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Teletype 43K001/AAA Repair Manual

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  • Page 1 Used 42143 BASIC TERMINALS --·...
  • Page 2 © 1978, 1980, 1981, 1982 and 1983 by Teletype Corporation All rights reserved Printed in U.S.A.
  • Page 3 The 43 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.
  • Page 5 ION PRODUCT SERVICE AND EDUCATION SERVICES PRODUCT SERVICE On the following page is a list of Teletype Corporation Product Service locations which provide maintenance repair and service on all Teletype Corporation products. For 24 hour information concerning service call toll free: 800/942-4192 u.s.
  • Page 6 Only the manu­ Norfolk Washington Eau Claire facturer of equipment being serviced can Wausau Edison Oakland offer this total support effort ... Teletype Fairfield Oklahoma City Corporation Product Service ... the Fort Lauderdale Omaha complete resource. Call Toll Free 8001323-4226...
  • Page 7 43 Teleprinter Terminals are required to test and troubleshoot the keyboard when not installed on location. Spare parts for repair are available from Teletype Corporation. Repair per­ sonnel should be properly trained and have access to these spares before attempting repair of the 43 keyboards.
  • Page 9 • The 43 KEYBOARD REP AIR MANUAL TABLE OF CONTENTS GENERAL DESCRIPTION PARTl PART2 TROUBLESHOOTING PART3 DISASSEMBLY /REASSEMBLY AND ADJUSTMENTS PART4 CIRCUIT DESCRIPTION AND DIAGRAMS PARTS AND UNIT CODES PART5 PACKING AND MARKING PART6 • • �·...
  • Page 11 All ordering numbers shown in this manual are Teletype Corporation part numbers. When ordering replace­ ment parts, unless otherwise specified, prefix each part number with the letters "TP" (ie, TP410055) .
  • Page 12 525,1-2 KEYTOP ARRAN GEMEN TS (Contd) OPERATIONAL STATUS CONTROLS INDICATORS PRINTER TERM RESET DATA ALARM TES T READY Fig. 1-43K001/AAA Used in 43 Basic RO Terminal OPERATIONAL CONTROLS STATUS INDICATORS t:=l � � � ON-UP HALF-UP PRINTER 30-UP LOCAL AUTO...
  • Page 13 525, 1-3 MANUAL STATUS INDICATORS OPERATIONAL CONTROLS ••• < BUlK ••• BASIC KEYBOARD Fig. 4-50Kl22/AAG Keyboard in 42 Terminal Used Basic STATUS INDICATORS OPERATIONAL CONTROLS • • BASIC KEYBOARD Fig. 5-50K122/AAM Keyboard in 42 Terminal Used Basic With Buffer �· �.
  • Page 14 525,1-4 REFERENCES The 42 and 43 Teleprinter Technical References provide additional descriptions of the station compo- · nents, features, applications, and interfacing. · The 369 and 538 Service Manuals provide all necessary information for trained 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 component of the 42/43 Terminal.
  • Page 15 The keyboards are returnable to the Teletype Product Service Center for repair as a unit. Pack in carton (KSR keyboards- using conductive plastic bag) that was used to pack replacement keyboard. High vol­...
  • Page 16 525,2-2 TROUBLESHOOTING 43K101 KEYBOARD TROUBLESHOOTING TROUBLESHOOTING GUIDE QUESTION Does failure involve either an Go to 2. Go to 12. operational control or a station indicator? With power applied are any of the Go to 5. Go to 3. communications mode indicators; LOCAL (LOCAL TALK), DATA, TERM READY (AUTO ANSW) lit? Is ALARM indicator lit (paper...
  • Page 17 MANUAL 525, 2-3 QUESTION • Does INTRPT indicator light when Go to 20. Go to 18a. remote station sends an on-line interrupt? Does ALARM indicator light when Go to 11. Go to lOa. the INTERLOCK keyswitch is released up (cover open)? lOa.
  • Page 18 525,2-4 TROUBLESHOOTING (Contd) 43K101 KEYBOARD TROUBLESHOOTING (Contd) TROUBLESHOOTING GUIDE (Contd) QUESTION Is -12 V present on pin 2 of circuit Go to 18a. Check for open circuit in card cable conector P107 (if any cable. keyswitches light go to Step 18a)? 18a.
