MX-M850 (serv.man36). Section 6 Adjustments - Sharp Copying Equipment Service Manual (repair manual)

mx-m850 (serv.man36) service manual
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MX-M850 (serv.man36)
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Service Manual
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Device
Copying Equipment / Section 6 Adjustments
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mx-m850-sm36.pdf
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Read Sharp MX-M850 (serv.man36) Service Manual online

MX-M1100  ADJUSTMENTS  6 – 1
MX-M1100
Service Manual
 
[6] ADJUSTMENTS
1. Outline
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.
There is, however, no need to perform all the adjustments. Perform only the necessary adjustments.
Unnecessary adjustments can be omitted. 
If adjustments are omitted, the sequence of adjustments must be observed in ascending order.  Failure to follow this procedure may result in 
improper adjustment or failure of operation. 
2. Adjustment item list
Job No
Adjustment item list
Simulation
ADJ 1
High voltage values adjustment
ADJ 1A
Main charger grid voltage adjustment
8-2
ADJ 1B
Developing bias voltage adjustment
8-1
ADJ 1C
Transfer current adjustment
8-6
ADJ 1D
Transfer cleaning voltage adjustment
8-17
ADJ 1E
Transfer cleaning brush voltage adjustment
8-18
ADJ 1F
Photoconductor dark potential adjustment
44-3
ADJ 2
Developing unit adjustment
ADJ 2A
Developing doctor gap adjustment
ADJ 2B
Developing roller main pole position adjustment
ADJ 2C
Toner density control reference value setting
25-2 (25-6)
ADJ 3
Print engine image distortion, 
image position, image 
magnification ratio adjustment
ADJ 3A
Print engine image distortion adjustment (LSU parallelism adjustment)
64-2
ADJ 3B
Print engine image magnification ratio adjustment (Main scanning direction)
50-10
ADJ 3C
Printer mode lead edge void area adjustment/Print engine front-rear void area, 
rear edge void area adjustment
50-5
ADJ4
Scan image distortion adjustment 
(OC mode)
ADJ 4A
Scanner (reading) unit parallelism adjustment
ADJ 4B
Scan image sub scanning direction distortion adjustment
ADJ 4C
Scan image main scanning direction distortion adjustment
ADJ5
Scan image distortion adjustment 
(DSPF mode)
ADJ 5A
DSPF level adjustment
ADJ 5B
DSPF skew adjustment (Front surface mode)
64-2
ADJ 5C
DSPF skew adjustment (Back surface mode)
ADJ6
Scan image focus adjustment
ADJ 6A
Image focus adjustment (Document table mode/ DSPF front surface mode)
ADJ 6B
Image focus adjustment (DSPF back surface mode)
ADJ7
Scan image magnification ratio 
adjustment
ADJ 7A
Main scanning direction image magnification ratio adjustment 
(Document table mode)
48-1, 48-5
ADJ 7B
Sub scanning direction image magnification ratio adjustment 
(Document table mode)
48-1, 48-5
ADJ 7C
Main scanning direction image magnification ratio adjustment 
(DSPF front surface mode)
48-1, 48-5
ADJ 7D
Main scanning direction image magnification ratio adjustment 
(DSPF back surface mode)
48-1, 48-5
ADJ 7E
Sub scanning direction image magnification ratio adjustment (DSPF mode)
48-1, 48-5
ADJ8
Off-center adjustment
ADJ 8A
Print engine image off-center adjustment (Software adjustment)
50-10
ADJ 8B
Paper feed off-center adjustment (Manual paper feed unit)(MX-MFX2)
(Mechanical adjustment)
50-10
ADJ 8C
Paper feed off-center adjustment (No.1 - 4 paper feed unit in main unit) 
(Mechanical adjustment)
50-10
ADJ 8D
Paper feed off-center adjustment (LCC) (Mechanical adjustment)
50-10
ADJ 8E
Scan image off-center adjustment (Document table mode)
50-12
ADJ 8F
Scan image off-center adjustment (DSPF (Front surface) mode)
50-12
ADJ 8G
Scan image off-center adjustment (DSPF (Back surface) mode)
50-12
ADJ9
Image position, image loss, and 
void area adjustment
ADJ 9A
Copy mode image loss void area adjustment (Document table mode)
50-1
ADJ 9B
Document scan position adjustment (Scanner scanning position adjustment 
when scanning the front surface in the DSPF mode)
53-8
ADJ 9C
Copy mode image loss adjustment (DSPF mode)
50-6
ADJ 9D
