Question about B&K AVR-307 Receiver
Hello, My B&K receiver just started making a very loud buzzing noise. The noise eminates from the unit itself. I have tried unplugging all the various components I had hooked up and tried unplugging the unit from my Monster surge protector box and plugging directly into the wall. Still has the problem. Any help would be much appreciated! Thanks Brad
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Posted on Jan 02, 2017
SOURCE: Protector flashing
Protet mode is a special diagnostic mode that starts when a fault is detected.
When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.
Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.
Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.
If you do all the above and still get Protect, then there is a real fault.
In that case the unit may be disassembled and tested to find the fault.
If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.
Posted on May 29, 2009
If you are still covered by the warrenty, then you may be able to get it fixed at no cost.
Otherwise get a qualified technician (I say this to cover my but rather than suggesting that you open it up yourself) to open it up and check the fuses inside.
Posted on Aug 17, 2009
Either some shielding baffles are loose and are vibrating or the transformer itself is generating too much sound . This happens when the power extracted thru it exceeds its capacity - there's a fault/short somewhere in the electronics. You will gonna have to open it and check for the fault.
Posted on May 29, 2010
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