I have a macchiato that produces no sound and isn’t resolved by the above fixes.
So I finished soldering the macchiato, and although the power supply, power LED, speaker, and headphone output are all working, there’s no sound coming out of the machine when I play the keyboard. The volume dial is turned up, all the other dials are turned down, including the release, attack, and depth dials as suggested in
https://zeppelindesignlabs.com/forums/topic/synth-not-working-troubleshooting-help/
I can generate a noise output signal by bridging the audio circuits by touching the keyboard and the solder joints of the volume dial – though the first time I did this, holding the macchiato in my hands with my fingers touching the solder joints, I heard a high-pitched whine that died out within seconds.
I think what might have happened is a static electricity discharge damaging the ICs when I soldered them. I followed the advice to ground myself by touching my metal-cased amplifier while handling the IC components, but later felt a tingling when I touched my amp and then my laptop – I think my amplifier is badly grounded, and might have introduced a discharge voltage into the IC while I was touching both.
As far as I can tell, all the components are soldered into contact with the PCB, and nothing seems to be in the wrong place or in inappropriate contact. How can I test and diagnose the issue? Should I try to flash software onto the macchiato to identify or resolve the issue? Should I replace the IC components – purchased from ZDL or from a generic supplier?
I have a version 3.0 macchiato, serial number ZD2197
I’m in Berlin, where I purchased the macchiato from KOMA electronics – I’ll also take it to them and see what they think.