Brother P-touch bb4 Service Manual2015-05
Contents
1. X X EX X E X X x X X X X X OR X X X x X X X X X 3X Y X X X X 35 X X 3 35 35 35 3 35 3 3 3 fetva IMN 0Sd E1v S2a vOHI ved ptw azd EDHI EZd 14722775 z081 22d eas yzo 2ed SN3S 081 2d 8071 20 384 50371c0 S8d RA2 short circuit P22 8 10SC1 XI 9 12 13 RIO short circuit pattern 7007 AQT E ETO p_e PST3229 8 ar 3 C8 normal pattern A DAI short circuit pattern DTC114YUA R2 short circuit pattern DTC114YUA eid EE RB160L 40 Electronic devices enclosed by a dotted line are not mounted D2 short circuit pattern Aug 2001 8V2018BE0 Printed in Japan2. 3 1 1 OUTLINE OF CONTROL ELECTRONICS Configuration Figure 3 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 Thermal head ASSY p DC motor LCD Key contacts OUT o Select dial Positive terminal for dry cells Negative terminal for dry cells Main PCB Figure 3 1 1 Configuration of the Electronic Part B Main PCB This manages all the components including an LCD DC motor keypad and thermal print head ASSY B Motor The DC motor is a power source to advance tape B 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 TI 1 3 2 MAIN PCB 3 2 1 Block Diagram Figure 3 2 1 shows a block diagram of the main PCB LCD 8 characters x 1 line LCD driver U3 SPLC780A Thermal head drive circuit ON OFF circuit CET MN101C30A Oscillat ircuit 32KB ROM scillation circui 1 5KB RAM Power supply circuit Voltage detection circuit Dial position detection circuit Motor drive circuit Key contacts For 4 keys Solder points Figure 3 2 1 Block Diagram of Main PCB The main PCB consists of the following 1 CPU including a ROM and RAM 2 LCD driver 3 Key cont
3. Grease Shin Etsu Silicone G501 Enter key Orientation keys Figure 2 2 13 Reinstalling the Enter Key Select Dial Claw Select Dial and Dial Sheet II 15 8 Secure the lens with two screws 9 Set the rubber 4 key into place Body cover Figure 2 2 14 Reinstalling the Rubber 4 key and Lens II 16 2 Installing Battery Terminals P2 and P1 1 Snap battery terminals P2 into the bottom cover Battery terminals P2 Bottom cover Figure 2 2 15 Setting Battery Terminals P2 2 Snap battery terminals P1 into the bottom cover Battery terminals P1 Bottom cover Figure 2 2 16 Setting Battery Terminals P1 II 17 3 Installing the Main PCB 1 Secure the main PCB to the body cover with two screws 2 Route the LCD flat cable through the cable guides while pressing them outwards 3 Set the LCD into place while pressing the arms outwards LCD Main PCB Cable guide Body cover Rubber 4 key Figure 2 2 17 Reinstalling the Main PCB 4 Snap each of the plus and minus terminal ASSYs into the bottom cover Plus terminal ASSY Minus terminal ASSY Bottom cover Figure 2 2 18 Setting the Plus and Minus Terminal ASSYs II 18 4 Installing the Chassis ASSY 1 If the chassis ASSY has been disassembled assemble the components referring to page II 21 2 As shown in Figure 2 2 22 fit the cutter lever onto the shaft on the chassis ASSY 3 Put the chassis ASSY tog
4. 1 1 External Appearance 154 mm Figure 1 1 1 External Appearance 1 Dimensions W x D x H 2 Weight Machine proper In package Entry system 1 Rubber keypad 2 Dial Display 1 Display type 2 Number of columns 3 Number of indicators 105 mm x 154 mm x 52 mm Approx 250 y Approx 500 g incl a tape cassette excl dry cells 4 keys 32 positions Liquid crystal display LCD 8 columns x 1 row See Figure 1 1 2 4 See Figure 1 1 2 1 1 4 1 1 5 1 1 6 Printing Mechanism 1 Print system 2 Print speed 3 Print head Type Heat generator Size of a heating element Tape Cassette 1 Cassette 2 Tape type 3 Tape size Direct thermal printing Fixed print head and tape feeding mechanism 7 5 mm second Typical Thermal print head Consists of 64 heating elements vertically aligned 0 136 mm wide by 0 106 mm high Cartridge type Direct thermal print tape Width 9 12mm 4 Tape cassette packed with the machine Character color Black Tape Cutter 1 Tape cutting 2 Cutter unit Length 8m Tape color White Tape width 12 mm or 9 mm EU Tape length 4m Manual cutting with the cutter lever User replaceable I 2 UOISISA M N UOISJOA UEUJJOc UOISISA YOUSI Figure 1 1 2 Key Arrangement 1 I 3 UOISISA VS UOISISA epeueo Figure 1 1 2 Key Arrangement 2 1 4 1 2 ELECTRONICS SPECIFICATIONS 1 2 1 1 2
