I have a Harman /
The most common problem found on FixYa for Audio Video Receiver's is:
receiver say's "Protect" or turns on then off. What's wrong? Seven
times out of ten it is a shorted speaker or speaker wire. To determine
your exact problem, the first
step is to disconnect all speaker wires "at your receiver" Next: Turn
the receiver back on. If your receiver still says "protect" or turns
off, it needs to be serviced. If your receiver stays on; reconnect your
speakers one at a time and power back up after each speaker. You may
find that after reconnecting all speaker wires it works! Most commonly
the small braids of wire from the + to the - have touched and have
caused the problem. In some instances, you noticed the problem only when
turning the volume up. either way, make sure the exposed wires to your
receiver are no longer than 1/2" long and are completely
under the screw down terminal or slide in. When you've found the wire
or speaker with the problem, your receiver will go back into "protect"
At this point, disconnect the wire from the speaker at the speaker that
may be causing the problem then test again.* Note* Make sure speaker
wires do Not touch each other as this Will cause a short! If you turn
the receiver back on and it stays on, you now
know the problem is in your speaker itself. To test your speaker, you
will need a multimeter. Set it to ohms resistance and touch the speaker
terminals, if there is a short internally the meter will read "1......"
If it's an analog meter, it will peg to the right. There's your problem.
Now, within any speaker there are quite a few possibilities as to what
could be causing the problem. Most common is a blown coil and the
speaker needs to be replaced. Some speakers have internal crossovers
(usually floor standing speakers) and may have a shorted or burnt board
(usually very visible brown burn marks on the board) and can possibly be
repaired if your handy with a soldering iron. Now, if you disconnect
the speaker wire at the speaker and it still says "protect" Check your
wire for the obvious cut or nail thru the wire if possible.
If your system has wiring that runs behind walls, you may need to use
your meter again. Disconnect the wire at both ends, keep the ends
separated, put your meter on ohms resistance and touch probes to the +
and - wires at one side. If the meter pegs to the right or reads "1...."
the wire is shorted and needs to be replaced or repaired at the short.
Hope this helps.
Harman Kardon HK...
on Jan 16, 2011