AR-M550 (serv.man14). (7) Settings and adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 4

AR-M550/M620  SETTING AND ADJUSTMENTS  7 - 4

4) Select the number that corresponds to the adjustment item using

the numeric keypad.

5) Press the Start key. 

6) Press the start key to have the voltage output for 30 seconds. 

The operation can be stopped with the CUSTOM SETTINGS key. 

If the output voltage is not within the requirement, do the following
steps. 

7) Enter the adjustment value using the numeric keypad. 

8) Press the Start key

(The adjustment value is put into memory, and the corresponding
voltage is output for 30 seconds.) 

Repeat steps 7 to 8 until the output requirement is satisfied.

This adjustment is needed in the following situations: 

• The high voltage power PWB (MC/DV/TC) has been replaced.

• U2 trouble has occurred. 

• The PCU PWB has been replaced.

• The EEPROM of the PCU PWB has been replaced. 

1) Go through the modes specified in Simulation 8-6.

2) Select the number that corresponds to the adjustment item

(FRONT/BACK) using the numeric keypad. 

3) Press the Start key

4) Enter the adjustment value (default) using the numeric keypad. 

5) Press the Start key

(The adjustment value is put into memory, and the corresponding
voltage is output for 30 seconds.) 

The operation can be stopped with the CUSTOM SETTINGS key.

Note: It is not possible to determine the adjusted transfer voltage

(print operation mode) (FRONT/BACK). If the voltage seems to
be abnormal after setting the default value, therefore, the high
voltage PWB (MC/DV/TC) should be replaced.

This adjustment is needed in the following situations: 

• The high voltage power PWB (MC/DV/TC) has been replaced.

• U2 trouble has occurred. 

• The PCU PWB has been replaced.

• The EEPROM of the PCU PWB has been replaced. 

1) Remove the rear cover of the machine. 

2) Apply a digital multi-meter to the connector CN2 pin (1) of the high

voltage PWB and the chassis GND. 

Item/operation 

mode

Simulation

Adjustment voltage 

(monitor voltage)

Connector

Pin #

Actual voltage/actual 

current

Setting range

Default

Front print

8-6

FRONT

0 – 800

350

–

–

–

2.0 – 2.5Kv (35±1.0

µ

A)

High voltage 
power PWB 
(MC/DV/TC)

Back print

BACK

0 – 800

350

–

–

–

2.0 – 2.5Kv (35±1.0

µ

A)

Transfer belt 
(cleaning)

8-17

SHF FRONT

0 – 600

450

–

–

–

AC4.5Kv (p-p)

SHF BACK

0 – 600

450

–

–

–

AC4.5Kv (p-p)

THV-

0 – 75

10

DC -100±10v

CN2

1

DC -300±10v /

AC4.5Kv (p-p)

Transfer roller 
(cleaning)

8-18

CRHV PLUS

0 – 250

200

+2.0±0.1v

–

Check pin +2000±100v

High voltage 
power PWB 
(TC cleaning)

Transfer roller 
(print)

CRHV MINUS

0 – 250

200

–2.0±0.1v

–

Check pin –2000±100v

Press [START] key.

Press [CUSTOM SETTINGS] key. 

Press [START] key.

Press [CUSTOM SETTINGS] key. 
Or after 30sec output.

SIMULATION 8-6

1

THV+ SETTING. SELECT 1-2, AND PRESS START.

1.FRONT 

350

2.BACK 

350

SIMULATION 8-6

THV+ SETTING. INPUT VALUE, AND PRESS START.

1.FRONT(0-800)

350

SIMULATION 8-6

THV+ SETTING. EXECUTING···.

1.FRONT

350

CN2

1