Read Sharp AR-155 (serv.man8) Service Manual online
(3) Thermal control
1. The heater lamp, thermistor, main PWB, DC power supply PWB,
1. The heater lamp, thermistor, main PWB, DC power supply PWB,
and triac within the power supply unit are used to control the
temperature in the fuser unit.
To prevent against abnormally high temperature in the fuser unit, a
thermal breaker and thermal fuse are used for safety purposes.
temperature in the fuser unit.
To prevent against abnormally high temperature in the fuser unit, a
thermal breaker and thermal fuse are used for safety purposes.
2. The surface temperature of the upper heat roller is set to 165˚C
∼
190˚C. The surface temperature during the power save mode is set
to 100˚C.
to 100˚C.
3. The self-check function comes active when one of the following
malfunctions occurs, and an "H" is displayed on the multicopy win-
dow.
dow.
a. When the heat roller surface temperature rises above 240˚C.
b. When the heat roller surface temperature drops below 100˚C
b. When the heat roller surface temperature drops below 100˚C
during the copy cycle.
c. Open thermistor
d. Open thermal fuse
e. When the heat roller temperature does not reach 190˚C within
d. Open thermal fuse
e. When the heat roller temperature does not reach 190˚C within
27 second after supplying the power.
(4) Fusing resistor
Fusing resistor
This model is provided with a fusing resistor in the fusing section to im-
prove transfer efficiency.
General descriptions are made in the following.
Fusing resistor
This model is provided with a fusing resistor in the fusing section to im-
prove transfer efficiency.
General descriptions are made in the following.
General descriptions
Since the upper heat roller is conductive when copy paper is highly
moistured and the distance between the transfer unit and the fusing
unit is short, the transfer current leaks through the copy paper, the
upper heat roller and the discharging brush.
Since the upper heat roller is conductive when copy paper is highly
moistured and the distance between the transfer unit and the fusing
unit is short, the transfer current leaks through the copy paper, the
upper heat roller and the discharging brush.
Saftey device
(Thermal breaker, thermal
fuse)
(Thermal breaker, thermal
fuse)
Triac (in the
power supply unit)
Level of the thermistor is
controlled by the main PWB.
controlled by the main PWB.
With th e signal from the
main PWB, the triac is
main PWB, the triac is
controlled on and o ff.
(power supply PWB )
Heated by the heater
lamp.(950W)
lamp.(950W)
The surface temperature
of the upper heat roller is
sensed by the thermistor.
of the upper heat roller is
sensed by the thermistor.
5. Paper feed section and paper transport section
A. Paper transport path and general operations
(1)
Scanner unit
(6)
Main charger
(11)
Pickup roller
(2)
Copy lamp
(7)
Heat roller
(12)
Manual paper feed tray
(3)
Lens unit
(8)
Pressure roller
(13)
Manual paper feed roller
(4)
LSU (Laser unit)
(9)
Drum
(14)
PS roller unit
(5)
Paper exit roller
(10)
Transfer unit
(15)
Paper feed roller
Paper feed is made in two ways; the tray paper feed and the manual paper feed. The tray is of universal-type, and has the capacity of 250 sheets.
The front loading system allow you to install or remove the tray from the front cabinet.
The general descriptions on the tray paper feed and the manual paper feed are given below.
The front loading system allow you to install or remove the tray from the front cabinet.
The general descriptions on the tray paper feed and the manual paper feed are given below.
(2)
(4)
(1)
(3)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(13)
(12)
(14)
(15)
AR-F151
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