Brother QL-700, Service Manual

Page: 3 / 107

CONTENTS
CHAPTER I SPECIFICATIONS...............................................I-1
1.1 MECHANICAL SPECIFICATIONS ........................................................................................I-1
1.1.1 External Appearance ...........................................................................................................I-1
1.1.2 Control Button and LED .....................................................................................................I-1
1.1.3 Display.................................................................................................................................I-2
1.1.4 Printing Mechanism.............................................................................................................I-2
1.1.5 Thermal Tape.......................................................................................................................I-3
1.1.6 Cutter ...................................................................................................................................I-4
1.1.7 PC Interface .........................................................................................................................I-4
1.2 ELECTRONICS SPECIFICATIONS .......................................................................................I-4
1.2.1 Character Generator.............................................................................................................I-4
1.2.2 Power Supply.......................................................................................................................I-4
CHAPTER II THEORY OF OPERATION.............................. II-1
2.1 OUTLINE OF MECHANISMS .............................................................................................. II-1
2.1.1 Print Mechanism................................................................................................................ II-1
2.1.2 Press Contact and Release Mechanism of Thermal Head ................................................. II-2
2.1.3 Tape Feed Mechanism....................................................................................................... II-3
2.1.4 Automatic Tape Full Cutter Mechanism ........................................................................... II-4
2.1.5 Cover Open (Cover Lock) Sensor (Push Switch).............................................................. II-5
2.2 OUTLINE OF CONTROL ELECTRONICS .......................................................................... II-6
2.2.1 Main PCB ASSY ............................................................................................................... II-6
2.2.2 Media Type Detect Switch PCB (Media PCB ASSY) ...................................................... II-6
2.2.3 Media Position Detect Sensor PCB (Tape Sensor PCB ASSY)........................................ II-6
2.2.4 Button, LED PCB (SB PCB ASSY).................................................................................. II-6
2.2.5 Cutter Sensor (Cutter Home Position Detect Sensor) ....................................................... II-7
2.2.6 Media Feed Motor (Tape Feed Motor ASSY) .................................................................. II-7
2.2.7 Full Cutter Motor (Cutter Motor ASSY)........................................................................... II-7
2.2.8 Thermal Head .................................................................................................................... II-7
2.3 MAIN PCB .............................................................................................................................. II-8
2.3.1 Media Type Detect Sensor Circuit, Media Position Detect Sensor Circuit and
Cover Open Sensor Circuit................................................................................................ II-9
CHAPTER III DISASSEMBLY AND REASSEMBLY ...........III-1
3.1 SAFETY PRECAUTIONS..................................................................................................... III-1
3.2 TIGHTNING TORQUE LISTS ............................................................................................. III-2
3.3 LUBRICATION POINTS LIST............................................................................................. III-3
3.4 DISASSEMBLY PROCEDURE............................................................................................ III-5
[1] Removing the Thermal Tape and the Top Cover ASSY................................................ III-5
[2] Removing the Power Supply ASSY and the Main PCB ASSY..................................... III-8
[3] Removing the Sub ASSY Inlet..................................................................................... III-12
[4] Removing the Media PCB ASSY ................................................................................ III-13
[5] Removing the Panel Cover........................................................................................... III-14