Functions - Toshiba e-STUDIO556 Service Manual

3.15.3

Functions

(1) Cleaning web
The cleaning web is attached touching the fuser roller by means of the web pushing roller to
remove any toner or paper dust that has stuck to the fuser roller during the fusing process. It is
rolled up by the web motor (M4) with its clean surface always touching the fuser roller. It also
contains silicone oil for coating the surface of the fuser roller, which makes it easier to clean up
any toner or paper dust.
The cleaning web rolled around the roller has been made thinner and lengthened. This has
increased the web rolling up speed and improved the cleaning performance. The cleaning web's
cleaning performance is the same as that of the cleaning roller, so this equipment does not have
a cleaning roller.
3.15.4 Fuser Control Circuit
[ 1 ] Configuration
A forcible power OFF circuit is embedded in this equipment. This circuit detects the overheating of the
fuser unit with the thermistors installed on it. When the surface temperature of either the fuser roller or
the pressure roller has exceeded the specified value, the circuit sends the relay ON signal in order to
shut off the power supply throughout the unit.
Side thermostat
Front thermistor
LGC board
Engine CPU
+5VB
Temperature
control circuit
© 2012 TOSHIBA TEC CORPORATION All rights reserved
Center thermostat
Center
thermistor
IH coil
Pressure roller thermistor
+5VSW
Power supply for photocoupler
Switching signal of power setting
ASIC IH status signal
IH coil energization permitting signal
Duty ratio changing signal
+5VSW
Fig. 3-50
3 - 83
Rear thermistor
Fuser roller
Pressure
roller
IH board
Coil output N
IH power source / drive circuit
Photocoupler
Control circuit
including CPU
AC line
DC line
e-STUDIO556/656/756/856(Ver03)
Power cable
Noise
filter
Breaker
Switching regulator
+5VSW
Relay
L AC input
Fuse
OUTLINE OF THE MACHINE
3