Two low time technos with the same issue . .

I have two used Technos with the 1.3 boards that have the same issue - neither will initialize the processor at all, giving consistent but random junk on the displays.

The odd thing is that these two fixtures were taken out of service in full working condition, packed, and stored in an environmentally conditioned space for about a year, and then shipped to us. Total time on the two was stated to be about 40 hours, and considering the source, I believe that to be true - they are basically in "New in box" condition.

They were run initially on 120V/60Hz, and that is what we have been using here, and the voltage jumpers are correct.

So, the quesion is simply: What can hit two units the same way, in a year of inactivity like this?

Oh, and the 5V supplies are at 4.9 or so, and don't have the diode on them to fail - all power looks good on the logic card . . . .

Anyone have any ideas? Two with an identical issue makes me think this has got to have been seen before . . .

- Tim
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  • Turns out that the caps alone did not do it . . . It appears that the problem is the conformal coating having degraded or something . . . The first was cap changed, and still no-go. I stripped the coating off the entire oscillator to enable me to probe the resistors, and it has been working since.

    The second unit, I decided to test that theory. I did nothing but remove the goo, and it has been working fine since . . .

    - Tim
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  • Turns out that the caps alone did not do it . . . It appears that the problem is the conformal coating having degraded or something . . . The first was cap changed, and still no-go. I stripped the coating off the entire oscillator to enable me to probe the resistors, and it has been working since.

    The second unit, I decided to test that theory. I did nothing but remove the goo, and it has been working fine since . . .

    - Tim
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