Image send mode, image loss adjustment
50-27
ADJ 9E
FAX send mode image loss adjustment
50-27
ADJ10
CCD calibration
ADJ10A
CCD gamma adjustment (CCD calibration) (Document table mode)
63-3 (63-5)
ADJ10B
CCD gamma adjustment (CCD calibration) (DSPF mode)
63-3
ADJ10C
Color image monochrome conversion adjustment
46-37
ADJ10D
Shading adjustment (Calibration) (DSPF mode)
63-2
ADJ11
Copy image quality adjustment
ADJ11A
Auto copy density, gradation adjustment
46-24
ADJ11B
Manual copy density and gradation adjustment
46-16
ADJ11C
Copy density adjustment by the copy mode (Overall density adjustment) 
(Normally not required)
46-2
ADJ11D
Copy density and gradation adjustment by the copy mode (Normally not required)
46-10
ADJ11E
Copy density and gradation adjustment (DSPF mode) 
(Individual adjustment for the low density area and the high density area)
46-9
ADJ11F
Copy image sharpness adjustment (by each copy mode)
46-31
MX-M1100  ADJUSTMENTS  6 – 2
ADJ12
Printer image quality adjustment
ADJ12A
Automatic printer density and gradation adjustment
67-24
ADJ12B
Manual printer density and gradation adjustment
67-25
ADJ13
Image send, FAX send mode, 
image quality adjustment
ADJ13A
Color image send mode, image density and gradation adjustment 
(by each mode)
46-4
ADJ13B
Monochrome image send mode, image density and gradation adjustment 
(by each mode)
46-5
ADJ13C
Image send mode, image color balance adjustment
46-8
ADJ13D
FAX send mode, image sharpness adjustment
46-39
ADJ14
FAX send mode image quality 
adjustment
ADJ14A
Image density and gradation adjustment in the FAX send mode 
(Collective adjustment of all the FAX modes)
46-40
ADJ14B
Image density and gradation adjustment in the FAX send mode (Normal mode)
46-41
ADJ14C
Image density and gradation adjustment in the FAX send mode (Fine mode)
46-42
ADJ14D
Image density and gradation adjustment in the FAX send mode 
(Super fine mode)
46-43
ADJ14E
Image density and gradation adjustment in the FAX send mode (Ultra fine mode)
46-44
ADJ14F
Image density and gradation adjustment in the IFAX send mode (600dpi mode)
46-45
ADJ15
Setting of the auto exposure mode operating conditions in copy, scan, and FAX
46-19
ADJ16
Paper size detection adjustment 
ADJ16A
Manual paper feed tray paper width sensor adjustment
40-2
ADJ16B
Paper feed tray 4 paper width sensor adjustment
40-12
ADJ16C
DSPF paper feed tray paper width sensor adjustment
53-6
ADJ17
Document size detection adjustment (Document table mode)
41-2
ADJ18
Touch panel coordinate adjustment
65-1
ADJ19
Waste toner full detection adjustment
30-1
ADJ20
Fusing paper guide position adjustment
43-33
ADJ21
Automatic image lead edge 
position, image off-center, image 
magnification ratio adjustment
ADJ21A
Automatic main scanning direction print image magnification ratio adjustment 
(Corresponding to ADJ3B)
50-28
ADJ21B
Automatic print image off-center adjustment (Each paper feed tray, duplex mode) 
(Corresponding to ADJ3C)
Automatic print image lead edge position adjustment (Each paper feed tray, 
duplex mode) (Corresponding to SIM50-1 RRC-B)
50-28
ADJ21C
Automatic sub scanning direction scan image magnification ratio adjustment 
(Document table mode) (Corresponding to ADJ7B)
Automatic scan image off-center adjustment (Document table mode) 
(Corresponding to ADJ8A)
Automatic scan image lead edge reference position adjustment 
(Document table mode) (Corresponding to SIM 50-1 RRC-A)
50-28
ADJ21D
Automatic sub scanning direction scan image magnification ratio adjustment 
(DSPF mode) (Corresponding to ADJ7E)
Automatic scan image off-center adjustment (DSPF mode) (Corresponding to 
ADJ8B/ADJ8C)
Automatic scan image lead edge reference position adjustment (DSPF mode) 
(Corresponding to ADJ9C)
50-28
Job No
Adjustment item list
Simulation
MX-M1100  ADJUSTMENTS  6 – 3
3. Datails of adjustment
 
ADJ 1
High voltage values adjustment
(Note)
To check and adjust the output voltage, use the unit which can
measure an effective value of 1000M
Ω or more internal imped-
ance.  In addition, use a high voltage probe as well. 
(FLUKE87FLUKE80K-40 is recommended.) 
 