  • Page 19 MANUAL 525, 2-5 • QUESTION Is 560 KHz clock present on pin 1 of Check clock generation Check cable for open • MLB3? and driver circuitry. circuit. 24 . Is depression pulse present on Sense Go to 25. Check visually for a short Amp input with keyswitch in question between terminals of the key- depressed?
  • Page 20 525, 2-6 TROUBLESHOOTING (Contd) 43K101 KEYBOARD TROUBLESHOOTING (Contd) TROUBLES HOOTING GUIDE (Contd) QUESTION 28b. Is depression pulse present on Replace defective sense Replace MLA5. keyswitch logic inputs MLA5-10, amp . 11 or 12 with no keys depressed? Review initial indication Is trouble present but not defined? Undefined trouble - of trouble.
  • Page 21 MANUAL 525, 2-7 • 410080 CIRCUIT CARD COMPONENT LAYOUT DODD ("r. R.) (I... O CA L I • (A.A.) (INT.) (ALM.) (L/TI c@D=o � � � � � : 1 L �� 1 � 1 � � [J " D ' " (ESC) '"...
  • Page 22 � !=tl t-:l > t-:l ..� � t<:l t:;j CONTROL SENSE AMPS tiNSHTFT SHIFT C':l Sen,gp SensP :Jat a Positive Logic BB 8 18 2 8 B h 8 5 8 4 J B 2 B 1 "t FnahlP Switch Address...
  • Page 23 • • SHIFT SENSE AMPS UNSHIFT CONTROL Senae Sense Data Poaittve Logic 8 6 8 5 8 4 8 3 8 2 8 1 8 0 8 7 8 8 3 8 2 8 1 Alop Switch Address Enabl e Character Character Character...
  • Page 24 525,2-10 TROUBLESHOOTING (Contd) 50Kl22 UNITIZED KEYBOARD TROUBLESHOOTING TROUBLESHOOTING GUIDE QUESTION Go to la. Do any indicator keys fail to light? Go to 2. Is -12 V present on pin 4 of LED of Go to lb. Check circuit card or cable for open circuit.
  • Page 25 MANUAL 525, 2-11 • QUESTION • Go to 9. Does keyswitch in question meet Replace defective key- the mechanical requirements switch. (depress and release properly, latch, click, etc.)? Is trouble present but not defined? Undefined trouble - Review initial indication refer to circuit descrip- of trouble.
  • Page 26 525,2-12 TROUBLESHOOTING (Contd) 50K122 UNITIZED KEYBOARD TROUBLESHOOTING (Contd) 410101 CIRCUIT CARD COMPONENT LAYOUT •• •• •• •• �o{UJP EJE:JEJ�� c::: ::J � c:::J CJ c:::J � c;J Q � HLB1 � EJ EJ E:=J EJ EJ E:J � � � EJ �c:::J c:=J c::J c: :=J c: :=;] c: :: :J �...
  • Page 27 MANUAL 525, 2-13 TRANSMITTED CODES (Excluding Start and Stop) UN SHIFT SHIFT CONTROL BBBBBBBBB BBBBBBBBB DRIVE SENSE CHARACTER CHARACTER BBBBBBBBB CHARACTER 876543210 8765432 I 0 876543210 Non-Send Non-Send Non-Send DUPLEX Non-Send Non-Send DUPLEX Non-Send DUPLEX Non-Send PARITY Non-Send Non-Send PARITY PARITY Non-Send PTR TEST...
  • Page 28 525-2-14 TROUBLESHOOTING (Contd) 50K122 UNITIZED KEYBOARD TROUBLESHOOTING (Contd) TRANSMITTED CODES (Excluding Start and Stop) (Contd) UN SHIFT SHIFT CONTROL BBBBBBBBB BBBBBBBBB BBBBBBBBB DRIVE SENSE CHARACTER CHARACTER CHARACTER 876543210 876543210 876543210 001111011 001111101 100011111 100001101 RETURN 100001101 RETURN 111110111 ( F7 ) No Key No Key No Key...
  • Page 29 MANUAL 525, 2-15 43K001 RO KEYBOA RD TROUBL ESHOOT ING TROUBLESHOOTING GUIDE QUESTION Do any indicators fail to light? Go to 6. Go to 2. Is the test message printed while Go to 3. Go to 7. the PRINTER TEST key is depressed? Does the TERM READY indicator Go to 4.
  • Page 30 525,2-16 TROUBL ESHOOTI NG (Contd) 4 3K001 RO KEYBOARD TROUBLES HOOTING (Contd) TROUBLES HOOTING GUIDE (Contd) QUESTION lOc. With MLA3-11 and 8 connected Go to lOd. Check ADDRESS COUNTER. to GND , are MLB2 and MLB3 counting in binary? With MLA3-11 and 8 connected to Go to lOe.
