Ricoh FT5580 Service Manual page 115

12 June 1987
Pre-Cleaning Corona
Optimum Adjusting Values:
A C 4 6 . 0 ± 2 . 0 µ A
DC -24 ± 1.0 µA
1.
Reinstall the cleaning unit, and position the drum shoe at the center
o f t h e s h a f t s o t h a t t h e a x i s o f t h e c u r r e n t s e n s i n g p l a t e [ A ] i s
aligned with the PCC wire [B].
2.
Select the ac 200 µA range of the digital multimeter.
3. Turn on the DIP switch on the switching PCB corresponding to "PCC"
on the TC/SC power pack PCB to turn on the PCC. (The silk screen
printed on the TC/SC power pack PCB is correct.)
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.
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