Brother PT-2420PC Service Manual
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Brother PT-2420PC Service Manual

Brother PT-2420PC Service Manual

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SERVICE MANUAL
MODEL: PT-2420PC

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Summary of Contents for Brother PT-2420PC

  • Page 1 SERVICE MANUAL MODEL: PT-2420PC...
  • Page 2 PREFACE This publication is a service manual covering the specifications, general mechanism, disassembly/reassembly procedure, and troubleshooting of the Brother PT-2420PC. It is intended for service personnel and other concerned persons to accurately and quickly provide after-sale service for our PT-2420PC.

  • Page 3: Table Of Contents

    CONTENTS CHAPTER I SPECIFICATIONS................. I-1 MECHANICAL SPECIFICATIONS ................ I-1 1.1.1 External View ....................I-1 1.1.2 Control Button and LED.................. I-2 1.1.3 Printing Mechanism..................I-2 1.1.4 Tape Cassette ....................I-3 1.1.5 Tape Cutter ....................I-3 1.1.6 PC Interface ....................I-3 ELECTRICAL SPECIFICATIONS................I-4 1.2.1 Power Supply ....................
  • Page 4 [ 6 ] Removing the DC Motor ASSY and Cutter ASSY ........... III-7 [ 7 ] Removing the Roller Holder ASSY and Termal Head ASSY......III-8 [ 8 ] Removing the Gears ..................III-9 [ 9 ] Removing the Switch ASSY ................III-10 REASSEMBLY PROCEDURE................

  • Page 5: Chapter Ispecifications

    CHAPTER I SPECIFICATIONS MECHANICAL SPECIFICATIONS 1.1.1 External View Dimensions (W x D x H) 66 x 145 x 123 mm Weight Machine proper Approx. 0.4 kg In package Approx. 1.5 kg Fig. 1.1-1 External View...

  • Page 6: Control Button And Led

    1.1.2 Control Button and LED Number of buttons 1 (ON/OFF ( ) and FEED) Green Layout See Fig. 1.1-2. Cutter lever LED (Cover) ON/OFF and FEED button Fig. 1.1-2 Layout 1.1.3 Printing Mechanism Printing method Thermal transfer onto plastic tapes (laminate tape and non-laminate tape) or special tapes (instant lettering tape, non-laminate thermal film tape, and iron-on transfer tape) (Fixed thermal print head and tape feed mechanism)

  • Page 7: Tape Cassette

    1.1.4 Tape Cassette Cassette Cartridge type (TZ cassette) (AL cassette) Types of tape cassettes • Laminated tape cassette Laminate tape, ink ribbon, and adhesive base tape • Non-laminated tape cassette Non-laminate tape and ink ribbon • Instant lettering tape cassette Instant lettering tape and ink ribbon •...

  • Page 8: Electrical Specifications

    ELECTRICAL SPECIFICATIONS 1.2.1 Power Supply Power supply Dedicated AC adapter ( 9.5 VDC, 1.3A) provided as attachment...

  • Page 9: Chapter Ii General Mechanism

    CHAPTER II GENERAL MECHANISM MAIN MECHANISM 2.1.1 Print Mechanism Structure of Thermal Head This 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 Fig. 2.1-1. Out of those 128 heating elements.
  • Page 10 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.

  • Page 11: 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 supports the platen and tape feed sub roller so that they can move perpendicularly to the thermal head and tape feed roller built in the tape cassette, respectively, as well as rotating freely.

  • Page 12: Roller Holder Assy & Cassette Cover Interlocking Mechanism

    2.1.3 Roller Holder ASSY & Cassette Cover Interlocking Mechanism Closing the cassette cover pushes down the roller release lever and brings the top of the lever into the box provided on the inside of the cassette cover. As described in Subsection 2.1.2 “Roller Holder ASSY Setting & Retracting Mechanism”, the roller release lever shifts the roller release rod so that the roller holder ASSY is pressed towards the thermal head side.

