AR-M351U, AR-M451U (serv.man14). Maintenance details of following sections, 5-Laser Scanner, 6-Scanner, 7-DSPF, 8-Operation Panel - Sharp Copying Equipment Service Manual (repair manual). Page 22

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AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 64
C. Maintenance and parts replacement
a. Original detection unit
a-1. Original size detection PWB (Light emitting side)
1) Remove the rear cabinet. 
2) Remove the original detection unit (Light emitting side).
3) Remove the document size detection PWB (Light emitting
side)
a-2. Original size detection PWB (Light receiving side)
1) Remove the operation panel lower cabinet. 
2) Remove the original size detection PWB (Light receiving side)
b. Operation panel unit
1) Remove the original exit tray.
Code
Signal 
name
Name
Function/Operation
Type
Note
LCD
LCD unit
Display the each memu and the information.
TOUCH
Touch panel
Various adjustments and setting operation are 
performed.
ORSLED
Document size detection light 
emitting PWB
Generates the document size detection signal.
ORSPD
Document size detection light 
receiving PWB
Generates the document size detection signal.
OCSW
OCSW
SPF open/close detector
Document size detection trigger
Transmission type Sensor
/CCFT
/CCFT
LCD backlight
LCD backlight
CCFT cool CRT
No.
Name
Function
1
LVDS/INV PWB
Generates the LCD display signal and a high voltage for the backlight. 
2
Operation control PWB
Controls the display operation panel. 
No.
Unit
Parts
a
Original detection 
unit
1
Original size detection PWB 
(Light emitting side)
2
Original size detection PWB 
(Light receiving side)
b
Operation panel 
unit
1
LVDS PWB
2
MFP operation PWB
a-1
b-2
b-1
a-2
b
1)
2)
3)
4)
1)
1)
1)
2)
3)
3)
2)
1)
2)
2)
1)
2)

Display

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