(Topic ID: 292553)

The Getaway >> ground short row message ON 6 ROW'S / standup targets

By TecumsehPlissken

2 years ago


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  • 11 Pinsiders participating
  • Latest reply 2 years ago by eyeamred2u
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#14 2 years ago
Quoted from TecumsehPlissken:

Update: I put game in switch test to check something else and noticed that both of the yellow stand up targets give messages of ground short row when triggered in test. The top right side Yellow says ground short row 1 , white brown (wire) and the Yellow target lower on the playfield in center says ground short row 2 white red.
[quoted image][quoted image]

Check for broken wires and shorts as stated by @pinballplusMN, then start working upstream to the boards, all the way back to the MPU and U20 chip.

#24 2 years ago
Quoted from TecumsehPlissken:

Removed the purple wire and added the diode to the outhole switch and that stopped it from reading "opto made loop" in switch test with the outhole and trough switches closed but I still have all of the ground row short error messages when testing all of those stand up targets.

The short error message seems like you blew out U20 on the MPU. Voltage went backwards without the diode protections and fried U20.

#27 2 years ago

After reading some older threads on the subject of multiple rows having ground row shorts at the same time I see opto's mentioned. How can these get grounded without being able to see it touching something? This game has at least 5 opto's

The only other chips on the MPU would be U18 and U19, and that would be a long shot.

You can unplug the optos and see if the error goes away.

#36 2 years ago

Wow, that is too many hacks. I second and third the sentiment to bring the game back to original condition so the shotgunning approach can be minimized.

Send the boards out for repair.

Repair any connectors.

3 months later
#39 2 years ago
Quoted from TecumsehPlissken:

In an attempt to get this thing back in the lineup for the operator who owns this game I reconnected things back the way they were. It wasn't until then that I noticed the metal ramp and all of the wire forms on this game were electrically energized. It shocked me when I touched the side rails with one hand and the ramp with the other. I measured approximately 72 volts with my meter. Then after looking around for awhile I discovered that the diverter coil that is mounted under the left side of the ramp had rotated and one of the lugs was touching the ramp. After fixing that and checking to make sure the ramp wasn't energized any more I rechecked those switches and they still have the ground short errors on them. I then replaced the ULN2803A chip with a new one and retested but the switch errors are still present. Question is there something else that could have likely gotten fried from the coil grounding on the ramp?

Anything In-Line on the could be bad. Replacing the chip is one way, but have you checked the resistors and capacitors on the MPU as well to verify they are all in spec? Are all your traces intact and have continuity from point to point? Have you reviewed PinWiki and the diagrams?

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