Reply to "Weak or NO DCS signal from TIU"

rad400OGR Forum Member DIGITAL SUBSCRIBER

From this post and others, I have picked up many good suggestions for trouble shooting TIU issues. It has been interesting trying to keep the clubs 14 TIUs (8 active, 6 spare) operational. summarized below are some of the TIU trouble shooting problems and" POTENTIAL" hardware causes I have picked up from the various threads. Before addressing a potential hardware problem make sure that all TIU software setting are correct.

-Variable channels with low or no track power output, potentially a bad power FET (IRFZ44)

-Track power short on the output of any of the TIU channel, most likely a bad TVS which has shorted out (1.5KE33)

-Low or no DCS signal output on any one channel, potentially a bad transmit chip (ACT244 )

-No DCS signal on any output channel, potentially a bad receiver chip (MAX 4639). The Max4639 receives only track signal from a DCS engine

If anyone wants to add, correct or update the above list, please do.

Thanks to all the contributors,

Bob D

NJ-Hi Railers

3/24/2210:31 AM

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