Canon imagePRESS C1 P Service Manual page 367

Chapter 7
UN-5
J1407
J556
HUM1
[1] Primary Transfer Roller
[2] Secondary Transfer Inside Roller
[3] Secondary Transfer Outside Roller
DC-CON: DC Controller
HUM1: Environment Sensor
UN5: Pickup Driver PCB
1. Primary Transfer ATVC
The primary transfer ATVC determines the primary transfer voltage in order to obtain the target transfer current at the time of the transfer.
The primary transfer ATVC control has the following two control types: the full ATVC control executed by facing the developing assembly of each color to the
drum (considering the drum potential variation, and the state with the influence of the developing bias), and the partial potential control executed without facing
the developing assembly to the drum (the state without the influence of the developing bias).
a. Startup Condition
Full Potential Control
- At the warm-up rotation after the power is ON.
- When executing the PASCAL control.
- At the last rotation after passing 500 sheets.
Partial Potential Control
- At the warm-up rotation.
b. Description
Sequence Operation
1 Apply the constant current
7-18
ENV_TEMP
J1189
J202
J203
J3050
HVT2
[2]
Description
By applying the constant current to the primary transfer roller, feedback the voltage data of the primary transfer
roller to the DC controller.
DC-CON
HV2-SUB
[1]
[3]
F-7-19
T-7-8
J1188
J201
J205
J3150
HVT4