CONTENTS
CHAPTER III ELECTRONICS........................................................................... III-1
3.1 OVERVIEW .......................................................................................................... III-1
3.1.1 Configuration of the Electronic Part................................................................ III-1
3.1.2 Main PCB....................................................................................................... III-1
3.1.3 Sub PCB ........................................................................................................ III-1
3.1.4 Motor.............................................................................................................. III-1
3.1.5 Thermal Head ................................................................................................ III-1
3.2 MAIN PCB............................................................................................................. III-2
3.2.1 Main PCB Block Diagram............................................................................... III-2
3.2.2 CPU and LCD Driver...................................................................................... III-3
3.2.3 Key Contacts Matrix ....................................................................................... III-4
[ 1 ] Key contacts matrix..................................................................................... III-4
[ 2 ] Solder points ............................................................................................... III-5
[ 3 ] Jog Dial (Only for PT-1250/1160) ................................................................ III-6
3.2.4 On/Off Key/Reset Circuit and Power Saving Circuit........................................ III-7
[ 1 ] Power On/Off circuit.................................................................................... III-7
[ 2 ] Power saving circuit .................................................................................... III-8
3.2.5 Motor Control Circuit ...................................................................................... III-9
3.2.6 Thermal Head Drive Circuit............................................................................ III-10
3.2.7 Voltage Detection Circuit and Temperature Sensor circuit.............................. III-11
[ 1 ] Voltage detection circuit .............................................................................. III-11
[ 2 ] Ambient temperature sensor circuit ............................................................. III-12
3.2.8 Oscillation Circuit ........................................................................................... III-13
3.2.9 Power Supply Circuit...................................................................................... III-14
3.2.10 Cassette Sensor Circuit.................................................................................. III-15
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