Sharp AR-M550N - Image Process Section; Composition and Applied Voltage of the Process Section

: Feb. 6 2004
1
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 63
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.
Composition and Applied Voltage of the Process Section
12
5
34
No. Name Operation
1 Toner hopper unit, toner bottle unit Provides toner to the developing unit, and collects waste toner in the front section of the toner bottle
unit (waste toner box section).
2 Developer unit Mixes toner and carrier, and attaches toner to electrostatic latent images to form visible images.
3 Process drum unit Forms images (electrostatic latent images, visible images) on the OPC drum.
4 Transfer unit Transfers toner images to the OPC drum.
5 Main charger unit Charges the OPC drum surface negatively and evenly.
No. Name Functions
1 Laser beams 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.)
2 OPC drum 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.
3 Main charger Applies a high voltage to charge the OLPC drum. The saw teeth type is employed.
4 Screen grid Carries electric charges from the main charger to the OPC drum evenly.
5 MG roller Forms a magnetic brush with developer, and applies toner to the OPC drum. -500V
6 Developing doctor Keeps the thickness of developer or toner layer on the MG roller at a fixed level.
7 Toner concentration sensor Detects toner in the developing tank. The transmission type sensor is employed.
1
-590v -6.2kv (700µA)
-2.0kv
-100v
-500v
+150v
AC4.5kv
+2.0kv
10
8
Ω
Transfer belt
cleaning mode
Cleaning roller
cleaning mode
Transfer mode
Developing
mode
Cleaning
mode
Cleaning mode
4
3
5
1
13
6
8
2
9
11
12
10
7
2.0 - 2.5kv (40µA)
AR-M700N/U
1
1
1
1.0 - 1.5kv (35µA)
AR-M550N/U,
AR-M620N/U