  • Page 13: Tape & Ribbon Feed Mechanism

    2.1.4 Tape & Ribbon Feed Mechanism This mechanism consists of a DC motor, gear train, and roller holder ASSY. 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) inbetween.
  • Page 14 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 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 15: Tape Cutter Mechanism

    2.1.5 Tape Cutter Mechanism The tape cutter ASSY consists of a stationary blade and movable blade. The printed tape will come through those blades. Pressing the cutter lever will drive the cutter drive gear whose pin will move the movable blade, cutting the printed tape, just like a scissors. Tape cassette Stationary blade Cutter lever...

  • Page 16: Outline Of Electronic Control

    OUTLINE OF ELECTRONIC CONTROL 2.2.1 Configuration Fig. 2.1-1 shows a block diagram of the control electronics of this machine. The control electronics consists of a main PCB, DC motor, and thermal print head ASSY. Fig. 2.2-1 Control Electronics of PT-2420PC Main PCB This manages all the components including an LED, ON/OFF switch, DC motor, thermal print head ASSY, and USB interface.

  • Page 17: Main Pcb

    2.2.2 Main PCB Fig. 2.2-2 shows a block diagram of the main PCB. The main PCB consists of the following: CPU (including a ROM and RAM) SRAM (256-kilobyte) EEPROM (1-kilobit) USB interface circuit LED ON/OFF circuit, thermal head control circuit, and motor driver circuit Reset circuit Oscillator circuit Cassette sensor circuit and cutter sensor circuit...
  • Page 18 CHAPTER III DISASSEMBLY & REASSEMBLY PROCEDURE Safety Precautions grounded You should carry out disassembly & reassembly jobs on an anti-static sheet correctly. Otherwise, the LSI and other electronic devices will be damaged due to the electricity charged in your body. When transporting PCBs, be sure to wrap them in conductive sheets such as aluminum foil.

  • Page 19: Disassembly Procedure

    DISASSEMBLY PROCEDURE [ 1 ] Removing the Tape Cassette Open the cassette cover while holding down the section “A” of the cassette cover. Take the tape cassette out of the machine by holding both sides of the cassette. Note: When opening the cassette cover, the platen is released from the thermal head so that there is a gap between them to make possible to replace the tape cassette.
  • Page 20 Remove the five screws securing the bottom cover. Screws Screws Fig. 3.1-3 Removing the Bottom Cover (1) Turn the machine upside down so that the bottom cover is at the top. Remove the bottom cover. Bottom cover Fig. 3.1-4 Removing the Bottom Cover (2) III-3...

  • Page 21: 3 ] Removing The Main Pcb Assy

    [ 3 ] Removing the Main PCB ASSY Remove the one screw securing the main PCB ASSY. Disconnect the thermal head flat cable from the main PCB ASSY. Screw Main PCB ASSY Thermal head flat cable Middle cover Fig. 3.1-5 Removing the Main PCB ASSY (1) Remove the eleven harnesses (six for the cassette sensor, three for the sub PCB ASSY, two for the DC motor) soldered onto the main PCB ASSY.

  • Page 22: 4 ] Removing The Top Cover, Sub Pcb Assy, Power Supply Actuator And Led Cover

    [ 4 ] Removing the Top Cover, Sub PCB ASSY, Power Supply Actuator and LED Cover Press the cutter lever in the direction of the arrow “A” to remove the top cover. CAUTION: When removing the top cover, ensure not to pull the three harnesses for the sub PCB ASSY.

  • Page 23: Removing The Chassis Assy

    [ 5 ] Removing the Chassis ASSY Remove the two screws securing the chassis ASSY. Release the roller release lever as shown in the figure below. Pull the chassis ASSY out of the middle cover. Warning: When removing the chassis ASSY, take care not to get injured in your fingers with the cutter blade.

  • Page 24: 6 ] Removing The Dc Motor Assy And Cutter Assy

    [ 6 ] Removing the DC Motor ASSY and Cutter ASSY Remove the washer 2.6 and double gear 3 from the chassis sub ASSY. Remove the two screws to remove the DC motor ASSY from the chassis sub ASSY. Remove the one retaining ring to remove the cutter lever and cutter return spring from the chassis sub ASSY.

