DOWNLOAD Sharp MX-1800N (serv.man14) Service Manual ↓ Size: 5.73 MB | Pages: 62 in PDF or view online for FREE

Model
MX-1800N (serv.man14)
Pages
62
Size
5.73 MB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Section 6 - Adjustments
File
mx-1800n-sm14.pdf
Date

Sharp MX-1800N (serv.man14) Service Manual ▷ View online

MX-1800N  ADJUSTMENTS  6 – 1
MX-1800N
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
ADJ 2
Developing roller main pole position adjustment
ADJ 3
Toner density reference control level setting
ADJ 4
High voltage adjustments
ADJ 4A
Main charger grid voltage adjustment
8-2
ADJ 4B
Developing bias voltage adjustment
8-1
ADJ 4C
Transfer voltage adjustment
8-6
ADJ 5
Image density sensor, image registration sensor 
adjustment
ADJ 5A
Color image density sensor calibration
44-13
ADJ 5B
Color image density sensor, black image density sensor, image 
registration sensor adjustment
44-2
ADJ 6
Image skew adjustment (LSU unit)
64-1/61-4
ADJ 7
OPC drum phase adjustment
ADJ 7A
OPC drum phase adjustment (Auto adjustment)
50-22
ADJ 7B
OPC drum phase adjustment (Manual adjustment)
44-31
ADJ 8
Print engine image magnification ratio adjustment 
(BK) (Main scanning direction) (Print engine section)
ADJ 8A
Print engine image magnification ratio adjustment (BK) (Main 
scanning direction) (Print engine section) (Manual adjustment)
50-10
ADJ 9
Image off-center adjustment (Print engine section)
50-10
ADJ 10
Image registration adjustment (Print engine section)
ADJ 10A
Image registration adjustment (Main scanning direction, sub 
scanning direction) (Auto adjustment)
50-22
ADJ 10B
Image registration adjustment (Main scanning direction) (Manual 
adjustment)
50-20
ADJ 10C
Image registration adjustment (Sub scanning direction) (Manual 
adjustment)
50-21
ADJ 11
Scan image distortion adjustment
ADJ 11A
Scanner (reading) unit parallelism adjustment
ADJ 11B
Scan image (sub scanning direction) distortion adjustment
ADJ 11C
Scan image (main scanning direction) distortion adjustment
ADJ 11D
Scan image distortion adjustment (Whole scanner)
ADJ 12
Scan image focus adjustment (CCD unit position adjustment)
ADJ 13
Scan image skew adjustment (RSPF) (Refer to MX-RPX1 SM.)
ADJ 14
Scan image magnification ratio adjustment 
(Document table mode)
ADJ 14A
Scan image magnification ratio adjustment (Main scanning 
direction) (Document table mode)
48-1
ADJ 14B
Scan image magnification ratio adjustment (Sub scanning direction) 
(Document table mode)
48-1
ADJ 15
Scan image magnification ratio adjustment (RADF 
mode) (Refer to the MX-RPX1 SM.)
ADJ 15A
Scan image magnification ratio adjustment (Main scanning 
direction) (RSPF mode) (Refer to the MX-RPX1 SM.)
48-1
ADJ 15B
Scan image magnification ratio adjustment (Sub scanning direction) 
(RSPF mode) (Refer to the MX-RPX1 SM.)
48-1
ADJ 16
Scan image off-center adjustment
ADJ 16A
Scan image off-center (Document table mode)
50-12
ADJ 16B
Scan image off-center (RSPF mode) (Refer to the MX-RPX1 SM.)
50-12
ADJ 17
Print area (Void area) adjustment (Print engine section)
50-10/50-1
ADJ 18
Copy image position, image loss adjustment
ADJ 18A
Copy image position, image loss adjustment (Document table 
mode)
50-1 (50-2)
ADJ 18B
Copy image position, image loss adjustment (RSPF mode) 
(Refer to the MX-RPX1 SM.)
50-6 (50-7)
ADJ 19
Print lead edge image position adjustment (Printer mode) (Print engine section)
50-5
ADJ 20
Copy color balance/density adjustment
ADJ 20A
63-3 (63-5)
ADJ 20B
Copy color balance adjustment (Auto adjustment)
46-24
ADJ 20C
Copy color balance adjustment (Manual adjustment)
46-21
ADJ 20D
Copy density adjustment (Each color copy mode) (Whole 
adjustment) (Normally unnecessary to adjust)
46-1
ADJ 20E
Copy density adjustment (each monochrome copy mode) (Whole 
adjustment) (Normally unnecessary to adjust)
46-2
ADJ 20F
Copy color balance adjustment (Color balance adjustment at each 
density level in each color copy mode) (Normally not required)
46-10
ADJ 20G
Monochrome copy density adjustment (Density adjustment at each 
density level in each monochrome copy mode) (Normally not 
required)
46-16
ADJ 20H
Gamma/density adjustment in the text image edge section 
(Normally not required)
46-27
MX-1800N  ADJUSTMENTS  6 – 2
3. Details of adjustment
 