  • Page 32 525,2-18 TROUBLESHOOTING (Contd) 43K001 RO KEYBOARD TROUBLESHOOTING (Contd) TEST POINTS AND VOLT AGE READINGS Use Volt-Ohm-Milliammeter de Volts Scale. Voltage readings are approximate and may be higher Note: or lower than those specified, depending on meter used. MLA1-7 Depress Reset Switch. Meter will momentarily deflect from +4 V to +3.9 V. MLA1-9 Depress and release Printer Test Switch.
  • Page 33 346257 Keyswitch Extractor Note: All part numbers shown in this manual 420204 Keytop Extractor are Teletype Corporation part numbers. When 346392 ordering replaceable components, unless otherwise Static Discharge Strap Customer Provided Soldering Iron (Low Wattage) specified, prefix each part number with the letters...
  • Page 34 525, 3-2 DISASSEMBLY/REASSEMBLY 43K101 KEYBOARD (KSR and R O) Spacebar Mechanism (Early Design) To remove the spacebar mechanism: SNAP DETENT Disengage the leaf spring (bronze colored) from the wire bail using a spring hook and Fig. 4-Wire Bail Removal pull toward the front (Fig. 2). To reassemble the spacebar mechanism: SPACE BAR BUMPER...
  • Page 37 MANUAL 525,3-5 To reassemble the early design keytop with hous­ Key switches • ing: To remove the key switches: Insert housing with key; observe position of locat­ ing lug on housing and press into channel. Housing Remove keytop. must snap full y into front and rear channel tines. Remove four screws...
  • Page 38 525, 3-6 DISASSEMBLY (REASSEMBLY (Contd) 43K101 KEYBOAR D (KSR and RO) (Contd) Remove the circuit card cover located in front of the control keys from the channel. Use a spring hook to remove the cover from To reassemble the keyswitch: the mounting posts (Fig.
  • Page 39 MANUAL 52 5 , 3- 7 To reassemble the cable: Cut the cable tie securing the cable to the circuit card. Insert new cable connector into circuit card holes and press into place. Hold cable Remove the screw securing the right rear connector in place and resolder.
  • Page 40 525,3-8 DISASSEMBLY/REASSEMBLY (Contd) 43Kl01 KEYBOAR D (KSR and RO) (Contd) If removing Channel No. 4, re l? ove screw and locating plate from left s1de of key­ Channel (KSR) board (Fig. 29). To remove the channel: Remove all keytops associated with chan­ nel to be replaced.
  • Page 43 MANUAL 525, 3-11 To reassemble the channel: Slide channel to the left and engage tines on left side frame (Fig. 34). Left side has curved slot; right side has square slot (Fig. 35). Note: CHANNEL LEFT SIDE FRAME Fig. 34-Channel Engagement ----r:- __ _: : �-.:r::: :- :- -r-- .
  • Page 45 MANUAL 525, 3-13 50K122 UNITIZED KEYBOARD To install spacebar, insert the wire bail in its guide slots and while engaging the Spacebar Mechanism spacebar with its guide and the wire bail, push down on the spacebar until the tab on the left To remove the spacebar mechanism: side latches into the guide.
  • Page 47 MANUAL 525, 3-15 Remove the keytop and plunger retainer Remove the latching cam by grasping it's from the upper plunger. ring and pulling cam out of the housing. (Fig. 46.) Slide the upper plunger out through the bottom of keyswitch housing (Fig. 45 ). Remove the latch magnet and latch keeper by slipping them off the latching cam.
  • Page 50 525,3-18 50K122 UNITIZE D KEYBOA RD (Contd) Holding fixture for high volume keyboard repair: The holding fixture is constructed from The holding fixture may be made by repair 1/16 inch thick steel plate. personnel using the dimensions shown in Fig. 54. Holes may be drill ed in fixture base to secure it to a repair bench.
  • Page 51 MANUAL 525, 3-19 ADJUSTMENTS Keyboard to Cover Alignment The following two requirements must be met: ( 1) Requirement Left to Right Positioning- When the free play movement of the cover (left to right) is taken up lightly in each direction, the cover should not touch any keyboard keytops.

