
Appendix D-8
Product Overview
Rev. A
Confidential
Home position detection mechanism
The home position detection mechanism is located at the left end of the head carriage assembly.
This mechanism keeps track of the head carriage assembly movement position. The initial
settings are made by detecting the detection plate at the rear of the head carriage assembly.
The home position detector consists of an LED and photo IC. When the head carriage assembly
is moved, the detection plate passes between the LED and photo IC. The photo IC output level
changes when the light rays are interrupted. This change in output level is used as a detection
signal for the head carriage movement position.
Figure D-10
Carriage detection mechanism
The carriage detection mechanism uses a rotary encoder interlocked to the carriage motor gear
to detect abnormal carriage motor rotation.
This mechanism is comprised of the carriage drive transmission gear and carriage detector,
which are located on the carriage motor shaft.
The carriage detector consists of an LED and photo transistor.
The driving force generated by the carriage motor is transmitted to the carriage motor gear,
carriage drive pulley, carriage belt, carriage transmission pulley, and the carriage drive
transmission gear, which is located at an equal interval on the inside of the gear, where the
screening plate is located. When the carriage drive transmission gear is rotated by the driving
force of the carriage motor, the screening plate passes between the LED and photo transistor.
The output level of the photo transistor changes at this time, since the light rays are interrupted.
This output level is used as the detection signal for carriage motor rotation.
Figure D-11
GND
High
+5V
GND
Low
When light is
interrupted
When light is emitted
Printer side
head carriage detector assembly
Signal level at point A
GND
High
+5V
GND
Low
When light is
interrupted
When light is emitted
Printer side
Screening plate
Signal level at point A
Summary of Contents for TM-H6000
Page 1: ...Confidential Service manual TM H6000 H6000P English 401040800 Issued Date 199 Issued by ...
Page 29: ...1 20 Troubleshooting Rev A Confidential ...
Page 69: ...Disassembly and Assembly 2 40 Rev A Confidential ...
Page 81: ...3 12 Adjusting Rev A Confidential ...
Page 83: ...Appendix A 2 Service Tools and Lubricants Rev A Confidential ...
Page 87: ...Appendix B 4 Maintenance Rev A Confidential ...
Page 225: ...I 10 Printer Handling Rev A Confidential ...
Page 227: ...Appendix J 2 Screw Types Rev A Confidential ...
Page 229: ...K 2 Parts Layout Rev A Confidential Main Circuit Board Unit solder side memory board ...