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Re: [TenTec] Paragon logic board

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Paragon logic board
From: Mike Bryce <prosolar@sssnet.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 21 Aug 2013 20:46:57 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Bob and the group,

The project continues, no joy insight, the microprocessor oscillator is not 
running.

So, is it the Crystal or the microprocessor?

The Crystal is not hard to come by. EBay has them 10 for $15.

Right now, it's a crapshoot 50-50 chance it could be the microprocessor or it 
could be the crystal.

I wonder, if I were to take a 4 MHz crystal And solder it in the place and see 
if it would oscillate. I realize it would not work correctly but  that would 
show if the oscillator inside the microprocessor is operating.

Ten tec has no parts in stock. I called. 

Mike wb8vge

Sent from my iPad

On Aug 20, 2013, at 10:31 PM, "Bob McGraw - K4TAX" <RMcGraw@Blomand.net> wrote:

> Yea, the board is a pain to pull.  My schematics are at the shop, and I'm not 
> so I can't say exactly which designator is the timing cap.  It is on the 
> RESET line of the MP to ground and has a value of R to the 5 volt line as I 
> recall.  This is not the same as the external reset line to the switch on the 
> side of the radio.
> 
> As power is applied, be it from activation of the switch on the front panel 
> or from the power supply, there is a reset pulse generated by the timing cap 
> and resistor that resets the microprocessor, but only after the operating 
> parameters are loaded.  In other words, the MP starts with a clean load of 
> data.
> 
> Worth a try.
> 
> 73
> Bob, K4TAX
> 
> 
> 
> 
> ----- 
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