(Topic ID: 231367)

Williams System 6 Firepower won't boot


By rlbohon3

2 years ago



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  • 32 posts
  • 13 Pinsiders participating
  • Latest reply 7 months ago by Brewchap
  • Topic is favorited by 7 Pinsiders

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#29 7 months ago

First posting - not sure to the rules Of the forum but adding to this topic since it may be related.

I just pushed to 3 my pinball collection by buying a Tri-zone, a system 6 machine. It does not boot up. I have 2 LEDs on constant with play field on. No display lights although from an angle I can see there is power going to them.

When I first fired it up, I had some numbers going to the displays that eventually went away.

My question this: I have checked the voltages and I am only getting 9 Volts DC in the 12V unregulated supply, both on the MPU board and on the power board. The 5V is good. The F5 fuse and the C15 capacitor all have 9 V going to them.

Any ideas on what could be limiting the voltage from reaching the 12V dc?

Thanks,

Indigestion

1 week later
#31 7 months ago

Thanks for the response and intel. Here is further results of the ongoing investigation.

Now I disconnected all the connectors to the Power board except for the input F1 and F2. I have removed the F2 and F3 fuses. Now When I power on, I get the 12v DC unregulated on the 6 pin! What does that tell you?

However, when I do a diode check on the D7 and D8 diodes, I am getting .4V with DMM in diode setting in both directions. I am seeing that malady on both diodes.

I may also have a grounding problem. I swear I am getting a current from the rails to my fingers and got a reasonable shock one time I touched the metal surrounding the transformer.

What is your best prognosis? Buy a new PS board? Buy a new set of diode?

Thanks,

indegestion

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