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8. FUSING
(‘Y
.
-Thefusingunitpennanen
tly fixes the toner image onto
the
paper.
This
is accomplished by a
he&d
roller.
The
_
upper
fusing roller, which is heated by a
Hater
L&p
built into it, melts the toner and then
the
upper
and lower
fusingrolkspressthemeltitcmerintothepaper.
-
The thermistor
ml)
detects the temperature
of
the
upper
fusing
rok
for fusing tcmpemture controL
-
Ibe
thermostat
(IX)
turns OFF as it
senses
an
abnamally
high
temperatunz.
these&y
cutting
oEcmnnt
to the
Heater Lamp
021).
: Fusing Temperature Control Circuit
-
The
tbamistor
(TEl) detects
the
suface
tan-
of
the
upper fusing roller and inputs the carrespanding
analog voltage.
to
MIPU.
-TheHeaterLamp~l)istumedONorOFFbyasignalfromMPUou~accardingtothetemperature
detected by the
tbermistar.
thereby
controlling
the tempenture of the upper
fusing
roller.
-
Whn
the thermistor detects
~JI
abnormally high temperature.
MKJ
forces
the
Heater Lamp OFF.
.
PWEA
in
Thermistor (THl) Detects Analog
Voltagje
Thermistor
: Fusing Unit Temperature Control
1. During warm-up
The
@T@I
starts
w&m-up
to
attah
a temperature of approx.
190°C
when the power
ssvitchistmnedON.
c-.
t
2. During print
cycle
On
receiving
a
print camman&
the
printez
starts a temperature control cycle to keep the
uppa
fusing rollix temperature at approx.
MPC
3.
During
standby
‘I&
uppex
fusing
rokr
temperatute
is maintained at approx.
1WC.
4. Energy saving
The
contxoller
sigrk
turns
OFF the. Heater Lamp.
Temperature Curve
.
. . . . .
. . . . . . . . . ..." . . . . . . . . . . .
I
. . . . . . . . . . . . . .
I
. . . .
Thermistor
lhrmostat
blower
6N
!
I
;
I
b
2 min.
i
5 min.
I
5 min.
I
‘i
-I-
-
I-
AHeater
OFF
i
, Time
I
Lower Fusing Roller
c-7