RE: Re: How to repair Garage Door Opener?

["Keith Doxey" <ukha@xxxxxxx>]

Hi Steve,

It will be the frequency and depending on the manufacturer it will be kHz
or
MHz.

My guess is probably 26.995 Mhz. I cant find anything with those numbers in
Rapid, Farnell, or Maplin catalogues. Rapid and Farnell both have large
ranges of crystals but both go from 24.0 to 27.0 MHz in one step. Its
possible it is a custom cut crystal for that particular device rather than
a
standard one. It might also be that it is one of the radio control
crystals.
Tim Morris would probably know those values being a keen RC Modeller.

As for "The Ex-Electronics company known as M*****".... I have
more
different values of crystal in my component boxes than they have in their
catalogue. I certainly WONT be getting the next catalogue they bring out.

Keith



> -----Original Message-----
> From: sdickson@xxxxxxx [mailto:sdickson@xxxxxxx]
> Sent: 18 August 2001 14:35
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: How to repair Garage Door Opener?
>
>
> Keith,
>
> finally got round to dismantling the remote control again there's a
> crystal in there and it's definately rattling. I need help to
> identify it please.  Standard 2 leg form and the markings are
> 26995.00 HT51215.  What does that mean, presume the 26995 is the
> frequency in Hz or Mhz.
>
> Thanks,
>
> Steve
> --- In ukha_d@y..., Keith Doxey <ukha@d...> wrote:
> > [ukha_d] How to repair Garage Door Opener?There is probably a
> crystal or
> > ceramic resonator in there somewhere to run the oscillator.
> >
> > Broken crystals is a major cause of remote control failure. The
> break when
> > subjected to shock, eithere totally or a bit chips off and alters
> the
> > frequency. Either way .....it stops working as it should.
> >
> > Keith
> >   -----Original Message-----
> >   From: Steven Dickson [mailto:sdickson@xxxxxxx...]
> >   Sent: 02 August 2001 09:25
> >   To: 'ukha_d@y...'
> >   Subject: [ukha_d] How to repair Garage Door Opener?
> >
> >
> >   Guys,
> >
> >   I dropped (from my pocket whilst half way up a ladder, onto
> concrete) the
> > remote control for the garage door opener last night and now it
> refuses to
> > work.  It's one of those 'radio' type ones.
> >
> >   Before I end up destroying the thing how can I get it working
> again.  The
> > led still lights when the button is pressed.
> >
> >   I've taken the cover off and there's a few bits that would
> perhaps have
> > got messed up, two trimmers / pots, and an address bank switch. 
I'm
> > presuming that I've probably altered the frequency slightly.
> There's not
> > really allot else in there other than a few smt resistors and
> diodes and an
> > smt QFP chip.
> >
> >   I'm going to make a note of all the switch positions and then
> change one
> > at a time, then try the pots.  Any ides on how I might know if
the
> thing is
> > transmitting anything in it's current state - haven't got a
scanner?
> >
> >   Any help much appreciated.  It's a Kiwi unit and the
> manufacturers have
> > since gone bust.
> >
> >   Thanks,
> >
> >   Steve
> >
> >
> >         Yahoo! Groups Sponsor
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