[aprssig] troubleshoot MFJ-1270B?

Curt, WE7U archer at eskimo.com
Tue Sep 14 15:47:29 CDT 2004

On Tue, 14 Sep 2004, Chris Kantarjiev wrote:

> I just picked up a 1270B TNC, with the intent to turn it into a RELAY
> APRS digipeater. When I apply power, I get lights on STA CON PWR,
> and they all stay on. No serial communication so far. The ROM
> inside is marked SYSTEM TNC 2 1.2.8 - 32K.
> I've got some information here, but am wondering if this might be
> a commonly known problem, before I start poking with the oscope?
> Also, will this version of the ROM support RELAY operation, or
> should I be planning to upgrade? To what, UIDIGII?

Take your thumbs and push in any socketed IC's fairly hard.  Make
sure you're not flexing the PCB too much though while doing this,
but press HARD.

Also check the soldering on the bottom of the board.  I recall one
or two of those that I had to debug that were poorly soldered from
the factory and we had to resolder all the points.  The solder
should be shiny.  If you see dull-looking solder, consider touching
it up.

Curt, WE7U			         http://www.eskimo.com/~archer
"Lotto:    A tax on people who are bad at math." -- unknown
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