Radio Shack TRS-80 PT-210 Service Manual Download

Page: 1 / 99

Summary of Contents for TRS-80 PT-210

Page 1: ......

Page 2: ...20 RS 232C Interface Option 33 Block Diagram 36 Maintenance Procedure 37 Disassembly Instructions 38 Components 38 Disassembly of PT 210 Portable Data Terminal 39 Replacement and Adjustment within PCB...

Page 3: ...PU Separate units are provided for different functions Pulse motors and solenoid are used as drive sources for mechanicals Simplification is achieved by minimizing the number of mechanical parts Accor...

Page 4: ...haracters Printer Method Non impact thermal paper printing Head life 2 0 million word Paper 8 1 2 100 ft CAT No 76 1003 Character size 2 7 mmX 2 0 mm 7 X 5 dot matrix Line length 8 inches 10 character...

Page 5: ...X 12 5 cm Weight Overall 15 0 pounds 6 8 kg Power Requirements Voltage 105 through 135 volts Frequency 47 through 63 Hz Power Overall 75 watts maximum Environment Temperature Operating 50 to 95OF 10 t...

Page 6: ......

Page 7: ...9 codes generated Printer Non impact thermal paperprinting five by seven 80 characters per line Acoustic Coupler Compatibility Bell system 103A or equivalent Self Test Turning Power on while holding R...

Page 8: ...time I KEYBOARD CONTROL PRINTER 1 I COMPUTER 1 I I I I 1 ACOUSTIC 1 I COUPLER 1 MODEM 1 KEYBOARD CONTROL PRINTER 1 1 Transmit and Receive at same time I I I r I I L I I I I Telephone I I I I I COMPUT...

Page 9: ......

Page 10: ...hen the thermal head advances to position B only dot 4 is heated Identically as the thermal head advances and the row of dots reaches positions C D and E dots 41 4 and 1 7 are heated and pattern H is...

Page 11: ...timing belt 2 through the motor timing pulley l on the motor shaft Assembly Figure 7 The motor causes the thermal head A to move in the direction of X axis a distance that corresponds to the size of...

Page 12: ...on of Y axis by a distance of 1 line that is it moves 4 23 mm 1 6 after 6 pulses of the LF motor control signal The thermal head is not in contact with the ther mosensitive paper during line feed due...

Page 13: ...hat a print can be made at any time It is possible to adjust the pressure of the thermal head applied to the thermosensitive paper by chang ing the tension of the tension spring located at the end of...

Page 14: ...t into digital signals and then transmits them to the control side The configuration can be divided into a speaker output unit a microphone input unit and a modem board unit Coupling transmission rece...

Page 15: ...d Data Receives data signals transmitted from the modem and transfers them to the con trol side TxD Transmitted Data Transmits data signals data signals produced from the control side are transmitted...

Page 16: ...n Modulator Jl A I TxD INH SP 7405 OUT Figure 12 Audible sound data is output to SP OUT and a digital signal is input to TxD when signal L transmis sion enable is input to INH The timing chart is as f...

Page 17: ...a signal input through MIC IN is amplified by the amplifier its noise is cut by the band pass filter and it is then input to the demodulator The demodulator contains a frequency comparison circuit and...

Page 18: ...TART Bit 1 STOP Bit Parity Bit Odd or Even Mark 1 2 110 Baud 100 mS Mark 1 DATA Bit 7 Bits START Bit Parity Bit Odd or Even Mark RxD TxD Odd Even Parity Space 1 Bit1 DATA Bit 7 Bits 1 1 Bit1 2 Bits I...

Page 19: ...ce I DATA Bit START Bit STOP Bit 110 BPS Transmitter STOP Bit 110 300 BPS Parity Bit I ON LINE OFF LINE IN DSR Data Set Ready RxD Received Data INH Inhibit TxD Transmitted Data TxD IN DATA Bit cSTART...

Page 20: ...escription of Keyboard Interface Circuit Key Board LINE FEED 1 ESC I D BACK SPACE 1 m I RETURN I PAPER ADV 1 Key Matrix I SPEED t I SHIFT 1 I CTRL 1 Control Key Board nterface S379C 5 MODE M Figure 17...

Page 21: ...er ON or when the PT 210 Portable Data Terminal operates Item I Protective function 5 short 1 protection by IC3 on the power supply board AC line primary side short 1 Protection by NFB No Fuse Breaker...

Page 22: ...AD ERROR LED POWER LED 5V VCC On Off line select signal Numeric 10 key mode select signal Repeat signal Carrier indicating LED Error indicating LED Power indicating LED 5V power supply for logic 12V p...

