I've never had an LED causing failure of an amp.
Intermittently o/c losing the fan supply ok signal that goes through this
LED to the pa causing it to shut down . Also not passing current to the
power-up hold-off circuit so pa failing to come on, thinking the fan supply
was absent. Like the fan lytic, both perched right on top of two large
droppers on the ps board.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/