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Re: [TenTec] Paragon - easy to work on?

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Paragon - easy to work on?
From: geoffrey mendelson <geoffreymendelson@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 25 May 2010 07:38:37 +0300
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On May 25, 2010, at 3:38 AM, Phil Chambley Sr. wrote:


> I was referring to the Dallas MC146818AP Rom/Rom/Rtc chip on the  
> daughter
> board, which has its own battery and lasts for 10+ years at worst.
> It is possible some of the Paragons had other than Dallas chips, and  
> some of
> them did not have on-chip batteries.
> Check out:  http://www.informit.com/articles/article.aspx?p=30273&seqNum=15

Those I am very familar with. Most PCs of that era had them and so did  
SUN computers. By the time they ran down a PC with one was not worth  
the cost of a new one, and possibly not worth the cost of battery, but  
SUN's were. IMHO they still are. (how's that for a 10-15 year old  
computer?). So over the years, I have rebuilt many of them.

Someone documented how to replace the battery as part of a SUN NVRAM  
FAQ. I'll see if I can locate it, and post a reference to it.

Quite simply, the chip itself is a regular chip with a battery on top  
held in by a brittle potting compound. If you know the proper end of  
the chip to remove, you can carefully do it with pair of diagonal  
cutting pliers, chipping away at it. The only critical thing is to get  
the polarity of the battery correct, an error will destroy it

Any 3v battery will do, and I used to use lithium coin cells with  
wires soldered onto them. In the US, where such things are easily  
found, one with tabs would be easier. Now I would just buy a socket  
(or steal one from a dead PC) , solder it to the chip and use a  
CR-2032 coin cell.

In a pinch I once did one with a flat pack of 4 AA batteries, but I  
doubt it would fit in a radio.



geoffrey mendelson N3OWJ/4X1GM
Jerusalem Israel geoffreymendelson@gmail.com
New word I coined 12/13/09, "Sub-Wikipedia" adj, describing knowledge  
or understanding, as in he has a sub-wikipedia understanding of the  
situation. i.e possessing less facts or information than can be found  
in the Wikipedia.

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