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Brother PT-530 Service Manual

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  • Page 2 SERVICE MANUAL MODEL: PT-530/550...
  • Page 3 © Copyright Brother 1997 All rights reserved. No part of this publication may be reproduced in any form or by any means without permission in writing from the publisher. Specifications are subject to change without notice.
  • Page 4 PREFACE This publication is a service manual covering the specifications, theory of operation, disassembly/reassembly procedure, and troubleshooting of the Brother PT-530/550. It is intended for service personnel and other concerned persons to accurately and quickly provide after-sale service for our PT-530/550.
  • Page 5 Chapter I. SPECIFICATIONS...

  • Page 6: Table Of Contents

    CONTENTS MECHANICAL SPECIFICATIONS ............... I-1 1.1.1 External Appearance ..................I-1 1.1.2 Keyboard ....................... I-1 1.1.3 Display ......................I-2 1.1.4 Printing Mechanism ..................I-2 1.1.5 Tape Cassette ....................I-3 1.1.6 Tape Cutter ....................I-4 1.1.7 Lettering Stick ....................I-4 1.1.8 PC Interface (not provided on the PT-550/530 USA versions.) ...... I-4 ELECTRONICS SPECIFICATIONS ..............

  • Page 7: Mechanical Specifications

    1.1 MECHANICAL SPECIFICATIONS 1.1.1 External Appearance (Unit: mm) Figure 1.1-1 External Appearance [ 1 ] Dimensions (W x D x H) 221 x 253 x 87 mm [ 2 ] Weight Machine proper Approx. 1.2 kg Approx. 1.4 kg (including batteries and a tape cassette) In package Approx.

  • Page 8: Display

    Configuration (See Figure 1.1-2.) 112 dots wide by 32 dots high [ 3 ] Number of indicators (See Figure 1.1-2.) PT-550 USA version: European versions: PT-530 USA version: [ 4 ] Display system WYSIWYG (What you see is what you get) 1.1.4...

  • Page 9: Tape Cassette

    1.1.5 Tape Cassette [ 1 ] Cassette Cartridge type [ 2 ] Types of tape cassettes • Laminated tape cassette Laminate tape, ink ribbon, and adhesive base tape • Non-laminated tape cassette Non-laminated tape and ink ribbon • Non-laminated tape cassette, - Non-laminated tape refill refill-type (YS-18) - Ink ribbon refill...

  • Page 10: Tape Cutter

    1.1.6 Tape Cutter [ 1 ] Tape cutting Automatic cutter [ 2 ] Cutter unit Not user-replaceable 1.1.7 Lettering Stick Mounted on the bottom of the machine 1.1.8 PC Interface (not provided on the PT-550/530 USA versions.) [ 1 ] Interface cable Serial interface (RS-232C) cable for IBM AT/AT or clones...
  • Page 11 n PT-550 Figure 1.1-2 Key Arrangement (1) I - 5...
  • Page 12 Germany France Figure 1.1-2 Key Arrangement (2) I - 6...
  • Page 13 Belgium n PT-530 Figure 1.1-2 Key Arrangement (3) I - 7...

  • Page 14: Electronics Specifications

    PT-550 European versions : 452 (including symbols) [ 2 ] Internal fonts PT-550 USA version European versions : 8 PT-530 USA version 1.2.2 Power Supply [ 1 ] Power supply Driven by 8 batteries Optional AC line adapter (9.5 VDC, 1.3A) available...
  • Page 15 Chapter II. MECHANISMS...
  • Page 16 CONTENTS THEORY OF OPERATION .................. II-1 2.1.1 Print Mechanism ................... II-1 2.1.2 Roller Holder ASSY Setting & Retracting Mechanism ........II-3 2.1.3 Regular Tape & Ribbon Feed Mechanism ............. II-4 2.1.4 Color Printing Mechanism (provided on the PT-550 European versions only) ......... II-6 2.1.5 Tape Cutter Mechanism ................

