[TenTec] Paragon logic board

[Bob McGraw - K4TAX]

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




----- Original Message ----- 
From: "Mike Bryce" <prosolar at sssnet.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, August 20, 2013 8:47 PM
Subject: Re: [TenTec] Paragon logic board


> Hi, Bob,
>
> no I have not tried that yet. it is kind of a bear Getting that PCB in and 
> out.
>
> If I recall that's c5 on the logic board. Right?
>
> I am not sure that is the problem. I have tried turning the radio on by 
> the  power supply and seeing if I can get the thing to reset. No joy.
>
> There is no display, and sometimes all the LEDs are on, and sometimes all 
> the LEDs are off
>
>
> Mike wb8vge
>
> Sent from my iPad
>
> On Aug 20, 2013, at 9:23 PM, "Bob McGraw - K4TAX" <RMcGraw at Blomand.net> 
> wrote:
>
>> Have you changed the timing cap, 4.7 mf as I recall, on the RESET line at 
>> the microprocessor.  Sounds like the processor is running before all of 
>> the operating parameters are loaded.  I suggest using  one a bit larger 
>> up to a 10 mf to assure things start in the correct sequence.  This just 
>> slows things down a bit during initialize.
>>
>> 73
>> Bob, K4TAX
>>
>>
>>
>>
>> ----- Original Message ----- From: "Mike Bryce" <prosolar at sssnet.com>
>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>> Sent: Tuesday, August 20, 2013 7:50 PM
>> Subject: [TenTec] Paragon logic board
>>
>>
>>> Well gang, the subject line says it all.
>>>
>>> I am in need of a paragon logic board.
>>>
>>> There is no display, all the LEDs light up, or some LEDs light up, or 
>>> randomly they light up at power turn on.
>>>
>>> Thought it might be a reset problem, but so far I have not been able to 
>>> track it down.
>>>
>>> This one is a real head scratcher.
>>>
>>> Mike WB8VGE
>>>
>>> Sent from my iPad
>>> _______________________________________________
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>>> TenTec at contesting.com
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>>
>>
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