control work correctly 1 5 A D N 082 Exchange 01 AlA1H2 01 AlA1F2 card Has the problem been corrected N 083 Use Figure 4 13 to isola...

Page 57: ...t 1 87 Reconnect coax signal cable feature card s Verify correct operation 088 Entry Point D See Figure 4 13 to verify switch and cable to logic Repair or exchange Reconnect coax signal cable feature...

Page 58: ...racters readable but some all missing or wrong N 093 Exchange 01 A A1G2 0 or 01 A A1G2 F2 card M Reconnect coax signal cable feature card s Verify correct operation Problem corrected 1 h geOIA AIH2 d...

Page 59: ...to 01A A1H2G13 Repair or exchange Reconnect coax signal cable feature card s Verify correct operation 099 Exchange 01 A A1G2 card Reconnect coax signal cable feature card s Verify correct operation Pr...

Page 60: ...e card by exchanging one card at a time Reconnect coax signal cable feature card s Verify correct operation 105 Exchange 01 AIA1F2 01 AIA1G2 01 AIA1E2 D or alAIA1F2 G2 M Reconnect coax signal cable fe...

Page 61: ...communicating with other terminals I 10 Use controller Maintenance Information Manual to locate cause of problem 111 Put test normal switch in normal position Exchange 01A A1G2 01A A1F2 01A A1E2 D or...

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Page 63: ...oken worn or clicker sound failing N 002 Use Test Mode 2 to verify failing key or keys Is there more than one key failing N 003 Does any character enter from the failing key N 004 Does the cursor move...

Page 64: ...o isolate a failing cable or connector Verify using Test Mode 007 Verify seating of keyboard cable connector to the terminal Verify internal keyboard cable connector to logic gate See Figure 4 16 If p...

Page 65: ...ing of cable connectors exchange the keyboard logic card Insert the keyboard 1 0 jumpers ensuring that the new logic card is jumpered the same as the card exchanged If exchange of the keyboard logic c...

Page 66: ...er sound N 016 Exchange logic card 01 A A1G2 Dl or 01A A1F2 M Is trouble still present r 17 IEnd of call 018 Exchange the clicker See keyboard Repair Section for exchangement See Chapter 6 7 Verify co...

Page 67: ...cards N 002 Exchange 01 AIA1G2 0 or 01 AIA1G2 F2 M Reconnect coax signal cable Verify correct operation 003 NOTE The PS Feature Card is driven by the ECS card The ECS card must be plugged in to test...

Page 68: ...N then MSR ECS APL TEXT and PS until the problem occurs again Did the selector pen feature card cause the problem N 006 Did the MSR feature card cause the problem N 007 Did the ECS TEXT feature card c...

Page 69: ...intermittant Reconnect the coax signal cable and test for proper operation 012 Go to Page 15 Step 072 Entry Point G 013 Go to Page 15 Step 072 Entry Point H 014 Go to Page 5 Step 028 Entry Point J 015...

Page 70: ...Reconnect coax signal cable Verify correct operation 019 Is this a failure of the MSR feature N 020 Is this a failure of the selector pen feature 1 1 N 021 Is this a failure of the ECS TEXT APL featu...

Page 71: ...Page 15 Step 072 Entry Point H 028 Entry Point J Go to Entry Point D to verify switch settings on ECS Feature Card Are switch settings correct N 029 Set switches Verify proper operation using on line...

Page 72: ...ngs Verify proper operation using on line test described in 3 3 2 1 Routine 8 Return to customer 033 Return to customer 034 Is trouble with fonts C O and or E F only or don t know 7 T N 035 Remove plu...

Page 73: ...ettings Verify proper operation using on line test described in 3 3 2 1 037 Return to customer 038 Exchange pluggable module for font causing trouble Verify proper operation using on line test describ...

Page 74: ...AM 11 IF 3 RAMS 5 6 7 8 ID for ECS Card RSS 0000 for APL TEXT ROS 1111 for Indicator ROS Note The APL Text ROS module may be present if the APL Text feature has been removed via MES In this case set s...

Page 75: ...See Section 3 3 2 2 Is trouble still present I I Return to customer 044 Go to Step 045 Entry Point F 045 Entry Point F Switch power off REmove card 01 AIA1002 0 or 01 AIA1E2 M Remove pluggable module...

