Canon GP405 Service Manual page 135
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6. Correcting the Application Voltage Level (APVC control)
The primary charging efficiency varies according to changes in the site environment
(temperature, humidity) and deterioration of the charging roller. A reference current is applied
when the main power switch is turned on to find out the degree of voltage output for correction a
follows:
A reference voltage is applied during initial rotation after main power switch is turned on.
The current output is measured, and communicated to the PW-CPU of the composite power
supply PCB.
The PW-CPU computes the optimum application voltage.
Primary charging is initiated using the optimum application voltage.
7. Controlling the Output Mode
To prevent stray toner in non-image areas in continuous copying, both AC bias and DC bias
outputs are varied between image areas and non-image areas.
Related Service Mode
ADJUST>HV-PR1>P-DC
ADJUST>HV-PR1>P-NO-DC
ADJUST>HV-PR1>P-AC
ADJUST>HV-PR1>P-NO-AC
Be sure to enter the value indicated on the service label if you have replaced the image
processor PCB or initialized the RAM.
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
DC bias output for image areas.
DC bias output for non-image areas.
AC bias output for image areas.
AC bias output for non-image areas.
6-7
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