IBM 5251 11 Maintenance Information Manual Download

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Summary of Contents for 5251 11

Page 1: ... SY31 0461 0 IBM 5250 Information Display System IBM 5251 Display Station Model 11 Maintenance Information Manual ...

Page 2: ... SY31 0461 0 IBM 5250 Information Display System IBM 5251 Display Station Model 11 Maintenance Information Manual ...

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Page 4: ...7 Preface Related Publications Related information can be found in the following manuals IIBM 5250 Information Display System Installation Manual Physical Planning GA21 9277 IBM 5250 Display System Reference Card GX21 9249 IBM 5251 Display Station Operator s Guide GA21 9248 IBM 5251 Display Station Setup Procedures GA21 9286 IBM 5251 Model 11 Display Station Maintenance Analysis Procedures SY31 05...

Page 5: ...s Line voltage is present at the power supply and the dis play assembly High voltage is present at the cathode ray tube The cathode ray tube could implode if it is hit or dropped The green wire in the display assembly is not at ground voltage vi Safety ...

Page 6: ...nance restore all safety devices such as guards shields signs and grounding wires 12 Each Customer Engineer is responsible to be certain that no action on his part renders products unsafe or exposes customer personnel to hazards 13 Place removed machine covers in a safe out of the way place where no one can trip over them 14 Ensure that all machine covers are in place before returning machine to c...

Page 7: ...assembly 132 Cleaning 133 Key Module Removal Installation 134 Spacebar Removal Installation 135 Flyplate Replacement 136 Keyboard 10 Mini MAP Conditions After Power On Service Aids Tools 137 Keyboard Scan Code Mini MAP Conditions After Power On Service Aids Tools 138 Keyboard Voltage and Strobe Mini MAP Conditions After Power On Service Aids Tools 139 Keyboard Clicker Mini MAP Conditions After Pow...

Page 8: ...ST EQUIPMENT CE General Logic Probe THEORY INTRODUCTION System Configuration DATA FLOW 1 43 1 43 1 43 1 43 1 43 1 43 1 43 1 44 1 44 1 44 1 45 1 45 1 46 1 46 1 46 1 46 1 48 1 51 1 51 1 51 1 52 1 53 1 54 1 54 1 55 1 55 1 55 1 56 1 56 1 57 1 58 1 59 1 59 1 60 1 62 1 63 1 64 1 67 1 68 1 69 1 70 1 80 1 81 1 82 1 82 1 83 1 85 1 86 2 1 3 1 3 2 4 1 4 1 4 1 4 3 FUNCTIONAL UNITS Keyboard and Keylock Adapter...

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Page 12: ... of data that separates all characters in that field command function keys The 14 keys in the top row of the display station keyboard that are used with the Cmd command key to request functions cont Controller Glossary of Tenns and Abbreviations contrast control Refer to reference 100 controller A device that controls the operation of one or more input or output devices data stream A continuing fl...

Page 13: ...onse More than one frame or multiple frames of data that are sent xiv N C Pertains to a switch setting normally closed N O Pertains to a switch setting normally open null A character of all zeros that occupies a position in the buffer and is displayed as a blank Online tests A series of online tests that can be requested from the controller after power on and before sign on They are requested and ...

Page 14: ...urring at the same time SVCS Services Sys Req The Sys Req key is used to enter a request directly to the system TB Terminal block template Refer to reference 143 Terminator switch A switch used to terminate the twinaxial cable at the last display station or printer in a series This switch is a part of the Cable Thru feature on a display station theory A section of this manual that includes data fl...

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Page 16: ...splay Screen Note Block 0 Information Control Panel Block 0 Lights 0 On Page Connector Start and End of Flowchart Logic indicates CJ Off Page signal direction Connector Driver Anode Cathode Legend 5251 MIM xvii ...

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Page 18: ...on of the parts in the display station Maintenance procedu es contain removals replacements and adjustment procedures A procedures and drawings have the three digit reference number assigned to reference from the MAPs Diagnostic Aids Diagnostic program descriptions how to use them and what is available when they are in control are found in this section To aid in diagnosing machine failures in more...

Page 19: ...ion and where each function or feature fits in FEATURES The features that are available with the 5251 Model 11 Display Station are described in this section APPENDIXES Appendix A contains the setup procedures required to make a new display station operational Appendix B explains the purpose of special keys on the keyboard INDEX The index is a detailed list of all material in the MIM xx ...

Page 20: ...y Screen System Cable I r Connector socket 1 Address Switches 100 Maintenance Procedures Bezel Display Screen Indicators Power Switch Access Panel Cover Connector socket 2 Keyboard Cable Connector Maintenance Procedures 5251 MIM 1 1 ...

Page 21: ...101 COVERS OPEN Display Assembly 102 CABLE CHART Cu tomer s _ TWinaxial V Cables 1 I t Signal Line Voltage Feature Control Panel T e covers are shown pivoted open 1 2 ...

Page 22: ...103 MAIN PLANAR BOARD AND CARD LOCATIONS 1 1 103 813 013 813 013 Cable Connector Control Panel Station Address Cable Planar Power Cable Maintenance Procedures 5251 MIM 1 3 ...

Page 23: ...62538 Italy 7362539 Portugal 7362540 Spain 7362541 Spanish Speaking 7362542 United Kingdom 7362543 1 4 CAUTION The logic used on planar boards is susceptible to electrostatic discharge damage Avoid contact with any conductive parts Handle the planar by the plastic frame only Ground yourself and the conductive plastic bag containing the new planar by holding the bag and momentarily touching the mac...

Page 24: ... for 5251 Model 11 3 not used 4 not used 5 Installed for 5251 Model 11 6 Installed when needed for raster check 156 7 not used 8A not used 8B Installed for twinaxial cable 9 Installed both jumpers when the Cable Thru feature is NOT installed Jumper part 1794401 Main Planar Board A Connector Positions H 104 105 Maintenance Procedures 5251 MIM 1 5 ...

Page 25: ...ling the covers ensure that the cup of the screw fits over the lip of the cover to prevent damage to the cover and to ensure that the cover is securely fastened down 1 Pivot the front half of the cover toward the rear of the display station 2 Pivot the back half of the cover toward the front of the display station 3 Tighten the cup screws D and II Ensure that the cup fits over the lip on the cover...

