DOWNLOAD Sharp MX-M623U / MX-M753U (serv.man7) Service Manual ↓ Size: 13.53 MB | Pages: 104 in PDF or view online for FREE

MX-M753N  MX-M623N/M623U/M753N/M753U  1 – 6

1)

Pull the knob on the left door to pull out the left door.

2)

Turn the pressing screw in the fusing section as shown in the
figure below (fully loosen them) to press the heat rollers
together.

3)

Remove the separation pawl fixing block from the process unit.

4)

Replace the left door.

1)

Open the front cabinet.

2)

Loosen the blue screw of the process cover, and tilt down the
process cover toward you.

3)

Loosen the blue screw which is fixing the developing unit.

4)

While pressing the developing unit lock lever, pull out the
developing unit.
Hold the strap of the developing unit and remove the develop-
ing unit.

5)

Remove the screws and remove the DV cover.

2

1

2

1

MX-M753N  MX-M623N/M623U/M753N/M753U  1 – 7

6)

While supplying developer to the developer supply port of the
developing unit, turn the MG gear clockwise with a plus screw-
driver to supply all developer to the developing unit.

NOTE: When supplying developer, do not touch the MG roller with

bare hands.

7)

Install the DV cover to the developing unit.

8)

Insert the developing unit to the main unit and fix it with the
blue screw.

9)

Close the process cover and fix it with the blue screw.

1)

Remove the toner cartridge from the box, and shake it several
times horizontally.

NOTE: Be sure to shake the toner cartridge horizontally.

NOTE: Be careful not rotate as shown in the figure below.

2)

Insert the toner cartridge into the main unit insertion port as
shown below. In this case, do not turn the cartridge.

3)

Insert the toner cartridge until it is locked.

Insert the power plug into the power outlet. With the front cabinet
open, turn on the power switch of the main unit.
1)

Enter the SIM 25-2 mode.

2)

Close the front cabinet.

3)

Press [EXECUTE] key to execute the simulation. Toner is
stirred for 3 minutes. The average level of the sensor detection
level is set (stored) as the reference toner density control
value.

1)

Pull out the tray 3 or the tray 4.

2)

Hold and slide the fixing knob (slide system) of the partition
plates A and B to fit with the size of paper to be supplied.

3)

Supply paper into the tray.

4)

Push the tray.

NOTE: Note that a certain special paper cannot be used for tray 4.

To use special paper, use tray 3.

To use tab paper, install the exclusive-use guide tray 3. 
Note that tray 4 cannot be used.
1)

Remove the exclusive-use guide from the storage position left
inside of the machine.

MX-M753N  MX-M623N/M623U/M753N/M753U  1 – 8

2)

Pull out tray 3.

3)

Slide the partition plate to tab paper as shown in the figure
below and install it so that it covers the partition plate.

4)

Supply tab paper with the print face up into tray 3.

5)

Push in tray 3.

When you change the paper in a tray, the tray settings in the sys-
tem settings must also be changed.
1)

Press the [SYSTEM SETTINGS] key.

2)

Configure the tray settings in the touch panel.
Touch the [Paper Tray Settings] key.

3)

Touch the [Tray Settings] key.

4)

Touch the [Change] key in “Tray 1”.

5)

Select [Recycled] from the “Type” select box.

6)

Make sure that [Auto-Inch] is selected in the “Size” select box.

7)

Touch the [OK] key.
The above steps change the paper settings for tray 1 to 8-1/2”
x 11” recycled paper.

1)

Install the operation manual storage cover to the rear cabinet.

Check to insure that the cable connected to the service terminal (A
in the figure below) is 3m or less.

SYSTEM

SETTINGS

Admin Password

Exit

Total Count

Paper Tray

Settings

p

Printer Condition

Settings

Document Filing

Control

Address Control

Fax Data

Receive/Forward

USB-Device Check

Default Settings

List Print

(User)

System Settings

System Settings

Paper Tray Settings

Back

Tray Settings

Paper Type Registration

Auto Tray Switching

Custom Size Registration (Bypass)

Back

Change

Fixed Paper Side

Disable Duplex

Disable Staple

Disable Punch

Type

Paper Property

Feeding Approved Job

Plain

8-1/2x14

Tray Settings

Size

Tray 1

Copy

Print

Fax

I-Fax

Doc. Filing

OK

Cancel

System Settings

Tray Settings

Tray:

Type:

Size:

Paper Property:

Tray 1

Recycled

8-1/2x11

Print

Copy

I-Fax

Fax

216x330(8 1/2x13)
A3,A4,A4R,B4,B5,B5R,

(A)

MX-M753N  MX-M623N/M623U/M753N/M753U  1 – 9

1)

Reciprocate the MC cleaner shaft back and forth to clean the
electrode tip.

Used to set the specifications with SIM26 according to the cus-
tomer's request.

To customize the following items after completion of the destination
setup, change the set values.

NOTE: Before checking the copy density and gradation, be sure to

execute the following jobs.

* Execute the high density image correction (Process correction)

forcibly. (SIM 44-6)

* Execute the half-tone image correction forcibly. (SIM 44-26)
(Method)
Make a copy of the gray test chart (UKOG-0162FCZZ), and check
that it is proper.
Note for checking the copy mode density
To check the density, use the gray test chart (UKOG-0162FCZZ).
Set the copy density level to “Manual 3” in the Text/Printed Photo
mode (Manual).
In addition, all the picture quality adjustment settings in the user
adjustment mode must be set to the default (center).

[Check with the gray test chart (UKOG-0162FCZZ)]
In the copy density check with the gray test chart, check to insure
the following conditions.

[Check with the servicing color test chart (UKOG-0317FCZZ/
UKOG-0317FC11 or UKOG-0326FCZZ/UKOG-0326FC11)]
Check to confirm that it is in the conditions shown below.

If no printer option is installed to the U model, the following proce-
dures are not required. (SIM64-5 does not operate.)

NOTE: Before checking the printer density and gradation, be sure

to execute the following jobs.

* Execute the high density image correction (Process correction)

forcibly. (SIM 44-6)

* Execute the half-tone image correction forcibly. (SIM 44-26)
(Method 1)
Execute SIM 64-5 to print the print test pattern.
Set each set value to the default and press [EXECUTE] key. The
print test pattern is printed.

The print density must be changed gradually from the lighter level
to the darker level. The density changing direction must not be
reversed.

26

6

Used to set the destination.

26

2

LCC paper size setting

3

Used to set the auditor specification mode.

5

Used to set the count mode of the total counter and the 
maintenance counter.

18

Used to set YES/NO of the toner save mode 
(Only in UK and Japan versions)
* For other destination versions, this setup is made by 

the user program.

52

Used to set YES/NO of counting when non-print paper 
is passed through each counter.

53

Used to set YES/NO of user calibration permission.

65

Used to set the limit number of sheets for stapling.

1

2

3

4

5

6

7

8

9

10

W

SHARP GRAY CHART

SHARP gray chart

Patch 1 is not copied.

Patch 2 is
slightly copied.

Patch 3 is copied.

Serviceman chart (Color patch section)

Patch 7 is slightly
copied or not copied.