I have a Kac7005PS that has quit working. Fuses and everything are good and my connections are solid. I see no visible burn marks or any components that show tell tale signs they are bad. Issue started out with my subwoofer output pulsing fast on one channel. I unhooked this and just used my front outputs. Eventually the fronts gave me trouble when I increased the volume fairly loud and the amp would go into protect mode. It will not give any output now. The light comes on and all the connections are good. I tried using only one speaker set and cannot get any of the channels to work. What should I check first?
Check your shield grounds on the head unit:
RCA Shield Repair
Also, measure the DC voltage on the RCA shields of your amplifiers. Place the black probe on the amp ground terminal and the red probe alternately on all RCA shields. You should not read any significant DC voltage. IF there is initially no DC voltage on the shields, tap/beat on the heatsink of the amp and watch for any spikes in voltage.
RCA Shield Repair
Also, measure the DC voltage on the RCA shields of your amplifiers. Place the black probe on the amp ground terminal and the red probe alternately on all RCA shields. You should not read any significant DC voltage. IF there is initially no DC voltage on the shields, tap/beat on the heatsink of the amp and watch for any spikes in voltage.
I already replaced the head unit and am using a new one with the same symptoms. I will go ahead and check the amp rca shields thank you for your reply.
Well I checked the amp ground shield and everything is fine there. I did notice today though when I hooked everything up on the side with the RCA inputs and adjustable pass ranges that the LED on that side does not light up. The main power LED on the front center of the case does though.
An externally hosted image should be here but it was not working when we last tested it.
Ok so I have found the cause of why this amplifier died. What I did to it was connected too many speakers causing too much draw. I had the front channels bridged but only powering two speakers, so we were good there. For the subwoofer part I had two dual voice coil 400w subs wired in. I have killed this amp and a Phoenix gold V754 this way. I cannot find any burnt components what do you think would burn up first and go bad?
Post a good quality photo of the circuit board in the amp.
If it's under warranty, return it for repair/replacement.
If it's under warranty, return it for repair/replacement.
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An externally hosted image should be here but it was not working when we last tested it.
It is not under warranty. I've done simple test this and solder that before. However I have not ripped into a amplifier before.
What is the DC voltage on all 3 legs of Q811?
Place the black probe on the ground terminal of the amplifier.
Place the black probe on the ground terminal of the amplifier.
Starting from the left 10.7 10.7 0, I shorted out what looked like a small black resistor while I was in there and unplugged my fan which had not been working and plugged it back in after checking voltage on the postive lead of it which read .8 volts and when I plugged it back in it started working with output to the sub channel. I will do more testing later when my wife gets home with my truck.
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