[TenTec] Fw: Problem with Paragon I
Robert & Linda McGraw K4TAX
RMcGraw at Blomand.Net
Sat Aug 27 08:15:10 EDT 2005
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.
----- 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
> 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
> 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.
> Bob, K4TAX
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