Troubleshooting - Yamaha P2500S Owner's Manual

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.
Indicator(s)
CLIP indicator lights.
TEMP indicator lights.
PROTECTION indicator lights.
P3500S, P2500S
Indicator(s)
PROTECTION indicator lights.
P7000S, P5000S
Indicator(s)
Power has been shut down. (All indicators
are off.)

Troubleshooting

Possible Cause
There is a short at a speaker
terminal, amplifier terminal, or
wire.
The amplifier load is excessive.
The heat sink temperature has
exceeded 85˚C (185˚F).
The heat sink temperature has
exceeded 95˚C (203˚F).
Possible Cause
A DC voltage of ±2 V or greater
was generated in the power
amplifier's output circuit.
Possible Cause
A DC voltage of ± 2 V or greater
was generated in the power
amplifier's output circuit.
Remedy
Locate and correct the cause of
the short.
Use a speaker system with an
impedance of at least 4 Ω
(STEREO/PARALLEL mode) or
8 Ω (BRIDGE mode).
Check the ventilation slots, and
provide better airflow around
the amplifier.
Check the amplifier ventilation
conditions and take appropriate
measures to improve the
airflow around the amplifier.
Remedy
Consult your dealer or the
nearest Yamaha service center.
Remedy
Consult your dealer or the
nearest Yamaha service center.
Protection Circuit
The PC limiter circuit operates
to protect the power
transistors.
The TEMP indicator lights up
to indicate temperature
warning.
The thermal protection circuit
operates to protect the power
transistors.
Protection Circuit
The relay operates to protect
the speaker system.
Protection Circuit
The protection circuitry shut off
the power to protect the
speaker system.
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