ADJ 1
Developing doctor gap 
adjustment
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.
ADJ 20
Copy color balance/density adjustment
ADJ 20I
Copy color balance adjustment (Single color copy mode) (Normally 
not required)
46-25
ADJ 20J
Auto color balance adjustment by the user (Copy color balance auto 
adjustment enable setting and adjustment)
26-53
ADJ 20K
Background process condition setting in the color auto copy mode
46-33
ADJ 20L
Color document identification level (ACS operation) setting
46-33
ADJ 21
Printer color balance/density adjustment
ADJ 21A
Printer color balance adjustment (Auto adjustment)
67-24
ADJ 21B
Printer color balance adjustment (Manual adjustment)
67-25
ADJ 21C
Auto color balance adjustment by the user (Copy color balance auto 
adjustment ENABLE setting and adjustment)
26-54
ADJ 22
Fusing paper guide position adjustment
ADJ 23
Document size sensor adjustment
ADJ 23A
Document size sensor detection point adjustment
41-2
ADJ 23B
Document size sensor sensitivity adjustment
41-2
ADJ 24
Manual paper feed tray paper size (width) sensor adjustment
40-2
ADJ 25
RSPF tray paper size (width) sensor adjustment  (Refer to the MX-RPX1 SM.)
53-7
ADJ 26
Touch panel coordinate setting
65-1
ADJ 27
Image loss, void area, image off-center, image 
magnification ratio auto adjustment with SIM50-28
ADJ 27A
Print image main scanning direction image magnification ratio 
automatic adjustment
50-28
ADJ 27B
Image off-center automatic adjustment
50-28
ADJ 27C
Copy lead edge image reference position adjustment, image off-
center, sub scanning direction image magnification ratio automatic 
adjustment
50-28
ADJ 27D
SPF mode image off-center, image lead edge position, sub 
scanning direction image magnification ratio automatic adjustment
50-28
Job No.
Adjustment item list
Simulation
1
2
40mm
70mm
40mm
70mm
MX-1800N  ADJUSTMENTS  6 – 3
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
0.40 
± 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
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
Toner density reference control 
level setting
This adjustment must be executed in the following cases:
* When developer is replaced.
NOTE: Be sure to execute this adjustment only when developer is
replaced. Never execute it in the other cases.
40mm
70mm
40mm
70mm
2
3mm
A
37.8 + 0.5mm
37.8 + 0.5mm
MX-1800N  ADJUSTMENTS  6 – 4
1) With the front cabinet open, enter SIM25-2.
2) Close the front cabinet.
3) Select a developing unit to be adjusted.
4) When [EXECUTE] key it touched, it is highlighted. The devel-
oping roller rotates, and the toner sensor detects toner density,
and the output value is displayed.
The above operation is executed for 3 minutes, and the aver-
age value of the toner density sensor detection level is set
(saved) as the reference toner density control value.
When the reference toner density control adjustment operation
is completed, [EXECUTE] key display return, to normal from
highlight. This makes you know whether the adjustment opera-
tion is completed or not.
The above operation is executed each of the lower speed
mode and the middle speed mode, and the reference toner
density control value is set for each of them.
NOTE: If the operation is interrupted within 3 minutes, the 
adjustment result is not reflected (enabled).
When [EXECUTE] key is touched during rotation, the opera-
tion is stopped and [EXECUTE] key returns to the normal dis-
play.
If [EE-EU], [EE-EL], or [EE-EG] is displayed, setting of the ref-
erence toner density control value is not completed normally.
5)
Use SIM24-5 to clear the developer counter.
6)
Use SIM44-27 to clear the half-tone correction data.
NOTE:
a)
When replacing developer, always replace all the three
colors of Yellow, Magenta, and Cyan.
If only one color is replaced, color balance may be
adversely affected. Black developer can be replaced indi-
vidually.
b)
After replacement of developer or the photoconductor, be
sure to execute SIM44-27 to clear the half-tone correction
data.
If the above procedure is neglected, the half-tone correc-
tion may not be performed correctly.
 
