Conditions For Switching The Rotaions Speed Of The Fan - Pioneer SX-LX70SW Service Manual

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5.7 CONDITIONS FOR SWITCHING THE ROTAIONS SPEED OF THE FAN

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A fan is provided with this unit. Its rotation speed can be switched between Low and High by taking the feedback voltage ( 0 V
to 5 V) from DAMP output as FANINFO described below.
1. Conditions for switching the rotation speed from High ⇔ Low
In a case either DAMP output is over 0.125 W (1.0 V) /8Ω, or all output is under the value
• If the FAN INFO port, which are monitored every 30 ms, matches 100 times, the rotation speed is determined as below.
FAN INFO port (37Pin) = " H " and FAN CONT (81M) = " H " ⇒ Low speed
FAN INFO port (37Pin) = " L " and FAN CONT (81M) = " L " ⇒ High speed
• When the state is other than POWER ON, the roation speed is fixed to Low.
2. Fan drive circuit and drive voltage
The fan drive circuit and the drive voltages at low/high rotation speed are shown below:
AMP ASSY OUTPUT DETECTION
SP+
SP-
TE
L 13942296513
FAN DET
H : Low speed
L : High speed
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VS+5
2SA1576A
+
OUTPUT SELECT SETTING
HIGH ⇔ LOW
0.125 W (1.0 V) / 8 Ω
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2 9
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MAIN ASSY FAN VOLTAGE SWITCH
VSF+12
FAN DET
2SC4081
UDZS8R2
Q Q
3 6 7 1 3 1 5
FANCONT
DTC124EUA
FANCONT
H : Low speed
L : High speed
Low speed
High speed
Note: The above voltage values are references.
They differ from product to product.
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SX-LX70SW
7
8
9 4 2 8
VSFAN
2SD1664
+
0 5 8 2 9 9 4 2 8
C
B
E
Power Voltage (V)
VSF+12 12.0
VSFAN 7.3
VSF+12 12.0
VSFAN 10.7
m
9 9
A
B
C
9 9
D
E
F
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