Hello, all!


Not so long ago I had a problem with electronic reverse unit in my SBB 460 locomotive. After some time of using, I felt smell of burnt electronics so I opened it and found out that few diodes are burnt.

The problem is not that heavy as the locomotive runs and lights are fully operational. Still, if I continue to use it, there is possibility of burning the rest of electronics on reverse unit therefore I have one question for You: Does anyone know exact markings of the power transistor (if it is), diode or triac shown on the picture?

Diodes are 1N4002 and can be replaced with 1N4007 but that power transistor or whatever it is, is under question as I know nothing about it.

If anyone knows something about it, please let me know!

Thank You all in advance!

Best regards,
Digitaltrainshort

This is an analogue electronic reversing unit
This is one variation of the 4 variations that Marklin used over the years.
To find the problem is difficult.
You can see only the top side with conventional components
The bottom side is full of SMD components, so I thing that this circuit board is not repairable
The only way to solve the problem - as spares are not exist any more - is to find a module from somebody who has one left from a conversion

The best think to do is to change the motor and the circuit with a modern motor and digital decoder.
The cheap way is with the 60760 set, with a cost under 40 Euro.
The conversion is very easy. The only problem is the connection of the lights on the 622550 PCB where some changes needed.

But if you select this solution (digital conversion) we can give you advice for the lights. (Don't try to do if you don't know the swiss light changeover problems and variations in Marklin Locos

This beutifull loco will run better with the 5pole regulated motor and any way is worth to do.

Costas

Hello all!


I wonder could I use c80 decoder in this model perhaps?

Well, the things that had to be done is to replace decoder return wires with wires connected to the chassis so the lights can be operational, but, certainly, they will depend on how good is mass generally so flickering could be something expected.

Still, I think that it could be done with present motor. What is your opinion about this?

5 poll motor with its decoder is better option one way or another, but I just wonder could this be done with c80 decoder anyway?

Thank You all on your time and answers up in front!


Best regards,
digitaltrainshort


P. S. Thank You for providing pictures of the original DELTA/Digital model (which should be this one too but the boxes or model is switched!)

I am replacing all my c80, c81, 6090, DELTA etc with modern decoders at least fx and certainly DC motors, 5 pole in 99% of the cases.

I think that in these days anything else older than 5 pole and fx is good only for the bin!!!

Costas

Hello all!


Thank You on your answers! Yes, I understand what decoders are recommended and which ones you use to replace present ones.

However, sometimes, it can and is expensive, but it is just Ok!

I am using this opportunity to thank on the answers to Mike C, Costas, kiwi Alan...(sorry if I missed one of You!)

Thank You all once again!

Best regards and wishes,
digitaltrainshort