Read Sharp AR-405 (serv.man9) Service Manual online
(3) Developing bias voltage adjustment
1) Set the digital multi-meter range to the DCV range.
2) Put the test probes between the DV bias output check pin (CN2-1
pin) of the high voltage unit and the chassis (GND).
3) Execute SIM 8-1.
The DV bias can be measured without installing the OPC drum
and the developing unit.
and the developing unit.
4) When the output voltage is within the adjustment range, change
the displayed value and adjust. (1 step: about 1 V)
Adjustment range
Developing negative bias voltage (Auto)
–500
±
5V
Developing negative bias voltage
(Character)
(Character)
–500
±
5V
Developing negative bias voltage
(Character, Photo)
(Character, Photo)
–500
±
5V
Developing negative bias voltage (Photo)
–500
±
5V
Developing negative bias voltage (FAX)
–500
±
5V
Developing bias (Printer)
–500
±
5V
Developing positive bias voltage
+150
±
5V
(The value and the output voltage may not coincide.)
(4) Main charger grid voltage adjustment
1) Install the DV unit, the drum holder unit, and the charger units to
the copier.
2) Turn on the main switch, and execute SIM 8-2 to check the grid
voltage set value.
(Measurement at the high voltage PWB check point)
3) Remove the rear cabinet.
4) Connect the digital multi-meter to the grid voltage output check pin
(CN2-5 pin).
5) Set the digital multi-meter range to the DCV range.
(Use a digital multi-meter which allows measurement up to
DC1000 V.)
DC1000 V.)
6) Manually turn on the door switch.
7) Turn on the main switch, and execute SIM 8-2 to check.
8) If the output voltage is not in the specified range, change the
displayed value and adjust. (1 step: about 1V)
Adjustment range
AR-2XX/3XX
series
AR-405
Grid voltage (Auto)
–642
±
5V
–602
±
5V
Grid voltage (Character)
–642
±
5V
–602
±
5V
Grid voltage (Character, Photo)
–642
±
5V
–602
±
5V
Grid voltage (Photo)
–642
±
5V
–602
±
5V
Grid voltage (Printer)
–642
±
5V
–602
±
5V
Grid voltage (FAX)
–642
±
5V
–602
±
5V
(The value and the output may not coincide.)
AR-405
7 – 3
1/21/1999
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