Teletype 43K001/AAA Repair Manual Download Page 3

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REPAIR MANUAL

525

The

KEYBOARD REPAIR MANUAL

Comments concerning  content,  usability,  and  adequacy  of  this  manual will
be welcomed.  This  sheet  may be  removed  and  mailed  directly  to Teletype
Corporation.  This  sheet  may  also  be  used  for ordering  additional  copies  of

this manual.

Comments to:
Order manuals from:

Mail To:

Teletype Corporation

5555

Touhy Avenue

Skokie,

IL 60077

Dept

2811

Dept.

2812-2

Summary of Contents for 43K001/AAA

Page 1: ...Used in 42143 BASIC TERMINALS j j I I I...

Page 3: ...uacy of this manual will be welcomed This sheet may be removed and mailed directly to Teletype Corporation This sheet may also be used for ordering additional copies of this manual Comments to Order m...

Page 4: ......

Page 5: ...Teletype Corporation products or Sales Workshops on selected Teletype Corporation products for sales personnel who require basic knowledge to enable them to answer customer questions about the feature...

Page 6: ...being serviced can offer this total support effort Teletype Corporation Product Service the complete resource Teletype Corporation Product Service The Complete Resource NATIONAL SERVICE NETWORK Alban...

Page 7: ...r operations However Standard 42 or 43 Teleprinter Terminals are required to test and troubleshoot the keyboard when not installed on location Spare parts for repair are available from Teletype Corpor...

Page 8: ......

Page 9: ...REPAIR MANUAL PARTl PART2 PART3 PART4 PART5 PART6 TABLE OF CONTENTS GENERAL DESCRIPTION TROUBLESHOOTING DISASSEMBLY REASSEMBLY AND ADJUSTMENTS CIRCUIT DESCRIPTION AND DIAGRAMS PARTS AND UNIT CODES PA...

Page 10: ......

Page 11: ...n and normally open capacitive key elements in a matrix array All ordering numbers shown in this manual are Teletype Corporation part numbers When ordering replace ment parts unless otherwise specifie...

Page 12: ...SW PRINTER ON UP HALF UP 30 UP TEST PARITY DUPLEX CPS OFF ON FULL ON 10 DN BASIC KEYBOARD Fig 2 43K101 CAA o 50Kl22 AAE Keyboard Used in 42 43 Basic Terminal With Terminal Data Unit STATUS INDICATORS...

Page 13: ...CATORS 1 OPERATIONAL CONTROLS BASIC KEYBOARD Fig 4 50Kl22 AAG Keyboard Used in 42 Basic Terminal 1 1 BUlK A STATUS INDICATORS 1 OPERATIONAL CONTROLS 1 BASIC KEYBOARD Fig 5 50K122 AAM Keyboard Used in...

Page 14: ...rained crafts personnel to install maintain and if necessary service the 42 43 Teleprinter using recommended lists of maintenance spares The 50K122 keyboard is not however a field serviceable componen...

Page 15: ...s indicates the trouble is not in the keyboard return to the Teleprinter Troubleshooting section of the Service Manual for further analysis When a trouble is verified to be in the keyboard by replacem...

Page 16: ...d 6 Does LOCAL LOCAL TALK indi Go to 7 cator light when its keyswitch is depressed 1 6a Does LOCAL LOCAL TALK indi Go to 20 cator light when PRINTER TEST key is depressed 7 Does DATA indicator light o...

Page 17: ...ressed CAPS LOCK key released up 15 Are any erroneous characters generated when the corresponding keyswitch is not depressed ie tap ping on keyboard or depressing any other keyswitch 16 Do all data ke...

Page 18: ...properly latch click etc Go to 20a Replace defective keyswitch r 20a Is keyswitch in question PRINTER Go to 20b Go to 21 TEST PARITY Interlock DUPLEX orCPS 1 20b Is 5 V present on pin 1 of keyswitch...

Page 19: ...onnected from pin 2 of keyswitch in question to its associated sense amp input is failure corrected MANUAL 525 2 5 YES NO Check clock generation Check cable for open and driver circuitry circuit Go to...

