One of my clients is a collector of drum computers, mostly from the 80's. What should not be missing is a Forat F16 drum machine sampler, advertised at the time with "Sampling in CD quality", which is absolutely true. First he bought these two defective devices. Then another system later. Ultimately, I managed to create at least one working system out of the three.
The first two systems were a challenge, as Bruce Forat does not provide any service documentation. At least my inquiries regarding the F16 remained unanswered. I still managed to bring the system to life, at least partially. What I didn't know at the time, however, was that I had two defective CPU boards.
The third Forat F16 system, which my customer recently bought, did not give off any muks either. However, these were mainly power supply problems. The switched-mode power supply had a number of cold solder joints and defective components. Apart from the fact that I had spare power supplies, I recommended my customer to install a new, modern switched-mode power supply.
There were a few minor problems. Defective tantals, contact problems, the Sysquest drive had given up, the whole system should be converted to 230V. But, I got at least one system up and running and found out that I now "only" need one CPU card to get another F16 system up and running.