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Another thing you can check is for iron
filings between the flapper and the coil/magnet, I have seen these filing become
magnetized or something like that causing a sticky relay. The paper
between these same parts well. If the flapper is magnetized you may be
able to take the relay apart and put the flapper between/inside a big soldering
iron tip, the AC on the tip will de-magnetize the part.. Do this all the time
with screwdriver and other tools I don't want magnetized. Works well and
is cheep.
Paul
WB5IDM
Lawdog14 with the sticky relay switching over to or from battery
backup. This is going to sound crazy but you should try it before you
laugh. I solved many a relay problem by sticking a thin piece of
paper between the soft iron core of the coil and the clapper of the relay.
Sometimes the soft iron core becomes slightly magnetized and won't pull
in or release the clapper properly. A thin piece of paper covering the iron
core of the coil will change the magnetic flux and allow the relay to operate
as it should. I repaired about 500 Apple Laserwriter II laser
printers with this method, by inserting an Avery sticky label attached to the
soft iron coil core, The printers were intermittently indexing
on the wrong line when printing. Bad news when printing on
forms. Second thing to try is to make sure a fine piece of metal
such as a file shaving is not magnetized on the soft iron core When the
coil is energized the metal flake changes position and prevents proper control
of the moveable clapper plate. Please no boos from the BMOC.
Gary K2UQ
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