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

MX-M1100  ADJUSTMENTS  6 – 6

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 has
saved and the transfer cleaning voltage is outputted.
The three items of this adjustment are of the AC component
and the DC component of the transfer belt cleaning mode volt-
age applied to the transfer roller, and the actual output voltage
cannot be checked. 
Therefore, if the voltage is presumed to be abnormal even
though the adjustment value is set to the default value, replace
the high voltage main PWB. 

 

This adjustment is needed in the following situations:
* The high voltage SUB 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.8-18 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 transfer cleaning brush voltage is outputted
simultaneously.

Use the following procedures to check whether the normal voltage
is actually outputted or to perform the adjustment while checking
the output voltage. 
1)

Remove the upper rear cover of the machine.

2)

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

3)

Enter the adjustment value with 10-key, and press [EXECUTE]
key.
The transfer cleaning brush voltage is outputted for 30 sec. 

4)

Check the output voltage with the digital multi-meter. 
If the output voltage is not in the range specified in the above
table, repeat the procedures 2 thru 4 until it is in the specified
range. 

A㧦 23

㧧

THVCL+

B㧦 50

㧧

THVCĹ

0

A:

SIMULATION NO.08㧙18

THVCL SETTING AND OUTPUT

23

㨇

0 㨪 150㨉

OK

TEST

CLOSE

EXECUTE

A

THVCL+

Output for the transfer belt cleaning 
brush

Print mode

10-150

23

CN2

1

0.36 – 0.49V

200 

± 25V

B

THVCL-

Cleaning mode

30-150

50

CN2

1

1.01 – 1.14V

-500 

± 25V

CN2