![background image](http://html1.mh-extra.com/html/ricoh/fax3700l/fax3700l_service-manual_1456522054.webp)
Bias Control Circuit
The cpu controls the voltages to the toner application and development roll-
ers using the Bias 0 and Bias 1 signals as shown in the following table.
In
Bias 0
Low
High
Low
High
Bias 1
Low
Low
High
High
Out
Toner Application
Roller
- 700 V
- 50 V
Off
Off
Development Roller
-400 V
+ 250 V
-400 V
Off
FDU
FCE
CPU
1-44
1-45
1-83
1-87
Power
Pack
Driver
Bias 0
Bias 1
Transfer 0
Transfer 1
Power
Pack
Toner Application
Roller
Development
Roller
Transfer Roller
IC4
21-6
21-7
21-4
21-5
H516D552.wmf
August 2nd,1995
DETAILED SECTION DESCRIPTIONS
PRINTING
2-25