Developing Bias Control; Outline; Operation - Canon GP160F Service Manual

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V. DEVELOPING BIAS CONTROL
A.

Outline

The circuit shown in Figure 6-501 is the circuit which controls the developing bias in
the DC controller PCB. It's principal functions are as follows:
• Developing bias AC ON/OFF control
• Developing bias DC ON/OFF control
• Developing bias DC constant voltage control
B.

Operation

The developing bias control is performed by the DC ON/OFF signal (DVDUP) and
the AC ON/OFF signal (DVACON), which are output from the DC controller PCB's CPU
(IC 301).
When DVDUP*=0 is output from the CPU, developing bias DC is applied by power
being supplied to the DC bias generation circuit,. And, when the DVACON signal is out-
put from the CPU, AC bias is generated.
Due to the CPU outputting these signals at designated times, developing bias is gen-
erated and applied to the developing cylinder.
Furthermore the output voltage from the DC bias generation circuit undergoes con-
stant voltage control by being returned to the comparison circuit.
Photo-
sensitive
drum
[1] DVACON: AC bias drive signal
[2] DVDUP: DC ON/OFF signal
COPYRIGHT © 1999 CANON INC.
Download Free Service Manual at http://printer1.blogspot.com
JH402
Bias drive
circuit
DC bias
generation
circuit
Figure 6-501
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
AC bias
generation
circuit
+24V
Compara-
tive circuit
DC bias
detection circuit
DC controller PCB
[1] DVACON
CPU
(IC301)
[2] DVDUP
6-7

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