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Also . . .

Posted by sgmlaw (A) on December 22, 2004 at 07:41:12

In Reply to: fisher 400 troubleshooting/repair posted by mattk on December 21, 2004 at 07:01:34:

. . . if you are having problems only in one channel, the circuit tracing shouldn't go too far to find the cause. Problems originating nearer the supplies tend to affect both channels. Start close to the active components in the affected channel and it should be a quicker diagnosis.

Your post suggests that the unit operated normally when you took delivery but failed thereafter. But if the problems predated your possession, an issue such as AJ has pointed out involving careless mods becomes a valid concern. A properly reconditioned Fisher should be rock solid reliable for many, many years. Typically, 95% of these instruments never need any attention, ever. It's that other 5% of the circuit that wears out and often gets botched up in service. I'd carefully inspect all the "mods" done. Pay special attention to all service soldering and redo every joint that may be the least bit suspect. There are a lot of hackers out there, including some who are paid professionals at it.

Good luck!

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