Bob,
You likely have an unsoldered or poorly soldered connection on the Front
Panel Board.
Separate the front panel from the board and you can probe most
everything on the front panel board.
Do a visual check and you may be able to find it - check pin 1 of the U1
socket, that is a common one to skip soldering on. Check the pin 1 of
all the rest of the ICs and pin 1 of the connector.
Those pin 1 places have round solder pads while the other pins are
rectangular pads and it is easy to miss the pin 1 solder connection and
not notice it.
73,
Don W3FPR
Bob Fish wrote:
Hi Gang,
I have been tolerating an intermitant problem with the display on my
K2 for several months now and finally I've decided to dig in and fix
it. Here is the problem, After powering up the radio, the LCD display
will go blank. Sometimes after 5 minutes , sometimes after 45 minutes.
The S-meter still works fine and the audio from the radio seems ok. I
can change frequencies and I get the expected sounds from the speaker.
When I first started experiencing this , I merely powered the radio
off and then on and the display returned to normal operation. However,
now the problem is happening with greater frequency. Sometimes
recently, I sit down and turn on the radio I will get no LCD display
and I can power it on and off 10 or 15 times in a row and still no
display. I can come back 10 minutes later and get the proper display
on the first power up. Also sometimes when I change bands the display
will only partially change, in other words the right hand side of the
display doesn't change only the first few digits of the left side
change. Many other peculiar anomalies, too numerous to mention, have
presented themselves recently.
Here is the problem, I cant figure out a way to get a meter in the
various places that might shed some light on this problem while the
radio is in a failed condition. Short of disassembling the radio and
tack soldering some enamel wire to various strategic points in the
circuit, reassembling the radio, waiting for a failure, to make
voltage measurements and thereby make a reasonable guess as to where
the failure might be. Has any one seen this problem before or have an
idea on a good way to chase it?
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