Page 26: ...ol Ground 8 5 V Contrast Control Ground Identifier Depression LED Black 5V When you replace LED s align the identified lead white dot or flat side with the identifier depression in the LED holder Keylock Feature N O normally open Common N C normally closed Terminator Switch rear Position 2 Status Switch rear L Ground L L System Cable Connector L L Cable Thru Connector Position 1 n Ground lliNormal...

Page 27: ...E meter on frame ground at the power supply brightness control line will vary with the setting of the control and will be between 0 and 8 5 volts The voltage on the contrast control line will vary from less than 3 to 8 5 volts Planar Board Connector H I Interposer I I I I I I I E Control Panel Cable I l I I I i I B02 002 B02 I I I I I I I Controls 8 5 Vdc I 1 H B11 I Br ig h tn e ss c o n tr o I I...

Page 28: ...Y N Check for 8 5 volts on one top tab of the failing control Check the lower tab of the failing control The voltage should be ovolts if checking the brightness control Less than 3 volts if checking the contrast control Are the voltages correct Y N The cable or the planar is failing Trace the failing line back to the planar Replace the control Check the control line for an open Inspect the interpo...

Page 29: ...or line will damage the LED or the main planar board The voltage at this point is less than 5V when the LED is on The voltage only goes to 0 when the LED is open 5 Vdc 4 Line Sync _ Line Check t Internal Check Tools Ground the CE meter on frame ground at the power supply Planar Board I I I I I Interposer Control Panel Cable Control Panel LEDs Black 5V Wire I I ___ I_ iiiiiiiiiii I I I t I I F r l ...

Page 30: ...anar Is the cable OK Y N Repair or replace the cable Inspect the interposer Replace the planar set the jumpers correctly on the new planar 103 105 Connect the wires to the proper LED Replace the failing LED Connect the wires to the proper LED Trace the 5 Vdc common line from the LEOs back to the planar Suggested action for an intermittent problem Analyze the suspected line inspect all the connecto...

Page 31: ...e settings of the Address switches should not be changed unless either the Status switch is in the Test position or the internal system cable is removed from the planar Tools Connect the CE probe as follows lead 1 G D03 lead 1 G D08 Ground 1 8 008 Display Screen Status switch at the Test position Keyboard key pressed Planar Board I Interposer I Control Panel Cable I __1 t I I I I r 1 I _ I I F I I...

Page 32: ...ne or a short circuit in the switch Is the line OK Y N Replace the cable or switch Inspect the interposer Replace the planar set the jumpers correctly on the new planar 103 105 Set the Address switches correctly Inspect the interposer Replace the planar set the jumpers correctly on the new planar 103 105 Set the Address switches correctly Suggested action for an intermittent problem Analyze the su...

Page 33: ...114 KEYLOCK MINI MAP Planar Common N O normally open black 1 14 Keylock Cable Connector Pins Keylock Switch Unlocked N C normally closed r Internal System Cable Keylock Feature ...

Page 34: ... switch in the locked position Does the meter indicate an open Y N Repair or replace the keylock assembly Check continuity at the planar end of the cable between the normally closed and the common lines with the switch in the unlocked position Is there continuity Y N Repair or replace the keylock assembly Replace the planar board set the jumpers correctly on the new planar 103 105 114 Suggested ac...

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Page 36: ...ser Internal Keyboard Cable Keyboard Signal Cable Keyboard ID Jumper Block IBM 5251 Display Station Model 11 ctr 0 C 0 o o o e Keyboard Logic Printed Circuit Board Pad Printed Circuit Board Connector Contacts Keyboard Assembly Maintenance Procedures 5251 MIM 1 17 ...

Page 37: ...1 To assemble reverse the above procedure 132 CLEANING 1 Disassemble the keyboard 131 2 Clean the pad printed circuit board with a water moistened lint free cloth Check the flyplates for 1 18 dirt clean only those flyplates that are dirty or are causing failures 133 KEY MODULE Removal 1 2 3 Use the keytop removal tool part 9900373 to lift the keytop pushbuttons from the keys to be removed Disassem...

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Page 39: ...sition over its key modules Guide the stabilizer II into the openings in the pivots 4 Press the Spacebar on the key stems IJ 1 20 135 FLYPLATE REPLACEMENT Reinstalling a disconnected flyplate in a key module is not recommended If replacement is necessary becau e a new key module is not available inspect the flyplate to ensure the connection is not loose between the spring and flyplate or the flypl...

Page 40: ...per clip through one of the access holes in the key module II 8 Push the tip of the flat spring up on the inside of the flyplate spring 9 Move the flat spring down until the tab drops into the opening of the flyplate spring 10 Attach the other end of the spring in the same way 134 135 11 Carefully remove the tape holding the key stem 12 Check the key stems for taper in the center opening and form ...

Page 41: ... Tools Connect the CE probe as follows lead 1 G D03 lead 1 G D08 Ground 1 B D08 Display Screen The Status switch at the Test position Keyboard key pressed 1 22 CJ The display station will not be damaged if powered on after the keyboard cable is disconnected Keyboard 10 0123xxxx Planar 80ard Keyboard 10 8it 0 Keyboard ID 8 it 1 Keyboard 10 8it 2 Keyboard 10 8it 3 5V D 002 1 8 004 1 8 005 1 8 D09 1 ...

Page 42: ...anar back to the jumper block on the logic PC board for a ground Is the line OK Y N Replace the cable or keyboard logic PC board Inspect the interposer Replace the planar set jumpers correctly on the planar 103 105 Set the 10 jumper correctly Inspect the interposer Replace the planar set jumpers correctly on the planar 103 1 05 Set the 10 jumper correctly 136 Suggested action for an intermittent p...

Page 43: ...ion in the displayed field is normally 0 The position changes to l only after the Shift key is pressed and released b The display station will not be damaged if powered on after the keyboard cable is disconnected Planar Board I Interposer I Internal I I I Keyboard I I I Cable I I Connector B I 13 I Keyboard Signal Cable I I I 1 1 I i 0 rt1 I J Iii 1 25 I I t t tiJJ c B02 Code Keyboard Logic Printe...

