Sharp AR-BC320, Service Manual, Page: 110 / 344

AR-BC320 SETTING AND ADJUSTMENTS 8 - 3
8) Press the [EXECUTE] key.
The main charger grid voltage is outputted for 30sec.
If this operation is performed for a long time, the OPC drum
and the developing roller may be damaged. Be careful to per-
form this operation in a short time.
It is advisable to install an unnecessary developing unit and
unnecessary OPC drums to the machine for this adjustment.
9) Check the monitor voltage with the digital multi-meter.
If the monitor voltage is not in the above specified range,
change the adjustment value and adjust again. If the specified
voltage is not obtained even by changing the adjustment
value, the following parts may be judged as defective.
High voltage PWB
PCU PWB
Developing unit
Photoconductor unit
High voltage circuit electrode
This adjustment must be performed in the following cases:
• When the high voltage power PWB is replaced.
• When a U2 trouble occurs.
• When the PCU PWB is replaced.
• When the EEPROM of the PCU PWB is replaced.
1) Enter the SIM 8-1 mode.
SIM 8-1
2) Select the output mode to be adjusted with the color key and
the scroll key.
3) Enter the adjustment value (specified value), and press the
[OK] key.
By entering the default value (specified value), the specified
voltage is outputted.
Remark: When the default value is set, the specified voltage is
outputted.
There is, therefore, no need to check the output voltage
unless there is a doubt for any abnormality in the output
voltage.
If there is a need to check that the normal voltage is out-
putted or to adjust by referring to the output voltage, use
the method below.
1) Remove the rear cover of the machine.
2) Remove the image process fan motor and the duct.
3) Connect the high voltage adjustment harnesses (DHAi-
3471FCZZ/DHAi-3472FCZZ) with the connectors CNMON
and CNMONK on the high voltage PWB.
4) Enter the SIM8-2 mode.
5) Select the output mode to be adjusted with the color key and
the scroll key.
6) Check that the pin numbers of the connectors CNMON and
CNMONK are properly assigned to the connector pin numbers
of the high voltage adjustment harness.
ADJ 1B DV bias voltage adjustment
Color Item Operation mode
Adjustment value
Developing bias voltage
Monitor (High voltage PWB)
Pin
No.
Actual
voltage
Adjustment
range
Specified
value
(Default)
Monitor voltage
(Specified
value)
Connector
K A: HIGH SPEED High speed (140mm/s) (B & W) 0 – 585 215 3.94 ± 0.1V CNMONK 3 – 215v
B: MIDDLE SPEED Middle speed (117mm/s) (Color) (B & W) 0 – 585 215 3.94 ± 0.1V CNMONK 3 – 215v
C: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper) 0 – 585 185 3.46 ± 0.1V CNMONK 3 – 185v
C A: MIDDLE SPEED Middle speed (117mm/s) (Color) (B & W) 0 – 585 265 5.76 ± 0.1V CNMON 1 – 265v
B: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper) 0 – 585 235 4.75 ± 0.1V CNMON 1 – 235v
M A: MIDDLE SPEED Middle speed (117mm/s) (Color) (B & W) 0 – 585 265 5.76 ± 0.1V CNMON 5 – 265v
B: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper) 0 – 585 235 4.75 ± 0.1V CNMON 5 – 235v
Y A: MIDDLE SPEED Middle speed (117mm/s) (Color) (B & W) 0 – 585 240 4.75 ± 0.1V CNMON 9 – 240v
B: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper) 0 – 585 210 3.78 ± 0.1V CNMON 9 – 210v
A
B