Hey everyone! I just bought HS a couple days ago, so I’m excited to join the club. This one is pretty rough. Paint is worn almost completely off of the right side of the cabinet, and probably a 4/10 on the left side. A lot of cracked plastics, of course the obligatory 15 or so bulbs burnt out, and a cracked main ramp. I’ve already ordered $600 worth of stuff to get it pretty, but more importantly I have a couple questions on electronic issues.
The machine checks every box in switch test/coil test, and plays fairly normally… for a time. Two major issues have appeared on the several games I’ve put in, however.

The laser kick coil fires perfectly about 50% of the time. Sometimes it fires three times, with the third being the one that actually kicks the ball out. Sometimes it fires very softly, only gets the ball halfway up the playfield. Sometimes it tries to fire a couple times, sluggishly, and then gives up and drains the ball.

The second, and more worrisome, is the machine is locking up during gameplay, perhaps 10% of the time. If it locks up during a sound being played, the sound is drawn out until it slows to 0hz. Once, it was in the middle of ball 2 and just randomly went straight into attract mode.
When it locks up, the top display shows nothing and all switches and coils cease operation. It can be immediately rebooted and will go back to normal play, but has no memory of credits that may have been there. (This is a location machine so not free play)

I’m excited to get this machine restored to its former glory; I’ll post “before” pics this weekend! Would love any insight into the above issues; I’ve read about 1/3 of this total thread so far and haven’t seen them crop up yet. Cheers y’all.

GRUMPY are you talking about

In inspecting the power supply, I found one wire that was sheared almost through. Resoldered that wire and so far no more lockups. The laser kick coil is still firing a bit erratically though. I have new rubbers and plastics on order, so when I start going through those I’ll be checking that switch and coil voltage.

Promised before pics over the weekend.. well, it’s Monday night, but y’know.
Cabinet is on the struggle bus, there’s some playfield wear (do the light plastics usually pop up through the playfield? Cause these actually affect ball movement….) and the rubbers are all dry-rotted. Here’s a few shots of the current condition.

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Did this, and the switch registers 100 out of 100 times in switch test. During gameplay, however, the coil is still firing multiple times occasionally: It fires early the first time, essentially just stopping the ball. Then it fires quickly a second time, which bounces the ball a couple inches, then on the third fire it actually kicks the ball back into play. The sound is like "pop pop... fire." But out of about 12 games today, it's only happened twice. It fires perfectly every other time.

Just went around the corner to an auto parts store and got the exact same relay and installed it. Still having the same symptoms; here’s a video of what it’s doing.

https://vimeo.com/704191885