Hi

First Step the disassembly of the loco

The opening is quiet easy. Just unscrew the 2 screws from the under side and remove the body. Be careful not do any damage to the sensitive plastic hand grasps.

And that is what is inside.



There is a big PCB on and the smaller reversing unit



Desolder everything and taking everything apart as well:



All the parts (except the body). Be careful with 4 stairs on the main module are very fragile!!!



The PCB is used for the change between hot shoe and photograph, to keep the capasitor of the motor, have the two contacts of the motor underneath, and the lines for the front lights.



The red plastic axle is for the changing between photograph and hot shoe from under the loco without the need to remove the body.



The motor is a DC three pole motor from Βühler the same with the one in the 3125 etc Red arrows.



Then I gone further with the opening and disassembly of the driving truck, so its possible to remove all the old hard grease, and clean very well everything.



The inspection did show any wear or damage. (the loco any way was working perfect in analog mode)



I did the same with the front truck witch is easier as the are no any gears.

So after the opening the cleaning of everything I reassemble the trucks as there is no need to lost something, with very careful use of high quality silicone grease.

Special care when change the traction tires as the bolts are very small and the all system of the wheels very sensitive. It's extremely difficult to find a spare part in case of any damage

Then I start the measurements and the thinking what to do....

I will come back after the weekend..

Regards

Costas

Edited by user 12 November 2018 11:06:34(UTC)  | Reason: Not specified

Sorry the hand grabs are metal, painted black the railings are plastic....
But there are on LokMuseum new ones for 3,80 €


Costas

Hi

Next it is the time to decide about the decoder.
There are two options according to my specifications:
1. 60972
2. 60982
Both are identical but differ in the packaging. The 60972 is a 21pin and the 60982 is plastic warped with 14 cables !!!!



The 60972 is to big (and thick) for the limited space above the PCB



So the decision is to use the smaller one the 60982. This packaging has some disadvantages: can not be removed easily to put another decoder and if you want program with the 60971 must use cables, witch is a bit complicated.



The dropping resistors for the LEDs will be soldered in a small vero board witch will seat where the reversing unit was.



I use classical 1kΩ resistors as there is enough space and are easier to handle than the SMD ones



So I will use the NEM color coding.

The decoder programmed with the 60971 device, for the motor parameters, functions, and from there I dim the LEDs to the desirable output as well, and the programming of the red LEDs, as well the cabin LEDs

Regards

Costas

Next I prepared the two cabin lights.

On two small vero boards just SMD WW LED 1206 size. The resistors are in the other vero board.



Glued in place with hot glue



So everything is ready for final assembly

Costas

Hi

And finally some pictures of the result:

White lights



Red taillights, No bleeding at all to the upper light



Cabin Lights



Thank very much all of you for your nice comments.

I hope that this conversion which is very special and not very easy will help other Märklin enthusiasts

Best Regards

Costas