I’m trying to do a good deed and help someone with this piano. It was given to me powering up but making no sound. I found 2 capacitors that seemed to be leaking (C122 and C408.) I replaced them but unfortunately the FFCs separated from the reinforcement and got a bit mangled. So I tried fixing them, but now I get no power at all - no LED when I push the button.
I‘d like to figure out how to diagnose this thing to figure out if it’s the cable and/or something else. I could just buy new cables from Mouser but I’m on an island and would prefer to just place one parts order if possible.
I‘m new at troubleshooting circuits, but I have built several guitar pedal kits and a few tube headphone amp kits. Fortunately or unfortunately the all worked right from completion so I didn’t get to troubleshoot much.
Some questions:
What does +5A and +5D mean? Is that AC and DC voltage?
what can I probe to verify power is making it to the switch and back?
schematics are in the manual with block diagrams, here:
https://www.synthxl.com/wp-content/uploads/2020/02/Yamaha-P-85-85s-service-manual.pdf
Thank you SO MUCH for any guidance!
I‘d like to figure out how to diagnose this thing to figure out if it’s the cable and/or something else. I could just buy new cables from Mouser but I’m on an island and would prefer to just place one parts order if possible.
I‘m new at troubleshooting circuits, but I have built several guitar pedal kits and a few tube headphone amp kits. Fortunately or unfortunately the all worked right from completion so I didn’t get to troubleshoot much.
Some questions:
What does +5A and +5D mean? Is that AC and DC voltage?
what can I probe to verify power is making it to the switch and back?
schematics are in the manual with block diagrams, here:
https://www.synthxl.com/wp-content/uploads/2020/02/Yamaha-P-85-85s-service-manual.pdf
Thank you SO MUCH for any guidance!
