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 - 3
3. Peripheral devices
Maintenance cycle : 50K
✕ Check (Clean, replace, or adjust as necessary.) ❍ Clean
▲ Replace
∆
Adjust
✩ Lubricate
❏ Move position
Option name
Part name
When
calling
100K 200K 300K 400K 500K 600K 700K 800K
Remark
Finisher
Transport section
Transport rollers
❍
❍
❍
❍
❍
❍
❍
❍
❍
De-curler roller
(❍)✕
❍
❍
❍
❍
❍
❍
❍
❍
Transport paper
guides
guides
✕
❍
❍
❍
❍
❍
❍
❍
❍
Drive section
Gears
✕
✩
✩
✩
✩
✩
✩
✩
✩
(Specified position)
Belts
✕
✕
✕
✕
✕
✕
✕
✕
✕
Other
Sensors
✕
✕
✕
✕
✕
✕
✕
✕
✕
Discharge brush
✕
✕
✕
✕
✕
✕
✕
✕
✕
Staple unit
Replace unit
at 200K staple.
at 200K staple.
Staple cartridge
User replacement
for every 3000 pcs.
for every 3000 pcs.
Mail-bin
stacker
stacker
Transport section
Transport rollers
✕
❍
❍
❍
❍
❍
❍
❍
❍
Transport paper
guides
guides
✕
❍
❍
❍
❍
❍
❍
❍
❍
Drive section
Gears
✕
✩
✩
✩
✩
✩
✩
✩
✩
(Specified position)
Belts
✕
✕
✕
✕
✕
✕
✕
✕
✕
Other
Sensors
✕
✕
✕
✕
✕
✕
✕
✕
✕
Discharge brush
✕
✕
✕
✕
✕
✕
✕
✕
✕
Saddle finisher,
punch unit
punch unit
Transport section
Transport rollers
✕
❍
❍
❍
❍
❍
❍
❍
❍
Transport paper
guides
guides
✕
❍
❍
❍
❍
❍
❍
❍
❍
Drive section
Gears
✕
✩
✩
✩
✩
✩
✩
✩
✩
(Specified position)
Belts
✕
✕
✕
✕
✕
✕
✕
✕
✕
Other
Sensors
✕
✕
✕
✕
✕
✕
✕
✕
✕
Discharge brush
✕
✕
✕
✕
✕
✕
✕
✕
✕
Staple unit
Replace unit at 300K
staple.
staple.
Staple cartridge
User replacement
for every 5000 pcs.
for every 5000 pcs.
Punch unit
Replace unit at
1000K.
1000K.
ADU
+ Manual feed
+ Manual feed
Paper feed
separation section
separation section
Paper feed
rollers
rollers
(❍)✕
(❍)✕ (❍)✕ (❍)✕ (❍)✕ (❍)✕ (❍)✕ (❍)✕ (❍)✕ Note 3
Transport section
Transport rollers
✕
❍
❍
❍
❍
❍
❍
❍
❍
Transport paper
guides
guides
✕
❍
❍
❍
❍
❍
❍
❍
❍
Drive section
Gears
✕
✩
✩
✩
✩
✩
✩
✩
✩
(Specified position)
Belts
✕
✕
✕
✕
✕
✕
✕
✕
✕
Other
Sensors
✕
✕
✕
✕
✕
✕
✕
✕
✕
Note 3: Replacement reference: Use the counter value of each paper feed port as the replacement reference.
Paper feed section pickup roller, paper feed roller, separation pad: 100K or 1 year
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 4
[DETAILS OF EACH SECTION]
1. Process section
A. General
Toner is attached to electrostatic latent images formed by the laser
beams which were radiated to the OPC drum charged by the main
charger, forming toner images.
beams which were radiated to the OPC drum charged by the main
charger, forming toner images.
The toner images formed on the OPC drum are transferred to
paper by the transfer roller.
paper by the transfer roller.
1
2
4
5
3
No.
Name
Operation
1
Toner cartridge
Supplies toner to the developing unit, and collects waste toner.
2
Developer unit
Mixes toner and carrier, and attaches toner to electrostatic latent images to form visible images.
3
Transfer roller
Transfers toner to the paper.
4
Process drum unit
The electrostatic image formed by the laser on the drum comes in contact with the developer to
form the visible image on the OPC drum.
form the visible image on the OPC drum.
5
Main charger unit
Charges the drum evenly with a negative charge.
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 5
Process Section Composition and Applying Voltage
Composition of process section
30
-500V
(-470)
(-470)
200M
200M
25
µ
A (45ppm)
19
µ
A (35ppm)
-1.8KV
MAX 5KV
Paper dust cleaner
Separation electrode
MAX 8KV
constant current
-650V
(-620V)
Temperature/humidity sensor
opc27 m
ctc27 m
-800V
Toner density sensor
14
14
8
7
1
9
6
2
4
3
13
12
11 10
16
15
5
1
Laser beam
Forms latent electrostatic images on the photoconductor drum. (Writing resolution: 600dpi)
The output from LSU can be set with the simulation. (Basically the initial setup is used.)
