DOWNLOAD Sharp MX-B381 / MX-B401 (serv.man7) Service Manual ↓ Size: 46.25 MB | Pages: 127 in PDF or view online for FREE

MX-B381/B401  EXTERNAL VIEW AND INTERNAL STRUCTURE  3 – 14

1

Transport roller 3 (Idle) (RSPF)

Applies a pressure to the document and the transport roller to give a transport power of the transport roller 
to the document.

2

Transport roller 3 (Drive) (RSPF)

Transports the document from the transport roller 2 to the paper exit roller.
Transports the document switched back by the paper exit roller to the transport roller 2 in the duplex 
scanning mode.

3

Transport roller 4 (Idle) (RSPF)

Applies a pressure to the document and the transport roller to give a transport power of the transport roller 
to the document.

4

Transport roller 2 (Idle) (RSPF)

Applies a pressure to the document and the transport roller to give a transport power of the transport roller 
to the document.

5

Transport roller 2 (Drive) (RSPF)

Transports the document from the transport roller 1 to the transport roller 3.

6

Transport roller 1 (Drive) (RSPF)

Transports the document fed from the document tray to the transport roller 2.

7

Transport roller 1 (Idle) (RSPF)

Applies a pressure to the document and the transport roller to give a transport power of the transport roller 
to the document.

8

Paper feed roller (RSPF)

Feeds the document to the transport section.

9

Paper pickup roller (RSPF)

Transports the document to the separation roller.

10

Paper exit roller (Idle) (RSPF)

Applies a pressure to the document and the transport roller to give a transport power of the transport roller 
to the document.

11

Paper exit roller (Drive) (RSPF)

Discharges the document. Transports the document to the transport roller 2 in the duplex scanning mode.

12

Paper exit roller (Drive)

Discharges the paper. / Transports the paper to the switchback section.

13

Paper exit roller (Idle)

Applies a pressure to the paper and the paper exit roller to give a transport power of the paper exit roller to 
the paper.

14

Transport roller 4 (Idle)

Applies a pressure to the paper and the transport roller to give a transport power of the transport roller to 
the paper.

15

Transport roller 4 (Drive)

Transports the paper switched back by the paper exit roller to the transport roller 5.

16

Transport roller 3 (Drive)

Transports the paper from the fusing roller to the paper exit roller.

17

Transport roller 3 (Idle)

Applies a pressure to the paper and the transport roller to give a transport power of the transport roller to 
the paper.

18

Fusing roller (Heating)

Heats and presses toner on the paper to fuse on the paper.

19

Fusing roller (Pressing)

Applies a pressure to the fusing roller (heating).

20

Transport roller 5 (Drive)

Transports the paper from the transport roller 4 to the transport roller 2.

19

17

14

21
22

25

24

26

30

29

31

18

16

15

13

12

8

7

5

4

6

10 11

9

20

23

27
28

1

2

3

MX-B381/B401  EXTERNAL VIEW AND INTERNAL STRUCTURE  3 – 15

21

Transport roller 5 (Idle)

Applies a pressure to the paper and the transport roller to give a transport power of the transport roller to 
the paper.

22

Resist roller (Idle)

Applies a pressure to the paper and the resist roller, giving a transport power of the resist roller to the 
paper.

23

Resist roller (Drive)

Transports paper to the transfer section. / Controls the paper transport timing, and adjusts the relative 
relations between images and paper.

24

Transport roller 2 (Idle)

Applies a pressure to the paper and the transport roller to give a transport power of the transport roller to 
the paper.

25

Paper feed roller (Manual paper feed tray)

Transports paper to the transport roller 2.

26

Transport roller 2 (Drive)

Transports the paper transported from the transport roller 1 to the resist roller.

27

Transport roller 1 (Drive)

Transports paper which was fed from the paper feed tray 1 to the transport roller 2.

28

Transport roller 1 (Idle)

Applies a pressure to the paper and the transport roller to give a transport power of the transport roller to 
the paper.

29

Paper feed roller (No. 1 paper feed tray)

Transport paper to the paper transport section.

30

Separation roller (No. 1 paper feed tray)

Separates paper to prevent against double feed.

31

Paper pickup roller (No. 1 paper feed tray)

Transports paper to the paper feed roller.

MX-B381/B401  ADJUSTMENTS  4 – 1

MX-B401

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

Adjusting high voltage values

1A

Adjust the main charger grid voltage

8-2

1B

Adjust the developing bias voltage

8-1

1C

Transfer voltage adjustment

8-6

ADJ 2

Image density sensor adjustment

44-2

ADJ 3

Image skew adjustment (LSU unit)

64-2

ADJ 4

Print engine image magnification ratio adjustment (Main scanning direction) (Print engine section) (Manual adjustment)

50-10

ADJ 5

Image off-center adjustment (Print engine section)

50-10

ADJ 6

Scan image magnification ratio 
adjustment (Document table 
mode)

6A

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

48-1

6B

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

48-1

ADJ 7

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

7A

Scan image magnification ratio adjustment (Main scanning direction) (RSPF mode)

