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Question Marklin 3075: from digital to analog
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Offline philippe99  
#1 Posted : 09 August 2025 17:55:09(UTC)
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philippe99

Belgium   
Joined: 09/02/2025(UTC)
Posts: 22
Location: Liege
Hello
I bought a used 3075.
Contrary to the ad, the machine was in poor condition (a missing bogie, etc.).. but I have parts to repair.
When I opened the machine, I saw that it had been digitized.
IMG_1057.jpg
I wondered...
To switch it from digital to analog, isn't it enough to set all the switches to zero?
There are four switches: two are already set to zero, and the other two are set to 1 (the positions range from 0 to 2).
Of course, there is no documentation.
NB: I don't have any other photo besides this one... which I used for the dispute... as the machine is being shipped back to me (the seller refused to take it back).
Thx
Phil
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Offline cintrans  
#2 Posted : 09 August 2025 19:56:55(UTC)
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cintrans

Aruba   
Joined: 11/07/2018(UTC)
Posts: 233
Location: Aruba (general), Oranjestad
Phil

That lok is a #3021 (V200), not a #3075 (BR216)
It has what seems to be a Delta decoder
Yes, switching all the switches to 0 will make it drive in analog mode

Best regards
Jean-Pierre
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Offline philippe99  
#3 Posted : 09 August 2025 21:28:32(UTC)
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philippe99

Belgium   
Joined: 09/02/2025(UTC)
Posts: 22
Location: Liege
Originally Posted by: cintrans Go to Quoted Post
Phil

That lok is a #3021 (V200), not a #3075 (BR216)
It has what seems to be a Delta decoder
Yes, switching all the switches to 0 will make it drive in analog mode

Best regards
Jean-Pierre


Yes, you're right is a V200. I always make a mistake with my BR216 I also own.
Tx. will lower all the switches to enable analog
Phi
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Offline kiwiAlan  
#4 Posted : 09 August 2025 23:53:28(UTC)
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kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 8,561
Location: ENGLAND, Didcot
Originally Posted by: philippe99 Go to Quoted Post
Originally Posted by: cintrans Go to Quoted Post
Phil

That lok is a #3021 (V200), not a #3075 (BR216)
It has what seems to be a Delta decoder
Yes, switching all the switches to 0 will make it drive in analog mode

Best regards
Jean-Pierre


Yes, you're right is a V200. I always make a mistake with my BR216 I also own.
Tx. will lower all the switches to enable analog
Phi


As the decoder has only four switches it is an early Delta decoder - not the earliest version which had solder jumpers to set the address, but the next generation that came out after Marklin decided not to use the automatic analogue mode sensing that they were in dispute with the patent holders.
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Offline Benders  
#5 Posted : 12 October 2025 06:38:33(UTC)
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Benders

New Zealand   
Joined: 11/05/2020(UTC)
Posts: 11
Location: Wellington
I have a similar problem with a 3066 loco. It has a Delta? decoder with 4 switches ( either 0 or 1 ). I only run analogue locos via traditional transformers and thus cannot set/change settings. The loco is extremely slow and I want to increase its speed - have tried toggling the switches to no avail. I am about to remove the decoder and replace with a reversing unit. Before I do this is there some solution other solution that I could use?
Thanks
Benders
IMG_3368.jpg
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Offline mvd71  
#6 Posted : 12 October 2025 06:59:44(UTC)
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mvd71

New Zealand   
Joined: 09/08/2008(UTC)
Posts: 1,955
Location: Auckland,
Originally Posted by: Benders Go to Quoted Post
I have a similar problem with a 3066 loco. It has a Delta? decoder with 4 switches ( either 0 or 1 ). I only run analogue locos via traditional transformers and thus cannot set/change settings. The loco is extremely slow and I want to increase its speed - have tried toggling the switches to no avail. I am about to remove the decoder and replace with a reversing unit. Before I do this is there some solution other solution that I could use?
Thanks
Benders
IMG_3368.jpg


The slow running will not be a result of the delta decoder, if anything it should be better than an analogue reverser as it consumes less power. You problem most likely comes from a motor and gear train in need of servicing.
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Offline Benders  
#7 Posted : 12 October 2025 11:45:05(UTC)
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Benders

New Zealand   
Joined: 11/05/2020(UTC)
Posts: 11
Location: Wellington
Thanks for the reply.
The motor has been overhauled and the gears cleaned. The wheels turn freely when when pushed along a surface or the tracks.
I have the 3067 loco which is identical except is has a superbly functioning reversing unit, and moves at a fast clip.
I don't have much faith in decoders as I have similar slow speed rates with other decoder locos.
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Offline marklin81  
#8 Posted : 13 October 2025 03:10:53(UTC)
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marklin81

United States   
Joined: 19/03/2015(UTC)
Posts: 41
Location: Virginia
Originally Posted by: Benders Go to Quoted Post
The wheels turn freely when when pushed along a surface or the tracks.


The wheels on a locomotive should not turn freely when pushed. That may be an indication of the problem. It could be that the wheels are slipping on the axles.
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Offline mvd71  
#9 Posted : 13 October 2025 21:20:59(UTC)
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mvd71

New Zealand   
Joined: 09/08/2008(UTC)
Posts: 1,955
Location: Auckland,
Originally Posted by: Benders Go to Quoted Post
Thanks for the reply.
The motor has been overhauled and the gears cleaned. The wheels turn freely when when pushed along a surface or the tracks.
I have the 3067 loco which is identical except is has a superbly functioning reversing unit, and moves at a fast clip.
I don't have much faith in decoders as I have similar slow speed rates with other decoder locos.


When you say overhauled what do you mean by that? I am guessing you mean it was taken apart, cleaned, lubed, and reassembled?

An overhaul would include replacing worn gears etc…. And the wear on the gears can require close inspection to see. Once the gears begin getting worn they will become inefficient and reduce the performance of the loco. My experience has been that a loco that is needing overhaul will usually be slow running, and often noticeably different in performance in each direction. How is yours performing in the other direction?
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