7 opto trough niggle

[Jon Fletcher]

Got a JD with an annoying trough fault.
Getting error on boot up “check switch 82 trough 5”
I’ve fitted a new transmitter board and changed the leds on the receiver board but fault still persists.
The result is that on multiball instead of 4 balls being launched all the balls are launched and the feature finishes with 2 balls still in play.

 

[Spandangler]

Have you checked for cracked solder joints on the connector?

Failing that it could be one of the LM339 chips....

But I know nothing

 

[Jon Fletcher]

Have you checked for cracked solder joints on the connector?

Failing that it could be one of the LM339 chips....

But I know nothing

I’ll check the solder joints. What is lm339?

 

[Moonraker]

Take the balls out and put the game in switch test mode. Add a ball at a time to confirm the switch 82 fault report.

Don't check the connector joints, just re-flow them, the hairline crack is normally finer than most people's eyes can see.

If it's not the connector then work your way through this:
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Trough_opto_boards

I think it's very unlikely to be a LM339 issue.

 

[Jon Fletcher]

Take the balls out and put the game in switch test mode. Add a ball at a time to confirm the switch 82 fault report.

Don't check the connector joints, just re-flow them, the hairline crack is normally finer than most people's eyes can see.

If it's not the connector then work your way through this:
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Trough_opto_boards

I think it's very unlikely to be a LM339 issue.

Thanks mate.

 

[DRD]

I had a weird intermittent opto fault on a game, TZ I think. Same era as JD. The opto boards get do quite hot. I replaced optos, chips, reflowed solder on pins.... Eventually I found a cracked track on the board right next to one of the pins

 

[Jon Fletcher]

I had a weird intermittent opto fault on a game, TZ I think. Same era as JD. The opto boards get do quite hot. I replaced optos, chips, reflowed solder on pins.... Eventually I found a cracked track on the board right next to one of the pins

Thanks