The output from LSU can be set with the simulation. (Basically the initial setup is used.)
2
Photoconductor drum
Latent electrostatic images are formed on the photoconductor drum. It attracts toner to the
electrostatic images and transfers them to paper. An OPC drum of 30mm diameter is employed.
electrostatic images and transfers them to paper. An OPC drum of 30mm diameter is employed.
3
Main charger
Applies a high voltage to charge the OPC drum. Of saw teeth type.
4
Screen grid
Charges electric charges generated from the main charger to the OPC drum evenly. -650V, 35cpm
Copy, -620V only for AE.
Copy, -620V only for AE.
5
MG roller
Forms a magnetic brush with developer and puts toner on the OPC drum. -500V, 35cpm
Copy, -470V only for AE.
Copy, -470V only for AE.
6
Developing doctor
Keeps the thickness of developer and toner (magnetic brush) on the MG roller at a constant level.
7
Toner quantity sensor
Detects the quantity of toner in the developing unit. A magnetic sensor of transmission type is
employed.
employed.
8
Temperature/humidity sensor
The temperature and the humidity inside the machine are detected, and process control is
performed according to the detected temperature and humidity.
performed according to the detected temperature and humidity.
9
CRUM-IC
Toner cartridge conditions (destination, toner motor rotating time, empty, near empty, etc.)
10
Transfer roller
Applies a voltage to transfer toner on the OPC drum to paper.
11
Separation electrode
The electrode to separate paper from the OPC drum by the potential difference.
12
Drum separation pawl
The pawl to separate paper from the OPC drum mechanically.
13
Cleaning blade
Made of silicon rubber. Removes remaining toner from the OPC drum. Always in contact with the
drum.
drum.
14
High voltage resistor PWB
Prevents a high voltage from leaking through the paper guide at a high humidity. 200M
Ω
each.
15
Resist roller
Bends paper to adjust the paper feed timing to the process section.
16
Paper dust cleaner
Removes paper dust from the resist roller to reduce mixing of paper dusts into the process section.
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 6
[OPC drum section]
A. General
In this section the laser beam expose's the drum. The latent image
is formed on the OPC drum. Then is sent to the development unit.
is formed on the OPC drum. Then is sent to the development unit.
B. Major parts and signal functions
DM
PSPS
+24V1
PSPS\
1
1
2
2
PHNR-02-H+BU02P-TR-P-H
8FE-BT-VK-N
DSW-L
DM-T
DM\
5
6
DSW-L
GND2
GND2
3
2
1
2
1
4
GND2
DMCLK\
(NC)
(NC)
8
7
7
PCU PWB
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
DM-T
GND2
DM\
CN6
GND2
DSW-F
DSW-F
DSW-F
DMCLK\
9604S-08C
(NC)
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
CN5
+24V1
CRUCLK
+5V2
GND2
CRUSDA
PSPS\
PSPS\
(NC)
B8B-PH-K-S
+24V1
1
DVREM\
DHVREM
MHVREM\
THV+PWM\
MHVREM\
THV+PWM\
6
4
13
14
14
12
GND2
3
7
8
9
8
9
10
5
GBPWM\
11
CN15
DSW-F
THin
DHVPWM\
THV-PWM\
THV-PWM\
THVREM\
2
DVPWM\
9604S-14F
GND2
MHV-T
RD
GR
BL
YL
WH
HV
1
DVREM\
DHVREM
MHVREM\
THV+PWM\
MHVREM\
THV+PWM\
6
4
13
14
14
12
GND2
3
7
8
9
8
9
10
5
GBPWM\
11
DSW-F
THin
DHVPWM\
THV-PWM\
THV-PWM\
THVREM\
2
DVPWM\
1-84432-4(AMP)
GND2
MHV-T
PS-187
SRA-21T-4L
BIAS
PS-187
PS-187
PS-187
WH
WH
MHV
THV
GB
DHV
DV
RD
PS-187
SRA-21T-3
SRA-21T-4L
RD
SRA-21T-3
8
3
1
2
2
5
4
9
7
6
Code
Signal
name
Name
Function/Operation
Type
Note
DM
DM
OPC drum motor
Drives the OPC drum and the transfer section.
DC brushless motor
PSPS
PSPS
Drum separation pawl solenoid
Drives the OPC drum separation pawl
Solenoid
No.
Name
Operation
1
OPC drum
Forms electrostatic latent images by laser beams.
2
Drum separation pawl
Separates paper from the drum.
3
Sub blade (Cleaning seal)
Prevents against toner leakage from the cleaner section.
4
Screen grid
Helps to charge the OPC drum evenly with electric charges provided from the main charger.
5
Saw-teeth charger
Applies a high voltage to charge the OPC drum.
6
Separation pawl oscillation shaft
Moves in the front and rear frame direction to install the separation pawl.
7
Cleaning blade
Cleans remaining toner on the OPC drum.
8
Waste toner transport pipe
Transports toner from the cleaner unit to the waste toner box in the toner cartridge front section.
9
Cleaning unit
Saw teeth charger is cleaned.
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