dcs system

While ensuring that the TIU always has power, connect a short piece of track to each channel in turn and do a DCS signal test with a stationary engine and note the readings.

Any channel that yields something other than 9 or 10 indicates a defective channel.

If all signal strengths read high, then the TIU is fine and the problem is elsewhere.

This sounds like you are using variable channels (instead of fixed) to operate your PS2/3 engine in command mode. 

Is there some particular reason you're doing this?

The fixed channels are the ones intended for command operation. 

mike Norbert i run in varible1 so i can also run conventional engine when in the mood but mostly i run proto 2 and tmcc .

Barry it looks to be variable 1 went out again because all channels work except the varible1. well i will run in other channels and send in if anything else goes.