Sharp MX-M350 Service Manual page 51

Process Section Composition and Applying Voltage
Separation electrode
12
-1.8KV
11 10
-800V
25µA (45ppm)
15
19µA (35ppm)
MAX 5KV
Paper dust cleaner
200M
14
Composition of process section
1 Laser beam
2 Photoconductor drum
3 Main charger
4 Screen grid
5 MG roller
6 Developing doctor
7 Toner quantity sensor
8 Temperature/humidity sensor
9 CRUM-IC
10 Transfer roller
11 Separation electrode
12 Drum separation pawl
13 Cleaning blade
14 High voltage resistor PWB
15 Resist roller
16 Paper dust cleaner
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 5
opc27 m
ctc27 m
3
13
4
2
30
6
5
16
Toner density sensor
8
200M
14
Temperature/humidity sensor
-500V
(-470)
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.)
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.
Applies a high voltage to charge the OPC drum. Of saw teeth type.
Charges electric charges generated from the main charger to the OPC drum evenly. -650V, 35cpm
Copy, -620V only for AE.
Forms a magnetic brush with developer and puts toner on the OPC drum. -500V, 35cpm
Copy, -470V only for AE.
Keeps the thickness of developer and toner (magnetic brush) on the MG roller at a constant level.
Detects the quantity of toner in the developing unit. A magnetic sensor of transmission type is
employed.
The temperature and the humidity inside the machine are detected, and process control is
performed according to the detected temperature and humidity.
Toner cartridge conditions (destination, toner motor rotating time, empty, near empty, etc.)
Applies a voltage to transfer toner on the OPC drum to paper.
The electrode to separate paper from the OPC drum by the potential difference.
The pawl to separate paper from the OPC drum mechanically.
Made of silicon rubber. Removes remaining toner from the OPC drum. Always in contact with the
drum.
Prevents a high voltage from leaking through the paper guide at a high humidity. 200MΩ each.
Bends paper to adjust the paper feed timing to the process section.
Removes paper dust from the resist roller to reduce mixing of paper dusts into the process section.
MAX 8KV
constant current
1
-650V
(-620V)
7
9