MX-5500N, MX-6200N, MX-7000N (serv.man45). Adjustments — Sharp Copying Equipment Service Manual (repair manual)

Model
MX-5500N MX-6200N MX-7000N (serv.man45)
Pages
76
Size
6.43 MB
Type
PDF
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Service Manual
Brand
Device
Copying Equipment / Adjustments
File
mx-5500n-mx-6200n-mx-7000n-sm45.pdf
Date

View Sharp MX-5500N / MX-6200N / MX-7000N (serv.man45) Service Manual online

MX-7000N  ADJUSTMENTS  6 – 1
MX-7000N
Service Manual
 
[6] ADJUSTMENTS
1. General
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.
2. Adjustment item list
Job No.
Adjustment item list
Simulation
ADJ 1
Developing doctor gap adjustment (For color)
ADJ 2
Developing roller main pole position adjustment (For color)
ADJ 3
Developing doctor gap adjustment (For black)
ADJ 4
Developing roller main pole position adjustment (For black)
ADJ 5
Toner density control reference value setting
25-2
ADJ 6
High voltage adjustments
6A
Main charger grid voltage adjustment
8-2
6B
Developing bias voltage adjustment
8-1
6C
Transfer voltage adjustment
8-6
ADJ 7
Image density sensor, image 
registration sensor adjustment
7A
Color image density sensor calibration
44-13
7B
Color image density sensor, black image density sensor, image registration sensor 
adjustment
44-2
ADJ 8
Image skew adjustment (LSU (writing) unit)
61-4
ADJ 9
OPC drum phase adjustment (Auto adjustment)
50-22
ADJ 10
Print engine image magnification ratio adjustment (BK) (Main scanning direction) (Print engine section) (Manual adjustment)
50-10
ADJ 11
Image off-center adjustment (Print engine section)
50-10
ADJ 12
Image registration adjustment 
(Print engine section)
12A
Image registration adjustment (Main scanning direction, sub scanning direction) 
(Auto adjustment)
50-22
12B
Image registration adjustment (Main scanning direction) (Manual adjustment)
50-20
12C
Image registration adjustment (Sub scanning direction) (Manual adjustment)
50-21
ADJ 13
Scan image distortion adjustment
13A
Scanner (reading) unit parallelism adjustment
13B
Scan image (sub scanning direction) distortion adjustment
13C
Scan image (main scanning direction) distortion adjustment
13D
Scan image distortion adjustment (Whole scanner)
ADJ 14
Scan image focus adjustment 
(CCD unit position adjustment)
14A
Scan image focus adjustment (Document table mode, DSPF front surface mode)
48-1
14B
Scan image focus adjustment (DSPF back surface mode)
ADJ 15
DSPF parallelism adjustment
15A
DSPF levelness adjustment
15B
DSPF skew adjustment (Front surface mode)
64-1
15C
DSPF skew adjustment (Back surface mode)
64-1
ADJ 16
Scan image magnification ratio 
adjustment (Document table mode, 
DSPF front surface mode)
16A
Scan image magnification ratio adjustment (Main scanning direction) 
(Document table mode, DSPF front surface mode)
48-1
16B
Scan image magnification ratio adjustment (Sub scanning direction) 
(Document table mode, DSPF front surface mode)
48-1
ADJ 17
Scan image magnification ratio 
adjustment (DSPF back surface mode)
17A
Scan image magnification ratio adjustment (Main scanning direction) 
(DSPF back surface mode)
48-1
17B
Scan image magnification ratio adjustment (Sub scanning direction) 
(DSPF back surface mode)
48-1/48-5
ADJ 18
Scan image off-center adjustment
18A
Scan image off-center adjustment (Document table mode, DSPF front surface mode)
50-12
18B
Scan image off-center adjustment (DSPF back surface mode)
50-12
ADJ 19
Print area (Void area) adjustment (Print engine section)
50-10/50-1
ADJ 20
Copy image position, image loss 
adjustment
20A
Copy image position, image loss adjustment (Document table mode)
50-1 (50-2)
20B
Original scan position adjustment
53-8
20C
Copy image position, image loss adjustment (DSPF mode)
50-6 (50-7)
ADJ 21
Print lead edge image position adjustment (Printer mode) (Print engine section)
50-5
ADJ 22
Copy color balance/density adjustment
22A
63-3 (63-5)
22B
63-3
22C
Copy color balance adjustment (Auto adjustment)
46-24/44-21/
44-26
22D
Copy color balance adjustment (Manual adjustment)
46-21/44-21/
44-26/63-7/
63-8
22E
Copy density adjustment (Each color copy mode) (Whole adjustment) 
(Normally unnecessary to adjust)
46-1
22F
Copy density adjustment (Each monochrome copy mode) (Whole adjustment) 
(Normally unnecessary to adjust)
46-2
22G
Copy color balance adjustment (Color balance adjustment at each density level in 
each color copy mode) (Normally not required)
46-10
22H
Monochrome copy density adjustment (Density adjustment at each density level in 
each monochrome copy mode) (Normally not required)
46-16
MX-7000N  ADJUSTMENTS  6 – 2
3. Details of adjustment
 
