Reply to "Weak DCS signals, Failed TIU Output Drivers, and Design Solutions devloped under collaboration between AGHR and MTH"

NortonOGR Forum Member

gunrunnerjohn posted:
Pete, I see that Adrian beat me to it, 8V P-P is too low, that indicates that probably two of the four gates in the 244 have already failed. You should be getting around 14-15V P-P with a properly functioning TIU, see my previous post before and after replacing the 244 for the failing channel.
Post with signal levels before and after repair

Ok, I rechecked mine using a transformer on Fixed 1. I get 12v P-P on Fixed 1 and 14v P-P on Fixed two which I never use. I expect the two variable channels are fine as week as they never get used. I will order parts to have on hand but hold tight until something breaks.

I have to say it seems odd that these devices fail gradually instead of with a bang.

Pete

6/8/181:02 PM

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