Re: VCR... Help PLEASE!!!!!!!!!!!


"Big M" <falconfan@xxxxxxxxxxx> wrote in message
news:A86dneMjuc0-ZZzZnZ2dnUVZ_vudnZ2d@xxxxxxxxxxxxxx
Thanks for all of ther feed back. Here's an update on info that will
either help you brain-trusts... or totally cload the issue.

I have an Onan generator that was factory new (it came in the MH when I
bought it new).
I also had an issue come up not too long back. The clock on the microwave
(also came in the MH) started running fast. Very fast. A minute would
turn over in about 35 seconds. (This is only when it was on gen- power).
The RV dealership said they didn't deal with such gen problems and sent me
to a specialty place. The guy checked the freqeuncy, and said it was
perfect. We even tried ramping it up and down to see if it would
increase/decrease the problem. Nothing. Said they had never seen
anything like it. Charged me $75 bucks and there I go. Funny thing is,
the fast running clock problem has disappeared for the most part... as
fast and as strangely as it came.

What next?

Thanks-
Jeff



Jeff,
Without knowing -which- Onan genset you have, I'm speculating a bit -
but it sounds like you have a problem with -noise- in the power from the
genset. The only way to tell for sure would be to look at the output
waveform with an oscilloscope - but the microwave clock is a strong clue.
Most electronic clocks synchronize themselves to the 'zero-crossing'
transitions of the AC waveform - if it's a pure sine wave, it'll have two
per cycle, as it goes positive and then as it goes negative. If it has
'noise' in the sine wave near the zero-crossing point, the clock circuit may
see two zero-crossing transitions instead of one for either or both of these
transitions - which will make the clock run fast. The VCR may be smart
enough to -know- that it's getting transition pulses outside the range that
it expects, and refuses to turn on - while the microwave just does its best
to sync the clock with what it's seeing.
The two most likely causes of this kind of 'noise' would be tarnish
buildup on the slip rings of the genset, or poor/intermittent connections
from the voltage regulator thru to the brushes. Although much less likely,
it could also be the filter capacitor on the voltage regulator starting to
fail.
I would suggest, as a first step, to run the genset for 3-4 continuous
hours with about a 50% load - if the problem is tarnish, this should take
care of it. If you are still experiencing problems, then it's time to find
somewhere that has an oscilloscope to look at the actual waveform of the AC
from the generator.

Alan


.

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