Page 23: ...Drive signals to transistors of the Y motor photo interrupt signal I 1 6 1 Head release solenoid signal 1 Drive signals to transistors of the thermal matrix...

Page 24: ...Figure 1 10 Control Logic Block Diagram 0 0 0 c Ill 0 E v 0 I l l c o 0 J J 0 1 05 r L I Figure 18 22...

Page 25: ...pCPU control 8 E P ROM 4K byte E P ROM USART Universal Synchronous Asynchronous Receiver Transmitter USART is used for the peripheral circuit and programming is done through the CPU USART receives pa...

Page 26: ...CPU Controls the l F Circuit INITIAL...

Page 27: ...PRINT OUT 0 NUM S W SEARCH DG OUT I FIFO FULL MODEM F...

Page 28: ...CHARAC ER GENEFtATOR ADDRESS SET 1CHARACTER F l...

Page 29: ...xcitation of the carriage return and line feed motors When L is input to the PROG terminal in accordance with an instruction from the pCPU a motor 0x citation signal is output to an 1 1 0 expansion po...

Page 30: ...Carriage Return Motor Excitation in 4 X direction Excitation in X direction Line Feed Motor Figure 21 Timing Chart 28...

Page 31: ...ing 0 The PAPER ADV key is kept pressed 11 I O Port 8243 f7t Jr MGND Figure 22 VMM 7 5V which is commonly used for the carriage return motor and the line feed motor is also used as the power supply fo...

Page 32: ...or printing with dots when the thermal head is heated by data pulses which are processed by the pCPU and then driven by the transistors Control Logic I Head Figure 23 VTT 4 5 0 6 1V is used as the pow...

Page 33: ...start position a During carriage return it detects an signal sends a signal to the pCPU and causes the carriage return motor to stop Light emitting element Light emitting Light receiving element Photo...

Page 34: ...k Parity error lamp lights up when DATA Bit I Parity Bit Odd number ODD check Parity error lamp lights up when DATA Bit 4 Parity Bit Even number NONE No parity check is made No error indication is mad...

Page 35: ...ication equipment This signal is required by the terminal equipment to control the direction of data transmission by the data communication equipment On one way or duplex chan nels the off condition m...

Page 36: ...Interface Signal Pin Assignment Pin 13 Pin 1 Figure 27 I 1 pin 1 Signal name Signal name 4 RTS 17 NC 5 CTS 18 NC 7 SG 20 DTR 8 CD 21 NC...

Page 37: ...p I START Bit 1 LSTOP Bit Parity Bit Odd Even Mark 100 mS Mark RD SD Odd Even Parity START Bit Parity Bit Odd Even Mark I I NON Parity DATA Bit 7 Bits I STOP Bit START Bit NO parity Bit CTS Clear to S...

Page 38: ...1 power supply unit T Printer Unit Fro Board 4 5 0 6 1V Control Unit J Handset...

Page 39: ......

Page 40: ...sassembly Instructions Components Portable Data Terminal Upper Cover Unit Keyboard Unit Modem PCB Unit Control Unit A Power supply Unit I b d RS 232C Cat No 76 1002 Optional Board Figure 31 Base Cover...

Page 41: ......

Page 42: ...Unit Removal of Rear Cover Open the rear cover at a 4 5 angle to the Upper Cover Bend the rear cover 3 as shown in Figure 33 and remove the axis of rotation from the Upper Cover unit Removal of Option...

Page 43: ...r Unit Modem Unit Control Board Unit Power Supply Unit 6 Optional Board Base Cover Note There is need to loosen any screws to re move the above unit except the one for the Power Supply Unit Figure 35...

Page 44: ...the CR motor assembly and the LF motor assembly and then remove the two screws at the frame ground wire of the C R motor assembly and the LF motor assembly 3 Disconnect the C R motor s lead wires and...

Page 45: ...Base Cover as shown in Figure 40 Figure 40 4 In rt der to dismount the Modem Unit deform the front portion of the Base Cover by forcing it in the direction of arrow K shown in Figure 41 and disengage...

Page 46: ...e Modem Unit from catches T and 2 on the other side The Modem Uni becomes free How to Dismount the Control Unit 1 In order to dismount the Control Unit first dismount the Printer Unit and the Keyboard...

Page 47: ...nected from the keyboard connector 2 the C R motor connector 0 the photo interrupter connector 04 the LF motor connector OS the solenoid connector etc 7 Push the Control Unit against catches and 8 Dis...

