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AR-M550/M620  DETAILS OF EACH SECTION  6 - 64

Adoption of the rotating toner bottle enables large capacity with a com-
pact toner bottle size. 

When the remaining toner detection sensor in the toner hopper unit
detects no toner, the toner bottle turns to supply toner to the toner hop-
per. Following supply, since the sensor detects full or empty status
inside the toner hopper based on a standard quantity of approximately
150 g of toner, even if the toner cartridge becomes empty, copying is
not immediately suspended because toner inside the toner hopper is
used (approximately 5K/6% print duty documents).

The employment of new toner has reduced the toner consumption per
page by 20 -30%.

8

Transfer roller

Applies a voltage to transfer toner from the OPC drum to paper. 

9

Drum separation pawl

Separates paper from the OPC drum mechanically. 

10

Cleaning blade

The protection circuit to prevent against electric leak of high voltage through the paper guide when the 
humidity is high. 200 Ohm each. 

11

Resist roller

Deflects paper to adjust the paper feed timing to the process section. 

12

Paper dust cleaner

Remove paper dust from the resist roller to reduce paper dust entry to the process section.

No.

Name

Functions

Destination

Toner filling amount

Life with 6% print duty 

documents

Except Japan

1,430g

72,000 sheets

Japan

Provisionally 1,180g

50,000 sheets or more

AR-M550/M620  DETAILS OF EACH SECTION  6 - 65

Code

Signal 

name

Name

Function/Operation

Type

Model

Note

TM1X

TM1X

Toner motor 1

Transports toner in the toner hopper to 
the developing unit. /Transports waste 
toner to the waste toner section.

Synchronous 
motor

TM2X

TM2X

Toner motor 2

Transports toner in the toner bottle to the 
toner hopper. 

Synchronous 
motor

TFSD

TFSD

Toner remaining quantity 
detection signal

Toner hopper remaining quantity 
detection

CRUM

CRUM lap

Stores the toner bottle information.

No.

Name

Operation

1

TH shutter

Serves as a shutter to supply toner from the toner bottle unit to the toner hopper. When a toner bottle 
unit is installed, the shutter opens.

2

Toner mixing roller

Mixes toner in the toner hopper.

3

Waste toner box drive gear

Drives the waste toner transport parts.

4

Waste toner transport plate

Remains toner evenly in the waste toner box.

5

Waste toner transport plate

Remains toner evenly in the waste toner box.

6

Waste toner shutter

Serves as a shutter to receive waste toner from the process unit.

7

TH shaft

Toner supply roller to the toner unit section.

8

Toner supply roller

Toner supply roller to the developing unit section.

TM2X

TM1X

1

7

6

5

4

3

2

10

9

8

11
12

9

8

7

6

5

4

3

2

1

9

8

7

6

5

4

3

2

1

12

11

10

12

11

10

4

3

2

1

4

3

2

1

2

1

1
2

2

1

1
2

PCU PWB

CRUSDA

CRUCLK

+5V2

GND2

B12B-PHDSS-B

CN-11

TNCA

GND2

+24V1

TM1a

TM1b

TM2a

TM2b

TFSD

+24V1
TFSD
GND2

TM1a
TM1b

GND2
+5V2
CRUCLK
CRUSDA
GND2

(NC)

(NC)

SRA-01T-3.2

GND2

PHR-4

+24V1

(NC)

TFSD

CRUCLK
CRUSDA

GND2

DRAWER TSR-04V-K

+5V2

SMR-02V-N/SMP-02V-NC

TM1a
TM1b

SRA-01T-3.2

SMR-02V-N/SMP-02V-NC

TM2a
TM2b

TSDP-12V-K/TSDR-12V-K

TONER HOPPER

8

7

2

1

TFSD

3

2

7

8

1

6

5

4

TFSD

CRUM

AR-M550/M620  DETAILS OF EACH SECTION  6 - 66

The toner cartridge is composed of the toner bottle with toner filled in it,
the TB holder lower which holds the toner bottle and to which the
CRUM and the waste toner box assembly are attached, and the TG
holder upper.

The TB holder lower is attached to the TB shutter. When inserting it to
the machine, the toner hopper rib releases the shutter lock pawl, and
opens in linkage with the TH shutter. When removing the toner car-
tridge from the machine, the TB shutter closes.

NOTE: The toner discharge port of the toner bottle is sealed by the

heat seal. Do not rotate the toner bottle manually, or the heat
seal is dismantled and toner is discharged from the TB shutter
port.

The toner remaining quantity sensor in the toner hopper detects the
toner remaining quantity by the toner stirring roller rotation. When there
is little toner, the toner bottle rotating motor of the machine is rotated.
The toner bottle rotates at 4.2rpm. Toner of about 54g is supplied to
the toner hopper for every rotation. When toner full is not detected after
detecting the state with little toner for a certain period (4min), the toner
cartridge is judged as empty, and the display to urge toner cartridge
replace is shown on the operation panel.

NOTE: When the power is turned on for toner hopper replacement or

cleaning, the toner cartridge replacement display is shown
though toner is not accumulated enough in the toner hopper.
In such a case, turn off/on the power again.

Shutter lock pawl

TB holder upper

Toner bottle

Toner bottle

TB shutter

TB holder lower

CRUM

CRUM

TH shutter

TB holder upper

Heat seal

TB holder lower

AR-M550/M620  DETAILS OF EACH SECTION  6 - 67

✕

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

❍

: Clean

▲

: Replace

∆

: Adjust

✩

: Lubricate

❏

: Shift position

(List of Replacement Parts)

1) Open the front door.

2) Remove the toner bottle.

1) Remove the toner bottle. (See “a. Toner bottle unit” in this section)

2) Open the process cover.

3) Remove the toner hopper unit.

4) Clean the shutter area.

AR-M550U/M550N (PM: 250K)

When 

calling 

250K 500K 750K 1000K 1250K 1500K 1750K 2000K

Remark

AR-620U/M620N (PM: 300k)

300K 600K 900K 1200K 1500K 1800K 2100K 2400K

Unit name  

No.

Part name

Developing 
section

1

Toner bottle

Assembly when 
installing/ 
Replacement by user 
when empty

2

Toner hopper

❍

❍

❍

❍

❍

❍

❍

❍

❍

Cleaning the shutter 
area

2

1

No.

Unit

Parts

a

Toner bottle unit

b

Toner hopper unit 

1

Toner sensor

2

Toner motor 1

c

Other

1

Toner motor 2

a

c-1

b-1

b-2

b