Page 76: ...turn to customer 048 Go to Page 14 Step 064 Entry Point B 049 Entry Point C Verify with customer that the MSR Short jumper or extension cable if used and test card PN 1742659 operate correctly on anot...

Page 77: ...trace voltage from logic card to MSR connector 052 Exchange fuse Switch Unit On Are any lights on the MSR on7 N 053 Switch unit off Verify fuse at 01C Fl Did fuse fail again7 N 054 Verify voltages at...

Page 78: ...C4 M read in test card again If yellow light does not light verify cables from logic gate to MSR connector See Fig 4 15 059 Put the Test Normal switch Verify correct operation by described in section...

Page 79: ...MAP PAGE 13 OF 15 Exchange logic card 01 AIA 1G02 perform test for MSR as described in 3 3 2 2 If trouble persists verify cable from logic gate to MSR connector See Fig 4 15 062 Return to customer 063...

Page 80: ...volts at 01 AIA1C2U09 01 AIA1E2U09 0 or use 01A A1G2U09 M Verify 12 volts at 01 AIA1C2S0S 01 AIA1E2S0S 0 or use 01 AIA1G2S0S M Are voltages correct N 067 Exchange card 01 AIA1H02 Reconnect coax signa...

Page 81: ...o isolate problem 01A A1H2J5 connects to 01A A1G2J5 D or 01 A A1F2J5 M Alarm should sound when G2J5 D or F2J5 M is grounded 2 sec Verify audible alarm control setting if alarm does not sound Exchange...

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Page 83: ...O PAGE STEP MAP ENTRY NUMBER NUMBER NUMBER POINT 6 037 g A 4 020 A 6 035 04 A 001 Entry Point AI Does the indicator row on the screen display an error code N 002 Are there any characters or symbols di...

Page 84: ...rmine if this terminal has had errors that cause the control unit to disable this terminal Has this terminal been logged off by the control unit See error log codes 3 3 2 3 for log off codes N 008 NO...

Page 85: ...connector or defect at the controller Coax resistance is 30 ohm 1Ooo feet Repair or exchange 013 The following is a test from the coax connector on the terminal to card 01 A A1G2 Test the resistance...

Page 86: ...he terminal logged off because of errors See error log codes 3 3 2 3 for log off codes N 018 Does this Terminal contain feature cards 1 19 Exchange card 01 AIA1G2 Verify correct operation 020 Go To Ma...

Page 87: ...the feature is not identified or this terminal does not have features exchange 01A A1G2 card Is the problem still present r 25 IEnd of call 026 Exchange 01AIAl F2 E2 D or 01AIAl F2 M Verify correct o...

Page 88: ...Page 4 Step 021 Entry Point C 032 Go to Page 2 Step 007 Entry Point B 033 Is Error Code other than 41 42 210 or 212 N 034 Remove feature cards if present Is problem still present I 35 IGo To Map 04 En...

Page 89: ...ard cable to Terminal Exchange feature cards Verify correct operation Is problem still present I of 040 Exchange internal coax cable between card gate in II 0 connector panel 01 S1IJ4 see Figure 4 4 V...

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Page 91: ...pter 4 3 3 Operation Tests Operation tests are used to sense failures both for problem determination and for repair verification Both offline and online tests are available 3 3 1 Offline Tests The 327...

Page 92: ...display with pattern of characters shown in Figure Pattern Display 3 1 3 2 or 3 3 Compare th e test pattern lines shown in the figure with the corresponding lines on the Mode Entry Set Aa A to Aa scre...

Page 93: ...STUVWXYz sAC O 2i45b7 1 7 S4t l I Divider Op Inf Area oi23 i i 1 I I P 012345b78qB ue _II VA Line Test Pattern for Models 2 n _ 0 0 J _ V Line 1 e ouae ouae ounA luUA YAEEIOUYCAEIOUAEI UA luUNabcdefgh...

Page 94: ...or Models 2 3 4 and 5 Divider Line Line 1 I t 1 II t It1 13 IJ D l J 7 I U 1I ABCDEF HIJKLt1NOPQRSTUVWXYZ V Line 2 ABCDEFGHIJKLMNOPQRSTUVWXYZ Ii IA J o12345b7 l II 4 R 912345E 78CW 1 _ Op Inf Area 6i...

