DOWNLOAD Sharp MX-M363N / MX-M363U / MX-M503N / MX-M503U (serv.man17) Service Manual ↓ Size: 69.25 MB | Pages: 127 in PDF or view online for FREE

MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 1

MX-M503N

Service Manual

 

Each adjustment item in the adjustment item list is associated with
a specific Job number. Perform the adjustment procedures in the
sequence of Job numbers from the smallest to the greatest.
However, there is no need to perform all the adjustment items. Per-
form only the necessary adjustments according to the need.

Unnecessary adjustments can be omitted. Even in this case, how-
ever, the sequence from the smallest to the greatest Job number
must be observed.
If the above precaution should be neglected, the adjustment would
not complete normally or trouble may occur.

ADJ 1

Adjust the developing unit

1A

Adjust the developing doctor gap

1B

Adjust the developing roller main pole position

1C

Toner density control reference value setting

25-2

ADJ 2

Adjusting high voltage values

2A

Adjust the main charger grid voltage

8-2

2B

Adjust the developing bias voltage

8-1

2C

Transfer current and voltage adjustment

8-6

2D

Transfer separation bias voltage adjustment

8-17

ADJ 3

Print engine image skew, image 
position, image magnification ratio, 
void area adjustments 
(Manual adjustments)

3A

Print engine image skew adjustment (LSU parallelism adjustment)

64-2

3B

Print engine image magnification ratio adjustment (Main scanning direction)

50-10

3C

Print engine print area (void area) adjustment

50-10/50-1

3D

Print engine image off-center adjustment

50-10

ADJ 4

Scan image distortion adjustment 
(OC mode)

4A

Scanner (reading) unit parallelism adjustment

4B

Scan image sub scanning direction distortion adjustment

4C

Scan image main scanning direction distortion adjustment

4D

Scan image distortion adjustment (Whole scanner unit)

ADJ 5

Scanner image skew adjustment 
(DSPF/RSPF mode)

5A

DSPF/RSPF parallelism adjustment

5B

DSPF/RSPF skew adjustment (Front surface mode)

64-2

5C

DSPF skew adjustment (Back surface mode)

64-2

ADJ 6

Scan image focus adjustment

6A

Image focus adjustment (Document table mode/DSPF/RSPF front surface mode)

48-1

6B

Image focus adjustment (DSPF back surface mode)

ADJ 7

Scan image magnification ratio 
adjustment (Manual adjustment)

7A

Main scanning direction image magnification ratio adjustment (Document table mode)

48-1

7B

Sub scanning direction image magnification ratio adjustment (Document table mode)

48-1/48-5

7C

Main scanning direction image magnification ratio adjustment (DSPF/RSPF mode)

48-1

7D

Sub scanning direction image magnification ratio adjustment (DSPF/RSPF mode)

48-1

ADJ 8

Scan image off-center adjustment 
(Manual adjustment)

8A

Scan image off-center adjustment (Document table mode)

50-12

8B

Scan image off-center adjustment (DSPF/RSPF mode)

50-12/50-6

ADJ 9

Print lead edge image position, void area adjustment (Printer mode)

50-5

ADJ 10

Copy image position, image loss, 
and void area adjustment 
(Manual adjustment)

10A

Copy image position, image loss, void area adjustment (Document table mode)

50-1

10B

Document scan position adjustment 
(DSPF/RSPF mode scanner scan position adjustment)

53-8

10C

Copy mode image loss adjustment (DSPF/RSPF mode)

50-6

ADJ 11

CCD calibration

11A

CCD gamma adjustment (CCD calibration) (Document table mode)

63-3/63-5

11B

CIS gamma adjustment (CIS calibration) (DSPF mode) (DSPF-installed machine only)

63-3

11C

Shading adjustment (Calibration) (DSPF mode) (DSPF-installed machine only)

63-2

ADJ 12

Copy quality adjustment 
(Auto printer density and gradation 
adjustment)

12A

Auto copy density and gradation adjustment, and auto printer density and gradation 
adjustment

46-24

12B

Manual copy density and gradation adjustment

46-16

12C

Copy density in each copy mode (Overall density adjustment) 
(Normally unnecessary to adjust)

