MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 114

MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 64

6)

Select an adjustment item of SPF (MAIN)/SPFB (MAIN) with
the scroll key.

7)

Enter an adjustment value with 10-key, and press [OK] key.

When the adjustment value is increased, the image magnifica-
tion ratio is increased. When the adjustment value is changed
by 1, the image magnification ratio is changed by 0.02%.

8)

Make a normal copy and obtain the copy magnification ratio.

Repeat the procedures of 1) - 8) until a satisfactory result is
obtained.

 

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 sub scanning direction is not proper.

* When the DSPF is disassembled.

1)

Place the duplex adjustment chart shown below on the DSPF
document tray.

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.

6)

Select an adjustment item with the scroll key.

7)

Enter an image magnification ratio adjustment value with 10-
key, and press [OK] key.

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

When the adjustment value is changed by 1, the image magni-
fication ratio is changed by 0.1%.

8)

Make a normal copy and obtain the copy magnification ratio.

Repeat the procedures of 1) - 8) until a satisfactory result is
obtained.

 

 

This adjustment must be performed in the following cases:

* When the scanner (reading) section is disassembled.

* When the scanner (reading) unit is replaced.

* When a U2 trouble occurs.

* When the scanner control PWB is replaced.

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

1)

Make a copy of the adjustment chart (made by yourself) in the
adjustment mode (document table).

D

SPF(SUB)

DSPF document front surface 
magnification ratio 
adjustment (Sub scan)

1 - 99

50

E

SPFB(MAIN)

DSPF document back 
surface magnification ratio 
adjustment (Main scan)

1 - 99

50

SPF (MAIN)

Main scanning direction image magnification ratio 
(Front surface)

SPFB (MAIN)

Main scanning direction image magnification ratio 
(Back surface)

A4 size

10mm

10mm

Paper pass direction

original

copy

10

50

100

150

200

10

50

100

150

200

SPF (SUB)

Sub scanning direction image magnification ratio 
(Front surface)

SPFB (SUB)

Sub scanning direction image magnification ratio 
(Back surface)

B

A = B

A