Uptown automation part II

pucho812 · Oct 13, 2019

Fader test fails and the 5v supply from one of the psu shuts off.

Any ideas?

Brian Roth · Oct 13, 2019

Measure the resistance from that 5VDC rail to 0V. Shorted PSU bypass capacitor??

Bri

pucho812 · Oct 14, 2019

Brian Roth said:
Measure the resistance from that 5VDC rail to 0V. Shorted PSU bypass capacitor??

Bri

will get into it further and let you know. thanks.

thejoerusso · Oct 16, 2019

Anyone actually have schematics for the cards? Haven't had a hard short like that, only pico fuses blown. I'm working on a system that's in pretty good shape but have an odd fault or two.

pucho812 · Oct 16, 2019

thejoerusso said:
Anyone actually have schematics for the cards? Haven't had a hard short like that, only pico fuses blown. I'm working on a system that's in pretty good shape but have an odd fault or two.

We have big fold outs, nothing in soft copy. I can compile what I have durning the weekend and post it

pucho812 · Oct 24, 2019

Finally back on this... if I disconnect any random bank of faders reducing the system from 48 down to 40 it runs no issue. After a brief conversation with one In the brainiacs of said system, was told ok you have a bad supply that cannot meet the current demands. Replace it. It’s a linear supply so should be easy to get from mouser.

pucho812 · Nov 13, 2019

This was finished a while ago but replaced one of the 5vdc power supplies with an exact original spec supply. After it was installed. Ran fader tests and everything ran as expected. No more power supply trip from current draw.