5. 2 Character Generator 1 No of printable symbols 2 Internal fonts 3 Phrase memory capacity Power Supply 1 Power supply 2 Battery type 3 Service life of batteries 4 Calendar clock default 5 Low voltage indication 31 HELSINKI None Driven by 6 dry cells Alkaline dry cells AM3 LR6 Will last through one tape cassette and then some at room temperature and normal humidity Yes If the machine remains unused for approx 1 minute with its power on then the LCD shows the calendar clock or goes off depending upon your choice If the voltage drops below the following level in entry mode or during printing Then the machine will in clock mode approx 5 86V approx 5 35V Display the BATTERY message approx 5 35V approx 4 94V Turn the LCD off The internal clock remains on approx 2 90V Turn itself off The internal clock and other settings will be reset Chapter II MECHANISMS CONTENTS CHAPTER II MECHANISMS 2 THEORY OF PE TIM nantaise II 1 Zi Pint MATE neige dr mt nn a an ets II 1 2 1 2 Platen Setting amp Retracting Mechanism acicate uk ke II 2 21 3 Tape Feed Mec Mini o cR RUOLI AUR ARA UND ACRI ERR ant cae II 3 2144 Tape Cutter Mechanis ouvir rad II 4 2149 Cutter Safety Lock MSN Mire NA II 5 2 2 DISASSEMBLY amp REASSEMBLY A Mx REM uUa OE mad ii II 6 22 1 Disassembly Procedure aiu drehte ete EROR AAA AAA HEN MA a 1 7 1 Removing the C
6. 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 Opening the cassette cover pulls out its roller holder setting lever so that the roller holder spring retracts the roller holder ASSY from the thermal head providing you with enough space to replace the tape cassette Tape Platen 2 Thermal head Roller holder ASSY Chassis s bent section Tape cassette Shaft Roller holder spring Chassis Roller holder setting lever provided on the cassette cover oW Platen Thermal head N DC motor i i b g Chassis s bent section Chassis Platen spring Shaft Roller holder ASSY Figure 2 1 2 Platen Setting 8 Retracting Mechanism I 2 2 1 3 Tape Feed Mechanism This mechanism consists of a DC motor gear train and roller holder ASSY When you load a tape cassette and close 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 Platen platen gear Thermal head Drive gear DC motor Roller holder ASSY Tape cassette Chassis Figure 2 1 3 Tape Feed Mechanism Tape Cutter Mechanism The cutter mechanism consists
7. contact patterns Each contact pattern has a pair of electrodes Keypad The rubber keypad is made of high impedance silicon rubber As shown in Figure 3 2 3 each key on the rubber keypad consists of a key top rubber spring and conductive paint which functions as a switching element If a particular key is pressed the conductive paint of the key short circuits the paired electrodes carbon printed on the main PCB E Conductive paints Key top E Rubber spring Main PCB Carbon printed electrode Figure 3 2 3 Detailed Diagram of Keypad Key scanning Figure 3 2 4 shows the key scan circuit and solder points The CPU scans four keys including the ON OFF key Ports P50 through P53 on the CPU issue a group of key scanning pulses Port P20 acts as an input port that receives key status Ports P70 through P77 act as input ports that receive solder point status CPU U1 MN101C30A s i Figure 3 2 4 Key Scan Circuit and Solder Points TI 4 Scanning timing The CPU turns ports P50 P51 P52 and P53 Low in this order When not Low those ports are High or in high impedance When a particular port out of them is Low the CPU reads the status of port P20 The CPU scans those key contacts every 10 ms If the CPU reads the ON state on an input port two successive times then it interprets it as the key being pressed if the CPU reads the OFF state six successive times it interprets it as
8. 5 4 1 4 1 1 4 1 2 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 However those samples will help service personnel pinpoint and repair other defective elements if he she analyzes and examines them well Precautions Be sure to observe the following precautions to prevent the secondary problems from happening during troubleshooting 1 Get a good idea of 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 which occurred in the thermal print head and its related sections disconnect the thermal head cable until repairs are finished After Repairing After repairing the defective section be sure to check again to see if the repaired section works correctly In particular if you replace the main PCB make a final operation check given in CHAPTER II Subsection 2 2 2 6 Make a note o