  • Page 17: Theory Of Operation

    2.1 THEORY OF OPERATION 2.1.1 Print Mechanism n Structure of Thermal Head The machine uses thermal transfer printing. The thermal print head has a heat generator consisting of 128 heating elements which are vertically aligned as shown in Figure 2.1-1. Each heating element is 0.195 mm wide by 0.141 mm high.
  • Page 18 For laminated tape cassettes, instant lettering tape cassettes, and iron-on transfer tape cassettes, the CPU processes the print data to generate a mirror image so that the printed character can be seen normally when viewed from the other side of the printed face of the tape. n Character Formation While the main motor (stepping motor) feeds the tape and ink ribbon (tape only when using non- laminated thermal film tape cassettes or stamp tape cassettes) by 0.141 mm for 13.8 ms, the...

  • Page 19: Roller Holder Assy Setting & Retracting Mechanism

    2.1.2 Roller Holder ASSY Setting & Retracting Mechanism This mechanism consists of the roller release lever, roller release rod, and roller holder ASSY. The roller holder ASSY incorporates the platen holder and the sub roller holder. These holders support the platen and the tape feed sub roller so that they can move perpendicularly to the thermal head and the tape feed roller, respectively, as well as rotating freely.

  • Page 20: Regular Tape & Ribbon Feed Mechanism

    2.1.3 Regular Tape & Ribbon Feed Mechanism This mechanism consists of a main motor, gear train, and roller holder ASSY. n Regular Tape Feeding When you load a tape cassette and close the cassette cover, the platen and the thermal head sandwich the tape and ink ribbon (only the tape when using non-laminated thermal file tape cassettes or stamp tape cassettes) inbetween.
  • Page 21 n Adhesive Base Tape Feeding (only for laminated tape cassettes) A laminated tape cassette contains both a transparent laminate tape roll and a separate adhesive base tape roll. When a transparent laminate tape and an adhesive base tape pass through the contact point (between the tape feed roller and tape feed sub roller), they are then bonded together into a single, printed tape.

  • Page 22: Color Printing Mechanism (Provided On The Pt-550 European Versions Only

    2.1.4 Color Printing Mechanism (provided on the PT-550 European versions only) The color printing mechanism allows you to print on a tape with up to three colors. You need to use a refill-type non-laminated tape cassette (YS-18), change the color ribbon and press the New Block switch to rewind the tape for color printing.
  • Page 23 Tape rewinding process: After completion of the 1st printing sequence, you open the cassette cover, which retracts the roller holder ASSY from the thermal head providing you with enough space to access the ribbon (as described in Subsection 2.1.2). Then you take out the 1st color ribbon.

  • Page 24: Tape Cutter Mechanism

    2.1.5 Tape Cutter Mechanism The tape cutter unit consists of a stationary blade and a movable blade driven by the cutter motor. Upon completion of printing and tape feeding, the CPU activates the cutter motor (DC motor) whose clockwise rotation is transmitted via the idle gears to the cutter rocking gear. As the cutter rocking gear rotates counterclockwise, its boss "X"...

  • Page 25: Cover Open Switch

    2.1.6 Cover Open Switch Sliding the cover open switch to the left turns the cover lock lever as illustrated below, releasing the cassette cover. Figure 2.1-8 Cover Open Switch 2.1.7 Cassette Cover Sensor The cassette cover sensor (photosensor PH1) is provided on the main PCB. Closing the cassette cover puts its sensor tab in the photosensor, signaling that the cassette cover is closed.

  • Page 26: Disassembly & Reassembly

    2.2 DISASSEMBLY & REASSEMBLY n Safety Precautions (1) The disassembly or reassembly work should be carried out on a grounded antistatic sheet. Otherwise, the LSIs and electronic parts may be damaged due to the electricity charged in your body. (2) When transporting PCBs, be sure to wrap them in conductive sheets such as aluminum foil. (3) When using soldering irons and other heat-generating tools, take care not to damage the resin parts such as wires, PCBs, and covers.

  • Page 27: Disassembly Procedure

    2.2.1 Disassembly Procedure [ 1 ] Removing the Tape Cassette and Cassette Cover (1) Slide the cover open switch to the left and open the cassette cover fully. (2) Pull the tape cassette up and out of the machine. Figure 2.2-1 Removing the Tape Cassette II - 11...

  • Page 28: 2 ] Removing The Lettering Stick

    (3) Push the hinges of the cassette cover outwards and take off the cassette cover. Figure 2.2-2 Removing the Cassette Cover [ 2 ] Removing the Lettering Stick (1) Turn the machine upside down. (2) Pull out the lettering stick. Figure 2.2-3 Removing the Lettering Stick II - 12...