ADJ 1
Developing doctor gap 
adjustment (For color)
This adjustment must be executed in the following cases:
* When the developing unit is 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.
* There is abnormally much toner dispersion.
1)
Remove the developing unit from the main unit, and remove
the developing unit upper cover and the developing doctor
cover.
2)
Loosen the developing doctor fixing screw.
3)
Insert a thickness gauge of 0.40mm between 40mm – 70mm
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.)
ADJ 22
Copy color balance/density adjustment
22I
Gamma/density adjustment in the text image edge section (Normally not required)
46-27
22J
Copy color balance adjustment (Single color copy mode) (Normally not required)
46-25
22K
Auto color balance adjustment by the user (Copy color balance auto adjustment 
ENABLE setting and adjustment)
26-53
22L
Background process condition setting in the color auto copy mode
46-33
22M
Color document identification level (ACS operation) setting
46-33
ADJ 23
Printer color balance/density 
adjustment
23A
Printer color balance adjustment (Auto adjustment)
67-24/44-26
23B
Printer color balance adjustment (Manual adjustment)
67-25/44-26/
67-27/67-28
23C
Auto color balance adjustment by the user (Printer color balance auto adjustment 
ENABLE setting and adjustment)
26-54
ADJ 24
Fusing paper guide position adjustment
ADJ 25
Document size sensor adjustment
25A
Document size sensor detection point adjustment
41-1
25B
Document size sensor sensitivity adjustment
41-2
ADJ 26
Manual paper feed tray paper size (width) sensor adjustment
40-2
ADJ 27
DSPF paper feed tray paper size (width) sensor adjustment
53-6
ADJ 28
Touch panel coordinate setting
65-1
ADJ 29
Image loss, void area, image off-
center, image magnification ratio auto 
adjustment with SIM50-28
29A
Print image main scanning direction image magnification ratio automatic adjustment
50-28
29B
Image off-center automatic adjustment
50-28
29C
Copy lead edge image reference position adjustment, image off-center, sub scanning 
direction image magnification ratio automatic adjustment
50-28
29D
DSPF mode auto void adjustment (Service installation adjustment)
50-28
ADJ 30
Shading adjustment
63-2
Job No.
Adjustment item list
Simulation
40mm
70mm
40mm
70mm
MX-7000N  ADJUSTMENTS  6 – 3
5)
Check that the doctor gaps at two positions in 40mm – 70mm
from the both sides of the developing doctor are in the range of
0.40 
± 0.05mm.
* When inserting a thickness gauge, be careful not to scratch the
developing doctor and the developing roller.
 
ADJ 2
Developing roller main pole 
position adjustment (For color)
This adjustment must be executed in the following cases:
* When the developing unit is 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.
* There is abnormally much toner dispersion.
1)
Remove the developing doctor cover, and place the develop-
ing unit on a flat surface.
2)
Attach a thread to a needle or a pin.
3)
Hold the thread and bring the needle near the developing
roller. (Do not use a paper clip because it will not provide a cor-
rect 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 posi-
tion A of the developing unit frame, and check that it is 37.8 
±
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.
 
ADJ 3
Developing doctor gap 
adjustment (For black)
This adjustment must be executed in the following cases:
* When the developing unit is 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.
* There is abnormally much toner dispersion.
1)
Remove the developing unit from the main unit, and remove
the developing unit upper cover and the developing doctor
cover.
2)
Loosen the developing doctor fixing screw.
40mm
70mm
40mm
70mm
23mm
37.8+0.5mm
A
37.8+0.5mm
MX-7000N  ADJUSTMENTS  6 – 4
3)
Insert a thickness gauge of 0.45mm between 40mm – 70mm
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 40mm – 70mm
from the both sides of the developing doctor are in the range of
0.45 
± 0.05mm.
* When inserting a thickness gauge, be careful not to scratch the
developing doctor and the developing roller.
 
ADJ 4
Developing roller main pole 
position adjustment (For black)
This adjustment must be executed in the following cases:
* When the developing unit is 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.
* There is abnormally much toner dispersion.
1)
Remove the developing doctor cover, and place the develop-
ing unit on a flat surface.
2)
Attach a thread to a needle or a pin.
3)
Hold the thread and bring the needle near the developing
roller. (Do not use a paper clip because it will not provide a cor-
rect 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 posi-
tion A of the developing unit frame, and check that it is 62.1 
±
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.
40mm
70mm
70mm
40mm
40mm
70mm
70mm
40mm
2
㨪3mm
62.1 0.5mm
+
62.1 0.5mm
+
A
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