ADJ 4
High voltage adjustments
 
4-A
Main charger grid voltage adjustment
This adjustment must be executed in the following cases:
* When the MC/DV high voltage power PWB is replaced. 
* When U2 trouble occurs. 
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
1)
Enter SIM8-2 mode.
2)
Select an output mode to be adjusted with the mode key and
the scroll key. 
3)
Enter the adjustment value (specified value) of the middle
speed mode and touch [OK] key.
EXECUTE
M
K
0
SIMULATION NO.25-02
TEST
AUTOMATIC DEVELOPER ADJUSTMENT
EXECUTE
TCD_K
xx
:
TCV_K
xx
:
TCD_C
xx
:
TCV_C
xx
:
TCD_M
xx
:
TCV_M
xx
:
TCD_Y
xx
:
TCV_Y
xx
:
1/1
K
C
M
Y
CLOSE
EXECUTE
0
SIMULATION NO.25-02
TEST
AUTOMATIC DEVELOPER ADJUSTMENT
EXECUTE
AT DEVE ADJ_L_K
xxx
:
AT DEVE VO_L_K
xxx
:
AT DEVE ADJ_L_C
xxx
:
AT DEVE VO_L_C
xxx
:
AT DEVE ADJ_L_M
xxx
:
AT DEVE VO_L_M
xxx
:
AT DEVE ADJ_L_Y
xxx
:
xxx
:
1/2
CLOSE
AT DEVE VO_L_Y
K
C
M
Y
0
SIMULATION NO.25-02
TEST
AUTOMATIC DEVELOPER ADJUSTMENT
EXECUTE
AT DEVE ADJ_L_K
xxx
:
AT DEVE VO_L_K
xxx
:
AT DEVE ADJ_L_C
xxx
:
AT DEVE VO_L_C
xxx
:
AT DEVE ADJ_L_M
xxx
:
AT DEVE VO_L_M
xxx
:
AT DEVE ADJ_L_Y
xxx
:
xxx
:
1/2
CLOSE
AT DEVE VO_L_Y
Y
K
C
M
0
SIMULATION NO.25-02
TEST
AUTOMATIC DEVELOPER ADJUSTMENT
TCD_K
EE-EL
:
TCV_K
:
TCD_C
xx
:
TCV_C
:
TCD_M
EE-EL
:
TCV_M
:
TCD_Y
xx
:
TCV_Y
:
1/1
K
C
M
Y
CLOSE
EXECUTE
or process interrupt
Adjustment completed
Abnormal
end
Error 
display
Error name
Detail of error
EE-EL
EL abnormality
Sensor output level, 1.5V or below; control 
voltage, 8.0V or above
EE-EU
EU abnormality
Sensor output level, 3.45V or above; 
control voltage, 2.0V or below
EE-EC
EC abnormality
Sensor output level, other than 2.5V 
± 0.2V
EXECUTE
EXECUTE
0
A:
A : xxx
B: xxx
C: xxx
;
MIDDLE SPEED GB_K
;
MIDDLE SPEED GB_C
;
MIDDLE SPEED GB_M
SIMULATION
MHV/GRID SETTING AND OUTPUT
xxx
230
850
OK
TEST
CLOSE
EXECUTE
D: xxx
;
MIDDLE SPEED GB_Y
LOW
MIDDLE
0
A:
A: xxx
B: xxx
C: xxx
;
MIDDLE SPEED GB_K
;
MIDDLE SPEED GB_C
;
MIDDLE SPEED GB_M
SIMULATION NO.08-02
MHV/GRID SETTING AND OUTPUT
xxx
230
850
OK
TEST
CLOSE
EXECUTE
D: xxx
;
MIDDLE SPEED GB_Y
LOW
MIDDLE
10-key
or after 30 sec.
NO.
08-02
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  • Here you can View online or download the Service Manual for the Sharp MX-1800N (serv.man14) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp MX-1800N (serv.man14) Copying Equipment. Information contained in Sharp MX-1800N (serv.man14) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.