Sharp AR-M351U / AR-M451U (serv.man12) Service Manual ▷ View online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 25
a-3. Thermistor
1) Remove the fusing unit.
2) Remove the screw, and remove the fusing drawer. Remove
the connector.
3) Remove the screw, and remove the thermistor.
a-4. Lower heat roller
1) Remove the fusing unit.
2) Release pressure with the pressure adjustment lever.
3) Remove the screw, and open the fusing unit.
4) Open the fusing rear lower PG.
5) Remove the lower heat roller, and remove the lower heat roller
bearing.
a-5. CL roller
a-6. CL roller bearing
1) Remove the fusing unit.
2) Remove the lower heat roller.
3) Remove the CL roller, and remove the CL roller bearing.
a-7. Heater lamp
1) Remove the fusing unit.
2) Open the fusing unit.
3) Remove the screw, and remove the heater lamp.
∗
Be careful not to mistake the installing position of the heater
lamp.
lamp.
∗
When installing, loosen the screws on the front side
(drawer
ON side) then the screws on the rear side
(gear side) in this
sequence.
∗
Check to confirm again that the screws are tighten securely. (If
any screw is loosened, a bad contact may cause heating.)
any screw is loosened, a bad contact may cause heating.)
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 26
a-8. Upper heat roller
a-9. Upper heat roller gear
1) Remove the fusing unit.
2) Open the fusing unit.
3) Remove the fusing rear upper PG.
4) Remove the heater lamp.
5) Remove the upper heat roller, the roller stopper. The upper
heat roller gear, and the upper heat roller bearing.
a-10. Thermostat
1) Remove the fusing unit.
2) Open the fusing unit.
3) Remove the fusing rear upper PG.
4) Remove the heater lamp.
5) Remove the upper heat roller.
6) Remove the screw, and remove the electrode plate and the
thermostat.
∗
When installing, check to confirm that the screws are securely
tighten again. (If any screw is loosened, a bad contact may
cause heating.)
tighten again. (If any screw is loosened, a bad contact may
cause heating.)
3. Paper feed section
A. General
This section picks up paper in the cassette and feed it to the trans-
port roller section.
port roller section.
The capacity of the paper feed tray is 550 sheets for 64g/m
2
or
500 sheets for 80g/m
2
.
There are three kinds of the paper feed desk: 3-stage paper feed
desk (AR-D27), 2-stage paper feed desk (AR-D28), and 1-stage
paper fed desk (AR-MU2). For details, refer to the AR-D27/D28/
MU2 Service Manual.
desk (AR-D27), 2-stage paper feed desk (AR-D28), and 1-stage
paper fed desk (AR-MU2). For details, refer to the AR-D27/D28/
MU2 Service Manual.
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 27
B. Major parts and signal functions
+24V1
TRC\
LUMA
PED
CPFC\
PPD1
CSS
LUMB
LUD
RRC\
GND2
+5V2
GND2
+24V1
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
GND
19
20
GND2
+5V2
+5V2
GND2
21
22
23
24
+24V1
CFM1\
GND2
GND2
+24V1
CPFC\
1
PHNR-02-H+BU02P-TR-P-H
2
+24V1
2
1
GY
GY
BL
GY
RD
BL
GND2
+5V2
GND2
GND2
PED
+5V2
+5V2
LUD
PPD1
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
PHNR-09-H+BU09P-TR-P-H
BR
BR
BR
BR
BR
BR
BL
GY
BR
3
1
2
179228-3(AMP)
LUD
+5V2
GND2
GY
BR
BL
B24B-PHDSS-B
CN13
PED
179228-3(AMP)
+5V2
1
GND2
2
3
GY
GY
RD
BL
BL
BR
BR
BR
DSW-F
MM-T
GND2
+5V2
GND2
MM\
9604S-08C
1
2
3
4
5
6
7
8
CN9
DSW-F
GND2
DSW-L
MM-T
GND1
+5V2
GND2
MM\
DSW-L
GND1
8FE-ST-VK-N
8
7
6
5
4
3
2
1
MM
LUM
CPFC
OR
OR
LUMA
LUMB
CSS
1
2
3
4
S4B-PH-K-S
GND2
CSS
CSS PWB
2
1
LUMA
LUMB
173979-2
CN2
CN1
LUMA
LUMB
1
2
173979-2
GY
BR
BR
BR
PED
LUD
PCU PWB
2
3
1
1
4
6
3
2
Code
Signal
name
Name
Function/Operation
Type
Note
CPFC
CPFC
Paper feed clutch
Paper freed tray section roller ON/
OFF control
OFF control
Electromagnetic clutch
LUM
LUM
Paper feed tray lift-up motor Drives the lift plate of the paper feed
tray.
