Troubleshooting - Electro-Voice PXM‑12MP Series Installation Manual

PXM-12MP Powered Monitor
6

Troubleshooting

Problem
1. No sound
2. Poor Low-
Frequency
Response
3. Intermittent output
such as cracking or
distortion
4. Constant noise
such as buzzing,
hissing or humming
5. No sound produced
with microphone
connected to INPUT
1 or INPUT 2
6. Sound is distorted
front LED is OFF,
LCD screen LIMIT is
ON
Electro-Voice
Possible Cause(s) Action
Amplifier Verify all the electronics are on, the signal routing is
correct, the source is active; the volume is turned up,
etc.
Correct/repair/replace as necessary. If there is still no
sound, then the problem may be wiring.
Wiring Verify you have connected the correct cables to the
amplifier. Play something at a low level through the
amplifier. Connect a test loudspeaker in parallel with the
malfunctioning line. If the sound level is gone or is very
weak, the line has a short in it (possibly a severe scrape,
pinch, or a missed connection). Using the test
loudspeaker, move down the line and test each
connection/junction until you find the problem and
correct it. Observe proper polarity.
With SUB menu If no subwoofers are used with the system, select the
cross-over frequency OFF position.
activated
Faulty connection Check all connections at amplifier and loudspeakers to
ensure they are all clean and tight. If the problem
persists, check the wiring. See problem 1.
Defective source or If noise is present, but no program material is playing,
other electronic evaluate each component as necessary to isolate the
device problem. Most likely there is a break in the signal path.
Poor system Check and correct the system grounding, as required.
grounding or ground
loop
Input gain knob is Slowly increase the input gain knob level to engage the
not in the MIC microphone pre-amp.
position
Microphone requires Switch PHANTOM 1 or PHANTOM 2 to ON in the menu.
phantom power. See DSP control menu, page 16.
Input gain knob is Slowly increase the input gain knob level to engage the
not in the MIC microphone pre-amp.
position
Excessive input level Reduce the input level or loudspeaker level knobs to
prevent limit.
Incorrect gain Verify level controls of the source are properly structured
structure or source by using the VU meter indicator on the LCD screen. If the
input (mixing VU meter bar is solid or the system indicates LIMIT, the
console/preamp) is input or source level is too high.
overdriven
Installation manual
Troubleshooting | en 23
2019-10 | v01 | F.01U.363.983