Lamp logic problem

(Topic ID: 181502)

Lamp logic problem


By polyacanthus

1 year ago



Topic Stats

  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 1 year ago by Quench
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

Hey guys, weird one here. Played a few games on my Star Trek tonight and the B rollover lamp is out all the time and the lower Y target lamp is lit opposite when it should be (off before hit, on after hit). Both lamps flash correctly during the test. Scoring is correct.

Seems like a logic issue. Is my ROM chip going or something?

#3 1 year ago

Did you by any chance tinker with anything on the game before this problem started happening?
Are any other lamps behaving strangely?

When the ROMs are going bad, the MPU board will fail the first test on power up and not start. ROMs aren't your problem.

#4 1 year ago

The last thing I worked on was the lamp driver board, replaced three SCRs to fix other lamps that were out completely. Those are good now. While I was there I replaced J1 and J3 headers. But these other lamps were fine for probably 10 games after that before they went wacky. It seems like it has to be a logic issue somewhere since they both blink fine on the diagnostic.

#5 1 year ago

Maybe a couple of wires got switched around on one of the lamp board's connectors?

Check the manual and make sure they are in the correct places.

#6 1 year ago

You just worked on the lamp board and now have some weird lamp issues - - - I think I see the relationship here....

Quoted from polyacanthus:

The last thing I worked on was the lamp driver board, replaced three SCRs to fix other lamps that were out completely. Those are good now. While I was there I replaced J1 and J3 headers. But these other lamps were fine for probably 10 games after that before they went wacky. It seems like it has to be a logic issue somewhere since they both blink fine on the diagnostic.

#7 1 year ago
Quoted from ForceFlow:

Maybe a couple of wires got switched around on one of the lamp board's connectors?
Check the manual and make sure they are in the correct places.

Good thought but I've checked that. As I said the Y lamp even changes when its target is hit, it just changes to the opposite of what it should be!

#8 1 year ago

Sounds like you have the Y target lamp connected to the output for the center Y lamp which lights in the opposite state.
Check and confirm these wire colors at the lamp board connectors:

J1-24 "B lane lamp" Wire color code 50 = White
J1-25 "Y target lamp" Wire color code 90 = Grey
J3-18 "Y center lamp" Wire color code 56 = White/Brown

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