9. Locking pawl of the minus terminal ASSY Figure 2 2 7 Pushing out the Plus and Minus Terminal ASSYs from the Bottom Cover II 11 2 Remove two screws from the main PCB 3 While pressing the 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 Main PCB Body cover Cable guide Dial sheet Rubber 4 key Figure 2 2 8 Taking out the Main PCB with the LCD from the Body Cover II 12 4 Removing Battery Terminals P1 and P2 1 As shown below remove battery terminals P1 from the bottom cover with the flat screwdriver Battery terminals P1 Battery terminals P1 Bottom cover Bottom cover placed upside down Figure 2 2 9 Taking out Battery Terminals P1 from the Bottom Cover 2 As shown below remove battery terminals P2 with the flat screwdriver Battery terminals P2 Battery terminals P2 Bottom cover Bottom cover placed upside down Figure 2 2 10 Taking out Battery Terminals P2 from the Bottom Cover II 13 5 Removing the Rubber 4 Key Lens Dial Sheet Select Dial Select Dial Claw and Enter Key 1 Remove the rubber 4 key 2 Remove the two screws from the lens and take it out Rubber 4 key Figure 2 2 11 Removing the Rubber 4 Key and Lens 3 Remove the three screws and take out the dial sheet The select dial a
10. Low Solder point closed Head rank Generally Q will display Solder points A through C are reserved for future use for thermal head ranking Unless otherwise specified all of those solder points should be opened Voltage level If the voltage level is within the specified range 9 0 0 2V 0 will display If not X will display Calendar clock In the rightmost column of the LCD X in the illustration above the clock cycles through 1 2 3 4 and 5 II 25 2 Press the Enter key LCD check screen 1 will appear as shown below 3 Press the Enter key LCD check screen 2 will appear as shown below All guidance indicators amp cursors ON 4 Press the Enter key LCD check screen 3 will appear as shown below All guidance indicators amp 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 DIAL 2 Make sure that the select dial is placed in Dial position O Blank If it is in any other position turn the select dial to Dial position 0 3 Press the Enter key 0 will display as shown below II 26 4 5 6 Counterclockwise turn the select dial slowly and check that the correct dial position number will be displayed i NOTE Do not turn
11. acts 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 III 2 3 2 2 CPU The CPU U1 MN101C30A is an 8 bit microprocessor produced by CMOS silicon gate process which integrates a 32 kilobyte ROM and a 1 5 kilobyte RAM It controls and manages the entire system 3 2 3 LCD Driver Figure 3 2 2 shows a LCD driver AE EEE 5p seca 00 SEG23 25 SEGe4 79 Se UN 27 c25 78 4A E 28 e25 77 a 29 seco7 76 4 E secos 75 an 31 la sEceg 74 44 Ho 22 ceca 73 Lum zu E Ro Jet a ICI 34 geag 71 dA e KT 8 p co3d 70 oo bi 36 k geag 69 si 7 ec 58 4A CPU Sas bi 39 p E637 a ps CE S 4A E Bo Nom ox 8 8 Mes FH HERE ayy 4 8 Fans Pe4 G S S 3 S d LIE CPU ES y ia B8838238 i P67 Figure 3 2 2 LCD Driver The LCD driver U3 SPLC780A is an LSI which has common drive pins and column drive pins to drive the LCD R16 is an oscillation register that issues display timing signals V1 to V5 of the LCD driver divide Vcc by RA3 R15 to produce multi level power sources required for driving the LCD To display data the CPU writes data onto RS RW E and DB4 through DB7 of the LCD driver III 3 3 2 4 Key Contacts and Solder Points On the main PCB are four carbon printed
12. assette Cover Dry Cells Tape Cassette and Cutter Unit II 7 2 Removing ihe Chassi ASOV c osispnienebiteni rtiecise aaa II 8 3 Removing the Main PCB oocccccccccncnoonnnccnnnnncnnnonnnnncononncnnnnnnnnnncrnnnnnnnnnnnnnnarrnnnnnnnnnans II 11 4 Removing Battery Terminals PT and PZsississsitssissssansenstsanennansaieenattaiensaasaneens e II 13 5 Removing the Rubber 4 Key Lens Dial Sheet Select Dial Select Dial Claw and ne a Au EA UE II 14 222 Reassembly Procedure essere acne Ho AAA 11 15 1 Installing the Enter Key Select Dial Claw Select Dial Dial Sheet Lens and A es eh ie ee 11 15 2 Installing Battery Terminals P2 and Plica ici 1 17 EN MIA Man POB aaa aa 11 18 4 Installing the Chassis ASSY cia it A iaa iia it 11 19 5 Setting the Cutter Unit Tape Cassette Dry Cells and Cassette Cover 1 22 IS Final Operauon VB Mana AA A AAA dia II 23 AT AAN MOBIL etc e dn HEC nest e la MM II 24 2 1 THEORY OF OPERATION Print Mechanism E Structure of Thermal Head This machine uses direct thermal printing The thermal print head has a heat generator consisting of 64 heating elements which are vertically aligned as shown in Figure 2 1 1 Each heating element is 0 136 mm wide by 0 106 mm high 0 106 mm 6 784 mm Le 0 136 mm Figure 2 1 1 Heat Generator of Thermal Head E Printing Process When the cylindrical rubber platen is pressed against the thermal print head with the thermal tape sa
13. der the wires of the plus and minus terminal ASSYs 4 Remove the three screws from the chassis ASSY Soldering iron A Motor lead wires LE Body cover Cutter lever Chassis ASSY Wires of the plus and minus terminal ASSYs Main PCB Figure 2 2 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 1 9 B Disassembling the Chassis ASSY When handling the thermal head ASSY do not touch the thermal head by hand It may be easily damaged due to the 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 Retaining ring Roller holder ASSY g Roller holder spring 7 Thermal head ASSY Be 220 DC motor ASSY Er Cutter lever Am Chassis ASSY Figure 2 2 6 Disassembling the Chassis ASSY II 10 3 Removing the Main PCB 1 From the battery holder 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 Plus terminal ASSY Flat screwdriver Bottom cover ESSA Locking pawl of the plus terminal ASSY
14. em 1 to 2 kgf cm Thermal head ASSY Screw cup M2 6 x 4 1 0 49 Nem 5 kgfecm Main PCB Taptite bind BM2 6x4 2 0 196 Nem 2 kgfscm Lens Taptite bind BM2 6x4 2 0 196 Nem 2 kgfecm Select dial Taptite bind BM2 6x4 3 0 196 Nem 2 kgfscm 2 2 1 Disassembly Procedure 1 Removing the Cassette Cover Dry Cells Tape Cassette and Cutter Unit 1 Turn the machine upside down 2 Press section A of the cassette cover to release the latch and then remove the cassette cover Cassette cover Bottom cover Body cover Figure 2 2 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 Tape cassette Dry cells Cutter unit 2 Removing the Chassis ASSY 1 Remove the two screws from the bottom cover Bottom cover Body cover Figure 2 2 3 Unscrewing 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 Bottom cover Motor lead wires Screwdriver Wires of the plus and minus terminal ASSYs Capacitor vo Main PCB Discharging capacitor C5 Figure 2 2 4 Discharging Capacitor C5 and Disconnecting the Head Flat Cable 3 Unsolder the motor lead wires from the main PCB NOTE Do not unsol
15. er and thermal print head Port 13 switches LVcc that is connected to the LCD driver and its divider resistor If the CPU sets P11 in high impedance to turn Vcc to OV then pressing the ON OFF key switches to the calendar clock mode If the CPU sets P13 to OV to turn LVcc to OV then pressing the ON OFF key switches to the LCD OFF mode CPU U1 MN101C30A Figure 3 2 7 Mode Switching Circuit TI 6 Automatic powering off If you make no key entry for approx 1 minute the CPU automatically enters calendar clock mode or LCD OFF mode when Vcc is OV P11 is in high impedance or LVcc is OV P13 at OV respectively Pressing the ON OFF key in calendar clock mode or LCD OFF mode switches to normal operation mode II 7 3 2 6 Thermal Head Drive Circuit Figure 3 2 8 shows the thermal head drive circuit The thermal head has an integrated heat generator consisting of 64 heating elements vertically aligned in 180 dpi and a built in driver IC Synchronizing with the clock on SBTO the CPU outputs print data on SBOO in serial form One issue contains a total of 64 dots 8 sets of 8 bit data CPU U1 MN101C30A Figure 3 2 8 Thermal Head Drive Circuit Figure 3 2 9 shows a timing chart for thermal head drive SBOO DATA SBTO CLOCK P01 LATCH P03 STROBE NWUUUUUU Figure 3 2 9 Timing Chart for Thermal Head Drive Upon receipt of LATCH signal issued through P01 the t
16. ether 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 Routing the head flat cable Chassis ASSY Cutter lever Bottom cover ae lead Soldering iron Wires of the plus and minus terminal ASSYs i Head flat cable connector Correct Wrong Main PCB Solder points of the motor lead wires Figure 2 2 19 Installing the Chassis ASSY and Soldering the Motor Lead Wires II 19 6 While holding the bottom cover in an angle shown below connect the head flat cable to the main PCB 7 Close the bottom cover Bottom cover Motor lead wires Head flat cable Body cover Wires of the plus and Main PCB minus terminal ASSYs Figure 2 2 20 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 Bottom cover Body cover Figure 2 2 21 Securing the Bottom Cover to the Body Cover II 20 B Assembling the Components of the Chassis ASSY 1 Secure the DC motor ASSY to the chassis with two screws so that the motor lead wires face as shown below 2 Set the roller holder spring onto the roller holder ASSY so tha
17. f the troubleshooting procedure so that it will be handy should problems occur in the future IV 1 4 1 3 Troubleshooting Flows 1 Tape feeding failure The tape is not fed correctly Replace the tape cassette with a new one then try printing again Y End of repair The old tape cassette may be defective N Normal tape feeding Is there any foreign material on the platen Y Clean it up Does each Gear of the chassis ASSY rotate normally when the DC motor is driven without the tape cassette Are the motor lead wires soldered correctly Y Replace the roller holder ASSY with a new one Y N Solder those wires correctly Are the motor lead wires broken Replace the motor with a new one Replace the main PCB with a new one IV 2 2 Printing failure The tape is fed normally but no printing occurs Replace the dry cells with new ones Is the printing normal End of repair Is the head flat cable connected correctly Correct it Are the thermal head and platen dirtied Clean them up Replace the thermal head ASSY thermal head defective witha new on Is the roller holder ASSY defective Replace the main PCB with a new one Replace the roller holder ASSY with a new one IV 3 3 Powering failure Nothing appears on the LCD Pressing the ON OFF key does not turn
18. hermal head drive circuit latches the serial data sent through SBOO and supplies the power to the thermal head ASSY according to the STROBE signal issued through P03 The CPU controls the ON time length of the thermal print head according to the VBT level applied to the thermal head If the VBT level is low the CPU increases the ON time length if high the CPU decreases it III 8 3 2 7 Oscillation Circuit Figure 3 2 10 shows the oscillation circuit This circuit contains two oscillators to generate 8 00 MHz frequency which acts as a CPU basic clock and 32 768 kHz frequency for calendar clock CPU U1 MN101C30A Figure 3 2 10 Oscillation Circuit 3 2 8 Voltage Detection Circuit Figure 3 2 11 shows the voltage detection circuit To oo tj uj E bi do A CPU U1 MN101C30A Figure 3 2 11 Voltage Detection Circuit This circuit which is composed of divider resistors R8 and R9 steps down the power source VBT fed from dry cells and feeds the output to analog input port ANT on the CPU According to the drive source voltage the CPU determines the optimum head driver power If the voltage drops below the following level in entry mode or Then the machine will during printing in clock mode approx 5 86V approx 5 35V Display the BATTERY message approx 5 35V approx 4 94V On off The internal clock Turn itself off The internal clock and other Ap
19. llowing message appears and the machine automatically turns itself off then check the solder points on the main PCB Two or more solder points may be closed or wrong solder point may be closed SLD X II 24 INFO submode Dial position 1 and Enter key In any other submode setting the select dial to Dial position 1 and pressing the Enter key will jump to INFO submode except during checking in DIAL submode The moment the machine enters the inspection mode it shows INFO indicating that the machine is placed in INFO submode In INFO submode you may check the destination head rank voltage level calendar clock and LCD operation 1 Press the Enter key The following screen sample will appear where you may check the destination head rank voltage level and calendar clock Head rank Voltage level Destination Calendar clock US 0 0 X If the destin the destination is USA or Canada for example US will display The destination is determined by solder points 1 through 5 Solder pom Destination USA Canada France xy cy cy cy cy TT I Ly cy TITI Germany Switzerland Belgium Netherlands Holland England Ireland South Africa Italy Spain Denmark FIIITITITITLIT Ly Lye cy ry T r r rmrmIim IT C TIT IT T A gt A Norway rT r r r ir mr amrimr omrimririmrr I r I Sweden H High Solder point opened L
20. lso comes off 4 Remove the select dial claw from the body cover 5 Unlatch the Enter key from the select dial Dial sheet Body cover Select dial claw Select dial y Gp Enter key Figure 2 2 12 Removing the Dial Sheet Select Dial Select Dial Claw and Enter key II 14 2 2 2 Reassembly Procedure 1 Installing the Enter Key Select Dial Claw Select Dial Dial Sheet Lens and Rubber 4 Key 1 Apply a rice sized pinch of grease to each lubrication point Select dial Apply a rice sized pinch of grease Shin Etsu Silicone G501 to each of the two lubrication points on the end of the body cover which the inside of the select dial will come into contact with as shown below Snap the Enter key into the select dial according to the orientation keys 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 Place the body cover upside down 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 While pushing up the select dial put the dial sheet Secure the select dial and dial sheet with three screws Check that the select dial rotates smoothly Body cover After setting the select dial claw to the body cover apply a rice sized pinch of grease here Select dial claw
