Yamaha XP7000, Руководство пользователя

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XP7000/XP5000/XP3500/XP2500/XP1000 Owner’s Manual
Troubleshooting
The following table lists the main causes of abnormal operation and the corrective measures required as well as the protec-
tive circuit operation in each case.
●
XP3500, XP2500
●
XP7000, XP5000
Indicator(s) Possible Cause Remedy Protection Circuit
CLIP indicator lights.
There is a short at a speaker ter-
minal, 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
(STE-
REO/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 tem-
perature warning.
PROTECTION indica-
tor lights. The heat sink temperature has
exceeded 90°C (194°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 indica-
tor lights.
A DC voltage of +2 V/-2 V or
greater was generated in the
power amplifier’s output circuit.
Consult your dealer or the near-
est Yamaha service center.
The relay operates to
protect the speaker sys-
tem.
Indicator(s) Possible Cause Remedy Protection Circuit
Power has been shut
down. (All indicators
are off.) A DC voltage of +2 V/-2 V or
greater was generated in the
power amplifier’s output circuit.
Consult your dealer or the near-
est Yamaha service center.
The protection circuitry
shut off the power to pro-
tect the speaker system.