1-A
Main charger grid voltage adjustment
This adjustment is needed in the following situations:
* When the high voltage MAIN 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 the output mode to be adjusted with the scroll button.
3)
Enter the adjustment value with 10-key, and press [OK] button.
The adjustment value is set.
Normally when the default value is set, the specified voltage is
outputted.
When [EXECUTE] button is pressed, the adjustment value is saved
and the main charger voltage is outputted.
When the output voltage must be checked or adjusted, follow the
procedure below:
1)
Remove the upper rear cover of the machine
2)
Attach the digital multi-meter between the connector CN2 pin
(3) on the high voltage main PWB and GND.
3)
Enter the adjustment value with 10-key, and press [EXECUTE]
key.
The main charger voltage is outputted for 10sec.
Note:
Perform this procedure timely as extended charge output will
stress the photoconductor.
A㧦580
COPY
B㧦580
PRINTER
C㧦580
FAX
0
A:
SIMULATION NO.08㧙02
MHV/GRID SETTING AND OUTPUT
580
200 㨪1000 㨉
OK
TEST
EXECUTE
CLOSE
Item/Display
Content
Setting 
range
Default
Monitor connector
Actual output voltage
85-sheet 
model
95/110-
sheet model
Connector
Pin No.
85-sheet 
model
95/110-sheet 
model
A
COPY
Main charger grid voltage adjustment value 
(Copy mode)
200-1000
560
580
CN2
3
-590 
± 1 V
-610 
± 1 V
B
PRINTER
Main charger grid voltage adjustment value 
(Priner mode)
200-1000
560
580
CN2
3
-590 
± 1 V
-610 
± 1 V
C
FAX
Main charger grid voltage adjustment value 
(FAX mode)
200-1000
560
580
CN2
3
-590 
± 1 V
-610 
± 1 V
CN2
MX-M1100  ADJUSTMENTS  6 – 4
4)
Check the output voltage with the digital multi-meter.
If the output voltage is outside the specified range described in
the above table, perform procedures 2 thru 4 until the specified
value is reached.
NOTE:
If the specified voltage is not obtained by changing the adjust-
ment value, one of the following parts may be defective.
• High voltage MAIN PWB
• PCU PWB
• OPC drum unit
• High voltage circuit electrode
 
1-B
Developing bias voltage adjustment
This adjustment is needed in the following situations:
* The high voltage MAIN PWB has been 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. .
2)
Select the output mode to be adjusted with the scroll button.
3)
Enter the adjustment value with 10-key, and press [OK] button.
The adjustment value is set.
Normally when the default value is set, the specified voltage is
outputted.
When [EXECUTE] button is pressed, the adjustment value is
saved and the developing bias voltage is outputted simulta-
neously.
When the output voltage must be checked to be normal or not or
when an adjustment is required while checking the output voltage,
follow the procedures below:
1)
Remove the upper rear cover of the machine
2)
Attach the digital multi-meter between the connector CN2 pin
(7) on the high voltage main PWB and GND.
3)
Enter the adjustment value with 10-key, and press [EXECUTE]
key.
The DV BIAS voltage is outputted for 30sec.
4)
Check the output voltage with the digital multi-meter.
If the output voltage is outside the specified range described in
the above table, perform procedures 2 thru 4 until the specified
value is reached. 
NOTE:
If the specified voltage is not obtained by changing the adjust-
ment value, one of the following parts may be defective. 
• High voltage MAIN PWB
• PCU PWB
• Development unit
• High voltage circuit electrode
A㧦495
COPY
B㧦495
PRINTER
C㧦495
FAX
D㧦150
PLUS
0
A:
SIMULATION NO.08㧙01
DV SETTING AND OUTPUT
495
0 㨪 750 㨉
OK
TEST
EXECUTE
CLOSE
Item/Display
Content
Setting range
Default
Monitor connector
Actual output 
voltage
Connector
Pin No.
A
COPY
Developing bias adjustment value (Copy mode)
0-750
495
CN2
7
-500 
± 1 V
B
PRINTER
Developing bias adjustment value (Printer mode)
0-750
495
CN2
7
-500 
± 1 V
C
FAX
Developing bias adjustment value (FAX mode)
0-750
495
CN2
7
-500 
± 1 V
D
PLUS
Reverse developing bias voltage
0-250
150
CN2
7
-150 
± 1 V
CN2
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