Canon ImageRunner iR8500 Series Service Manual page 505

Voltage according to the
reading of the main thermistor
J508B
Voltage according to the
1
reading of the sub thermistor
M-TEMP
7
0V
8
S-TEMP
9
0V
10
Upper fixing roller
20
Main
heater
J505A
1
Sub heater
Thermal switch
MHDTC
10
MH-ON
11
AC
0V
12
SH-ON driver
13
SHDTC
14
ZEROCROSS
15
0V
16
100/200V detect
17
When '1', the main heater goes ON.
J512A
1
When '0', the AC relay is cut off.
24V
10
Relay-OFF
11
17
F-10-22
Sub thermistor
Main thermistor
Turns off the AC
RLY
line at 228˚C.
Relay
When the sub heater is powered, '0'.
Relay PCB
Front cover
Chapter 10
10-19