Brother PT 1800 - P-Touch 1800 Thermal Transfer Printer Service Manual Download Page 44

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CONTENTS

CHAPTER

III

ELECTRONICS

3.1 OUTLINE OF CONTROL ELECTRONICS ..........................................................................

III

-1

3.2 MAIN PCB...........................................................................................................................

III

-2

3.2.1

Block Diagram ........................................................................................................

III

-2

3.2.2

CPU........................................................................................................................

III

-4

3.2.3

Key Contacts Matrix ...............................................................................................

III

-4

[ 1 ] Key contacts matrix ................................................................................................

III

-4

[ 2 ] Solder points ..........................................................................................................

III

-6

3.2.4

Power ON/OFF Circuit and Power Saving Circuit...................................................

III

-7

[ 1 ] Power ON/OFF circuit ............................................................................................

III

-7

[ 2 ] Power saving circuit................................................................................................

III

-8

3.2.5

Motor Driver Circuit.................................................................................................

III

-9

3.2.6

Thermal Head Drive Circuit ..................................................................................

III

-10

3.2.7

Voltage Detector Circuit and Temperature Sensor Circuit....................................

III

-11

[ 1 ] Voltage detector circuit.........................................................................................

III

-11

[ 2 ] Ambient temperature sensor circuit ......................................................................

III

-12

3.2.8

Cassette Sensor Circuit........................................................................................

III

-13

3.2.9

Cutter Sensor Circuit ............................................................................................

III

-14

3.2.10 Oscillation Circuit..................................................................................................

III

-15

3.2.11 Reset Circuit.........................................................................................................

III

-15

3.2.12 +5BV Power Source .............................................................................................

III

-16

3.3 POWER SUPPLY PCB .....................................................................................................

III

-17

Summary of Contents for PT 1800 - P-Touch 1800 Thermal Transfer Printer

Page 1: ...SERVICE MANUAL MODEL PT 1800 1810 ...

Page 2: ...SERVICE MANUAL MODEL PT 1800 1810 ...

Page 3: ...ht Brother 1999 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: ...persons to accurately and quickly provide after sale service for our PT 1800 1810 To perform appropriate maintenance so that the machine is always in best condition for the customer the service personnel must adequately understand and apply this manual This manual is made up of four chapters and appendices CHAPTER I SPECIFICATIONS CHAPTER II MECHANISMS CHAPTER III ELECTRONICS CHAPTER IV TROUBLESHO...

Page 5: ...CHAPTER I SPECIFICATIONS ...

Page 6: ...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 3 1 2 ELECTRONICS SPECIFICATIONS I 7 1 2 1 Character Generator I 7 1 2 2 Power Supply I 7 1 3 KEY COMMANDS FOR SPECIAL FUNCTIONS I 8 1 3 1 Initializing I 8 1 3 2 Demonstration Print I 8 ...

Page 7: ...x 205 x 60 mm 7 20 x 8 07 x 2 36 2 Weight Machine proper Approx 730 g In package Approx 1 4 kg including batteries a tape cassette and user s manual 1 1 2 Keyboard 1 Entry system Rubber key pad 2 Number of alphanumeric and symbol keys 39 3 Number of function keys 12 including ON OFF key 4 Key arrangement See Figure 1 1 2 ...

Page 8: ...lastic tapes laminate tape and non laminated tape or special tapes instant lettering tape non laminated thermal film tape iron on transfer tape and porous stamp tape Fixed print head and tape feeding mechanism 2 Print speed 10 mm second Typical 3 Print head Type Thermal print head Heat generator Consists of 128 heating elements vertically aligned 96 out of them actually used Size of heating elemen...

Page 9: ...ransfer tape and ink ribbon Stamp tape cassette Porous stamp tape and base paper 3 Tape size Width Length Laminate tape 6 9 12 18 mm 8 m 5 m for the fluorescent coating tape Non laminate tape 6 9 12 18 mm 8 m Instant lettering tape 18 mm 8 m Non laminated thermal film tape 12 18 mm 8 m Iron on transfer tape 18 mm 6 m Porous stamp tape 18 mm 3 m 4 Tape cassette packed with the machine Laminated tap...