48-1

7B

Scan image magnification ratio adjustment (Sub scanning direction) (RSPF mode)

48-1

ADJ 8

Scan image off-center 
adjustment

8A

Scan image off-center adjustment (Document table mode)

50-12

8B

Scan image off-center adjustment (RSPF mode)

50-12

ADJ 9

Print area (Void area) adjustment (Print engine section)

50-10/50-1

ADJ 10

Copy image position, image loss 
adjustment

10A

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

50-1 (50-2)

10B

Adjust the original scan start position (Adjust the scanner read position in RSPF mode front 
face scan)

53-8

10C

Copy image position, image loss adjustment (RSPF mode)

50-6 (50-7)

ADJ 11

Print lead edge image position adjustment (Printer mode) (Print engine section)

50-5

ADJ 12

Copy density and gradation 
adjustment

12A

CCD gamma adjustment (CCD calibration)

63-3 (63-5)

12B

Copy density and gradation adjustment (Auto adjustment)

46-24

12C

Copy density and gradation adjustment (Manual adjustment)

46-21

12D

Copy density and gradation adjustment (Each copy mode) (Whole adjustment) 
(Normally unnecessary to adjust)

46-2

12E

Condition setting of document density reading operation (exposure) in the auto copy mode 
(Normally not required)

46-19

12F

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

46-32

12G

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

46-37

12H

Sharpness adjustment in the auto copy mode (Normally unnecessary to adjust)

46-60

12I

Copy high density part density correction setting (Prevents against tone gap) 
(Normally unnecessary to adjust)

46-23

12J

Copy density and gradation adjustment in the RSPF mode (Normally unnecessary to adjust)

46-9

12K

Auto copy density and gradation adjustment by the user 
(Copy auto adjustment enable setting and adjustment)

46-53

ADJ 13

Printer density and gradation 
adjustment

13A

Printer density and gradation adjustment (Auto adjustment)

67-24

13B

Printer density and gradation adjustment (Manual adjustment)

67-25

13C

Printer density and gradation adjustment (low density part density and gradation adjustment) 
(Normally unnecessary to adjust)

67-36

13D

Printer high density part density correction setting 
(High density part tone gap countermeasure) (Normally unnecessary to the setting change)

67-34

13E

Auto density and gradation adjustment by the user (Printer auto adjustment ENABLE setting 
and adjustment)

26-54

13F

Copy/Printer density and gradation adjustment (Automatic adjustment)

46-74

ADJ 14

Manual paper feed tray paper size (width) sensor adjustment

40-2

ADJ 15

Touch panel coordinate setting

65-1

ADJ 16

Image loss, void area, image off-
center, image magnification ratio 
auto adjustment with SIM50-28

16A

Print image main scanning direction image magnification ratio automatic adjustment

50-28

16B

Image off-center automatic adjustment (Document table mode)

50-28

16C

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

50-28

16D

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

50-28

ADJ 17

Fusing paper guide position adjustment

MX-B381/B401  ADJUSTMENTS  4 – 2

 

 

This adjustment is needed in the following situations:
* When the MC 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 output mode and an item to be adjusted.

3)

Enter the adjustment value (specified value) in the middle
speed mode, and press [OK] key.
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
Enter the adjustment value of each mode which is specified on
the label attached on the MC high voltage power PWB.

NOTE: Note that the adjustment value may differ depending on the

MC high voltage power PWB.
Since the adjustment value label is attached on the MC
high voltage PWB, the PWB must be removed in order to
check the adjustment value.
This is a troublesome procedure. Therefore, it is advisable
to put down the adjustment value in advance.

GBK:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.

NOTE: Since the high voltage output cannot be checked with a

digital multi meter in this model, a judgment of the output
must be made by checking the print image quality.

 

This adjustment is needed in the following situations:
* When the MC 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)

Go through the modes specified in Simulation 8-1.

2)

Select an output mode and an item to be adjusted.

3)

Enter the adjustment value (specified value) in the middle
speed mode, and press [OK] key.
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
Enter the adjustment value of each mode which is specified on
the label attached on the MC high voltage power PWB.

NOTE: Note that the adjustment value may differ depending on the

MC high voltage power PWB.
Since the adjustment value label is attached on the MC
high voltage PWB, the PWB must be removed in order to
check the adjustment value.
This is a troublesome procedure. Therefore, it is advisable
to put down the adjustment value in advance.

DVK:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.

NOTE: Since the high voltage output cannot be checked with a

digital multi meter in this model, a judgment of the output
must be made by checking the print image quality.

MIDDLE

A

MIDDLE 
SPEED GB_K

K charging/grid bias set 
value at middle speed

150 - 850

LOW

A

LOW SPEED 
GB_K

K charging/grid bias set 
value at low speed

150 - 850

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MIDDLE

A

MIDDLE SPEED 
DVB_K

K developing bias set 
value at middle speed

0-600

LOW

A

LOW SPEED 
DVB_K

K developing bias set 
value at low speed

0-600

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