It's a Kenwood Basic M2 (and possibly a Kenwood Basic C2 preamplifier). I bought it on eBay and the guy was a liar; the listing said the item worked fine. It crackles, hisses, and the left channel doesn't work at half of the volume settings (it has a left and right channel volume control built in). It's supposed to put out 220 watts per channel into 8 ohms, but it can hardly put out 40 before it starts having problems. Up to about 40 watts it sounds absolutely terrible, the highs are very harsh and there is no bass.
eBay has "penalized his account" which doesn't help the fact that I'm still down $200 for essentially a giant paperweight. I'm trying to get money from the guy for the repair since he lied to me. I just need to know where to repair.
You have bought yourself a bit of a problem. That is a class G switching amp. Apparently it uses oddball Sanken dual transistor output devices. There are two rails at 56 volts and 91 volts. At lower power the devices connected to the low voltage rail conduct and at high power the high voltage devices conduct.
Apparently there is an elaborate switching IC circuit using a TA2031 IC.
This is an unusual circuit and unique to a couple of Kenwood amps.
Minneapolis is not well off for good service techs. The best I know is the guy at Hi Fi Sound. I don't know if he will go near that one though. You would never sort this out without a service manual. You can download a service manual here.
http://www.hifimanuals.com/proddetail.php?prod=1605
You might have to send this oddball to a Kenwood Service center. They are in CA, VA and NJ.
If you want to come up to Benedict after Downloading the manual you are welcome. We can see if we can make sense of it. I bet one of the rails is down or the switching circuit is out.
I have a place in Eagan now also, but I won't be there until the beginning of next month, and I have no test gear there.
