Conditions For Switching The Rotation Speed Of The Fan - Pioneer SX-SW77 Service Manual

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7.1.6 CONDITIONS FOR SWITCHING THE ROTATION SPEED OF THE FAN

A fan is provided with this unit. Its rotation speed can be switched between low and high under the following conditions.
1. Conditions for switching the rotation speed from low to high
In a case where an audio signal is input and the main volume becomes VOL 20 or more
• The rotation speed is not switched to high immediately after the main volume becomes VOL 20 but with a delay of 30 seconds.
• If a digital stream signal is not input, the rotation speed is not switched to high even if the main volume becomes VOL 20 or more.
• If the function is ANALOG IN, even if there is no audio signal input, 30 seconds after the main volume becomes VOL 20 or more,
the rotation speed is switched to high.
2. Conditions for switching the rotation speed from high to low
• If the main volume becomes less than VOL 20
• During muting
• If a digital stream signal is not input
Note: The rotation speed is immediately switched to low when one of the above conditions is met.
3. Fan drive circuit and drive voltage
The fan drive circuit and the drive voltages at low/high rotation speed are shown below:
VSF+12
+
5
6
VSFAN
Circuit for switching the
drive voltage between 7 V
and 12 V
7-V drive circuit
6
7
Low speed, no digital stream signal
(except when the function setting is
ANALOG IN)
Low speed, with audio input,
with VOL 19 or less
High speed, with VOL 20 or more
Note: The above voltage values are references.
They differ from product to product.
SX-SW77
7
8
A
B
C
Power Voltage (V)
VSF+12 12.3
VSFAN 6.7
VSF+12 13.1
VSFAN 7.4
VSF+12 13.0
VSFAN 12.2
D
E
F
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