AR-810 (serv.man16). Developer unit - Sharp Copying Equipment Service Manual (repair manual)

ar-810 (serv.man16) service manual
Model
AR-810 (serv.man16)
Pages
21
Size
585.54 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Developer unit
File
ar-810-sm16.pdf
Date

Read Sharp AR-810 (serv.man16) Service Manual online

AR-651/810  DEVELOPER UNIT  12 - 1
12.  DEVELOPER UNIT
12. 1.  Construction
This chapter describes about the following units related to the development process, parts, control
circuit, etc.
• Toner cartridge drive unit
• Toner recycle unit
• Developer unit
Developer material
Mixer unit
Paddle
Transport sleeve (magnetic roller)
Upper/Lower developer sleeve
Doctor blade
Auto-toner sensor
Scattered toner recovery roller
• Developer unit drive section
Drum
Upper developer sleeve
Transport sleeve
Doctor blade
Paddle
Mixer unit
Auto-toner sensor
[Developer unit sectional view]
Lower developer sleeve
Scattered toner recovery roller
AR-651/810  DEVELOPER UNIT  12 - 2
12. 2.  Functions
(1) Toner cartridge drive unit
The toner cartridge is filled with toner and supplies it to the developer unit with the driving of the new
toner supply motor.
(2) Toner recycle unit
This copier takes a toner recycle method. The toner recovered from the drum surface with the
cleaner is transported to the developer unit by the toner recycle unit and then reused.
(3) Developer unit
a. Developer material
The developer material consists of the carrier and toner. The carrier is made up of the
electrically conductive ferrite which ranges in size from 30~100µm and the toner is made up of
the resin particles ranges in size from 5~20µm. Since the developer material gets deteriorated
over time with use, regular replacement is needed.
b. Mixer unit
When stirring the developer material, the carrier and toner create a static charge when mixed,
the carrier develops a positive (+) charge and the toner develops a negative (–) charge. The toner
adheres to the drum surface as a result of the electrostatic force.
c. Paddle
The paddle supplies the developer material stirred with the mixer unit to the transport sleeve
and gets the material separated from the lower developer sleeve back to the mixer.
d. Transport sleeve/Developer sleeve (magnetic roller)
These rollers are made of aluminum each having a magnet inside. With this magnet, the developer
material is absorbed to form the magnetic brush. The magnet is fixed, so only its ambient sleeve
rotates. By this rotation, the developer material is transported to the developer sleeve from the
transport sleeve. Then the magnetic brush formed at the developer sleeve moves on the drum
surface like a sweeping broom and the development is carried out.
e. Doctor blade
This is for controlling the amount of the developer material which is to be transported from the
transport sleeve so that the magnetic brush can get in touch with the drum surface properly.
f. Auto-toner sensor
To output a normal image, the proportion (toner density ratio) of the carrier and toner in the
developer material must remain constant. The auto-toner sensor detects the toner ratio in the
developer material via the magnetic bridge circuit and supplies the toner from the toner cartridge
and recycle toner hopper by driving the new toner supply motor and recycle toner hopper motor
when the toner starts to run short.
AR-651/810  DEVELOPER UNIT  12 - 3
g. Scattered toner recovery roller
This is a roller for trapping and recovering the toner scattered from the developer sleeve not to
get outside of the developer unit.
AR-651/810  DEVELOPER UNIT  12 - 4
12. 3.  Developer Unit Drive
Transport sleeve gear
(G23)
Idle gear
  (G19)
Idle gear
(G30/16)
[Front side]
Scattered toner
 recovery roller gear
(G20)
Idle gear
 (G20)
Front paddle gear
          (G18/16)
Mixer gear 1
 (G45/G24)
Idle gear
  (G24)
Idle gear
  (G20)
Upper developer sleeve gear
     (G17)
Lower developer sleeve gear
    (G17)
Drive input gear
        (G27)
Rear paddle gear
         (G31)
Mixer gear 2
      (G45)
[Rear side]
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Here you can read online and download Sharp AR-810 (serv.man16) Service Manual in PDF. AR-810 (serv.man16) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp AR-810 (serv.man16) Copying Equipment. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.