Ricoh FT5580 Service Manual page 116

Pre-Quenching Corona
Optimum Adjusting Value: DC +17.0 ± 2.0 µA
1 . D i s c o n n e c t t h e c o n n e c t o r o f t h e c l e a n i n g b i a s r o l l e r a t t h e p o w e r
p a c k a s t h e o n t i m i n g o f t h e c l e a n i n g b i a s r o l l e r a n d t h e p r e -
quenching corona are the same.
2. Reinstall the PQC unit, and position the drum shoe so that the axis of
the current sensing plate [A] is aligned with the PQC wire [B].
3. Select the dc 200 µA range of the digital multimeter.
4. Turn on the DIP switch on the switching PCB corresponding to "PQC"
on the TC/SC power pack PCB to turn on the PQC. (The silk screen
printed on the TC/SC power pack PCB is correct.)
5. Adjust the corona current by turning VR "PQC" [C] on the PQC/CB
power pack. (Wait 30 seconds for the current to stabilize.)
6. Remove the drum shoe, and reassemble.
7. Check copy quality.
3-65
12 June 1987