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  4. » Gottlieb System 80 Pop Bumpers Locking on
(Topic ID: 203464)

Gottlieb System 80 Pop Bumpers Locking on

By the96stang

6 years ago



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popbumper_board_schematic_corrected (resized).jpg
popbumper_board_schematic_original (resized).jpg
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#1 6 years ago
OP
 
BKB

the96stang

Bushey Bro's

US Enfield, CT

12y 122K 2,940 16 13

I have a James bond that has 2 of three pop bumpers locking on. I have replaced all 3 boards with brand new pop bumper boards and I have tried multiple rebuilt tested and working driver boards. Where do I go from here?

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#2 6 years ago
 
???

KenLayton

In Memoriam

US Olympia, WA

12y 83,400 5,965

Is the coil diode missing on the bumpers in question?

If the diode is present on the coil, are the wires connected to the correct sides of the diodes?

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#3 6 years ago
OP
 
BKB

the96stang

Bushey Bro's

US Enfield, CT

12y 122K 2,940 16 13

All coils have a diode on them. The soldering looks original, so I would assume the wiring is correct. would a connector being repinned incorrectly cause this? Mainly concerned with J6 on the MPU because it was repinned prior to me owning it.

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#4 6 years ago
 
???

KoP

Pinside member

10y 16,150 76

J6-9 is the ground for the popbumper boards. If that connector isn't reliable the popbumpers will lock on.

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#5 6 years ago
 
INK

Inkochnito

Pinside member

NL Piershil

12y 91,650 3,169 12

Maybe this can help.
Here is a schematic of an original board (page 36) and a corrected schematic (page 36A).

popbumper_board_schematic_original (resized).jpgpopbumper_board_schematic_original (resized).jpg

popbumper_board_schematic_corrected (resized).jpgpopbumper_board_schematic_corrected (resized).jpg

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