Others; Transfer Charger Wire Installation; How To Adjust The Developing Bias Voltage - Sharp SF-1014 Service Manual

4. Others

(1) Transfer charger wire installation

Install the transfer charger wire as shown below. (Clean the charger
wire at every 40K copies and replace it at every 80K copies.)
Transfer charger unit (TC unit)
10 0.5
(Note for replacement of the charger wire)
a
Do not twist or deform the charger wire.
Charger wire
Improper
CORONA VOLTAGE IN THE EACH COPY MODE
COPY MODE
MAIN CORONA VOLTAGE
N.T.S NORMAL
AE
PHOTO
T.S NORMAL
AE
Charger wire Improper
MAIN CORONA UNIT
MAIN CORONA GRID
(V) VOLTAGE (V)
–5.3Kv
–5.3Kv
–5.3Kv
–5.3Kv
–5.3Kv
b
After replacement, be sure to clean the charger wire with alcohol.
(Be sure to use alcohol only.)
c
After wiping with alcohol, wipe with a dry cloth.
d
Use charger wire of 70µ (DWIR-0466CSZZ).
Tension spring
2~3mm
(2) How to adjust the separation corona voltage
1) Install the developer unit and OPC drum unit into the main body.
2) Set the hight voltage probe (1000:1) to digital multimeter.
3) Set the digital multimeter range to DC V.
4) Connect the digital multimeter to the SHVG check pin on the lower
unit control PWB and chassis GND.
5) Execute simulation 8-7 and adjust the separation corona voltage
to 3.5 ± 0.35v by rotates VR1 on the lower unit control PWB.
(SHVG turns on 30 sec)

(3) How to adjust the developing bias voltage

1) Install the developer unit and OPC drum unit into the main body.
2) Set the digital multimeter range to DC 500V.
3) Connect the digital multimeter to the developing bias output ter-
minal on the lower unit control PWB and chassis GND.
4) Execute simulation 8-1 and adjust the developing bias voltage to
–200 ± 3v by rotates VR2 on the lower unit control PWB.
(Developing bias turns on 30sec)
TRANSFER CORONA
VOLTAGE (V)
780 –5.3Kv
780 –5.3Kv
478 –5.3Kv
660 –5.3Kv
660 –5.3Kv
7 – 27
Cut the wire at the
root of the screw
Wind two turns and
tighten the screw
SEPAREATION CORONA
VOLTAGE (V)
+2.7Kv
+2.7Kv
+2.7Kv
+2.7Kv
+2.7Kv