46-2

12D

Density and gradation adjustment in each copy mode (Normally not required)

46-10

12E

Document background density reproducibility adjustment in the auto copy mode 
(Normally unnecessary to adjust)

46-32

12F

Color document reproducibility adjustment in the copy mode 
(Normally unnecessary to adjust) (N model only)

46-37

12G

Copy density and gradation adjustment (DSPF mode) (Individual adjustment of the low 
density area and the high density area) (In the case of DSPF)

46-9

12H

Copy density and gradation adjustment (RSPF mode) (Individual adjustment of the low 
density area and the high density area) (In the case of RSPF)

46-9

12I

Automatic copy and printer density and gradation adjustment by the user 
(Setting of ENABLE/DISABLE of the automatic copy density and gradation adjustment, and 
the adjustment)

ADJ 13

Printer quality adjustment (Printer 
density and gradation adjustment)

13A

Manual printer density and gradation adjustment

67-25

ADJ 14

Automatic setting of exposure mode operating conditions in copy, scan, and FAX

46-19

ADJ 15

Paper size detection adjustment

15A

Manual paper feed tray paper width sensor adjustment

40-2

15B

DSPF/RSPF paper feed tray paper width sensor adjustment

53-6

ADJ 16

Document size detection 
adjustment (Document table mode)

16A

Document size sensor detection point adjustment

41-1

16B

Adjust the sensitivity of the original size sensor

41-2

MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 2

 

 

This adjustment is needed in the following situations:
* The developing unit has been disassembled.
* When the print image density is low.
* When there is a blur on the print image.
* When there is unevenness in the print image density.
* The toner is excessively dispersed.

NOTE: Be careful not to put fingerprints, oil, grease, or foreign

materials on the roller during the work.

NOTE: Do not hold the adjacent section of the MG roller strongly.
1)

Remove the developing unit from the main unit, and remove
the developing unit upper cover.

NOTE: All DV material must be removed before beginning step 2.
2)

Loosen the developing doctor fixing screw.

3)

Insert a thickness gauge of 0.40mm in between 20mm - 40mm
from the edge of the developing doctor.

4)

Push the developing doctor in the arrow direction, and tighten
the fixing screw of the developing doctor. (Perform the similar
procedure for the front frame and the rear frame.)

5)

Check that the doctor gaps at two positions in 20mm - 40mm
from the both sides of the developing doctor are in the range of
0.40 

 0.02mm.

* When inserting a thickness gauge, be careful not to scratch the

developing doctor and the developing roller.

Note for use of a thickness gauge
• Do not insert the gauge diagonally.
• The gauge must pass freely.
• The advisable point of measurement is the MIN point of the MG

roller oscillation.

 

This adjustment is needed in the following situations:
* The developing unit has been disassembled.
* When the print image density is low.
* When there is a blur on the print image.
* When there is unevenness in the print image density.
* The toner is excessively dispersed.

NOTE: Be careful not to put fingerprints, oil, grease, or foreign

materials on the roller during the work.

1)

Remove the developing doctor cover, and place the develop-
ing unit on a flat surface.

NOTE: All DV material must be removed before begining step 2.
2)

Attach a piece of string to a sewing needle or pin.

ADJ 17

Touch panel coordinate setting

65-1

ADJ 18

Image lead edge position, image 
off-center, image magnification 
ratio adjustment 
(Automatic adjustment)

18A

Print image main scanning direction image magnification ratio automatic adjustment 
(Document table mode)

50-28

18B

Image off-center automatic adjustment (Each paper feed tray)

50-28

18C

Copy lead edge image reference position adjustment, image off-center, sub scanning 
direction image magnification ratio automatic adjustment (Document table mode)

50-28

18D

Copy image off-center, image lead edge position, sub scanning direction image 
magnification ratio automatic adjustment (DSPF/RSPF mode)

50-28

ADJ 19

Fusing paper guide position adjustment

20mm

40mm

20mm

40mm

MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 3

3)

Hold the thread and bring the needle near the developing
roller. (Do not use a paper clip because too heavy. It will not
provide a correct position.)

4)

Mark the developing roller surface on the extension line of the
needle with the needle at 2 - 3mm from the developing roller
surface. (Never touch the needle tip with the developing roller.)

