MX-2640N, MX-2640NR, MX-2640FN, MX-3140N, MX-3140NR, MX-3140FN, MX-3640N, MX-3640NR, MX-3640FN (serv.man9). Service Manual Revised June 2014. - Sharp Copying Equipment Service Manual (repair manual). Page 114

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MX-3640N  ADJUSTMENTS AND SETTINGS  5 – 71
 
11-B
RSPF paper feed tray document size (width) 
sensor adjustment
This adjustment must be performed in the following cases:
* The RSPF paper feed tray section has been disassembled.
* The RSPF paper feed tray unit has been replaced.
* When a U2 trouble occurs.
* The scanner PWB has been replaced.
* The EEPROM on the scanner PWB has been replaced.
1) Enter the SIM 53-6 mode.
2) Open the RSPF paper feed guide to the maximum width posi-
tion.
3) Press [EXECUTE] key.
The maximum width detection level is recognized.
4) Open the RSPF paper feed guide to the width for the A4R size.
5) Press [EXECUTE] key.
The A4R width detection level is recognized.
6) Open the RSPF paper feed guide to the width for the A5R size.
7) Press [EXECUTE] key.
The A5R width detection level is recognized. 
8) Open the RSPF paper feed guide to the minimum width posi-
tion.
9) Press [EXECUTE] key.
The minimum width detection level is recognized.
* When  each  of the  above  operations  has been complete d,  the
"COMPLETE"  message  appears;  when  any  of  the  operations
has failed, the "ERROR" message appears.
 
ADJ 12
Document size detection 
adjustment
This adjustment must be performed in the following cases:
* When the original size sensor section has been disassembled.
* When the original size sensor section has been replaced.
* When U2 trouble has occurred.
* When the scanner control PWB is replaced.
* When the EEPROM on the scanner control PWB is replaced.
 
12-A
Document size sensor detection point 
adjustment
1) Enter the SIM 41-1 mode.
Loosen  the or iginal  cover  switch actuator   adjustment scr ew
and  slide the   actuator  position  so that t he  display OCSW  is
returned to the normal display when the height of the arm unit
top from the table glass is 20.2  0.25mm by slowly tilting the
document detection arm unit in the arrow direction and adjust. 
(If the ON timing of the original cover switch is shifted, the doc-
ument detection function may malfunction.)
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