Page 44: ...n level Y N Replace tht keyboard logic PC board Disconnect the cable at Socket B on the planar Is the line still at a Down level Y N Repair or replace the failing keyboard cable Replace the planar set the jumpers correctly on the new planar 103 105 Inspect the interposer Replace the planar set the jumpers correctly on the new planar 103 105 137 Suggested action for an intermittent problem Analyze ...

Page 45: ...pulse will be positive when a key is pressed Service Aids When a key is pressed the data strobe line pulses at a Down level When the planar receives the data strobe line it pulses the delay strobe line at an Up level Planar 80ard I Interposer I I I I I Internal Keyboard Cable lead l G D03 lead l G D08 Ground 1 B D08 I I I 13 I Keyboard Signal Cable I Connector 8 I I I 1 _1 f i 0 I I I n 1 7 IB02 I...

Page 46: ...03 105 Check the DATA strobe line at the keyboard end of the cable Does the line pulse when a key is held down Y N A B 138 Check the DELAY strobe line for an open Inspect the 5 5 and B07 DATA strobe line contacts on the keyboard end of the cable A B Are the cables OK Y N Repair or replace the failing cable Replace the keyboard logic PC board Check the DATA strobe line in the cables for an open Are...

Page 47: ... sound This line also pulses each time the program loops in Test mode The clicker coil can be tested by removing the lower wire from the connector block and touching ground The display station will not be damaged if powered on after the keyboard cable is disconnected Planar 8 5Vdc 1 B Bl1 Internal Keyboard Cable 13 Tools Connect the CE probe as follows lead 1 G D03 lead 1 G D08 Ground 1 B D08 Keyb...

Page 48: ... the cable Does the line pulse each time a key is pressed Y N Is the line at a Down level Y N Does the line 1 8 803 pulse at the planar each time a key is pressed Y N Inspect the interposer Replace the planar set the jumpers correctly on the new planar 103 105 Check the cable for an open Check the clicker activate line for a ground Check the keyboard end of the cable Replace the logic PC board 139...

Page 49: ...ll not be damaged if powered on after the keyboard cable is disconnected Tools Connect the CE probe as follows lead 1 G D03 lead 1 G D08 Ground 1 B D08 I Interposer I I I I I Planar Board Internal Keyboard Cable I I I 13 I Keyboard Signal Cable I Connector B I I tt 1 r 7J C 1 1 25 I 14 I I I I I B02 D02 IB02 I I I I I I I I I Cable Check A I 1 B B02 I Access Panel 1 I I I 21 B02 B02 I I D12 1 30 K...

Page 50: ... PC board back to ground on the planar Inspect the interposer Replace the planar set the jumpers correctly on the new planar 103 105 Suggested action for an intermittent problem Jumper 1 8 D02 to 1 8 012 If the problem still occurs replace the planar If not the cable or keyboard logic PC board could be open Maintenance Procedures 5251 MIM 1 31 ...

Page 51: ...display station will not be damaged if powered on after the keyboard cable is disconnected Tools Connect the CE probe as follows lead 1 G D03 lead 1 G D08 Ground 1 B D08 Planar I Interposer I Board I I I I I Connector 8 I I J I Internal Keyboard Cable Keyboard Signal Cable B02 1 32 Keyboard Logic Printed Circuit Board t 7 T I II 602 1 I602 Clean both sides I 002 I I of the pad I printed circuit I ...

Page 52: ...e taken the wrong path Go to MAP 0001 Start of Call Power off Remove the cable at socket B Power on Is the line at a Down level at the planar Y N 141 Check for a ground in the cable or keyboard logic PC board Inspect the interposer Replace the planar set the jumpers correctly on the new planar 103 105 Suggested action for an intermittent problem Analyze the suspected line inspect all the connector...

Page 53: ...Denmark Finland France AZERTY Canada French France aWERTY International Italy Japan English J pan Katakana Latin America Norway Portugal Spain Sweden United Kingdom U S Canada 1 Jumpered o Not Jumpered 101 0 1 010 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 101 0 101 0 101 0 101 0 101 0 101 0 101 0 101 0 101 0 0010 Power On Diagnostic Display Status switch at the Test position Keyboard key pressed Cod...

Page 54: ...eys selects Display Mode command functions 13 through 24 or Clear 19 7 20 21 22 23 24 Glear 8 9 10 11 12 Test Request The keyboard template is placed in the opening above the top row of keys on the keyboard cover The customer can change the template to indicate the name of the command function that compares to the top row key numbers Standard Keyboard Layout 0GJGJ0GGJ0GJGG0GGC 24 25 0 GGG80000G00G...

Page 55: ...011 53 18 00011000 11 3E 00111110 54 19 00011001 12 31 00110001 55 lA 00011010 13 32 00110010 56 lB 00011011 14 33 00110011 57 lC 00011100 15 34 00110100 58 44 01000100 16 35 00110101 59 45 01000101 17 36 00110110 60 46 01000110 18 37 00110111 61 40 01001101 19 38 00111000 62 57 1010111 20 39 00111001 63 OE 00001110 21 3A 00111010 64 01 00000001 22 38 00111011 65 02 00000010 23 3C 00111100 66 03 0...

Page 56: ...6 01000110 18 37 00110111 61 40 01001101 19 38 00111000 62 57 1010111 20 39 00111001 21 3A 00111010 64 01 00000001 22 38 00111011 65 02 00000010 23 3C 00111100 66 03 00000011 24 61 01100001 67 04 00000100 25 3D 00111101 68 05 00000101 26 4C 01001100 69 06 00000110 27 20 00100000 70 07 00000111 28 21 00100001 71 08 00001000 29 22 00100010 72 09 00001001 30 23 00100011 73 OA 00001010 31 24 00100100 ...

