Arp Solus - square wave at TP11, but no sound from outputs

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Tmatos75
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Arp Solus - square wave at TP11, but no sound from outputs

Post by Tmatos75 » Wed Apr 29, 2020 4:16 am

Help.
I am trying to repair an Arp Solus. I can see a square wave (with an oscilloscope) and hear it if I touch TP11 with a probe, but there is no sound at the output jacks.
After studying the schematics, I replaced Z20 (4558N) and Z21 (CA3086), thinking one of those two chips was the culprit and it would solve the problem, but it didnt.
Any ideas what could be preventing the synth from producing sound at the output jacks?
thanks in advance.

Tony

synthchaser
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Re: Arp Solus - square wave at TP11, but no sound from outputs

Post by synthchaser » Fri May 01, 2020 10:14 pm

If you have an oscilloscope, and have the schematics, just follow the signal towards the output until you lose it.

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