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Burning resistor

Pioneer Audio | Audiokarma Home Audio Stereo Discussion Forums - audiokarma.org
Been restoring a Pioneer SA-1000. Got to the main amp boards and after completing caps and transistors fired it up for a test under DBT and discovered R1 ( 330 ohm) on the power supply board started smoking. Before I start checking components on that board, what would my best/ logical approach be? The pioneer service manuals are excellent as far as details go , thinking maybe I'm missing something obvious??

EDIT: my bulb dimmed out on power up.

 

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