Sharp MX-M350N / MX-M350U / MX-M450N / MX-M450U (serv.man5) Service Manual ▷ View online
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 75
2) Remove the connector and the screw, and remove the PCU
PWB.
∗
When replacing the PCU PWB, replace the EEPROM on the
PCU PWB which is to be replaced.
PCU PWB which is to be replaced.
a-4. Mother PWB
1) Remove the fusing unit.
2) Remove the paper exit reverse unit.
3) Remove the front cover right.
4) Remove the HDD cover.
5) Remove the MFP controller PWB unit.
6) Remove the cooling duct.
7) Remove the controller duct.
8) Remove the screw and the connector, and remove the main
duct, the sub duct, and the box cooling duct lower.
9) Remove the screw, and remove the controller box upper.
10) Remove the screw, and remove the mother PWB.
13. Fan motor
A. Maintenance and parts replacement
a-1. Controller cooling fan motor 1
a-2. Controller cooling fan motor 2
1) Pull out the left door.
No.
Unit
Parts
a
1
Controller cooling fan motor 1
2
Controller cooling fan motor 2
3
Ozone exhaust fan motor
a-3
a-2
a-1
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 76
2) Remove the screw, and remove the rear cabinet.
3) Remove the screw, and remove the paper exit upper cabinet.
4) Remove the screw, and remove the left rear cabinet.
5) Remove the screw, and remove the front left upper cabinet.
6) Remove the screw, and remove the paper exit tray cabinet.
7) Remove the screw, and remove the front right upper cabinet.
8) Remove the front door.
9) Remove the screw, and remove the cooling fan duct upper.
10) Remove the snap band, the screw, and the connector, and
remove the fan fixing plate.
11) Remove the screw, and remove the controller cooling fan
motor 1.
∗
When installing the fan, note the fan direction.
12) Remove the connector and the screw, and remove the control-
ler cooling fan motor 2.
∗
When installing the fan, note the fan direction.
a-3. Ozone exhaust fan motor
1) Pull out the left door.
2) Remove the rear cabinet.
3) Remove the paper exit upper cabinet, the left rear cabinet, and
the front left upper cabinet.
4) Remove the paper exit tray cabinet, the front right upper cabi-
net, and the front door.
5) Remove the screw, and remove the controller duct.
6) Remove the connector and the screw, and remove the ozone
exhaust fan motor.
∗
When installing the fan, check the indication arrow and note the
fan direction.
fan direction.
MX-M350/M450 N/U ADJUSTMENTS 8 - 1
[8] ADJUSTMENTS
1. Process section
A. Doctor gap adjustment
This adjustment is performed in the following cases:
• When developer is scattered.
• When an uneven image is produced.
1) Remove the developer cartridge and the developing unit from
the machine.
2) Remove the DV cover and the developer from the developing
unit.
3) Remove the DVR cover, the DVF handle, the idle correction
plate assembly, and the HG gear 22T, insert a thickness gauge
(0.46mm) as shown in the figure below, and check that the
clearance is within the specified range.
(0.46mm) as shown in the figure below, and check that the
clearance is within the specified range.
If the clearance is not within the specified range, adjust the doctor
gap in the following procedures.
gap in the following procedures.
4) Loosen the developing doctor fixing screw A.
5) Insert the thickness gauge (0.46mm) again as shown in the
figure below.
6) Push the developing doctor in the arrow direction and tighten
the fixing screw.
7) Check the developing doctor gap. If the clearance is within the
specified range, fix the screw with screw lock.
8) After completion of the job, apply screw lock.
<Adjustment specification>
B. MG roller main pole position adjustment
This adjustment is performed in the following cases:
• When developer is scattered.
• When an uneven image is produced.
1) Remove the developer cartridge and the developing unit from
the machine.
2) Remove the DV cover and the developer from the developing
unit.
3) Remove the DVF handle and put the developing unit on a flat
surface.
4) Bind a string to a needle.
5) Hold the string and move the needle toward the MG roller.
(Since the MG roller diameter is small, use of a clip cannot
make an accurate adjustment.)
make an accurate adjustment.)
6) With the needle tip 2 - 3 mm apart from the MG roller surface,
mark the point on the MG roller in the elongated line of the
needle.
(Keep the needle and the MG roller apart from each other.)
needle.
(Keep the needle and the MG roller apart from each other.)
7) Measure the distance from the marking position to the P sur-
face of the developing unit, and check that the distance is
within the specified range.
within the specified range.
If the distance is not within the specified range, perform the adjust-
ment in the following procedures.
ment in the following procedures.