Page 57: ...nts 150 B TYPE DISPLAY ASSEMBLY LOCATIONS Top View Display Signal Planar Power Cable Connector G Mounting Screws High Voltage Power Supply Ground Display AC Printed Circuit Power Cable Edge Connector 1 Refer to the decal if it is present Horizontal Width Horizontal Centeiing B r _Focus Vertical 1 HOld Tn Vertical rr F Height Brightness Video Vertical Limiter Gain Linearity Cathode Ray Tube Align t...

Page 58: ... Cable 1 Refer to the decal if it is present High Voltage Transformer Align the pointer with the notch when you connect the cable B c J 0 Horizontal Width t L r rKFOCUS Vertical earity Vertical Video Horizontal Brightness Linearity Phase Hold Drive Centering Maintenance Procedures 5251 MIM 1 39 ...

Page 59: ...tness Limiter Control Yoke Centering Rings n _____ 7 Jrr r n High Voltage 1 7 tO Transformer Filament Printed Circuit Board Printed Circuit Edge Connector Align the pointer with the notch when you connect the cable 1 Refer to the decal if it is present Brightness Limiter B I F V Vertical Linearity Vertical Height 1 40 ...

Page 60: ...onnector G Printed Circuit Edge Connector Focus Brightness B Horizontal Width Limiter Control j o Vertical Hold Printed Circuit Board o Vertical Height Linearity Centering Rings Filament notch when you connect the cable 1 Refer to the decal if it is present 150 Maintenance Procedures 5251 MIM 1 41 ...

Page 61: ...hit or falls For personal safety wear safety glasses 6 Lift the display assembly from the display station housing 7 Install the new display assembly Place the used display assembly in the shipping container for return to the branch office 8 Fasten the display assembly with the hardware that is provided on the new display assembly 9 Connect the printed circuit edge connector Align the pointer of th...

Page 62: ...ormally use the Brightness control on the control panel for attaining the best display screen image The video gain can correct the horizontal or vertical intensity of a character 151 153 153 VERTICAL AND HORIZONTAL ADJUSTMENTS Vertical Adjustments The vertical adjustments could interact You should adjust the vertical hold anytime the picture rolls before you continue with the other vertical adjust...

Page 63: ...ons of a display If the display is tilted do not adjust the ring magnets turn the yoke 154 The following adjustments will interact Adjust both rings to attain the best results 1 Adjust the rear ring magnet for horizontal center ing The space on the left and right margins of the display should be equal This space can be determined from the 80th character on the right of the display 2 Adjust the fro...

Page 64: ...m Video Adjustments 152 Raster Check CAUTION Power off when installing jumpers to prevent damage to the planar board To display a complete raster install a jumper on jumper position 6 on the the main planar board This places a solid high level voltage on the video signal line A complete raster will check the display assembly and display signal cable 153 156 Main Planar Board Raster Check Jumper pa...

Page 65: ...Except the M Type Display 150 Dark Screen The raster check jumper 156 forces a high video signal that lights the display screen A video or horizontal sync failure causes a dark screen M Type Display 150 Rolling or Unstable Display Check the horizontal and vertical lines for opens Check the adjustments 153 M Type Display 150 Dark Screen Check the video lines for an open The raster check jumper 156 ...

Page 66: ...play Power up Does the line pulse now V N Check the cable for a grounded signal line Is the cable OK V N Repair or replace the cable Replace the planar set the jumpers correctly on the new planar 103 105 Replace the display Is the line pulsing at the display V N Check the cable for an open Is any other line called out by the MAP that has not been checked V N Reconnect the display AC power connecto...

Page 67: ...158 DISPLAY SCREEN EXAMPLES Normal screen free key mode Display not centered 1 48 ...

Page 68: ...158 continued Tilted display Display size not correct too small 158 Maintenance Procedures 5251 MIM 1 49 ...

Page 69: ...1 50 158 continued Display size not correct expanded vertically Characters missing only in the corners ...

Page 70: ...ble Thru feature is NOT installed Main Planar Board A Connector Positions H 158 170 171 The Terminator switch cable thru feature on the access panel has a position 1 and position 2 Position 1 stops the communications signal and completes the circuit Position 1 is the required position when the display station is the last work station on the line All other stations in the series must have the Termi...

Page 71: ...s of a Cable Thru feature on each work station in the configuration f I I I I I System Customer s Twinaxial Cable 1 52 Data Flow D Data is entered at the keyboard II Data is transferred to the controller II Data is interpreted by the controller II Data can be used by the system m Data is returned to the 5251 for displaying The combined length of cable for each series must not exceed 1 524 meters 5...

Page 72: ...le cables or connectors during an electrical storm Typical Installation System Controller Building 1 Work Station Station Protector Board Outdoor Cable Station Protector __ _ _4 2 I I I I L______ 172 173 Only use CE meter part 1749231 Use the R x 100 scale 1 2 Check each diode with the black lead connected to the anode and the red lead connected to the cathode The resistance should be less than 2 ...

Page 73: ...fan is visible from the display assembly side Line Filter attached to the display base under the power supply 1 54 World Trade Terminal Block 50 Hertz 1 1 1 inside cover 5V Test Point Low Voltage Circuit Breaker Low Voltage Connector Detail Connector Pin 2 3 5 6 1 4 7 8 9 Description 5V 5V Ground 8 5V ...

Page 74: ...n to the branch office 8 Fasten the power supply with the mounting screws 9 Reconnect the cables 10 Check the World Trade transformer connections 184 180 183 182 VOLTAGE LEVEL CHECKS Voltage levels can be checked as follows on the power cable to the main planar board or at the power supply IDANGER Line voltage is present at the power supply Low Voltage DC Voltage Connector Level Planar Board Conne...

Page 75: ...Line Voltage Black White Voltage 115 Line Filter Limits Power Switch 104 to 126 Vac Circuit Breaker _ Low Voltage Connector 120 Vac Display Assembly Connector Pin 2 3 5 6 1 4 7 8 9 Power Supply Printed Circuit Board 1 56 Description 5V 5V Ground 8 5V ...

