I'm not getting all of the correct voltages out of my power supply. P2 pins 1 and 2 are giving me 2.36 volts which indicates a bad Q1 transistor. I replaced that with no luck. I'm getting 6.5 volts at R5 which is good, but on the other site of R5 I'm only gettying 1.2 volts. At R21 I'm getting 15 volts, but on the other side I'm getting 0. Both resistors test good. Is it possible that I'm losing current somewhere, but not voltage? Every pin on P2 and P3 that begin at IC1 are not correct. I've replaced IC1 with a new one.

Thanks for any suggestions.

Promoted items from Pinside Marketplace and Pinside Shops!

~~1,400~~

Machine - For Sale

Buck Rogers

New Brighton, PA

Coolpinballdino

$ 89.00

Electronics

Gottlieb System 1 Driver Board - LISY Development

That Old Pinball

From: $ 1.25

Playfield - Other

Galactic Posts (black with 'stars', for space themes!)

Rocket City Pinball

Great pinball charity

Utilizing pinball for the education of kids!

Pinball Edu

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!

This page was printed from https://pinside.com/pinball/forum/topic/gottlieb-system-1-power-supply-problem and we tried optimising it for printing. Some page elements may have been deliberately hidden.

Scan the QR code on the left to jump to the URL this document was printed from.