Image Process Section; Composition And Applied Voltage Of The Process Section - Sharp AR-M550N Service Manual

: Feb. 6 2004
1

4. Image 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.
The toner images formed on the OPC drum are transferred to paper by
the transfer belt.
No. Name
1 Toner hopper unit, toner bottle unit
2 Developer unit
3 Process drum unit
4 Transfer unit
5 Main charger unit

Composition and Applied Voltage of the Process Section

1
Cleaning roller
cleaning mode
-2.0kv
Cleaning mode
AC4.5kv
-100v
No. Name
1 Laser beams
2 OPC drum
3 Main charger
4 Screen grid
5 MG roller
6 Developing doctor
7 Toner concentration sensor
4
Provides toner to the developing unit, and collects waste toner in the front section of the toner bottle
unit (waste toner box section).
Mixes toner and carrier, and attaches toner to electrostatic latent images to form visible images.
Forms images (electrostatic latent images, visible images) on the OPC drum.
Transfers toner images to the OPC drum.
Charges the OPC drum surface negatively and evenly.
9
8
Transfer belt
cleaning mode
2
+2.0kv
11
Transfer mode
12
1.0 - 1.5kv (35µA)
AR-M550N/U,
AR-M620N/U
2.0 - 2.5kv (40µA)
1
AR-M700N/U
Forms electrostatic latent images on the OPC drum. (Writing resolution: 600dpi)
Radiated from the LSU. The output can be set with the simulation. (Basically not changed from the default.)
Electrostatic latent images are formed by laser beams. Toner is attracted to the latent electrostatic images
and transferred to paper. An OPC drum is employed. The diameter is 80mm.
Applies a high voltage to charge the OLPC drum. The saw teeth type is employed.
Carries electric charges from the main charger to the OPC drum evenly.
Forms a magnetic brush with developer, and applies toner to the OPC drum. -500V
Keeps the thickness of developer or toner layer on the MG roller at a fixed level.
Detects toner in the developing tank. The transmission type sensor is employed.
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 63
5
3 2
Operation
-590v -6.2kv (700µA)
1
13
10
4
1
3
6
5
7
Cleaning Developing
mode mode
Ω
8
10
+150v -500v
1
Functions
1