Troubleshooting - JBL PRX515 User Manual

TROUBLESHOOTING

Symptom
No sound.
No sound, speaker is connected
to working AC power but won't
come on.
No sound, speaker comes on.
No sound with microphone
connected directly to the MIC input.
Signal Sounds distorted and very
loud, OVERLOAD light is lit most of
the time.
Signal sounds distorted even at
moderate volumes, OVERLOAD
light is not lit.
26
Likely Cause
Speaker not connected to
active AC power.
Speaker power Cable is faulty
or improperly Connected.
Blown fuse.
Signal source (mixer,
instrument, etc.) is
not sending.
Faulty cables and connections • Check VU meters on the source mixer
Faulty cables and connections • Disconnect and re-seat signal cables.
Microphone requires
phantom power
Excessive input signal, trying
to exceed the capabilities of
the speakers
Mixer or other source
is overdriven
What to do
Verify that speaker is connected
and that the circuit is on. Switch on
power and verify that illuminated logo is on.
• Re-seat the power cable at both ends.
• Substitute a known-good power cable.
• Replace the fuse with the specified value.
• Take your speaker to a competent servicer.
• Verify that the CD/MP3 is playing.
• Use headphones to verify that the
instrument is actually sending an audio signal
• Replace suspected cable with a
known-good cable
The PRX500 speakers do not supply phantom
power, Switch to a dynamic microphone, use a
battery in the microphone (if possible), use and
external phantom power supply.
• Reduce the output level of the source.
• Turn down the level controls on the speaker.
Review the Owner's Manual for your system
setup and adjust controls as needed.
• Input sensitivity (gain)