Apologies and R-390A Power Swictch Question

Robert M. Dunn dunnr at IX.NETCOM.COM
Sun May 30 18:50:03 EDT 1999

Hi All,

Apologies if you have seen this before and/or for any problems a previous
version of this message caused.  I was just informed by a list member that I
have been sending out e-mail in HTML format and that causes problems for the
reflector.  Thanks to Steve Harrison for pointing this out and I have now
fixed the mailer to only send out plain text.

Has anyone found a source or substitute for the R-390A's microswitch that
switches the power on/off?  It is mounted to the function switch on the
backside of the front panel and is actuated by a cam on the function switch.
The entire function switch is labeled S102 in the parts list, there is not a
separate number for the microswitch.  My microswitch is very close to the
end of its useful .  I successfully got it off and opened up after the
contracts fused closed and the radio wouldn't turn off.   When I had it open
I burnished the contacts and reassembled it. Now it is making an arcing
noise when I power up and it cannot be long at this rate before it burns up.

Anybody else had a similar experience and located a source of spares or a

I am waiting for the arrival of the bristol wrenches before pulling the
front panel again so I have a few days before I try anything.  Suggestions
appreciated.   THANKS to ROY MORGAN who pointed me to the problem and
suggested that I open the switch up and unstick the contacts.  Since my
first attempt to fix the switch I have found the web page
http://www.islandnet.com/~dma/Boatanchors/r390an95.htm which describes
pulling the switch apart but at this point I think a replacement of some
sort is in order.


Rob Dunn

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