Audio Systems: Problem with a Kenwood KAC-929 amp, kenwood kac 929, audio power amps

Question
Hi there.  The problem with this amp (Kenwood Kac-929) is when it receives power, the power light on the outside seems to to flash/blink.  It doesn't do it in a pattern or anything, just a constant quick flash.  Kind of hard to explain.  I thought the power light is usually solid.  And there was no power to the speakers, but there was power to the amp.  I hope I am making sense.  I have the "real" manual for this amp.  The one with the wiring schematics, block diagram, etc.  I would be more than happy to send a copy if it would help in determining the problem.  It's in .PDF format.  Any thoughts, suggestions or ideas would be greatly appreciated.  Also, in a situation like this or any others, how could I go about testing the components of the amp to find which part or parts are bad??  Does the amp need to have power in order to do this??  I really appreciate your time in reading this and hopefully responding with some helpful information.  My email address is Kane817@Gmail.com.  Thanks a lot!!!


Mike

Answer
The flashing of the standby lamp is a sign the amp has gone into cardiac arrest (a protection mode caused by too much current being drawn from somewhere in the set) and is designed to avoid further damage to the set.

Do a hard reset by unplugging the power cord for at least 30 minutes - if you haven't already done this - to see if that will restore power.  Sometimes these big audio power amps are designed to detect momentary shorts across the speaker outputs and such and will not come back on until it is corrected.

If the reset does not bring it back to life, disconnect the speaker wires at the back of the amp and try again. If the light comes on continuously it means there was probably a shorted condition in one of the speaker wires or a speaker itself.  

With speakers disconnected and it seems alright, connect only one speaker at a time and see what happens.  

If you are sure the unit is having trouble internally then you may have to replace the output transistors.

If you want more advice, please send this correspondence completely and the pdf manual to me and I will give you further instructions on how to test it.  

cleggsan @ ieee.org   (fill in the spaces before and after the @ - this is to keep spammers from picking up my email address.)