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In Reply to: Re: H/K 430 not working - need help posted by hc122 on March 1, 2007 at 15:01:37:
It's definitely not normal hum. It's more like very low frequency thumping that causes the woofer to bottom out. If I so much as touch a knob on the front panel, there's extremely loud scratching for several seconds and the woofer really goes crazy. I'm afraid to hook the speakers back up to it for fear of frying them.
Follow Ups:
a failing or bad driver or output transistor (or transistors).If the former, it could be related to cables or possibly even speakers.
If the latter, professional help is indicated.
N.B. The symptom you describe is NOT GOOD for your speakers. There may well be some significant DC getting to them. You can check with a DMM or VOM if you happen to have one.
One possibility for troubleshooting. IIRC, the 430 has pre out/main in jacks, no? If so, you can assess the function of the preamp and power amp separately.
Right on. I just checked with a DMM and I've got a fair bit of DC coming out of the one channel. The others seem okay. It figures the one channel I connected to test would be bad. If it's just a bad transistor I could replace that easily enough. Much thanks for the help. I'll post again if I encounter any other problems.
nt
all the best,
mrh
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