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DCS TIU only fixed channels working, cannot get power through variable channels.  TIU was purchased new but only needed two channels so I used the 2 fixed channels.  Now I want to use another channel and found that neither variable channel works.   Checked 20 amp fuses both good. Don't know what to try next?

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If you know the fuses are good, with the TIU powered via Fixed 1 or the Aux port, you need to Power the VAR of your choice also with a transformer and than select the VAR channel via the remote and raise voltage.  If this does not work, than most likely a Power FET has gone bad.  It is repairable.  If this is a new TIU I would send back for replacement or Warranty work.  G

Once I changed the variable channels to fixed channels the TIU worked.  I wanted to thank everyone that responded to my request and was glad for this support in OGR Forum.
 
 
theOriginally Posted by fdg:

DCS TIU only fixed channels working, cannot get power through variable channels.  TIU was purchased new but only needed two channels so I used the 2 fixed channels.  Now I want to use another channel and found that neither variable channel works.   Checked 20 amp fuses both good. Don't know what to try next?

 

The solution is to change the variable channels to fix channels and that resolved my problem and should also solved your problem.  To do this you need:
 
1.  PressMenu/System and scroll to DCS  Setup
2.  Scroll to one of the variable channels.
3.  Pres Soft key S5, FXD to put the channel into fixed mode.
4.  Repeat for the other variable channel.
 
Originally Posted by Modelrailroader:

I have the exact same problem with my TIU which also was purchased new. Recently I tried to use the variable channels and could not get either one to work, only the fixed voltage channel will work properly.

Will be interested in the fix to your problem as well as mine. 

 

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