Sharp SF-2040, Service Manual, Page: 88 / 131

E. Adjusting the Separation Charger Output
1 Attach the developing unit and the drum holder unit to the
machine and turn on the machine.
(Do not use the electrode sheet).
2
Attach the separation charger unit and drum holder unit to the
machine. The machine should have all the charger units in-
stalled.
3
Remove the rear cover.
4
Connect the digital multimeter to the SHVG output check pin
(BCDCCP).
5
Set the measuring range of the digital multimeter to DCV.
6
Turn on the door switch manually.
7
Perform Simulation "8-07". (The SHVG will go on for approx. 30
seconds).
8
During the simulation, adjust the SHVG output control VR502 so
that the output monitoring voltage (bias) BCDCCP of the separa-
tion charger is –100
±
10 Vdc.
(3) Notes on maintenance for high-voltage units
A. Electrostatic Charger Unit
1 Do not distort nor stain the screen grid during handling. Be sure
that the screen grid is secured in place.
2
The teeth of the saw-tooth assembly must be free of distortion.
3 Do not touch the inside of the MC case(saw-tooth assembly
side), the screen grid, and the saw-teeth.
4 The saw-teeth should be cleaned with polystyrene foam as
shown in the figure.
B. Transfer/Separation Charger Unit
1 The charger spring must be 11
±
0.5 mm in length.
2
The charger wire must be free of distortion and fitted in the
holder groove.
3
The charger case must be free of oil, grease and foreign matter.
4 The wire must be cleaned with alcohol.
11
0.5 mm
3~5mm
7 – 6