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Burning resistor ( SA1000 ps board)

The Fuxtor

The Fuxtor

Addicted Member
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. Also the power supply board has been recapped already and re-transistored.... After completing that board I checked the unit with the dbt but just briefly to confirm no shorts...
 

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That's the -45VDC supply for the amplifier input diffs and VAS stages. Recheck your work on the amplifier boards as that's the only place the -45VDC goes.

Craig
 
llwhtt said:
That's the -45VDC supply for the amplifier input diffs and VAS stages. Recheck your work on the amplifier boards as that's the only place the -45VDC goes.

Craig
Click to expand...
Thanks for that info! I seen that pin 13 (? ) was coming from amp board running -45v , but couldn't connect .....
Anyway I indeed had a set of transistors put in with wrong sub... Seems all good again. I would have been checking that ps board for a week!
 
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