  • Page 25: 7 ] Removing The Roller Holder Assy And Termal Head Assy

    [ 7 ] Removing the Roller Holder ASSY and Termal Head ASSY Caution: When handling the thermal head ASSY, ensure not to touch the thermal head with your hand. If touching the thermal head before discharge static electricity charged in your body, the thermal head may be damaged. Make sure that the roller holder ASSY is released from the thermal head.

  • Page 26: 8 ] Removing The Gears

    Remove the tape fixing the thermal head flat cable. Remove the one screw to remove the thermal head ASSY from the chassis sub ASSY. Screw Thermal head ASSY Chassis sub ASSY Thermal head flat cable Tape Fig. 3.1-13 Removing the Thermal Head ASSY [ 8 ] Removing the Gears Remove the two washers 1.7 to remove the double gears 1 and 4 from each of their shafts.

  • Page 27: 9 ] Removing The Switch Assy

    [ 9 ] Removing the Switch ASSY Pull the three hooks on the middle cover outwards slightly to remove the switch ASSY. Caution: Make sure not to break the hooks on the middle cover. Switch ASSY Hooks Middle cover Fig. 3.1-15 Removing the Switch ASSY III-10...

  • Page 28: Reassembly Procedure

    REASSEMBLY PROCEDURE [ 1 ] Assembling the Switch ASSY Pull the three hooks on the middle cover outwards slightly to assemble the switch ASSY. Caution: Make sure not to break and deform the hooks. Switch ASSY Hooks Middle cover Fig. 3.1-16 Assembling the Switch ASSY III-11...

  • Page 29: 2 ] Assembling The Gears

    [ 2 ] Assembling the Gears Install the P idle gear, tape idle gear, idle gear and double gear 2 onto the chassis sub ASSY. Install the double gears 1 and 4 onto each of their shafts and assemble the two washers 1.7.

  • Page 30: 3 ] Assembling The Thermal Head Assy And Roller Holder Assy

    [ 3 ] Assembling the Thermal Head ASSY and Roller Holder ASSY Pass the thermal head flat cable through the oblong hole on the chassis sub ASSY. Align the thermal head ASSY with the positioning boss on the chassis sub ASSY and secure the thermal head ASSY with the one screw.
  • Page 31 Align the roller release lever with the hole on the chassis sub ASSY to insert the lever into the hole and turn the lever in the direction of the arrow to assemble it onto the chassis sub ASSY. Pull the roller release rod outwards in the direction of the arrow to insert it into the hole on the roller release lever.

  • Page 32: Assembling The Cutter Assy And Dc Motor Assy

    [ 4 ] Assembling the Cutter ASSY and DC Motor ASSY Apply half of a rice-grain size of the grease onto the slideway and gear on the cutter rack gear. Grease: Shinetsu Silicon silicon grease G501 Insert the cutter drive gear ASSY onto the shaft on the chassis sub ASSY and turn it in the direction of the arrow to assemble it.
  • Page 33 [Assembled position of the cutter drive gear ASSY and cutter rack gear] Cutter rack gear <Note> Assemble the cutter rack gear while turning the cutter drive gear ASSY in the direction of the arrow to attach it onto the chassis sub ASSY. Cutter drive gear ASSY Fig.

  • Page 34: Assembling The Chassis Assy

    [ 5 ] Assembling the Chassis ASSY Release the roller release lever to insert the chassis ASSY into the middle cover by aligning it with the slit, one boss and two ribs on the middle cover. Warning: Take care not to get injured in your fingers with the cutter blade. Note: When assembling the chassis ASSY onto the middle cover, make sure that there is no gap between them.

