Positioning The Housed Amplifier; Troubleshooting - Inter-m QD-4240 Operating Manual

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POSITIONING THE HOUSED AMPLIFIER

Place the case so that the ventilation airflow paths are not blocked.
Front
NO

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.
Indicator
CLIP indicator
lights.
PROTECTION
indicator lights.
Front
Probable Cause
There is a short at a
speaker terminal,
amplifier terminal, or
wire.
The amplifier load is
excessive.
The heat sink
temperature has
exceeded 100˚C.
DC voltage of +/–2V
or greater was generated
in the power amplifier's
output circuit.
Less than 10 cm
NO
Remedy
Locate and correct the
cause of the short.
Use a speaker system
with an impedance of at
least 4Ω (stereo) or 8Ω
(bridge).
Check the amplifier
ventilation conditions
and take appropriate
measures to improve
airflow around the
amplifier.
Consult your dealer.
Protection Circuit
The PC limiter circuit
operates to protect the
power transistors.
Same as above.
The thermal protection
circuit operates to
protect the power
transistors.
The relay operates to
protect the speaker
system.