Developing Bias Adjustment; Notes On Installing Various Rollers Of The Developing Unit; Notes On Applying The Developing Side Seals (Front And Rear) - Sharp SF-2040 Service Manual

(3) Developing Bias Adjustment

1 Set the measuring range of the digital multimeter to 300 Vdc or
more.
2 Apply the probes to the developing bias output check pin (CP-B)
and the chassis(GND) of the high voltage unit.
3 Perform Simulation 8-1. (The developing bias voltage is output
for 30 seconds.
4 Adjust VR301 for developing bias control so that the output
voltage is –300±10V.
(4) Notes on installing various rollers of the
developing unit
(1) V-rings must be attached in the correct direction.
(2) No gap must exist at between the V-ring and the roller.
(3) When attaching φ8-ring PRNGP0013FCZZ, φ8-ring
PRNGP0022FCZZ and φ6-ring PRNGP0015FCZZ to the
developing magnet roller,
1) the direction of the V-ring must be as shown in the upper
figure.
2) no gap must exist at
(5) Notes on applying the developing side seals
(front and rear)
(1) The side seal must be applied on a surface which is free of oil,
grease and foreign matter.
(2) The side seal must be securely attached to prevent it from
coming off.
D
Rear
between the V-ring and the roller.
V-ring Φ8
Rear
V-ring Φ6
Rear
V-ring Φ6
Rear
C
B
Front
Rear
7 – 2
V-ring Φ8
Magnet roller
V-ring Φ6
Front
Roller S (X2)
V-ring Φ6
Roller MX
Front
Front
A
Front