Marklin 7186 Motor Not Engaging - Solenoid fires but the motor doesnt kick in Share  Email this topic  LinkBack Topic URL  Retweet this Topic  Share Topic on Google+  Like this Topic  Share on Facebook  Digg this Topic  Reddit this Topic  Share on Tumblr Options  Watch this topic  Print this topic View » Normal Threaded

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airborne7395		#1 Posted : 13 December 2020 16:00:45(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		I have been working this problem for several days with help from some good guys and an electrician, but I have run into a blank wall. The turntable contacts, brushes, and everything have been cleaned. The controller is plugged in correctly, and works. Here is the problem the best I can describe it: if I push a button or the manual lever, the direction solenoid kicks in but the motor does not. If I reach over and give the exposed gear a nudge, the motor then fires and the bridge moves perfectly to the next position. In other words, if I don't put the house back on the bridge, I can run the turntable with a hands on approach. I would rather use the controller. Has anyone ever encountered this problem before? Thanks!!
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Crazy Harry		#2 Posted : 13 December 2020 22:34:01(UTC) Retweet
Joined: 18/11/2008(UTC) Posts: 477 Location: Oakville, Ontario		I think your problem is the brushes are not contacting the rotor properly, the springs are not exerting enough pressure on the brushes. A simple test is to lightly push on the brushes with a toothpick once the solenoid has been actuated, if it starts then the spring pressure is too weak or more likely the brushes are worn. Have you inspected the brushes or replaced them with a new set? Maybe the motor needs a cleaning, the collector may be dirty. Here's a video on how to do it for locomotives, but the turntable motor is similar in design (the relevant part for these older motors starts at the 6:50 mark of the video): Cleaning and Maintenance for Marklin Motors. Hope this helps, Harold.
1 user liked this useful post by Crazy Harry		airborne7395
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JohnjeanB		#3 Posted : 13 December 2020 22:58:02(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,135 Location: Paris, France		Originally Posted by: airborne7395 I have been working this problem for several days with help from some good guys and an electrician, but I have run into a blank wall. The turntable contacts, brushes, and everything have been cleaned. The controller is plugged in correctly, and works. Here is the problem the best I can describe it: if I push a button or the manual lever, the direction solenoid kicks in but the motor does not. If I reach over and give the exposed gear a nudge, the motor then fires and the bridge moves perfectly to the next position. In other words, if I don't put the house back on the bridge, I can run the turntable with a hands on approach. I would rather use the controller. Has anyone ever encountered this problem before? Thanks!! Hi and welcome to the forum. If the motor does turn when the solenoid is activated or the manual buuton is pushed sideways there may be 2 causes: * the adjustable contact to get the motor started is improperly adjusted * as Harold mentions the brushes may be missing or bad Note: under the bridge there is a sheet-metal part that is a "feeler" It senses when the bridge has reached a track. When it does 2 things happen * the motor stops rotating in the pre-selected direction * a finger forces a brutal stop on the horizontal shaft, just after the clutch Read post #2 of this https://www.marklin-users.net/fo...ts/t43516-7186-Turntable where you may download of the exploded view Here it is for you 7186_explo.pdf (187kb) downloaded 12 time(s). Here is my 7186 open in operation Cheers Jean
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Borsig-Werke		#4 Posted : 14 December 2020 12:17:11(UTC) Retweet
Joined: 09/09/2020(UTC) Posts: 66 Location: Uusimaa, Helsinki		I just recently had this issue with my 7186 TT. What I did was cleaning motor, checking brushes and then what the real issue was probably were solder joints in red and black wires as they were coming loose when I opened motor. I have rounded those with red pen below. After doing before mentioned steps, TT is working flawlessly
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airborne7395		#5 Posted : 14 December 2020 12:20:39(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		Thank you for replying!The brushes are brand new, and I dismanteled the entire motor and cleaned it and the armature. I have cleaned all the contacts. I reassembled the entire unit and still have the exact same problem. It runs if I give the exposed gear a slight push. I am stumped.
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Borsig-Werke		#6 Posted : 14 December 2020 12:21:40(UTC) Retweet
Joined: 09/09/2020(UTC) Posts: 66 Location: Uusimaa, Helsinki		did you check those solder joints properly I posted above? That red wire might come also loose from other end, underside the board.
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airborne7395		#7 Posted : 14 December 2020 12:27:10(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		The red wire had a bad solder connection, so I resoldered it. The black one looks fine.....
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Borsig-Werke		#8 Posted : 14 December 2020 12:28:00(UTC) Retweet
Joined: 09/09/2020(UTC) Posts: 66 Location: Uusimaa, Helsinki		Mine looked also fine, but they were not! (Test and measure) and better to resolder everything than assume something?
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airborne7395		#9 Posted : 14 December 2020 13:15:07(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		The brushes are new but I did apply pressure to them with a toothpick with no different results. All the solder joints seems strong now. It is odd that as soon as I give the gear a push, it runs perfectly.
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Borsig-Werke		#10 Posted : 14 December 2020 13:47:29(UTC) Retweet
Joined: 09/09/2020(UTC) Posts: 66 Location: Uusimaa, Helsinki		Hmmm... where exactly do you push and towards what? Picture could clarify a lot
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airborne7395		#11 Posted : 14 December 2020 14:08:39(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		I did resolder the red wire. I am really bad at soldering and probably dont have the best iron, and these are small fine wires,,,,,
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airborne7395		#12 Posted : 14 December 2020 14:10:53(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		See the round gear on the right? If I give that a nudge, the table turns properly.
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kiwiAlan		#13 Posted : 14 December 2020 14:11:13(UTC) Retweet
Joined: 23/07/2014(UTC) Posts: 8,109 Location: ENGLAND, Didcot		Originally Posted by: airborne7395 I did resolder the red wire. I am really bad at soldering and probably dont have the best iron, and these are small fine wires,,,,, This sounds like the armature may have a faulty winding, and once the motor is turning the other two windings provide enough power to keep it going.
2 users liked this useful post by kiwiAlan		DaleSchultz, dickinsonj
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airborne7395		#14 Posted : 14 December 2020 14:15:52(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		My problem is this: Ive had 5-6 guys giving me advice, and an electrician has looked at it. No one has ever had this problem, which is frustrating to me. Its not like it doesnt work, because it does, but not from the controller. If I hit the controller button, the magnet fires and direction is sent, but the motor doesnt engage. If I give the gear a slight nudge, the motor fires and runs perfectly. Again, my problem is, no one seems to ever had this problem, and I am checking and rechecking things without any different results. Frankly, I think the resistor is shot and not holding/sending a charge to the motor after the initial magnet/direction is set.
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airborne7395		#15 Posted : 14 December 2020 14:18:16(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		KiwiAlan, that is whole new thought. No one has suggested this, and I would never have thought it, considering the minimum amount of usage the turntable has had. I can tell you, I am NO GOOD at rewinding armatures.
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Borsig-Werke		#16 Posted : 14 December 2020 14:24:03(UTC) Retweet
Joined: 09/09/2020(UTC) Posts: 66 Location: Uusimaa, Helsinki		Originally Posted by: airborne7395 Frankly, I think the resistor is shot and not holding/sending a charge to the motor after the initial magnet/direction is set. You mean capacitors, why not just change them? Measuring is also possible, but it is very cheap to change those
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airborne7395		#17 Posted : 14 December 2020 16:37:42(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		Borsig, sorry for not answering right away but the REPLY button dissappeared!!! You are correct, capacitor. In the meantime, I got a partial wiring diagram. What I think is bad is the blue item closest to the magnet. It is called the "Marklin Blue Control Box". Further along is "Latch Solenoid" and part of the description says "...the latch is withdrawn and starts the TT motor".
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airborne7395		#18 Posted : 14 December 2020 17:02:47(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		Thank you JohnjeanB for the pdf document. Pretty handy with the parts numbers. If I could read German, it would be a bit easier, but I think I can use my translator and figure it out!
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airborne7395		#19 Posted : 14 December 2020 17:55:46(UTC) Retweet
Joined: 04/06/2014(UTC) Posts: 15		OK guys, it seems to be working, half assed. Someone pointed out a broken wire on the armature. I soldered it and fired the TT back up. It ran through clouds of smoke!!! Hahahahahahah!!! I wonder how long this is going to last? Time to start looking for a replacement. THANKS FOR EVERYBODYS HELP!!!!!
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