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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

AR-M550/M620  DETAILS OF EACH SECTION  6 - 68

1) Remove the toner hopper unit. (See “b. Toner hopper unit” in this

2) Remove the cover.

3) Remove the toner sensor.

1) Remove the toner hopper unit. (See “b. Toner hopper unit” in this

2) Remov the toner motor 1.

1) Remove the toner bottle. (See “b. Toner hopper unit” in this sec-

2) Remove the toner hopper unit. (See “b. Toner hopper unit” in this

3) While pressing the bottle coupling, turn it 90 degrees to the left and

remove it. Remove the spring.

4) Disconnect the connector, and remove the toner motor unit.

5) Remov the toner motor 2.

AR-M550/M620  DETAILS OF EACH SECTION  6 - 69

In this section, toner is attached to electrostatic latent images formed
by laser beams on the OPC drum, making visible images.

Code

Signal 

name

Name

Function/Operation

Type

Model

Note

HUS-DV

HUS-DV

Developing humidity sensor

Developing section peripheral humidity 
detection

Humidity sensor

Analog detector

TCS

TCS

Toner density sensor

Toner density detection

Magnetic sensor

Analog detector

TH-DV

TH-DV

Developing temperature sensor

Developing section temperature detection Thermistor

Analog detector

DVM

DVM

Developing motor

Drives the developing section.

DC brushless motor

Bias

Bias

Developing bias

High voltage for developing bias

12

11

10

9

8

7

6

5

4

3

2

1

13
14
15
16
17
18

B18B-PHDSS-B

CN-6

GND2

/DM

DMCLK

DM-T

+5V2

GND2

/DVM

DVMCLK

DVM-T

+5V2

GND2
+5V2
/FUM
FUMCLK
FUM-T
+24V1

GND2

/VFM-BKR

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

4

3

2

1

4

3

2

1

PCU PWB

AC PWB

HV

GND2

DVCH1
DVCH2
DVCH3

GND2

DV-Bias

GND2

TCS
GND2

DVCH4

TCS

GND2

(NC)

(NC)

(NC)

+24V1

HUS-DV

+24V1

51021-0400

DEVELOPER UNIT

DVM

HUS-DV 

TH-DV

TCS

DRAWER

+5V2

Bias

PS-187(GR)

DVREM

CN1

TH-DV

TSGOUT

TH-DV

(NC)

(NC)

(NC)

TSGOUT

TH-DV

+5V2

HUS-DV

GND2

ZHR-4

GND2

HUS-DV

MPRD2

GND2

+5V2
+5V-MPRD2

MPRD1

+5V-MPRD1

GND2

TSGOUT

GND2

TCS

+24V1

GND2

PPD

+5V2

DVCH4

DVCH3

DVCH2

DVCH1

+24V1

/PSBC

+24V1

+24V1

/T2PFC

+24V1

/HPFC

CN-12
B30B-PHDSS-B

SRA-01T-3.2

QR/P8-20S-C(01)/QR/P8-20P-C(01)

/HPLS

5

4

3

2

1

2

1

+38V

GND1

GND2

/DVM

DVMCLK

DVM-T

B2PS-VH

S5B-PH-K-S

+5V2

11

10

12
14
15
16

+38V

+38V
GND1

GND1

+38V

GND1

CN-5
B16B-PADSS-1

1

2

3

5

1

3

2

5

4

14

17

16

15

CN-15

/DVPWM
/DVREM
HVREM
+24V1

B34B-PHDSS-B

No.

Name

Operation

1

Developing roller

Forms magnetic brush with developer and put toner on the OPC drum.

2

DV doctor

Keeps the height of the magnetic brush on the developing roller at a fixed level.

3

Mixing roller

Mixes developer (carrier and toner) and charges toner negatively.

4

DV earth plate

Earth plate for DV unit

5

AG roller

Mixes toner supplied from the toner hopper, and supplies toner to the DV box evenly.