8) Loosen the fixing screw of the main pole fixing plate.
No.
Section
Adjustment item
1
Process
section
section
A Doctor gap adjustment
B MG roller main pole position adjustment
C High voltage output adjustment
C High voltage output adjustment
2
Image
check,
adjustment
check,
adjustment
A Adjustments
on the engine
side
side
<1> LSU right angle
adjustment
<2> Print off-center
adjustment
<3> Each tray resist
amount setting
<4> Self print lead edge
adjustment
<5> Front/rear and left/right
void amount setting
B Adjustment
on the
scanner side
scanner side
<1> OC scan distortion
adjustment
<2> SPF height adjustment
<3> SPF scan distortion
adjustment
<4> OC scan magnification
ratio adjustment
<5> SPF scan
magnification ratio
<6> OC scan lead edge
adjustment
<7> SPF scan lead edge
adjustment
<8> Original off-center
adjustment
3
Scanner
section
section
A OC scan distortion adjustment
B Vertical image distortion balance
B Vertical image distortion balance
adjustment
C Vertical image distortion balance
adjustment
D Vertical (sub scanning direction) distortion
adjustment
E Height adjustment of original detection light
emitting unit
F Original size detection photo sensor check
G Original size detection photo sensor
adjustment
H Image density adjustment
I
DSPF width detection adjustment
Specification
Ambient
temperature
Both sides
(Position at 20 - 50mm)
(Position at 20 - 50mm)
0.45±0.03mm
5 - 30°C
Center
0.45 - 0.60mm
20mm
20mm
MX-M350/M450 N/U ADJUSTMENTS 8 - 2
9) Move the adjustment plate in the arrow direction and adjust.
<Adjustment specification>
C. High voltage output adjustment
(1) Developing bias output check and setup
1) Remove the rear cabinet to allow checking of the high voltage
monitor output pin.
2) Execute the simulation of the target high voltage.
(See the table below.)
3) Select the mode to be set with 10-key, and press START key.
4) Enter the set value with 10-key and press START key. The set
value is outputted for 30 sec.
5) Apply a high voltage tester between the measurement pin and
the frame.
Note: Take care not to short the measuring pin and the frame.
6) The unit stops after 30 sec of output.
Specification
Marking position
Measure from
the P surface above.
the P surface above.
54.2mm
P
Default
Set range
Measurement
pin
High voltage
probe
impedance
Monitor output voltage
Set value
MC grid MAIN GRID
(SIM 8-2)
(SIM 8-2)
AUTO
AE mode
45PPM: -650V±5V
35PPM: -620V±5V
35PPM: -620V±5V
45PPM: 645
35PPM: 615
35PPM: 615
200~900
CN2-7
100M
Ω
CHARACTER Text mode
-650V±5V
645
200~900
MIX
Text/Photo mode
-650V±5V
645
200~900
PHOTO
Photo mode
-650V±5V
645
200~900
PRINTER
Printer mode
-650V±5V
645
200~900
FAX
Fax mode
-650V±5V
645
200~900
Transfer current
(THV+ (SIM 8-6)
(THV+ (SIM 8-6)
FRONT
Front
45PPM: 267
35PPM: 220
35PPM: 220
0~620
BACK
Back
45PPM: 310
35PPM: 267
35PPM: 267
0~620
Developing bias DV
BIAS (SIM 8-1)
BIAS (SIM 8-1)
AUTO
AE mode
45PPM: -500V±5V
35PPM: -470V±5V
35PPM: -470V±5V
485
0~745
CN2-1
100M
Ω
CHARACTER Text mode
-500V±5V
485
0~745
MIX
Text/Photo mode
-500V±5V
485
0~745
PHOTO
Photo mode
-500V±5V
485
0~745
PRINTER
Printer mode
-500V±5V
485
0~745
FAX
Fax mode
-500V±5V
485
0~745
PLUS
Positive bias
+150V±5V
150
0~255
Separation voltage SHV
(SIM 8-17)
(SIM 8-17)
FRONT
Front
45PPM: +0.22±0.1V
35PPM: +1.37V±0.1V
45PPM: 160
35PPM: 120
35PPM: 120
0~240
CN2-3
10M
Ω
BACK
Rear
45PPM : +0.22±0.1V
35PPM: +1.37V±0.1V
45PPM: 160
35PPM: 120
35PPM: 120
0~240
Transfer voltage THV
(SIM 8-17)
(SIM 8-17)
-800V±10V
780
0~1250
CN2-5
10G
Ω
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