Bias Circuit - Ricoh FT7770 Service Manual

30 April, '89

Bias Circuit

8.
Image density is controlled by varying the development bias.
pack changes
the
the bias thermistor.
Output level controlled by the main board
The board commands the power pack to change the output level by six bits
main
(B0 to B4 and BP).
tabulated on the next page:
controlled by the main board is the sum of
output level according to the data from the main board
The status of each bit and the corresponding output are
The output level from the bias power pack
O1,O2,
and O3.
2-38
The bias power
and