Mike Kendall wrote:
>
> Spehro,
>     It does sound like a "cold" solder/weld joint on the lead.....however,
> I'd like to pass on a bit of "crystal" experiment of my own.  Years ago, I
> bought  a VCR that had a clock that  ran about an hour fast every day.  My
> previous wife said "your an electronics technician, fix it".  Thinking about
> it, I remembered an old electronics project book that had a clock with a
> CD4049 divide by "N" chip and a crystal.  I looked inside and saw two TV
> colorburst crystals.  Sure enough, there was a CD4049 next to one of them. I
> took a screwdriver tip and knocked very hard on the crystal case and put the
> VCR back together.  Sure enough, the clock then worked accurately.  The
> crystal was operating in a second mode of resonance.  I went to work and
> told some other people this story and got alot of skeptical comments from
> one guy.  About 3 months later, same person humbly told me he had worked on
> a similiar VCR with the same problem and that had been the fix.
> Regards,
> Mike

Hi Mike, not doubting your story, but many of the VCRs
have crystals held down by glue, and the glue goes
conductive and causes osc speed changes and stopped
oscillation. I have seen similar things which were
fixed when the crystal was "cracked" away from the glue
or the glue removed. :o)
-Roman

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