Page 20: ...d QUESTION YES 28b Is depression pulse present on Replace defective sense keyswitch logic inputs MLA5 10 amp 11 or 12 with no keys depressed 29 Is trouble present but not defined Undefined trouble ref...

Page 21: ...CR1 CR9 I MLA4 MLA1 MLB1 MLA5 Cathode I MLB2 MLA6 MLB3 __r v L_ 14 MLB4 13 12 11 10 9 8 A Anode SEMICONDUCTOR IN CIRCUIT STATIC FORWARD RESISTANCE COMPONENT RESISTANCE Approx CR1 CR9 STATIC CIRCUIT RE...

Page 22: ...Local Talk 110000000 1 1 1 30 000110000 0 zero 100101001 2 1 1 31 101100111 g 001000111 3 1 1 3 2 010000001 Ll Data 010000001 1 12 33 101110000 p 001010000 2 12 3 4 001110100 t 101010100 3 12 35 01000...

Page 23: ...1 19 54 000001010 Line Feed 000001010 15 2 19 55 001101010 j 101001010 15 3 19 56 100110100 4 000100100 14 1 20 57 100111000 8 100101010 14 2 20 58 000111001 9 000101000 14 3 20 59 001101001 1 1010010...

Page 24: ...Are supply voltages present at inputs Go to 4 to MLBl 4 Is clock pulse present and correct Go to 5 at pin 11 of MLBl 5 With REPT key and keyswitch in Check Pl07 pin 6 question depressed is serial data...

Page 25: ...k etc 9 Is trouble present but not defined Undefined trouble Review initial indication refer to circuit descrip of trouble tion and diagrams etc Note The 410101 circuit card is susceptible to contamin...

Page 26: ...EJ J CJ c J CJ C c J CJ c J c J c J CJ Cd C COMPONENT IDENTIFICATION AND LEAD DESIGNATION c CRl ML I r r 40 Cathode A Anode 20 ____ 21 SEMICONDUCTOR IN CIRCUIT STATIC FORWARD RESISTANCE COMPONENT CR1...

Page 27: ...010 2 101000000 2 2 100110001 1 000100001 2 1 000011011 ESC 000011011 ESC 3 15 001011100 101111100 I I 3 14 101111111 DEL 101111111 DEL 3 13 Non Send REPEAT Non Bend REPEAT 3 12 100111101 101011011 3...

Page 28: ...INE FEED 000001010 LINE FEED 5 14 Non Send RIGHT SHIFT Non Send RIGHT SHIFT 5 13 No Key No Key 5 12 100101111 I 000111111 5 11 000101110 100111110 5 10 100101100 000111100 5 9 101101101 m 001001101 M...

Page 29: ...Is negative pulse present on MLA3 3 when PRINTER TEST key is released 9 Does voltage on MLA3 3 toggle from 5 V to 0 V when RESET key is depressed and toggle from 0 V to 5 V when RESET key is released...

Page 30: ...nd 8 connected Check START LATCH to GND are pulses present on Replace MLB4 MLA2 8 11 Is 0 V present on INTERLOCK Check cable for open SWITCH pin 1 when INTERLOCK circuit SWITCH is closed depressed 12...

Page 31: ...T IDENTIFICATION AND LEAD DESIGNATION MLA2 MLA3 MLA4 14 13 12 11 10 9 8 MLA1 MLB1 MLB2 MLB3 MLB4 STATIC CIRCUIT RESISTANCE See Note CONNECTOR TERMINAL P107 8 5 V P107 2 12 V REFERENCE POINT P107 4 log...

Page 32: ...4 V to 3 9 V as switch is released Depress and release Printer Test Switch Meter will momentarily deflect from 0 V to 0 1 V as switch is released Depress Reset Switch 4 V Release Reset Switch 0 V Depr...

Page 33: ...facility When removing a subassembly or part from the keyboard follow the removal procedure and note the sequence of removal to enable proper reas sembly Precautions should be taken to assure that th...

Page 34: ...ward pressure to the spacebar and disengage the two front tines d Remove the wire bail from the left and right spacebar guides snap in and out Fig 4 SNAP DETENT Fig 4 Wire Bail Removal To reassemble t...