Page 10: ...I 4 n U S A Canada n U K Figure 1 1 2 Key Arrangement 1 ...

Page 11: ...I 5 n Germany n France Figure 1 1 2 Key Arrangement 2 ...

Page 12: ...I 6 n Belgium Figure 1 1 2 Key Arrangement 3 ...

Page 13: ...input detection 1 Low voltage detection when dry batteries are loaded During printing If the voltage level at the CPU s A D terminals drops below 6 4 V or 6 0 V twice in succession the BATTERY WEAK or BATTERY EMPTY message appears on the LCD respectively If the voltage level at the CPU s A D terminals drops below 5 8 V twice in succession the CPU immediately shuts down the power During non printin...

Page 14: ...zing Powering on the machine with both the Code and R keys held down will initialize the machine 1 3 2 Demonstration Print Pressing the D key with the Code key held down will start demonstration print This key command takes effect only when no data is entered ...

Page 15: ...CHAPTER II MECHANISMS ...

Page 16: ... 11 5 Removing the Main PCB and Rubber Key Pad II 14 6 Removing the Cassette Sensor PCB II 15 7 Removing the Blind Cover II 15 8 Removing the Power Supply PCB II 16 9 Removing the Battery Terminals II 16 2 2 2 Reassembly Procedure II 17 1 Installing the Battery Terminals II 17 2 Installing the Power Supply PCB II 17 3 Installing the Blind Cover II 18 4 Installing the Cassette Sensor PCB II 18 5 In...

Page 17: ...lements Laminate tape when using laminated tape cassettes Non laminated tape when using non laminated tape cassettes Instant lettering tape when using instant lettering tape cassettes Non laminated thermal film tape when using non laminated thermal film tape cassettes Iron on transfer tape when using iron on transfer tape cassettes When using non laminated thermal film tape cassettes or stamp tape...

Page 18: ...sed against the ink pad it will absorb ink through the pores 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 drive motor DC motor feeds the tap...

Page 19: ...so as to press the roller holder ASSY against the thermal head The platen is pressed perpendicularly against the thermal head with the tape and ink ribbon only the tape when using non laminated thermal film tape cassettes or stamp tape cassettes sandwiched inbetween under a uniform load by the platen spring Also the sub roller holder is pressed so that the tape feed sub roller is pressed perpendic...

Page 20: ...adhesive base tape when using laminated tape cassettes inbetween as described in Subsection 2 1 2 As the drive motor rotates the rotation is transmitted via the gear train to the tape feed gear which rotates both the tape feed roller and the tape feed sub roller whose gear is engaged with the tape feed gear at the same rotation speed Accordingly the sandwiched tape will be advanced When a laminate...

Page 21: ... the drive motor rotates the ribbon drive cam located at the middle of the gear train rotates counterclockwise When fitted on the ribbon drive cam the ribbon take up roll in the tape cassette also rotates to take up the ink ribbon To apply proper tension to the ink ribbon between the platen and the ribbon drive cam the feed amount of the ribbon drive cam is slightly greater than that of the tape f...

Page 22: ...le blade so that the cutter cuts the printed tape routing through the movable and stationary blades just like a scissors Attached to the cutter lever the cutter sensor arm turns up so that its tip comes into contact with the switch of the cutter sensor circuit on the main PCB stopping printing and tape feeding Figure 2 1 5 Tape Cutter Mechanism ...

Page 23: ...ing Mechanism the roller release lever shifts the roller release rod so that the roller holder ASSY is pressed towards the thermal head side Figure 2 1 6 Roller Release Lever and Roller Release Rod Figure 2 1 7 Roller Holder ASSY Cassette Cover Interlocking Mechanism Opening the cassette cover pulls up the roller release lever placed in the hooked section of the cassette cover which shifts the rol...

