Hi, first time asking for help...been restoring a 1967 Gottlieb Sing Along, and after eight months of work, I pretty much have everything working, except for a reliably persistent scoring problem:

When the thousands reel is 1-9 (not zero), it advances simultaneously with the ones or tens reel, but ONLY when pulsed by the scoring motor. It you score just one or ten points, the thousands reel stays put, as it should (unless you're at 999, and then everything rolls over to 1,000 just fine).

So if your score is 1,000 and you hit the 50-point rollunder, the score will be 6,050. If your score is 2,345 and you hit a 5-point rollover, you'll see 7,350. BTW, max score on Sing Along is 9,999. Once the thousands reel hits 0 again, the errant behavior stops until the hundreds unit rolls over again.

Scoring motor used to keep turning when I first got the game game. I've cleaned and adjusted the score reel contacts and now everything resets just fine, all score reels reset to zero. I've been poring over the schematic, and I'm finding it hard to trace. Score motor 1A switch stack seems to be the source of the pulsing, but I don't understand how it "knows" whether to pulse the ones or tens reel, or does that even matter? Could it be something with the DS relay???

Any ideas are much appreciated!

Matt

Cleaned the DS contacts and it's fixed! Thanks so much, Dirt. I'm starting to understand the schematics better thanks to explanation like yours - I appreciate the extra effort highlighting the circuit path.