Complete manuals, including service info, are available on the net. Google for SR620 manual Dave M W2GPS wrote: > Time-nuts, > > > > My SR620 has started reporting "test error 34" on power-up and will do > nothing after that. Does anyone know what that message means? I have a > reasonable lab and I would try to repair the unit myself but I have no > documentation. Is service documentation available or should I just > ship it back to Stanford Research to get fixed? > > > > Rick > > W2GPS