[Al Skierkiewicz]

Pat,
The power supply in the DSC is capable of several amps so it should handle two encoders. Is there any chance that someone unplugged the encoder connectors and put them back reversed? Some devices are reverse polarity protected and would produce a short if wired backwards and thereby cause the 5 volt supply to shut down. It is also possible that the power feeding the DSC has a loose wire. Does the 6 volt supply also shut down? If multiple power supplies shutdown at the same time, the input power is the likely cause.