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Hi all,
I've got a pair of 50W (low, I know) active floor monitors from the 80s. One on them works fine, the other doesn't.
On the non-working one, when I inject the signal directly to the power amp, it comes through loud and clear.
My question is this:
is it a valid troubleshooting method, as opposed to injecting signal to the input and tracing it until it disappears, to inject the signal going from power amp input to signal input while listening at which point it stops reproducing sound?
I've traced the problem to the LM831N chip in the preamp (or rather the circuitry around it); works fine when I input the signal to the output leg, but inputting it to input legs I get very low sound coming out of the speaker.
Sorry, no schematics, these things were made in Yugoslavia in the 80s by Rudi Cajavec factory so virtually no data exists. It came stock with sweet coaxial RCF drivers so I'm reluctant to throw it away.
I'll upload some pics when I open them again.
I've got a pair of 50W (low, I know) active floor monitors from the 80s. One on them works fine, the other doesn't.
On the non-working one, when I inject the signal directly to the power amp, it comes through loud and clear.
My question is this:
is it a valid troubleshooting method, as opposed to injecting signal to the input and tracing it until it disappears, to inject the signal going from power amp input to signal input while listening at which point it stops reproducing sound?
I've traced the problem to the LM831N chip in the preamp (or rather the circuitry around it); works fine when I input the signal to the output leg, but inputting it to input legs I get very low sound coming out of the speaker.
Sorry, no schematics, these things were made in Yugoslavia in the 80s by Rudi Cajavec factory so virtually no data exists. It came stock with sweet coaxial RCF drivers so I'm reluctant to throw it away.
I'll upload some pics when I open them again.