Have I damaged Santa trolley?

V

van5

Talyllyn Railway. I of M, Old Land Rovers
24 Jan 2010
169
4
Great Barr, Birmingham
#1
My daughter's Santa trolley ( LGB21011 Marklin 14025839 ) is required to run at a church Christmas tree festival for 3 days but when we took it out of the box it would run for only a few seconds. I searched out the parts diagram and the nearest was 21013. Cutting a LONG story very short when I applied power direct to the motor the machine functioned well. There was intermittent continuity between the wheels and the motor C terminal. The fault lay on the blind side of the connection board (18), I cannot get to the circuit side and do not know what is on that board, perhaps a capacitor or resistor?

I have soldered a fine wire between the exposed solder pads on the duff side on the connector block 18 and the trolley runs well.
What have I bypassed and does it matter?
 
Neil Robinson

Neil Robinson

Registered
24 Oct 2009
9,206
520
N W Leicestershire
#2
What have I bypassed and does it matter?
Short answer, I don't know and probably not.
I suggest you measure the current taken if you can do this easily, if not don't worry. You may get further reassurance if you can check that there isn't any interference with nearby radios or TVs.
 
V

van5

Talyllyn Railway. I of M, Old Land Rovers
24 Jan 2010
169
4
Great Barr, Birmingham
#5
[
Thank you, I said that it was a LONG story,.
Track eliminated using a rolling road, all contact surfaces cleaned, resistance checked close to zero!
No major Volt drops found. The problem was obviously between the pick ups and the motor leads! One and a half day's work to get that far..

Presently the current on a rolling road is 0.20 amps and the TV is unaffected. Does anyone know what is on the back of that circuit board?
 
Paul2727

Paul2727

Registered
5 Jun 2018
79
27
53
England
#6
Don't know if this will help as it's an older diagram. It does however suggest that this model just had a pcb that clipped onto the plunger pick ups with no fancy electronics to no ill effect.
Regards,
Paul.
110113_90cff74f33dd8e2d116fd8ee01d60b8f.jpg
 
PhilP

PhilP

G Scale, 7/8th's, Electronics
5 Jun 2013
21,251
2,455
Tamworth, Staffs.
#7
There is nothing 'electronic' on the board, just the four clips to holder the carbon brush holders.

It might be that, oil escaping from old grease, had contaminated this area and was interfering with current flow?

If you are only drawing 0.2Amps, I would say you have sorted the problem, and that the motor is in good health.
Enjoy!