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AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 32

The paper feed tray is provided with the paper size detection
block, and the status of this block is detected with the combination
of ON/OFF of the four paper size detectors to recognize the paper
size.

Relationship between the paper size detector and the paper size

EXTRA: Operates with the paper size set by the user program.

The lift position sensor detects the lift plate lower limit position.
Then lift-up operation is started, and the rotation of the lift motor
up to detection of the upper limit by the paper upper limit detector
is used to calculate the paper remaining quantity.

The paper pickup roller moves up and down to press paper and
separates the top paper, which is fed to the paper feed roller.

The paper feed roller feeds paper to the paper transport section.
The separation roller prevents against double feed.

The manual paper feed clutch controls ON/OFF of the pickup
roller and the paper feed roller.

The manual transport roller transports paper to the resist roller.

The paper size is detected by the paper length detector and the
paper width sensor.

A volume-type sensor is used as the paper width sensor. The
resistance varies according to variation of the paper guide position
to detect the paper width.

The tray position detector detects that the paper tray is set to the
maximum length position or to the minimum length position.

When the paper tray is set to the maximum length position, the
paper length detector is forcibly turned ON. This is to recognize it.

This section transports paper from each paper feed section to the
transfer section (resist roller) by two transport rollers.

The paper transport clutch controls ON/OFF of each transport
roller.

Paper size detector

Paper size

Destination

CSS4 CSS3 CSS2 CSS1

Japan

AB 

series

Inch series

ON

OFF

OFF

ON

A3

A3

11 x 17

OFF

OFF

ON

ON

B4

B4

8.5 x 14

ON

OFF

ON

OFF

A4R

A4R

11 x 8.5R

OFF

ON

ON

OFF

A4

A4

11 x 8.5

OFF

ON

ON

ON

B5R

B5

INVOICE

OFF

ON

OFF

ON

B5

A5

FOOLSCAP

ON

ON

ON

OFF

A5

11 x 8.5

A4

ON

ON

OFF

OFF

EXTRA

EXTRA

EXTRA

Patterns other than above

Recognized that the paper tray 

is not inserted.

Transport roller

Transport roller

Paper feed roller

Paper feed roller

Paper stopper

Paper feed motor

Pickup roller

Pickup roller

Separation roller

Separation roller

Clutch

Paper transport roller

Paper transport roller

Paper feed motor

Paper feed clutch

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 33

The resist roller controls the relative position of the transported
paper and the transfer image.

The resist roller is driven by the resist roller motor.

The relative position of paper and the transfer image is determined
by the ON timing of the resist roller motor.

∗

The paper transport section is provided with two paper detec-
tors, which perform the following functions:

1) Paper jam detection

2) Output of the reference signal for the operating timing of each

load

✕

: Check (Clean, replace, or adjust as necessary.)

 

❍

: Clean

 

▲

: Replace

 

∆

: Adjust

 

✩

: Lubricate

 

❏

: Shift position

Upper resist roller

Lower resist roller

PS motor

Unit name

No.

Part name

When 

calling

50K

100K 150K 200K 250K 300K 350K 400K

Remark

Paper feed 
section

1

Cassette section 
paper feed rollers

❍

❍

✕

❍

✕

❍

✕

❍

✕

Replace according to the 
counter of each paper 
feed port or within 2 years.

2

Torque limiter

✕

✕

✕

✕

✕

3

Manual feed section 
paper feed rollers

❍

✕

✕

✕

✕

✕

✕

✕

✕

Replace according to the 
counter of each paper 
feed port or within 2 years.

4

Torque limiter

✕

✕

✕

✕

✕

✕

✕

✕

✕

Transport 
section

5

Transport rollers

❍

❍

❍

❍

❍

❍

❍

❍

❍

6

Transport paper guide

❍

❍

❍

❍

❍

❍

❍

❍

❍

1

2

1

3

3

4

4

3

4

3

1

2

5

5

5

5

6

6

6

6

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 34

1) Remove the cassette.

2) Disengage the pawl, and remove the pickup roller.

Note: Do not remove the transfer belt unit.

1) Remove the cassette.

2) Disengage the pawl, and remove the paper feed roller.

1) Remove the cassette.

2) Disengage the pawl, and remove the paper separation roller.

1) Open the front cabinet, and remove the drum unit.

2) Remove the developing unit.

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 35

3) Remove the front cabinet and the front frame cover.

4) Remove the multi manual paper feed unit.

5) Remove the connection right cabinet, the rear cabinet, and the

rear right cabinet.

6) Remove the screw and the paper feed unit. Remove the con-

nector.

∗

When assembling, fit the positioning pin A with section C.

1) Remove the screw, the rear cabinet, the rear right cabinet, and

the connection right cabinet B.

2) Remove the screw, and remove the paper feed drive motor.

1) Remove the harness and the screw, and remove the paper

feed drive unit.

1) Open the arm cover (A). Disengage the pawl, and remove the

pickup roller (B).

1) Open the arm cover (A), open the auxiliary PG (B), and

remove the paper feed roller (C).

1) Open the vertical transport guide.

2) Open the maintenance cover (A) from the bottom of the multi

paper feed unit. Disengage the pawl and remove the paper
feed separation roller (B).

A

C

A

B

A

B

C

A

B