Table Of Contents - Brother PT-1090 Service Manual

CHAPTER I SPECIFICATIONS
1.1 Mechanical Specifications .........................................................................................................I-1
1.1.1 External Appearance ...........................................................................................................I-1
1.1.2 Keyboard .............................................................................................................................I-1
1.1.3 Display.................................................................................................................................I-1
1.1.4 Printing Mechanism.............................................................................................................I-2
1.1.5 Tape Cassette.......................................................................................................................I-2
1.1.6 Tape Cutter ..........................................................................................................................I-2
1.2 Electronics Specifications..........................................................................................................I-4
1.2.1 Character Generator.............................................................................................................I-4
1.2.2 Power Supply.......................................................................................................................I-4
1.3 Key Commands for Special Functions ......................................................................................I-5
1.3.1 Initializing............................................................................................................................I-5
CHAPTER II THEORY OF OPERATION
2.1 Outline of Mechanisms............................................................................................................ II-1
2.1.1 Print Mechanism................................................................................................................ II-1
2.1.2 Roller Holder ASSY Setting & Retracting Mechanism .................................................... II-2
2.1.3 Tape & Ribbon Feed Mechanism...................................................................................... II-4
2.1.4 Tape Cutter Mechanism .................................................................................................... II-6
2.1.5 Cutter Safety Lock Mechanism ......................................................................................... II-7
2.1.6 Cutter Jam Prevention Mechanism.................................................................................... II-8
2.2 Outline of Control Electronics................................................................................................. II-9
2.2.1 Configuration..................................................................................................................... II-9
2.2.2 Main PCB ........................................................................................................................ II-11
[ 1 ] Block Diagram............................................................................................................... II-11
[ 2 ] Solder Points.................................................................................................................. II-12
[ 3 ] Identification of Tape Cassette Type............................................................................. II-13
CHAPTER IIIDISASSEMBLY & REASSEMBLY
3.1 Disassembly/Reassembly ....................................................................................................... III-2
3.1.1 Disassembly Procedure .................................................................................................... III-2
[ 1 ] Removing the Cassette Cover, Tape Cassette, and Dry Cells........................................ III-2
[ 2 ] Removing the Cutter Case ASSY and Board,
and Separating the Bottom Cover and the Upper Cover ................................................ III-4
[ 3 ] Removing the Terminal Press Cover and the - Terminal ASSY.................................... III-6
[ 4 ] Removing the + Terminal ASSY ................................................................................... III-8
[ 5 ] Removing the Cutter Lever, the Cutter Lever Spring,
the Roller Holder ASSY and the Roller Holder Release Spring .................................... III-9
[ 6 ] Removing the Head ASSY........................................................................................... III-10
[ 7 ] Removing the Gears ..................................................................................................... III-11
[ 8 ] Removing the Motor Holder and DC Motor ASSY..................................................... III-12
[ 9 ] Removing the Ribbon Drive Cam, the Ribbon Drive Gear
and the Ribbon Clutch Spring ...................................................................................... III-13
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