8270 Spotting Solenoid issues

[PhilDawson]

AMF 82/70
MP Chassis
Accuscore 2 w/Advantage


I have been trying to chase down an intermittent spotting fault on one of my machines, around 8 or 9 times over 6 games it will not spot pins. This seems to be caused by the spotting solenoid buzzing and either not engaging the eccentric drive, or that it doesn't keep the spotting latch locked.

The first thing that I did was the obvious, and changed the solenoid, didn't help, switched chassis over, fault stayed on the machine.

I have re-pinned the C1 plug, and still the fault is there.

I noticed that the spotting arm rocks back off the latch a little at the same time my spotting cups rock during spotting, and thought that this may be the issue, but it's only when the solenoid does not run correctly that this happens.

While watching the machine, I heard the MP Chassis buzzing, the Sweep-Run Ice Cube Relay buzzes on and off fast during spotting, at this time is also when the spotting solenoid has issues, in fact, if I remove the pin from 9 pin position so it doesn't spot, the relay still buzzes, now I have tried swapping the relays around, and also tried swapping the chassis, and the fault remains on the lane. The buzzing of the sweep relay seems to correspond with when the spotting solenoid plays up.

This has also had 3 different solenoids on, and currently has one on that came from a good machine, why would the buzzing sweep relay cause issues with the spotting solenoid? Additionally, what could be the cause machine side?



To review,

Fault: Spotting Solenoid Issues, sweep relay buzzing at same time as solenoid issues

Tried: New solenoid, known working solenoid, different chassis, different relays, re-pinning the C1 plug, remaking Crimp connections for the Spotting Solenoid

Any help is much appreciated, as this lane is starting to drive me insane!

[slb785]

Have you checked for a short in your wire way at the other end of the spot solenoid wires? I've replaced a couple of my spot solenoid wires from the terminal strip to the solenoid because the insulation has fallen off from 40+ years of age

[AMFDOCTOR]

Is the table motor coasting? If it goes past zero, then you'll get a no spot. How about the shuttle stop block screw? Could be catching. A bad roll pin in the eccentric. These are a few that come to mind right off the top.

[Tablejam]

Is the table motor coasting? If it goes past zero, then you'll get a no spot. How about the shuttle stop block screw? Could be catching. A bad roll pin in the eccentric. These are a few that come to mind right off the top.

Yes but that does not explain the buzzing sweep. I second checking the front wireway.

[Ted]

Sounds to me there is a bad connection on a neutral wire. Check all the C1 white wires, and inspect the terminal strip under the chassis for darkened insulation on a white wire.

[Tablejam]

Sounds to me there is a bad connection on a neutral wire. Check all the C1 white wires, and inspect the terminal strip under the chassis for darkened insulation on a white wire.

Yes there is one white wire on the far ten side that jumps two terminal strips, I believe the neutral for the entire machine runs through it.... I've had it cause strange voltage problems.

Also you mentioned you tried different chassis, did you also try a different MP board? When these go bad strange things can happen and might explain the simultaneous problem with spot and the buzzing sweep relay.

[felix]

A chattering solenoid would be the back control circuit breaker.

[8270tom]

Have upgraded the jumper between TS-1A1 and the other terminal strip for the neutral wires from 14 to 12 gauge. Had quite a few fried causing intermittent voltage drops.

[frosty 1]

Sounds like the shadow bowling curcuit, Ted , is it the gray wire on t2 transformer that takes that curcuit out?

[felix]

G-MAN C1

[PhilDawson]

Many thanks to all the advice, gotten home now, and Felix got it spot on, the Rear Control Circuit Breaker seems to be the issue, swapped it out, and ran it for 12 games without fault!

Again, thanks everyone!

[Tablejam]

Dang it! I mentioned the rear conreol breaker (as I've lost the spot solenoid before because of it) in another thread and was shot down, told 'it had nothing to do with the spot solenoid'..... I knew I was right.

Well that's good, you seem to have got it fixed.