K Line F7 A-B-A Smoke Help

I recently was working on a K-Line A-A with two smoke units.  The trailing A unit has a switching semiconductor (didn't check exact number) to switch the power to the smoke.

The primary smoke control will come from the R2LC, and the smoke unit in the master unit will be supplied directly from that output.  If that smoke unit is not working, my guess would be the R2LC smoke triac has died.

If by chance they are trying to power all three smoke units from the R2LC smoke triac, it would explain why it died, as they simply don't have that kind of power handling capability without a heatsink.  I'd just work with the lead A unit and get it's smoke working first.

The reset code of 8 works for my A-A K-Line.

A friend of mine had a set of those in SP. It stopped working and he sent it back to K-Line under warranty. This happened twice. According to my friend, the K-Line service rep told him that the smoke units were overloading the electronics and he should leave the smoke turned off. Now, my friend knows zero about electronics, so he couldn't tell me what it was that was being overloaded. He just said the K-Line rep told him that the electronics were not designed for the load of three smoke units. This was a total shutdown of the unit, not just a smoke failure. I'm just passing this along FYI as I have no further information. 

Based on that information, I'd say that model may have been wired all into the R2LC, and it would indeed cook the triac in fairly short order.  I suspect that's why the A-A that I have had separate switching for the second smoke unit.

This can be fixed, but it'll take a little work.   I'd probably suggest rewiring so that the R2LC drives the smoke unit in the front unit, and use a small relay off the smoke unit power to feed the other two track power that is half-wave rectified by a 3A diode, that's the same voltage as the R2LC puts out.  This would probably be a fairly simple fix, assuming that it really is trying to drive all of them from the single smoke output.