[Premium-Rx] HF-2050

[Ed Tanton]

Hi Jerry: get yourself some QUALITY (for gold) contact lubricant (I use 
Cramolin B100L) and swipe EVERY board edge, and multi-pin connector (boards 
first, then connectors) until it clears up. Keep track of which ones you've 
done, so you know where to re-start in case it warms up enough to stop 
doing it. (Meaning you'll have to let it cool off again.) Also be certain 
that when you remove a multi-pin flat connector, you know which way to plug 
it back in after swiping the pins with contact lube. If "Pin 1" isn't 
obvious, and if the connector isn't 'keyed' to insure proper orientation, 
make your own small dot using a Sharpie marker at one end of the connector 
and another SMALL dot on the pc board. Most connectors-when their cable has 
been laced & dressed for several years-will only go one way anyway.

Also, re-seat any ICs in sockets (if it has any-I haven't been inside a 
'2050.) Do not remove them, just press them down-most of the time you'll 
hear a 'pop' indicating any oxide-buildup between IC and socket has been 
'exercised' out.

If none of this helps, one final thing you can do is simply measure the 
main DC supply voltages while it is misbehaving-since a power supply 
capacitor could (but not likely) be doing this. Just want you to cover the 
bases that you can cover before the big bucks of sending it out.

This procedure will not harm anything, and is your best bet-and should be 
within your range of expertise. Just make certain you use a quality brand 
of gold contact lubricant, and not some abrasive blue TV tuner mess 
(fortunately those types of mechanically tuned, contact-filled, tuners are 
pretty much gone-and hopefully so is that abrasive blue stuff!)


73 Ed Tanton N4XY <n4xy at earthlink.net>

Ed Tanton N4XY
189 Pioneer Trail
Marietta, GA 30068-3466

website: http://www.n4xy.com

All emails <IN> & <OUT> checked by
Norton AntiVirus with AutoProtect

LM: ARRL QCWA AMSAT & INDEXA;
SEDXC NCDXA GACW QRP-ARCI
OK-QRP QRP-L #758 K2 (FT) #00057

--------------------------------------------------
"He that gives up a little liberty to gain
temporary security will lose both and
deserve neither".
--Benjamin Franklin

"Suppose you were an idiot ...
and suppose you were a member of
Congress...  but I repeat myself."
--Mark Twain
--------------------------------------------------