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8100 Magnetek PSU - does the fan always run?

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I bought a used PSU (Magnetek 3390-20-001) from, I believe, an 8100 to replace the dead and unsalvageable PSU from a project Quadra 800 I have.


It all works fine but the fan didn't run at all during my limited testing.


Is the fan load/thermal operated on this PSU, or is mine faulty?

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