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AR-M550/M620  DETAILS OF EACH SECTION  6 - 136

1) Remove the resist roller unit. (See “2. Paper feed, paper transport,

duplex, and paper exit reverse sections” “(Vertical paper transport
section 2)”, “a. Resist roller unit”)

2) Remove the flywheel. (See “b-1. OPC drum motor” in this section)

3) Remove the main motor. (See “a-1. Main motor” in this section)

4) Remove the main drive unit. (See “a-1. Main motor” in this section)

5)Remove the resist roller front drive motor.

1) Remove the resist roller unit. (See “2. Paper feed, paper transport,

duplex, and paper exit reverse sections” “(Vertical paper transport
section 2)”, “a. Resist roller unit”)

2) Remove the flywheel. ((See “b-1. OPC drum motor” in this section

(a. Drum drive unit))

3) Remove the main motor. (See “a-1. Main motor” in this section)

4) Remove the main drive unit. (See “a-1. Main motor” in this section)

5) Disconnect the connector, and remove the main drive frame.

6) Disconnect the connector, and remove the resist roller clutch unit.

∗

When installing, be sure to ensure that the projection of the plate is
engaged in the clutch rotation stopper.

7) Remove the bearing, the E-ring, and the set screw, and remove

the resist roller clutch.

1) Remove the rear cabinet. 

2) Disconnect the connector, and remove the main motor.

AR-M550/M620  DETAILS OF EACH SECTION  6 - 137

(Replacement parts)

1) Remove the rear cabinet. 

2) Disconnect the connector, the harness clamp, and the earth wire.

Remove the high voltage PWB unit.

3) Remove the plastic E-ring, the belt holding sheet, the belt, and the

pulley.

∗

When installing, be careful of the direction of the belt holding sheet.

4) Remove the harness clamp, and remove the manual paper feed

drive unit.

∗

Remove the screw which was indicated with the arrow mark.

(Replacement parts)

No.

Unit

Parts

a

Manual paper feed drive unit

a

No.

Unit

Parts

a

1/2 paper feed drive unit

1

Vertical paper transport motor

2

Paper feed tray 3/4 paper 
transport clutch 2

3

Paper feed clutch (Paper feed 
tray 1)

4

Horizontal paper transport 
clutch

5

Paper feed clutch (Paper feed 
tray 2)

6

Paper pickup solenoid (Paper 
feed tray 1)

b

Other

1

Remove the paper tray lift-up 
motor (paper feed tray 1)

2

Paper tray lift-up motor (Paper 
feed tray 2)

3

Paper pickup solenoid (Paper 
feed tray 2)

b-1

a-2

a-3

a-1

a-5

a-4

b-2

b-3

a

a-6

AR-M550/M620  DETAILS OF EACH SECTION  6 - 138

1) Remove the main motor. (See “a-1. Main motor”  in the “[Paper

feed/paper transport drive section]”)

2) Remove the high voltage PWB unit. (See “a. Manual paper feed

drive unit” in the “[Manual paper feed drive section]”)

3) Pull out the left door.

4) Disconnect the connector and remove the harness clamp. Remove

the DV fan unit.

5) Disconnect the connector and remove the harness holder.

6) Remove the plastic E-ring, the belt holding sheet, the belt, and the

pulley. Remove the joint plate.

∗

When installing, be careful of the direction of the belt holding sheet.

7) Remove the harness, and remove the drive joint plate.

∗

When installing, temporarily fix the 1/2 paper feed drive unit to the
main unit, and install the drive joint plate. Then tighten the screw of
the drive unit securely.

8) Disconnect the connector and remove the harness clamp. Remove

the 1/2 paper feed drive unit.

∗

Remove the screw which was indicated with the arrow mark.

1) Remove the 1/2 paper feed drive unit. (See “a. 1/2 paper feed drive

2) Loosen the screw to release the tension, and remove the belt.

3) Remove the parts.

AR-M550/M620  DETAILS OF EACH SECTION  6 - 139

4) Remove the 1/2 paper feed drive frame lower. Remove the har-

ness clamp.

5) Disconnect the connector, and remove the vertical paper transport

motor.

1) Remove the 1/2 paper feed drive unit. (See “a. 1/2 paper feed drive

2) Remove the 1/2 paper feed drive frame lower. (See “a-1. Vertical

3) Disconnect the connector and remove the harness lamp, and

remove the paper feed tray 3/4 and the paper transport clutch 2
unit.

4) Remove the E-ring, and remove the paper feed tray 3/4 and the

paper transport clutch 2.

1) Remove the 1/2 paper feed drive unit. (See “a. 1/2 paper feed drive

2) Remove the 1/2 paper feed drive frame lower. (See “a-1. Vertical

3) Disconnect the connector and remove the harness lamp, and

remove the paper feed clutch unit.

4) Remove the E-ring, and remove the paper feed clutch.