Page 24: ...MBLY REASSEMBLY 2 2 1 Disassembly Procedure 1 Removing the Battery Lid and Batteries 1 Turn the machine upside down 2 Press section A of the battery lid to remove then take out batteries Figure 2 2 1 Removing Batteries ...

Page 25: ...II 9 2 Removing the Tape Cassette 1 Place the machine rightside up and open the cassette cover fully 2 Pull the tape cassette up and out of the machine Figure 2 2 2 Removing the Tape Cassette ...

Page 26: ...pull it up When you separate the bottom cover from the boy cover the cassette cover may also be removed Figure 2 2 3 Removing the Bottom Cover 1 5 Open the bottom cover to the left as shown below 6 Disconnect the power supply harness from the main PCB Figure 2 2 4 Removing the Bottom Cover 2 NOTE Check that the base plate feet are tightly attached to the bottom cover without any gaps peeling off o...

Page 27: ...e cable be sure to unlock the connector on the main PCB 3 Disconnect the drive motor harness from the main PCB 4 Disconnect the cassette sensor cable from the main PCB Before pulling the cable be sure to unlock the connector on the main PCB 5 Take off the cassette cover from the body cover The roller release lever will pop up when viewed from the bottom 6 Lift the chassis ASSY up and out of the bo...

Page 28: ...lever as shown below and pull up the roller holder ASSY together with the roll release lever and rod making sure that the roller holder spring does not go flying off 3 Remove the screw from the thermal head ASSY then take off the ASSY Removing the drive motor ASSY 1 Remove two screws from the chassis then take off the drive motor ASSY Figure 2 2 6 Disassembling the Chassis ASSY ...

Page 29: ...wo screws from the cutter ASSY then take off the ASSY CAUTION To remove the right hand screw push down the left end of the movable blade to turn it counterclockwise taking care not to push it down excessively or let the left end of the cutter spring touch the cutting edge of stationary blade Figure 2 2 7 Removing the Cutter ASSY ...

Page 30: ...d If you have built up a static charge touching the PCB without any anti static control may damage the LSI and other electronic devices 1 Remove the main PCB by releasing it from two latches provided on the body cover Figure 2 2 8 Removing the Main PCB 2 Lift up the rubber key pad Figure 2 2 9 Removing the Rubber Key Pad ...

Page 31: ... sensor PCB from the body cover by pulling the three pawls outwards Figure 2 2 10 Removing the Cassette Sensor PCB 7 Removing the Blind Cover Remove the blind cover from the bottom cover by pulling the three pawls outwards Figure 2 2 11 Removing the Blind Cover ...

Page 32: ...ower supply PCB 3 Pull the hooks provided on the bottom cover outwards and take out the power supply PCB together with the grounding plate Figure 2 2 12 Removing the Power Supply PCB 9 Removing the Battery Terminals 1 Remove the battery terminal as shown below left 2 As shown below right turn the bottom cover upside down and remove the other battery terminal while slightly bending section A Figure...

Page 33: ...rminals 2 Installing the Power Supply PCB 1 Fit the positive and negative terminals of the battery power cords into the bottom cover When handling those terminals do not grip the cords but the terminal plates 2 Snap the power supply PCB into the hooks provided on the bottom cover 3 Insert the grounding plate between the power supply PCB and the boss provided on the bottom cover then secure with a ...

Page 34: ...ver 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 Figure 2 2 17 Installing the Cassette Sensor PCB 3 Press and release each of those switch actuators with your finger to check that they pop up normally Figure 2 2 ...

Page 35: ...d so that it is fitted over the bosses provided on the body cover Figure 2 2 19 Installing the Rubber Key Pad 6 Installing the Main PCB Check that there is no foreign material or dust on the key contacts on the main PCB then install the PCB Refer to Figure 2 2 19 ...

