If you buy a Crystal, then I'll bet you $5 it's the cpu! (hi)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Mike Bryce
Sent: Thursday, August 22, 2013 2:47 AM
To: Discussion of Ten-Tec Equipment
Cc: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Paragon logic board
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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