Onkyo TX-SR606 Service Manual page 96

OPERATION CHECK-5
COOLING FAN
Note : MWT, MWO, MWF type only
Circuit configuration
Power amplifier
FL
FR
C
SL
SBR
SR
SBL
Condition to operate
The cooling fan will stop or rotate at high speed or low speed under the following condition.
Operation of Cooling Fan
T ( C) 55 to 110
Thermal sensor
-30 to 55
temperature
Output sensor
Thermal sensor
Q6380
THERMAL
136
Q701
Main Microprocessor
VOLH
135
VOLH (V)
VOLH port of MPU
0 to 0.35 0.35 to 1.75
High Speed High Speed
Stop Low Speed
Fan drive
Q9101, 9102
FANCTRL
3
Q9111, 9112
1.75 to 3.3V
High Speed
High Speed
TX-SR606
Cooling fan