TEC B-670 Series Maintenance Manual page 7

2. MAJOR UNIT REPLACEMENT
4) Adjust the ribbon end sensor.
After replacing the CPU PC board or changing ribbon type, be sure to adjust the ribbon end sensor
in the following procedure with the ribbon being used.
NOTE: Use TOSHIBA TEC-approved ribbons.
Set the ribbon so that the ribbon end sensor
can detect the ribbon, Turn the power on.
Turn the VR1 so that the voltage between Pin
1 (GND) and Pin 7 of CN10 is 3.0 ± 0.2 V as
measured with an oscilloscope.
Turn the power off and mount the left side
cover and top cover.
VR1
5) Adjust the black mark sensor.
Refer to page 6-40 for the adjustment procedure for the black mark sensor which is adjusted by key
entries in system mode.
6) Adjust the feed gap sensor.
Refer to page 6-41 for the adjustment procedure for the feed gap sensor which is adjusted by key
entries in system mode.
CAUTION:
Be careful when replacing the CPU PC board, since a non-resettable counter (IC32) is installed on
thisboard. (Refer to Section 6.2.1 Maintenance Counter Printing.)If this counter should be reset,
replace IC32.
Fig. 2-3
Range : 1V / 0.2 m sec.
Voltage
3.0 0.2V
GND
2-3
EM18-33017
2.1 REPLACING THE CPU PC BOARD
Fig. 2-4