Page 76: ...nnections Voltage Limits To To ToTB 100 Vac 90 to 110 Vac TB l TB 2 1 and 5 to TB l 2 and 6 to TB 2 110 Vac 99 to 121 Vac TB l TB 3 1 and 5 to TB l 3 and 7 to TB 3 123 5 Vac 112 to 135 Vac TB l TB 4 1 and 5 to TB l 4 and 9 to TB 4 200 Vac 180 to 220 Vac TB l TB 6 2 and 5 to TB 2 220 Vac 198 to 242 Vac TB l TB 7 3 and 5 to TB 3 235 Vac 212 to 258 Vac TB l TB 8 4 and 5 to TB 4 184 Circuit Breaker Co...

Page 77: ... CORD LINE FILTER REMOVAL AND REPLACEMENT 1 Remove the power supply 181 2 Repair or replace the line cord or the line filter Note For the location of the line filter see 180 3 Replace the power supply 181 1 58 ...

Page 78: ... this light on even if the poll or data is not addressed to that work station The addressed work station returns an error response to the controller The controller resends the information that caused the error until the information is received at the display station error free at which time the light will be turned off Internal Check When on this light indicates that a parity error has been found ...

Page 79: ...r will sound only for the first 4 keys pressed Additional keys can be pressed but the clicker will be inactive If the Status switch is now set to the Test position lines 0 and 25 will be displayed for approximately 5 seconds During this 5 seconds the hexadecimal code of the last key pressed will be displayed in position 76 of line 25 Cursor Display Positions L _ Lineo EfF Line25 A B c 4 5 6 1 60 L...

Page 80: ...native display of line 25 occurs when ever contents of the last key log position 76 contains the break bit This is a result of pressing and releasing any shift key before or during the time the Status switch is set to the Test position Line Position 54 55 56 59 60 61 62 63 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Keystroke Queue _ l most recent leftmost byte Audible Alarm 1 Click Count Normal Dis...

Page 81: ...ge 22 High intensity 23 Reverse image high intensity 24 Underscore 25 Underscore reverse image 26 Underscore high intensity 27 No display 28 Blink 29 Blink reverse image 2A Blink high intensity 2B Blink high intensity reverse image 2C Blink underscore 2D Blink underscore reverse image 2E Blink underscore high intensity 2F No display Hexadecimal codes 30 through 3F are the same as 20 through 2F but...

Page 82: ... on to either customer sign on or online test Power Switch on Test 202 203 Cursor in position D System Available indicator is off ine Sync o Line Check o Internal Check o Storage Check Ready No Power On Display station must be configured Establish contact with the system Maintenance Procedures 5251 MIM 1 03 ...

Page 83: ...ync o Line Check o Internal Check o Storage Check o Ready 00 Line Sync o Line Check Internal Check o Storage Check o Ready o 00 Line Sync Line Check o Internal Check o Storage Check o Ready o Power On Diagnostic Flowchart Part 1 of 3 Power On Check storage with 1 0 pattern initialize storage for remainder of Check display adapter display control and access functions Test with AA 55 40 pattern Curs...

Page 84: ...te storage for normal operation Power on diagnostic switches control to main program The Line Sync light is on when the controller is polling 204 No data should be present Ready light off Scan code is presented as 8 position binary pattern on screen Station Address No Clicker sounds every 2 to 3 seconds To Power On Diagnostic Flowchart part 1 of 3 Maintenance Procedures 5251 MIM 1 65 ...

Page 85: ...66 I Read Only I Storage I I I I Microprocessing I Unit MPU Check D I CD To Controller To Next Terminal _ Cable Thru Feature 4 I I e fJ Stora e Check I Read Write I Storage I I e Cable Display Adapter Adapter G 0 Line Check Line Sync e 0 Internal Check CD 0 Storage Check e 0 Ready Brightness Contrast lI able Che _ _ _ II Display __ 2 Address Switches lID T Horizontal Vertical and Video Signals Pow...

Page 86: ...function keys The following function keys if pressed in free key mode will return an error code 0099 Print Help Rollt Up RolI Down Enter Record Advance Test Request Attention Command function keys 1 through 24 Use online tests 206 to check these key operations Cursor in position E 204 205 System Available indicator is on Line Sync o Line Check o Internal Check o Storage Check Ready Controller and ...

Page 87: ...wever the work station must be in a signed off condition before online tests can be run on that work station There may be various ways to terminate or sign off a job To describe them here is beyond the scope of this manual as the methods used are system operating procedures If you are not familiar with the system use the procedure in the following flowchart Ensure that the Status switch is in the ...

Page 88: ...ual SY31 0462 the controller ERAP ERAP ERAP ERAP Option Option Option Option 1 7 8 9 See the maintenance See the IBM 5256 Printer documentation for Maintenance Information the controller Manual SY31 0462 Display Display Display Display Verification Verification Verification Verification Option Option Option Option 1 2 3 4 Displayable Function Keys Characters and Features 206 Maintenance Procedures...

Page 89: ...1 70 Online Tests Displays Select the Display Verification Menu by a Pressing the 1 key b Pressing the Enter key ...

Page 90: ...he right side of the display screen 4 Key in one of the hexadecimal numbers shown on the left side of the display screen and press the Enter key Observe the r sults that take place on the right side of the display screen Compare these results to the attribute description on the left An incorrect entry causes the entry to blink at high intensity Repeat steps 3 and 4 for each of the remaining hexade...

Page 91: ...y a Pressing the 2 key b Pressing the Enter key This display provides a matrix of characters representing the character set of the keyboard Return to the Display Verification Menu by a Pressing the C key b Pressing the Enter key 1 72 ...

Page 92: ...Key Press the Dup key once The key code of the Dup key will be shown until the screen is written by the controller This field will duplicate the Numeric Only Field Signed Numeric Key in 4 numeric characters The cursor will remain under the last character keyed Press the Field Exit key positive or the Field key negative Bypass This field will be automatically bypassed and no entry will be required ...

Page 93: ... screen while performing step 4 4 Press and hold the Cmd key and press command function key 1 Release both keys Repeat until command function keys 1 through 12 have been pressed Now press and hold the Cmd key and the Upper Shift key while pressing command function key 13 Release all three keys Repeat until command function keys 13 through 24 have been pressed 5 Repeat step 4 and a normal display o...

