MX-M850 (serv.man36). Section 6 Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 7

MX-M1100  ADJUSTMENTS  6 – 7

 

This adjustment is needed in the following situations:
* When the photoconductor drum is replaced.
* When the front surface potential sensor is replaced.
* When the main charger unit is replaced.
* When the main high voltage PWB is replaced.
* When the photoconductor unit (process unit) is disassembled.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
* Before executing the image adjustment
1)

Enter the Sim.44-3 mode. 

2)

Select the adjustment mode.
• INI DARK VO:

When the OPC drum is replaced, select this mode.

• DARK VO: 

In the other cases, select this mode.

3)

Press [EXECUTE] key.
[EXECUTE] button is highlighted, and the OPC drum is rotated
to start the OPC drum dark potential adjustment operation.
After completion of the adjustment, [EXECUTE] button returns
to the normal display.
The main charger grid voltage is automatically corrected until
the OPC drum dark potential becomes the specified value.

 

 

The check and the adjustment are required in the following cases:
* When the developing unit is disassembled.
* When the print image density is too low.
* When there is a thin spot on a print image.
* When the print image density is uneven.
* When there is abnormally much toner dispersion.

1)

Remove the developing unit from the machine, and remove
the cover and the guide as shown in the figure below.

0

SIMULATION NO.44̆03

TEST

DARK POTENTIAL ADJUSTMENT

EXECUTE

INI TUM AREA

8

:

INI HUM AREA

7

: 

VGL K

LIFE COUNTER

0

:

TARGET VO

650

:

1/1

CLOSE

VO RESULT

650

:

INI DARK VO

DARK VO

GRID BIAS

750

:

INI VG1

0

:

INI VG2

0

:

VG ENV

0

:

VG LIFE

0

:

LIFE K

1

:

1

:

VGH K

1

:

LOW VO

 

0

:

HIGH VO

0

: