I have read a couple similar threads, but I have a different problem.
I have a kicker cxa 300/4 amp that blew up the power supply fets. I replaced the fets, the gate resistors, the polyester film caps, and the 494 ic on the power supply card.
The amp powers up and comes out of protection, but it has no output on the amp 2 side. The output transistors are good.
I have a kicker cxa 300/4 amp that blew up the power supply fets. I replaced the fets, the gate resistors, the polyester film caps, and the 494 ic on the power supply card.
The amp powers up and comes out of protection, but it has no output on the amp 2 side. The output transistors are good.
Amp 2's left channel, right channel or both channels?
Have you looked at the RCA inputs?
The signal path for amp 1 and amp 2 are split between the main board (amp 1?) and the larger daughter board connected through a header socket (Amp 2?).
There are four 2.2 ohm resistors that feed the +/-15 volts to the input op amps. Amp 2's op amps are feed by R193,R194. One or both of them may have opened up. If so, CP1 or CP11-100uf/25v may be shorted.
It's also possible there may be an interruption in signal trough the header socket.
Have you looked at the RCA inputs?
The signal path for amp 1 and amp 2 are split between the main board (amp 1?) and the larger daughter board connected through a header socket (Amp 2?).
There are four 2.2 ohm resistors that feed the +/-15 volts to the input op amps. Amp 2's op amps are feed by R193,R194. One or both of them may have opened up. If so, CP1 or CP11-100uf/25v may be shorted.
It's also possible there may be an interruption in signal trough the header socket.
Thank you for your help.
I broke out my scope and can follow a 1khz signal all the way to s5, the push button switch for hi or lo input level.
Oddly enough, the signal from amp 2's input will play out of amp 1's output if the input level is set to high. On low, no signal reaches the op amps on the daughter card.
R193, r194, cp1 and cp11 test good and I am getting +/- 15 volts on both opamps.
Could s5 be bad?
I broke out my scope and can follow a 1khz signal all the way to s5, the push button switch for hi or lo input level.
Oddly enough, the signal from amp 2's input will play out of amp 1's output if the input level is set to high. On low, no signal reaches the op amps on the daughter card.
R193, r194, cp1 and cp11 test good and I am getting +/- 15 volts on both opamps.
Could s5 be bad?
S5 is the fader switch. Apply signal to amp 1 with the fader switch out and follow the signal through amp 2's preamp. Starting with IC1 on the main board and through all 200 series IC's. You can also apply signal to amp 2 with the fader switch in.
I've seen cold solder joints around the IC's capacitors and resistors. Also, check continuity through the header socket.
I've seen cold solder joints around the IC's capacitors and resistors. Also, check continuity through the header socket.
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