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Offline Hackcell  
#1 Posted : 31 August 2014 09:16:25(UTC)
Hackcell

Costa Rica   
Joined: 21/11/2013(UTC)
Posts: 521
Hello,

I was wondering if somebody can help me understanding how the z scale loco PCB takes current from the tracks. It seems one pole reaches the PCB using the screw that creates a contact between the housing and the PCB, but what about the other pole? Checking the PCB, the inputs at the sides are linked to the screw line thru the wiring seen at the left.

I don't have a multimeter, so I'm a little confused.

Thanks!

Danilo Jiménez
Union Pacific and DB Cargo H0 models.
Märklin, Brawa, MTH and some Walthers cars (nobody is perfect!)
Pinball machines, jukeboxes and Horses.
Costa Rica, pura vida!!
Offline Wal  
#2 Posted : 31 August 2014 13:11:06(UTC)
Wal

Australia   
Joined: 07/09/2012(UTC)
Posts: 67
Location: Sydney
Hello Danilo,

I believe that the PCB is there to manage the lighting. I have implemented a number of digital upgrades to my Z locos. It involves replacing the Marklin PCB with a third party PCB containing all of the digital functionality. You are correct about the screw making one point of the electrical connection.

The other on the Marklin PCB's is a couple of fine copper wires which connect to a copper "internal power bus" near the capacitor (brown and green component) in the large opening of the PCB in your image. The digital PCB I use actually comes with copper wire to make contact with the capacitor wire.

The power from the rails is picked up by the loco wheels and transferred by copper contacts from the wheels up into the body to the "internal power bus".

I hope this makes sense as I'm not sure of the correct terms for all the internal parts of the loco.

Cheers,

Wal
Offline Hackcell  
#3 Posted : 31 August 2014 16:54:10(UTC)
Hackcell

Costa Rica   
Joined: 21/11/2013(UTC)
Posts: 521
Originally Posted by: Wal Go to Quoted Post


The other on the Marklin PCB's is a couple of fine copper wires which connect to a copper "internal power bus" near the capacitor (brown and green component) in the large opening of the PCB in your image. The digital PCB I use actually comes with copper wire to make contact with the capacitor wire.



Hi Wal,

These two wires are used to feed the motor. If I bend it the motor doesn't work but the light does.
Danilo Jiménez
Union Pacific and DB Cargo H0 models.
Märklin, Brawa, MTH and some Walthers cars (nobody is perfect!)
Pinball machines, jukeboxes and Horses.
Costa Rica, pura vida!!
Offline hgk  
#4 Posted : 02 September 2014 00:17:41(UTC)
hgk


Joined: 10/11/2006(UTC)
Posts: 455
Location: Pacific Ocean
Hi Danilo, It would be helpful if knew which model loco the board is from. If I have the same then I'll check it and make block diagram of the circuit.
-George
thanks 1 user liked this useful post by hgk
Offline Hackcell  
#5 Posted : 02 September 2014 00:32:30(UTC)
Hackcell

Costa Rica   
Joined: 21/11/2013(UTC)
Posts: 521
Originally Posted by: hgk Go to Quoted Post
Hi Danilo, It would be helpful if knew which model loco the board is from. If I have the same then I'll check it and make block diagram of the circuit.
-George


Hi George,

It's an old F-7. 8860 if I'm not mistaken.

Thanks in advance!!
Danilo Jiménez
Union Pacific and DB Cargo H0 models.
Märklin, Brawa, MTH and some Walthers cars (nobody is perfect!)
Pinball machines, jukeboxes and Horses.
Costa Rica, pura vida!!
Offline hgk  
#6 Posted : 03 September 2014 00:37:48(UTC)
hgk


Joined: 10/11/2006(UTC)
Posts: 455
Location: Pacific Ocean
Hi Danilo,
Here's a diagram of the electrical path from the tracks to the board. Let me know if anything is unclear to you.
You can also look at the exploded parts view to see the mechanical connections:
http://www.maerklin.de/s...1&artikelnummer=8860
-George
thanks 1 user liked this useful post by hgk
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