MX-6500N, MX-7500N (serv.man19). Section 5 Adjustments and Settings — Sharp Copying Equipment Service Manual (repair manual)

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MX-6500N MX-7500N (serv.man19)
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98
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Service Manual
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Device
Copying Equipment / Section 5 Adjustments and Settings
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mx-6500n-mx-7500n-sm19.pdf
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View Sharp MX-6500N / MX-7500N (serv.man19) Service Manual online

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 1
MX-7500N
Service Manual
 
[5] ADJUSTMENTS AND SETTINGS
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
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
High voltage adjustment
2A
Adjust the main charger grid voltage
8-2
2B
Adjust the developing bias voltage
8-1
2C
Transfer current/voltage adjustment
8-6
ADJ 3
Print/scan image 
automatic magnification 
ratio adjustment, Print/
scan image automatic 
position adjustment 
(Automatic adjustment)
3A
Print image automatic magnification ratio adjustment (Main scanning direction) (Print engine)
50-28
3B
Print image automatic position adjustment (Main scanning direction, sub scanning direction) (Print 
engine) (Each paper feed tray)
50-28
3C
Scan image automatic magnification ratio adjustment (Sub scanning direction) (Scanner), Scan 
image automatic position adjustment (Main scanning direction, sub scanning direction) (Scanner)
50-28
3D
Scan image automatic magnification ratio adjustment (Sub scanning direction) (DSPF), Scan 
image automatic position adjustment (Main scanning direction, sub scanning direction) (DSPF)
50-28
ADJ 4
Print engine image 
distortion adjustment / 
OPC drum phase 
adjustment / Color 
registration adjustment 
(Print engine section)
4A
Print engine image distortion adjustment (Manual adjustment) / OPC drum phase adjustment 
(Automatic adjustment) / Color registration adjustment (Automatic adjustment)
50-22
4B
Print engine image skew (LSU skew) adjustment (Manual adjustment) 
(No need to adjust normally)
50-20
4C
Color registration offset adjustment (No need to adjust normally)
50-20
ADJ 5
Scan image distortion 
adjustment (Document 
table mode)
5A
Scanner (reading) unit parallelism adjustment
5B
Scan image (sub scanning direction) distortion adjustment
5C
Scan image (main scanning direction) distortion adjustment
5D
Scan image distortion adjustment (Whole scanner unit)
ADJ 6
Scanner image skew 
adjustment (DSPF mode)
6A
DSPF parallelism adjustment
6B
DSPF skew adjustment (Front surface mode)
64-2
6C
DSPF skew adjustment (Back surface mode)
64-2
ADJ 7
Scan image focus 
adjustment
7A
Image focus adjustment (Document table mode/DSPF front surface mode)
48-1
7B
Image focus adjustment (DSPF back surface mode)
ADJ 8
Print lead edge image position adjustment (Printer mode)
50-5
ADJ 9/
SET1
Color balance/density 
adjustment
Note before execution of the image quality adjustment
Copy image quality check
Printer image quality check
9A
Scanner calibration (CCD calibration)
63-3 (63-5)
SET
1
Color balance 
adjustment target 
setup
1A
Copy color balance adjustment target setup
63-7/8/11
1B
Printer color balance adjustment target setup
67-26/27/28
9B
Copy/Printer color balance and density adjustment (Automatic adjustment) (Basic adjustment)
46-74
9C
Copy quality 
adjustment (Basic 
adjustment)
9C 
(1)
Copy color balance and density adjustment (Automatic adjustment)
46-24
9C 
(2)
Copy color balance and density adjustment (Manual adjustment)
46-21
9D
Copy / Image 
send / FAX image 
quality adjustment 
(Individual 
adjustment)
9D 
(1)
Color copy density adjustment (for each color copy mode) (separately 
for the low-density area and the high-density area) (No need to adjust 
normally)
46-1
9D 
(2)
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
9D 
(3)
Color copy color balance, gamma adjustment (for each color copy 
mode) (No need to adjust normally)
46-10
9D 
(4)
Monochrome copy density, gamma adjustment (for each monochrome 
copy mode) (No need to adjust normally)
46-16
9D 
(5)
46-19
9D 
(6)
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
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 2
ADJ 9/
SET1
Color balance/density 
adjustment
9D
Copy / Image 
send / FAX image 
quality adjustment 
(Individual 
adjustment)
9D 
(7)
Copy/Scan low density image density adjustment (for each mode) 
(No need to adjust normally)
46-63
9D 
(8)
Color copy, text, line image reproduction adjustment (edge gamma, 
density adjustment) (Text, Map mode) (No need to adjust normally)
46-27
9D 
(9)
Monochrome (Copy/Scan/FAX) mode color document reproduction 
adjustment (No need to adjust normally)
46-37
9D 
(10)
Color copy mode dark area gradation (black component quantity) 
adjustment (No need to adjust normally)
46-38
9D 
(11)
Color (Copy/Scan) mode sharpness adjustment 
(No need to adjust normally)
46-60
9D 
(12)
Copy high density image density reproduction setting 
(Normally unnecessary to the setting change)
46-23
9D 
(13)
Copy color balance adjustment (Single color copy mode) 
(No need to adjust normally)
46-25
9D 
(14)
DSPF mode (Copy/Scan/FAX) density adjustment 
(No need to adjust normally)
46-9
9D 
(15)