Page 94: ...ess of the controller 2 Unit Addr is the stations s assigned to the controller The first digit is the port number and the second digit is the station address 3 Logical ID is the name the system uses to address this station 4 Return to the Prime Option Menu by a Pressing the C key b Pressing the Enter key 206 Maintenance Procedures 5251 MIM 1 75 ...

Page 95: ...splay Stations by a Pressing the 8 key b Pressing the Field Exit key Note For a detailed ERAP explanation refer to the system documentation For display station problem identification see 208 Error History Table in this section Select the desired device by a Entering the ID of the device b Pressing the Enter key 1 76 ...

Page 96: ...nt to look at the error tables on the display screen a Press the 1 key b Press the Enter key If you want a printout of the error tables a Press the 2 key b Press the Enter key 206 Maintenance Procedures 5251 MIM 1 77 ...

Page 97: ...er key is pressed the I O Counter Table for the second device will be displayed This sequence will be repeated until each device Error History Table has been displayed If you have selected a specific device these three tables may be redisplayed or reprinted in order as many times as desired by pressing the Enter key after each one has been displayed or printed Press the Enter key 1 78 ...

Page 98: ... 1 Return to the ERAP Menu by a Pressing the C key b Pressing the Enter key 2 Return to the Prime Option Menu by a Pressing the 0 key Numeric 0 b Pressing the Field Exit key 3 Return to the Sign On Menu by a Pressing the C key b Pressing the Enter key 206 Maintenance Procedures 5251 MIM 1 79 ...

Page 99: ...ation customer twinaxial cable controller and system must be operating correctly The initial program load lPL sign on procedure must be completed before this procedure can be used D e S t Press and hold the Shift key Press Sys Req key and Enter key Shift 1 _ System has enable in struction for display station End sign on procedure er 3 System and 5251 session established __ Nam ID etc 1 80 ...

Page 100: ... 01 5251 Error type Controller defined any error bit present see Controller Host MAP reserved No response Transmit activity chec reserved Receive parity check Receive length check reserved Even odd timeout k y Busy Line parit reserved Outstanding 0000 0000 0000 0000 0100 0001 0000 1001 0000 0000 0000 0000 0000 1000 76 08 24 0000 0000 76 07 24 TDefines status byte a 04 46 19 02 32 06 001a keyboard ...

Page 101: ... is set when the display station is powered on The bit is reported as an error only if the display station was in session 1 82 0109 Activate Command Failure The controller checked the device status and found that the busy bit was not on after an activate com mand Keyboard Errors 0111 Scan Code Not Valid The 8 bit code sent in the keyboard response frame does not translate to an assigned character ...

Page 102: ...r from the display station has not changed in 225 ms after the controller has sent a positive acknowledgment and has received a nonbusy response 0191 Busy The controller finds that the busy bit has been on for a period greater than 400 ms Maintenance Procedures 5251 MIM 1 82 1 ...

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Page 104: ...code that is not valid and does not know what key you pressed KBD 0003 INVALID KEY FOLLOWED CMD KEY 209 You have pressed the Cmd key but the next key you pressed was not one of the command function keys KBD 0005 CURSOR IN PROTECTED AREA OF DISPLAY You have attempted to enter data however the cursor is not in an input field on the display Data cannot be entered in a protected area of the display Mo...

Page 105: ...ter data or press the Field Exit key to leave the field KBD 0017 MANDATORY FILL FIELD KEY USED INVALIDLY You have pressed the Field Field or Field Exit key however the cursor is not in the first or last position of this mandatory fill field A mandatory fill field must be completely filled unless you exit the field from the first position in the field and no data is entered into the field Enter dat...

Page 106: ...t yet used the system request functions the Sys Req key is the only valid function key at this time Note When this error occurs the display station is in free key operation Free key operation is described in reference 205 210 DIAGNOSTIC DISPLAY LOCATIONS Cursor Display Positions E A B C Power On Diagnostic Display Status switch at the Test position Keyboard key pressed Code 211 not used 209 210 D ...

Page 107: ...ve you as much information as possible about the failing curcuit It is possible the symptoms could change or disappear during probing on an intermittent problem All the diagrams use the same format Conditions After Power On Describes the normal condition of the circuit after Power On Service Aids Lists suggestions as to how the circuit may be tested and additional information about the circuit Too...

Page 108: ...pull up resistor at the SINK receiver will cause an up level at the SINK receiver if the cable is open Is the signal present at the SINK receiver Y N Repair or replace the interposer or cable Is this the last signal line to be checked Y N Go through the same procedure for any other lines called out by the MAP Replace the SINK receiver 212 Suggested action for an intermittent problem Analyze the su...

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Page 110: ...Preventive maintenance is not required on the display station Preventive Maintenance Preventive Maintenance 5251 MIM 2 1 ...

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Page 112: ...l kit A kit of metric tools is available from Mechanicsburg by ordering bill of material 1749235 Note In the display station all metric screws are blue 4 Fiber screwdriver A Fiber screwdriver is required for adjusting the cathode ray tube This screwdriver is available by ordering part 460811 Tools and Test Equipment Tools and Test Equipment 5251 MIM 3 1 ____________________111____________ ...

Page 113: ...d should not be placed near the high voltage transformer or the neck of the cathode ray tube 150 Ground Lead CAUTION Connect this lead to any signal ground near the probe point Do not use frame ground Improper indications result if this lead is not connected to signal ground Note In order to avoid improper indications lead should not be placed near the high voltage transformer or the neck of the c...

Page 114: ...y stations attached to this system is specified during system configuration for the customer s application Display stations and printers can be attached in a point to point configuration or can be attached in a series configuration by means of a Cable Thru feature on each work station in the configuration Display stations rely on a controller and a system Data entered at the keyboard D is moved in...

Page 115: ...to the controller II Data is interpreted by the controller II Data can be used by the system m Data is returned to the 5251 for displaying The combined length of cable for each series must no e ceed 1 524 meters 5 000 feet Ii Ii I I II I I t i I I I 7 l Two display stations connected in series with the Cable Thru feature ...

