Canon PC720 Service Manual - Page 44

J107-4

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IMOPERATIONS AND TIMING 2. Inputs to the DC Controller (2/2) +24V -5 J107-4 -4 -3 -2 J401-1 -1 -2 -3 -5 AEREF AE FLEXP AE sensor PCB Intensity sensor PCB Control panel J111 J301 cmt ) SW409 Main switch DC controller PCB when reflected light increases, voltage lowers. when light from fluorescent lamp increases, voltage lowers. Keys and LEDs are wired in a matrix on the control panel PCB; the DC controller reads the key inputs and turns on or flashes the LEDs. J102-2 -3 -4 -5 -6 -7 DIG1 HEATO DIG1 HEAT1 DIG1 HEAT2 Combinations of 3-bit signals are used to correct the variations in the resistance of the fixing heater in 7 settings. 3 - 4 Figure 3-104 COPYRIGHT © 1994 CANON INC. CANON PC7207401756770 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)

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IM
OPERATIONS
AND
TIMING
2.
Inputs
to
the
DC
Controller
(2/2)
DC
controller
PCB
+24V
-5
J107-4
-4
-1
AEREF
AE
FLEXP
when
reflected
light
increases,
voltage
lowers.
when
light
from
fluorescent
lamp
increases,
voltage
lowers.
-3
-2
-2
-3
J401-1
-5
AE
sensor
Intensity
PCB
sensor
PCB
J111
Control
panel
Keys
and
LEDs
are
wired
in
a
matrix
on
the
control
panel
PCB;
the
DC
controller
reads
the
key
inputs
J301
and
turns
on
or
flashes
the
LEDs.
cm
t
)
SW409
Main
switch
J102-2
DIG1
HEATO
DIG1
HEAT1
DIG1
HEAT2
Combinations
of
3
-bit
signals
are
used
to
correct
the
variations
in
the
resistance
of
the
fixing
heater
in
7
settings.
-3
-4
-5
-6
-7
Figure
3-104
3
-
4
COPYRIGHT
©
1994
CANON
INC.
CANON
PC7207401756770
REV.O
AUG.1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)