Page 95: ...b7 S4t I J 6 23 o5b7 1 I t r 01 2345b 7 Sqf l _I o v A_ C Divider Line T t iI J t7 4 f1 13 JII 0 0 0 r H IlI 13 llabcdef II h i jk I mnopq r 5 tuvwxyz 4 1i1i 1 ABCDEFGHIJKLMNOPQRSTUVWXYZ 0AC O 2345bT...

Page 96: ...isplayed in Test Mode 1 beginning at top left of display This is a test of keyboard scan codes Note Regardless of the characters that appear on the key tops the characters displayed are those shown in...

Page 97: ...1 beginning at top left of display This is a test of keyboard scan codes Note Regardless of the characters that appear on the key tops the characters displayed are those shown in the Control key ____...

Page 98: ...left of display This is a test of keyboard scan codes Note Regardless of the characters that appear on the key tops the characters displayed are those shown in the dia Control key ______________ J gra...

Page 99: ...entify keyboard keys by the characters that appear on the keytops Suggested Logic Area Test Sequence 2 Press C key Characters keyed in during Test Mode 2 are replaced by Test Mode 1 Press Control key...

Page 100: ...with Numeric Lock APL Katakana Text Text with Numeric Lock PS or Typewriter Attribute Select APL Attribute Select Result A character dependent upon the display model and keyboard type see table below...

Page 101: ...pressing 0 as desired Clears status A character dependent upon security see table below appears in first posi area Monocase Switch A a A 0 A Q 1 B Clears status Test Mode 1 pattern remains displayed F...

Page 102: ...Test Mode 3 are identified by the diagram shown for Test Mode 2 Do not identify keyboard keys by the characters that appear on the keytops First position of operator information area is loaded with th...

Page 103: ...n it will move under same character as on key that is pressed except for uppercase characters displayed in the top rowl Press any keys except Control key I Cursor moves many positions with each key de...

Page 104: ...apostrophe Blink cursor Normal cursor Space key Inhibit cursor Inhibit display Change from 132 to so character length Model 5 only Press Control key then C key then Control key Press B key twice then...

Page 105: ...ress 0 alpha key Prepares for testing display intensitY control Press I alpha key All characters on screen display with high intensity Press Control key then B key twice except operator information ar...

Page 106: ...ss and hold 2 key until 2 s appear in top line D type Press and hold 3 key until 3 s appear in top line M type Press and hold 4 key to enter eight to ten 4 s D type Result Power On Reset occurs All po...

Page 107: ...to enter eight to ten 9 s M type Press Control key press B key twice then Control key Press W key Press key Press Control key Press B key twice then Control key Press S key Press 2 key Cursor moves b...

Page 108: ...forward to first 8 entered D type Press 9 key Cursor moves forward to first 9 entered M type This concludes tests that can be performed by the Offline Test Test Model Display station features must be...

Page 109: ...the requesting display station Eight online tests can be selected Test 0 Test 1 Test 2 Test 3 Test 4 Test 5 Test 6 Display Operation Error Log Display Error Log Erase for 3274 erases error log for sel...

Page 110: ...tation to be tested must not be in session if SNA and not in WAIT state if BSC Objective Activity Result 1 Start test Press and hold ALT strike TEST and then release Display is cleared both keys TEST...

Page 111: ...s Reset re enter test format Invoking message is retained and is suffixed with or 0 where succeeded and these may be failed prefixed by a 0 device power off routine number Press and hold ALT and strik...

Page 112: ...est a POR response 3276 only Routine 3 Permit operator testing of selector pen and Interactive Test keyboard functions Display only Display test pattern not for printer Sound audible alarm if feature...

Page 113: ...sity protected and selector pen detectable fields Non display field with NON preceding normal intensity and protected field DISPLA Y INSERT If blanking circuits on analog card fail NON can be seen CK...

Page 114: ...isplays in operator info area 7 A is erased hold ALT strike TEST release ALT Test pattern is erased TEST is erased Test is ended 8 If selector pen is a feature a Touch pen on SEL PEN SEL PEN SEL PEN d...

Page 115: ...ALT and press TEST to end test 11 lf PS feature a Request online test 8 by following procedure in 3 3 21 step 2 if already in test mode or steps 1 and 2 if not in online test mode b Verify symbols on...

