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AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 56

3) Remove the harness and remove the AC PWB from the sup-

porter.

1) Remove the rear cabinet, the DC power CFM unit, the rear left

cabinet lid, and the rear left cabinet.

2) Remove the connector, the harness, and the screw. Remove

the Power PWB unit.

3) Remove the connector and the screw, and remove the high

voltage TC power PWB.

1) Remove the paper exit tray cabinet right.

2) Remove the screw, and remove the box cover. Remove the

screw, and remove the ICU PWB.

1) Remove the rear cabinet.

2) Remove the DC power CFM unit.

3) Remove the driver PWB unit.

4) Remove the PCU PWB unit.

5) Remove the screw and the connector, and remove the intake

duct FAN.

6) Remove the screw and the intake duct.

7) Remove the high voltage MC PWB.

8) Remove the connector screw and the drum drive unit.

∗

Remove the eight screws which are indicated with an arrow
mark on the plate drive frame and are fixing the resin drive
frame.
(Never remove the screws which are fixing the plate drive
frame upper.)

AR-C172M  SETTING AND ADJUSTMENTS  8 - 1

Each adjustment item in the adjustment item list is indicated with its 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 a trouble may occur.

∗

1: By executing the collective adjustment of image position and magnification ratio (ADJ21) (Automatic void adjustment SIM50-28), the

adjustments of SIM50-10, 48-1, 50-12, and 50-1 can be simply and automatically performed at once.

JOB No

ADJUSTMENT ITEM LIST

SIMULATION

ADJ 1

High voltage adjustment

ADJ 1A Main charger grid voltage adjustment

8-2

ADJ 1B DV bias voltage adjustment

8-1

ADJ 1C Transfer voltage adjustment

8-6

ADJ 2

Image density sensor adjustment

ADJ 2A Color image density sensor adjustment (adjustment by the 

adjustment jig)

44-13

ADJ 2B Black image density sensor adjustment

44-2

ADJ 3

Image focus, image skew adjustment (LED (writing) unit)

64-1/61-4

ADJ 4

Image registration adjustment

ADJ 4A Image registration adjustment (Auto adjustment)

50-22

ADJ 4B Image registration adjustment (Manual adjustment)

50-20

ADJ 5

Image position/print area adjustment 
(Print engine section)

ADJ 5A Main scanning direction image position adjustment 

(Print engine section)

50-10

ADJ 5B Sub scanning direction image position/print area adjustment 

(Print engine section)

50-5

ADJ 6

Copy image distortion adjustment

ADJ 6A Scanner (reading) unit parallelism adjustment

ADJ 6B Copy image sub scanning direction distortion adjustment

ADJ 6C Copy image main scanning direction distortion adjustment

ADJ 6D Scan image distortion adjustment

ADJ 7

Copy image focus (main scanning direction copy magnification ratio) adjustment (CCD unit position adjustment)

48-1

ADJ 8

Sub scanning direction copy magnification ratio adjustment

48-1

ADJ 9

Main scanning direction copy image position adjustment (Scanner (reading) section)

50-12

ADJ 10 Copy image position/image loss/void area adjustment

50-1/50-2

ADJ 11 Copy color balance/density 

adjustment

ADJ 11A CCD gamma adjustment (CCD calibration)

(Normal document copy mode)

63-3 (63-5)

ADJ 11B Copy color balance adjustment (Auto adjustment)

46-24

ADJ 11C Copy color balance adjustment (Manual adjustment)

46-21

ADJ 11D Copy density adjustment in low-density area

(Normally unnecessary to adjust.)

46-1/2

ADJ 11E Copy color balance density adjustment (each copy mode)

(Normally unnecessary to adjust.)

46-10 to 16

ADJ 11F CCD gamma adjustment (CCD calibration)

(Copy document copy mode)

63-9

ADJ 11G Image edge section gamma/density adjustment 

(Black text and black line reproduction adjustment) (Normally 
unnecessary to adjust.)

46-27

ADJ 11H Copy color balance adjustment (Single color Copy mode)

(Normally unnecessary to adjust.)

46-25

ADJ 11I Auto color balance adjustment by user (Copy color balance auto 

adjustment enable setting and adjustment)

26-53

ADJ 12 Fusing pressure adjustment

ADJ 13 Fusing paper guide position adjustment

ADJ 14 Document size sensor adjustment

ADJ 14A Original size sensor detection point adjustment

41-2

ADJ 14B Original size sensor sensitivity adjustment

41-2

ADJ 15 Manual paper feed tray paper size sensor adjustment

40-2

ADJ 16 Touch panel coordinates setting

65-1

ADJ 17 Power voltage adjustment

ADJ 17A 3.4 V power voltage adjustment

ADJ 17B 5.0 V power voltage adjustment

ADJ 18 FAX/scanner mode image loss adjustment

50-27

ADJ 19 RSPF scanning position automatic 

adjustment

ADJ 19A RSPF scanning position automatic adjustment

53-8

ADJ 19B RSPF image lead edge adjustment

50-6

ADJ 20 RSPF lead edge skew adjustment

ADJ 21 Collective adjustment of image 

position and magnification ratio

(

∗

1)

50-28

ADJ 22 Printer color balance adjustment

ADJ 20A Printer automatic color balance adjustment

67-24

ADJ 20B Printer color balance adjustment (By the key operator program)

AR-C172M  SETTING AND ADJUSTMENTS  8 - 2

Since the output voltage cannot be checked directly due to the
machine structure, the adjustment value of the simulation is set to
the default (specified value) to perform the adjustment.

This adjustment must be performed in the following cases:

• When the high voltage power PWB is replaced.

• When a U2 trouble occurs.

• When the PCU PWB is replaced.

