[R-390] Silent R390A won't turn off

[Glenn Little WB4UIV]

Sounds like the power switch, a small micro switch, has welded its 
contacts closed.
This is not uncommon.
Best to run the R-390A from a buck transformer to reduce the line voltage.
The R-390A was designed in an era where line voltage was less than today.
Have a suitable on/off switch on the buck transformer and use it to 
power the R-390A on and off.

73
Glenn
WB4UIV

On 3/16/2020 9:26 AM, Jim Bishop wrote:
> After working fine last night, my R390A was turned off,
>
> It was turned to standby this morning long enough to fix coffee. It was
> silent when switched out of standby and now will not turn off.
>
> Ideas?
>
> THAnks for any assistance,
>
> Jim Bishop
>
> 金永朋 (Golden Friend Forever)
>
> jim.bishop at gmail.com
> Skype JDBishop5
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-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"