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Brother P-touch mini' tech Service Manual Download Page 15

II

 - 7

2.2.2

Main PCB

[ 1 ]

  Block Diagram

Figure 2.2-2 shows a block diagram of the main PCB.

 Figure 2.2-2  Block Diagram of Main PCB

The main PCB consists of the following:

(1) CPU (including a ROM and RAM)

(2) LCD driver

(3) Key contacts and solder points

(4) ON/OFF key and its circuit

(5) Thermal head drive circuit

(6) Oscillation circuit

(7) Voltage detection circuit

(8) Power supply circuit

(9) Motor drive circuit

(10) Dial position detection circuit

Summary of Contents for P-touch mini' tech

Page 1: ...SERVICE MANUAL MODEL PT MT P touch mini tech ...

Page 2: ...at 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 appendix CHAPTER I SPECIFICATIONS CHAPTER II THEORY OF OPERATION CHAPTER III DISASSEMBLY REASSEMBLY CHAPTER IV TROUBLESHOOTING APPENDIX MAIN PCB CIRCUIT DIAGRAM Copyright Brother 2002 All rights reserved No part of this publi...

Page 3: ... II 1 2 1 2 Platen Setting Retracting Mechanism II 2 2 1 3 Tape Feed Mechanism II 3 2 1 4 Tape Cutter Mechanism II 4 2 1 5 Cutter Safety Lock Mechanism II 5 2 2 Outline of Control Electronics II 6 2 2 1 Configuration II 6 2 2 2 Main PCB II 7 CHAPTER III DISASSEMBLY REASSEMBLY 3 1 Disassembly Procedure III 2 1 Removing the Cassette Cover Dry Cells Tape Cassette and Cutter Unit III 2 2 Removing the ...

Page 4: ...g the Cutter Unit Tape Cassette Dry Cells and Cassette Cover III 17 6 Final Operation Check III 18 7 Inspection Mode III 19 CHAPTER IV TROUBLESHOOTING 4 1 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 3 3 Powering failure Nothing appears on the LCD IV 4 4 Abnormal LCD indication IV 5 5 No ke...

Page 5: ...x H 105 mm x 154 mm x 52 mm 2 Weight Machine proper Approx 250 g In package Approx 500 g incl a tape cassette excl dry cells 1 1 2 Entry system 1 Rubber keypad 4 keys 2 Dial 32 positions 1 1 3 Display 1 Display type Liquid crystal display LCD 2 Number of columns 8 columns x 1 row See Figure 1 1 2 3 Number of indicators 7 See Figure 1 1 2 ...

Page 6: ...ements vertically aligned Size of a heating element 0 136 mm wide by 0 106 mm high 1 1 5 Tape Cassette 1 Cassette Cartridge type 2 Tape type Direct thermal print tape 3 Tape size Width 9 12 mm Length 8 m 4 Tape cassette packed with the machine Character color Black Tape color White Tape width 12 mm or 9 mm EU Tape length 4 m 1 1 6 Tape Cutter 1 Tape cutting Manual cutting with the cutter lever 2 C...

Page 7: ...I 3 Figure 1 1 2 Key Arrangement 8 columns x 1 row ...

Page 8: ...ery type Alkaline dry cells AM3 LR6 3 Service life of batteries Will last through one tape cassette and then some at room temperature and normal humidity 4 Automatic powering off Yes If the machine remains unused for approx 5 minutes it automatically turns itself off 5 Low voltage indication If the voltage drops below the following level On standby in the entry mode During printing Then the machin...

Page 9: ...lies electric power to the selected ones of those 64 heating elements The selected heating element s generates heat that dissolves the metal deposit layer of the thermal tape so as to reveal the substrate layer producing a dot on the tape The tape is advanced and the next heating cycle is repeated thus forming a character on the tape Character Formation While the drive motor DC motor feeds the tap...

Page 10: ...s pivots the roller holder ASSY around the shaft provided on the chassis so as to press the roller holder ASSY against the thermal head The platen is pressed perpendicularly against the thermal head with the tape sandwiched inbetween under a uniform load by the platen spring At the same time the platen gear becomes engaged with the drive gear of the gear train on the chassis see Figure 2 1 3 Openi...

Page 11: ...se the cassette cover the platen and the thermal head sandwich the tape inbetween and the platen gear becomes engaged with the gear train as described in Subsection 2 1 2 As the DC motor rotates the rotation is transmitted via the gear train to the platen gear Accordingly the sandwiched tape will be advanced Figure 2 1 3 Tape Feed Mechanism ...

Page 12: ...out the blade from the cutter unit The blade presses the printed tape against the cutter board of the tape cassette cutting the tape coming through the cutter unit and the cutter board When the cassette cover is opened and no tape cassette is loaded the cutter safety mechanism works to lock the cutter lever as described in Subsection 2 1 5 Figure 2 1 4 Tape Cutter Mechanism ...

