Canon PC980 Service Manual - Page 44
Inputs to the DC Controller 2/2, DC controller PCB
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CHAPTER 2 BASIC OPERATION 2. Inputs to the DC Controller (2/2) AE sensor PCB +24V J601 +24V J107-4 -3 AE -2 AEREF -1 DC controller PCB When the light reflected by the original increases, the voltage increases. Control panel PCB J301 J111 J111-15 PWOFF J111-16 The keys and the LEDs are wired in a matrix in the control panel PCB, and the DC controller turns on or flashes the LEDs and reads key inputs. SW309 J62 J102-2 DIG1 -3 HEAT0 -4 DIG1 -5 HEAT1 The variation in the resistance of the fixing heater is corrected in three levels based on combinations of 2-bit signals. Figure 2-106 2-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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CHAPTER 2
BASIC OPERATION
COPYRIGHT
©
1999
CANON INC.
CANON
PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-8
2.
Inputs to the DC Controller (2/2)
Figure 2-106
When the light reflected by the original increases,
the voltage increases.
J107-4
-3
-2
-1
+24V
The variation in the resistance of the fixing heater
is corrected in three levels based on combinations
of 2-bit signals.
The keys and the LEDs are wired in a matrix
in the control panel PCB, and the DC controller
turns on or flashes the LEDs and reads key inputs.
AE
AEREF
J111
J301
DC controller PCB
DIG1
HEAT0
DIG1
HEAT1
J102-2
-3
-4
-5
J62
AE sensor PCB
Control panel
PCB
J601
+24V
J111-15
J111-16
PWOFF
SW309