Page 116: ...tation 3274 Error Log Line TY1 Displays the most current low order digits of the 200 300 400 and 500 Coax port address 00 31 series nnn numbers 200 leftmost to 500 rightmost Line 2 22 33 445 5 Display...

Page 117: ...s seen in log of another terminal 12 Invalid Scan Code received 03 Feature bus error 22 Invalid Selector Pen Status or 04 Storage error Command Q failure Unsupported feature attached 23 ECS buffer par...

Page 118: ...v I E ror code XO Xl X2 X3 X4 X5 X6 X7 X8 X9 XA XB Error code h g order I OX XX XX XX XX I low order dIgIt dIgIt where lX XX XX 2X 3X 4X 9X XX XX XX XX XX 03 Example Error code 42 keyboard overrun has...

Page 119: ...ture timeout 77 Device Check terminal buffer parity OA Total count of error code 70 OB Total count of adapter Receive parity Refer to the control unit manuals for definitions of other error codes Exam...

Page 120: ...led The leftmost symbol is PS A the rightmost is PS F A dot is displayed if the PS storage is not installed Line 7 COLOR is underscored Lines 10 11 and 12 Symbols A B and A respectively are displayed...

Page 121: ...0 01A A1F2 M 44 01A A1C4 01A A1E4 01A A1G2 0 01A A1G4 01A A1G2 M 6001 A Al B4 01 A A1G2 MSR 61 01A A1C4 01A A1E4 01A A1G2 0 01A A1B4 01A A1G2 M 10 Keyboard 10 jumpers 1101A A1G2 01 01A A1F2 G2 M 12 01...

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Page 123: ...mode displ ys test panern _ on Off I t Audible Alarm Volume Control j Econtr stControl Ready Symbol first position of oper tor ______ 1f i it Security Keylock On Off Switch information area BI 3274 3...

Page 124: ...st pattern Audible Alarm Volume Control On Off Switch f I r H j contrastControl Ready Symbol first position of operator jJ Secunty Keylock information area Bl 3274 3276 or other symbol Brightness Cont...

Page 125: ...42 J1 AFE 50 Hz Hi 8715343 II EMEA 50 Hz Hi 4119686 J2 N IJ Capacitor 6814311 J I I T U01D C1 IJ Prime Power Asm 1743110 0 cb J3 D Primary Fuse F1 US Canada 1149561 EMEA AFE 60 Hz Lo 1149561 J4 AFE 50...

Page 126: ...n 01Sl J2 Figure 4 4 Upper Frame Gate Asm 01A Al Key I Description High Voltage Asm Fuse MSRl Audible Alarm Selector Pen Asm Models 1 and 2 Models 3 4 and 5 _ _IIAudible Alarm Asm rt _ Row 2 01e DSl P...

Page 127: ...fJ a bl A1S3 Cl 61 iia Figure 4 5 CRT and CRT Frame Assembly Key II iii D Description PN Intensity Pot Intensity Override CRT 1655349 Security Key Lock 5214866 CRT Socket 1743041...

Page 128: ...op card Connectors without PS Installed A H Raster Blanking Height 132 Width 132 Width 80 Top Margin Test Points Character Height Row Space Figure 4 6 Part 1 of 21 Card Locations 0 Type 4 6 SY27 2510...

Page 129: ...Card 3 MSR Magnetic Slot Reader Card ECS Extended Character Set Card PS Programmed Symbols Note for CE jumper If no SP card use male jumper for test_ Top Card Connector TeC f 7IF2toG2 1742982 05toF5 I...

Page 130: ...3 IJ Switch No 1 Note RAMs C D E and F are pluggable PS Carll Selector Pen Card APLIText ROS Models 1 2 and 3 5643710 Models 4 and 5 5645546 Indicator ROS All Models 5666701 B ECSCard Figure 4 7 Card...

Page 131: ...Raster Blanking Height 132 Width 132 Width 80 Top Margin Test Points Character Height Row Space Figure 4 8 Part 1 of 2 Card locations M Type SY27 2510 S 1 81 4 9...

Page 132: ...Pen Card MSR Magnetic Slot Reader Card ECS Extended Character Set Card Note for CE jumper If no SP card use male jumper for test Top Card Connector TCC 71 I IF3toG3 I IE2toF2 I F4 to G4 IL__ 1743323 1...