21. ndwiched inbetween the CPU applies 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 B Character Formation While the drive motor DC motor feeds the tape by 0 106 mm for 13 8 ms the thermal head generates heat once The feed amount of 0 106 mm is smaller than the width 0 136 mm of the heating elements so that the heat generated at one heating cycle will overlap with the next heating cycle This forms a character having no gap between adjacent printed dots II 1 Platen Setting amp Retracting Mechanism This mechanism consists of the roller holder ASSY and the roller holder setting lever wedged lever provided on the inside of the cassette cover The roller holder ASSY supports the platen so that the platen can move perpendicularly to the thermal head and rotate freely Closing the cassette cover fits its roller holder setting lever into the slot between the roller holder ASSY and the chassis s bent section This 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
22. of a cutter lever and a cutter unit in which a blade is retracted by a spring Pressing the cutter lever pushes 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 Cutter board Tape Spring P Cutter lever E Tape cassette Blade Cutter unit Figure 2 1 4 Tape Cutter Mechanism Cutter Safety Lock Mechanism When the cassette cover is opened and no tape cassette is loaded the roller holder ASSY is retracted from the thermal head with the roller holder spring as described in Subsection 2 1 2 In this retracted position the cutter lever stopper of the roller holder ASSY blocks the end of the cutter lever preventing the cutter lever from pushing the cutter blade out of the 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 roller holder ASSY towards the thermal head so that the cutter leve
23. orotner SERVICE MANUAL MODEL P touch BB4 MECHANISMS amp ELECTRONICS Orother SERVICE MANUAL MODEL P touch BB4 Copyright Brother 2001 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 PREFACE This publication is a service manual covering the specifications theory of operation disassembly reassembly procedure and troubleshooting of the Brother P touch BB4 It is intended for service personnel and other concerned persons to accurately and quickly provide after sale service for our P touch BB4 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 appendix CHAPTER I SPECIFICATIONS CHAPTER IT MECHANISMS CHAPTER IM ELECTRONICS CHAPTERIV TROUBLESHOOTING APPENDIX CIRCUIT DIAGRAM Chapter I SPECIFICATIONS CONTENTS CHAPTER I SPECIFICATIONS al 1 2 MECHANICAL SPECIFICATIONS ir A di I 1 iE SEE T up Ee ii dr PEE UU T I 1 1 4 2 Entry SyS EM ini A AAA AAA 1 1 UAE C eee nee eee 1 1 ok PEDO III rra EIA I 2 1 1 5 VR olm o RR ER I 2 the Tape IM iria 1 2 ELECTRONICS SPECIFICATIONS usar 1 5 Lai ERICA Ta c c RR 1 5 Lez POWE ONU AAA AA I 5 1 1 MECHANICAL SPECIFICATIONS 1
24. prOX AMUN settings will be reset III 9 3 2 9 Power Supply Circuit Figure 3 2 12 shows a power supply circuit The 3 terminal regulator RH5RL33A stabilizes the battery output producing the 3 3V power source Capacitor C13 is for the logic circuit and C5 is for driving the thermal head and DC motor Figure 3 2 12 Power Supply Circuit 3 2 10 Motor Drive Circuit Figure 3 2 13 shows the drive circuit of the DC motor which feeds tape Through P10 the CPU produces a start stop control signal to the motor drive circuit Figure 3 2 14 shows waveforms of control signal and motor drive current Electronic governor IC U4 BA6220 controls this circuit to keep the rotation speed of the DC motor constant even if the power supply voltage VBT varies CPU U1 MN101C30A i i a DTC114YUA Figure 3 2 13 Motor Drive Circuit III 10 Print start Motor start Motor stop CPU port P10 _ Motor current l i l z E Lae Reference values T 300 to 400 mA 90 to 140 mA 40 to 60 ms 154 ms Figure 3 2 14 Waveforms of Control Signal and Motor Drive Current TI 11 3 2 11 Dial Position Detection Circuit Dial LED scanning Figure 3 2 15 shows the LED scan circuit that detects the dial position The CPU scans five LEDs Ports LEDO through LED4 on the CPU issue a group of LED scanning pulses Port AN2 through AN6 act as input ports that receive LED sta
