Circuit
FANCTRL
3
140
VOLH
THERMAL
Thermal sensor
138
Power amp.
COOLING FAN
Q8701,
Q8711
Fan drive
Q6300
VOLH
THERMAL
Q7009
MPU
(Main Microprocessor)
Normal/ Bi-Amp
Powerd Zone-2,3,4
STOP
OFF or
Headphone
OFF or
Headphone
LOW
MID
LOW
MID
HIGH
HIGH
OFF
LOW
HIGH
MID
MID
LOW
LOW
STOP
LOW
LOW
STOP
STOP
STOP
STOP
STOP
STOP
HIGH
LOW
LOW
LOW
LOW
LOW
MID
MID
MID
MID
MID
MID
MID
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
THERMAL(Temparature of thermal sensor)
-30
52 60
63 65
67
95
100
Shut down
immediately
Shut down
immediately
Shut down in
10 minutes
continuously
HIGH
MID
LOW
OFF
Hysteresis control
VOLH(Voltage of VOLH port)
0.35V 0.4V
1.9V 2.0V 2.2V 2.3V
3.3V
HIGH
MID
LOW
OFF
Hysteresis control
Value D/A output of the MPU
OFF
LOW
MID
HIGH
0V
1.7V
2.2V
2.5V
Condition to operate
How to check
1. How to check operation of Cooling Fan.
See “CONFIRMATION OF COOLING FAN OPERATION” in OPERATION CHECK-4.
2. How to check the value of THERMAL and VOLH.
See “CONFIRMATION OF OUTPUT VOLTAGE AND THERMAL SENSOR” in OPERATION CHECK-1.
0V
e.g.(TX-NR636)
TX-NR636/ 737/ 838/ HT-RC660/ HT-R993/ DTR-30.6/ 40.6/ 50.6
OPERATION CHECK-10
COOLING FAN