Page 116: ...o Status Switch Planar 1 I I Keyboard Adapter I Read Only I Storage I I Keylock Feature Keylock Adapter Feature I 0 ___ 1 Microprocessing I Unit To Controller Cable Adapter ReadIWrite Storage Display Adapter I 0 0 Line Check o Line Sync e 0 Internal Check e 0 Storage Check 4 0 Ready Brightness Contrast I L_ ____________J To Next Terminal y Cable Thru Feature lID 4 2 T Address Switches r Power Supp...

Page 117: ... is then moved to the read write storage by the MPU Keyboard Keylock Adapter Status Switch 0 Planar 4 4 I l Keyboard I I I Command I or Address Register I I I I Read Only Storage Keylock Feature I O Data Ie To Controller To Next Termi nal _ 7 Cable Thru Feature Register Q 4 2 T Address Switches MPU ReadIWrite Storage Display Adapter G 0 Line Check o Line Sync e 0 Internal Check e 0 Storage Check e...

Page 118: ...omparable to the type of keyboard The keyboard identification specifies how the scan code is interpreted Typamatic keys reload the character buffer with a scan code for each scan code cycle The typamatic key operation is at a rate of 10 to 15 repeated operations per second 600 ms first cycle time The Shift and Shiftlock keys generate a break code pulse The break code indicates a change in shift st...

Page 119: ... Terminal Cable Thru Feature Keyboard Adapter Keylock Adapter Read Only Storage MPU Read Write I I I I I I I I Storage I 00line Sync G 0 Line Check e 0 Internal Check r B ht 4 0 Storage Check rig ness W G 0 Ready Contrast L _ Horizontal r G lID 4 2 T Address Switches Power Supply Power Switch I Address Control Raster Control Vertical I Row Attribute Character Buffer Control Generator I L _________...

Page 120: ...ter is determining the display position converting the position into the vertical and horizontal drive signals for the cathode ray tube This routine is constantly repeated to refresh the display The generated character matrix is a pattern of 16 scans by 8 dots wide Uppercase E Column 0 Column 1 4 5 6 7 8 9 10 Row 1 11 12 13 14 15 16 17 18 19 20 21 Column 2 22 Character 23 I Scan Lowercase e Code C...

Page 121: ...eld intensified by the intensity field attribute Both controls determine the voltage level of the video signal at the main planar Control Panel r i I I Brightness I I I I I I I I I I Contrast I I L ___ J Planar Board Display Chassis Video Horizontal Vertical Video rM1 r 1111111 r I 61 J1S Horizontal PJllL Contrast 0 to 0 6V Brightness 0 to 3V t I I 20 ms Vertical fL Video Signal 0 to 0 6V is added...

Page 122: ... CABLE ADAPTER The cable adapter is the hardware drivers receivers and logic on the planar board that handles the incoming and outgoing communications between the controller and the display station Note A twinaxial cable connects the display station to the controller See the Customer Twinaxial Cable section in the maintenance section of this manual and the Cable Thru description in the Features se...

Page 123: ... _ _ o 2 3 4 5 6 7 8 9 101112131415 0 2 3 4 5 6 7 8 9 101112131415 o 1P I Ix x x x x x x x 11 100011111 10 0 o 1 P 11 1 Ix x 11 I 1 0 x x x x x x 0 Bit Synchro nization _ _ I _ I Last Frame Additional Frames The 16 bit frame carries 13 bits of information in each direction The fill bits always 000 serve as a timing delay The parity bit makes the active bits in the frame even The display station de...

Page 124: ...he data transmission of any of the read or write commands Commands that must be followed by either a read activate or write activate command Read Between Limits 11010 causes data to be returned from an area in read write storage within the limits of the address counter register and the reference counter register Read Data 01000 starts the transmission of one byte of data from the display station t...

Page 125: ...utstanding Status Bit 7 o Display station not busy 1 Display station busy Bit 8 o No line parity error found 1 Line parity error found Bit 10 lnot used Indicates there is feature data or status from an I O device to send to the controller Bits 11 12 and 13 These three bits are encoded to indicate the exception status as follows Bit 11 12 13 o o o o o o o Bit 14 o o o o Description No exception sta...

Page 126: ...rite operation is initiated and handled the same as a read operation the difference being that the transferred data is from the controller to the display station Controller 5251 Read Data Read See Note 1 Poll See Note 2 Base Status busy See note 1 Keyboard Scan Code See note 2 Poll See note 1 Base Status not busy See note 1 Keyboard Scan Code See note 2 Activate See note 1 Data See notes 1 and 2 T...

Page 127: ...r To receive data from the cable and decode the data for either or both of the following Commands Transferring data to read write storage Received data is moved into the serdes until the sync bit is in the high order position The serdes is stopped permitting time for the data to be moved to read write storage Keyboard Status Switch Ot fPl r I I Keyboard Adapter Keylock Adapter Cable Adapter 1 I I ...

Page 128: ...nto two major parts a display regen area and an I O device control area The I O device control area is also divided into parts for display control cable adapter control and microprocessing unit work space Internal Processing Queue Each display station keeps a work area large enough to hold up to 16 frames of commands or associated data Commands and associated data are executed from this queue on a...

Page 129: ...r The registers are named the cursor address counter and the reference counter The cursor register controls the location of the cursor on the display screen The address counter register is used in reading data from as well as writing data The reference counter register is used for moving data from one display area to another 4 16 ...

Page 130: ...e of the screen Data displayed at the time the keylock is changed to the locked position is controlled by the application program Keyboard data entered while the keylock is in the locked position will not be displayed by the display station The Keylock feature can be in either the locked or unloc ed position and the power on diagnostic still functions the same Keylock Locked Unlocked FEATURES I O ...

Page 131: ...t work station in a series does not require the Cable Thru feature The basic machine has a built in termination an J requires a station address of 000 See the Customer Twinaxial Cable section in the maintenance section of this manual Note Do not leave the twinaxial cable disconnected when servicing the display station with the Cable Thru feature When this cable is disconnected other devices are ta...

Page 132: ... The setup instructions are written in two sections Section 1 can be completed without connecting the displ y station to the system Section 2 describes how to connect the display station to the system Setup Instructions Section 1 1 Remove the front access panel cover 2 Plug the keyboard cable into the keyboard cable connector 3 4 5 Verify that the Power switch is in the Off position Verify that th...

