Last week my dcs system (1 tiu/ 3aiu) stopped. The Z4000 breaker popped and I'm unable to find a short anywhere.I then discovered no output through any channels in the tiu,even at the bench. It's a Rev L. All 4 fuses appear intact but no juice passes to the outputs. I've read all previous posts on the subject on the forum,but to no avail. Any help would be appreciated.Thanks a lot.

Original Post

you probably had one of the 4 diodes that are on the input n output for  your tiu shorted. check across the red n black terminals on the tiu meter set for ohms and you'll probably find a direst short.

they can be replaced by an asc tech , or if you know how to solder you can replace them yourself. do you know how to use a vom volt ohm meter?

 

o gauge  trains ,music ,computer repair windows 7 and 10!

ASC Tech MTH school completed! 2019 !

ok here is a picture of the tiu inside the tvs diodes are marked TVS if I were you I would change all 4 of them chances are if one is damaged chances are the other 3 could go anytime since they may have been shocked from a voltage spike ! ok

you can purchase the tvs diodes from digikey electronics 1.5ke36ca

Alan

if you need other help feel free to ask!

 

o gauge  trains ,music ,computer repair windows 7 and 10!

ASC Tech MTH school completed! 2019 !

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There's no need to replace all the TVS diodes if one is shorted, you're just risking PCB damage for no gain.

No polarity on the TVS parts, they're bi-polar.

First step is to check continuity across the outputs with the TIU totally disconnected from everything.  If you have a short, or only a couple of ohms, replace that TVS.  This is the TVS I use, though if you're running at more than 22 volts input to the TIU, I'd probably bump it up to the next higher voltage level.

1500W 33.3V TVS at Digikey

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