(Topic ID: 223284)

Pinbot - two lamps light when only one should


By Brijam

1 year ago



Topic Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by Brijam
  • No one calls this topic a favorite

You

Linked Games

#1 1 year ago

I have two crossed columns on my Pinbot, 3 & 4. Each lamp on column 3 is coming on when the corresponding lamp on 4 is lit and vice versa, e.g. Uranus and Yellow 2 both coming on when either is lit.

I measured IJ7 and got these values:
1: 5.1v
2: 5.2v
3: 5.2v
4: 5.1v
6: 7.8v
7: 5.7v
8: 11.2v
9: 5.1v

So I think that means that something is wrong on the board, but I just don't know how to find out what it is. Help!

#2 1 year ago

Well, it means either something is wrong on the board, or your column wires are shorted together physically. Were you doing anything to this machine other than playing it? Have you looked for any wiring that might be dripped on or smushed? My off the cuff guess is that it's cpu related, but wiring is almost just as likely. If it is indeed on the board, you're probably looking at a bad U53, but if you were doing any repair in that area, it's very easy solder splash two pins together as well. Do you have a multimeter and know how to use it?

#3 1 year ago
Quoted from CadillacMusic:

Well, it means either something is wrong on the board, or your column wires are shorted together physically. Were you doing anything to this machine other than playing it? Have you looked for any wiring that might be dripped on or smushed? My off the cuff guess is that it's cpu related, but wiring is almost just as likely. If it is indeed on the board, you're probably looking at a bad U53, but if you were doing any repair in that area, it's very easy solder splash two pins together as well. Do you have a multimeter and know how to use it?

I don't think it's the wiring. The machine was recently transported, and I removed the board to have someone fix a bad transistor. The problem cropped up after that.

I do have a multimeter and I do know how to use it. I just don't know what to check.

#4 1 year ago

Well, unplug the lamp driver plug 1J7. Then measure to see if you have continuity between pin 3 and 4. That won't rule out a board problem, but if you have continuity you know for sure it is a problem with the board, most likely a drip.

#5 1 year ago
Quoted from CadillacMusic:

Well, unplug the lamp driver plug 1J7. Then measure to see if you have continuity between pin 3 and 4. That won't rule out a board problem, but if you have continuity you know for sure it is a problem with the board, most likely a drip.

Thanks, that was exactly what I needed. Turns out one of the bayonet bases was touching something it shouldn't have been.

Promoted items from the Pinside Marketplace
$ 36.99
Eproms
Matt's Basement Arcade
From: $ 16.95
$ 18.99
Eproms
Matt's Basement Arcade
$ 175.00
Lighting - Interactive
Professor Pinball
$ 44.95
Playfield - Toys/Add-ons
PinBoss Mods
Wanted
Machine - Wanted
Brantford, ON
$ 40.00
Lighting - Other
Rock Custom Pinball
4,994 (OBO)
Machine - For Sale
Vancouver, BC
3,000
Machine - For Sale
Manchester Township, NJ
$ 14.00
Electronics
Yorktown Parts and Equip
From: $ 40.00
Cabinet - Other
Rock Custom Pinball

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside