Sharp AR-M351U / AR-M451U (serv.man11) Service Manual ▷ View online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 14
D. Maintenance and parts replacement
(1) Maintenance list
(2) Maintenance and parts replacement
a. Transfer roller unit
1) Pull out the left door.
2) Remove the transfer lock pawl, and pull out the transfer roller
unit.
a-1. After-transfer star ring
1) Remove the transfer roller unit.
2) Remove the transfer rear star ring.
Unit name
No.
Part name
When
calling
100K
200K
300K
400K
500K
600K
700K
800K
Remark
Transfer
1
Transfer roller
✕
✕
▲
✕
▲
✕
▲
✕
▲
2
Discharge plate
✕
✕
▲
✕
▲
✕
▲
✕
▲
3
TR bearing (F/R)
✕
✕
✕
▲
✕
✕
✕
▲
4
Transfer roller collar
✕
✕
✕
▲
✕
✕
✕
▲
5
After-transfer star ring
✕
✕
✕
✕
✕
✕
✕
✕
6
TR gear
✕
✕
▲
✕
▲
✕
▲
✕
▲
1
3
6
4
2
3
4
5
No.
Unit
Parts
a
Transfer roller unit
1
After-transfer star ring
✕
2
Discharge plate
✕
3
Transfer roller
✕
4
Transfer roller collar
✕
5
TR bearing (F/R)
✕
6
TR gear
✕
a-5
a-2
a-1
a-4
a-5
a-3
a
a-4
a-6
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 15
a-2. Discharge plate
1) Remove the transfer roller unit.
2) Remove the screw, and remove the discharge plate holder
and the discharge plate.
a-3. Transfer roller
a-4. Transfer roller collar
a-5. TR bearing (F/R)
a-6. TR gear
1) Remove the transfer roller unit.
2) Remove the screw, and remove the discharge plate holder
and the discharge plate.
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 16
[Developing section]
A. General
In this section, toner is attached to electrostatic latent images
formed by laser beams on the OPC drum, making visible images.
formed by laser beams on the OPC drum, making visible images.
B. Major parts and signal functions
TCS
HUS-DV
TH-DV
TH-DV
2
3
3
1
TCS
HUS-DV
TH-DV
TH-DV
TM1
DM
HUS-DV
TCS
+24V1
GND2
+5V2
DVBias
QR/P8-12S-C(01)
5
6
7
8
1
6
7
8
GND2
TCS
+24V1
1
2
3
2
+5V2
1
Bias
10
11
12
10
11
12
9
9
HUS-DV
3
ZHR-4
GND2
Bias
4
(NC)
51021-0400
3
4
1
2
2
3
4
5
DVCH1
DVCH2
DVCH3
GY
GY
RD
BL
BR
BR
GY
RD
BL
BR
WH
GY
TH-DV
GND2
BR
BR
BR
BR
BR
BR
4
TH-DV
GND2
GY
BR
WH
#187
CN8
7
1
2
3
4
5
6
8
9
10
11
+5V2
TCS
GND2
DVCH3
GND2
+24V1
DVCH1
GND2
DVCH2
HUS-DV
B11B-PH-K-S
TH-DV
SRA-21T-3
2
CN7
TMB
TMA
1
173981-2
BK
BK
1
2
3
4
5
6
7
8
CN5
+24V1
CRUCLK
+5VCRU
GND2
CRUSDA
PSPS\
(NC)
B8B-PH-K-S
BR
GY
BL
BR
+24V1
PCU PWB
DM-T
GND2
DM\
1
2
3
4
5
6
7
8
CN6
GND2
DSW-F
DSW-F
DMCLK\
9604S-08C
(NC)
1
3
Code
Signal
name
Name
Function/Operation
Type
Note
HUS-DV
HUS-DV
Developing humidity sensor
Developing section peripheral humidity
detection
detection
Humidity sensor
Analog detector
TH-DV
TH-DV
Developing temperature
thermistor
thermistor
Temperature detection around the
developing unit
developing unit
Thermistor
Analog
TCS
TCS
Toner density sensor
Toner density detection
Magnetic sensor
Analog detector
DM
DM
Drum motor
Drives the drum/developing section.
DC brushless motor
TM1
TM
Toner motor
Drives the toner hopper.
Synchronous motor
Bias
Bias
Developing bias
High voltage for developing bias
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 (MX roller)
Mixes developer (carrier and toner) and charges toner negatively.
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 17
C. Operational descriptions
Electrostatic latent images formed on the OPC drum by the LED
(writing) unit (LED image light) are converted into visible images
by toner.
(writing) 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 fric-
tion.
tion.
The developing bias voltage (negative) is applied to the develop-
ing roller.
ing roller.
Negatively charged toner is attracted and attached to the area on
the OPC drum where negative voltage is reduced by exposure.
the OPC drum where negative voltage is reduced by exposure.
On the other hand, the negative voltage at an area where expo-
sure is not made is higher than the developing bias voltage, and
toner is not attached.
sure is not made is higher than the developing bias voltage, and
toner is not attached.
Aluminum
layer
CGL
CTL
Drum
-500V
(-470V)
(-470V)
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