25. r stopper does not interfere with the cutter lever Thermal head Cutter lever K Cutter lever stopper of 2 the roller holder ASSY Roller holder spring Roller holder ASSY Figure 2 1 5 Cutter Safety Lock Mechanism Roller holder setting lever provided on the inside of the cassette cover Thermal head Cutter lever Cutter lever Roller holder S Roller holder ASSY ASSY Tab of the roller Tape cassette holder ASSY Closing the cassette cover Loading a tape cassette Figure 2 1 6 Releasing the Cutter Safety Lock Mechanism 2 2 DISASSEMBLY REASSEMBLY B Safety Precautions 1 You should carry out disassembly amp reassembly jobs on an anti static sheet grounded correctly Otherwise the LSI and other electronic devices will 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 4 Be careful not to lose screws washers or other parts removed for parts replacement 5 Tighten screws to the torque values listed below B Tightening Torque List Location Screw type Q ty Tightening torque Bottom cover Taptite bind BM2 6x6 2 0 39 Nem 4 kgfecm Chassis ASSY Taptite bind BM2 6x4 3 0 196 Nem 2 kgf cm Chassis ASSY for DC motor Screw pan M1 7 x 2 5 2 0 10 to 0 196 N
26. symbol should be established Press the Print key The selected item should be printed out Push the cutter lever The cutter lever should work smoothly and cut off the tape Check that the printout is not faint 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 II 23 7 Inspection Mode Enter the inspection mode according to the procedure given below and make the final check In the inspection mode you use four submodes INFO DIAL CUT and PRINT1 submodes TIP The inspection mode supports a total of nine submodes for factory checking That is there are five more submodes which are not described in this manual Even if the machine enters any of those five modes you do not need to perform them To escape from the mode and proceed to any of the INFO DIAL CUT and PRINT1 submodes rotate the select dial to any of Dial positions 1 to 4 respectively and then press the Enter key 1 Check that the LCD shows the calendar clock or its setting screen 2 Set the select dial to Blank position Dial position Submode 0 Blank INFO submode DIAL submode CUT submode PRINT1 submode Enter key Select dial 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 INFO NOTE If the fo
27. t 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 NUES Straight end of the Retaining ring o roller holder spring Roller holder ASSY Roller holder spring lt Thermal head ASSY WN DC motor ASSY Cutter lever a Chassis ASSY Motor lead wires Bent end of the roller holder spring Roller holder spring Figure 2 2 22 Assembling the Components of the Chassis ASSY II 21 5 Setting the Cutter Unit Tape Cassette Dry Cells and Cassette Cover Set the cutter unit into place Set a tape cassette 1 2 3 Load six dry cells 4 First fit the hook of the cassette cover and then snap the cover into place Cassette cover Cutter unit 1 ia NE wen SR Tape cassette Body cover Dry cells Figure 2 2 23 Setting the Cutter Unit Tape Cassette Dry Cells and Cassette Cover Il 22 6 Final Operation Check After reassembling do the following 1 2 3 o 0c A HS Y Load dry cells The display should blink Press the Power key twice The calendar clock should appear Turn the select dial to the desired position and press the Enter key The selected
28. the key being released The input mode of this keying system is 2 key roll over and 3 key lockout 10 ms AH P50 eed eee a electis tre ap TE L Ml Figure 3 2 5 Key Scan Timing Scheme and Scanning Pulse Outputs Solder points The CPU reads the solder point status once in the powering in sequence to recognize the customization Solder points 1 through 5 customize the machine for the destination shipping country Los Spain H t H H H 06 Netheriands Holland H H H H L H H Destination No 09 Denmark LT HHH H No Solder Points No H Solder point opened L Solder point closed Solder points A through C are reserved for the future use for the thermal head ranking According to the soldered status the CPU determines the ON time length of the thermal print head I 5 3 2 5 ON OFF Key and Its Circuit ON OFF key As shown in Figure 3 2 6 pressing the ON OFF key turns the CPU s IRQO Low so as to interrupt the CPU Releasing the ON OFF key turns the IRQO High Upon detection of the High IRQO the CPU checks the P11 and P13 status According to the status it switches to the normal operation mode calendar clock mode or LCD OFF mode The power key is pressed The power key is released i m Figure 3 2 6 ON OFF Sequence Switching between calendar clock mode and LCD OFF mode Port P11 on the CPU switches Vcc that is connected to the photo interrupt