Page 35: ...ar housings as shown below HOUSING CHANNEL BAIL Front Fig 7 Wire Bail and Housing Assembly MANUAL 525 3 3 b Snap the two spacebar housings into the keyboard channel See Fig 7 Make sure the four tines...

Page 36: ...dex finger 2 Exert upward force until keytop releases Fig 11 control Keytop Removal d To remove early design RETURN keytop with housing 1 Remove keytops BACK SPACE OVER LINE GS US LINE FEED SHIFT and...

Page 37: ...p push rod and the rear spring b Replace keytops SPRINGS Keyswitch Right View SPACER PUSH ROD Fig 16 Keytop Spacer Alignment MANUAL 525 3 5 Keyswitches To remove the keyswitches a Remove keytop b Remo...

Page 38: ...Fig 20 4 4 4 4 4 4 _SOLDER REMOVED Fig 20 connector Pins Warning Use a grounded low wattage solder ing iron avoid prolonged contact with pins along with a desoldering tool to prevent damage to card c...

Page 39: ...d connector pins of cable to be removed Fig 25 6 6 6 6 6 6 6 ____SOLDER REMOVED Fig 25 connector Pins Warning Use a grounded low wattage solder ing iron avoid prolonged contact with pins along with a...

Page 40: ...Keytops Page 3 3 b Remove all keyswitches associated with channel to be replaced Refer to Key switches Page 3 5 c Remove right side frame by removing four screws and loosening one screw Fig 28 Channe...

Page 41: ...urved slot right side has square slot Fig 30 channel a Slide channel to the left and engage tines on left side frame L CHANNEL CJ Cl Cl Cl CJ CJ c ooooooc LEFT SIDE FRAME TINES Fig 31 channel Engageme...

Page 42: ...Page 3 3 b Remove all keyswitches refer to Keyswitches Page 3 5 c Remove the two screws securing the circuit card to the channel Fig 32 CHANNEL I ciRCUIT CARD Top View Remove Fig 32 Channel Removal d...

Page 43: ...Replace all keytops previously removed Circuit Card Components To disassemble the circuit card components a Remove circuit card shield by removing four screws Right Side b KSR Only If circuit card co...

Page 44: ...f 1 er c J c J ROWB MLII c J 43 10 E a u Jg Do i D r L __ _ Issue Number Fig 36 Component Identification 43K101 Keyboard J D DDDDO n s 1 2 3 0 0 e 0 0 0 11 J 20 A I I I I I I I I I 5 I PARITY I SPEED...

Page 45: ...d To install spacebar insert the wire bail in its guide slots and while engaging the spacebar with its guide and the wire bail push down on the spacebar until the tab on the left side latches into the...

Page 46: ...embly Fig 43 Warning Once the circuit card is removed main tain the keytops in the undepressed state Depress ing a keytop will dislodge the key plunger mecha nism Also the cams of the latching keyswit...

Page 47: ...keytop plunger retainer compression spring and circuit card See 3 14 b Depress the plunger assembly until it slides out of the housing MANUAL 525 3 15 c Remove the latching cam by grasping it s ring a...

Page 48: ...keytop To block keytop in DOWN position a With the keytop removed remove the nylon retainer and spring see Fig 47 b Assemble 108103 spacer onto plunger 108103 SPACER Fig 49 PLUNGER SLOT c With plunger...

Page 49: ...the wooden end plates to the keyboard drill a hole in each end plate as shown in Fig 53 c Insert a 6 40 hex screw 3 4 inch in length through the hole drilled in the end plate and screw it into the th...

Page 50: ...me keyboard repair a The holding fixture is constructed from 1 16 inch thick steel plate b The holding fixture may be made by repair personnel using the dimensions shown in Fig 54 Holes may be drilled...

Page 51: ...the requirement 2 Requirement Forward Positioning The two front bushing clamps should firmly engage the keyboard bushings and hold the printer and rear frame assembly fully forward into the housing w...

Page 52: ......

Page 53: ...drawings are not actually marked on the equipment They are required for identification purposes when referring to other parts of the manual The circuit diagrams in the part with added information on...

