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525,2-16

TROUBLESHOOTING (Contd)

43K001 RO KEYBOARD TROUBLESHOOTING (Contd)

TROUBLESHOOTING GUIDE (Contd)

QUESTION

YES

lOc. With MLA3-11 and 8 connected

Go to lOd.

to GND, are MLB2 and MLB3
counting in binary?

lOd. With MLA3-11 and 8 connected to

Go to lOe.

GND, are waveforms at MLB4-12

and 10 present and correct?

lOe. With MLA3-11 and 8 connected

Check START LATCH

to GND are pulses present on

Replace MLB4.

MLA2-8?

11.

Is 0

present on INTERLOCK

Check cable for open

SWITCH, pin 1 when INTERLOCK

circuit.

SWITCH is closed (depressed)?

12.

Is trouble present but not defined

Undefined trouble -

by question 1 through 11?

refer to Circuit Descrip-
tion and Diagrams, etc.

Check ADDRESS COUNTER.

Replace MLB4.

Replace MLA2.

Replace defective keyswitch.

Review initial indication

of trouble.

Note:

Remove GND from MLA3-11 and 8 after correcting trouble (if strapped in Step lOb).

Содержание 43K001/AAA

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

Страница 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...

Страница 4: ......

Страница 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...

Страница 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...

Страница 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...

Страница 8: ......

Страница 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...

Страница 10: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 52: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 62: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 81: ......

Страница 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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