Page 133: ...Base Card 1 Base Card 2 Figure 4 9 Card Illustrations 1M Type SY27 2510 6 1 81 4 11...

Page 134: ...h Numeric Lock 0 1 2 1 2 2 3 2 3 1 3 0 2 PS or Typewriter Attribute nS a a 0 a 1 0 a 2 0 a 3 a ID Jumper Block Keyboard Conn Logic Card Asm 75 or 76 key PN 5188718 87 or 88 key PN 1752631 Clicker Asm...

Page 135: ...Low Voltage Power Supply J4 fo70401 10805021 9 2 OJ6 8 P OJ7 P5 0 _ C4 44 I 18 C6 0 44 _ Fuses F1 Voltage 6 3 12 8 5 F5 44 F6 5 Slip On Conn to Ferro PN 303549 111261 338165 855253 2130253 Voltages at...

Page 136: ...2 P12 8 5 V 8 01A A1 H2 P10 12 V en e 01 AIA 1 H2 J2 8 0 V 0 Ferro N transformer J3 P3 To N Cord Prime 2 01A A1 H2 P3 5 V en P4 J4 Logic 5 Q Power Gate 61 8 01D A1 3 01A A1 H2 P6 5 V 6 Low 4 01 AIA 1...

Page 137: ...al Test ____ 01 A A1H2G05 B 01 A A1H2G02 01A A1H2P08 Control _ r C S5 1 2 Test Override Switch R2 Intensity Control 01C A1 under bezel 5 9 4 8 7 Blank 2 11 J1 P1 01A A1H2J9 01A A1H2G11 01C DS1A1 1 4 0...

Page 138: ...06 B6 B02 003 84 01D PS1 P2 H2 400 from PS Focus 44 to HVPS HVPS Return Disable Note Pl Pin 2 is blank 01C Bl Sl 01A A1H2 Security Key Lock 01C DSl Audible Alarm 01C A1Al P1 1 Indicator 3 Asm 6 7 8 N...

Page 139: ...DC Return 25 MSR Fuse 01S1 J2 DC Return V Coax Shield I I Sel Pen Sw NC White to Sel Pen Signal Coax Sel Pen Sw NO Yel 6 2 Vdc Black 12 6 Vdc Red Amplifier Card MSR To Selector Pen C5 or E5 D 01Sl J4...

Page 140: ...Scan Bit 4 Scan Bit 6 Scan Bit 2 S KB Ack Internal Keyboard Connecto r B09 B13 013 003 002 KB Ident Bit 0 004 Clicker B03 KB Ident Bit 1 005 Make Break B12 S KB Ident Bit 3 B06 010 8 SV Scan Bit 1 Bl...

Page 141: ...5 A1Al DC RET 44 ENABLE FOCUS 400 01A A1H2 M 10 11 12 13 10 11 12 13 10 11 12 13 5 5 TO KEYBOARD DC RET 8 5 Figure 4 17 DC Power Distribution SY27 2510 6 01A A1G2 U S 0 0 0 0 0 0 g 0 0 0 0 0 0 0 0 0...

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Page 143: ...see Figure 5 2 In either case the CRT cone shield must be removed before the adjustment is made 5 1 1 Remove Cone Shield To remove the cone shield do the following after removing the top and side cov...

Page 144: ...l0ltage Power Supply _ Focus Potentiometer I e Figure 5 1 CRT and High Voltage Power Supply Centering Rings Figure 5 2 Yoke Adjustments Grounding Clip Spring tension must cut into yoke core insulation...

Page 145: ...the analog card see Figure 4 6 which may need ad justment when the analog card is swapped or at other times Check the conditions described in the first paragraph of this chapter before continuing I No...

Page 146: ...t control fully clockwise the con trast between the high intensity and normal intensity fields is maximum The normal intensity fields may not display if intensity is set at a low level Set the contras...

Page 147: ...an 48 V with jumper connected to pin J6 1 Switch off the 3278 2 Connect the jumper to pin J7 3 Switch on the 3278 4 Measure the voltage at fuse 5 to dc return 5 If the voltage is between 44 and 48 V t...

