Toshiba B-570 - Manual (Page 6)

2-3
EM18-33010A 2. MAJOR UNIT REPLACEMENT
CAUTION:
Be careful when replacing the CPU PC board, since a non-resettable counter (IC12) is installed on
this board. (Refer to Section 6.2.1 Maintenance Counter Printing.)
If this counter should be reset, replace IC12.
Fig. 2-4
Fig. 2-5
2.1 REPLACING THE PS UNIT, I/F PC BOARD AND CPU PC BOARD
6) Adjust the ribbon end sensor.
Use the following Ribbons; TTM-78 (Maker: Fujicopian)
1 Set the ribbon so that the ribbon end sensor
can detect the ribbon. Turn the power on.
2 Turn the VR2 so that the voltage between Pin
1 (GND) and Pin 7 of CN10 is 3.0
±
0.2 V with
an oscilloscope.
3 Turn the power off and mount the left side
cover and top cover.
7) Adjust the black mark sensor.
As the black mark sensor is adjusted by key entries in system mode, refer to page 6-39 for the
adjustment procedure.
8) Adjust the feed gap sensor.
As the feed gap sensor is adjusted by key entries in system mode, refer to page 6-40 for the
adjustment procedure.
CN7
CN8
RA9
CN9
RA10
RA11
VR1 VR2
IC30
IC16
1 10
CN10
Range : 1V / 0.2 m sec.
Voltage
3.0 0.2V
VR2
GND