Gulfstream odd electrical problems

(Topic ID: 238419)

Gulfstream odd electrical problems


By DCRand

6 days ago



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  • 13 posts
  • 4 Pinsiders participating
  • Latest reply 3 days ago by DCRand
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#1 6 days ago

Working on a Wms Gulfstream that has PF and Back glass lights, and nothing else. Manually triggering the reset relay resets the scores but then stops and no response anywhere. What is odd is that there are two unusual electrical readings on my meter.

A:One side of the start button switch reads 18.1 volts, the other side zero - until pushing in the switch. Then both sides read zero. Can't understand how the powered side of the switch would go to zero also when switched pressed. Jumped the lugs on the back of the switch stack, same result.

B: The flipper buttons, including all leaves on the left switch read appx. 24 to 28 volts before buttons pressed. Both sides of most PF coils, including flipper, pop bumper, kickout holes, and some relays, read appx 24 to 28 volts across both or all three lugs on the coils. But none are firing. Unplugged the play field and back box jones plugs, and while of course the pf coils now read zero, the cabinet switches still show voltage on all leaves of the switches, except for the start switch which reads as noted above.

Not sure if these two problems are related or separate. Can't find any switches that look closed when should be open. Can't find any obvious wires that are disconnected, shorted, etc. but could have missed something.

Any suggestions would be appreciated.

#2 6 days ago

If the Replay button on the front door doesn't activate the Coin relay, Inspect and diagnose this circuit with Alligator clip jumper wires
http://www.planetimming.com/Pinball/troubleshooting/EM%20Troubleshooting.pdf
http://www.pinrepair.com/em/index3.htm#features

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#3 6 days ago
Quoted from DCRand:

What is odd is that there are two unusual electrical readings on my meter.
A:One side of the start button switch reads 18.1 volts, the other side zero - until pushing in the switch. Then both sides read zero. Can't understand how the powered side of the switch would go to zero also when switched pressed.

The path to ground has less resistance than your meter. That's why you read 0. Doesn't mean there's anything wrong with your meter that's just how it works.

#4 6 days ago

Thank you both, will check the circuit after work today.

#5 5 days ago

In starting to trace this circuit, noticed the ball count unit didn’t look right. It’s just above the replay unit in the back box. It was somehow out of alignment like it had been manually turned past it’s normal stop point. Cleaned and put it back in correct position and game started.

For a few seconds. Mildly loud buzzing and 20 amp fuse blew. Three fuses later ..... can start machine and game as long as no ball in trough. Tilt light is on, and pushing ball trough switch then causes buzzing and seconds later blowing fuse again.

#6 5 days ago

Still trying to trace, will post when more info.

#7 5 days ago

Well no luck so far. Tried to isolate various wire paths. Checked all tilt related switches. Can’t find the short. Have the schematic, but haven’t been able to trace all tilt circuit related wires .

#8 5 days ago
Quoted from DCRand:

Mildly loud buzzing and 20 amp fuse blew. Three fuses later ..... can start machine and game as long as no ball in trough. Tilt light is on, and pushing ball trough switch then causes buzzing and seconds later blowing fuse again.

Check this circuit (odd-no Tilt relay!) Also, I don't see a 20A fuse in there; replace with the proper one.

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#9 4 days ago

Thks for advice. No tilt relay made it harder to track with my limited knowledge. And about a third of relays aren’t labeled. Will have to look at fuses closer, just replaced w what was there.

#10 4 days ago

Without a breaker is there a way to test the fuses circuits without just going through a dozen or so fuses?

#11 4 days ago
Quoted from DCRand:

Without a breaker is there a way to test the fuses circuits without just going through a dozen or so fuses?

Do a search for breaker fuses.

#12 4 days ago
Quoted from currieddog:

Do a search for breaker fuses.

Found the modified breaker fuse suggestions on Pinside. Just haven’t bought any yet. Looks like trip to Harbor Freight.

#13 3 days ago

Well, still haven’t found short. But found broken plastic on lock coil. So on hold till order new one.

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