  • Page 53: Table Of Contents

    43K001 RO KEYBOARD ..grams with each major component on a single sheet. The package of diagrams can be ordered SEND DATA OUTPUT ..from Teletype Corporation as Manual 385, 43 Teleprinter Circuit Diagrams. START CONTROL ... START LATCH .....

  • Page 54: Keyswitch Logic

    525, 4-2 KEYSWITCH LOGIG When a keyswitch has been validated as depressed, MLB1 will determine if the code is to be sent as On each scan, the keyswitch logic transmits a a character or if it is to modify the code of SYNC pulse to establish synchronization.

  • Page 55: Start Control

    MANUAL 525, 4-3 enabled, the input clock is divided by 10 and its the printer logic via the send data output pin 6 . output drives the second counter stage which is character information is mark-space data enabled a low on the master reset (MR) encoded in ASCII* or extended ASCII conforming input.

  • Page 56: Circuit Diagrams

    525, 4-4 CIRCUIT DIAGRAMS 43KIOI/CAA AND CAB INFORMATION N'JTES: 201. ALL R£SIS TANC£ "VALUES IN OHMS UNLESS 204. INTEGRATED CIRCUITS-EXTERNAL VtEW AND LEAD 205. CONN ECTOR TERMINATION O THERWISE. SPECtH£0. DESIGNATION : ION CIRCUIT CARD): 202. ALL CAPACIT ANCE MICROFARADS UNLESS SPECIFIED.
  • Page 57 MANUAL 525, 4-5 • ..LOOIC ZOIS. SENSE CI-1AR T: INTEGRATED CIRCUIT PART NUM8£RS SENSE AMP SENSE SENSE SENSE PART NO DF.SJGNATION ..PIN NO. IMLA61 (ML841 IMLAI} 342280 MI.Al,A6,B4 KE)'TOP MLBl, B2 339002 I LEFT) SHIFT (RIGHT II CONTROL MLB3 31&990 4040 27...

  • Page 58: Logic

    � t-.j � � > > tr:l > > > ALAIIII I � tr:l S TOP IliAD\' AUTO Alii (TUM. SND ROY SEND PREP IIITEIIIIUI'T > START LOCAL/TALK ILOCALI ..START /STOP ..l2 / �6 0 KHZ ..
  • Page 59 MANUAL 525, 4-7 SENSE AND DRIVE LINE CHART CONNECTOR TERMINATION ON CIRCUIT CARD MLB I SEE FIG U RE KEY SWITCH POSITION NOS. BELOW SENSE DRIVE S IO 5 11 KEYSWITCH POSITION NUMBERS IN D ICATOR INTERLOCK GJ0 00...

  • Page 60: 43K001/Aaa Keyboard Logic

    525, CIRCUIT DIAGRAMS (Contd) 43K001/AAA KEYBOARD LOGIC CIRCUIT NOTES: INFORMATION NOTES: INFORMATION NOTES CONT. VO LTAGE VOl TAC.E RANGE 1/4 WATT AND VALUES INTEGRATED CIRCUITS- EXTERNAL VIEW AND RESISTORS IN OHMS UNLESS OTHERWISE SP ECIFIED. LEAD DESIGNATION: +4.!) 10 ALL CAPA CITORS VALUES IN MICROFARADS .

  • Page 63: General

    MANUAL 525, 5-1 PART 5 -PARTS AND UNIT CODES • CONTENTS PA GE GENERAL ..............• 43K101 KEYBOARD ............5- 2 410080 CIRCUIT CARD ..........MISCELLANEOUS PARTS .
  • Page 64 525, 5-2 43K101 KEYBOARD 410080 CIRCUIT CARD 312918 CABLE TIE 346102 ..,. (lOCAL) 346162 346106 !46166 (L/T) ! INT.) !ALIItl.) (CPS I -{IDo offiP -@]- o@lP r--- -, 410080 "340988 (REPT.) ISSUE NUMBER Not Present KEYTOP on Issue 1A PART NO. (Not Part REF.

