[TenTec] Paragon Issue Stumps Me

[Gary J FollettDukes HiFi]

The frequency readout in a Paragon is NOT a frequency counter. It is simply reading  the BCD image of the frequency that the CPU is telling the synthesizer to generate.

If it is “scanning”, than the circuit that reads the VFO encoder and sends the information to the PLL is not operating correctly. This circuit reads the pulses from the encoder to change the divider in the PLL loop (via the CPU) to generate the local oscillator frequency. The PLL may indeed be ramping but only because it is being told to do so.


Sadly the most likely candidate for failure in this case is the CPU…

Gary


W0DVN

> On Feb 20, 2016, at 10:10 PM, JB <n4nqy at jbedmonds.com> wrote:
> 
> I finally got a chance to do some triage on my sick Paragon.  Owned it 15
> years and never had much of a problem, but this one stumps me.
> 
> 
> 
> All of a sudden, when you power it on, all of the display segments light and
> it may be my imagination but they seem to scroll.    I reset the processor
> which was no help.  Next i took out the processor board and cleaned the
> contacts, unplugged the processor and re-seated it, then  plugged in back in
> (several times) with no change in symptoms . Checked the display board
> connections and each to get to connections.
> 
> 
> 
> I then switched power supplies, thinking it was the PS making the processor
> go bonkers and this did not help.
> 
> 
> 
> Anyone had this problem, and know the answer??
> 
> 
> 
> jb, N4NQY
> 
> 
> 
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