Page 48: ...ove it from its guides and connector 5 Remove the four screws 2 retaining the Power unit 6 Disengage the Power Unit 5 from catches 3 and 4 The Power UnitCS is then free and can be removed when it is g...

Page 49: ......

Page 50: ...he Holder Shaft and take out the Holder Shaft 3 Separate the Lower Guide and the Paper Cutter Remove the Paper Lock Spring from the Paper Cutter and install it on the new Paper Cutter Figure 46 5 Comb...

Page 51: ...o not tighten the Motor Set Screws yet Hook the Timing Belt to the Motor Timing Pulley and install the Timing Pulley on the Motor Shaft Set the position of Motor Timing Pulley so that it is 10 mm from...

Page 52: ...ut the LF Motor Set Screw and disconnect the connecter from the control P C B Motor Timing Pulley Figure 49 3 Attach the New LF Motor to the Motor Timing Pulley The distance between motor shaft and pl...

Page 53: ...nd Motor Timing Pulley should be installed 6 mm from the Motor face see Figures 49 50 Replacement of the Solenoid Refer to Figure 49 1 Remove the Tension Spring from the Solenoid plunger 2 Take out th...

Page 54: ...Refer to Figure 49 Thermal Head Assembly Replacement 10 Adjust the Thermal Head Assembly pressure as follows Using a Spring Gauge push on the bottom of the Thermal Head Assembly at point B Adjust the...

Page 55: ...e CR Motor Timing Pulley Follow the instructions given earlier in this section The CR timing belt can be separated from the Printer Unit In order to install a new belt fit the belt on the motor timing...

Page 56: ...d Improper paper may cause damage to the Thermal Head Open the cover to make contrast adjustments to the Variable Resistor VR 1 see Figure 53 Turn clockwise to increase contrast To decrease con trast...

Page 57: ...frequencies from 1 to 3 k Hz is required for adjustments Receiving Frequency Adjustment VR1 See Figure 55 Power ON I i Set Speed S W to 300 Baud i Set Mode S W to ON LINE Ready to Adjustment Connect t...

Page 58: ...ust for correct printing Adjustable range Figure 57 Remarks The reference frequency is determined by time constants of VR1 R16 and C11 For making adjust ments input an analog data signal to MIC IN and...

Page 59: ......

Page 60: ...1 270 Hz is determined by time constants of YR2 R26 VR3 R27 and C17 For adjustment set TxD terminal to L level and turn VR3 Note In order to make an adjustment in audible sound of 1 070 Hz and 1 270 H...

Page 61: ...61 Troubleshooting 1 Problems at Power ON 03estore Time 1POWER ON 1 Jump to the step following operation Input voltage the power connector the power unit Replace the contml...

Page 62: ...9roblerns in Operation Reset the CR motor connector Reset the LF motor...

Page 63: ......

Page 64: ......

Page 65: ...OPTION E1 Replace the host computer control ves Replace the RS 232Gcontrol connector EXCHANGE S W w Replace the RS 232C EXCHANGE S W I unit I...

Page 66: ......

Page 67: ......

Page 68: ......

Page 69: ......

Page 70: ......

Page 71: ...Power Supply Board Assembly Top View GRN F G GRN ACN ACH WHI BLK l 2 BLK WHI ON SWI OFF T l JPI JP2 C14 41 I I C12 ClI I l l C13 I T T F 2 FAN BLUE RED 5 BLUE 6 v I 0 7 YEL WER 9 BRN cia 3 RED 4 ORN...

Page 72: ......

Page 73: ......

Page 74: ...8 Wiring Diagram FAN Modem Unit I I I Power Supply Board 1 1 AC Line DC Line Signal Line Keyboard Unit...

Page 75: ...AR2 AR3 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 DESCRIPTION 4700 5 1W METAL FILM 2200 5 1 4W CARBON FILM 100K0 5 1 4W CARBON FILM 330 5 1 4W CARBON FILM 470 0 5 1 4W CARBON FILM 4700 5 1 4W CARBON FILM...

Page 76: ...Y 2SC2655Y 2SC2655Y CONNECTORS 7P 5045 07A 7P 5045 07A 8P 350212 1 FF 09B 003 RS PART NO W1ANUFACTURER PART NUMBER 1EF NO DESCRIPTION HEADER 34P FF 10 001 HKP 16FD2 3AT 4P 5045 04A 3P 5045 03A C S HD7...

Page 77: ...ON 100V 1A SILICON 100V 1A SILICON 100V 1A SILICON 100V 1A SILICON 100v 1A SILICON 100V 1A SILICON 100V 1A SILICON 100V 1A SILICON 100V 1A SILICON 100V 1A SILICON 100V 1A SILICON MISCELLANEOUS 1 C SOC...