  • Page 29: 3 ] Removing The Battery Lid And Batteries

    [ 3 ] Removing the Battery Lid and Batteries (1) Press section "A" of the battery lid and remove it. (2) Take out batteries. Figure 2.2-4 Removing the Battery Lid and Batteries II - 13...

  • Page 30: 4 ] Removing The Bottom Cover

    [ 4 ] Removing the Bottom Cover (1) Turn the machine upside down. (2) Remove four screws from the bottom cover. (3) Apply your fingers to the rear end of the body cover and pull up the body cover. Figure 2.2-5 Removing the Body Cover (1) II - 14...
  • Page 31 (4) Open the body cover to the right as shown below. (5) Disconnect the power supply harness and the PC interface harness (provided on the PT-550 European versions only) from the main PCB. Figure 2.2-6 Removing the Body Cover (2) NOTE: Check that the base feet (see Figure 2.2-5) are tightly attached to the bottom cover without gap, peeling-off, or overreaching.

  • Page 32: 5 ] Removing The Blind Cover, Power Supply Pcb, And Terminal Plates

    [ 5 ] Removing the Blind Cover, Power Supply PCB, and Terminal Plates (1) Remove the blind cover from the bottom cover by pulling the three pawls outwards with a pointed tool. (2) Pull out the positive (+) and negative (−) terminals of the battery power cords. •...

  • Page 33: 6 ] Removing The Chassis Assy

    [ 6 ] Removing the Chassis ASSY During the following job, handle the connectors and harnesses gently not to damage them. (1) Disconnect the main motor harness and cutter motor harness from the main PCB. (2) Disconnect the thermal head cable. •...
  • Page 34 n n Disassembling the Chassis ASSY Removing the cutter unit and its related parts 1) Remove the cutter sensor actuator and spring from the chassis. 2) Remove two screws from the cutter unit and take it off. 3) Remove the cutter rocking gear and cutter double gears. Figure 2.2-10 Removing the Cutter Unit and its Related Parts Removing the cutter motor 1) Remove two screws from the cutter motor and take it off.
  • Page 35 Removing the roller holder ASSY, thermal head ASSY, and roller release lever 1) Remove the retaining ring from the roller holder ASSY. 2) Unhook the release spring from the roller holder ASSY and take out the ASSY. • When unhooking the release spring, take care not to scratch the thermal print head and its cable.

  • Page 36: 7 ] Removing The Cassette Sensor Pcb

    Removing the main motor ASSY Remove two screws from the motor bracket and take out the main motor ASSY. Figure 2.2-13 Removing the Main Motor ASSY [ 7 ] Removing the Cassette Sensor PCB (1) Disconnect the cassette sensor cable from the main PCB. •...

  • Page 37: 8 ] Removing The Main Pcb And Leading-Edge Sensor Pcb

    [ 8 ] Removing the Main PCB and Leading-edge Sensor PCB (1) Remove three screws from the main PCB. (2) Disconnect the leading-edge sensor harness. (3) Disconnect the FPC cable of the LCD module. • Before pulling the cable, be sure to unlock the connector on the main PCB. (4) Lift up the main PCB.

  • Page 38: 9 ] Removing The Rubber Keypad And Lcd Module

    [ 9 ] Removing the Rubber Keypad and LCD Module (1) Take out the rubber keypad from the body cover. (2) Remove two screws from the LCD support and take it off. (3) Remove the LCD module from its support by pulling one of two pawls with your fingers. Figure 2.2-16 Removing the Rubber Keypad and LCD Module II - 22...

  • Page 39: 10 ] Removing The Cover Open Switch

    [ 10 ] Removing the Cover Open Switch (1) Remove the cover lock lever together with the spring from the body cover. (2) Remove the spring from the cover lock lever. (3) Press the locking pawls of the cover open switch inwards and take it off. Figure 2.2-17 Removing the Cover Open Switch II - 23...

  • Page 40: Reassembly Procedure

    2.2.2 Reassembly Procedure [ 1 ] Installing the Cover Open Switch (1) Snap the cover open switch into place and check that it moves smoothly. (2) Fit the spring onto the cover lock lever and then set them to the body cover. Hook the shorter end of the spring on the boss of the body cover as illustrated below.