Automatic color balance adjustment by the user 
(Copy color balance automatic adjustment ENABLE setting and 
adjustment)
26-53
9D 
(16)
Copy gamma, color balance adjustment for each dither (Automatic 
adjustment)
46-54
9D 
(17)
Dropout color adjustment (Normally not required)
46-55
9D 
(18)
Watermark adjustment (Normally not required)
46-66
9E
Printer image 
quality adjustment 
(Basic 
adjustment)
9E 
(1)
Printer color balance adjustment (Automatic adjustment)
67-24
9E 
(2)
Printer color balance adjustment (Manual adjustment)
67-25
9F
Printer image 
quality adjustment 
(Individual 
adjustment)
9F 
(1)
Printer density adjustment (Low density section density adjustment) 
(No need to adjust normally)
67-36
9F 
(2)
Printer high density image density reproduction setting (Supporting 
the high density section tone gap) (No need to adjust normally)
67-34
9F 
(3)
Printer gamma adjustment for each dither 
(Automatic adjustment) (No need to adjust normally)
67-54
9F 
(4)
Automatic color balance adjustment by the user 
(Printer color balance automatic adjustment ENABLE setting and 
adjustment) (Normally unnecessary to the setting change)
26-53
ADJ 10
Manual paper feed tray paper size (width) sensor adjustment
40-2
ADJ 11
DSPF tray paper size (width) sensor adjustment
53-6
ADJ 12
Document size detection 
adjustment
12A
Document size sensor detection point adjustment
41-1
12B
Adjust the sensitivity of the original size sensor
41-2
ADJ 13
Touch panel coordinate setting
65-1
ADJ 14
Fusing paper guide position adjustment
ADJ 15
Print image manual 
magnification ratio, area, 
position adjustment 
(Manual adjustment)
15A
Print image manual magnification ratio adjustment (Main scanning direction) (Print engine)
50-10
15B
Print image manual area adjustment (Main scanning direction, sub scanning direction) (Print 
engine)
50-10 / 50-1
15C
Print image manual position adjustment (Main scanning direction, sub scanning direction) (Print 
engine) (Each paper feed tray)
50-10
ADJ 16
Scan image magnification 
ratio adjustment 
(Manual adjustment)
16A
Scan image magnification ratio adjustment (main scanning direction) (Manual adjustment) 
(Document table mode)
48-1
16B
Scan image magnification ratio adjustment (sub scanning direction) (Manual adjustment) 
(Document table mode)
48-1
16C
Scan image magnification ratio adjustment (main scanning direction) (Manual adjustment) 
(DSPF mode)
48-1
16D
Scan image magnification ratio adjustment (sub scanning direction) (Manual adjustment) 
(DSPF mode)
48-1
ADJ 17
Scan image off-center 
adjustment 
(Manual adjustment)
17A
Scan image off-center adjustment (Manual adjustment) (Document table mode)
50-12
17B
Scan image off-center adjustment (Manual adjustment) (DSPF mode)
50-12 / 50-6
ADJ 18
Copy image position and 
image loss adjustment 
(Manual adjustment)
18A
Copy image position, image loss, and void area adjustment (Manual adjustment) (Document table 
mode)
50-1
18B
Image scanning position adjustment (Manual adjustment) (DSPF mode)
53-8
18C
Copy image position, image loss, void area adjustment (Manual adjustment) (DSPF mode)
50-6
ADJ 19
Finisher and punch unit adjustments (alignment, punch hole position, staple position)
3-10
ADJ 20
DSPF CCD calibration
20A
Shading adjustment (Calibration) (DSPF mode)
63-2
20B
CCD gamma adjustment (CCD calibration) (DSPF mode)
63-3
ADJ 21
DSPF back surface color balance exposure adjustment (Manual adjustment)
46-9
ADJ22
FR density variation 
correction
22A
FR density unevenness automatic correction: all 32-point adjustment (Correction by OC scan)
61-11
22B
FR density unevenness visual inspection correction: 4-point adjustment for each of CMYK (with 
the center fixed) or 31-point adjustment (with the center fixed)
61-12
Job No
Adjustment item list
Simulation
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 3
3. Details of adjustment
 
ADJ 1
Adjust the developing unit
 
1-A
Adjust the developing doctor gap
This adjustment must be performed in the following cases:
* 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.
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 0.775mm in 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
0.775 +/- 0.05mm.
* When inserting a thickness gauge, be careful not to scratch the
developing doctor and the developing roller.
1
2
70mm
70mm
40mm
40mm
70mm
70mm
40mm
40mm
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 4
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.
Marked point (A) on the drive side (left side) of the MG roller.
 
1-B
Adjust the developing roller main pole 
position
This adjustment must be performed in the following cases:
* 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.
1)
Remove the developing doctor cover, and place the develop-
ing unit on a flat surface.
2)
Attach a piece of string to a sewing needle or pin.
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 posi-
tion A of the developing unit frame, and check that it is 46.4 +/-
0.5mm.
If the distance is not within the above range, adjust the devel-
oping roller main pole position in the following procedures.
6)
Loosen the fixing screw of the developing roller main pole
adjustment plate in the rear side of the developing unit, 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.
A
2
3mm
46.4 + 0.5mm
A
46.4+ 0.5mm
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