Question about Amplifiers & Preamps
Hi. Thanks for looking at my question. I have a KC-206 preamp which won't work. It lights up and the front controls appear to work but the digital volume indicated flashes 3 or 4 times when the unit is turned on then freezes at 4 on the volume scale. I got this along with a kenwood amp on ebay (I only needed the amp) and would hate to throw it away. I've seen on the internet where this might be a problem with the remote control (which I don't have). I haven't hooked the unit up to a power amp yet but assume this wouldn't change the problem. Turning the volume control knob does not alter the frozen volume position. Any help would be appreciated. Thanks. Ken I am having the same problem as you are here. I too purchased this unit as a whole system. But the remote sensor reading on the unit showed only at 4 like your. But I was able to hook the unit up and get low volume playing level from the power amp with the volume control turned all the way up. Using the equalizer control I was able to get additional volume out of the main amp. I hope someone can help us here.
I was able to use an universal remote control that I have, a Radio Shack Kameleon 6 in one remote control which I was able to program to run the audio portion of the Kenwood KC 206 control preamp. By adjust the remote sensor volume to max, I was able to get maximum volume out of the unit and drive the power section very nicely. Now I have to get up and manually turn the manual volume control for addition volume adjustment.
Hopefully Ken can find a remote that he can control the Kenwood control preamp the same way I did. Good luck here.
Posted on Dec 02, 2008
I found this thread when I was having the same problem with mine. Turns out that it's sort of a problem, but not really. Looking at the manual (which I found in another google search) I believe a "4" on the volume level corresponds to a default remote control setting. The remote varies the level between 0 and 10, but the "10" corresponds to the maximum volume setting on the preamp. So it actually works, it's just that the "4" reading doesn't change. There's probably a pin you can short somewhere to make that default to "10" which would be ideal. But I'm not sure where that is. Now on to my other problem. This particular preamp has a subtle 120 Hz hum...
Posted on Dec 02, 2009
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Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
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