Joined: 09/12/2010(UTC)
Posts: 36
Location: norway
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Hi, just picked up a nice 3611 steam loco. But it’s acting weird: it’s only going forwards! The lights reverse properly but the motor only seems to want to go one way. Any idea on what could be wrong?
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 Joined: 22/01/2009(UTC) Posts: 14,875 Location: On 1965 Märklin Boulevard just around from Roco Square
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most probably one wire came off |
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 1 user liked this useful post by river6109
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 Joined: 04/02/2011(UTC) Posts: 3,559 Location: Paris, France
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Originally Posted by: Kaspar  Hi, just picked up a nice 3611 steam loco. But it’s acting weird: it’s only going forwards! The lights reverse properly but the motor only seems to want to go one way. Any idea on what could be wrong? Hi Kaspar I have the very same loco with a "Glockenanker" Bell-shaped armature. Runs smoothly and silently So your motor turns only in one direction and here are the possibilities - the motor brushes are worn in one direction and need a bit hep when reversing at start - to be sure the motor is not faulty, disconnect it and apply a DC voltage (5 V to 10 V, possibly using a 9 V battery. Check both directions - no wire could be involved otherwise the motor won't run at all. - one of the driving transistors in the decoder is fried (there are 4 of them in a H arrangement to control the speed and direction If none of the above is working then a change of decoder is needed. Why not have a mSD3 BUT: - you need to change the ski as the original one has a long bar clipsing directly into the decoder - you need to check where the resistors of the LED headlights are located - NEVER EVER unplug or plug the LEDs while the loco is power ON at it will SURELY destroy them. Cheers Jean |
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1 user liked this useful post by JohnjeanB
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 Joined: 28/11/2007(UTC) Posts: 8,226 Location: Montreal, QC
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First question: You say that the lights work properly when reversed. What does the locomotive do? Does it keep running in the same direction or does it stand still until the locomotive is reversed again? The locomotive has a DC Faulhaber motor. The motor is connected to the decoder by two wires. So, we can eliminate the wires as the model does run. I don't know how the brushes work in this model, so you can refer to Jean's post for that. https://www.maerklin-sam...iven/03611/03611_mlb.htmIf you can locate the output terminals on the PC board/decoder, you should be able to test whether it is outputting power voltage in the correct sense for each direction.  I don't know what decoder replacement would involve as this model (like a few others) is not the same as the standard Maerklin model. Regards Mike C
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1 user liked this useful post by mike c
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 Joined: 10/02/2021(UTC) Posts: 3,887 Location: Michigan, Troy
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I didn't convert my 3511 myself.I suspect that only difference from a 3611 is the 5 Star motor regulation and the two potentiometers for acceleration delay and maximum speed. It's a gut job to upgrade. Mine was converted before the sound decoders were available, so it's a 60901. If I were doing one today, I would use an msds or MFX wired type.I don't think the tender has room for a plugin PCB board. Even the old decoder is a tight fit with all the wires.
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 Joined: 01/05/2016(UTC) Posts: 623 Location: Athens
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4 users liked this useful post by ktsolias
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Joined: 01/05/2016(UTC) Posts: 623 Location: Athens
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1 user liked this useful post by ktsolias
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Joined: 25/09/2006(UTC) Posts: 945 Location: Sydney, NSW
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Hi Kaspar, The decoders in the original Lady C locomotive are known to fail. I think you would be better upgrading the decoder to provide improved load regulation and add other features such as cabin light and rear Telex coupler. At the time when my decoders failed I used LP3 and LP4 decoders but today I would use a LP5 which is a very good decoder. I have documented my decoder upgrade of the Lady C with the article below which you may find useful to provide insight what is required. 3611 Decoder UpgradeOriginally Posted by: Kaspar Hi, just picked up a nice 3611 steam loco. But it’s acting weird: it’s only going forwards! The lights reverse properly but the motor only seems to want to go one way. Any idea on what could be wrong? |
Ross
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2 users liked this useful post by Ross
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Joined: 05/12/2008(UTC) Posts: 1,801 Location: Crozet, Virginia
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Good advice all around. I also used a Luessi board in my 3611 and an ESU decoder after the original decoder failed.
Modern electronics and that beautiful motor are a great combination and a nice upgrade to a steam era icon. |
Regards,
Jim
I have almost all Märklin and mostly HO, although I do have a small number of Z gauge trains!
So many trains and so little time. |
1 user liked this useful post by dickinsonj
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Joined: 12/08/2006(UTC)
Posts: 9,275
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Faulhaber motor is a self-supporting skew-wound copper coil motor.
If the reverse drive does not respond it´s PCP decoder fault. |
H0
DCC = Digital Command Control
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Joined: 09/12/2010(UTC)
Posts: 36
Location: norway
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First off, thank you all for great responses, this forum is such a valuable resource for Märklinists. To answer your question Mike, the engine operates as expected in forward. In reverse it switches lights but still runs forward. So basically it always moves forward. From the information given here I’m guessing the decoder is not reversing the voltage sent to the motor, will try to test the output voltage. Originally Posted by: mike c First question: You say that the lights work properly when reversed. What does the locomotive do? Does it keep running in the same direction or does it stand still until the locomotive is reversed again? The locomotive has a DC Faulhaber motor. The motor is connected to the decoder by two wires. So, we can eliminate the wires as the model does run. I don't know how the brushes work in this model, so you can refer to Jean's post for th https://www.maerklin-sam...iven/03611/03611_mlb.htmIf you can locate the output terminals on the PC board/decoder, you should be able to test whether it is outputting power voltage in the correct sense for each direction. I don't know what decoder replacement would involve as this model (like a few others) is not the same as the standard Maerklin model. Regards Mike C
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1 user liked this useful post by Kaspar
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Joined: 12/08/2006(UTC)
Posts: 9,275
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H0
DCC = Digital Command Control
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