Separation Corona Current Adjustment - Ricoh FT5540 Service Manual

8.9 Separation Corona Current Adjustment

Optimum Adjusting Values:
AC 57.0
DC -8.0
DC -2.5
1. Reinstall the TC/SC corona 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 separation corona wires [B]
as shown.
AC current: D1
2. Select the ac 200 µA range on the digital multimeter.
3. To turn on the separation corona, turn on the D1 DIP switch on the switching PCB (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 "DAC" [C] on the TC/SC power pack. (Wait 30
seconds for the current to stabilize.)
+ 2.0 µA (D1)
+ 1.0 µA (leading edge: D1)
+ 1.0 µA (normal: D1 & D2)
5-69
31 August 1989