Page 13: ...cutter unit for safety as shown below Closing the cassette cover or loading a tape cassette releases the cutter safety lock mechanism If you close the cassette cover the roller holder ASSY pivots towards the thermal head so that the cutter lever stopper does not interfere with the cutter lever When a tape cassette is loaded its outer edge pushes the tab of the roller holder ASSY to pivot the rolle...

Page 14: ...d thermal print head ASSY Figure 2 2 1 Configuration of the Electronic Part Main PCB This manages all the components including an LCD DC motor keypad and thermal print head ASSY Motor The DC motor is a power source to advance tape Thermal Print Head This is a thick film thermal print head which integrates a heat generator consisting of 64 heating elements vertically aligned and driver circuitry ...

Page 15: ... of Main PCB The main PCB consists of the following 1 CPU including a ROM and RAM 2 LCD driver 3 Key contacts and solder points 4 ON OFF key and its circuit 5 Thermal head drive circuit 6 Oscillation circuit 7 Voltage detection circuit 8 Power supply circuit 9 Motor drive circuit 10 Dial position detection circuit ...

Page 16: ...rts such as wires PCBs and covers 4 Be careful not to lose screws washers or other parts removed for parts replacement 5 Tighten screws to the torque values listed below Tightening Torque List Location Screw type Q ty Tightening torque Bottom cover Taptite bind B M2 6 x 6 2 0 39 N m 4 kgf cm Chassis ASSY Taptite bind B M2 6 x 4 3 0 196 N m 2 kgf cm Chassis ASSY for DC motor Screw pan M1 7 x 2 5 2 ...

Page 17: ... Press section A of the cassette cover to release the latch and then remove the cassette cover Figure 3 1 1 Removing the Cassette Cover 3 Remove six dry cells tape cassette and cutter unit For easier removal of the tape cassette first lift up edge B and then pull it out Figure 3 1 2 Removing the Dry Cells Tape Cassette and Cutter Unit ...

Page 18: ...the Bottom Cover 2 Slightly open the bottom cover discharge capacitor C5 with a screwdriver or the like and then disconnect the head flat cable from the main PCB as illustrated below NOTE Take care not to bend the head flat cable Figure 3 1 4 Discharging Capacitor C5 and Disconnecting the Head Flat Cable ...

Page 19: ...t unsolder the wires of the plus and minus terminal ASSYs 4 Remove the three screws from the chassis ASSY Figure 3 1 5 Unsoldering the Motor Lead Wires and Removing the Chassis ASSY 5 Lift the chassis ASSY up and out of the bottom cover The cutter lever also comes off ...

Page 20: ...he electricity charged in your body 1 Remove the screw from the thermal head ASSY and take off the ASSY 2 Remove the retaining ring from the shaft of the chassis ASSY 3 Pull up the roller holder ASSY together with its spring 4 Remove the two screws from the chassis ASSY and take off the DC motor ASSY Figure 3 1 6 Disassembling the Chassis ASSY ...

Page 21: ...r side of the bottom cover unlatch the locking pawl of each of the plus and minus terminal ASSYs with the tip of a flat screwdriver and then push them out of the bottom cover Figure 3 1 7 Pushing out the Plus and Minus Terminal ASSYs from the Bottom Cover ...

Page 22: ... guides of the LCD flat cable outwards slightly slide the LCD flat cable to the right and left and release it NOTE Take care not to bend the LCD flat cable 4 Unlatch the LCD and take it out gently Figure 3 1 8 Taking out the Main PCB with the LCD from the Body Cover ...

Page 23: ...ttery terminals P1 from the bottom cover with the flat screwdriver Figure 3 1 9 Taking out Battery Terminals P1 from the Bottom Cover 2 As shown below remove battery terminals P2 with the flat screwdriver Figure 3 1 10 Taking out Battery Terminals P2 from the Bottom Cover ...

Page 24: ...ws from the lens and take it out Figure 3 1 11 Removing the Rubber 4 Key and Lens 3 Remove the three screws and take out the dial sheet The select dial also comes off 4 Remove the select dial claw from the body cover 5 Unlatch the Enter key from the select dial Figure 3 1 12 Removing the Dial Sheet Select Dial Select Dial Claw and Enter key ...

Page 25: ...rientation keys 3 Set the select dial claw to the body cover After setting apply a rice sized pinch of grease Shin Etsu Silicone G501 to the top of the select dial claw as shown below 4 Place the body cover upside down 5 Set the select dial to the body cover while aligning any low section of the inner dial face with the top of the select dial claw 6 While pushing up the select dial put the dial sh...

Page 26: ...III 11 8 Secure the lens with two screws 9 Set the rubber 4 key into place Figure 3 2 2 Reinstalling the Rubber 4 key and Lens ...

Page 27: ...ling Battery Terminals P2 and P1 1 Snap battery terminals P2 into the bottom cover Figure 3 2 3 Setting Battery Terminals P2 2 Snap battery terminals P1 into the bottom cover Figure 3 2 4 Setting Battery Terminals P1 ...

