MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 113

MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 63

 

This adjustment must be performed in the following cases:

* When the copy magnification ratio in the copy image sub 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.

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.

Go 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 (SUB) adjustment value of Simulation 48-1.

When the adjustment value is increased, the copy magnifica-
tion ratio in the sub scanning direction is increased.

When the adjustment value is changed by 1, the copy magnifi-
cation ratio is changed by about 0.1%.

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

 

This adjustment must be performed in the following cases:

* When the scan control PWB is replaced.

* When the EEPROM on the scan control PWB is replaced.

* When U2 trouble occurs.

* When the copy magnification ratio of the DSPF mode copy

image in the main scanning direction is not proper.

* When the DSPF is disassembled.

1)

Place the duplex adjustment chart shown below on the docu-
ment tray of the DSPF.

The adjustment chart is prepared by the following procedures.

Use A4 (11" x 8.5") paper, and put marks on both sides and
both surfaces of the paper at 10mm from each edge.

2)

Make a duplex copy at the normal ratio on A4 paper.

3)

Measure the images on the copy paper and the original
images.

4)

Obtain the image magnification ratio according to the following
formula:

Image magnification ratio = Original size / Original size x 100
(%)

Image magnification ratio = 99 / 100 x 100 = 99 (%)

If the image magnification ratio is within the specified range
(100 +/- 0.5%), there is no need to perform the adjustment.

If it is not within the specified range, perform the following pro-
cedures.

5)

Enter the SIM 48-1 mode.

10

20

90

100

110

10

20

90

100

110

10

20

90

100

110

(Example 1)
Copy A
(Shorter than
the original)

(Example 2)
Copy B
(Longer than
the original)

Scale
(Original)

Copy magnifi-
cation ratio

(Original dimension - Copy dimension)

Original dimension

100%

A

CCD(MAIN)

SCAN main scanning 
magnification ratio 
adjustment (CCD)

1 - 99

50

B

CCD(SUB)

SCAN sub scanning 
magnification ratio 
adjustment (CCD)

1 - 99

50

C

SPF(MAIN)

DSPF document front surface 
magnification ratio 
adjustment (Main scan)

1 - 99

50

A4 size

(Both the front surface 

and the back surface)

10mm

10mm

Paper pass direction

original

10

50

100

150

200

250

copy

10

50

100

150

200

250