  • Page 41: 2 ] Installing The Lcd Module And Rubber Keypad

    [ 2 ] Installing the LCD Module and Rubber Keypad (1) Secure the LCD module in the LCD support by bending the pawls with your fingers. (2) Secure the LCD support to the body cover with two screws. Tightening torque: 29.4 N•cm (3 kgf•cm) (3) Place the rubber keypad on the body cover.

  • Page 42: 3 ] Installing The Leading-Edge Sensor Pcb And Main Pcb

    [ 3 ] Installing the Leading-edge Sensor PCB and Main PCB (1) Secure the leading-edge sensor PCB to the body cover with two screws . Tightening torque: 29.4 N•cm (3 kgf•cm) (2) Route the sensor harness as shown below. (3) Check that there is no foreign materials or dust on the contacts of the rubber keypad, then place the main PCB.

  • Page 43: 4 ] Installing The Cassette Sensor Pcb

    [ 4 ] Installing the Cassette Sensor PCB (1) Check that the switch actuators are not deformed. (2) Fit the switch actuators into the holes provided in the body cover and push down the cassette sensor PCB until the three latches catch the PCB. (3) Connect the cassette sensor cable to the main PCB and then lock the connector.

  • Page 44: 5 ] Installing The Chassis Assy

    [ 5 ] Installing the Chassis ASSY (1) If the chassis ASSY has been disassembled, assemble the components, referring to the following pages. (2) Put the chassis ASSY on the body cover, taking care not to sandwich the harnesses between the body cover and the chassis ASSY.
  • Page 45 n n Assembling the Components of the Chassis ASSY Installing the main motor ASSY 1) Put the main motor ASSY on the chassis and bring its edge into contact with the boss provided on the chassis. Then secure the ASSY with two screws, in the order of Tightening torque: 39.2 N•cm (4 kgf•cm) Figure 2.2-23 Installing the Main Motor ASSY II - 29...
  • Page 46 Installing the roller release lever, thermal head ASSY, and roller holder ASSY 1) Set the release rod roller in the roller release rod, and then install them to the thermal head ASSY. 2) Secure the roller release lever with the retaining ring. 3) Hook one end of the release lever spring on the roller release lever and the other end on the chassis.
  • Page 47 Installing the cutter motor 1) Secure the cutter motor to the chassis with two screws. Tightening torque: 39.2 N•cm (4 kgf•cm) Figure 2.2-25 Installing the Cutter Motor Installing the cutter unit and its related parts 1) Set the cutter sensor actuator and its spring on the chassis as illustrated below. 2) Install the cutter double gears and cutter rocking gear.

  • Page 48: 6 ] Installing The Terminal Plates, Power Supply Pcb, And Blind Cover

    [ 6 ] Installing the Terminal Plates, Power Supply PCB, and Blind Cover (1) Place the bottom cover upside down and push terminals plates "b" into the bottom cover. (2) Turn the bottom cover rightside up and push in terminal plate "a." (3) Secure the power supply PCB with two screws together with the grounding plate.

  • Page 49: 7 ] Installing The Bottom Cover

    [ 7 ] Installing the Bottom Cover (1) Hold the body cover as shown below, then connect the power supply harness and the PC interface harness (provided on the PT-550 European versions only) to the main PCB. Figure 2.2-28 Installing the Body Cover (1) (2) Align the front end of the body cover with that of the bottom cover, then fit those covers together.

  • Page 50: 8 ] Installing The Batteries And Battery Lid

    [ 8 ] Installing the Batteries and Battery Lid (1) Load batteries. (2) Fit the rear end of the battery lid into the bottom cover and push it down. Figure 2.2-30 Installing the Batteries and Battery Lid II - 34...

  • Page 51: 9 ] Installing The Lettering Stick

    [ 9 ] Installing the Lettering Stick (1) Snap the lettering stick into place. Figure 2.2-31 Installing the Lettering Stick II - 35...

  • Page 52: 10 ] Installing The Cassette Cover And Tape Cassette

    [ 10 ] Installing the Cassette Cover and Tape Cassette (1) Push the hinges of cassette cover outwards and fit them in the body cover. Figure 2.2-32 Installing the Cassette Cover (2) Load a tape cassette and close the cassette cover. Figure 2.2-33 Installing a Tape Cassette II - 36...

