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MX-M356NV  ADJUSTMENTS AND SETTINGS  5 – 1

MX-M356NV

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

Developing doctor gap adjustment

1B

MG roller main pole position adjustment

1C

Toner density control reference value setting

25-2

ADJ 2

High voltage values check

2A

Check the main charger grid voltage

8-2

2B

Check the developing bias voltage

8-1

2C

Transfer current adjustment

8-6

ADJ 3

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

3A

Print image off-center automatic adjustment (Print engine) (Each paper feed tray)

50-28

3B

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

50-28

3C

Copy mode image lead edge position, image loss, void area, image off-center, sub scanning 
direction image magnification ratio automatic adjustment (Scanner) (RSPF mode)

50-28

ADJ 4

Scan image distortion 
adjustment (Document table 
mode)

4A

Scanner (reading) unit parallelism adjustment

4B

Scan image (sub scanning direction) distortion adjustment

4C

Scan image (main scanning direction) distortion adjustment

ADJ 5

Scanner image skew adjustment (RSPF mode)

64-2

ADJ 6

Scan image focus adjustment

48-1

ADJ 7

Print lead edge image position adjustment (Printer mode)

50-5

ADJ 8

Image density adjustment

8A

Scanner calibration (CCD calibration)

63-3 (63-5)

8B

Copy / Image send / 
FAX image quality 
adjustment (Individual 
adjustment)

8B 
(1)

Monochrome copy density adjustment (for each monochrome copy 
mode) (separately for the low-density area and the high-density area) 
(No need to adjust normally)

46-2

8B 
(2)

Automatic monochrome (Copy/Scan/FAX) mode document density 
scanning operation (exposure operation) conditions setting (Normally 
no need to set)

46-19

8B 
(3)

Document low density image density reproduction adjustment in the 
automatic monochrome (Copy/Scan/FAX) mode (No need to adjust 
normally) (Background density adjustment in the scanning section)

46-32

8B 
(4)

Copy/Scan low density image density adjustment (for each mode) 
(No need to adjust normally) (Effective only for the color scan 
function)

46-63

8B 
(5)

Monochrome (Copy/Scan/FAX) mode color document reproduction 
adjustment (No need to adjust normally)

46-37

8B 
(6)

RSPF mode (Copy/Scan/FAX) density adjustment (No need to adjust 
normally)

46-9

ADJ 9

Paper size sensor adjustment

9A

Manual paper feed tray paper size (width) sensor adjustment

40-2

9B

RSPF paper feed tray document size (width) sensor adjustment

53-6

ADJ 10

Document size detection 
adjustment

10A

Document size sensor detection point adjustment

41-1

10B

Adjust the sensitivity of the original size sensor

41-2

ADJ 11

Touch panel coordinate setting

65-1

ADJ 12

Print image position, void area, 
off-center adjustment (Print 
engine) (Manual adjustment)

12A

Print image print area adjustment (Print engine) (Manual adjustment)

50-10/50-1

12B

Print image off-center adjustment (Print engine) (Manual adjustment)

50-10

ADJ 13

Scan image magnification ratio 
adjustment (Manual adjustment)

13A

Scan image magnification ratio adjustment (main scanning direction) (Manual adjustment) 
(Document table mode)

48-1

13B

Scan image magnification ratio adjustment (sub scanning direction) (Manual adjustment) (Document 
table mode)

48-1/48-5

13C

Scan image magnification ratio adjustment (main scanning direction) (Manual adjustment) (RSPF 
mode)

48-1

13D

Scan image magnification ratio adjustment (sub scanning direction) (Manual adjustment) (RSPF 
mode)

48-1

ADJ 14

Scan image off-center 
adjustment (Manual adjustment)

14A

Scan image off-center adjustment (Manual adjustment) (Document table mode)

50-12

14B

Scan image off-center adjustment (Manual adjustment) (RSPF mode)

50-12/50-6

ADJ 15

Copy image position and image 
loss adjustment (Manual 
adjustment)

15A

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

50-1

15B

Image scanning position adjustment (Manual adjustment) (RSPF mode)

53-8

15C

Copy image position, image loss, void area adjustment (Manual adjustment) (RSPF mode)

50-6

ADJ 16

Finisher adjustments (alignment, staple position)

3-10

MX-M356NV  ADJUSTMENTS AND SETTINGS  5 – 2

 

 

1) Remove the doctor cover.

2) Loosen the developing doctor fixing screw A.
3) Insert  a  thickness  gauge  of  1.5mm  to  the  positions  of  three

screws on the developing doctor as shown.

