(Measurement at high-voltage PWB check point)
4
Remove the rear cabinet.
5
Connect the digital multimeter to the grid voltage output check pin
(CP-GB).
6
Set the digital multimeter for the DCV range. (Use a digital multi-
meter which allows measurement up to DC 1000V.)
7
Turn the door switch ON by hand.
8
Turn the main switch ON. Execute SIM 8-02 (select all modes
from auto mode to printer mode) to check the output voltage.
Main charger grid voltage in each mode
Output voltage
Auto
8-2
–490
±
5V
Manual
8-2
–490
±
5V
Photo
8-2
–490
±
5V
Soft-focus photo
8-2
–490
±
5V
Toner saving
8-2
–440
±
5V
Printer
8-2
–460
±
5V
9
If the output voltage is out of the specified range, adjust the output
voltage by changing the value being displayed (3 digits) (The
voltage varies 1 V for every 1 step.)
D. Adjusting separation charger output
This adjustment should be performed with the electrode sheet not
used.
1
Install both the DV unit and drum holder unit on the copier. Power
the copier ON.
2
Install both the separation charger unit and the drum holder unit
on the copier. All charger units should be installed on the copier.
3
Remove the rear cabinet.
4
Connect the digital multimeter to the SHVG output check pin
J501.
5
Set the digital multimeter for the DCV range.
6
Turn the door switch ON by hand.
7
Execute SIM 8-07. (SHVG turns on and stays on for about 30
seconds.)
8
During execution of the simulation, adjust the separation charger
output monitor voltage (bias voltage) for –400
±
10V with the
SHVG output adjustment knob VR-502.
(2) Precautions in maintaining high-voltage
charger unit
A. Main charger unit
1
Make sure the screen grid is free from twist, deformation or con-
tamination when installing it. Make sure it is securely settled in the
specified positioning groove.
J401
J401
J501
8 – 5