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This engine is a K Line K3380-1361C, Steam Locomotive.  The symptoms are: All functions seem to work from a Lionel Legacy Cab Controller.  However when activating the throttle the Locomotive does not move.  After attempting to cause the Locomotive to move the functions that worked before no longer are activated when commanded.

The locomotive will accept ID reprogramming and acknowledge with the characteristic whistle blow.   Not that I believe this to be an issue but is puzzling to me, When I reset the Locomotive by performing the classic ENG-"ID"-SET-AUX1-"Eng Type" sequence the Keypad does not show a numeric alternative, only the functions of Legacy when executing the AUX1 key.  I was under the impression that the AUX1 brought up the numeric keypad.  But I issue the key that would be "Eng Type" being the four position but no indication that sequence was received by the Locomotive aka Whistle Blow.

My first sequence of physical trouble shooting was the removal of the Tender Shell.  Visual inspection revealed nothing out of the ordinary.  I removed the two daughter boards and reset them.  Reassembled the Tender and proceeded back to the layout.  No difference in activity as experienced previously.  Thinking that it might be a "Cruise Control" issue due to nonmovement of the Locomotive, I proceeded back to the Bench.  I removed the Boiler Shell and visually inspected the innards.  Again every thing looked nominal.  One thing I did not expect was it appears on this Locomotive the Cruise Control is monitored with a light source through a slotted wheel by the Flywheel.  It seems the last locomotive that I had an issue with had a paper tape around the flywheel for the Cruise Control.  I half expected that to be the issue when I began to suspect the Cruise Control as that tape had a habit of coming off the Flywheel.

There was one daughter board that I reset and as with the Tender I again saw no indication on any of the boards any heat damage.  At this point I still have the Boiler Shell off and am waiting to see if anyone can point me in a direction to remedy my issue(s).  Thanks again to responding to yet another "What's wrong with my Locomotive" thread.

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cjack posted:

 As to the aux1 bringing up numerals, I don’t remember if that is an issue with the engine type feature, but I have often had to just count the squares and press the representative square when presented with the Legacy symbols.

Are you aware of any type of indication such as a whistle blow that the command has been acted on by the Locomotive?  The K Line instructions for the Locomotive do not indicate any response.  Just curious as it has been a long time since having to have done this procedure.  Thanks.

I think, because there is always a possibility I haven't, have checked the easy stuff that is always referenced on threads such as this. I am somewhat hoping it to be a failure in one of the boards that does not visually show, such as heat damage that might be apparent. I have a sister Locomotive to this one that is running. Instead of me quessing which daughter boards(s) to exchange first, I was hoping someone could point me to the one that logically could be the culprit. 

gunrunnerjohn posted:

The easy board to swap is the R2LC, that would be my first attempt. 

GRJ,

From my notes:

Removed daughter board from motherboard

Tag labeled 5932, 06/03, chip on component side labeled R2LC08, Lionel Trains Board labeled on solder side Lionel Trains, 691-R2LC-C, no visual signs of heat damage

This board is located in the Locomotive Area and not in the Tender.  Is this correct?

cjack posted:

A visual inspection is probably not going to reveal much. I’ve never had a bad one look visibly bad.

The visual inspection was only to see if there was noticeable Heat Damage as a result voltage spikes.  Multilevel boards, which I haven't analyzed the boards thoroughly, to see if they are can have hidden damage.  It would not take much to melt an imbedded Trace.

If I did not make the statement the first question I would get is "Is there Scorching on the Board?" So I fended off 10 of those questions.

gunrunnerjohn posted:

Yes, the R2LC is in the locomotive.

Is this board not the communications board? If all other functions appear to work until the throttle is moved, would that not indicate that this particular board is working?  GRJ, you are correct that this is an easy board to check since I already have the boiler off the suspect Locomotive. But taking the Sister engine apart and swapping the boards and then testing both engines to determine if the anomaly follows the suspect board seems to be an effort in futility.  However since you very rarely, if ever, have I seen you steer anyone wrong on this Forum, if you say do it, I will.  Just need a little more of your thought process for this endeavor.

BobbyD posted:

In looking thru this, does it run conventionally with your TMCC/Legacy system unplugged from the wall? (I may have missed that post if you responded about it.)

No, I did not try that test.  I am right now getting up the energy after my morning Cup of Coffee to go down and do as GRJ suggest.  When I get both Locomotive assembled I will try your test.

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