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Re: fisher 400 troubleshooting/repair

Posted by AJ on December 21, 2004 at 18:07:39:

Hi,
This is a common error in restoring these receivers. The 7868 outputs cathode v14 or v15 left channel use the cathode pin for grounding another component. If cathode resistors have been installed on all cathodes and the other component is still connected to the cathode pin then this WILL cause this problem.
Each cathode through a 10ohm resistor to ground only no other components connected to the cathodes of the outputs. If they are they must be separately connected to ground on their own. A schematic will make this obvious.
I doubt that this unit was working without distortion after the fisher mods...This is easy to do if you are not experienced in adding the cathode resistors in this unit...
Good Luck , AJ