[R-390] Is your R390A Power Cord Connected Correctly ?

[Tom Bridgers]

This is excellent info ... easy to follow, andvery important.Thanks, Chuck, for your posting.-Tom  KE4RHH

> Date: Tue, 4 Dec 2012 04:01:43 +0000
> From: chuck.rippel at cox.net
> To: r-390 at mailman.qth.net
> Subject: [R-390] Is your R390A Power Cord Connected Correctly ?
> 
> Been running into radios where people (quite correctly) add a 3 wire 
> cord in place of the 2 wire.  In some casese, the connections for the 
> neutral and hot side of the line at the back of the radio. under the 
> removable protective cover have been reversed.  The result has been, the 
> hot side of the input was not fused and did not switch off.  Rather it 
> was the neutral which was fused and switchesd  1 short to chassis 
> ground, no fuse would blow and......  Also, the transformer always had 
> 115V on the primary as measured to chassis ground.  Not a good situation 
> at all.
> 
> Is yours so configured?  To check, unplug the radio and remove the 2 
> nuts securing the rear panel A/C line input cover.   !! Make a 2nd check 
> that the R390A A/C line has been unplugged !!!   Pull the fuse and with 
> an ohm meter, check continuity from the line side of the fuse to the 
> rear panel connection where the black wire on the line cord is 
> connected.  It should read 0 ohms.  If there is no black wire, ohm from 
> the line side of the fuse to that prong on the line cord which would 
> plug into the narrow side of your A/C outlet.
> 
> 0 ohms from the line side of the fuse to the black wire or to the prong 
> which plugs into the narrow side of the outlet is correct.  If not, 
> reverse the A/C connection on the back of the radio attaching the black, 
> hot wire to the terminal which is connected to the line side of the 
> fuse.
> 
> Do not make this check and subsequent countermeasure unless you fully 
> understand the process and end result.
> 
> 
> ---
> No  trees were killed to deliver this message.  However, a large number 
> of electrons were terribly inconvenienced.
> 
> Chuck Rippel
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