Page 54: ...down information to the validation logic which is also internal to MLB1 When a keyswitch has been validated as depressed MLB1 will determine if the code is to be sent as a character or if it is to mo...

Page 55: ...logic card With the decade counter MANUAL 525 4 3 enabled the input clock is divided by 10 and its output drives the second counter stage which is enabled by a low on the master reset MR input The out...

Page 56: ...IC BOTTOM VIEW INORMAlLY I CLOSED z 3 INDICATOR 1 3 I I u SEC n r 3 3 v J l J ov 0 2 13 3 12 4 I I 10 7 MLM BI 82 83 28 27 28 2 24 23 22 21 2 0 10 1 9 II II 12 1 7 MLAI A5 AI 84 NOT PRESENT ON ISSUE l...

Page 57: ...PIN NO 10 II 12 REFERENCE CAPACITOR CIO I Cl 1 93 339002 MLBl B2 31 990 MLB3 404027 MLA4 342238 1LA5 208 RESISTOR IS 2 7 MEGOHM S AND CAPACI TOR IS 22 PF ONISSUE 1G OR HIGHER INTERFACE LOGIC 14 COVER...

Page 58: ...EIIIIUI T REC MSG WTG N LINE DATA START LOCAL TALK ILOCALI START STOP l2 60 KHZ REP AT MOO SERIAL DATA INT RLOCK rw CPS MEMO Y b NCH IN E IS IIIIIIITIII TilT SEARCH fCALL ALARM I ARITY STRING ENTER I...

Page 59: ...3 40 1 2 27 3 54 54 41 13 28 4 55 55 42 14 29 5 56 56 43 15 30 65 57 57 44 16 31 66 sa 58 45 17 32 59 59 46 18 33 S IO 60 47 19 34 5 11 61 48 20 35 512 62 49 21 36 513 22 67 514 63 50 23 68 515 64 51...

Page 60: ...203 SWITCH PACK DESIGNATION SWITCH PACK LOCATION SWITCH NO S P B SWI 204 KEYSWITCH A NO INDICATORS TERMINAL DESIG NATIONS IBOTTOM VIEW I CONTACT l C 1 0 BO TTO M VIEW INDICATOR 205 INTEGRATED CIRCUITS...

Page 61: ...011 0011 5 0 0001 001 I 0001 001I 1 4 0011 001I 52 0001 I 5 0001 0001 0011 16 DOll 0001 54 01 1 0 17 0001 0001 10 0011 7 0001 0 LO I HI s s s s SERIAL SEND DATA T T T T BITS 0 0 0 CHARACTER _ l l 2 p...

Page 62: ......

Page 63: ...AL INDEX 5 13 A GENERAL Parts and unit identification and numbering information for 43K101 50K122 and 43K001 keyboards are provided in this part Units and parts are listed in the index in numerical or...

Page 64: ...l 1 1 l 411 Rl2 l3 t320275 8 RESISTOR lOK Ohl 1 1 MI Rl4 15 315947 2 RESISTOR 51 114 l RC F ESIG 15 r 1a Rl9 R2D 22 l23 R24 26 R27 R23 29 R30 Rl7 R31 32 R33 R34 35 Note Keytops are not part of 410080...

Page 65: ...e Present on early arrangement keyboards MANUAL 525 5 3 Early Design Late Design 346403 RETURN __ _ KEYTOP I I 347149 i 340704 340764 340762 r td 346301 THROUGH 346304 346293 Present With Early Arrang...

Page 66: ...w6 346398 I I I 346386 I 346409 181241 181241 181241 I 346386 REF CIRCUIT CARD ASSEMBLY fi I I 346410 HFlb THER PATENTS PENDING PATE lTED CANADA 1974 I 346709 397 181240 346707 WARNING CONTAINS MOS WH...

Page 67: ...J CTRLI Pj IIT D 1l IIIPTIOII NO IIEQ T 1324 Cji Pj ICITOII I liNE AS Cl 328792 CAPACITOR Ill PF 3349U CAPAC TOR t l NFD l 329785 RES STOR 331 OHM 333417 RES STOR I 321967 OIOOE S tV 431945 LOS C MOS...

