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C.
Fixing
Assembly
and Delivery
Unit
1.
Outline
The
upper
and lower
rollers
of the fixing
assembly
and delivery
roller are driven
by the
main motor
(Ml).
The
upper
roller
is heated
by the
fixing
heater
(HI;
850
W),
and rises in its surface
temperature
causes
the resistance
of the ther-
mistor
(TH) to decrease
and the voltage
of the
fixing
roller temperature
detection
signal
(THI)
to increase.
The
microprocessor
on the
DC controller
controls
the
state
of
the
fixing
heater'
drive
signal
(HTRD), to '1' or to '0'.
During copying
control
at 185°C
In STBY
control
at 160°C
For details,
see Figure 3-39.
The copier
is equipped
with
three
protec-
tion
mechanisms
to prevent
the fixing
heater
from
going ON at the wrong
time.
The microprocessor
monitors
the voltage
of
THI
and indicates
'EOOO' or 'EOOI'
as nec-
essary.
(See p. 3-34.)
If
the
voltage
of
THI
exceeds
4.3
V
(equivalent
of 220°C).
the fixing
rowem-
perature
detection
circuit
causes
HTRD to
go OFF regardless
of the output
of the mi-
croprocessor.
If the .temperature
inside
the thermoswitch
exceeds
210°C.
the thermoswitch
goes OFF
to cut the power to the fixing
heater.
Note:
Once
the
contact
of
the
thermoswitch
(TP)
opens,
the thermoswitch
is not used again un-
less cooled
to 0°C or below.
(The contact
of
the
thermoswitch
will
not
recover
at
room
temperature.)
'
\
,'
',
.____-__-__--_:
I
Power
r"pply/AC driver
Figure
3-38
COPVAIGHT
GXlAA
CANON INC.
CANON HP-1010
RN.0
DEC. 1988 PAINTED
IN JAPAN lIMPRIME
AU JAPONI
3-27
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