Page 78: ...VR2 VR3 C1 C2 C3 C4 C5 C6 C7 CB C9 C10 C11 C12 C13 C14 C15 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 DESCRIPTION 1OKft 5 1 4W CARBON FILM 470Kft 5 1 4W CARBON FILM 2 7MO 2 5 1 4W CARBON FILM 10KO 2 5 1...

Page 79: ...I D I D r m m m CMCM MCMCMm m m m m m 0IDID no 7 r CMCMCMCMCMO I D I D I D I D I D t m m m m m 0 0 0 in m m C M r 0 0 m CM T O T O 5 E E E E a 4 4 a 2 0 CM 0 0 CM CM CM r r r 7 7 7 a a a...

Page 80: ...pF 20 to 80 50V CERAMIC 0 1pF 20 to 80 50V CERAMIC 0 1pF 20 to 80 50V CERAMIC 0 1pF 20 to 80 50V CERAMIC 0 01MF 20 to 80 125V CERAMIC RS PART NO AX9268 AN0306EE8 AP7307 ACC103ZmCP ACC103ZrnCP ACC474ZM...

Page 81: ...CT 5298T CONTACT 5298T CONTACT 5298T CONTACT 5298T CONTACT 5298T CONTACT 5298T CONTACT 5298T CONTACT R1 25 3 40 FUSE BREAKER POWER SWITCH U21L3D9 V60 Q TRANSFORMER EONTACT 171255 1 CONTACT 171255 1 RS...

Page 82: ...20 to 80 50V CAPACITOR SN 75154 TTL SN 751SOP TTL IS1588 SILICON IS1588 SILICON IS1588 SILICON TS1588 SILICON IS1588 SILICON dKP 16ML 3AT GMM 25RFDA SWITCH SUJ12A SWITCH SUJ12A PHILIPS FRANCE SCREW M...

Page 83: ...ER BASE COVER UNIT BOTTOM COVER RETAININGPLATE RUBBER FOOT AC CAP FAN ASSEMBLY FAN MOTOR PROPERA FAN FAN BRACKET FAN ANGLE HANDLE RUBBER BUSH VARIABLE RESISTOR VOLUME COLOR FAN MOTOR RUBBER WASHER FAN...

Page 84: ...LATE UNDER HEAD ASSEMBLY NON REPAIRABLE ASS Y THERMAL HEAD ASS Y NON REPAIRABLE ASS Y TENSION PLATE FG CABLE LF SOLENOID CR RS PART NO Axx5036 AHC1751 AHC1752 ART4373 ARB7602 Am4695 AB6566 ARA0455 AHC...

Page 85: ...215912 I 2 KEY TOP 2 KEY TOP 1 2 1KEY TOP 86215915 I 1 2 1KEY TOP 1 86215916 1 1 2 1 KEY TOP fi 1 1 86215917 1 KEY TOP Q KEY TOP W KEY TOP E KEY TOP R KEY TOP T KEY TOP Y KEY TOP A KEY TOP S KEY TOP D...

Page 86: ......

Page 87: ...10 Exploded Views...

Page 88: ......

Page 89: ......

Page 90: ...1I Schematic Diagrams wow...

Page 91: ...PHOTO SUPPLY...

Page 92: ...14LSOZ P73 Pie Vet vcc 8 P a 7 PROS PW 23 CPU 7 8039 D l I l l...

Page 93: ...CONTROL LOGIC 2 2 c...

Page 94: ...MIC 1H 201 0 2BZ2 7 SP OUT...

Page 95: ...MODEM LOGIC 2 2...

Page 96: ...POWER SUPPLY LOGIC...

Page 97: ...RS 232C INTERFACE LOGIC 1 2 76 1002 Option...

Page 98: ...RS 232C INTERFACE LOGIC 2 2 Option 76 1002...

Page 99: ...U S A FORT WORTH TEXAS 76102 CANADA BARRIE ONTARIO L4M 4W5 TANDY CORPORATION AUSTRALIA BELGIUM U K 280316 VICTORIA ROAO PARC INDUSTRIEL DE NANINNE BILSTON ROAD WEONESBURY RYDALMERE N S W 2116 5140 NAN...

Search results

Summary of Contents for TRS-80 PT-210

Reviews:

Related manuals for TRS-80 PT-210

Brands by name

Popular brands

Radio Shack TRS-80 PT-210, Service Manual

Search results

Summary of Contents for TRS-80 PT-210

Reviews:

Related manuals for TRS-80 PT-210

Brands by name

Popular brands