Omaha, NE
Measure the 42V from power supply.
You mention the 6 digit displays are a bit dim-- measure the 60V as well.
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The 60V is high which pulls the 42V high along with it.
68 should work but makes me curious as to why it is so high. I thought they used the standard series pass regulator which normally puts the voltage in the 62-63V range.
Regardless - now check the voltages at the small display. Could be bad connection.
Check the +5VDC, the 3VAC and 42VDC *at the 4 digit display*.
Also check the offset voltages going back to transformer. This is a 5VDC and 8VDC wire going back from power supply to the transformer.
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