[Test-Equipment] (no subject)

[Geoff Greer]

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
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