I was wondering if anyone knew a cheap way to fix a HK AVR 247. I got one today from a customer who said he didn't know how to use it and that it worked fine. Brought it home, runs for about 15 seconds then comes up with "Protect" and then shuts off. Looks like it is over heating. If I leave it off for a while it will work for a minute then shut off. After it goes into protect mode it will turn on and immediately turn off.