Ricoh FT7770 Service Manual page 372

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13. Registration
Sensor Level Adjustment
1.
Make a solid copy [A] and place it under the registration
2.
Check the voltage between
3.
Adjust the voltage with VR104 so that it is between 9 volts and 10
volts.
4.
Remove the solid copy and make sure the voltage is less than 3 volts.
replace the
(If not,
TP101 (GND)
registration
sensor or the
7-53
sensor [B].
TP105
and
on the
DF main
board. )
30
April; '89
DF
main board.

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