5 ] Transport And Fusing; Sections; Outline; Basic Composition And Functions - Sharp AR-5132 Service Manual

[5] TRANSPORT AND FUSING

SECTIONS

1. Outline

The AR-5132 allows paper transport of max. A3 (11" × 17") to min.
A5 (8 1/2" × 5 1/2").
After transfer of images, the paper is separated from the drum and
transported to the fusing section by rotation of the resist roller and the
transport belt.
The transport section is provided with the separation sensor (PSD).
This sensor detects separation of paper and is used for taking the
drive timing of the duplex gate solenoid (DGS) after fusing.

2. Basic composition and functions

(1) Transport section
1
Transport belts (2 pcs.)
The transport belts are corrugated to push the rear edge of paper.
Paper
Transport belt
2
Separation sensor (PSD)
This is a transmission type photo sensor and is attached to the
chassis of the main body.
3
Suction fan motor and ozone filter
Ozone generated in the process high voltage section is absorbed
by the filter.
(2) Fusing section
1
Upper heat roller
This roller is teflon-coated in the shape of a reversed crown.
2
Lower heat roller
This roller is a silicon rubber roller in the shape of a crown.
3
Upper cleaning roller
This roller, impregnated with silicon oil, is used to remove dirt from
the upper heat roller to provide better separation of paper and
lengthens the life of the heat roller.
4
Separation pawl
Four separation pawls which are teflon-coated are used for the
upper heat roller for reducing friction.
Two separation pawls are used for the lower heat roller.
5
Upper/lower separation function
The upper heat roller section and the lower heat roller section can
be separated from each other for better serviceability.
6
Division of the drive system
The fusing unit is driven by the main drive unit. Since the fusing
section is manually fed in case of a paper jam, a spring clutch is
provided in the main drive gear to prevent that an excessive load
is applied to the gears.
Stirring roller
MG roller
Transport
roller (upper)
Transport
roller (lower)
Paper feed unit
Paper feed unit
[6] HIGH VOLTAGE SECTION
Transport
direction
1. Outline
There are three kinds of chargers; the main charger, the transfer
charger, and the separation charger. The main charger employs the
scorotron system. The drum surface is charged negatively and
uniformly by electric charges controlled by the screen grid which is
positioned between the charger and the drum.
The transfer charger is used to transfer toner images which are on
the drum to the copy paper. A negative high voltage is applied to the
back of the copy paper.
The separation charger applies AC corona to the copy paper to
eliminate a potential difference between the drum in order to perform
separation.

2. Basic composition

(1) Main charger high voltage transformer (MHVG)
Standard mode
Photo mode
TSM mode
Printer mode
(2) Transfer charger high voltage transformer
(THVG)
+13.5µA (Electrode sheet front/rear balance difference: within 3µA)
(3) Separation charger high voltage transformer
(SHVG)
DC component voltage: –400±10V
5 – 1
Drum unit
Drum motor
Main drive unit
DV drive unit
Cleaner unit Suction unit
PS roller
Multi paper
ADU drive unit
feed unit
Auto duplex
Paper feed
copy unit
speed change
unit
(High speed)
(Low speed)
Paper feed
drive unit
Grid voltage
–490V
–490V
–440V
–460V
Main motor
Cleaning
roller
Fusing unit
Reverse roller
Paper exit roller
Developing bias
voltage
–400V
–400V
–350V
–400V