Separation Corona - Ricoh FT5580 Service Manual

Separation Corona

Optimum Adjusting Values:
A C 5 7 . 0 ± 2 . 0 µ A ( D 1 )
DC -8.0 ± 1.0 µA (leading edge: D1)
DC -2.5 ± 1.0 µA (normal: D1 & D2)
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.
Turn on the DIP switch on the switching PCB corresponding to "D1"
o n t h e T C / S C p o w e r p a c k P C B t o t u r n o n t h e s e p a r a t i o n c o r o n a .
(The silk screen printed on the TC/SC power pack PCB is correct.)
4. A d j u s t t h e c o r o n a c u r r e n t b y t u r n i n g V R " D A C " [ C ] o n t h e T C / S C
power pack. (Wait 30 seconds for the current to stabilize.)
Leading edge dc: D1
5 . T u r n o f f t h e m a i n s w i t c h , a n d s e l e c t t h e d c 2 0 0 µ A r a n g e o n t h e
digital multimeter.
6. Turn on the main switch, and adjust the corona current by turning VR
" D C 1 " [ D ] o n t h e T C / S C p o w e r p a c k .
current to stabilize.)
Normal dc
7. Turn on the DIP switches on the switching PCB corresponding to "D1
& D 2 " o n t h e T C / S C p o w e r p a c k P C B t o t u r n o n t h e s e p a r a t i o n
corona.
(The silk screen printed on the TC/SC power pack PCB is
correct.)
8 . A d j u s t t h e c o r o n a c u r r e n t b y t u r n i n g V R " D C 2 " [ E ] o n t h e T C / S C
power pack. (Wait 30 seconds for the current to stabilize.)
9. Remove the drum shoe, and reassemble.
10. Check copy quality.
( W a i t 3 0 s e c o n d s f o r t h e
3-63
12 June 1987