DOWNLOAD Sharp MX-6500N / MX-7500N (serv.man19) Service Manual ↓ Size: 5.74 MB | Pages: 98 in PDF or view online for FREE

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 77

 

This adjustment must be performed in the following cases:
* The DSPF paper feed tray section has been disassembled.
* The DSPF paper feed tray unit has been replaced.
* When a U2 trouble occurs.
* The scanner PWB has been replaced.
* The EEPROM on the scanner PWB has been replaced.
1) Enter the SIM 53-6 mode.

2) Open the DSPF paper feed guide to the maximum width posi-

tion.

3) Press [EXECUTE] key.

The maximum width detection level is recognized.

4) Open the DSPF paper feed guide to the width for the A4R size.
5) Press [EXECUTE] key.

The A4R width detection level is recognized.

6) Open the DSPF paper feed guide to the width for the A5R size.
7) Press [EXECUTE] key.

The A5R width detection level is recognized.

8) Open the DSPF paper feed guide to the minimum width posi-

tion.

9) Press [EXECUTE] key.

The minimum width detection level is recognized.

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

 

This adjustment must be performed in the following cases:
* When the original size sensor section has been disassembled.
* When the original size sensor section has been replaced.
* When U2 trouble has occurred.
* When the scanner control PWB is replaced.
* When the EEPROM on the scanner control PWB is replaced.

 

1)

Enter the SIM 41-1 mode.

Loosen the original cover switch actuator adjustment screw
and slide the actuator position so that the display OCSW is
returned to the normal display when the height of the arm unit
top from the table glass is 20.2 +/- 0.25mm by slowly tilting the
document detection arm unit in the arrow direction and adjust. 
(If the ON timing of the original cover switch is shifted, the doc-
ument detection function may malfunction.)

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MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 78

 

1) Enter the SIM41-2 mode.

2) Execute the sensor adjustment without document.

With the document cover open, without placing a document on
the table glass, press [EXECUTE] key.

3) Place A3 (11" x 17") paper on the document table and press

[EXECUTE] key.

If the adjustment is completed normally, "DOCUMENT SIZE
PHOTO SENSOR LEVEL IS ADJUESTED" is displayed.

 

This adjustment must be performed in the following cases:
* The operation panel 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)

Enter the SIM 65-1 mode.

2)

Precisely press the cross mark points (4 positions).
When the cross mark is pressed precisely, a buzzer sounds
and the display is reversed. When all the four points are
pressed and the touch panel adjustment is completed, the dis-
play returns to the simulation sub number entry screen.
In case of an error, the display returns to the entry screen
again.
Check to confirm that there is no shift between the display
frame and the detection position when the touch panel is
pressed.
* When pressing the touch panel, never use a sharp tip (such

as a needle or a pin).
 

 

Normally there is no need to perform this adjustment. In the follow-
ing cases, perform this adjustment.
* When a paper jam occurs in the fusing section.
* When wrinkles are made on paper in the fusing section.
* When an image deflection or an image blur is generated in the

paper rear edge section.

1)

Loosen the fusing paper guide fixing screws on the two posi-
tions in the front/rear frame direction.

2)

Use the fusing paper guide position scale as the reference to
shift the paper guide in the arrow direction A or B.
* Make sure to shift this paper guide parallel to the standard F/
R fixing position.

Adjustment completed

EXECUTE  

Adjustment
failed

EXECUTE

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MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 79

The standard fixing position is at 1 scale in direction B from the 
marking scale center. However, the position may be varied depend-
ing on the situation.

* When a wrinkle is made on paper, change the position in the

error direction A.

* When an image deflection or unclear image is generated in

the lead edge area of paper, change the position in the
arrow direction B.
 

 

NOTE:
Normally if the adjustment is executed by ADJ3 (automatic adjust-
ment), there is no need to execute this adjustment.
Only when the manual adjustment is required, execute this adjust-
ment.
In other words, this manual adjustment is executed when a satis-
factory result is not obtained from the automatic adjustment
(ADJ3).
 

