I have a non-working left outlane save gate on my Future Spa. In short, it's unresponsive during solenoid tests, but activates when grounding Q17. Here's some details...

-Yes, the gate is in the correct position; vertical (two inlanes when the solenoid is activated); swings clockwise (for two outlanes) when idle.
-Checked the SDB as mentioned above. And even swapped in another SDB to verify. No change.
-Swapped MPUs (I have two Ultimate MPUs by Alltek). No change.
-Checked continuity between A3J4-11 on the SBD, and A4J4-5 at the MPU - All good.

I'm stumped ... help appreciated.

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Thanks for chiming in. I checked the diode and it was ok. Replaced anyhow.

I’m going to try and trace things out with a logic probe. I’ll check back in.

They look clean and solid. I’ll double check my diags on the lines, and replace if there’s any doubt. Thanks for the 2-cents.

Brian

I don't appear to get any signalling from the CPU to trigger the solenoid. I'm a bit lost on the schematics here. Tracing back from the solenoid, I have J5-7 to Q17 preceded by the low voltage (5v) transistor. I don't have any low or high reading with a logic probe. J4-11 cross-connects to the MPU. I'm used to seeing a decoder chip before the solenoids, but none is noted (or so I can see) on the schematic.

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Whoops ... yeah, got ahead of myself with the screen snippets and circled the wrong set. Thanks.

Thanks! I’ll dig deeper tomorrow.

Alright ... I tried several times over now, but no luck.

I looked for signaling on the MPU, grabbed 5v off of TP6, and probed the pin on U11 for PB4 (and all the other continuous solenoid data lines). No change. PB4 reads low on the logic probe.

I also tried switching all option DIP switches to their opposite values (just in case) ... no change.

Gate solenoid still fires when Q17 is grounded.

All lines buzz out ... SDB to solenoid, and SDB to MPU.

I’ve tried TWO Alltek ultimate MPUs, and the original MPU. No change.

I’m patient ... but getting frustrated.

Any additional help greatly appreciated.
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ok, it’s fixed!

I was probing the wrong pins. Located the right pins on the PIA and they changed as they should. Traced back to J4-5 and found a broken .100 connector. I should have listened to you the first time when you said to re-pin the connector.

Thanks for sticking in there with me. If you’re ever in Asbury Park please let me buy you a beer and/or a day pass to the Silverball Museum. Sincerely, thanks!

Brian