MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 112

MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 62

7)

In the case of tandem tray

Loosen two red screws, and adjust the position of the paper
feed guide.

8)

In the case of paper feed tray 3/4

Loosen the paper feed tray off-center adjustment screws (2
pcs.) at the center section of the lift plate of the paper feed tray,
and change the gear unit position in the front/rear frame direc-
tion. Repeat the adjustment procedures from 4).

NOTE:

The adjustment item (SUB-XXX-HV-XXX) is used to make the fine
adjustment of heavy paper/OHP/envelopes for the adjustment item
(SUB-XXX) of each paper feed tray.

 

 

CAUTION: If the default adjustment value of the scan image magni-

fication ration adjustment (main scanning direction) of
SIM 48-1, copy image quality may be degraded. There-
fore, this adjustment must be executed only when there
is a special necessity.

This adjustment must be performed in the following cases:

* When the copy magnification ratio in the copy image main scan-

ning direction is not properly adjusted.

* When the scanner motor is replaced.

* U2 trouble has occurred.

* When the scanner control PWB is replaced.

* When the EEPROM of the scanner control PWB is replaced.

Before this adjustment, the focus adjustment (CCD unit installing
position adjustment) must have been completed.

1)

Place a scale on the document table as shown in the figure
below.

2)

Enter the SIM 48-1 mode.

3)

Make a normal copy and obtain the copy magnification ratio.

Press [CLOSE] key to shift from the simulation mode to the
copy mode, and make a copy.

4)

Check that the copy magnification ratio is within the specified
range (100 +/- 0.5%).

If the copy magnification ratio is within the specified range (100
+/- 0.5%), the adjustment is completed. If the copy magnifica-
tion ratio is not within the specified range, perform the follow-
ing procedure.

5)

Change the CCD (MAIN) adjustment value of Simulation 48-1.

When the adjustment value is increased, the copy magnifica-
tion ratio is increased.

When the adjustment value is changed by 1, the copy magnifi-
cation ratio is changed by about 0.02%.

Repeat the procedures 3) - 5) until the copy magnification ratio
is within the specified range (100 +/- 0.5%).