(Topic ID: 250366)

Target leaf switch not working....


By jimgravina

51 days ago



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  • 24 posts
  • 4 Pinsiders participating
  • Latest reply 44 days ago by frunch
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#1 51 days ago

Posted this in a more specific category, maybe I will have better luck here.

After going through the switch check maintenance mode on my Data East machine, I have found that I have one target switch not working. Contact is being made, all wires are soldered and not loose, and I do not see any loose or frayed wires at the switch. I cleaned off the contacts and still nothing.

Any ideas how to locate the problem? It's just this one single switch, the rest of the entire machine works great!

In is the middle switch in the photos..not sure if this helps...

Thanks!
Jim

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#2 51 days ago

Diode could be bad. The switch matrix wires are daisy chained between switches, the wires on that row or column string could be broken on a different target before the switch you're having trouble with.

#3 51 days ago

So basically BETWEEN a working target and this one? Because all other targets work fine. Or could it be the diode on this switch itself at the bottom? Sorry, a bit new to all of this as far as pinball machines, but I do have a touch electrical experience.

Should be as easy as removing and soldering on a new diode yes?

#4 51 days ago

Which game is this?

#5 51 days ago

I don't really know how to read these matrix charts, but attached I highlighted the faulty switch.

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#6 51 days ago
Quoted from frunch:

Which game is this?

Data East - Back To The Future

#7 51 days ago

Thanks for posting the diagram. Notice the wire colors are labeled for each vertical column and horizontal row. You'll see the problem switch will have at least 1 green/yellow wire and at least 1 white/red wire. As gutz said, each of those wires will also daisy-chain to to other switches in the same row (the outhole switch, left return lane switch, mcfly switch, and M drop target switch will all have at least 1 white/red wire) or the same column (both other doc targets, spinner, lock vuk, left ramp, right ramp will have at least one green/yellow wire).

You want to check all those other switches that share the same column or row as the problem switch, and make sure the wires and diodes are firmly attached on all of them.

#8 51 days ago
Quoted from jimgravina:

I highlighted the faulty switch.

Any chance you have a broken wire between 18 to 26 or 26 to 34 ? Or a broken wire between 25 to 26 or 26 to 27 ?

LTG : )

#9 51 days ago
Quoted from LTG:

Any chance you have a broken wire between 18 to 26 or 26 to 34 ? Or a broken wire between 25 to 26 or 26 to 27 ?
LTG : )

Will take a look tomorrow! Thanks!
Jim

#10 51 days ago
Quoted from LTG:

Any chance you have a broken wire between 18 to 26 or 26 to 34 ? Or a broken wire between 25 to 26 or 26 to 27 ?
LTG : )

Checked this morning. I didn’t see any disconnected or broken wires at the points of contact with the rest of those switches (I didn’t check the rest of the length of wires because I ran out of time).

Hmmm....

#11 51 days ago

Be sure to check that the diode is firmly connected on each switch too. I usually give each wire and diode a gentle tug to make sure they're firmly connected to the solder lugs on each switch.

#12 51 days ago
Quoted from frunch:

Be sure to check that the diode is firmly connected on each switch too. I usually give each wire and diode a gentle tug to make sure they're firmly connected to the solder lugs on each switch.

Yeah, I did pull on the wires and diodes a bit...I was in a hurry this morning but everything did seem pretty solid.

#13 50 days ago
Quoted from jimgravina:

I didn’t see any disconnected or broken wires at the points of contact with the rest of those switches

Next step I'd grab a meter and quick check continuity in case there is a break you can't see.

LTG : )

#14 50 days ago
Quoted from LTG:

Next step I'd grab a meter and quick check continuity in case there is a break you can't see.
LTG : )

Yeah, I need to learn how to do that. But that will be after I get back from going out of town for labor day weekend.

Thank you all!
Jim

#15 45 days ago

Back from out of town...I tore down the playfield to give things a good cleaning, then it dawned on me. Would I be able to pass some fine grit sandpaper over the contact points of that leaf switch? I saw someone doing that in a video, but I also read that you should not file these switches. But since sandpaper is much finer, is this ok?

I still have not checked the switch matrix to see if there is a break somewhere, but thought of trying this first before I go down that route.

Thanks!
Jim

#16 45 days ago

Filing/sanding isn't recommended because it can damage the gold plating on the switch contacts. You can safely clean the contacts with isopropyl alcohol and a q-tip and/or wet a business card with iso alcohol and pull it between the contacts to clean them.

#17 45 days ago
Quoted from frunch:

Filing/sanding isn't recommended because it can damage the gold plating on the switch contacts. You can safely clean the contacts with isopropyl alcohol and a q-tip and/or wet a business card with iso alcohol and pull it between the contacts to clean them.

Yeah, I did try some alcohol and a q-tip the other day but still didn't work (so i thought maybe I needed to go a little coarser with sandpaper). So now it seems like there is a wiring issue somewhere...or the switch itself has just gone bad (is that possible, and I may just need a new switch)?

Jim

#18 45 days ago

Could just be a bad switch. You can test the switch for continuity with your meter. You'll need to push the switch contacts together with your meter leads hooked up to it, so it may be a little tricky.

#19 45 days ago
Quoted from frunch:

Could just be a bad switch. You can test the switch for continuity with your meter. You'll need to push the switch contacts together with your meter leads hooked up to it, so it may be a little tricky.

Yeah I was going to do that next either way, just trying to see everything that it COULD be. Ill report back if I find anything out! Thank you!
Jim

#20 44 days ago

Well I’ll be dammed. Leaf switch is suddenly working again. I removed the switch assembly from the play field to make continuity testing easier, turned out the switch itself was fine. Re attached the assembly to do further testing and it all of a sudden is working again!

#21 44 days ago

I realized that while trying to fix the switch, I was also in process of upgrading the whole machine to LED's. It didn't even occur to me at the time, but one of the original insert bulbs was burned out right next to the switch I was trying to fix...when the switch finally started working, I realized a new LED was in.

Could the switch not have worked because the bulb was out? Or is there some other miracle why it is now working...

Jim

#22 44 days ago

Maybe one of the solder lugs from the switch was touching something it shouldn't have been and removing and reinstalling may have alleviated the issue? I think the lamp being out was probably just coincidence. As long as it works!

#23 44 days ago
Quoted from frunch:

As long as it works!

EXACTLY! Thanks guys!
Jim

#24 44 days ago

Glad you got it sorted out! Enjoy!

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