[Premium-Rx] Marco Press-Lite switch needed for WJ

[Terry O']

Greg,
That's a good suggestion, but the power switch on this WJ-8888 was wiped 
out by an efflorescing nicad battery, which is in the same compartment 
and just above the switch.

Thanks,
Terry O'
http://Watkins-Johnson.terryo.org
http://BlackRadios.terryo.org



On 6/21/2014 9:01 PM, VK3XYZ at wia.org.au wrote:
> Hi all,
> I don't have any of those switches, only a repair suggestion.
>
> I assume the switch and light are separate circuits in the switch? If so and
> the signal  being switched is a low current signal, it's not wetted or not
> well wetted,  then I'd try are recover the contact.
>
> If it is a contact wetting problem rather than a pitted contact problem then
> I'd give the following a go -  I've done this on relays in the past that
> have gone open contact with success, should work on switches too I expect.
>
> Put a DC power supply on current limit below the contact rating (say 1/2 to
> 2/3) and voltage setting below rating. Connect this across the contact and
> operate the switch/relay as quickly as possible. Eventually the oxide
> coating will break down and return the switch to being operational. As you
> can't operate a switch as quickly as a relay, you perhaps may need to
> increase the voltage to rating or above to start the breakdown process or
> just be patient operating that switch? And of course if it's double throw
> you'll potentially need to address the other side as well.
>
> If that fails or it's a pitted contact problem then ... not sure if it's a
> round or square you're after but there were some round Marco switches on
> eb*y recently .
>
> Hope that's of use.
>
> Greg