latching relay in IC-756 PRO

[Jamie]

For the last couple of years or so, I've had a sticky audio relay that
most of the time does not engage on this rig, so I don't any audio to
the speaker in the radio. It never bothered me that much because I have
the rig connected to the computer and thus, I just use the computer to
listen to it. Common problem with this rig in earlier models I guess.

Once in a while it would turn itself on "Click" after some time of
being on.. For the last 3 days of so, it has been coming on at boot up
every time and staying there. Maybe I've worn off the sticky edge that
has been holding it up

Maybe now is a good time to sell the radio

Jamie

 

[Jeff Liebermann]

On Sun, 09 Sep 2012 18:01:00 -0400, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

For the last couple of years or so, I've had a sticky audio relay that
most of the time does not engage on this rig, so I don't any audio to
the speaker in the radio. It never bothered me that much because I have
the rig connected to the computer and thus, I just use the computer to
listen to it. Common problem with this rig in earlier models I guess.

As I vaguely recall, the problem was that the relay tended to get
magnetized. Two possible solutions.
1. Pry the relay open and put a thin piece of mylar tape between
solenoid core and the armature.
2. Remove the relay, and degauss the solenoid core with a tape head
demagnetizer. You can do the demagnetization trick with the relay
still in the circuit, but disconnect the at least one lead from the
coil. Shorting the coil with a clip lead might also work, but I've
never tried it.

I've never had to demagnetize a radio relay, but I've certainly had my
share of similar problems with HP printers:
<http://802.11junk.com/jeffl/hp2200/hp2200.html>

Once in a while it would turn itself on "Click" after some time of
being on.. For the last 3 days of so, it has been coming on at boot up
every time and staying there. Maybe I've worn off the sticky edge that
has been holding it up

The solenoid core is becoming more magnetized.

Maybe now is a good time to sell the radio

One lousy relay and you're ready to junk the whole radio?
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558