Page 36: ...ler release lever to the horizontal position 4 Connect the cassette sensor cable to the main PCB Be sure to lock the connector on the main PCB 5 Connect the drive motor harness to the main PCB then route it through X so that the harness will not become slack between its connector housing and X 6 Secure the anti static lead wire to the chassis with a screw Tightening torque 490 196 mN m 5 2 kgf cm ...

Page 37: ...wo screws Tightening torque 490 196 mN m 5 2 kgf cm 2 Hook the cutter spring as shown below 3 Make sure that the cutter ASSY is fitted on the side of the chassis without any gap Figure 2 2 21 Installing the Cutter ASSY Installing the drive motor ASSY 1 Install the drive motor ASSY to the chassis with two screws taking care not to damage the gear Tightening torque 392 196 mN m 4 2 kgf cm ...

Page 38: ... cm 2 First fit the roller holder spring and the assembly of the roller release lever and rod onto the roller holder ASSY as shown below Then install them to the chassis and set the retaining ring For easier installation assemble the roller release lever and rod in an angle shown below Figure 2 2 22 Assembling the Components of the Chassis ASSY ...

Page 39: ...in PCB 2 Align the front edge of the bottom cover with that of the body cover then push down the bottom cover until it snaps into place Take care not to pinch the cords between those covers Figure 2 2 23 Installing the Bottom Cover 1 3 Secure the bottom cover with seven screws Tightening torque 392 196 mN m 4 2 kgf cm Figure 2 2 24 Installing the Bottom Cover 2 ...

Page 40: ...up 2 Lift up the roller release lever 3 Hold the cassette cover at an angle shown below and slide down its hinges until they become fitted into the bottoms of the grooves provided in the bottom cover 4 Close the cassette cover Figure 2 2 25 Installing the Cassette Cover ...

Page 41: ...e thermal print head 2 Load a tape cassette 3 Close the cassette cover The roller holder ASSY will be pressed against the thermal head Figure 2 2 26 Installing the Tape Cassette and Cutter Unit 11 Loading Batteries and Installing the Battery Lid 1 Load batteries 2 Fit the front end of the battery lid into the bottom cover and push down the lid ...

Page 42: ... print 4 During the demonstration print check that the machine feeds the tape and prints data correctly Then cut the tape If any problem is found go to the troubleshooting in Chapter IV 5 Open the cassette cover to check that it retracts the roller holder ASSY from the thermal head Close the cassette cover to check that it presses the roller holder ASSY against the thermal head 6 Check that pressi...

Page 43: ...CHAPTER III ELECTRONICS ...

Page 44: ... 7 1 Power ON OFF circuit III 7 2 Power saving circuit III 8 3 2 5 Motor Driver Circuit III 9 3 2 6 Thermal Head Drive Circuit III 10 3 2 7 Voltage Detector Circuit and Temperature Sensor Circuit III 11 1 Voltage detector circuit III 11 2 Ambient temperature sensor circuit III 12 3 2 8 Cassette Sensor Circuit III 13 3 2 9 Cutter Sensor Circuit III 14 3 2 10 Oscillation Circuit III 15 3 2 11 Reset ...

Page 45: ... the sensors that detect the tape width and ink ribbon type in the tape cassette Power Supply PCB This has electrolytic capacitors for output lines an AC line adapter jack battery terminal plates and other related electronic devices to feed power to the control electronics and the DC motor from the AC line adapter or batteries n DC Motor The DC motor is a power source to feed tape and ink ribbon n...

Page 46: ... a ROM and RAM 2 CG ROM 3 LCD driver 4 Key contacts matrix and solder points 5 Power ON OFF circuit and power saving circuit 6 Motor driver circuit 7 Thermal head drive circuit 8 Voltage detector circuit and temperature sensor circuit 9 Cassette sensor circuit 10 Cutter sensor circuit 11 Oscillation circuit 12 Reset circuit 13 5BV power source ...

