Sharp AR-M550 (serv.man12) Service Manual ▷ View online
AR-M550/M620 DETAILS OF EACH SECTION 6 - 68
b-1. Toner sensor
1) Remove the toner hopper unit. (See “b. Toner hopper unit” in this
section)
2) Remove the cover.
3) Remove the toner sensor.
b-2. Toner motor 1
1) Remove the toner hopper unit. (See “b. Toner hopper unit” in this
section)
2) Remov the toner motor 1.
c-1. Toner motor 2
1) Remove the toner bottle. (See “b. Toner hopper unit” in this sec-
tion)
2) Remove the toner hopper unit. (See “b. Toner hopper unit” in this
section)
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
[Developer tank section]
A. General
In this section, toner is attached to electrostatic latent images formed
by laser beams on the OPC drum, making visible images.
by laser beams on the OPC drum, making visible images.
B. Major parts and signal functions
Code
Signal
name
Name
Function/Operation
Type
Model
Note
HUS-DV
HUS-DV
Developing humidity sensor
Developing section peripheral humidity
detection
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
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
+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
DVCH2
DVCH3
GND2
DV-Bias
GND2
TCS
GND2
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
+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
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
14
15
16
+38V
+38V
GND1
GND1
GND1
+38V
GND1
CN-5
B16B-PADSS-1
B16B-PADSS-1
1
2
3
5
1
3
2
5
4
14
17
16
15
CN-15
/DVPWM
/DVREM
HVREM
+24V1
/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.
AR-M550/M620 DETAILS OF EACH SECTION 6 - 70
C. Operational descriptions
Electrostatic latent images formed on the OPC drum by the LED (writ-
ing) unit (LED image light) are converted into visible images by toner.
ing) unit (LED image light) are converted into visible images by toner.
Toner in the developing unit is stirred by the mixing roller.
When toner is stirred, it is negatively charged by mechanical friction.
The developing bias voltage (negative) is applied to the developing
roller.
roller.
Negatively charged toner is attracted and attached to the area on the
OPC drum where negative voltage is reduced by exposure.
OPC drum where negative voltage is reduced by exposure.
On the other hand, the negative voltage at an area where exposure is
not made is higher than the developing bias voltage, and toner is not
attached.
not made is higher than the developing bias voltage, and toner is not
attached.
Aluminum
layer
CGL
CTL
-500v
+150v
Cleaning
mode
mode
Developing
mode
mode
Drum
AR-M550/M620 DETAILS OF EACH SECTION 6 - 71
D. Maintenance and parts replacement
(1) Maintenance list
✕
: Check (Clean, replace, or adjust as necessary.)
❍
: Clean
▲
: Replace
∆
: Adjust
✩
: Lubricate
❏
: Shift position
(2) Maintenance and parts replacement
(List of Replacement Parts)
a. Developing unit
1) Take out the developing tank.
a-1. Developer
1) Take out the developing tank. (See “a. Developing unit” in this sec-
tion)
2) Remove the DV cover.
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
section
1
Developer
▲
▲
▲
▲
▲
▲
▲
▲
Supply when
installing
installing
2
DV seal
▲
▲
▲
▲
▲
▲
▲
▲
3
MG holder F/R
❍
❍
❍
❍
❍
❍
❍
❍
❍
4
Side seal F/R
▲
▲
▲
▲
▲
▲
▲
▲
4
4
3
1
2
3
No.
Unit
Parts
a
Developing unit
1
Developer
▲
2
DV seal
▲
3
MG holders F and R
❍
4
Side seals F and R
▲
5
Toner concentration sensor
a-3
a-3
a-5
a-4
a-4
a-1
a
a-2
2
1
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