(Topic ID: 68323)

Williams System 11 Bullet-proofing Thread

By Schwaggs

10 years ago

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140 posts
54 Pinsiders participating
Latest reply 1 year ago by Inkochnito
Topic is favorited by 252 Pinsiders

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F-14 Tomcat Williams, 1987
Millionaire Williams, 1987
Whirlwind Williams, 1990

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Is this 11B worth trying to save? So I removed U41, LM1455 , SR16 and battery holder so far. 2 traces previously repaired that run under battery by op. I have a Hakko 808 but it couldn't get the solder from the top side. I ended up cutting the prongs from removed parts to avoid damaging the solder pads.

Scr2 has a splitting outer case I guess from heat? Current status before removing parts was rapid blinking of diagnostic led.

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Also there were no coils on the PF working when it was booting up. All fuses test good with meter.

Quoted from radium:
I've repaired two Sys11 boards in this state, but they were not reliable and always had odd problems. I'm sure a pro could do better. These days there are many options for new Sys11 boards. I would probably desolder any useful clean components and toss the rest.
Also check your harnesses and see if battery juice has traveled into the wiring. You'd be surprised how far that stuff can go.

Kinda the response I was expecting. I already prepared the owner of this possibility. The RD is $460 though ouch.

I'll check the connectors. I know the ribbon cables look iffy.

Quoted from LateCenturyMods:
Quite a mess to clean up there. I would order a Dumbass replacement board and transfer the parts over.
Edit: https://pinside.com/pinball/forum/topic/dumbass-test-and-reproduction-pcbs

Cyclone is back!! Thanks for telling me about the DumbAss CPU. I also ordered a board for HS, though the original is working, I wanted to have a backup.

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