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AR-C172M  SETTING AND ADJUSTMENTS  8 - 4

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

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

8) Press the [EXECUTE] key.

The developing bias 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 8-6 mode.

SIM 8-6

2) Select the 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.

Press the [EXECUTE] key to output the transfer voltage.

The image density sensor sections are of uneven quality in parts
and assembly. This causes variations in the absolute detection
level between machines. This adjustment (calibration) is per-
formed to correct the variations.

This adjustment is required in the following cases:

• When the image density sensor is replaced.

• When the transfer unit is replaced. 

• When maintenance is performed. 

• When U2 trouble occurs.

• When the PCU PWB is replaced.

• When the EEPROM on the PCU PWB is repalced.

The targets of the adjustment are the color image density sensor
and the black image density sensor. There are following adjust-
ment methods:

• Color image density sensor adjustment (adjustment by the

adjustment jig) SIM44-13

• Black image sensity sensor adjustment SIM44-2

• Image density sensor adjustment (The color image density sen-

sor and the black image density sensor are adjusted at the
same time.) (Simple adjustment) SIM44-36

Normally the following adjustments are executed:

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

the adjustment jig) (SIM44-13)

• ADJ 2B Black image density sensor adjustment (SIM44-2)

Item

Print mode

Standard setting 

value (Default)

Adjustment 

range

Output voltage (Kv)

K

C

M

Y

K

C

M

Y

A

PLAIN SPX CL

Color

Normal paper

78mm/s

153 141 119 119

51 - 255

2

2

2

2

B

PLAIN DPX CL

Color

Normal paper(Duplex mode)

78mm/s

168 155 129 129

2.3

2.3

2.3

2.3

C

OHP1  CL

Color

Transparency  film  1

78mm/s

204 187 153 153

3

3

3

3

D

OHP2 CL

Color

Transparency film 2

58.5mm/s 137 150 153 163

1.7

2.2

3

3.3

E

HEAVY P1 SPX CL

Color

Thick paper 1

58.5mm/s 158 146 122 122

2.1

2.1

2.1

2.1

F

HEAVY P1 DPX CL

Color

Thick paper 1(Duplex mode) 58.5mm/s 188 173 142 142

2.7

2.7

2.7

2.7

G

HEAVY P2 CL

Color

Thick paper 2

58.5mm/s 173 159 132 132

2.4

2.4

2.4

2.4

H

ENVELOPE  CL

Color

Envelope

78mm/s

153 141 119 119

2

2

2

2

I

PLAIN SPX BW

B & W Normal paper

117mm/s

168

2.3

J

PLAIN DPX BW

B & W Normal paper(Duplex mode)

117mm/s

178

2.5

K

OHP1 BW

B & W Transparency film 1

78mm/s

204

3

L

OHP2 BW

B & W Transparency film 2

58.5mm/s 137

1.7

M HEAVY P1 SPX BW

B & W Thick paper 1

58.5mm/s 147

1.9

N

HEAVY P1 DPX BW

B & W Thick paper 1(Duplex mode) 58.5mm/s 178

2.5

O

HEAVY P2 BW

B & W Thick paper 2

58.5mm/s 163

2.2

P

ENVELOPE BW

B & W Envelope

117mm/s

168

2.3

Color

Actual output variable range

Voltage change/Adjustment value (1) (Varying amount when the adjustment value is changed by 1)

K

0 to 4000V

About 19.6V

C

0 to 4500V

About 22.1V

M

0 to 6000V

About 29.4V

Y

0 to 6000V

About 29.4V

AR-C172M  SETTING AND ADJUSTMENTS  8 - 5

There are two methods to adjust the color image density sensor;
one method uses the adjustment jig, and the other method does
not use it.

If there is no adjustment jig available, the simple adjustment
(SIM44-36) can be made, which may, however, result in insuffi-
cient adjustment accuracy depending on the machine condition.

If toner, the OPC drum, and the transfer belt are not new ones or
almost new ones, the simple adjustment is not recommended.

Even though the machine conditions are well, the adjustment by
use of the adjustmment jig gives a higher adjustment accuracy
than the adjustment without the adjustment jig (simple adjust-
ment).

Also note that SIM44-36 must not executed unnecessarily after
execution of the color image density sensor adjustment (adjust-
ment by the adjustment jig) with SIM44-13.

If SIM 44-36 is executed, the contents of the color image density
sensor adjustment (adjustment by the adjustment jig) with SIM44-
13 are erased, and the adjustment result of SIM44-36 is saved.

When the color image density sensor is adjusted with SIM44-13
and the black image density sensor is adjsuted with SIM 44-2, the
adjustment with SIM44-36 is not required.

To adjust the black image density sensor, the adjustment jig is not
required.

Before executing this adjustment, check the following items:

• Check that the color imagte density sensor is clean.

• Check that the image density sensor calibration plate is clean.

• Check that the transfer belt is free from scratches.

1) Open the front cover of the machine.

2) Insert the color image density sensor adjustment jig

(CPLTM6305FC01) into the long hole in the transfer unit
frame, and close the left cabinet.

3) With the front cover of the machine open (with the cover open/

close switch OFF), turn on the power.

4) Perform

SIM 44-13

5)  Close the front cover of the machine.

6)  Press the [EXECUTE] key.

The adjustment is performed automatically. When the adjust-
ment is completed, the adjustment result is displayed and the
the [EXECUTE] key display returns to the original state.

7) Remove the color image density sensor adjustment jig.

If the adjustment is not completed normally, "ERROR" is dis-
played.

In that case, check the following sections for no abnormality. If
there is any abnormality, repair the part and perform the adjust-
ment again. In case of an error, the adjustment result is not
revised.

