Where to go about finding used boards?

Buchy

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I am looking for used (but working) boards to a pinball machine "Laser Ball"

Any ideas/suggestions where to start is apprecaited.
 
Psoting in the wanted section here is a good start. Also try posting on the Mr Pinball site. Of course, looking on eBay is always an optioin as well.
 
You also need to note that this is a Williams "System 6" Pinball games. I'm not familiar with that boardset (others will correct me if there is a catch), but as a general rule any System 6 boardset will work in your machine with the correct game ROMS.
 
checked rottendog and it seems they are out of stock on the sys 6 power boards

http://www.rottendog.us/products.htm


Watch out for the HV section on their boards. They drive the regulators far, far beyond the manufacturer's "absolute maximum" ratings. There's a reason why they're the "lowest cost provider of replacement pinball circuit boards".
 
Watch out for the HV section on their boards. They drive the regulators far, far beyond the manufacturer's "absolute maximum" ratings. There's a reason why they're the "lowest cost provider of replacement pinball circuit boards".

Interesting to know, Ed. I have two different power supply boards from them and have no issues to date.
 
Interesting to know, Ed. I have two different power supply boards from them and have no issues to date.

While designing my own HV supply - I was evaluating single HV regulators. There were two major players out there that considered themselves HV regulators.
National Semi with their LM317HV and Texas Instruments with their TL783.

TI was going thru a major revision of the TL783 at the time and had issued an errata sheet so I ruled them out until they could get their ducks in a row (and have done so since then). This part can have inputs upto 125V with outputs varying anywhere upto about 120V. Would have been a perfect choice for Gottlieb System 1 and System 80 power supplies.

National has their part intended for a HV supply with a max output of 57V. It has a max input to output differential of 60V. Some argue that this means the maximum from input to output would be 60V so you should, for example, be able to go with a 120V input to a 100V output (20V differential) with no problem. Not true according to the FAE. He said you MUST consider two issues with these: 1 - what happens if output is shorted or has a near short. 2 - you always have a huge differential at the instant of turn on. Input voltage goes to 120V but output hasn't turned on yet and is still at 0V. He said with enough turnon/turnoff cycles, this -will- eventually kill the part. Not surprisingly, I sell lots of replacement LM317HVT regulators....

I then showed the FAE an application of using these in the HV section of Williams or Bally boards... he just laughed and said "yeah, right...."

Ed
 
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