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Clarion apa 4400g output issue
I repaired the power supply section, it had a broken trace at the remote terminal, and voila, 3 of the 4 channels sprang to life. But… The channel 3,. That one, decided not to spring back to life.
Signal goes from the input to the op amp boards that have the gain and filters, and mono stereo selector. From there I can follow the signal around to the last op amp on the main board, and them to the output section. I can trace both left and right signals to the stk350 voltage Amplifier, but channel 3 doesn’t get there. Just before going into pin 14, it gets all messed up at the resistor marked with an arrow. Color bands indicated a 520 ohm 5% tolerance resistor. It’s resistance was off, read 870ohm or so. So I pulled it. And I replaced it with a 475 and 33ohm resistor in series. The signal is distorting and not coming out of the replacement resistor. Why would the signal get stuck there
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