Ricoh FW830, Service Manual

Page: 158 / 227

4.3.2 Charge Corona Current Adjustment
ADJUSTMENT STANDARD Adjusting VR
DC 1.1
±
0.01 mA
VR101
1. Turn off the main switch.
2. Disconnect the Charge/Grid/Bias power pack connector [A] from the
charge corona terminal [B].
3. Select the dc 2 mA range on the digital multimeter.
4. Connect the multimeter leads as shown.
5. Turn on the main switch.
6. Turn on DPS101-7 and 101-8 on the main board to enter the output
check mode.
7. Enter output check No 24. (See output Check Mode Access Procedure.)
8. Press the Copy Exit Way key to turn on the charge corona.
9. Enter output check No 34.
10. Press the Plus (+) key until "8" is displayed in the Copy Counter indicator.
Then, press the Copy Exit Way key to apply the grid voltage (–940 volts).
11. Adjust the charge corona current to 1.1
±
0.01 mA by turning VR101 on
the Charge/Grid/Bias power pack [C].
12. Turn off DPS101-7, 101-8 and the main switch.
[A]
[B]
[C]
VR101
CORONA 31 December 1992
5-18