New! Dark mode!

Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!

(Topic ID: 274040)

Odd voltages on Weebly Bally Recifier Board


By Clnilsen

4 months ago



Topic Stats

  • 12 posts
  • 9 Pinsiders participating
  • Latest reply 4 months ago by Clnilsen
  • Topic is favorited by 1 Pinsider

You

Linked Games

You're currently viewing posts by Pinsider barakandl.
Click here to go back to viewing the entire thread.

#9 4 months ago

The unregulated voltages will not come up until the driver board is connected. The filter capacitors hold the voltage up near the top.

What is kind of confusing with Bally is they call one unreg supply 11.9vdc but it actually reads more like 15-18vdc when the driver board is connected. Yet they call the HV unreg supply +230v but it will not read that high unless the driver board is connected so they are kind of opposite each other in measurement whether or not hte driver board filter caps are in circuit.

Some DMM don't like reading the unloaded ripply HV for some reason too. I have one cheap DMM which will erroneously show really low volts DC at the rect test point when the driver board is not connected. The 100k, presumably for safety, resistor in series with the test point may have something to do with it.

Promoted items from the Pinside Marketplace
From: $ 45.00
Displays
PinballSolutions.eu
22
Machine - For Sale
Cleveland, OH
$ 119.95
Boards
Allteksystems
From: $ 40.00
Cabinet - Other
Rock Custom Pinball
From: $ 10.00
Electronics
Third Coast Pinball

You're currently viewing posts by Pinsider barakandl.
Click here to go back to viewing the entire thread.

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside