Joined: 02/12/2012(UTC) Posts: 12 Location: Cambridge
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My MAR 39353 sometimes fails to pick up any signal when I switch it on. It's just dead - no lights, nothing. If I can get it to start it runs perfectly and the functions all operate. The if I take it off the track and put it back, the whole thing is dead again. I've cleaned the wheels and slider and oiled it as per the instructions and tried fiddling with the addresses. Does anyone have any suggestions?
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 1 user liked this useful post by PeterCambridge
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Joined: 10/02/2021(UTC) Posts: 3,965 Location: Michigan, Troy
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It's a C sine motor. Mine is not. It's the DB museum version. I have a Taurus with a C sine motor and until it's warmed up, it runs sporadic. Always has. When I nudge it from the sides it usually takes off again. This only happens when it hasn't been run in a long time. If only a day or two it runs perfect even cold.
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Joined: 04/02/2011(UTC) Posts: 3,584 Location: Paris, France
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Hi Peter Your loco was designed in 2003, has a full size Sinus motor and a separate simplified sound module (I thinki). The slider (Ski) is clipsed.
From what you describe it looks like a current pickup issue I would check the following things: - make sure the slider is straight and totally clean not only on the sliding surface but also between the spring blade and the ski itself I experienced sometimes issues there on older sliders. A bath in Noch RS24 may help (contact fluid is also OK). - make sure the ski base is fully home and not partly clipsed thus causing bad contacts - check the contact between each wheelset and the frame / decoder. Upside down on a foam bed, alligator clip on the slider bringing B and a loose wire bringing the O used to check each ground point (each wheel). If bad contacts there: a tiny drop of Märklin oil on each side of each axle, let the loco run for a while and wipe excess oil - on older locos sometime one wire attached to moving parts like bogies, may be almost broken
On these locos in those years, often only one bogie was connected to ground while the other one was relying on metal to metal connection. An additional grounding of the ungrounded bogie may help using thin and flexible wire (similar to those wires with Märklin mLD3 / mSD3 decoders.
Cheers and bonne chance with your repair Jean |
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 1 user liked this useful post by JohnjeanB
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Joined: 05/12/2008(UTC) Posts: 1,811 Location: Crozet, Virginia
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Originally Posted by: JohnjeanB  Hi Peter On these locos in those years, often only one bogie was connected to ground while the other one was relying on metal to metal connection. An additional grounding of the ungrounded bogie may help using thin and flexible wire (similar to those wires with Märklin mLD3 / mSD3 decoders.
Cheers and bonne chance with your repair Jean Good advice as always from Jean! When running down a current problem I often find it in the return side rather than the supply, and extra ground points can never hurt anything. |
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. |
 3 users liked this useful post by dickinsonj
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Joined: 02/12/2012(UTC) Posts: 12 Location: Cambridge
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Many thanks, Jean. I'll try your suggestions.
Peter
From what you describe it looks like a current pickup issue I would check the following things: - make sure the slider is straight and totally clean not only on the sliding surface but also between the spring blade and the ski itself I experienced sometimes issues there on older sliders. A bath in Noch RS24 may help (contact fluid is also OK). - make sure the ski base is fully home and not partly clipsed thus causing bad contacts - check the contact between each wheelset and the frame / decoder. Upside down on a foam bed, alligator clip on the slider bringing B and a loose wire bringing the O used to check each ground point (each wheel). If bad contacts there: a tiny drop of Märklin oil on each side of each axle, let the loco run for a while and wipe excess oil - on older locos sometime one wire attached to moving parts like bogies, may be almost broken
On these locos in those years, often only one bogie was connected to ground while the other one was relying on metal to metal connection. An additional grounding of the ungrounded bogie may help using thin and flexible wire (similar to those wires with Märklin mLD3 / mSD3 decoders.
Cheers and bonne chance with your repair Jean
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