Racal-Dana F64 Schematic?
 

I have a Racal-Dana F64 function generator that I'm trying to repair
for a friend. It has the ability to function as a frequency counter
for an external input, this appears to work without difficulty. I have
not, however, been able to make it generate a signal. When switched to
input, the frequency display reads zero. Does anyone know where I can
a schematic for this machine? Any help is greatly appreciated.