  • Page 53: 11 ] Demonstration Print And Final Check

    [ 11 ] Demonstration Print and Final Check (1) Power on the machine. (Do not connect the AC adapter.) (2) While holding down the Code key, press the BS key to cancel data previously entered. (3) While holding down the Code key, press the D key to start the demonstration print. (4) During the demonstration print, check that the machine prints data and then feeds and cuts the tape correctly.
  • Page 54 Chapter III. ELECTRONICS...
  • Page 55 CONTENTS OUTLINE OF CONTROL ELECTRONICS ............III-1 MAIN PCB ......................III-3 3.2.1 Block Diagram ....................III-3 3.2.2 CPU ......................III-5 3.2.3 ROM ......................III-6 3.2.4 RAMs ......................III-6 3.2.5 Key Contacts Matrix ..................III-7 [ 1 ] Key contacts matrix ..................III-7 [ 2 ] Solder points ....................

  • Page 56: Outline Of Control Electronics

    LCD module The LCD is 112 dots wide by 32 dots high, and it has also 24, 23, or 20 guidance indicators on the PT-550 European, PT-550 USA, or PT-530 USA version, respectively. III - 1...
  • Page 57 Figure 3.1-1 Control Electronics of PT-550 III - 2...

  • Page 58: Main Pcb

    3.2 MAIN PCB 3.2.1 Block Diagram Figure 3.2-1 shows a block diagram of the main PCB. The main PCB consists of the following: (1) CPU (2) ROM (3) RAMs (SRAMs) (4) Key contacts matrix (5) Power ON/OFF circuit and automatic powering-off circuit (6) Motor driver circuit (7) Cassette sensor circuit (8) Cover sensor circuit...
  • Page 59 Figure 3.2-1 Block Diagram of Main PCB III - 4...
  • Page 60 3.2.2 The CPU (M30622) is a 16-bit CMOS microprocessor which integrates a 3-kilobyte RAM. The external data bus is 16 bits, through which the CPU controls the ROM and RAMs. The internal data bus is 16 bits. Figure 3.2-2 CPU, ROM, and SRAMs III - 5...

  • Page 61: Rom

    3.2.3 ROM (See Figure 3.2-2.) The ROM is a 16-megabit masked ROM which stores control programs and character patterns. 3.2.4 RAMs (See Figure 3.2-2.) This machine uses two 1-megabit SRAMs which are used as a print buffer, program work area, and text memory.

  • Page 62: Key Contacts Matrix

    3.2.5 Key Contacts Matrix [ 1 ] Key contacts matrix On the main PCB is a key contacts matrix that is a set of 62 carbon-printed key contact patterns except for the On/Off key. (Refer to Figure 3.2-5.) Each contact pattern has a pair of electric nodes.

  • Page 63: 2 ] Solder Points

    [ 2 ] Solder points Figure 3.2-5 shows a circuit diagram relating to the keypad and solder points. Solder points 1 through 4 customize the machine for the destination. Solder points A through D are reserved for the future use for the individual thermal head properties. The CPU reads the solder point status once in the powering-on sequence to recognize the customization.

  • Page 64: Power On/Off Circuit And Automatic Powering-Off Circuit

    3.2.6 Power ON/OFF Circuit and Automatic Powering-off Circuit [ 1 ] Power ON/OFF circuit Figure 3.2-6 shows a circuit diagram of the power On/Off key. The CPU processes the On/Off key state in a sequence quite different from other keys although the On/Off key is on the same keypad.
  • Page 65 Powering-on sequence (See Figure 3.2-7.) When the CPU is supplied with no power and is in the reset status, pressing the On/Off key turns on Q3 so as to feed 5V power to the CPU. Getting started, the CPU first processes the INT0 interrupt and reads the input from the On/Off key.

  • Page 66: 2 ] Automatic Powering-Off Circuit

    [ 2 ] Automatic powering-off circuit The power automatic powering-off circuit is shown in Figure 3.2-6. If you power off the machine with the power On/Off key or you make no key entry for approx. 5 minutes (for approx. 30 minutes when the machine uses the RS-232C interface), the CPU turns the POW signal Low to shut down the Vcc (which would normally feed power to the logic circuits except the CPU).