Page 28: ...e the LCD flat cable through the cable guides while pressing them outwards 3 Set the LCD into place while pressing the arms outwards Figure 3 2 5 Reinstalling the Main PCB 4 Snap each of the plus and minus terminal ASSYs into the bottom cover Figure 3 2 6 Setting the Plus and Minus Terminal ASSYs ...

Page 29: ...Put the chassis ASSY together with the cutter lever back into the bottom cover NOTE Route the head flat cable as illustrated below 4 Secure the chassis ASSY with three screws 5 Solder the motor lead wires to the main PCB as shown below NOTE Check the wire ID colors then solder the black and red wires to the BLACK and RED points respectively Figure 3 2 7 Installing the Chassis ASSY and Soldering th...

Page 30: ...e head flat cable to the main PCB 7 Close the bottom cover Figure 3 2 8 Connecting the Head Flat Cable 8 Secure the bottom cover to the body cover with two screws taking care not to pinch the wires between those covers Figure 3 2 9 Securing the Bottom Cover to the Body Cover ...

Page 31: ...oller holder ASSY so that its straight end is fitted into section A on the ASSY then install them to the chassis and secure the ASSY with the retaining ring 3 As shown below turn the bent end of the roller holder spring with a flat screwdriver and fit it into an oval hole provided in the chassis Then secure the thermal head ASSY with a screw Figure 3 2 10 Assembling the Components of the Chassis A...

Page 32: ...ls and Cassette Cover 1 Set the cutter unit into place 2 Set a tape cassette 3 Load six dry cells 4 First fit the hook of the cassette cover and then snap the cover into place Figure 3 2 11 Setting the Cutter Unit Tape Cassette Dry Cells and Cassette Cover ...

Page 33: ...symbol should be established 4 Press the Print key The selected item should be printed out 5 Push the cutter lever The cutter lever should work smoothly and cut off the tape 6 Check that the printout is not faint 7 Open the cassette cover and remove the tape cassette and dry cells The above final operation check should be usually made For your reference the inspection mode is described in 7 ...

Page 34: ...is initiated skip it by rotating the select dial to any of Dial positions 1 to 4 to proceed to the INFO KEY CUT or PRINT1 submode respectively Then press the Enter key 1 Check that the PT MT is turned off 2 Set the select dial to Dial position 3 While holding down the Print key press the Function key f The machine enters the inspection mode and shows the following on the LCD NOTE If the following ...

Page 35: ...estination If the destination is UK for example UK will display The destination is determined by solder points 1 through 5 Solder points ROM spec Destination The LCD shows 1 2 3 4 5 GE Germany GE H H H H H England UK H H H H H France FR L H H H H Netherlands Holland HO H L H H H Spain SP L L H H H Italy IT H H L H H Sweden SW L H L H H Norway NO H L L H H Switzerland SZ H H H L H EU Belgium BE L H...

Page 36: ...rs cursors ON DIAL submode Dial position 2 and Enter key In any other submode setting the select dial to Dial position 2 and pressing the Enter key will jump to DIAL submode 1 When LCD check screen 3 is displayed press the Enter key The machine shows the following and enters DIAL submode 2 Make sure that the select dial is placed in Dial position If it is in any other position turn the select dial...

Page 37: ...e select dial to the next position Dial position then OK will appear and OK will be printed 6 Press the cutter lever and cut the tape CUT submode Dial position 3 and Enter key In any other submode setting the select dial to Dial position 3 and pressing the Enter key will jump to CUT submode except during checking in DIAL submode TIP The cutter operation may be checked in any other submode so you m...

Page 38: ...owing PRINT1 submode Dial position 4 and Enter key In any other submode setting the select dial to Dial position 4 and pressing the Enter key will jump to PRINT1 submode except during checking in DIAL submode 1 When 3 is displayed press the Enter key The machine shows the following and enters PRINT1 submode 2 Press the Enter key The machine will print out the following print sample 442 dots 46 8 5...

Page 39: ...f what the trouble is Whenever more than one trouble source is found plan the most reasonable repairing procedure after reviewing the relationship between them 2 When supplying power to this machine having problems make sure that its output voltage level is 8 to 10V under no load 3 When starting disassembly jobs first remove dry cells and discharge electrolytic capacitor C5 4 To repair an error wh...

Page 40: ...IV 2 4 1 3 Troubleshooting Flows 1 Tape feeding failure ...

Page 41: ...IV 3 2 Printing failure ...

Page 42: ...IV 4 3 Powering failure Nothing appears on the LCD ...

Page 43: ...IV 5 4 Abnormal LCD indication 5 No key entry possible ...

Page 44: ...NAME CODE LA7463000 CIRCUIT DIAGRAM PT MT APPENDIX MAIN PCB CIRCUIT DIAGRAM ...

Page 45: ...Apr 2002 8V2036BE0 Printed in Japan ...

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