This was also the case for some Bally pinballs, i did a host of grounding
mods to my Bally Space invaders pinball...
Pinx
----- Original Message -----
From: "Al Warner" <al@alsarcade.com>
To: <vectorlist@vectorlist.org>
Sent: Monday, September 15, 2008 7:22 PM
Subject: Re: VECTOR: Asteroids proper grounding and monitor DC reg bug.
> Gottlieb System 80 pins (Black Hole, Haunted House, Etc.) suffered from
> bad grounding from the factory. Later in the life of the company, they
> figured out that adding a second ground on one interboard connector cable
> would greatly improve reliability. This is a common fix for the older
> games (adding the lead) but the best method is to ground each board back
> to a common point. The system 1 games that proceeded them had other
> problems, but grounding wasn't one of them for some reason.
>
> js@cimmeri.com wrote:
>>
>>> John wrote:
>>>
>>> At this time Gottlieb pins electronics were designed by Rockwell
>>> engineers and that explained why they were having trouble with coil
>>> failures - Rockwell designed a proper system using a star ground, but
>>> they allowed no redundancy.
>> So, did the Gottleib pins work initially, and only have trouble after
>> something in the ground system degraded? What degraded?
>>
>> JS
>>
>>
>
>
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Received on Mon Sep 15 15:05:46 2008
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