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Sentry HW701 headphones won't turn on?

My transmitter seems to be on and working but when i try turn on the headphones, not only will the light not come on, but the headphones won't even work.

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5 Suggested Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: logitech wireless headphones

Trying re-syncing the transmitter and the headphones. Hold down the power buttons on both until they alternate red and blue blinking, worked for me and now they work just fine. Got that from the Logitech FAQ website.

Posted on Mar 19, 2008

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  • 1 Answer

SOURCE: Sentry HO900 headphones

The H0900 should come with a mini-plug adapter. The headphone jack in my TV was deeply inset, so I kinda reversed it. The adapter plugs into the transmitter, then the Red/White plugs, into that, then the long end of the cord into the TV.

Works fine for me. My problem will be posted seperately.

Posted on May 19, 2008

  • 1 Answer

SOURCE: Sennheiser Wireless Headphone Stops transmitting signal

I had the same problem when I plugged it into a new HDTV. The problem was that the sound on the TV was set too low. The transmitter has a feature that automatically turns off when the signal is off or too low. Try turning up the TV volume to a high/higher level and it should solve your problem. Using the headphone jack with the white input allows you to use the headphones while bypassing the TV speakers.

Posted on May 02, 2009

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SOURCE: My Sentry headset wont work, the model i'm not to

You have to pay for the solution..this is the worst rip off in all of time, selling you screwed up items and expecting us to pay to get them fixed. WHAT RIP OFF!

Posted on Aug 03, 2010

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I don't think the 12V power pack is the problem. Generally there would be a regulator on the plug pack input to the transmitter (as power packs are notoriously bad at voltage regulation).

My guess is it an 'earth leak' between the TV and the transmitter via the audio lead. Does the powerpack have a earth pin. If so, are you able to plug it into an non-earthed power outlet.

If this isn't possible try removing the ground connection from the audio lead.

It could also be a bad audio lead.

Is the TV mono and the transmitter stereo or visa versa? You may need a mono to stereo lead.

Hopefully something in here will help.



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Turning the transmitter on and off (Fig. 5)
Turn on the sound source. This automatically activates the
transmitter and the green LED “ON/OFF” lights up. If the sound
source is turned off, the transmitter is automatically deactivated
after approx. 3 minutes (the LED “ON/OFF” goes off).
Note: The automatic level control only functions if the volume of the
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The H0900 should come with a mini-plug adapter. The headphone jack in my TV was deeply inset, so I kinda reversed it. The adapter plugs into the transmitter, then the Red/White plugs, into that, then the long end of the cord into the TV.

Works fine for me. My problem will be posted seperately.

Mar 09, 2008 | Sentry HO900 Headphones

2 Answers

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Trying re-syncing the transmitter and the headphones. Hold down the power buttons on both until they alternate red and blue blinking, worked for me and now they work just fine. Got that from the Logitech FAQ website.

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