AR-651 (serv.man16). Transfer transporter unit - Sharp Copying Equipment Service Manual (repair manual)

ar-651 (serv.man16) service manual
Model
AR-651 (serv.man16)
Pages
10
Size
462.6 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Transfer transporter unit
File
ar-651-sm16.pdf
Date

Read Sharp AR-651 (serv.man16) Service Manual online

AR-651/810  TRANSFER/TRANSPORT UNIT  13 - 1
13.  TRANSFER/TRANSPORT UNIT
13. 1.  General Description
Transfer/Transport unit consists of the transfer belt unit, fuser unit and transport path through which a
duplex printing is carried out.
This chapter excludes the description of the fuser unit.
Fig. 1 Belt transport unit sectional view
13. 2.  Operation
While the copier is ready, the transfer belt stands by at a position separated from the photosensitive
drum.
When printing starts, the transfer belt is lifted and held in contact against the photoconductive drum.
Voltage from the high-voltage transformer unit is applied to the transfer belt via the power supply roller.
As the surface of the transfer belt is electrified by a plus voltage by dielectric polarization, the paper is
held in contact by static electricity, and the processes of transfer, separation, and paper transport can
be carried out continuously.
After printing ends, the transfer belt is lowered and separated from the photoconductive drum to stand
by again.
1
2
3
4
5
6
7
No.
Name
1
Follower roller
2
Power supply roller
3
Transfer belt
4
Transfer belt drive roller
5
Cleaning blush
6
Recovery auger
7
Cleaning blade
AR-651/810  TRANSFER/TRANSPORT UNIT  13 - 2
13. 3.  Functions
(1) Transfer belt unit
The transfer belt is coated with a high-precision flat rubber belt and has electrical resistance. The
transfer belt unit is divided into a belt support/power supply section and a cleaning mechanism. The
belt support/power supply section supports the belt and rotates to supply power, and the cleaning
mechanism scrapes of toner from the belt surface.
(2) Transfer belt support/power supply mechanism
As shown in Figure 1, the transfer belt is supported by 3 rollers (transfer belt drive roller, follower roller
and power supply roller). Voltage having a polarity opposite to that of the toner on the photoconductive
drum is applied to the power supply roller. The current flowing to the transfer belt is controlled to a
constant current of 80µA. (Though the applied voltage changes as current is constant, the voltage
change is normally within the range +2 to +5kV.) +510 voltage is applied to the follower roller by the
varistor. A voltage probe is required for measurement. To prevent danger, do not use a digital voltmeter.
(3) Transfer belt cleaning mechanism
The cleaning mechanism has two functions, a function for scraping off residual toner and paper dust
from the belt surface by the cleaning blade and cleaning brush and transporting the used toner with the
recovery auger, and a function for bringing the transfer belt into contact with and separating from the
drum.
(4) Cleaning blade
After the paper is separated, the cleaning blade removes paper dust and foreign matter remaining on
the belt surface.
(5) Cleaning brush
The cleaning brush is electroconductive for electro-statically cleaning the toner. A voltage opposite to
that of the toner is applied to the toner. The current flowing to the brush is controlled to a constant
current of 5µA. (Though the applied voltage changes as current is constant, the voltage change is
normally within the range +100 to +500V.) A voltage probe is required for measurement. To prevent
danger, do not use a digital voltmeter.
(6) Recovery auger
The recovery auger transports the scraped toner to the used toner transport auger section.
(7) Transport guide
The transport guide guides the paper that is held in contact by static electricity to the fuser unit. It is
made of the material that prevents electrification caused by the friction with the paper.
AR-651/810  TRANSFER/TRANSPORT UNIT  13 - 3
(8) Belt transport unit lock/unlock mechanism
The belt transport unit is locked inside the copier. It is structured in such a way that it is locked when
a paper jam is cleared, and can be drawn out towards you.
The belt transport unit has a function for separating the transfer belt from the drum and a function for
preventing erroneous operation of the handle when it is drawn out.
When the handle is rotated clockwise when viewed from the front, the belt transport unit can be
drawn out horizontally.
When the belt transport unit is inserted into the copier and the handle is rotated in counterclockwise
as seen from the front, the unit (at the vertical position) is locked.
If the belt transport unit is not completely inserted into the copier, the handle cannot be rotated from
the horizontal position.
(9) Damp heater (for preventing condensation)
The damp heater is located under the transfer belt, and is powered when the main power switch is
turned OFF.
Standard accessories: TWD, SAD, ASD, AUD
Options: Other than the above
(10) Transfer belt drive unit
Drive is transferred from the transfer belt motor, travels via the timing belt and the relay gears, and is
transmitted to the transfer belt drive gear to rotate the drive roller. Drive is transmitted to the belt
transport unit via a gear having a planetary joint.
(11) Transfer belt contact/release mechanism
This mechanism has two functions: separating the transfer belt from the photoconductive drum when a
jam occurs and bringing the transfer belt in touch with it when copying is started.
The rotation of cam by a driving force, which has been transmitted by the gear from the cam motor,
makes the rear side lever in the transfer belt move up and down.
The transfer belt is separated from/brought in touch with the photoconductive drum by handling the
lever vertically.
The cam phases are controlled by two sensors.
(12) Duplex printing transport section
When carrying out a duplex printing, reversed paper goes through this section.
AR-651/810  TRANSFER/TRANSPORT UNIT  13 - 4
13. 4.  Disassembly and Replacement
[A]  Transfer belt unit
(1) Open the front cover, turn the handle clockwise
and pull out the transfer/transport unit.
Connector
(2) Remove 1 screw and take off the handle.
(3) Remove 2 screws and take off the cover.
(4) Disconnect 2 connectors, remove 1 clip and take
off the front side bearing. Then remove 4 screws
and take off the transfer belt unit.
Note: When installing the transfer belt unit, install it as
the lever comes under the cam.
Clip
Cam
Lever
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Here you can read online and download Sharp AR-651 (serv.man16) Service Manual in PDF. AR-651 (serv.man16) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp AR-651 (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.