AR-M351U, AR-M451U (serv.man11). Maintenance details of following sections, 1-Process - Sharp Copying Equipment Service Manual (repair manual). Page 2

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 5

30

-500V
(-470)

200M

200M

25

µ

A (45ppm)

19

µ

A (31/35ppm)

-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.)

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.

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.

5

MG roller

Forms a magnetic brush with developer and puts toner on the OPC drum. -500V, 35cpm 
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. 

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.

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.

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.