[time-nuts] Wenzel Oscillator Repair (plus Tektronix CG551/CG5001/DC509/DC5009)
magnus at rubidium.dyndns.org
Wed Jan 21 03:12:07 EST 2009
Mark Sims skrev:
> Interesting... I just fixed a couple of Tek CG551 and 5001 calibration generators that had the same problem. Tek uses a DC isolated shift register chain to drive the internal control signals. The clock and data lines run through toroidal pulse transformers that are mounted on small plastic carriers. Turns out that the where the toroid leads are attached to the carrier leads they were broken. The toroids are not pookied down to the carrier.
This is a typical design error where the designer should have spent a
longer time at the repair-shop prior to getting onto the design desk in
order to be experienced enough. I have repaired alot of equipment where
people have not understood how unsupported weight may wear and tear over
the years. People that think solder is some form of magic super-glue.
For a few cases vibration isolation *might* be on their mind, but the
solution got wrong never the less.
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