Pre-Cleaning Corona Current Adjustment - Ricoh FT5540 Service Manual

8.10 Pre-Cleaning Corona Current Adjustment

Optimum Adjusting Values:
AC 46.0
DC -24
1. Reinstall the cleaning unit, and position the drum shoe at the center of the shaft so that the
axis of the current sensing plate [A] is aligned with the PCC wire [B].
2. Select the ac 200 µA range on the digital multimeter.
3. To turn on the PCC, turn on the switching PCB dip switch corresponding to PCC on the
TC/SC power pack PCB. (The silk screen printed on the TC/SC power pack PCB is cor-
rect.)
4. Adjust the corona current by turning VR "AC" [C] on the PCC power pack. (Wait 30
seconds for the current to stabilize.)
5. Turn off the main switch, and select the dc 200 µA range on the digital multimeter.
6. Turn on the main switch, and adjust the corona current by turning VR "DC" [D] on the PCC
power pack. (Wait 30 seconds for the current to stabilize.)
7. Remove the drum shoe, and reassemble.
8. Check copy quality.
± 2.0 µA
± 1.0 µA
5-71
31 August 1989