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Page 149: ...The WTC side covers use a rear retainer spring that prevents movement of the front pin Release the spring by using a screwdriver on the spring 3 Top rear cover The top rear cover can be re moved only...

Page 150: ...ide it back on the wire leads 3 Pull the two leads from the capacitor terminals 4 Pull the capacitor from the spring holder 5 Reinstall in the reverse sequence This capacitor has no polarity 6 2 3 Pri...

Page 151: ...insulated jumper wire ground the CRT anode terminal to discharge static charge Carefully disconnect the CRT anode lead static charge may be present 2 Disconnect the input cable at the lower edge of t...

Page 152: ...taneously at the top and bottom until the card disengages Exchanging Open both extractor levers fully Insert the card holder tracks into the front guide fingers card components towards hinge Push in u...

Page 153: ...2 at the top and the arrows pointing upward 6 Reinstall the mounting hardware and ensure that the card holders are equally centered in the gate opening then tighten the screws and reinstall the cabli...

Page 154: ...e the yoke ground wire from the CRT bell ground strap 11 Loosen the yoke clamp screw slide the yoke assembly off the CRT and place it on the upper frame 12 Open the new CRT container and place the pad...

Page 155: ...Disconnect the yoke cable from the gate and disconnect the ground wire s from the CRT bell ground strap 2 Cut the yoke cable fasteners on the logic gate and support Disconnect the CRT socket ground l...

Page 156: ...e centering magnet assembly by lifting the four plastic tabs and install them on the new yoke with the same orientation that they had on the old yoke Caution Ensure that the centering magnet assembly...

Page 157: ...er clamp from the cable clamp 2 Press the plastic catch at the rear of the switch to one side and pull the switch out 6 5 3 Intensity and Contrast Controls 1 Pull off the two knobs and spacer or the a...

Page 158: ...ove the keylock assembly cover 3 Remove the cable leads from the switch with pliers or with a small screwdriver Note the terminals from which the leads are removed for later connection 4 Remove the ca...

Page 159: ...cover off the keyboard 5 Reinstall in the reverse sequence Note Check for cover clearance around the keys after the cover has been reinstalled Adjust if required 6 7 3 Keyboard Assembly from Base 1 S...

Page 160: ...clean during work on the keyboard Any particle between the key module flyplate and the printed circuit is a possible problem 1 Switch off power 2 Disconnect the keyboard from the display sta tion See...

Page 161: ...6 7 6 2 Key Module Replacement 1 Ensure that the alignment tab and the angled key stem are in the same position as those of the other modules in the all keys assembly 2 Install the new module PN 17481...

Page 162: ...ny pivots removed in step 2 above into the mounting frame 2 Place the spacebar button on its modules and lower it into position while engaging the bar in the two pivots 3 Press down on the spacebar at...

Page 163: ...s on the card area 6 Reinstall in the reverse sequence Note Check that the keyboard ID jumpers on the new logic card are in the same positions as on the old logic card See Figure 4 10 6 8 Selector Pen...

Page 164: ......

Page 165: ...he MHS is a hand held device whose com ponents are also packaged in a plastic housing The repair and maintenance of both devices is a customer responsibility Neither device may read magnetic stripes a...

Page 166: ......

Page 167: ...event writing on the screen Clicker An assembly that when enabled generates a small sound when a key on the eyboard is pressed The sound indicates to the operator that the keyboard has recognized the...

Page 168: ...sk The frame surrounding the display screen See Figure 4 5 Neck The narrow portion of the CRT between the bell and the CRT socket See Figure 5 1 Prime The compartment where the power cord is attached...

Page 169: ......

Page 170: ...ion 1133 Westchester Avenue White Plains N Y 10604 IBM World Trade Americas Far East Corporalion Printed in U S A Town of Mount Pleasant Route 9 North Tarrytown N Y U S A 10591 IBM World Trade Europe...

Page 171: ...gest additions and deletions and list specific errors and omissions give page numbers All comments and suggestions become the property of I BM If you want a reply be sure to give your name and address...

Page 172: ...CLASS PERMIT NO 40 ARMONK NEW YORK POSTAGE WILL BE PAID BY ADDRESSEE International Business Machines Corporation Department 52Q Neighborhood Road Kingston New York 1 2401 _ _ _ _ t NO POSTAGE NECESSA...

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IBM 3278, Maintenance Information

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