Read Sharp AR-M550 (serv.man12) Service Manual online
AR-M550/M620 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.
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.
the transfer belt.
Composition and Applied Voltage of the Process Section
1
2
5
3
4
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).
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.)
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.
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.
-590v
-6.2kv(700
µ
A)
-2.0kv
-300v
+500v
-150v
AC4.5kv
(P-P)
(P-P)
+2.0kv
(35
µ
A)
(1.5 - 2.0kv)
10
8
Ω
Transfer belt
cleaning mode
cleaning mode
Cleaning roller
cleaning mode
cleaning mode
Cleaning mode
Transfer mode
Cleaning
mode
mode
Developing
mode
mode
4
3
5
1
3
6
8
2
9
11
12
10
7
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