MX-M850 (serv.man36). Section 6 Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 3

MX-M1100  ADJUSTMENTS  6 – 3

 

(Note)
To check and adjust the output voltage, use the unit which can
measure an effective value of 1000M

Ω or more internal imped-

ance.  In addition, use a high voltage probe as well. 
(FLUKE87FLUKE80K-40 is recommended.) 

 

This adjustment is needed in the following situations:
* When the high voltage MAIN PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)

Enter the Sim. 8-2 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 main charger voltage is outputted.
When the output voltage must be checked or adjusted, follow the
procedure below:
1)

Remove the upper rear cover of the machine

2)

Attach the digital multi-meter between the connector CN2 pin
(3) on the high voltage main PWB and GND.

3)

Enter the adjustment value with 10-key, and press [EXECUTE]
key.
The main charger voltage is outputted for 10sec.
Note:
Perform this procedure timely as extended charge output will
stress the photoconductor.

A㧦580

㧧

COPY

B㧦580

㧧

PRINTER

C㧦580

㧧

FAX

0

A:

SIMULATION NO.08㧙02

MHV/GRID SETTING AND OUTPUT

580

㨇

200 㨪1000 㨉

OK

TEST

EXECUTE

CLOSE

A

COPY

Main charger grid voltage adjustment value 
(Copy mode)

200-1000

560

580

CN2

3

-590 

± 1 V

-610 

± 1 V

B

PRINTER

Main charger grid voltage adjustment value 
(Priner mode)

200-1000

560

580

CN2

3

-590 

± 1 V

-610 

± 1 V

C

FAX

Main charger grid voltage adjustment value 
(FAX mode)

200-1000

560

580

CN2

3

-590 

± 1 V

-610 

± 1 V

CN2