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APPENDIX B: BASIC TROUBLESHOOTING
This section includes some basic troubleshooting sugges-
tions for configuring your Meyer Sound loudspeaker.
The On/Temp LED is not lit and there is no loudspeaker
output.
Make sure the AC power cable is the correct type for the
■
region's voltage and that it is securely connected to the
loudspeaker's AC inlet. Unplug the other end of the AC
cable and then plug it back in.
Use an AC voltmeter to verify that the AC voltage is
■
within 90–264 V AC.
■
Contact Meyer Sound Technical Support.
The On/Temp LED is green but there is no loudspeaker
output.
Verify that the audio source (mixer, EQ, delay) is sending
■
a valid signal. If possible, monitor the audio source with
headphones.
■
Make sure the XLR source cable is securely connected
to the loudspeaker's XLR Input connector.
■
Verify that the XLR source cable is functioning by substi-
tuting another cable or by using the cable in question in a
working system.
■
Connect the audio source to another loudspeaker to ver-
ify the signal is within the proper range. Turn the source
level down before reconnecting the audio source and
increase the level slowly to avoid a sudden blast of
sound.
Hum or noise is produced by the loudspeaker.
■
Disconnect the XLR source cable. If the noise goes
away, there is a problem somewhere in the audio
source's signal path. If the noise persists, there is a prob-
lem with the loudspeaker (return the unit to the factory or
the nearest authorized service center).
■
Make sure the XLR source cable is securely connected
to the loudspeaker's XLR Input connector.
Connect the audio source to another loudspeaker to ver-
■
ify the signal and that it is within the proper range. Turn
the source level down before reconnecting the audio
source and increase the level slowly to avoid a sudden
blast of sound.
Hum or noise can be produced by a ground loop. Since
■
the UPJunior is effectively ground-lifted, the loop may be
broken elsewhere in the system.
The loudspeaker output is distorted or compressed but
the Limit LED is not lit.
■
Make sure the XLR source cable is securely connected
to the loudspeaker's XLR Input connector.
■
Connect the audio source to another loudspeaker to ver-
ify the signal is within the proper range. Turn the source
level down before reconnecting the audio source and
increase the level slowly to avoid a sudden blast of
sound.
■
If possible, monitor the audio source with headphones.
The loudspeaker output is highly compressed and the
Limit LEDs are yellow.
■
Turn down the level of the audio source connected to the
loudspeaker.
The On/Temp LED is red.
This occurs when the heatsink temperature reaches 75°C
(185°F) and indicates that the amplifier is thermally over-
loaded.
■
Turn down the level of the audio source connected to the
loudspeaker.
■
Make sure the amplifier's fan is working properly.
■
Make sure there is sufficient air flow around the loud-
speaker.
Avoid exposing the heatsink to direct sunlight if the
■
ambient temperature is high.
See Chapter 3, "Amplification and Audio" for details about
amplifier limiting and the amplifier cooling system.
Only the high- or low-frequency drivers are outputting
sound.
■
Make sure the audio source is full-range and has not
been filtered at an earlier stage in the signal chain. If pos-
sible, monitor the audio source with headphones.
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