(Topic ID: 256888)

F14 Reset Issues, may be applicable to other System 11s. Need help

By Djshakes

4 years ago


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  • 20 posts
  • 9 Pinsiders participating
  • Latest reply 4 years ago by GRUMPY
  • Topic is favorited by 1 Pinsider

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#1 4 years ago

Hi All,

My F14 started resetting. I have read bad diodes can cause this. I replaced the diodes on one flipper coil. The others look fine. It resets when I first turn on the game for about a minute or two...especially when double tapping the flippers. Then it stops so I am thinking it isn't a diode issue but possibly a power board issue until the game heats up? Bridge Rectifier? Sometimes the issue goes away if I power on the machine and power off. Any suggestions before I shotgun all the diodes?

#4 4 years ago

Thanks, I'll check this tonight. Not sure what "8.1 mV AC ripple" is but I can use my dmm to test for 5v. Do you just do it without firing any coils or should I have someone flip when I'm testing?

Would this solve it if indeed on board?
https://pinside.com/pinball/market/shops/1129-yorktown-parts-and-equip/01493-williams-system-7-11a-power-supply-capacitor-rebuild-kit

#5 4 years ago
Quoted from Djshakes:

Thanks, I'll check this tonight. Not sure what "8.1 mV AC ripple" is but I can use my dmm to test for 5v. Do you just do it without firing any coils or should I have someone flip when I'm testing?
Would this solve it if indeed on board?
https://pinside.com/pinball/market/shops/1129-yorktown-parts-and-equip/01493-williams-system-7-11a-power-supply-capacitor-rebuild-kit

Thinking maybe I swap C10 cap just to be safe as it probably needs it anyway.

#6 4 years ago
Quoted from wayout440:

The fact that it resets when you power it up and the issue coming and going with power cycling are pretty good clues that it probably isn't a playfield diode at fault. Check +5VDC logic supply at MPU IJ17 Pins 4,5,6 = +5.03 VDC @8.1 mV AC ripple. You might have a failed filter capacitor or bad regulator, or even a bad cable crimp. Increased current draw when activating your flippers is likely causing the supply to dip enough to trip a reset.

I try testing this but not sure I'm doing it correctly. Setting my dmm to dcv. Unplugging ij17 and testing wires coming from power supply into that cinnection. Readings are all funky.

#15 4 years ago

Hi all. I got a u10 pia failure when I turned game on this morning. I ordered the rebuild kit I linked above. Here are my readings at ij17:
1: 1.3
2: 1.3
3: 1.2
4: 4.98
5: 4.98
6: 4.98
7: key
8: - 14.10
9: 10.60

4 thru 6 are below 5. Assuming that is my issue?

I pulled connectors on powerboard and reseated. Got 4-6 up to 4.99 volts but still below 5.

#17 4 years ago
Quoted from wayout440:

4.98V isn't bad for the DC voltage. What was the AC ripple voltage?...that will provide info as to if the filter caps are good. You might also try the flipping again while measuring to see if there is any change. If you find one flipper causes it but not the other, I would be suspicious of a failed flyback diode on that particular flipper circuit.
Here is also a link to some discussion about the U10 failure message:
https://pinside.com/pinball/forum/topic/u10-pia-failure-where-to-find-and-replacement-repair-advice

I'll test out the ripple voltage tonight. I think I researched enough how to do it. I think it is the setting with the wave over the "V" on the DMM.

#19 4 years ago
Quoted from wayout440:

That is correct.

Ac ripple was 0. I'd get a quick reading when I touched the test points but always settled back to 0.

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