Alpine R-A75M Owner's Manual page 12

About Power Indicator
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Power Indicator
Lights up when power is on.
Is off when power is off.
Indication color
Status
Blue Amplifier circuit is normal.
Red Operating temperature is
(blinking) high.
Red Amplifier circuit is abnormal.
An electrical short has
occurred, or supply current is
too high.
Operating temperature is too
high.
Power supply voltage is too
high.
Solution
Turn down the volume of the head unit (input
signal).
Decrease the vehicle's interior temperature to a
normal level.
The indicator color changes to blue.
Turn off the power supply and eliminate the cause.
Then turn on the unit and verify that the indicator
color has changed to blue.
If it remains red, turn off the unit and consult your
dealer.
Decrease the vehicle's interior temperature to a
normal level.
The indicator color changes to blue.
Use the correct power supply voltage.
The indicator color changes to blue.
11 -EN