Question about Shure PSM 400 Professional Microphone

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My shure psm 400 receiver cuts out. If I disconnect the antenna it comes back. If I turn it off and back on I get no audio until I disconnect the antenna again. Mine cuts out and then comes back on after I unplug & replug the power cord

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I would suggest sending it in to the Shure Service Department for repairs. Information is at

Posted on Jul 15, 2010


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The receiver unit works fine but sudenly goes mute and comes back on between 3 and 40 minutes later. Its not an ear phone problem.

It might be over heating? do you have the right ohm speakers hooked up should use 8 ohm speakers as lower ohm speakers will cause this problem!

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bring in your guitar and have the intonation checked on pickups

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I have a Shure PSM 900 and for some reason I suffer from extreme dropouts. I have checked everything I could, batteries, limit switch settings (tried all of them), adjustments on the receiver/bodypack. ...

This system operates in the 600 MHz band. Things to consider: Never use rechargeable batteries in things designed for alkaline. Transmitter should be within 100 feet for reliable link. Interference from other sources will OVERIDE the low power signals for this unit. Such sources can for instance be the fourth harmonic of polce and taxicab radios... fifth harmonic of aircraft radios... other RF sources including computers. All of these devices are SECONDARY users that MUST tolerate interference from licensed primary users of the band. The devices are FM radio links and with FM a transmitter anywhere near the same frequency will "CAPTURE" the discriminator of the unit and you MAY not even hear the audio of the interfering transmitter/source because it may use a different modulation means, if it is even modulated. Just changing to a different channel is NOT likely to fix the problem long term either. Shure makes high quality devices and I doubt the device is defective... only interfered with or being used at too long a range. Use an unused wire in the snake if you use one to get the transmitter within 20 feet of you and it might fix the problem. This unit is NOT a diversity device as in ear monitors are really not diversity (with two antennas and receivers) like ones used to send the other direction often are.

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1 Answer

How do you turn off the demo on the jvc car radio

Hello gusjandreau,

Press and hold the SEL button until the receiver enters the PSM mode (until the display changes). Use the left/right rocker switch until the display reads DEMO. Turn the volume knob until display reads DEMO OFF. Briefly press SEL to exit PSM mode.

Hope this helps.

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1 Answer

My psm 400 receiver lights up red and wont work...

A red screen indicates a dead battery. Try a new battery. If that doesn't resolve the issue, then it will need to be sent to Shure for repairs.

Jun 25, 2009 | Shure PSM 400 Professional Microphone

1 Answer

Shure PSM400 In ear monitoring


It could be a problem with your antenna.
Or maybe your transmitter is build in a aluminium flightcase which is holding off your RF signal.


Sep 26, 2008 | Shure PSM 400 Professional Microphone

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