AR-M550 (serv.man14). (7) Settings and adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 43

AR-M550/M620  SETTING AND ADJUSTMENTS  7 - 43

This adjustment is needed in the following situations: 

• The original size sensor section has been disassembled. 

• The original size sensor section has been replaced. 

• U2 trouble has occurred. 

• The scanner control PWB has been replaced.

• The EEPROM on the scanner control PWB has been replaced.

1) Go through the modes specified in Simulation 41-1.

2) Gradually turn over the original detection arm unit in the arrow

direction, and loosen the original cover switch actuator adjusting
screw so that the OCSW indicator changes from inverse video to
normal video when the arm unit top reaches a height of 32±0.5mm
from the table glass. Then move the actuator to adjust its position.
(If the original cover switch turns on in improper timing, the original
detection mechanism mail fail to operate correctly.)

1) Go through the modes specified in Simulation 41-2.

2) Open the original cover. With nothing placed on the original table,

select NO ORIGINAL using the numeric keypad. 

3) Press the Start key

This sets the sensor level with no original detected. 

4) Set A3 (11" x 17") paper on the original table, and select A3 ORIG-

INAL using the numeric keypad. 

5) Press the Start key

This sets the sensor level with an original detected. 

When each of the above operations has been completed, the "COM-
PLETE" message appears; when any of the operations has failed, the
"ERROR" message appears.

This adjustment is needed in the following situations: 

• The operation panel has been replaced. 

• U2 trouble has occurred. 

• The MFP control PWB has been replaced.

• The EEPROM on the MFP control PWB has been replaced.

1) Go through the modes specified in Simulation 65-1. 

2) Press the four cross mark points. 

Pressing the cross mark points correctly results in gray display. When
the touch panel adjustment is complete with the four points pressed,
the sub-number entry screen for simulation reappears. 

If any error is detected, the touch panel returns to adjustment mode. 

Note: Never use something with a sharp tip (such as a needle or pin)

to press the touch panel.

SIMULATION 41-1

PD SENSOR CHECK..

OCSW  

PD1

  

PD2

  

PD3

  PD4  PD5  PD6  PD7

32  5mm

+

-

Original detection
arm unit

Table glass

Original cover switch actuator

Select 2 and press [START] key. 
(Error)

Press [CUSTOM SETTINGS] 
key.

SIMULATION 41-2

PD SENSOR ADJUSTMENT. SELECT1-2, AND PRESS START.

(PLEASE OPEN THE ORIGINAL COVER.) 

1. NO ORIGINAL

2. A3 ORIGINAL

1

SIMULATION 41-2

Press [CUSTOM SETTINGS] key. 

Select 1 and 
press [START] key. 

PD SENSOR ADJUSTMENT.

NO ORIGINAL ··· COMPLETE (or "ERROR at 

PD1 PD2

...")

A3 ORIGINAL ··· INCOMPLETE

SIMULATION 41-2

PD SENSOR ADJUSTMENT.

NO ORIGINAL ··· COMPLETE

A3 ORIGINAL ··· COMPLETE (or "ERROR at 

PD1 PD2

...")

SIMULATION 65-1