Read Sharp MX-M850 (serv.man36) Service Manual online
MX-M1100 ADJUSTMENTS 6 – 4
4)
Check the output voltage with the digital multi-meter.
If the output voltage is outside the specified range described in
the above table, perform procedures 2 thru 4 until the specified
value is reached.
NOTE:
If the specified voltage is not obtained by changing the adjust-
ment value, one of the following parts may be defective.
• High voltage MAIN PWB
• PCU PWB
• OPC drum unit
• High voltage circuit electrode
If the output voltage is outside the specified range described in
the above table, perform procedures 2 thru 4 until the specified
value is reached.
NOTE:
If the specified voltage is not obtained by changing the adjust-
ment value, one of the following parts may be defective.
• High voltage MAIN PWB
• PCU PWB
• OPC drum unit
• High voltage circuit electrode
1-B
Developing bias voltage adjustment
This adjustment is needed in the following situations:
* The high voltage MAIN PWB has been replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
* The high voltage MAIN PWB has been replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
Enter the Sim. 8-1 mode. .
2)
Select the output mode to be adjusted with the scroll button.
3)
Enter the adjustment value with 10-key, and press [OK] button.
The adjustment value is set.
Normally when the default value is set, the specified voltage is
outputted.
When [EXECUTE] button is pressed, the adjustment value is
saved and the developing bias voltage is outputted simulta-
neously.
The adjustment value is set.
Normally when the default value is set, the specified voltage is
outputted.
When [EXECUTE] button is pressed, the adjustment value is
saved and the developing bias voltage is outputted simulta-
neously.
When the output voltage must be checked to be normal or not or
when an adjustment is required while checking the output voltage,
follow the procedures below:
1)
when an adjustment is required while checking the output voltage,
follow the procedures below:
1)
Remove the upper rear cover of the machine
2)
Attach the digital multi-meter between the connector CN2 pin
(7) on the high voltage main PWB and GND.
(7) on the high voltage main PWB and GND.
3)
Enter the adjustment value with 10-key, and press [EXECUTE]
key.
The DV BIAS voltage is outputted for 30sec.
key.
The DV BIAS voltage is outputted for 30sec.
4)
Check the output voltage with the digital multi-meter.
If the output voltage is outside the specified range described in
the above table, perform procedures 2 thru 4 until the specified
value is reached.
NOTE:
If the specified voltage is not obtained by changing the adjust-
ment value, one of the following parts may be defective.
• High voltage MAIN PWB
• PCU PWB
• Development unit
• High voltage circuit electrode
If the output voltage is outside the specified range described in
the above table, perform procedures 2 thru 4 until the specified
value is reached.
NOTE:
If the specified voltage is not obtained by changing the adjust-
ment value, one of the following parts may be defective.
• High voltage MAIN PWB
• PCU PWB
• Development unit
• High voltage circuit electrode
A㧦495
㧧
COPY
B㧦495
㧧
PRINTER
C㧦495
㧧
FAX
D㧦150
㧧
PLUS
0
A:
SIMULATION NO.08㧙01
DV SETTING AND OUTPUT
495
㨇
0 㨪 750 㨉
OK
TEST
EXECUTE
CLOSE
Item/Display
Content
Setting range
Default
Monitor connector
Actual output
voltage
Connector
Pin No.
A
COPY
Developing bias adjustment value (Copy mode)
0-750
495
CN2
7
-500
± 1 V
B
PRINTER
Developing bias adjustment value (Printer mode)
0-750
495
CN2
7
-500
± 1 V
C
FAX
Developing bias adjustment value (FAX mode)
0-750
495
CN2
7
-500
± 1 V
D
PLUS
Reverse developing bias voltage
0-250
150
CN2
7
-150
± 1 V
CN2
Click on the first or last page to see other MX-M850 (serv.man36) service manuals if exist.