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 – 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.

MX-M753N  MX-M623N/M623U/M753N/M753U  1 – 10

(Method 2)
Execute SIM 67-25 to print the adjustment check pattern.

The print density must be changed gradually from the lighter level
to the darker level. The density changing direction must not be
reversed.
Patch A or B is slightly copied.

Check that the following operations are normal.

Print the various setup data and the adjustment data (list) with
SIM22-6 and keep the data.
• In case of a memory trouble, if the data are not kept, all the

adjustments must be made again.

• If the data are kept, the setup values and the adjustment values

can be entered without adjustments, shortening the servicing
time.

1)

If the following options are installed, remove all of them from
the machine.
• Finisher
• Large capacity tray

2)

Remove the following consumable parts from the machine.
• Paper
• Toner cartridges
• Development cartridge

3)

Lock the following sections.
• Scanner (Optical section)
• Paper cassette lift plate

4)

Remove the adjuster cover, and lift the adjuster.

NOTE: Since the hard disk drive is built in the machine, use care

not to exert vibrations or shocks to the machine when in
transit.

There are two USB ports; one on the front frame side and the other
on the rear frame side. Only one of them can be used at a time. Do
not connect the two USB ports simultaneously.
When shipping, the port on the front frame side is valid and the port
on the rear frame side is invalid. When using the USB port, be care-
ful of the total current consumption not to exceed 500mA.
The valid port can be switched by changing the setting of the MFP
PWB DIP SW.
Select the valid USB port according to the user’s request.
* The default setting for SW1/SW2 is OFF.

NOTE: After completion of option installation, revise all the firm-

ware to the latest version.

Key-in (operation panel)
Display (operation panel)
Paper feed 
operation

Hand feed
Main unit paper 
tray
Desk unit paper 
feed tray

With the desk unit installed

Paper size detection
Originals size 
detection

Original table 
mode
DSPF mode
RSPF mode

DSPF/RSPF 
operation / two 
sided copy

S-S mode
D-S mode
S-D mode
D-D mode

Bookbinding operation

When the finisher is installed

Stapling operation

When the finisher is installed

Grouping operation

When the finisher is installed

Sorting operation

When the finisher is installed

Paper exit operation

When the exit tray unit (MX-TRX2) 
is installed

Q (Max)

A B C D E F G H I J K L M N O P

Patch A or B is slightly copied.

High density

Low density

The patch density is identical between patches or not reversed.
The patch density is changed gradually.

OFF

OFF

Valid

Invalid

OFF

ON

Invalid

Valid

Upper side: DIP-SW1
Lower side: DIP-SW2
When tilted toward you: OFF
When tilted to the PWB side: ON

MX-M753N  MX-LC10  2 – 1

MX-M753N

Service Manual

 

1)

Pull out the large capacity tray (A4) unit and packing parts.

1)

Remove the fixing material from the large capacity tray.

2)

Gently pull out the large capacity tray until it stops.
The large capacity tray until it stops.

3)

Remove the paper feed base fixing screw (1 pc.) of the large
capacity tray.
* Before turning on the power, check to insure that the fixing

screw of the tray is removed. If the power is turned on with-
out removing the fixing screw, a trouble code will be dis-
played and may cause damage to the lift up mechanism.

4)

Push the large capacity tray slowly into the original position.

MX-M753N  MX-LC10  2 – 2

1)

Check that all the items are included in the package.

<Note before installation>
* Start installation after checking that the LINE indicator and the

DATA indicator below it on the operation panel are neither lit nor
blinking.

This is to ensure that the machine is not receiving or sending data.
1)

Turn OFF the power switch on the operation panel.

2)

Open the front cabinet of the main unit. Turn OFF the power
switch in the front cabinet.

3)

Disconnect the power plug of the main unit from the power out-
let.

1)

Attach the mounting plate upper (Package part No. 1) with the
fixing screw A (Package part No. 4) to the installation part of
right side of the main unit. When installing, put the rubber sec-
tion (

) of the mounting plate upper on the lower side.

2)

Remove the fixing screws of the front/rear cover on the lower
part of the main unit. Attach the connecting plate lower front
(Package part No. 2) to the lower front side of the main unit
with the fixing screw B (Package part No. 5).
Attach the connecting plate lower rear (Package part No. 3) to
the lower rear side of the main unit with the fixing screw B
(Package part No. 5).

3)

Remove the fixing screws (2 pcs.) of the machine entry port,
and remove the entry port cover.

4)

Reverse the entry port cover and re-attach it to the machine.
Secure it with the two previously removed screws in procedure
3).

1

Mounting plate upper

2

2

Connecting plate lower front

1

3

Connecting plate lower rear

1

4

Fixing screw A (Hex washer S-tight M4x18)

4

5

Fixing screw B (Hex washer S-tight M4x12)

4

2

1

3

4

5

OFF