This video of Revox A77 replacing the power supply board, speed supply boars and other components with the intention to resolve the capstan motor not functioning until now .
Did you fixed it finally because I have an issue with the capstan motor too on my A77 MkIV I got from a retired man who stored the machine for 40 years + without touching it. The machine looks brand new as it was just getting out the factory assembly line. When I first powered ON yesterday, the capstan motor never starts but the flywheel is running freely.