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Title: Power Supply Issue that's Not Post by: cfh on December 19, 2008, 10:34:04 PM So like a crazy person, i bought 21 model 40x williams slots.
i have been working on them, getting them going. One i had was a Magic Lamp dotmation. with the coin tray removed, the game worked fine (no sound though as the speaker is part of the coin tray.) Hook up the coin tray, and the game won't boot. The three center LEDs on the driver board are out too. I should mention i am running a switching computer ATX power supply for both the lower and upper power supplies (one power supply replaces both the original upper and lower supplies). What was the problem? the speaker! i measured it with a DMM and it was only 2.7 ohms (it is labeled as an 8 ohm speaker). The speaker should obviously measure 7 to 8 ohms. So the speaker was bad, and dragging the 12 volts down (used for the amplifier) and not allowing the game to boot. This happens because the computer power supplies will shut down a voltage if that voltage is powered to a near short (which this was). It also takes about 10 seconds of power-off for these computer power supplies to reset themselves and to turn the problem voltage back "on" at next power-up. Interesting stuff. Title: Re: Power Supply Issue that's Not Post by: stayouttadabunker on December 20, 2008, 02:58:40 AM CFH,
Can I ask you...I'm learning really,..what's a DMM? :103- Which model you have...I think I'd like to get one. :89- Thanks for any help you can give me... :91- Title: Re: Power Supply Issue that's Not Post by: PWRSTROKE on December 20, 2008, 03:15:17 AM I am quite sure he meant DVM -Digital Volt Meter -Which we all know- :103-. I guess with 21 plus games you could get mesmorized--- :103- :97- :96-
Title: Re: Power Supply Issue that's Not Post by: a69mopar on December 20, 2008, 03:16:14 AM digital multi meter would be my guess
Title: Re: Power Supply Issue that's Not Post by: dpalmi on December 20, 2008, 03:18:09 AM Can I ask you...I'm learning really,..what's a DMM? :103- Digital Multi-Meter - same as Digital Volt Meter or DVM... Dan #2 Title: Re: Power Supply Issue that's Not Post by: PWRSTROKE on December 20, 2008, 03:24:56 AM Yea, Ford calls em dvom's --same diff. volts/ohms etc. etc.
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