• When the EEPROM of the PCU PWB is replaced.

1) Enter the SIM 8-2 mode.

SIM 8-2

2) Select the output mode to be adjusted with the color key and

scroll key.

3) Enter the adjustment value (specified value), and press the

[OK] key.

By entering the default value (specified value), the specified
voltage is outputted.

Remark: When the default value is set, the specified voltage is

outputted.
There is, therefore, no need to check the output voltage
unless there is a doubt for any abnormality in the output
voltage.
If there is a need to check that the normal voltage is out-
putted or to adjust by referring to the output voltage, use
the method below.

1) Remove the rear cover of the machine.

2) Remove the image process fan motor and the duct.

3) Connect the high voltage adjustment harnesses (DHAi-

3471FCZZ/DHAi-3472FCZZ) with the connectors CNMON
and CNMONK on the high voltage PWB.

4) Enter the SIM8-1 mode.

5) Select the output mode to be adjusted with the color key and

the scroll key.

6) Check that the pin numbers of the connectors CNMON and

CNMONK are properly assigned to the connector pin numbers
of the high voltage adjustment harness.

7) Apply a digital multi-meter to the connector pins of the high

voltage adjustment harness corresponding to the output mode
to be adjusted.

Color

Item Operation 

mode

Adjustment value

Main charger grid voltage

Monitor (High voltage PWB)

Pin 

No.

Actual 

voltage

Adjustment 

range

Specified 

value 

(Default)

Monitor voltage 

(Specified value)

Connector

K

A: HIGH SPEED

High speed (117mm/s) (B & W)

180 – 700

620

53.5 ± 0.2v

CNMONK

1

–620v

B: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

180 – 700

620

53.5 ± 0.2v

CNMONK

1

–620v

C: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

180 – 700

620

53.5 ± 0.2v

CNMONK

1

–620v

C

A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

180 – 700

620

53.5 ± 0.2v

CNMON

3

–620v

B: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

180 – 700

620

53.5 ± 0.2v

CNMON

3

–620v

M

A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

180 – 700

620

53.5 ± 0.2v

CNMON

7

–620v

B: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

180 – 700

620

53.5 ± 0.2v

CNMON

7

–620v

Y

A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

180 – 700

620

53.5 ± 0.2v

CNMON

11

–620v

B: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

180 – 700

620

53.5 ± 0.2v

CNMON

11

–620v

A

B

AR-C172M  SETTING AND ADJUSTMENTS  8 - 3

8) Press the [EXECUTE] key.

The main charger grid voltage is outputted for 30sec.

If this operation is performed for a long time, the OPC drum
and the developing roller may be damaged. Be careful to per-
form this operation in a short time.

It is advisable to install an unnecessary developing unit and
unnecessary OPC drums to the machine for this adjustment.

9) Check the monitor voltage with the digital multi-meter.

If the monitor voltage is not in the above specified range,
change the adjustment value and adjust again. If the specified
voltage is not obtained even by changing the adjustment
value, the following parts may be judged as defective.

High voltage PWB

PCU PWB

Developing unit

Photoconductor unit

High voltage circuit electrode

This adjustment must be performed in the following cases:

• When the high voltage power PWB is replaced.

• When a U2 trouble occurs.

• When the PCU PWB is replaced.

• When the EEPROM of the PCU PWB is replaced.

1) Enter the SIM 8-1 mode.

SIM 8-1

2) Select the output mode to be adjusted with the color key and

the scroll key.

3) Enter the adjustment value (specified value), and press the

[OK] key.

By entering the default value (specified value), the specified
voltage is outputted.

Remark: When the default value is set, the specified voltage is

outputted. 
There is, therefore, no need to check the output voltage
unless there is a doubt for any abnormality in the output
voltage. 
If there is a need to check that the normal voltage is out-
putted or to adjust by referring to the output voltage, use
the method below.

1) Remove the rear cover of the machine. 

2) Remove the image process fan motor and the duct.

3) Connect the high voltage adjustment harnesses (DHAi-

3471FCZZ/DHAi-3472FCZZ) with the connectors CNMON
and CNMONK on the high voltage PWB.

4) Enter the SIM8-2 mode.

5) Select the output mode to be adjusted with the color key and

the scroll key.

6) Check that the pin numbers of the connectors CNMON and

CNMONK are properly assigned to the connector pin numbers
of the high voltage adjustment harness.

Color

Item

Operation mode

Adjustment value

Developing bias voltage

Monitor (High voltage PWB)

Pin 

No.

Actual 

voltage

Adjustment 

range

Specified 

value 

(Default)

Monitor voltage 

(Specified value)

Connector

K

A: HIGH SPEED

High speed (117mm/s) (B & W)

0 – 585

215

3.94 ± 0.1V

CNMONK

3

– 215v

B: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

0 – 585

215

3.94 ± 0.1V

CNMONK

3

–215v

C: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

0 – 585

215

3.94 ± 0.1V

CNMONK

3

– 215v

C

A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

0 – 585

265

5.76 ± 0.1V

CNMON

1

– 265v

B: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

0 – 585

265

5.76 ± 0.1V

CNMON

1

– 265v

M

A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

0 – 585

265

5.76 ± 0.1V

CNMON

5

– 265v

B: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

0 – 585

265

5.76 ± 0.1V

CNMON

5

– 265v

Y

A: MIDDLE SPEED Middle speed (78mm/s) (Color) (B & W)

0 – 585

240

4.75 ± 0.1V

CNMON

9

– 240v

B: LOW SPEED

Low speed (58.5mm/s) (Color) (B & W) 
(Special paper)

0 – 585

240

4.75 ± 0.1V

CNMON

9

– 240v

A

B