4) Tighten the developing doctor fixing screw.
5) Check the clearance of the developing doctor. If it is within the

specified  range,  then  fix  the  doctor  fixing  screw  with  screw
lock.

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

developing doctor and the MG roller.

 

1) Put the developing unit on a flat surface.
2) Tie a needle or pin on a string.
3) Hold the string and bring the needle close to the MG roller hor-

izontally. (Do not use paper clip, which is too heavy to make a
correct  adjustment.)  (Put  the  developing  unit  horizontally  for
this adjustment.)

4) Do  not  bring  the  needle  into  contact  with  the  MG  roller,  but

bring it to a position 2 or 3mm apart from the MG roller. Mark
the point on the MG roller which is on the extension line from
the needle tip.

5) Measure the distance from the marking position to the top of

the  doctor  plate  of  the  developing  unit  to  insure  that  it  is
9.1mm.
If the distance is not within the specified range, loosen the fix-
ing screw A of the main pole adjustment plate, and move the
adjustment plate in the arrow direction to adjust.

 

This adjustment must be performed in the following cases:
* When developer is replaced.

CAUTION: Be sure to execute this adjustment only when developer

is replaced. Never execute it in the other cases.

1)

Toner cartridge installation
Shake the toner cartridge 4 - 5 times horizontally.
Toner  cartridges  must  be  installed  to  execute  this  setting
(Toner density control reference value setting)
Because  of  the  structure  of  this  machine,  if  SIM25-2  is  exe-
cuted  without  the  toner  cartridges  installed,  the  waste  toner
transport pipe of the process UN may be locked.

CAUTION: This  is  performed  only  when  a  new  toner  cartridge  is

installed.

2)

Press the lock release lever and insert it along the guide in the
machine until it locks securely.

CAUTION: Before installation, clean and remove dust and dirt from

the toner cartridge.

3)

With the front cabinet open, enter SIM25-2.

A

A

A

F

C

R

F/C/R: 1.5

Developing doctor gap

+0.1mm
-0.15mm

9.1mm

A

㹼5

MX-M356NV  ADJUSTMENTS AND SETTINGS  5 – 3

4)

Close the front cabinet.

5)

When  [EXECUTE]  key  is  pressed,  [EXECUTE]  key  is  high-
lighted (in black) and the developer adjustment is started. (The
adjustment is automatically performed for 3 minutes.)

6)

When the developer adjustment is completed, [EXECUTE] key
returns to the normal state (in white), and the developer adjust-
ment value is displayed.

CAUTION: If  the  operation  is  interrupted  within  3  minutes,  the

adjustment result is not reflected.
When [EXECUTE] key is pressed during the operation,
the operation is stopped and [EXECUTE] key returns to
the normal display.
If [EE-EU] or [EE-EL] is displayed, setting of the refer-
ence  toner  density  control  value  is  not  completed  nor-
mally.
Troubleshoot  the  cause,  remove  the  cause,  and  per-
form setting again.

7)

Cancel SIM25-2 with [CA] key.

CAUTION: When  not  replacing  the  developer,  do  not  execute

SIM25-2.

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Adjustment completed

EE-EL

EL abnormality

Sensor output level than 78

EE-EU

EU abnormality

Sensor output level over 178

MX-M356NV  ADJUSTMENTS AND SETTINGS  5 – 4

 

 

Check the main charger grid voltage　
setting

This check must be performed in the following cases:
* When the MC/DV high voltage power PWB 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 8-2 mode.

2) Select an item to be checked.

3)

Enter  the  main  charger  values  of  items  A/B  under  TS_OFF/
ON.
When [OK] key is pressed, the set value is saved.
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3) is outputted for 30sec.
When [EXECUTE] key is pressed again, the output is stopped.
Stop it in a short time to affect the drum surface. (less than five
seconds)

 

This check must be performed in the following cases:
* When the MC/DV high voltage power PWB 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 8-1 mode.

TS_
OFF

A

COPY GB

Charging/grid 
bias set value in 
a copy job 
(Toner save 
mode OFF)

0 - 750

575

575

605

B

PRINTER 
FAX
GB

Charging/grid 
bias set value in 
a Print/FAX job 
(Toner save 
mode OFF)

0 - 750

575

575

605

TS_
ON

A

COPY GB

Charging/grid 
bias set value in 
a copy job 
(Toner save 
mode ON)

0 - 750

495

495

495

B

PRINTER 
GB

Charging/grid 
bias set value in 
a print job 
(Toner save 
mode ON)

0 - 750

425

425

425

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