  • Page 67: Motor Driver Circuit

    3.2.7 Motor Driver Circuit [ 1 ] Stepping motor driver circuit Figure 3.2-9 shows a driver circuit of the stepping motor which feeds tapes and ink ribbon. This circuit drives the motor with a bipolar 2-2 phase excitation. The motor is a 30-mm in diameter and has 24 poles with the exciting coils whose internal resistance is 108Ω...

  • Page 68: 2 ] Dc Motor Driver Circuit

    [ 2 ] DC motor driver circuit Figure 3.2-10 shows a driver circuit of the DC motor which cuts tape after a sequence of printing. Through its P72 (pin 28) and P73 (pin 27), the CPU activates the transistor array (TA7291F, #2) which drives the DC motor.

  • Page 69: Cassette Sensor Circuit

    3.2.8 Cassette Sensor Circuit Figure 3.2-11 shows the cassette sensor circuit which reads the five sensor switches. Loading a tape cassette turns on some of those five switches while keeping other switches off depending upon the ID holes provided in the tape cassette. If a certain ID hole is closed, the corresponding sensor switch goes on.
  • Page 70 Table 3.2-1 Coded Values for Identifying Tape Cassettes 1: Switch ON (ID hole closed) 0: Switch OFF (ID hole opened) Width Cassette type SW1 SW2 SW3 SW4 SW5 —— No tape cassette loaded 6 mm Laminated tape cassette Non-laminated tape cassette 9 mm Laminated tape cassette Non-laminated tape cassette...

  • Page 71: Cover Sensor Circuit

    3.2.9 Cover Sensor Circuit Figure 3.2-12 shows the cover sensor circuit. The cover sensor is a transparent photosensor. The CPU turns its P76 (KO6) High to gate the cover sensor signal on its P67 (COSENS). If the sensor signal is Low, the CPU interprets the cassette cover as being opened; if High, the CPU interprets it as being closed.

  • Page 72: Leading-Edge Sensor Circuit (Pt-550 European Versions Only)

    3.2.10 Leading-edge Sensor Circuit (PT-550 European versions only) Figure 3.2-13 shows a circuit diagram of the tape leading-edge sensor which detects the leading edge of the tape in color printing. The CPU checks whether the tape is present or not at the tape leading-edge sensor at three stages per issue of a motor drive pulse.

  • Page 73: Thermal Print Head Control Circuit

    3.2.11 Thermal Print Head Control Circuit Figure 3.2-14 shows the thermal print head control circuit. The print head integrates a heat generator (consisting of 128 heating elements vertically aligned in 180 dpi) and a pair of built-in driver ICs which are designed for 64-element control and cascaded with each other. Synchronizing with the 2 MHz clock on pin 37 (P61, CLK0), the CPU outputs serial print data containing 128-dot frame (8 x 16 bit map) through pin 35 (P63, TXD0) to the drivers, printing 96- dot data in practice.

  • Page 74: Cutter Sensor Circuit

    3.2.12 Cutter Sensor Circuit Figure 3.2-15 shows the cutter sensor circuit. When the cutter is opened, the movable blade activates the cutter sensor actuator which presses the cutter sensor switch to close the switch contact. If the DC motor is driven, the linked movable blade moves to cut tape, releasing the cutter sensor to open the switch contact.

  • Page 75: Voltage Detector Circuit And Temperature Sensor Circuit

    3.2.13 Voltage Detector Circuit and Temperature Sensor Circuit Figure 3.2-16 shows the voltage detector circuit and the ambient temperature sensor circuit, each of which is composed of a resistor network. [ 1 ] Voltage detector circuit This circuit, which is composed of divider resistors R29 and R11, steps down the power source VAD fed from batteries or the AC adapter output and then feeds the output to the analog input port AN0 of the CPU.
  • Page 76 Figure 3.2-16 Voltage Detector Circuit and Temperature Sensor Circuit III - 21...

  • Page 77: Oscillator Circuit

    3.2.14 Oscillator Circuit Figure 3.2-17 shows the oscillator circuit. It generates 12 MHz source which acts as a CPU basic clock. The CPU divides this into half (6 MHz) to synchronize its internal operations. Figure 3.2-17 Oscillator Circuit 3.2.15 Reset Circuit Figure 3.2-18 shows the reset circuit.
  • Page 78 Figure 3.2-19 shows the reset timing when the power is first applied or cut off or when the battery output drops below the specified level. When the machine is loaded with batteries or its AC adapter is plugged in, pressing the On/Off key raises the +5 source Vcc which feeds power to the logic circuitry.

