Yeah, that's the one. It looks like in the schematic it supplies brake current in one direction(Power amp, Direction logic, End of tape brake amp, Brake amp) and drive current( on the schematic it shows F-M1 I thought feed motor 1) in the normal position. Unless I'm not seeing it correctly which could be. A poor connection in the normal position could cause instability?
Since I changed it. It went four days without slowing down. Today however, it slowed down momentarily sped back up to nominal and then no further trouble. That would be a pain if this were a red herring. Or maybe only part of the problem.
RadarDoug do you say this could have no bearing on the slowing down ?