[TenTec] Fw: Problem with Paragon I

[Roger]

Thanks for the info, I have 2 power supplies and that
was my first thought, it does the same with both.

--- "Phil Chambley, Sr." <k4dpk at comcast.net> wrote:

> Bob's references to the effect of unstable voltage
> on the uProcessor
> reminded me that, about 6 months after I got my
> first Paragon, the logic
> board began behaving really squirrelly.
> 
> Dotted lines, lock-ups and every LED lit were the
> symptoms as I recall.
> 
> Turned out, some of the early matching power
> supplies had the filter caps
> mounted with #10-32 screws through the PC board. 
> Evidently, transformer
> vibration (or something) had loosened the screws,
> making for arcing due to
> intermittent contact between the filter cap and the
> board foil.
> 
> Cure was to re-build the foil with brass shim stock,
> since it had been
> pretty well burned away by the time I found it. 
> After repair, never
> happened again.
> 
> Since then, I have repaired several others that had
> loose power connections
> in various forms, even at the Molex connector.  All
> of these were first
> thought to have Logic Board problems.
> 
> 73
> 
> Phil
> K4DPK
> www.k4dpk.com
> VFO Stabilizers and PEP adapters for wattmeters...
> 
> ----- Original Message ----- 
> From: "Robert & Linda McGraw K4TAX"
> <RMcGraw at Blomand.Net>
> To: "Tentec" <tentec at contesting.com>
> Sent: Saturday, August 27, 2005 8:15 AM
> Subject: [TenTec] Fw: Problem with Paragon I
> 
> 
> > Tried sending this direct to Vic at his address
> but it was rejected by the
> > server.  Hope he sees this.  Thanks for the
> bandwidth on the reflector.
> >
> > 73
> > Bob, K4TAX
> >
> > ----- Original Message ----- 
> > From: "Robert & Linda McGraw (K4TAX)"
> <RMcGraw at Blomand.Net>
> > To: <zrdc28 at hiwaay.net>
> > Sent: Saturday, August 27, 2005 6:54 AM
> > Subject: Re: [TenTec] Problem with Paragon I
> >
> >
> > > Vic:
> > >
> > > I've seen your post and several of the
> responses.  Before you start
> > > digging into the radio let me ask a few
> questions to clarify some
> points.
> > >
> > > From my memory of your problem, it appears that
> the microprocessor
> > > initialization from ROM is not being done
> correctly.    MP's do require
> > > that the Vcc come up to correct value and
> stabilize before running the
> > > initialization code.  The process is controlled
> by the RESET pin and the
> > > external to the MP the RC components.  Usually
> if the C value decreases
> > > with age, typical of electrolytic caps, then the
> initialization is too
> > > fast thus scrambled data is loaded from RAM . 
> I'll look at the
> schematic,
> > > but at present it is at my shop and I'm here at
> the house.
> > >
> > > Here's the questions:  No battery installed in
> all cases.
> > > 1. With the PS and radio off, turn the radio on
> then turn the power
> supply
> > > on in that order.  What happens?
> > >
> > > 2.  With the PS off and the radio on, turn the
> power supply on.  What
> > > happens?
> > >
> > > 3.  With the PS on and the radio off, turn the
> radio on.  What happens?
> > >
> > > I think you may have stated these in your post
> but I no longer have it.
> > > These answers will better allow me to assist you
> with your problem.
> > >
> > > 73
> > > Bob, K4TAX
> > >
> > >
> > >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> >
> http://lists.contesting.com/mailman/listinfo/tentec
> >
> 
> 
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> 


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