B&O SD-9 / 6-28205 / full speed only in command

Can you swap in a different R2LC Radio board.  If that doesn't do it, may be the ACDR.  But since you can't program it may be the radio board.  G

Since it sequences normally in conventional, I'd be betting on the R2LC.  If the ACDR was at fault, I'd suspect it wouldn't have normal operation.

Thanks.  I'll swap an R2LC board from another engine and see if it makes a difference.  Appreciate both suggestions and troubleshooting tips.

Bruce

You'll know right away, if the new R2LC sees the TMCC signal, it'll wait for you to apply throttle.

Make sure you program the new R2LC, including the feature code.  From the User's Manual...

It was likely the receiver board, however I did not make any changes.  

• With the engine on the track in program mode Instead of bringing the command power immediately up to 18V  I selected the track via the TPC then slowly brought the power up using the ZW throttle.  The engine made a couple of clicks and buzzes but did not move as power was advanced to 18V.  
• I then turned the track power off and back on at full 18V and the engine did not move.  
• I did a full reset as GRJ outlined, turned off track power, and moved the switch to run.  
• I turned track power back on and the engine responds correctly both in command and conventional mode.  All features work.

So the problem is solved, at least for now. Hopefully the command programming will hold and the gremlin will not reappear.    

Thanks again for thoughts, suggestions, and instructions.

Bruce

Very odd, we'll keep listening here to see if that holds.

 Where  is the U connection  from the command base hooked up to  and  how or when does  base get power  . 

I suspect if the U connection went directly to an outside rail this problem would   disappear.

Gregg posted:

 Where  is the U connection  from the command base hooked up to  and  how or when does  base get power  . 

I suspect if the U connection went directly to an outside rail this problem would   disappear.

The base and ZW receive power from a switched power strip.  The U connection goes to the U / common connection on the ZW which is also common to the track.  Has been this way for 12 years and all TMCC and Legacy engines have behaved well.  The problem seems to be solved for now, although it was not a textbook fix and may not stick.  Thanks.

Bruce