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Old 09-26-2016, 07:11 PM
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N2IXK N2IXK is offline
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Join Date: Apr 2011
Location: Sittin' on the "Group W" bench...
Posts: 799
If I am reading the diagram properly, it looks like the VFD filament comes from the dial lamp winding on the power transformer via a resistor network consisting of R650-R653. Check these for opens/off value. You want to see 3VAC across the ends of the filaments, and you have less than half that. Does the unit otherwise work? Did the unit get shifted into 240V power settings, perhaps?
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