DC brush motor
Selection of Rotation
mode/ Brake mode
mode/ Brake mode
PED
PED
Defector
Paper empty detection
LUD
LUD
Defector
Paper tray upper limit detection
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 28
C. Operational descriptions
[Paper feed operation]
(1) Preliminary operation except for the manual feed
tray
1) Load paper and insert the tray, and the tray sensor will be
turned on.
2) The lift-up motor rotates.
3) The upper limit sensor turns on.
(2) Paper feed operation
1) The take-up roller descends.
2) The take-up roller rotates to feed paper.
3) At the same time the paper feed roller rotates to feed paper to
the transport section.
4) At that time, the separation roller rotates to prevent against
overlapped feed.
[Paper size detection]
(1) Paper width detection VR (MPT/BPT/Machine tray)
Width detection is performed by calculating the voltage (A/D con-
version value) of the slide VR in linkage with the side guide plate.
version value) of the slide VR in linkage with the side guide plate.
Paper width and paper size
(The range is set to Standard value ± 6 [mm].)
(2) Paper length sensor
(MPT/2nd and 3rd steps of 3-step paper feed desk)
Length detection is performed by combination of cassette size
sensors 1 - 4.
sensors 1 - 4.
Paper length and paper size
Name
Function
Remark
1
Take-up roller
Picks up paper and transports it to the paper feed roller.
2
Paper feed roller
Feed paper in the machine.
3
Separation roller
Rotates simultaneously with the paper feed roller to prevent against overlapped feed.
For the manual feed tray, the separation pad is used instead of the roller.
For the manual feed tray, the separation pad is used instead of the roller.
4
Paper upper limit sensor
Detects the top surface of paper and stops paper at the feed position.
Except for BPT
5
Paper sensor
Detects paper presence.
(Paper empty, upper limit detection: ON / Paper presence detection: OFF)
(Paper empty, upper limit detection: ON / Paper presence detection: OFF)
6
Lift-up motor
Lifts the paper feed base up to the paper feed position (upper limit detection position).
Except for BPT
Width detection
pattern
Paper size
Standard
value (mm)
Range (mm)
A
A3/A4
297.0
303.0- 291.0
B
WLT/LT
279.4
285.4 - 273.4
C
B4/B5
257.0
263.0 - 251.0
D
LG/LTR/Foolscap
215.9
221.9 - 209.9
E
A4R
210.0
216.0 - 204.0
F
Executive-R
184.1
190.1 - 178.1
G
B5R
182.0
188.0 - 176.0
CSS2
CSS1
CSS3
CSS4
Vertical size
detection pattern
Detection SW status
AB series
size
Inch series
size
Detection width
range
Same range
size
CSS1
CSS2
CSS3
CSS4
1
ON
ON
OFF
ON
B5
EXTRA
147.0 - 198.0
Postcard
Monarch
2
OFF
ON
OFF
ON
A4
LT
198.0 - 237.0
DBL P/C
C5
DL
DL
3
OFF
ON
ON
ON
B5R
EX-R
237.0 - 274.0
COM-10
ISO-B5
4
OFF
OFF
ON
ON
A4R
LTR
274.0 - 314.0
5
ON
OFF
ON
ON
Foolscap
Extra
314.0 - 347.0
6
ON
OFF
ON
OFF
B4
LGL
347.0 - 389.0
7
ON
ON
ON
OFF
A3
WLT
389.0 - 432.8
0
OFF
OFF
OFF
OFF
Tray not installed
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