[Elecraft] Info 080 message started with RF Alignment and Test, Part II

[Don Wilhelm]

OK, the resistors were changed from 470 ohms to 100 ohma with the A to B 
changes (SN 3000), so your measurements are correct.

Give us some more detail about the VFO knob problem and we may be able 
to help.

As I indicated for another ham having VFO knob problems, look at the 
Front Panel board schematic as a reference.  Be certain there is 5 volts 
at the encoder pin 4, then power off and check the resistance between 
pin 4 and ground - it should be zero.  If those checks are OK, then 
monitor the ENC A and ENC B signal lines while moving the VFO knob very 
slowly.  The voltage should change from 5 volts to zero volts (give or 
take a half volt or so) if things are working OK.

Funny, but I feel as though I have responded to this same situation 
within the past 2 days - it seems that such problems appear in three's, 
so I am waiting for the 3rd :"shoe" to drop.

73,
Don W3FPR
On 10/26/2012 9:17 PM, AC8HU wrote:
> Ok that's what I'd thought about the resistance value there - the note (on
> Info 080 troubleshooting, in builder resources) had said that the resistors
> should be 470 ohm, and that the range should be 900-1000 ohm.  However all
> through the manual those resistors are referred to as 100 ohm, which is what
> I have installed at those points, and my measured resistance value of around
> 198 ohm would be just about dead on.  So no concern there.
>
> Just have to figure out what my VFO knob problem is now - checked solder
> points on the small optical encoder board and then gave it another shot, and
> it's still not working.  Just as before with the sudden appearance of the
> Info 080 message, there's probably one solder point somewhere that's flaky
> and it's causing my problem.
>
>
>
> --
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