AT&T 4425 (Teletype 56D) repair - FIXED

[Seth Morabito]

Well that was fast and easy. Thank goodness.

It turns out the culprit was the Astec power supply. It had a dry
solder joint on the "DC OK" line. A few drops of fresh solder later
and the terminal is good as new (well, as good as any 35-year-old
terminal can be, anyway)

While I was inside, I removed a very old but thankfully non-leaky
battery. Need to figure out a new battery if I want to preserve
settings.

If anyone is interested, I did dump the terminal's ROMs while I had it
open. They're here:

    http://www.loomcom.com/3b2/att_4425_rom

-Seth
-- 
Seth Morabito
seth at loomcom.com