  • Page 65: Miscellaneous Parts

    MANUAL 525, 5-3 MISCELLANEOUS PARTS � � Early Design Late Design � Early Design Late Design 346403 347149 346234 � RETURN ,.._ _ _ � KEYTOP I� :::- -eB 340704 346235 340764 INDICATOR 34700 6 HOUSING • • 340762 • 346293 (Present With Early Arr a nge­...

  • Page 67: 50K122 Keyboard

    MANUAL 525, 5-5 50K122 KEYBOARD 410101 CIRCUIT CARD 430619 346395 CABLE ASSEMBLY •• •• •• •• •• c::: :J � lli::: :J ffi::: :J [LJ � � � HLB1 E:J � E=:J E=:J � E::J c=J FS12 I IDJ-S1J � c::J l::J :"·"...

  • Page 68: Miscellaneous Parts

    525, 5-6 50Kl22 KEYBOARD (Contd) MISCELLANEOUS PARTS REF CONTROL REF DATA OR CAPS LOCK KEYTOP 420161� � 420162 � 420179 S pacebar Mechanism 346925 420183 420194 346926 Data Keyswitch Assembly . Latching Keyswitch Assembly KEYTOP REF PRINTER TEST KEYTOP 420161 (')119652'-@ 420191 420168...
  • Page 71 525, ·5-9" . MANUAL 312918 CABLE TIE 346395 CABLE ASSEMBLY © � 1 ,._ _ � �oo ��e ® ®e 11 0 • N OFF: @� � 0 0 PARITY- SPEED "' � � ® � ® ; c::: :c:J �...
  • Page 73 MANUAL 525, 5-11 KEYTOPS BASIC 43 KSR AND RO KEYTOPS r::: :: :: ::J TERM DATA ALARM PRINTER RESET READY TEST 43K001/AAA KEYBOARD LAYOUT (RO) Present on some keyboards. § § LOCAL AUTO TALK ANSW r::: :: :: ::J 30·UP ALARM...
  • Page 74 Note 2: 346409 spacer must be installed under the 346162, 346163, and 346127 key to block the action of the ALARM, TERM READY and DATA keyswitches on the 43K001/AAA keyboard. Note 3: The 340764 compression spring between the 346403 key and the housing must be ordered separately.

  • Page 76: Keytops

    525,5-14 KEYTOPS (Contd) BASIC KSR AND RO KEYTOPS (Contd) 50K122/AAM CONTROL ROW ROW5 ROW4 ROW3 ROW2 ROW! PART NO. KEY DESCRIPTION PART NO. KEY DESCRIPTION PART NO. KEY DESCRIPTION 0340829 0341017 0346685 0340830 0341019 2 -:- 0346689 & Blank (Row 0340867 0346691 Shift...

  • Page 77: Numerical Index

    MANUAL 525, 5-15 NUMERICAL INDEX Note: When ordering parts prefix each number with the letters "TP" unless specified otherwise. Part Part Description and Description and Part Description and Number Page Number Number Page Number Number Page Number 108103 Washer, Flat 6 340838 346127 Keytop 10,12...
  • Page 78 525,5-16 (Contd) NUMERICAL INDEX Description and Part Description and Part Description and Part Page Number Number Page Number Number Page Number Number 346847 Keytop 14 406631 Lens 6 420188 Bar , Spacer 6,12 Spring 6 346880 Keytop 14 409101 Board , Circuit 5 420191 Cam 6 Keytop 13,14...

  • Page 79: General

    MANUAL 525, 6-1 PART 6- PACKING AND MARKING CONTENTS PAGE GENERAL ..........
  • Page 80 ANTI STATIC PLASTIC BAG 50K122/AAE, AAF, AAG and AAM Keyboards . e, · END PLATES "" 21307PK 9065 PK 43Kl01/CAA and CAB Keyboards 9> 28153PK (Typical 8 Pla('es) 43K001/AAA RO Keyboard...
  • Page 82 � . ·r., Teletype Corporation 5555 Touhy Avenue, Skoki_e; Illinois 60077 Repair Manual Telephone: (312) 982-2000 Issue November 1 g1:5;3...

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