LGB 26841 Saxon Meyer circuit board

idlemarvel

idlemarvel

Neither idle nor a marvel
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I think I need a new circuit board for my Meyer. I had fitted a Massoth XL decoder to the loco which comes as DC with a 10-pin interface. It had a hissy fit a few months back when it started lurching forward by itself. It would sit quietly for about 30 seconds then suddenly move a few millimeters, then another short time and lurch again. It would do this endlessly. Weird. I tried it with the blanking plug refitted in DC mode and it worked okay, so I assumed it must be the decoder had gone phut. I had recently reprogrammed it on a programming track with one half of the loco accidentally on live track, that usually does for any decoder. I have just got round to fitting a new XL decoder and sadly the lurching problem is still there. No other locos have this problem and I have plenty with XL decoders so it's nothing to do with my general layout setup. I have stripped down the loco to bare essentials, just chassis, motors, circuit board and decoder, no lights, so I am assuming it must be something wrong with the circuit board, maybe some capacitor is shorting and charging/discharging. Unfortunately the circuit board does not have a part number on the exploded parts diagram and I can't find anything on modell-land or champex-linden so I am hoping somebody on here might have a spare one or know where I can buy one. I could rewire the loco myself if necessary but it would be quite a bit of time and effort. Any ideas anyone? Thanks, Dave
 
Are you *sure* it is just not out of quarter? - Lurching tends to be motion-related.

I would give the motion a good hard looking at.
Possibly, even remove the rods and try it??

In my early days, I stripped things out, but did not label them. :shake::rolleyes:
If you can post a photo of the board, I can have a rummage..
 
Thanks Phil. I am sure it is electrical as I can hear the motors firing when it lurches. I will post a picture of the board tomorrow.
 
I think Phil could be correct. LGB Motor Blocks can sometimes get out of sync in that 1 of the wheels will slip on the gear cogs thus putting the quartering out. Very likely that has happened with your beastie, quite likely on the rear set and this is not easy to see due to the outside frame. This can and will cause jerky running if out by mire than a few cogs.

This can be caused by heavy loads and slipping on severe gradients. If you recognize either of these then you have possibly found your cause. Though improperly secured Chassis Wheel Keepers could also be responsible.

Though re reading your original post you say it runs ok on the original analogue board (DC). Wierd.
JonD
 
Other thing that comes to mind..
If one motor is very 'tired', it could be pulling enough current to cause the decoder to protect itself??

I would run on analogue, with an ammeter in circuit, to see just how much current it is using. - I run everything that comes onto the bench analogue before I start.. Can show if there are any problems not of your making.
 
Thanks Jon and Phil for your comments. I will post a short video clip of what is happening, I am sure when you see it you will agree it is not mechanical. Also below a picture of top and bottom of circuit board. I've just noticed what might be a part number 130039.

Video clip; about 20 seconds long, nothing happens for 15 seconds. I just placed the loco on live track, did not touch the controller.


2017-05-19 09.31.40.jpg

2017-05-19 09.31.14.jpg
 
Ah, had misunderstood.. Thought it was during motion it had a lurch..

It does look 'electrical'.

Cheapest option would be to cut the ends off, and wire directly into the decoder..

Easier, but costs, would be to use a Massoth 8150701 DCC Onboard Adapter. - Which you would just plug the connectors from your original board into.
You would need to watch divider settings for lights etc.
 
Good find Arthur, that looks the job. And only EUR 14.90.
I'd like to know how you found it as I searched modell-land to no avail.
Maybe your German is better than mine (not difficult).

Thanks for the other idea Phil.

I love this forum, there's always someone who knows and just as important, willing to impart their knowledge.

Thanks, Dave
 
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