  • Page 35: Assembling The Led Cover, Power Supply Actuator, Sub Pcb Assy And Top Cover

    [ 6 ] Assembling the LED Cover, Power Supply Actuator, Sub PCB ASSY and Top Cover Assemble the LED cover and power supply actuator onto the top cover. Power supply actuator LED cover Top cover Fig. 3.1-26 Assembling the LED Cover and Power Supply Actuator Set the sub PCB ASSY onto the two positioning pins on the top cover and secure the one screw to assemble the sub PCB ASSY onto the top cover.
  • Page 36 Insert the cutter lever into the section “B” on the top cover. Align the concave on the top cover with the convex on the middle cover to assemble the top cover onto the middle cover. Note: Make sure not to catch the harness of the sub PCB ASSY between the covers. Chassis ASSY Convex Concave...

  • Page 37: 7 ] Assembling The Main Pcb

    [ 7 ] Assembling the Main PCB Make sure to fix the three harnesses of the sub PCB ASSY into the slits on the top cover. Fix the two harnesses of the DC motor ASSY into the slits on the top cover. Sub PCB ASSY harnesses DC motor harnesses Slits where the sub PCB harnesses is fixed...
  • Page 38 Solder the harnesses of the sub PCB ASSY onto the three soldered points on the main PCB ASSY. Middle cover Yellow Green Black Sub PCB ASSY harnesses Fig. 3.1-31 Assembling the Main PCB ASSY (3) Solder the harnesses of the DC motor ASSY onto the two soldered points on the main PCB ASSY.
  • Page 39 Bind the six harnesses of the switch ASSY at the center of the harness with the fixing tape. Note 1: Use the transparent tape whose width is 12mm to bind the harness. Note 2: When the harnesses have been already bound with the tape, check that they are bound correctly.
  • Page 40 Connect the thermal head flat cable to the connector on the main PCB ASSY. Align the holes on the main PCB ASSY with the one boss and one pin on the middle cover and secure the one screw to assemble the main PCB ASSY. Caution: When replacing the main PCB with a new one, always write the serial number into the new PCB following the flow described in Appendix 1.

  • Page 41: 8 ] Assembling The Bottom Cover, Cassette Cover And Tape Cassette

    [ 8 ] Assembling the Bottom Cover, Cassette Cover and Tape Cassette Align the seven ribs and two holes on the bottom cover with the middle cover and top cover to assemble the bottom cover. Ribs Hole Hole Bottom cover Ribs Ribs Top cover...
  • Page 42 Pull the two arms on the cassette cover outwards to assemble the cassette cover onto the middle cover. Cassette cover Middle cover Fig. 3.1-38 Assembling the Cassette Cover Open the cassette cover and install the tape cassette. Cassette cover Tape cassette Fig.

  • Page 43: Self Print Test

    [ 9 ] Self Print Test You may make a self print test according to the following procedure without using a PC. Caution: Even if no problem is found in this self print test, however, you need to connect the machine to a PC, enter texts from the PC, and output them to the machine.

  • Page 44: Chapter Iv Error Indication And Troubleshooting

    CHAPTER ERROR INDICATION AND TROUBLESHOOTING 4.1 OVERVIEW 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 45: If The Indicator Led On The Pt-2420Pc Lights Or Flashes

    4.3 IF THE INDICATOR LED ON THE PT-2420PC LIGHTS OR FLASHES Check the LED state that shows the current machine status as listed below. Indicator LED Machine status Remarks In the standby mode for data reception. Flashing slowly The machine has received data. Upon receipt of a print command, the machine will (In a cycle of 0.3-...

  • Page 46: If Any Error Message Is Displayed On The Computer Screen

    4.4 IF ANY ERROR MESSAGE IS DISPLAYED ON THE COMPUTER SCREEN Check the error message table given below and take any necessary action. If you press the Detail button when an error message is displayed, then the Monitor Help will start and show Advice.
  • Page 47 If this message appears on the computer Do this: screen: Communication error between PC and P- (1) Check that the P-touch is connected to your touch. computer with the USB interface cable (that comes with the P-touch). Also check the cable for weak connection.