Page 133: ...re the Terminator switch on the preceding work station must be set to position 2 171 9 Set the Power switch to the Off position 10 To connect the system cable a Insert the system cable into the cable tunnel 1 opening on the back of the machine then push the cable into the opening until the cable connector appears at the front b From the front hold the cable connector and pull enough cable out of t...

Page 134: ... front access panel cover 13 Set the Power switch to the On position The following conditions indicate that the display station is working with the controller a The cursor is in the upper left corner b The System Available indicator is on c The Line Sync light is on d The Ready light is on e The three check lights are off If the display station has the condition as described in step 8 the system m...

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Page 136: ... shift function of this key is used to delete data from the display screen When the Delete key is pressed the character above the cursor is deleted and all characters to the right of the cursor in the same field are shifted to the left one position The lower shift function of this key allows a character or characters to be inserted into an existing input field on the screen without destroying data...

Page 137: ...ut fields that are specified by the program as right adjust or field exit required fields Field Key FIELD 8 2 This key has the same function as the Field Exit key and is for your convenience when using the 10 key numeric pad Field Key F O This key functions the same as the Field Exit key except that it inserts a minus sign in the last position of the input field An error is displayed if you press ...

Page 138: ... letter the special characters identified on the tops of the numeric and symbol keys can be entered and the function control keys on the left side of the keyboard can perform the function shown on the top half of the key Shift Lock Key v This key locks the keyboard in upper shift The keyboard can be returned to lower shift by pressing either of the shift keys Spacebar _____________________________...

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Page 140: ...s access panel switch 1 12 brightness control 1 8 contrast control 1 8 control panel LEDs 1 10 control panel switch 1 12 display signal planar power cable keyboard cable 1 30 clicker 1 28 ID 1 22 POR 1 32 scan codes 1 24 strobe 1 26 voltage 1 26 Keylock 1 14 CE tool kit 3 1 centering adjustment 1 44 character backspace key B 2 character matrix 4 7 characters field attribute 1 62 circuit breaker lo...

Page 141: ...omer twinaxial cable 1 51 data flow display station 4 3 data transfer 4 14 data transfer cable adapter 4 14 delete key B 1 diagnostic display locations 1 85 display adapter operation 4 6 theory 4 6 display assembly adjustments 1 43 B 1 44 centering 1 44 focus 1 44 horizontal 1 43 horizontal centering 1 44 horizontal width 1 43 vertical 1 43 vertical height 1 43 vertical hold 1 43 vertical linearit...

Page 142: ...ion keys and features 1 74 gain adjustment 1 43 half bits 4 9 height adjustment 1 43 help key B 2 hold adjustment 1 43 home key B 1 horizontal adjustment 1 43 horizontal movement key B 2 I O counter table 1 78 indicators input inhibited 4 9 insert mode 4 9 keyboard shift 4 9 message waiting 4 9 system available 4 9 information exchange diagram 4 13 input inhibited 4 9 insert character command 4 11...

Page 143: ...emoval and replacement 1 18 scan code tables 1 36 scan codes conditions after power on 1 22 mini MAP 1 24 service aids 1 24 troubleshooting 1 24 keyboard continued shift 4 9 spacebar 1 20 spacebar installation and removal 1 20 strobe conditions after power on 1 26 mini MAP 1 26 service aids 1 26 troubleshooting 1 26 template 1 35 theory 4 5 voltage conditions after power on 1 26 mini MAP 1 26 serv...

Page 144: ...yboard cable 1 30 clicker 1 28 10 1 22 POR 1 32 scan codes 1 24 strobe 1 26 voltage 1 26 keylock 1 14 move data command 4 11 M PU see microprocessing unit 4 15 new line key 8 3 online test configuration data 1 75 display attributes 1 71 display verification menu 1 70 displayable characters 1 72 entry procedure 1 68 ERAP menu 1 76 ERAP procedure 1 76 error counter table 1 78 error history table 1 7...

Page 145: ...tment 1 44 ripple level check 1 55 roll keys 8 2 safety CE safety practices vii specific dangers vi scan code interpretation 4 5 operation 4 5 tables 1 36 search next attribute command 4 11 search next null command 4 11 service aids access panel switches 1 12 brightness control 1 8 contrast control 1 8 control panel LEOs 1 10 control panel switches 1 12 display signal planar power cable 1 46 keybo...

Page 146: ...es 1 24 strobe 1 26 voltage 1 26 keylock 1 14 twinaxial cable 5 2 twinaxial cable and terminator switch 1 51 twinaxial cable jumper 1 51 typamatic keys operation 4 5 unpacking A 1 vertical adjustment 1 43 video adjustment 1 43 voltage level check 1 55 width adjustment 1 43 write activate command 4 11 write control data command 4 11 write data and load cursor command 4 11 write immediate data comma...

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Page 148: ...ion typoQraohical illustration and so on No reply Pane Numher Error Note All comments and suggestions become the property of IBM No postaQe necassary if mailed in the U S A Inaccurate or misleading information in this publication Please tell us about it by using this postage paid form We will correct or clarify the publication or tell you why a change is not being made provided you include your na...

Page 149: ...s Dept 245 Rochester Minnesota 55901 International Business Machines Corporation General Systems Division 4111 Northside Parkway N W P O Box 2150 Atlanta Georgia 30301 U S A only General Business Group International 44 South Broadway White Plains New York 10601 U S A International Fold FIRST CLASS PERMIT NO 40 ARMONK N Y Fold 0 c l 0 cc r 5 CD I I I I I I I h o 3 III r o J s III J C 5 r a J C en l...

Page 150: ...I i 1 I I J ...

Page 151: ...411 Northside Parkway N W P O Box 2150 Atlanta Georgia 30301 U S A only General BLlsiness Group International 44 South Broadway White Plains New York 10601 U S A UnternationaU SY31 0461 0 OJ U1 I l Q 0 OJ o I s Ql 5 I I Ql I n I I 0 3 o I s Ql I C 5 I Co C en en w 6 flo 0 6 ...

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IBM 5251 11, Maintenance Information Manual

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