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If you don't have a multimeter, you can still test the power supply by plugging it into another 12 volt DC device with the same polarity (tip positive). The power supply is a possible but not the most likely source of your problem. I have recently had to send my HEQ5Pro handset back to be replaced under warranty because of an almost identical problem. And I know of at least one other HEQ5Pro owner who has had a similar problem in the past couple of months.
Take the handset to your dealer and have him test it.
Peter
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