Tek TDS5104B has developed acquisition issues

[emcee2]

Hi.  We have a TEK TDS5104B.  It was working fine, or so I am told.  Now it reports Acquisition and Trigger errors on boot into the TekScope program.

I've opened it up... poked around a bit.  The supplies (+/-15; +/- 5) on the acquisition board are present, though there is a LM2941S low drop-out adjustable regulator with 15V in and 11.2 Volts out.  Seems odd.  I'm assuming that should be 12V but, but with no schematic its a bit difficult to figure what the load is.  Maybe something is dragging it down.

I'm wondering if that regulator is feeding the hybrid/bonded circuits under those input cans.  Can anyone confirm?  I haven't yet gotten to the point of pulling the board out... time, and inclincation being my hurdles at the moment.

Any insight is most appreciated.  Cheers!

[mikehank]

Hi,

Could you be more specific as to the error messages?  The input hybrids do go bad but I don't think they would cause trigger errors.  Most of Tek's scope bypass the front end when testing the triggers.