Separation, Transport Section; Fuser, Paper Exit Section; Developer Section - Sharp SF-2014 Service Manual

2. Separation, transport section

After passing the resist roller section, the paper is transported to the
transfer section. After transfer, the paper is separated from the drum
by the separation electrode and the drum separation pawl, then trans-
ported to the fuser section by the transport belt.

3. Fuser, paper exit section

The toner image transferred on the paper is fused by the heat and
pressure of the upper and the lower heat rollers. After fusing, dis-
charge static electricity on the paper with the discharge brush. Then
the paper is discharged to the copy tray.
•
Temperature control
Thermistor
Heat roller
CPU
Heater lamp
(Heater trouble)
Self diag display
Thermostat
•
Abnormally high temperature (H3)
•
Abnormally low temperature (H4)
•
Thermistor disconnection (H2)
* When the thermostat contact is open, it is required to press the
reset button in the upper side of the thermostat. (The contact is not
reset automatically.)
Heat roller surface
temperature detection
The heat roller is heated by the
heater lamp.
(When the heat roller surface
temperature is 180 C˚ or lower,
the heater lamp is actuated)
Contact open (*)
Abnormal high
temperature

4. Developer section

1 When machine has low toner (low concentration) conition, Toner
and Carrier (Developer) are transported from toner box to devel-
oper box by mixingroller.
Toner box contains Toner and Carrier (Developer)
2 Machine conumed some quantity of toner making copier, but car-
rier (developer) is not consumed.
Increase in quantity of carrer in the developer box, therefore some
quantity of deteriorated carrier overflowed.
3 Deteriorated carrier is transported to deteriorated carrier collection
section in the collection container by mixingroller.
Therefore quantity of carrier in the developer box is regulated.
This operation effects on replacement for deteriorated carrier by
fresh one.
4 On the other hand residual toner in the OPC drum cartridge units
is transported to waste toner collection section in the collection
container by transportoller.
The employment of this system elements the need for replacement of
carrier in the developer box, resulting in a reduction in servicing time
and in servicing costs.
When toner in the toner box is not consumed and the toner density in
the developer unit falls below the specified level, the toner lamp lights
up to indicate the necessity for replacement of the toner cartridge.
Toner in the toner box is exhausted by about 40K copiers. (7% den-
sity copy)
Flow of the new toner
Residual toner on the photoconductor drum
(Cleaned in section and sent to the waste toner collection container)
5 – 2
Toner box
(mixture of toner and carrier)
Waste toner collection
container
Deteriorated developer
(Automatically discharged to the waste toner
collection container)