Troubleshooting; System Setup - JBL PRX600 series User Manual

Symptom
No sound
No sound, speaker is connected
to working AC power but won't
come on
No sound, speaker turns 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
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 active
Faulty cables and connections • Check VU meters on the source mixer.
Faulty cables and connections • Disconnect and re-seat signal cables.
Microphone requires 48V
phantom power
Faulty microphone cable
Excessive input signal, trying
to exceed the capabilities of
the speakers
Mixer or other source
is overdriven (clipping)

TROUBLESHOOTING

What To Do
Verify that speaker is connected and that
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
and type.
• Take your speaker to a competent
service center.
• 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 PRX600 speakers do not supply
phantom power. Switch to a dynamic
microphone, use a battery in the microphone
(if possible), use an external phantom power
supply. Check cable.
• 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)
• Check gain structure of signal chain
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