MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 125

MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 75

 

Make sure followings are confirmed prior to the adjustment:

• Charge unevenness is not occurring

• A paper tray with A4 (LT) size papers is available.

• The auto correction of FR density uniformity will clear the correc-

tion value in “ADJ20B manual correction of FR density unifor-
mity”. Do not execute auto correction if you wish to maintain the
manual correction value.

• Execute Sim 61-13 if any one of DV unit, Drum Process unit and

LSU unit has been replaced.

 

This adjustment must be performed in the following cases.

• Ununiformed density toward main scan direction has been

observed

1)

Enter Simulation 61-11.

2)

Press [AUTO CORRECTION] key.

Press [DATA] to confirm present auto correction value.

3)

Select the density level to adjust and press [EXECUTE] key.

The adjustment pattern will be output.

* Default Mode: Middle

4)

Place the adjustment pattern in the step 3) and the arrows on
the adjustment pattern should be placed on left side (A4R/LTR
direction) on the document table. and press [EXECUTE] key.
Also put five blank sheets on top of the adjustment pattern.

5)

After scanning the adjustment pattern and the adjustment
result pattern will be printed automatically. Check whether den-
sity on front and rear side matches.

6)

Press [RETRY] and repeat the steps in 3) to 5), if the density
between front and rear is still unevenness with result in step 5).

NOTE: 1) As you repeat this procedure, the accuracy of this

adjustment will increase that expected to remedy the
color unevenness between front and rear.

2) [Setting the correction value back to default value
(for readjustment)]

Clear the adjustment by Sim 61-13 (Laser Power Auto/
Manual correction data clear). Make sure to execute
this adjustment again after the clearance.

7)

Execute Simulation 46-74 (Copy/Printer color balance adjust-
ment) after completing all the adjustments.

 

This adjustment must be performed in the following cases.

• Ununiformed density toward main scan direction has been

observed:

1)

Enter Simulation 61-12.

2)

Press [VISUAL INSPECTION] key.

Press [DATA] to confirm present manual correction value.

3)

Select the density level to adjust and press [EXECUTE] key.

The adjustment pattern will be output.

4)

Check the adjustment pattern in the step 3).

Select either [5 POINT CORRECTION] or [32 POINT COR-
RECTION], enter adjustment value and press [EXECUTE] key.

Larger the adjustment value, the higher the density and vice
versa.

5)

The adjustment result pattern will be printed automatically.

Check whether density on front and rear side matches.

6)

After step5) if you furthermore require this adjustment, press
[RETRY] key and repeat the step 3) to 5).

NOTE: [Setting the correction value back to default value (for

readjustment)]

Clear the adjustment by Sim 61-13 (Laser Power Auto/
Manual Correction Data Clear). Make sure to execute
this adjustment again after the clearance.

7)

Execute Simulation 46-74 (Copy/Printer color balance adjust-
ment) after completing all the adjustments.