• Image density sensor

• PCU PWB

• Transfer belt

The color image density sensor adjustment jig is available in the
following two forms:

• The jig metal plate with the calibration sheet attached to it

(CPLTM6305FC01)

1) Enter the SIM44-2 mode.

2) Press the [EXECUTE] key. 

The adjustment is performed automatically. When the adjust-
ment is completed, the adjustment result is displayed and the
the [EXECUTE] key display returns to the original state.

Display

Content

Min 

Value

Max 

Value

Default 

value

A

PCS_C 
CARB ADJ

Color image density 
sensor LED current 
adjustment target value

1

255

108

B

PCS_C 
DARK

Color image density 
sensor dark voltage 
level

0

255

0

C

PCS_C 
LED ADJ

Color image density 
sensor current 
adjustment value

1

255

51

Display

Content

Min 

Value

Max 

Value

Default 

value

A

PCS_C 
LED ADJ

Color image density 
sensor LED current 
adjustment value

1

255

51

B

PCS  K 
LED ADJ

Black image density 
sensor LED Current 
adjustment value

1

255

51

C

PCS_K 
GAIN

Black image density 
sensor output gain 
(AMP) adjustment value

0

15

0

D

PCS_K 
DARK

Black image density 
sensor dark voltage 
level

0

255

0

E

PCS_K 
GRND

Black image density 
sensor transfer belt 
surface detection level

0

255

0

F

BELTMAX Transfer belt surface 

max. detection level 
(Black image sensor)

0

255

0

G

BELTMIN

Transfer belt surface 
min. detection level 
(Black image sensor)

0

255

0

AR-C172M  SETTING AND ADJUSTMENTS  8 - 6

If the adjustment is not completed normally, "ERROR" is dis-
played.

In that case, check the following sections for no abnormality. If
there is any abnormality, repair the part and perform the adjust-
ment again.

In case of an error, the adjustment result is not revised.

• Image density sensor

• PCU PWB

• Transfer belt

This adjustment must be performed in the following cases:

• When the scanner (writing) unit is replaced.

• When the scanner (writing) unit is removed from the machine.

• When the print image is shifted. 

(Especially conspicuous for text and line drawings)
(The scanner (reading) unit is normal, but the print image focus
of the print engine is not normal.)

• When there is uneven density in the main scanning direction.

• When the color balance adjustment does not result in proper

color matching.

• When in installation or when the installing site is changed. (Nec-

essary depending on the case)

1) Execute the process correction forcibly. (SIM44-6)

This simulation is used to correct the print density of the
adjustment pattern.

2) Enter the SIM 61-4 mode.

SIM 61-4

3) Set the items A, B and C according to the table below.

4) Select the A4 (11 x 8 1/2) paper feed tray.

5) Press the [EXECUTE] key.

The focus adjustment pattern is printed.

6) Check the printed focus adjustment pattern for each color.

If focus is proper, the half-tone belts are printed properly.
When four or five half-tone belts of each color are printed and
there is no density difference in the main scanning direction
(back and forth), the focus is proper both on the front and the
back sides.

7) If the above condition is not satisfied, turn the focus adjust-

ment screws on the front/rear frame sides to adjust focus.

Focus on the front side can be separately adjusted from focus
on the rear side.

Front frame side

H

BELTDIF

Difference between the 
max. value and the min. 
value of the transfer belt 
surface detection level 
(BELTMAX-BELTMIN)

0

255

0

Parameter

Set value

A

PRINT PATTERN

2

B

LINE PITCH

7

C

POSITION

6

Display

Content

Min 

Value

Max 

Value

Default 

value

Check that the half-tone belts of each color are printed
in good balance. 

Front side

Paper exit 
direction

AR-C172M  SETTING AND ADJUSTMENTS  8 - 7

Rear frame side

Execute procedures 4 to 6 for each color.

This adjustment must be performed in the following cases:

• When the scanner (writing) unit is replaced.

• When the scanner (writing) unit is removed from the machine.

• When the print image includes skew.

(When the scanner (reading) unit is normal and the print image
of the print engine includes skew.)

• When a color image registration error occurs.

(There is an image registration difference in the main scanning
direction.)

• When there is uneven density in the main scanning direction.

• When the color balance adjustment does not result in proper

color matching.

• When in installation or when the installing site is changed. (Nec-

essary depending on the case)

1) Enter the SIM 64-1 mode.

SIM 64-1

2) Set the items A and B according to the table below.

3) Select the A3 (11 x 17) size paper feed tray.

4) Select Black (K) and press the [EXECUTE] key.

The grid patter (one page) is printed.

5) Check the printed grid pattern. (Check for image skew (distor-

tion).)

If the right-angle level of the traverse print line is 0.5mm or
less for the longitudinal print line of paper, there is no need to
adjust.

6) If the above conditions are not satisfied, remove the develop-

ing unit and turn the print engine image skew adjustment
screw to adjust.

At that time, use SIM 7-1 to set DV CHECK DISABLE to
Enable and to disable the developing unit installation detec-
tion.

If skew is made in the arrow direction A, turn the adjustment
screw clockwise. If skew is made in the arrow direction B, turn
the adjustment screw counterclockwise.

7) Enter the SIM 61-4 mode.

SIM 61-4

8) Select the A4 (11 x 8.5) size paper feed tray. 

9) Press the [EXECUTE] key.

The print engine image skew adjustment pattern is printed.
(One page)

Parameter

Set value

A

PRINT PATTERN

1

B

DENSITY

1

A

B

0.5mm or less

Right-angle

Reference line

Longitudinal direction

Comparison line