  • Page 48: If Any Of The Following Problems Occurs

    4.5 IF ANY OF THE FOLLOWING PROBLEMS OCCURS - Tape feeding failure - Printing failure - The indicator LED will not come on - Interface malfunctions Follow the related troubleshooting flows given below. [ 1 ] Tape Feeding Failure IV - 5...

  • Page 49: 2 ] Printing Failure

    [ 2 ] Printing Failure IV - 6...

  • Page 50: 3 ] The Indicator Led Will Not Come On

    [ 3 ] The Indicator LED will not come on IV - 7...

  • Page 51: 4 ] Interface Malfunctions

    [ 4 ] Interface Malfunctions IV - 8...

  • Page 52: Appendix 1. Maintenance Software

    Appendix 1. MAINTENANCE SOFTWARE Appendix 1.1 OVERVIEW The maintenance software contains the test program (PT15TESTSE.EXE and patern01.prn) and EEPROM initialization program (PT15RESET.EXE). The test program may check the cassette sensor, tape feeding & cutting function, and printing function, as well as writing a serial number onto the EEPROM mounted on the main PCB in the PT-2420PC.

  • Page 53: Appendix 1.3 Running The Test Program

    Appendix 1.3 RUNNING THE TEST PROGRAM Turn on your computer. After the OS has started up, press the ON/OFF switch of the PT-2420PC to turn it on. Double-click the test program named PT15TESTSE.EXE to start it up. The following window will appear. Note: If the dialog "The Port Monitor not loaded!"...
  • Page 54 The display will change to the following: Note: If the Results area shows any message other than "The serial number was entered.", then click the Finish checking and exit button to abort the test program. Check the power supply and connection between your computer and PT-2420PC. Go to the recovery procedure given in Appendix 1.5.
  • Page 55 Check the cassette sensor according to the following instructions: Open the cassette cover, remove the tape cassette, and press five sensor switches one by one. Each time one of them is pressed, the related number of the Cassette sensor shown in the Results area will change to "+."...
  • Page 56 Note: If any error message appears in the Results area, click the Stop the feed cut test button and then click the Finish checking and exit button to abort the test program. Go to the recovery procedure given in Appendix 1.5. (10) Push down the cutter lever to cut the tape.
  • Page 57 (11) Repeat tape feeding and cutting three times. Then the feed cut test will automatically finish and the display will change to the following: (12) With the tape cassette being loaded, click the Printing test 1 button. The tape will feed and the display will change to the following: Note: If any error message appears in the Results area, click the Stop printing test 1 button and the Finish checking and exit button in this order to abort the test program.
  • Page 58 (13) Push down the cutter lever to cut the tape. The PT-2420PC will start printing. If printing finishes, the display will change as shown below. Note: If any error message appears in the Results area, click the Stop printing test 1 button and the Finish checking and exit button in this order to abort the test program.
  • Page 59 The serial number entered into the Serial No. area will be written into the PT-2420PC. The display will change to the following: Note: If any error message appears in the Results area, go to the recovery procedure given in Appendix 1.5. (16) Check that the serial number you entered is displayed in the Results area, then click the Finish checking and exit button.

  • Page 60: Appendix 1.4 Running The Eeprom Initialization Program

    Appendix 1.4 RUNNING THE EEPROM INITIALIZATION PROGRAM Turn on your computer. After the OS has started up, press the ON/OFF switch of the PT-2420PC to turn it on. Double-click the EEPROM initialization program named PT15RESET.EXE to start it up. The following window will appear. Note: If the dialog "The Port Monitor not loaded!"...

  • Page 61: Appendix 1.5 Recovering From Run-Time Errors

    Appendix 1.5 RECOVERING FROM RUN-TIME ERRORS Click the Finish checking and exit button to abort the running program. Check that the PT-2420PC is turned on. Check the USB interface cable connection at both the PT-2420PC and your computer. Start the program again. If no error occurs at the same testing process, proceed to the subsequent testing process.
  • Page 63 Jan., 2002 8V2029BE0 Printed in Japan...

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