12
Troubleshooting
The following table lists the main causes of abnormal operation and the corrective measures required as well as the
protective circuit operation in each case.
Protection CircuitRemedyPossible CauseIndicator
CLIP indicator lights up
PROTECTION indicator
lights up
There is a short at the
amplifier’s speaker
outputs, the speaker’s
inputs, or in the wiring.
The impedance of the
connected speaker
is too low.
The heat sink temperature
has exceeded 90°C.
A DC voltage of ±2 V
or greater was detected
in the amplifier’s output
circuit.
Locate and remove
the short.
Check the ventilation
around the amplifier
and improve the airflow
if necessary.
Consult your dealer
or a Yamaha service
center.
The PC limiter circuit
activates to protect
the power transistors.
The thermal protection
circuit activates to
protect the power
transistors.
The output relay activates
to protect the speaker
system.
Use a speaker with a
minimum impedance
of 4Ω (8Ω in Bridge
mode).