Heyo,
So first off I'm a new user to this forum as well as inexperienced with electronics and I wanted to share a project that I'm taking on with a group of nerds that might be able to give me useful feedback from time to time, hopefully some of you might find this interesting too. I own an older Technics digital organ, specifically the EX35 which was built in the early 90s. At some point over the last several years the organ became inaudible unless you pressed your ear closely to the speaker. So presumably something had died on the amplifier circuit, unfortunately just fixing whichever component was broken on this board is no longer really plausible.

The Amp circuit board shares a PCB with the power supply for the organ and when I took the circuit board out for repair I managed to drop the PCB and break sizable chunk off, breaking completely through several traces and lifting others in the process.

Unfortunately the machine is so far out of production nobody I can reach seems to be able to find parts for the machine so I'm kind of left with either repairing the PCB or potentially building a new amp/power supply from scratch. I've decided that building a new PCB and learning the requisite electronics skills is within scope for me so that's why I've decided to do. I'm not particularly concerned with parts or time cost here since this is being done strictly at the hobby level.
So some more information.
I do have a scan of the service manual of an equivalent machine (the EX25) which was a contemporary paired down variant of my organ. I've checked the schematic for the amplifier and it appears to be effectively identical to my existing circuit board (
https://drive.google.com/open?id=1f77hB25Zf2Y-GpWfPzsY3qVCt8TnQD8V)
So far I've decided to take the following plan with the replacement project:
1. Redraw the amp/power supply circuit into modern CAD tool (I've chosen kicad)
2. Make a part list for each component and check for either modern equivalents or if the older components are still being produced just use those
3. Draw a new layout, keeping the existing physical foot print (due to mechanical constraints)
- I plan on using through hole components for everything so that I can more easily re-assemble the final product myself
4.

5. Profit?
currently I'm redrawing the schematic and learning some basics of kicad
Anyway, that's my project, thoughts?