(Topic ID: 109909)

System 80A Power Supply Voltage

By leothelowe

9 years ago



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#1 9 years ago

I have an Alien Star I'm trying to get going.
I have a laundry list of adjustments that I still need to do.
1) Rebuild of Power Supply.
2) Grounding of boards (CPU, Power, Driver)

My question has to do with the 12V supply from the bottom board.
When I measure the voltage at the Bridge Rectifier I get 16VDC.
Replaced Bridge and had no change.
Transformer is giving me 12.5 VAC correctly.
I currently have a 10000 uF 25 V capacitor installed for the 6800 uF 25 V.
My other currents are 60 VDC (measured 65.7 VDC), 42 VDC (46 VDC).
Is this a standard voltage output or is it way out of tolerance?
If it is way out of tolerance where should I begin my investigation?
Thanks
Jim

#3 9 years ago

Thanks.
I kinda figured that there might be some overage for the entire system when it's loaded.

#5 9 years ago

I've got another question regarding the 8.2 Zener Diode at CR7 on the power Supply board.
Pinwiki suggest a 8.2 V 1 W as a replacement where as the schematics have a 8.2V 2 W.
I thought it would be safer to go up in wattage not down?

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