Sharp AR-BC260 Service Manual page 96

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
Color Item
K A: HIGH SPEED High speed (117mm/s) (B & W)
B: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)
C: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper)
C A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)
B: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper)
M A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)
B: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper)
Y A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)
B: LOW SPEED Low speed (58.5mm/s) (Color) (B & W)
(Special paper)
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.
B
Operation mode
Adjustment
0 – 585
0 – 585
0 – 585
0 – 585
0 – 585
0 – 585
0 – 585
0 – 585
0 – 585
A
AR-BC260 SETTING AND ADJUSTMENTS 8 - 3
ADJ 1B DV bias voltage adjustment
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.
Adjustment value
Monitor (High voltage PWB)
Specified
Monitor voltage
value
range (Specified value)
(Default)
215 3.94 ± 0.1V
215 3.94 ± 0.1V
215 3.94 ± 0.1V
265 5.76 ± 0.1V
265 5.76 ± 0.1V
265 5.76 ± 0.1V
265 5.76 ± 0.1V
240 4.75 ± 0.1V
240 4.75 ± 0.1V
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.
Developing bias voltage
Pin Actual
No. voltage
Connector
CNMONK 3 –215v
CNMONK 3 –215v
CNMONK 3 –215v
CNMON 1 –265v
CNMON 1 –265v
CNMON 5 –265v
CNMON 5 –265v
CNMON 9 –240v
CNMON 9 –240v