2-11
EO18-33006
2. MAJOR UNIT REPLACEMENT
Sensor Adjustment
After replacing the I/O PC board or changing ribbon type, be sure to adjust the sensors in the following
procedure.
Ribbon End Sensor
1) Set the ribbon so that the ribbon end sensor can detect the ribbon. Then turn on the power.
NOTE: Use TOSHIBA TEC-approved ribbon (TTP-110).
2) Measure the voltage between TPRETR pin on the I/O PC board and the printer inner plate (GND)
with a oscilloscope, and adjust the voltage to 3.0
–
0.2V by turning VR1 on the I/O PC board.
3) Set the ribbon end portion (not ink portion) so that the ribbon end sensor can detect it. Measure the
voltage again. If it is over 0.4V, re-adjust the voltage from step (2) again.
4) After the adjustment is successfully made, turn off the printer and reassemble the left side cover.
2.9 REPLACING THE I/O PC BOARD
Black Mark Sensor
Refer to the adjustment procedure for the black mark sensor (Section 6.5.2) which is adjusted by key
entries in system mode.
Feed Gap Sensor
Refer to the adjustment procedure for the feed gap sensor (Section 6.5.3) which is adjusted by key
entries in system mode.
I/O PC Board (Parts Side)
Fig. 2-18
VR1
TPRETR Pin