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Arcade Collecting => Miscellaneous Arcade Talk => Topic started by: MonitorGuru on August 25, 2005, 09:56:12 am

Title: Galaga PCB repair log and power question
Post by: MonitorGuru on August 25, 2005, 09:56:12 am

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Title: Re: Galaga PCB repair log and power question
Post by: Ken Layton on August 25, 2005, 10:42:57 am

Every Galaga I've ever seen has always had a high pitched whine in the sound. Galaga is also a game that needs the power cranked up. I recall an old service bulletin Midway issued stating to crank the supply to 5.2 volts.

The random lockups/resets are due to a timing error between chip manufacturers. Midway issued a service bulletin on that (in a big blue covered "Midway Service Bulletins" report cover) stated something there was a timing compatibilty error between manufacturers of certain chips on the board. It said to be sure chips at certain locations were all the same manufacturer or something like that.

Title: Re: Galaga PCB repair log and power question
Post by: Ken Layton on August 28, 2005, 12:54:06 am

Alot of times the tiny ceramic disc capacitors at the very edge of the circuit boards get damaged/hairline fractured from sliding down the tracks of that card cage frame.