Pre-Cleaning Corona - Ricoh FT7060 Field Service Manual

64. Pre-cleaning Corona

OPTIMUM VALUE: 29.0 to 30.0 µA, -15.5 to -17.0 µA
NOTE: Adjust the ac discharge first and then adjust the dc discharge. It is
usually necessary to repeat this adjustment two or three times, because ad-
justment of the dc component will cause a slight change in the ac component
and vice versa.
CAUTION: When changing the range of the digital multimeter, make sure the main switch
is turned off.
1. Position the drum shoe [A] in the center and align it with the PCC
corona unit [B] as shown.
Select the ac µA range on the digital multimeter.
2.
3. Turn on the main switch and the PCC corona using SP 11-2.
4. Adjust the PCC corona current by turning VR "PCC:AC" [C] on the
charge/PCC power pack.
5. Turn off the copier's main switch and select the dc µA range on the
digital multimeter.
6. Turn on the main switch and the PCC corona.
7. Adjust the PCC corona dc current by turning VR "PCC:DC" [D].
8. Remove the drum shoe and reinstall all parts.
9. Check copy quality and paper separation.
(Let the reading stabilize for 10 seconds.)
3-85
12 July '86