Testing & Troubleshooting
Vol Limit
Test:
Manually select an Aux or Mic input. Press and hold the right arrow
button until the display stops incrementing.
Result:
The display stops incrementing at the volume limit for the particular
input and amp combination (see page 30). Turn the Promatrix power off
and then on to return volume levels to their initial preset levels.
Troubleshooting
Display shows COM ERROR or a series of 0, +, X
• Unplug the unit, wait 5 seconds then restore power.
• Display communication problem. Look for bent, broken or dirty pins on
display panel rear connector.
• Display cable broken or bent or dirty contacts in jacks.
False triggering of non-active higher priority inputs
• Aux signal is overloading the input (see above).
• Overloaded amplifier outputs. Check that the correct output tap is
used. Recheck speaker power settings and connections.
No output from an amp (PM-3180 Only)
• Assuming that power is on, volume is turned up and input is active —
check that the shorting clip across LINK on the amplifier output termi-
nal strip is in place (except 4-ohm operation).
• Check that the shorting clip is in place between COM and GND and
that the speaker load returns to one of these. If the shorting clip is
removed, make sure the speaker load returns to the correct terminal
(see page 14).
• Check that the internal audio processing links are set to IN (see page
34).
Pop when microphone is turned on
• If the microphone is not a condenser type, be sure that phantom power
is turned off for that input.
• Some pop noise can be caused by the mechanical switching of the
mic’s on/off switch.
Mic always active
• Microphone input precedence set to N.C. (see page 26).
• Hum and noise on mic line. Check mic wiring.
• Mic manually selected (see page 9).
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