  • Page 79: Lcd Module

    3.3 LCD MODULE Figure 3.3-1 shows the LCD module (COG-034) and its connector. In the LCD module is a driver chip which integrates a screen-data RAM designed for a dot-matrix LCD capable of displaying characters and graphics. According to control signals CSX, R/WX, and A0, the driver chip temporarily stores bit-mapped screen data sent from the CPU into the integrated RAM via 8-bit data bus KO0-KO7, and then it edits LCD drive signals.

  • Page 80: Power Supply Pcb

    3.4 POWER SUPPLY PCB 3.4.1 +12V Power Supply Circuit Figure 3.4-1 shows the +12V power supply circuit. Acting as a DC stepping-up converter, this circuit steps up the VAD (fed by batteries or AD adapter output) to +12 VDC power supplies, VH and VM.

  • Page 81: Ac Jack-Related Circuit

    3.4.3 AC Jack-related Circuit Figure 3.4-3 shows the circuit around the AC jack. Connecting the AC adapter to the AC jack J1 cuts off the power fed from the batteries and feeds power from the AC adapter. Diode D1 protects the machine when a wrong-polarity AC adapter is connected. For the right polarity of the AC adapter plug, refer to Figure 3.4-4.

  • Page 82: Interface (Rs-232C) Circuit (Pt-550 European Versions Only)

    3.4.4 Interface (RS-232C) Circuit (PT-550 European versions only) Figure 3.4-5 shows a circuit diagram of the interface port (RS-232C). This interface port serially receives print data from the PC. The driver ADM202 (#1) converts the RS-232C signal level to the TTL logic level. The baud rate is fixed to 9600 bps.
  • Page 83 Chapter IV. TROUBLESHOOTING...
  • Page 84 CONTENTS TROUBLESHOOTING ..................IV-1 4.1.1 Precautions ....................IV-1 4.1.2 After Repairing ....................IV-1 4.1.3 Troubleshooting Flows ................... IV-2 [ 1 ] Tape feeding failure ..................IV-2 [ 2 ] Printing failure .................... IV-5 [ 3 ] Powering failure (Nothing appears on the LCD.) ......... IV-8 [ 4 ] No key entry possible .................

  • Page 85: Troubleshooting

    4.1 TROUBLESHOOTING This section gives the service personnel some of the troubleshooting procedures to be followed if an error or malfunction occurs with this machine. It is impossible to anticipate all of the possible troubles which may occur in future and determine the troubleshooting procedures, so this chapter covers some sample troubles.

  • Page 86: Troubleshooting Flows

    4.1.3 Troubleshooting Flows [ 1 ] Tape feeding failure IV - 2...
  • Page 87 IV - 3...
  • Page 88 IV - 4...

  • Page 89: 2 ] Printing Failure

    [ 2 ] Printing failure IV - 5...
  • Page 90 IV - 6...
  • Page 91 IV - 7...

  • Page 92: 3 ] Powering Failure (Nothing Appears On The Lcd

    [ 3 ] Powering failure (Nothing appears on the LCD.) IV - 8...
  • Page 93 IV - 9...
  • Page 94 IV - 10...

  • Page 95: 4 ] No Key Entry Possible

    [ 4 ] No key entry possible IV - 11...

  • Page 96: 5 ] Abnormal Lcd Indication

    [ 5 ] Abnormal LCD indication IV - 12...

  • Page 97: 6 ] Tape Cassette Type Not Identified

    [ 6 ] Tape cassette type not identified IV - 13...

  • Page 98: 7 ] No Color Printing (This Applies To The Pt-550 European Versions Only

    [ 7 ] No color printing (this applies to the PT-550 European versions only) IV - 14...

  • Page 99: 8 ] Interface Port Failure (This Applies To The Pt-550 European Versions Only

    [ 8 ] Interface port failure (this applies to the PT-550 European versions only) IV - 15...
  • Page 100 APPENDICES Circuit Diagrams A. Main PCB B. Power Supply PCB...
  • Page 102 B. Power Supply PCB...

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