Page 47: ...III 3 Figure 3 2 1 Block Diagram of Main PCB ...

Page 48: ... particular key is pressed the conductive paint of the key short circuits the paired electrodes carbon printed on the main PCB Figure 3 2 3 shows a timing scheme and waveforms of key scanning by the CPU Ports P30 through P36 on the CPU produce a series of key scanning pulses Every scanning pulse is Low active for 1 ms and in high impedance while inactive Ports P40 through P47 act as input ports wh...

Page 49: ...III 5 Figure 3 2 3 Timing Scheme and Waveforms of Key Scanning by the CPU ...

Page 50: ... specification as listed below Solder points LA0121xxx LA0122001 LA0120001 LA0101001 No point soldered England France Germany U S A CANADA Point 2 soldered Belgium Solder points A through H are reserved for future use for the thermal head ranking The CPU reads the solder point status once during powering on to recognize the customization Figure 3 2 4 Keyboard and Solder Points ...

Page 51: ...nates the chattering signal components in the signal IRQ0 Powering on sequence See Figure 3 2 6 1 Interrupted by IRQ0 the CPU starts the chattering elimination program module 2 If pin 31 is Low for 10 ms the CPU recognizes the On Off key as being pressed and then transfers the control to the main program module If pin 31 is High the CPU interprets the input as a noise and waits for the next IRQ0 3...

Page 52: ...0 ms between ƒ and and then transfers the control to the sleep program module 2 Power saving circuit Figure 3 2 7 shows a circuit diagram of the power saving circuit If you power off the machine with the power On Off key or you make no key entry for approx 5 minutes the CPU turns P11 High to cut off the Vcc which normally would feed power to the logic circuits except the CPU This way the CPU enter...

Page 53: ...op control signal to the motor driver circuit Figure 3 2 9 shows the control signal and drive current waveforms The DC motor integrates an electronic governor circuit which handles the variation of the drive source voltage VBT in order to keep the rotation speed constant Figure 3 2 8 Motor Driver Circuit Figure 3 2 9 Motor Control Signal and Drive Current ...

Page 54: ...of the thermal head according to the signal issued from P03 Figure 3 2 11 shows the timing scheme of the thermal head drive Capacitor C12 works as a thermal head overheat protector It cuts off the P03 signal to shut down invalid drive current if the signal sticks to the Low level due to any malfunctions of the programs or the CPU Since thermal print heads are very sensitive to heat and the head dr...

Page 55: ...printing If the voltage level of the VBT drops below approx 6 9 V the CPU immediately shuts down the power During printing If the voltage level of the VBT drops below approx 6 4 V the CPU displays the following message to warn you of a low battery after completion of printing UK BELGIUM version BATTERIES WEAK FRENCH version PILES USEES GERMAN version BATTERIEN SCHWACH If it drops below approx 6 0 ...

Page 56: ...tor TH1 It converts the resistance of TH1 whose internal resistance varies depending upon the ambient temperature to the voltage variation and then feeds its output to the A D input port PA0 on the CPU According to the Ambient temperature data the CPU determines the optimum head drive power Figure 3 2 13 Ambient Temperature Sensor Circuit ...

Page 57: ...dentifying Tape Cassette Type 0 Switch ON ID hole closed 1 Switch OFF ID hole opened SW1 SW2 SW3 SW4 SW5 Cassette type Tape width 0 0 0 0 0 No cassette loaded 1 1 1 1 1 1 1 0 1 0 0 1 1 1 0 0 0 1 1 1 1 0 1 0 1 0 1 0 0 1 Laminated tape cassette Laminated tape cassette Non Laminated tape cassette Non Laminated tape cassette Non Laminated thermal film tape cassette Iron on transfer tape cassette Insta...

Page 58: ...shing down the cutter lever pivots the attached cutter sensor arm whose tip comes into contact with the switch of the cutter sensor circuit provided on the main PCB Upon receipt of the signal through port P21 the CPU stops printing and tape feeding Figure 3 2 15 Cutter Sensor Circuit ...