5)

Measure the distance between the marking position and the
doctor tip of the developing unit, and check that it is 12.0 



0.5mm.
If the distance is not within the above range, adjust the devel-
oping roller main pole position in the following procedures.

6)

Remove the developing unit front cover, loosen the fixing
screw of the developing roller main pole adjustment plate, and
move the adjustment plate in the arrow direction to adjust.

Repeat procedures 3) - 6) until the developing roller main pole
position comes to the specified range.

7)

After completion of the adjustment of the developing roller
main pole position, fix the developing roller main pole adjust-
ment plate with the fixing screw.

 

This adjustment is needed in the following situations:
* When developer is replaced.

NOTE: Be sure to execute this adjustment only when developer is

replaced. Never execute it in the other cases.

1)

With the front cabinet open, enter SIM 25-2.
When setting the toner density control reference value, pull out
the toner cartridge in advance.

2)

Close the front cabinet and press [EXECUTE] button.

2

㨪 3mm

12.0±0.5mm

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

$8720$7,&'(9(/23(5$'-8670(17

(;(&87(

$7'(9($'-B.

$7'(9(92B.

.

Adjustment completed

Abnormal end

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

$8720$7,&'(9(/23(5$'-8670(17

(;(&87(

7&'B.

7&9B.

.

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

$8720$7,&'(9(/23(5$'-8670(17

(;(&87(

$7'(9($'-B.

$7'(9(92B.

.

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

$8720$7,&'(9(/23(5$'-8670(17

(;(&87(

7&'B.(((/

7&9B.(((/

.

MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 4

3)

After completion of the adjustment of the toner density control
reference value, insert the toner cartridge.

4)

Close the front cabinet.

5)

When [EXECUTE] key is pressed, it is highlighted. The devel-
oping roller rotates, and the toner density sensor detects toner
density, and the output value is displayed.
The above operation is executed for 3 minutes, and the aver-
age value of the toner density sensor detection level is set
(saved) as the reference toner density control value.
When the reference toner density control adjustment operation
is completed, [EXECUTE] key returns to normal from highlight.
This makes known about whether the adjustment operation is
completed or not.
NOTE:
If the operation is interrupted within 3 minutes, the adjustment
result is not reflected.
When [EXECUTE] key is pressed during rotation, the opera-
tion is stopped and [EXECUTE] key returns to the normal dis-
play.
If [EE-EU], [EE-EL] or [EE-EC] is displayed, setting of the ref-
erence toner density control value is not completed normally.

NOTE: When not replacing the developer, do not execute SIM25-

2.

 

 

This adjustment is needed in the following situations:
* When the high voltage PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)

Remove the rear cover of the machine.

2)

Enter the SIM 8-2 mode.

3)

Apply a digital multi-meter between the check pin 1 of the high
voltage PWB and the GND.

4)

Press [EXECUTE] key.
The main charger grid voltage is outputted for 30sec.
If this procedure is executed for a long time, the OPC drum
and the developing roller may be adversely affected. Use this
procedure as short as possible.
If possible, use a old developer unit and OPC drum for this
adjustment.

5)

Check the monitor voltage with the digital multi-meter.
If the monitor voltage is not in the range of the specified val-
ues, change the adjustment value and adjust.

If the specified value voltage is not obtained even though the
adjustment value is changed, the following parts may be
defective.
• High voltage PWB
• PCU PWB
• MC  unit
• OPC drum unit
• High voltage circuit electrode

EE-EL

EL abnormality

Sensor output level less than 67, or 
sensor control voltage level over 197

EE-EU

EU abnormality

Sensor output level over 154, or sensor 
control voltage level less than 49

EE-EC

EC abnormality

Sensor output level less than 95, or 
sensor control voltage level over 105

A

GB_K

K charging/grid 
bias set value

31.22 

 0.26V

0 - 850

650

EXECUTE

EXECUTE

or after 30 sec.

10-key

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

0+9*5,'6(77,1*$1'287387

$˖

˷̚˹

˖*%B.

$˖

2.

(;(&87(

/2:

0,''/(

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

0+9*5,'6(77,1*$1'287387

$˖

˷̚˹

˖*%B.

$˖

2.

(;(&87(

/2:

0,''/(