Charge Corona - Ricoh FT5580 Service Manual

Charge Corona

Optimum Adjustment Value: DC + 92.0 ± 1.0µA
CAUTION: Make sure that the main switch is turned off when you touch the drum
shoe.
1. Reinstall the drum stay (1 screw and 1 knob) and the charge corona
unit.
2. Position the drum shoe so that the axis of the current sensing plate
[A] is aligned with the charge corona 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 "C" on
the TC/SC power pack PCB to turn on the charge corona. (The silk
screen printed on the TC/SC power pack PCB is correct.)
5. Adjust the corona current by turning VR "C" [C] on the C/B power
pack. (Wait 30 seconds for the current to stabilize.)
6. C o n f i r m t h a t t h e c o r o n a c u r r e n t a t t h e f r o n t a n d t h e r e a r a r e t h e
s a m e b y r e p e a t i n g t h e a b o v e p r o c e d u r e w i t h t h e d r u m s h o e i n
different positions. If not, adjust the wire hight using the screw [D] on
the front end block.
7.
Remove the drum shoe, and reassemble.
8. Check copy quality.
3-61
12 June 1987