Sharp AR-M351U / AR-M451U (serv.man14) Service Manual ▷ View online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 49
(3) Image signal flow
The image signal converted into electric energy (analog signal) is
A-D converted on the CCD PWB. Image processes such as white
balance and shading correction are performed on the scanner
control PWB. The image signal is then sent through the mother
board to the MFP control PWB.
A-D converted on the CCD PWB. Image processes such as white
balance and shading correction are performed on the scanner
control PWB. The image signal is then sent through the mother
board to the MFP control PWB.
In the MFP control PWB, image process is performed according to
the setting content of the operation panel. The image data are
converted into laser lighting signals (VIDEO signals), and sent
through the mother PWB and the PCU to the LSU (Laser Scan
Unit).
the setting content of the operation panel. The image data are
converted into laser lighting signals (VIDEO signals), and sent
through the mother PWB and the PCU to the LSU (Laser Scan
Unit).
In the LSU, the VIDEO signals are converted into laser beams,
which are radiated onto the drum.
which are radiated onto the drum.
(4) Carriage (lamp unit) shift (scan) speed
The carriage scan speed depends on the copy magnification ratio.
Speed up to 171% = 110mm/s
Speed of 172% - 400% = 55mm/s
(5) Timing chart
Platen timing chart
SPF duplex timing chart
PSW
CCD
MHPS
MIMD
MM
Feed
Return
Home position
Home position
Scan
CCD
SPOD
CIS
SPPD4
SRRC
SPFM
1030mS
181mS
55mS
94mS
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 50
D. Maintenance and parts replacement
(1) Maintenance list
(2) Maintenance and parts replacement
Unit name
Part name
When
calling
100K 200K 300K 400K 500K 600K 700K 800K
Remark
Scanner
section
section
Mirror/Lens/Reflector/Sensors
❍
❍
❍
❍
❍
❍
❍
❍
❍
Table glass/Dust-proof glass/OC
❍
❍
❍
❍
❍
❍
❍
❍
❍
White reference glass
❍
❍
❍
❍
❍
❍
❍
❍
❍
Rails
✩
✩
✩
✩
✩
✩
✩
✩
Drive belt/Drive wire/Pulley
✕
✕
✕
✕
✕
✕
✕
✕
1
3
4
2
1
1
2
4
5
5
No.
Unit
Parts
a
Scanner unit
1
OC
❍
2
Dust-proof glass
❍
3
Table glass
❍
4
White reference glass
❍
5
Mirror
❍
6
Rails
✩
7
Drive wire
✕
8
Pulley
✕
9
Drive belt
✕
10
Scan motor
11
OC open sensor
12
Mirror home position sensor
13
Scanner control PWB
14
Scanner interface PWB
b
Lamp unit
1
Reflector
❍
2
Mirror
❍
3
Lamp
4
Inverter PWB
c
CCD lens
PWB unit
PWB unit
1
CCD lens
a-2
a-10
a-11
a-11
a-12
a-14
a-13
a-4
a-5
a-5
a-6
b-2
b-1
b
a-7
b-3
b-4
a-8
a-8
a-9
a-7
c
a-1
a-3
c-1
a-6
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 51
a. Scanner unit
a-1. OC
1) Remove the OC cover.
a-2. Dust-proof glass
a-3. Table glass
a-4. White reference glass
1) Remove the table glass holder and the white reference glass
holder, and remove the table glass and the white reference
glass.
glass.
a-5. Mirror
1) Remove the table glass.
2) Clean mirror.
a-6. Rails
1) Remove the table glass.
2) Grease up the rails.
a-7. Drive wire
a-8. Pulley
a-9. Drive belt
1) Remove the table glass.
2) Check the drive wire, pulley and drive belt.
a-10. Scan motor
1) Remove the scanner rear cabinet and the rear lower cabinet.
1)
1)
2)
3)
4)
3)
1)
2)
1)
3)
4)
4)
5)
6)
1)
1)
2)
3)
3)
4)
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 52
2) Pull out the harness from the scanner control PWB.
3) Remove the scan motor.
a-11. OC open sensor
1) Remove the rear cabinet.
2) Remove the OC open sensor.
a-12. Mirror home position sensor
1) Remove the rear cabinet.
2) Remove the mirror home position sensor.
a-13. Scanner control PWB
1) Remove the scanner rear lower cabinet.
2) Disconnect the connector and earth band, and pull out the
scanner control PWB.
∗
When the scanner control PWB is replaced, the EEPROM must
be replaced.
be replaced.
a-14. Scanner interface PWB
1) Remove the table glass.
2) Remove the PWB cover and the harness cover.
3) Remove the scanner interface PWB.
b. Lamp unit
1) Remove the table glass.
2) Remove the scan lamp unit.
1)
2)
3)
2)
3)
1)
1)
2)
3)
1)
1)
2)
2)
5)
3)
4)
1)
2)
3)
1)
2)
4)
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