 

This adjustment must be performed in the following cases:
* When the LSU (writing) unit is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1) Enter the SIM 50-10 mode.

2)

Set A4 (11" x 8.5") paper in the paper feed tray.

3)

Select the paper feed tray set in procedure 2) with the scroll
key and the numeral key.

4)

Press [EXECUTE] key.
The check pattern is printed out.

5)

Check that the inside dimension of the printed halftone is 240
+/- 0.5mm.

If the above requirement is not met, do the following steps.

6)

Change the set value of set item A.
When the set value is changed by 1, the dimension is changed
by 0.1mm.
When the set value is increased, the BK image magnification
ratio in the main scanning direction is increased. When the set
value is decreased, the BK image magnification ratio in the
main scanning direction is decreased.

Repeat procedures 2) - 6) until a satisfactory result is obtained.

 

This adjustment must be performed in the following cases:
* When the LSU is replaced or removed.
* When a paper tray is replaced.
* When the paper tray section is disassembled.
* When the manual feed tray is replaced.
* When the manual feed tray is disassembled.
* When the duplex mode paper transport section is disassembled.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.

NOTE: Before execution of this adjustment, be sure to execute the

print image manual magnification ratio adjustment
(ADJ15A) (main scanning direction) (print engine).

EXECUTE 

End of print

 

EXECUTE

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MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 80

1) Enter the SIM 50-10 mode.

2) Set A4 (11" x 8.5") paper to all the paper feed trays. Select an

adjustment item of the target paper feed tray among items B -
J and enter the adjustment value. Then select item "R" to
select the paper feed tray which is to be used for executing
test printing.

3) Press [EXECUTE] key.

The adjustment pattern is printed.

4) Check the adjustment pattern to confirm that the items below

are in the range of the standard values.

If the above condition is not satisfied, or if it is set to a desired
condition, execute the simulation 50-1.

NOTE: Feed paper from all the paper feed trays to confirm.

5)

Enter the SIM 50-1 mode.

6)

Select an adjustment item (DENA, DENB, FRONT/REAR) with
the scroll key, enter the adjustment value, and press [OK] key.

When the adjustment value is increased, the void area is
increased. When the adjustment value is decreased, the void
area is decreased.
When the adjustment value is changed by 1, the void area is
changed by 0.1mm.
NOTE:
The adjustment value and the actual void area are related as
follows:
Adjustment value/10 = Actual void area
NOTE:
When the amount of the rear edge void is different between
each paper feed tray, change the adjustment value of item
(DENB-XXX) in SIM50-1 and adjust.
The adjustment item (DENB) have a effect on the paper of all
paper feed tray.
That is, adjustment value of item (DENB-XXX) fine adjusts to
adjustment item (DENB) for each paper tray.

X

Lead edge void area

4.0 +/- 1.0mm

Y

Rear edge void area

2.0 - 5.0mm

Z1/Z2

FRONT/REAR void area

2.0 +/- 2.0mm

EXECUTE 

End of print

 

EXECUTE

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X

Y

Z2
2.0

4.0 1.0mm

2.0 - 5.0mm

Z1
2.0

2.0mm

2.0mm

Void area 
adjustment

DENA

Lead edge void area 
adjustment

1 - 99

40

DENB

Rear edge void area 
adjustment

1 - 99

30

FRONT/
REAR

FRONT/REAR void 
area adjustment

1 - 99

20

Sub 
scanning 
direction 
print area 
correction 
value

DENB-MFT

Manual feed 
correction value

1 - 99

50

DENB-CS1

Tray 1 correction value

1 - 99

50

DENB-CS2

Tray 2 correction value

1 - 99

50

DENB-CS3

Tray 3 correction value

1 - 99

50

DENB-CS4

Tray 4 correction value

1 - 99

50

DENB-LCC

LCC correction value

1 - 99

50

DENB-ADU

ADU correction value

1 - 99

55

DENB-HV

Heavy paper 
correction value

1 - 99

50

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