Yamaha P2500S, Руководство пользователя

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15
Troubleshooting
The following table lists the main causes of abnormal operation and the corrective measures required, as well as the protective circuit opera-
tion in each case.
P3500S, P2500S
P7000S, P5000S
Indicator(s) Possible Cause Remedy Protection Circuit
CLIP indicator lights.
There is a short at a speaker
terminal, amplifier terminal, or
wire.
Locate and correct the cause of
the short.
The PC limiter circuit operates
to protect the power
transistors.
The amplifier load is excessive.
Use a speaker system with an
impedance of at least 4
Ω
(STEREO/PARALLEL mode) or
8
Ω
(BRIDGE mode).
TEMP indicator lights.
The heat sink temperature has
exceeded 85˚C (185˚F).
Check the ventilation slots, and
provide better airflow around
the amplifier. The TEMP indicator lights up
to indicate temperature
warning.
PROTECTION indicator lights.
The heat sink temperature has
exceeded 95˚C (203˚F).
Check the amplifier ventilation
conditions and take appropriate
measures to improve the
airflow around the amplifier.
The thermal protection circuit
operates to protect the power
transistors.
Indicator(s) Possible Cause Remedy Protection Circuit
PROTECTION indicator lights.
A DC voltage of ±2 V or greater
was generated in the power
amplifier’s output circuit.
Consult your dealer or the
nearest Yamaha service center. The relay operates to protect
the speaker system.
Indicator(s) Possible Cause Remedy Protection Circuit
Power has been shut down. (All indicators
are off.)
A DC voltage of ± 2 V or greater
was generated in the power
amplifier’s output circuit.
Consult your dealer or the
nearest Yamaha service center.
The protection circuitry shut off
the power to protect the
speaker system.