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@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@Blomand.Net>
> To: "Tentec" <tentec@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@Blomand.Net>
> > To: <zrdc28@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@contesting.com
> >
> http://lists.contesting.com/mailman/listinfo/tentec
> >
>
>
> _______________________________________________
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> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
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