Anyone have a source for working LT-5 slave boards and/or sensor boards inside of the motor?

My LT-5 is acting wacky and it would be nice to have a known working set to compare against and narrow down the problem.

Looking for bracket 01-13175 if anyone happens to have one laying around...

LT5Bracket (resized).jpg

Thanks. Anyone specialize in repairing these game-specific boards?

Here's what I know:

1) Motor fails self test:

2) Motor can move left and right and center itself, but it moves with a jerky/unstable motion.
3) Reading 2.4VDC to 2.6VDC from hall effect sensor (extreme left to extreme right) as measured at input on slave board.
4) Extreme left/right optos are working correctly.
5) When in attract mode, the coils on one of the sides sometimes will be energized (should always be disabled in attract mode)
6) When LT-5 is *disabled* in settings, coils still get energized (should be disabled) ... After I noticed this I unplugged the coils from the slave board to prevent them from getting burnt out (they were running extremely hot...hurt to touch and I started to smell a hot/burning plastic smell).

So at a minimum, the circuitry related to enable/disable state isn't working correctly. Perhaps this is contributing to the jerky motion. My understanding is that the master board itself handles this and actually sends the 20VDC (or is it 12VDC?) for driving the coils over the ribbon cable (but there's also a DAC on the slave board???). I.e., when disabled the master board should NOT be sending 20VDC over the ribbon cable. But perhaps I've misunderstood the documentation that's out there. I need to spend some time looking over the schematics and re-reading the doc that's out there so that I have a fuller understanding of what's going on.

I'm not necessarily measuring anything wrong with the sensors themselves, but I'm not sure what VDC range I should be reading from the hall effects sensor as measured at the header on the slave board.

As a first step I've ordered new ribbon cables (CPU -> master board and master board -> slave board) just to rule out any weird issues there. The master -> slave board ribbon cable was badly pinched at one time.

Thanks for the insights/clarifications. The new ribbon cables are coming in today, so I should be able to drill in some more this weekend.

P.S. That's great detail you have there and well beyond what I've read elsewhere so far. Is this written down/formally documented anywhere?

Ribbon cables came in. I accidentally ordered the wrong length ribbon cable for the CPU -> master connection, so I was only able to replace the master -> slave board ribbon cable.

The motor now will randomly pass self tests in a "sloppy" manner. Basically it gets wobbly/shaky as it rotates clockwise past the 90 degree position. I didn't get a chance to debug further yet.

Could you share the link? Perhaps I can use Google translate to glean some useful information.

Non LT-5 question: I'm finding the skid pad ramp (ramp shot from upper flipper) hard to hit. E.g., if the ball is served up from the LT-5 lock or kickback, it only makes it all the way up the ramp maybe 1 out of 10 times (and even then it *barely* makes it). If, however, I hit the inner loop or right orbit solid and hit the ramp then I make it more like 7/10 times. (This is if my shot is solid on the ramp.)

I did a full flipper rebuild, even replacing the coil as the old one was bad, so the mechanically the flipper is solid. I did notice, however, that the flipper was using a red sleeve coil...

...Is red the correct coil for the upper flipper, or should it be blue?

Note 1: One other variable is that the right side of the ramp is sightly deformed (apparently melted by bulb in the past). I found a pinsider that has a spare ramp, so I can try eliminate that as a potential cause once installed. It doesn't seem like the deformation should impact the ball motion *that* much, but maybe the engineered design is that the flipper has just barely enough power to make the ramp when the ramp is perfect.

Note 2: I've noticed a good half of the time, balls served up by the LT-5 lock or kickback tend to bounce around a bit, and not cleanly roll over the flipper, so that may be impacting power, too. Anyone have a fix/mitigation for that?

Thanks for the link!

Good call on the coil wiring. I see on the bottom of mine that someone wrote in with sharpie at one time to label coil locations...So it's possible someone had it pulled apart to that degree and messed up when putting it back together.

See this is out of stock. Still making these?

Oh my. What's the story on this one?

Crazy. How bad is the cabinet? Any guess how long it sat outside?

Glad you are able to save it. Wild that someone would put it outside and exposed.