29. the machine on nothing appears on the LCD Are specified dry cells loaded Alkaline dry cells AM3 LR6 Replace them with the specified ones Are the dry cells loaded with right Correct the loading direction polarity The output of dry cells may be less than 8V Replace the dry cells with new one Remove dry cells and discharge electrolytic capacitor C5 Is the machine hung up Are the positive and negative terminals broken Replace the main PCB with a new one End of repair Power supplied Replace the main PCB with a new one IV 4 4 Abnormal LCD indication Certain display postion s show abnormal indication Replace the main PCB with a new one 5 No key entry possible No key entry is possible _ Any dust or Clean the key contacts or foreign material on the replace the rubber 4 keypad key contacts with a new one The keypad pattern is defective Replace the main PCB with a new one The key scanning Replace the main PCB with signal is normal a new one IV 5 APPENDIX Circuit Diagram Main PCB Appendix Main PCB CIRCUIT DIAGRAM BB4 LA6235000 5 5 5 5 5 5 CODE VOBL91dS
30. the select dial quickly or clockwise Doing so cannot check the dial operation correctly If the select dial is set to any wrong position X will display as shown below In the sample below the select dial should be set to Dial position 2 but now it is set to any other position Turn the select dial to Dial position 2 clockwise or counterclockwise 2 After checking dial position 31 turn the select dial to the next position Dial position 0 then OK will appear and OK will be printed C co N After printing is complete the screen will automatically change from OK to CUT 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 The cutter operation may be checked in any other submode so you may skip this CUT submode and proceed to PRINT1 submode To do so turn the select dial to Dial position 4 and press the Enter key 1 CUT Press the Enter key While displaying the following the machine will feed tape FEED II 27 After feeding tape the machine will display the following 2 Press the Enter key While displaying the following the machine will feed tape FEED After feeding tape the machine will display the following ii 3 Press the Enter key While displaying the following the machine
31. tus Scanning timing The CPU turns ports LEDO LED1 LED2 LED3 and LED4 Low in this order When not Low those ports are High or in high impedance When a particular port out of them is Low the CPU reads the status of the corresponding port The CPU scans those LEDs every 50 ms If the CPU reads the same pattern on input ports five successive times then it interprets it as the current dial position Figure 3 2 16 shows the waveforms of dial LED scanning pulse outputs CPU U1 MN101C30A Figure 3 2 15 Dial Position Detection Circuit III 12 LEDO See eer ary orate le une gt Min 1 ms LEDI ahaa un o ada OE TAA a RR gue Min 1 ms L D2 SFR SES Cl Aas sete a Seca Ste ag ein eS S Sein ene Min 1 ms MA E a E e sateiesccos gt Min 1 ms LEDA yo pee S Min 1 ms Figure 3 2 16 Waveforms of Dial Scanning Pulse Outputs III 13 Chapter IV TROUBLESHOOTING CONTENTS CHAPTER IV TROUBLESHOOTING Ad TABLES Ia a vn ide sini ia ae ede d n IV 1 LANES I e s EE UE I sees acces IV 1 2 1 2 Alter LC n oM TU UU m IV 1 US WI A IV 2 TI Tape TESIS TAUG esa NAAA IV 2 2 PO ia IV 3 3 Powering failure Nothing appears on the LCD IV 4 141 Abnormal A ioo M H B IV 5 8 Mo Key enr possible sse civi Er ERE Pe RUE PA PHA FACER ER E ACER EAE E RACER Th IV
32. will feed tape EED After feeding tape the machine will display the following i 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 PRINTI 2 Press the Enter key The machine will print out the following print sample 247 dots 25 2 3 mm in length Best before les po Jan 12 25 2 3 mm After printing the machine will automatically escape from the inspection mode and return to the clock mode If the machine remains in PRINT1 submode press the Enter key II 28 Chapter III ELECTRONICS CONTENTS CHAPTER III ELECTRONICS 1 OUTLINE OF CONTROL ELECTRONICS cisnes III 1 CA RE C DI TRETEN III 1 3 2 MAIN A P LM MEME LM EMILE M ALI MEME III 2 2 Block NBI ir RE UU III 2 ge Ee 0 e III 3 mos ELDER Lond iip rad peni dai da ORA TM URNA teen III 3 3 2 4 Kay Contacts and Solder POIS cuina it iii III 4 ou ONOFF Key dnd I5 IU ri III 6 Pu WR iN coru fe ri mer liuEus III 8 Sar SPC COIN traten ARE PELO DITE DH M III 9 3 2 8 Voltage Detection eel RT T m III 9 gag POR DUO Ca e mmm III 10 AA eera er aAa erai rairai III 10 3 2 11 Wiel Position Detection Circuit ousoiesikiennisiadekREi AAA III 12 3 1
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