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Dax 1 modulator fault

Posted: Thu Jun 03, 2021 3:28 pm
by TonyG
I'm working on a bunch of DAX 1 PA modules and I'm having a problem with one that shows a modulator fault in the fault log. All of the components that matter (FETs, ICs, diodes, etc) appear to be fine, so why does the -Vc line measure zero? Chasing my tail here ...

Tony

Re: Dax 1 modulator fault

Posted: Mon Jun 14, 2021 4:30 pm
by TonyG
Hi again,
Ok, all of the floating supply rails (-Va, -Vb, -Vc) are measuring low (around 13K) between their checkpoints and gnd. Is this a commonly encountered fault?

TG

Re: Dax 1 modulator fault

Posted: Mon Jun 28, 2021 8:06 pm
by COMMENG
TonyG wrote: Mon Jun 14, 2021 4:30 pm Hi again,
Ok, all of the floating supply rails (-Va, -Vb, -Vc) are measuring low (around 13K) between their checkpoints and gnd. Is this a commonly encountered fault?

TG
Can you post a schematic of the PA module?

COMMENG