Page 68: ...LOCK KEYTOP 420161 346925 420194 Latching Keyswitch Assembly REF PRINTER TEST KEYTOP REF INDICATOR KEYTOP 406631 0 406628 420161 d 119652 420168 0420159 420169 420163 Indicator Keyswitch Assembly 0108...

Page 69: ...L 9 gzg IVONVW OSIO m I I t r I I I I I I OI 9Sl0Zv Z OvZl9l...

Page 70: ...525 5 8 1 410741 CIRCUIT CARD AS D 43K001 RO KEYBOAR S E MttBLY D 151152 w 181241 151152 I I I 346707 181241 I I I I I I I I I I I I...

Page 71: ...ITER 7490 i2 64 3 4 BIT P t WN CTR 5 M AS LBl St l AS M 92 1 ROM 256 X 4 430619 1 SI IITCH 4 S 8 CAPACITOR 0 1 MFD 2 CAPACITOR l O MFD 1 SAME ASC1 2 RESISTOR 6 8K 1 4W 2 RESISTOR 39K 1 411 405092 1 RE...

Page 72: ...I I 525 5 10 D 43K001 RO KEYBOARD Contd 2 MISCELLANEOUS PARTS AND KEYTOPS 346409 346162 L 1 _ 1 I I I 1 I I REF CIRCUIT CARD ASSEMBLy L 346397...

Page 73: ...43 KSR AND RO KEYTOPS c l r J RESET PRINTER TERM DATA ALARM TEST READY 43K001 AAA KEYBOARD LAYOUT RO r J LOCAL AUTO TALK ANSW r J ALARM Present on some keyboards 30 UP CPS lll DN 43K101 CAA CAB OR 50...

Page 74: ...READY SEE Notes 2 5 LOCAL TALK See Note 4 DATA See Notes 2 8 ALARM See Notes 1 2 ON UP PARITY OFF DN HALF UP DUPLEX FULL DN 30 UP CPS 10 DN PRINTER TEST RETURN Old Design See Note 3 RESET See Note 7...

Page 75: ...46558 M E 0346571 R 0346675 T 0346676 y 0346682 A u 0346683 s I 0346684 0 0346685 I p 0346689 D 0346882 On Line K 0347169 WRU L 0347176 J R z 0347182 X 0347183 c 0347256 1 v 0347257 A Blnk B 0347258 R...

Page 76: ...6542 8 0341009 K 0346548 0341010 L 0346549 0341012 z 0346558 M 0341013 X 0346571 0341014 c 0346682 A 0341015 v 0346683 s 0341016 B 0346684 CONTROL ROW ROW5 ROW4 ROW3 ROW2 ROW PART NO KEY DESCRIPTION 0...

Page 77: ...ode 5 340979 Keytop 12 346398 Frame 4 8 328783 Resistor 180 Ohm 2 340981 Keytop 12 346399 Frame 4 8 328785 Resistor 330 Ohm 5 340982 346403 Keytop 3 12 328792 Capacitor 5 thru 346409 Spacer 4 10 12 33...

Page 78: ...e 347176 Keytop13 14 420158 Screw 5 20 Spl 7 453963 Bail3 6 347182 Keytop13 14 420159 Stop13 14 453964 Housing3 347183 Keytop13 14 420161 Retainer6 453968 Capacitor2 347256 Keytop13 14 420162 Magnet6...

Page 79: ...eyboards The keyboard should be properly packed for storage or transportation between service and customer loca tions Packing provides protection against damage or contamination and facilitates storag...

Page 80: ...21307PK bag and tape bag to keyboard Insert KSR keyboard into anti static plastic bag before installing end plates 0 END PLATES 9065PK 9 28153PK Typical 8 Pla es ANTI STATIC PLASTIC BAG 50K122 AAE AAF...

Page 81: ......

Page 82: ...r H Teletype Corporation 5555 Touhy Avenue Skoki_e Illinois 60077 Telephone 312 982 2000 Repair Manual 525 Issue 2 November 1 g1 5 3...

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