I have a year old PS-3 diesel unit that was operating on my clubs Lionel Legacy layout just fine.  Suddenly, it only goes in reverse at full speed on the layout.  I brought it home, reset it through my DCS system, brought it back to the club and the problem persists.  As soon as I apply power to the track it takes off, full speed, in reverse.  Nothing has changed on our layout, no cable switching or electrical monkeying around.  Any thoughts?

Original Post
Basil posted:

I have a year old PS-3 diesel unit that was operating on my clubs Lionel Legacy layout just fine.  Suddenly, it only goes in reverse at full speed on the layout.  I brought it home, reset it through my DCS system, brought it back to the club and the problem persists.  As soon as I apply power to the track it takes off, full speed, in reverse.  Nothing has changed on our layout, no cable switching or electrical monkeying around.  Any thoughts?

Sound to me like a faulty tach reader although I have not worked on an MTH in a while I seem to remember a bad tach causing an issue like this.

Shawn Chronister

Bad tach does not make it go in reverse like that.  But the question is good.  Does it work right with your DCS.  Does it work in conventional on your track?

If engine always runs in reverse at full speed even after conventional and DCS resets, could be a shorted motor fet.  G

MTH Authorized Service Center

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Thanks for the replies, Gents!  It functioned normally after a factory reset on my test track.  I have not reset it again since bringing it home Wednesday, but will get to it this evening.  The last time, though, it started in idle and responded appropriately to all commands I gave it through the remote.

Basil

I forgot to add, this is not the only engine this is occurring with.  I have another PS-3 diesel engine that did the same.  I didn't bring it to the club to test it on Wednesday after its factory reset. However, after a factory reset at home, it too functioned as normal on the test track.  I won't get it back to the club until next Wednesday, though.

I got the GP 40 on my test track and it operated perfectly in PS3.  I switched it to conventional via the remote and it instantly went in reverse.  Does this mean it's merely locked in reverse in conventional?  Also, I don't know how to do a "conventional reset" as the remote only gives me "Feature" and "Factory".

Engineer-Joe posted:

Conventional reset No dcs signal just bell and whistle buttons.

One whistle followed by 5 bell presses

2 horn sounds after the above means the reset took. If not you have to try again until you get the proper 1/2 second timing.

I admit I'm being lazy in that I haven't taken out the 4k yet, but I did do a feature reset with the remote and the CW-80. When I switched the loco over to conventional it went forward. I take that as a postive sign. Now I'll do the same to the other loco that was doing this and test them both on Wednesday at the club. Fingers crossed!

Sometimes using a Lionel cw80 will scramble an engine like this I've read.

A conventional reset is done with no signal present. So you can't use the remote. 

I love to use Stans video to show how it's done. It's easiest with the Z4000 for me.

" on Sour mash and cheap wine " ??

Why go back to DCC when I have DCS!

My brand new at the time, ps3  Sd80mac got locked in reverse by dcs in a lashup. It was fixed with a conventional reset like Stans video. I bought another engine back then and that one needed a reset right out of the box.

" on Sour mash and cheap wine " ??

Why go back to DCC when I have DCS!

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