If pushing the power button does nothing, the unit is probably in "protect mode". This means there is an internal problem and will require professional service.
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It sounds as though a remote control button is stuck or perhaps one of the remote control sensors within the unit itself. I would imagine this piece of equipment to be well worth repairing and likely the most cost effective avenue as well.
Starting with it turned it off, press and hold the PWR button for some 4 seconds, until its indicator light is steadily lit. It is in pairing mode now. Then, bring your phone next to it, and make its bluetooth application search for new devices. After a little while, the HBM-760 should appear on-screen. Select it and make it connect. If a pairing code (or PIN, or passkey) is requested, enter '0000' (four zeros). If the pairing process is successful, your headset should enter the stand-by mode. Anyway, if its user guide happens to be missing, feel free to download it from this location. Hope you are able to sort your problems out soon. Anyway, please, let me know if I can help you any further. Regards, Carlos
This is not likely a power supply problem, but is isolated before the pre-amp stage. This can be a defective IC in the preamp stage as well.
Adcom schematics are not generally available, but you may be able to isolate the problem with a little experimentation. Try to run a signal through to see if you can get the signal as well.
I have had this problem in the Field with a Client.
I had fixed it by going into the ADCOM menu and Resetting ALL of the Inputs and output for the Devices.
You have to select everything you need, then exit out of the Menu, SHUT OFF the ADCOM, WAIT about 10 secs, then turn it back on.
Or Else it Does Not SAVE Properly! Weird.
If you can not see the Menu on the TV Screen then try to hook up a Composite (Yellow) cable from the ADCOM to the TV and select the TV input to make the Changes.
I really hope this helps out it sounds like an Evasive problem which is hard not being in front of the Equipment!
power on , but nothing come off,
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