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AR-M550/M620  SETTING AND ADJUSTMENTS  7 - 1

Each adjustment item in the adjustment item list is associated with a specific JOB number. Perform the adjustment procedures in the sequence of Job
numbers from the smallest to the greatest.

However, there is no need to perform all the adjustment items. Perform only the necessary adjustments according to the need.

Unnecessary adjustments can be omitted. Even in this case, however, the sequence from the smallest to the greatest JOB number must be observed.

If the above precaution should be neglected, the adjustment would not complete normally or trouble may occur.

Job No

Adjustment item list

Simulation

ADJ 1

Adjusting high voltage values

ADJ 1A

Adjust the main charger grid voltage

8-2

ADJ 1B

Adjust the developing bias voltage

8-1

ADJ 1C

Adjust the transfer voltage

8-6, 8-17, 8-18

ADJ 2

Adjusting the developing unit

ADJ 2A

Adjust the developing doctor gap

ADJ 2B

Adjust the developing roller main pole

ADJ 3

Adjusting image distortions

ADJ 3A

Adjust print image distortions (LSU parallelism 
adjustment)

64-1

ADJ 3B

Adjust the scanner (reading) unit parallelism

ADJ 3C

Adjust scanned image distortions in the sub-scanning 
direction

ADJ 3D

Adjust scanned image distortions in the main scanning 
direction - 1

ADJ 3E

Adjust scanned image distortions in the main scanning 
direction - 2

ADJ 4

Adjusting the SPF parallelism

ADJ 4A

Adjust SPF levelness

ADJ 4B

Adjust SPF skews

64-1

ADJ 5

Adjusting the image focus

ADJ 5A 

Adjust the image focus in original table mode and SPF 
front-face mode (CCD)

48-1

ADJ 5B

Adjust the image focus in SPF back-face mode (CIS)

ADJ 6

Adjusting the image magnification

ADJ 6A

Adjust the image magnification in the main scanning 
direction in original table mode (CCD)

48-1

ADJ 6B

Adjust the image magnification in the sub-scanning 
direction in original table mode

48-1

ADJ 6C

Adjust the image magnification in the main scanning 
direction in SPF front-face mode (CCD)

48-1

ADJ 6D

Adjust the image magnification in the main scanning 
direction in SPF back-face mode (CIS)

48-1

ADJ 6E

Adjust the image magnification in the sub-scanning 
direction in SPF mode

48-1, 48-5

ADJ7

Adjusting the image off-center

ADJ 7A

Adjust the print image off-center (print engine section)

50-5 (50-10)

ADJ 7B

Adjust the scanned image off-center in original table 
mode (scan section)

50-12

ADJ 7C

Adjust the scanned image off-center in SPF front-face 
mode (scan section)

50-12

ADJ 7D

Adjust the scanned image off-center in SPF back-face 
mode (scan section)

50-12

ADJ 8

Adjusting the image position, image loss, and 
void area

ADJ 8A

Adjust copied image loss/void area in original table mode

50-1

ADJ 8B

Adjust the original scan start position (adjust the scanner 
read position in SPF-mode front face scan)

53-8

ADJ 8C

Adjust the copied image loss/void area in SPF mode

50-6

ADJ 8D

Adjust the image loss in scanner mode

50-27

ADJ 8E

Adjust the image loss for images sent in fax mode

50-27

ADJ 9

Adjusting the copied image quality

ADJ 9A

Adjust the binary mode copy density for all modes at once

46-2

ADJ 9B

Adjust the copy density in text binary mode

46-9, 10, 11

ADJ 9C

Adjust the copy density in text/photo binary mode

ADJ 9D

Adjust the copy density in photo binary mode

ADJ 9E

Adjust the copied image gamma in copy mode

46-18

ADJ 9F

Adjust the copied image sharpness

46-31

ADJ 10

Adjusting the print quality in fax mode

ADJ 10A

Adjust the fax mode print density for all modes at once

46-12

ADJ 10B

Adjust the fax mode print density in standard mode

46-13, 46-14

ADJ 10C

Adjust the fax mode print density in small-character mode

ADJ 10D

Adjust the fax mode print density in fine mode

ADJ 10E

Adjust the fax mode print density in super fine mode

ADJ 10F

Adjust the fax mode print density in 600dpi mode

AR-M550/M620  SETTING AND ADJUSTMENTS  7 - 2

Note: Adjusting the output voltage requires the ability to measure

internal impedance of 1000 MW.

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 (7) of the high

voltage PWB and the chassis GND.

ADJ11

Adjusting the image quality in scan mode

ADJ 11A

Adjust the scan mode image density for all modes at once

46-21

ADJ 11B

Scan mode image density adjustment/individual setup 
(standard mode)

46-21, 46-22

ADJ 11C

Scan mode image density adjustment/individual setup 
(small-character mode)

ADJ 11D

Scan mode image density adjustment/individual setup 
(fine mode)

ADJ 11E

Scan mode image density adjustment/individual setup 
(super fine mode)

ADJ 11F

Adjust the image gamma in scanner mode

46-27

ADJ12

Common image quality adjustments for all of 
copy, scan, and fax modes

ADJ 12A

Correct the image density in original table mode/SPF 
mode

46-20

ADJ 12B

Set up the auto mode operation for copy, scan, and fax

46-19

ADJ 12C

Adjust the shading reference value (gain adjustment) 

46-17

ADJ13

Adjusting the fusing paper guide position

ADJ 14

Adjusting the paper size detection

ADJ 14A

Adjust the paper width sensor for the manual paper feed 
tray

40-2

ADJ 14B

Adjust the paper width sensor for paper feed tray 3

40-12

ADJ 14C

Adjust the paper width sensor for the SPF paper feed tray

53-6

ADJ 15

Adjusting the original size detection (in original 
table mode)

ADJ 15A

Adjust the detection point of the original size sensor (in 
original table mode)

ADJ 15B

Adjust the sensitivity of the original size sensor

ADJ16

Adjusting the touch panel coordinates

65-1

ADJ17

Adjusting the supply voltage

Job No

Adjustment item list

Simulation

Item/operation mode

Simulation

High voltage power PWB (MC/DV/TC)

Setting 

range

Default

Adjustment voltage 

(monitor voltage)

Connector

Pin #

Actual 

voltage

Copy

Auto mode

8-2

AUTO

200 – 1000

580

–620±5v

CN2

3

–590±5v

Text mode

CHARACTER

200 – 1000

580

–620±5v

CN2

3

–590±5v

Text/photo mode

MIX

200 – 1000

580

–620±5v

CN2

3

–590±5v

Photo mode

PHOTO

200 – 1000

580

–620±5v

CN2

3

–590±5v

Printer

All modes

PRINTER

200 – 1000

580

–620±5v

CN2

3

–590±5v

FAX

All modes

FAX

200 – 1000

580

–620±5v

CN2

3

–590±5v

CN2

3

AR-M550/M620  SETTING AND ADJUSTMENTS  7 - 3

3) Go through the modes specified in Simulation 8-2.

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) Remove the rear cover of the machine. 

2) Apply a digital multi-meter to the connector CN2 pin (7) of the high

voltage PWB and the chassis GND.

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

Press [START] key.

Press [CUSTOM SETTINGS] key. 

Press [START] key.

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

SIMULATION 8-2

1

MAIN GRID SETTING. SELECT 1-6, AND PRESS START.

1.AUTO 

580

  2.CHARACTER 

580

3.MIX 

580

   4.PHOTO 

580

5.PRINTER 

580

  6.FAX 

580

SIMULATION 8-2

MAIN GRID SETTING. INPUT VALUE, AND PRESS START.

1.AUTO (200-1000)

580

SIMULATION 8-2

MAIN GRID SETTING. EXECUTING···.

1.AUTO

580

Item/operation mode

Simulation

High voltage power PWB (MC/DV/TC)

Setting range

Default

Adjustment voltage 

(monitor voltage)

Connector

Pin #

Actual 

voltage

Copy

Auto mode

8-1

AUTO

0 – 750

495

–500±5v

CN2

7

–500±5v

Text mode

CHARACTER

0 – 750

495

–500±5v

CN2

7

–500±5v

Text/photo mode

MIX

0 – 750

495

–500±5v

CN2

7

–500±5v

Photo mode

PHOTO

0 – 750

495

–500±5v

CN2

7

–500±5v

Printer

All modes

PRINTER

0 – 750

495

–500±5v

CN2

7

–500±5v

FAX

All modes

FAX

0 – 750

495

–500±5v

CN2

7

–500±5v

Cleaning mode

PLUS

0 – 250

150

+150±5v

CN2

7

+150±5v

CN2

7

Press [START] key.

Press [CUSTOM SETTINGS] key. 

Press [START] key.

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

SIMULATION 8-1

1

DV BIAS SETTING. SELECT 1-7, AND PRESS START.

1.AUTO 

495

  2.CHARACTER 

495

3.MIX 

495

   4.PHOTO 

495

5.PRINTER 

495

  6.FAX 

495

  7.PLUS 

150

SIMULATION 8-1

DV BIAS SETTING. INPUT VALUE, AND PRESS START.

1:AUTO (0-750)

495

SIMULATION 8-1

DV BIAS SETTING. EXECUTING···.

1:AUTO

495

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