(Topic ID: 109909)

System 80A Power Supply Voltage


By leothelowe

4 years ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 4 years ago by ChrisHibler
  • No one calls this topic a favorite

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#1 4 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

#2 4 years ago
Quoted from leothelowe:

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?

Your fine.

#3 4 years ago

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

#4 4 years ago

Ditto. No problem with what you've described.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#5 4 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?

#6 4 years ago

You can go up, but as long as you replace R10 (IIRC) with a 680 ohm resistor as the Wiki suggests, the 1W will be fine.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

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