(Topic ID: 150751)

Right coil not working, suspect flipper button circuit


By Qmay

4 years ago



Topic Stats

  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 4 years ago by Qmay
  • Topic is favorited by 1 Pinsider

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#1 4 years ago

Hi all,

Working on my Jokerz! Replaced both of my flipper assemblies (very worn) but both were working. Replaced coils at same time since neither matched the correct part number. Now, left flipper working, right flipper is not.

Things I've checked that are good:
F5 & F6 fuses are good.
Voltage at all coil lugs is ~70V.
Resistance across flipper lugs relative to common lug is 4.6ohms, voltage return lug goes to 155ohms when EOS switch opens (both coils).
Voltage at flipper button ~170V (both flipper buttons).
Resistance across flipper buttons goes to 0 when button pushed.

Other symptoms:
In play mode, left flipper button changes lane lights, right does not.
In play mode, left coil voltage at outer lug going to EOS (blu-gry wire lug) goes to 0V when flipper button pushed. Right coil has no voltage change at same lug (blu-vio wire lug).

Not sure where to turn to next, assuming it's in the circuitry in the backbox? Any thoughts? Help greatly appreciated!

#2 4 years ago

Confirmed in switch test in diagnostic mode that right flipper button isn't registering.

Next steps?

#3 4 years ago

Would a bad transistor at Q67 affect only 1 flipper?

#6 4 years ago
Quoted from 0geist0:

Clean the flipper button switch?

Flipper button switch worked before coil swap. Also, I checked continuity when not pressed vs. pressed and everything is as it should be.

So I followed the schematic for the right flipper as per
http://mirror2.ipdb.org/files/1308/Williams_1988_Jokerz_Schematics.pdf

I have no continuity between 2J5 and 2J10 for the right flipper switch trace. Left flipper trace between the two is good. It looks like a trace burned up. I'm going to try to bridge them and see if that fixes it.

#7 4 years ago
Quoted from Qmay:

Flipper button switch worked before coil swap. Also, I checked continuity when not pressed vs. pressed and everything is as it should be.
So I followed the schematic for the right flipper as per
http://mirror2.ipdb.org/files/1308/Williams_1988_Jokerz_Schematics.pdf
I have no continuity between 2J5 and 2J10 for the right flipper switch trace. Left flipper trace between the two is good. It looks like a trace burned up. I'm going to try to bridge them and see if that fixes it.

Confirmed, burned up trace between 2j5 and 2j10, was obvious just by looking at the circuit board. Bridged the trace and it's working.

This thread helped me get to the conclusion, even though it's quite confusing at times: http://forum.arcadecontrols.com/index.php?topic=117461.0

In short, checked the continuity between connectors, found a burned trace.

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