[Test-Equipment] (no subject)

[Mike Manes]

I've also seen this with mechanical rotary switch style quadrature
encoders when they are turned faster than the electronics can sample
the switch states.  If it's this style, then, fingers crossed, a shot
of DeOxit might be all that's necessary to fix it.  But if it's an
optical encoder, this joy juice shot is a BAD plan!

73 de Mike W5VSI

Geoff Greer wrote:
> 
> Hi,
> 
>   This behavior sounds like your unit is unit uses an rotary encoder with quadrature outputs.  I've seen this
> behavior on WJ radios that use this type of encoder for tuning.  Usually it's a problem with a lamp in the encoder.
> Hope this helps.
> 
> Geoff Greer
> 
> 11/21/04 16:38:36, w3sz <w3sz at comcast.net> wrote:
> 
> >Hello, All,
> >
> >I have an HP3586C Selective Level Meter that I use mostly for VLF
> >listening and frequency calibration work.
> >
> >Today the HP3586C started misbehaving; first, the frequency tune encoder
> >started occasionally skipping.
> >That is, rotating it would produce no effect for 30-60 degrees, then it
> >would work OK.  Then it
> >started only tuning down in frequency, no matter which way the knob was
> >rotated.  It is currently
> >working properly, but it has cycled back and forth between working
> >properly and not doing so several
> >times this afternoon.
> >
> >I did the brainless stuff like reseating the boards / modules / internal
> >connectors with no apparent effect.
> >
> >As I don't have schematics I am somewhat at a loss for troubleshooting.
> >
> >Has anyone else noticed a similar problem with a similar HP unit and if so
> >what was the diagnosis /
> >treatment?
> >
> >I don't have any manuals for the unit, though today I ordered the
> >operating, calibration, and parts manuals
> >on CD from http://www.fullnet.com/u/tomg/manuals.htm .  Unfortunately,
> >they don't include the schematics
> >and I haven't found the service manuals [parts 1 and 2] for less than
> >$180.00.
> >
> >Thanks in advance, and
> >
> >73,
> >
> >Roger Rehr
> >W3SZ
> >
> >--
> >Roger Rehr
> >W3SZ
> >http://www.qsl.net/w3sz
> >_______________________________________________
> >Test-Equipment mailing list
> >Test-Equipment at mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/test-equipment
> >
> 
> _______________________________________________
> Test-Equipment mailing list
> Test-Equipment at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/test-equipment

-- 
Mike Manes    manes at attglobal.net     Tel: 303-979-4899
"Things should be made as simple as possible, but not more so."  A.
Einstein