Separation Corona - Ricoh FT7770 Service Manual

5. Separation Corona

OPTIMUM VALUE:
NOTE: Adjust the ac current
necessary to repeat this adjustment two or three times, because adjustment of
the dc component slightly changes the ac component and vice versa.
CAUTION:
Turn off the main switch before changing the range of the digital multimeter.
Align the drum shoe [A] in the center and align it with the separation
1.
corona unit [B] as shown.
2. Select the ac µA range on the digital multimeter.
3. Turn on the main switch and the separation corona using (SP 12-2: Dl,
12-3: D2, and 12-4: D3).
4. Adjust the separation corona current by turning VR "D1(AC)" on the
transfer/separation power pack [C].
seconds.)
5. Repeat the above procedure for D2 and D3.
6. Turn off the copier's main switch and select the dc µA range on the
digital multimeter.
7.
Turn on the main switch and the separation corona.
8. Remove the drum shoe and reinstall all parts.
9. Check copy quality and paper separation.
ac = 45.0±2.0µA
Dl
dc = -3.0±0.5µA
45.0±2.0µA
D 2 a c =
-2.0±0.5µA
dc =
and then adjust the dc current, It is usually
first
5-83
D3 ac = 45.0±2.0µA
dc = -5.7±0.5µA
(Let the reading stabilize for 10
30 April, '89