Troubleshooting - Pyle Hydra PLMR440PA Owner's Manual

Troubleshooting
Before removing your amplifier, refer to the list below and follow the
suggested procedures. Always test the speakers and their wires first.
Amplifier will not power up.
Check for good ground connection.
Check that remote DC terminal has at least 13.8v DC.
Check that there is battery power on the +terminal.
Check all fuses.
Check that Protection LED is not lit, If it is lit, shut off amplifier briefly
and then repower it.
High hiss or engine noise (alternator whine)in speakers.
Disconnect all RCA inputs to amplifier(s)-if hiss I noise
disappears, then plug in the component driving the amplifier
and unplug its inputs. If hiss I noise disappears, go on until
the faulty
I
noisy component is found.
It is best to set the amplifier's input level as insensitive as
possible. The best subjective
SIN
ratio is obtainable this way.
Try to drive as high a signal level from the head unit as possible.
Protection led comes on when the AMPLIFIER is powered up.
Check for shorts on speaker leads.
Check that the volume control on the head unit is turned down low.
Remove speaker leads, and reset the amplifier. If the Protection
LED still comes on, then the amplifier is faulty.
Amplifier (8) gets very hot.
Check that the minimum speaker impedance for that model is correct.
Check for speaker shorts.
Check that there is good airflow around the amplifier. In some
applications, an external cooling fan may be required.
Distorted sound
Check that the Level control(s) is set to match the signal level of the head unit.
Check that all crossover frequencies have been properly set.
Check for shorts on the speaker leads.
High squeal noise from speakers
This is always caused by a poorly-grounded RCA patch cord.
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