Page 59: ...as the CPU basic clock The CPU divides this into half 10 MHz to synchronize its internal operations Figure 3 2 16 Oscillation Circuit 3 2 11 Reset Circuit Figure 3 2 17 shows the reset circuit If the 5BV drops abnormally this circuit prevents the CPU and logic circuitry from malfunctioning Figure 3 2 17 Reset Circuit ...

Page 60: ... 3 2 18 shows a circuit diagram of the 5BV power source A 3 terminal regulator S 81350 stabilizes the battery output or the AC line adapter output producing the 5BV power source within the variation of 0 15V Figure 3 2 18 5BV Power Source ...

Page 61: ...circuit capacitor C2 is for the thermal print head and DC motor drive sources Connecting the AC adapter plug with the AC jack J1 cuts off the power fed from the batteries and feeds power from the AC adapter Figure 3 3 2 shows the polarity of the AC adapter plug Figure 3 3 1 Power Supply PCB Figure 3 3 2 AC Adapter Plug ...

Page 62: ...CHAPTER IV TROUBLESHOOTING ...

Page 63: ...ions 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 IV 11 5 Abnormal LCD indication IV 12 6 Tape cassette type not identified IV 13 ...

Page 64: ...rocedure after reviewing the relationship between them 2 When supplying power to this machine having problems from either a set of batteries or the AC line adapter make sure that its output voltage level is 8 to 10V under no load 3 When supplying power from a stabilized power unit use the power unit with approx 3A capacity and choose the output level of 7 to 9V When connecting it to this machine b...

Page 65: ...IV 2 4 1 3 Troubleshooting Flows 1 Tape feeding failure ...

Page 66: ...IV 3 ...

Page 67: ...IV 4 ...

Page 68: ...IV 5 2 Printing failure ...

Page 69: ...IV 6 ...

Page 70: ...IV 7 ...

Page 71: ...IV 8 3 Powering failure Nothing appears on the LCD ...

Page 72: ...IV 9 ...

Page 73: ...IV 10 ...

Page 74: ...IV 11 4 No key entry possible ...

Page 75: ...IV 12 5 Abnormal LCD indication ...

Page 76: ...IV 13 6 Tape cassette type not identified ...

Page 77: ...APPENDICES Circuit Diagrams A Main PCB B Power Supply PCB ...

Page 78: ...8 8 9 5 9 2 9 1 9 4 9 0 8 6 8 7 7 3 7 7 7 6 1 1 1 7 2 7 1 7 0 6 9 6 8 6 7 3 D B 6 8 5 D B 5 8 4 2 1 9 6 C O M 0 1 0 0 C O M 4 M S V S S 0 V O S C 2 F R O S C 1 9 3 7 8 8 9 7 4 7 5 C 2 1 0 4 D B 4 8 3 D B 3 8 2 D B 2 8 1 D B 1 8 0 D B 0 7 9 N C R 1 2 1 M P A 2 P A 3 D B 7 P 7 1 P 7 0 P 6 7 P 7 2 P 7 3 P 7 4 P 7 5 P 7 6 P 3 4 R S I 5 P 3 3 R S I 4 P 3 2 R S I 3 P 3 1 R S I 2 P 4 0 K I 0 P 3 7 S I _ ...

Page 79: ... V B T D 0 V D 2 A K 0 3 C 2 4 7 0 0 1 6 V C 1 1 0 0 0 1 6 V 2 R E T D 1 R E D B L K P 1 3 1 2 F 1 4 A C C V L 2 E R B 8 3 0 0 4 Appendix B Power Supply PCB NAME CODE POWER SUPPLY CIR 1800 LA0095001 Battery Terminal Ferrite Bead R 0 R 8 C ...

Page 80: ...May 99 5V2092BE0 Printed in Japan ...

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