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OPERATION CHECK-8
COOLING FAN
Circuit
Thermal sensor
Q6300
Power amp.
Condition to operate
OFF
LOW
THERMAL
MID
HIGH
THERMAL(Temparature of thermal sensor)
-30
Shut down
immediately
VOLH(Voltage of VOLH port)
0.35V 0.4V
OFF
Hysteresis control
How to check
1. How to check Cooling Fan.
See 1-12 in "OPERATION CHECK-2".
2. How to check the value of THERMAL and VOLH.
See 1-7 in "OPERATION CHECK-1".
TX-NR626/727/828/ HT-RC560/ DTR-30.5/40.5/50.5
THERMAL
139
Q701
MPU
(Main Microprocessor)
VOLH
140
Normal/ Bi-Amp
OFF or
LOW
MID
Headphone
LOW
STOP
STOP
LOW
LOW
LOW
LOW
MID
MID
MID
HIGH
HIGH
55 60
62 65
OFF
LOW
Hysteresis control
1.9V 2.0V 2.2V 2.3V
LOW
MID
Value D/A output of the MPU
OFF
0V
LOW
1.7V
MID
2.2V
HIGH
2.5V
FANCTRL
3
VOLH
Powerd Zone-2, 3
OFF or
HIGH
LOW
Headphone
STOP
STOP
STOP
LOW
LOW
LOW
MID
MID
MID
HIGH
HIGH
HIGH
73 75
MID
HIGH
3.3V
HIGH
COOLING FAN
Fan drive
Q8701,
Q8711
MID
HIGH
STOP
STOP
LOW
LOW
MID
MID
HIGH
HIGH
95
100
Shut down in
Shut down
10 minutes
immediately
continuously
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