[R-390] R-390 won't power up...

Wed Jan 18 12:28:32 EST 2012

With no filaments or lamps, it sounds like the power transformer isn't working.  Have you verified line voltage is getting to the transformer?  You might be able to hear it hum and that would at least tell you if it's getting power.  If not, then you could pull the power plug and verify whether it's getting voltage by measuring across the appropriate pins.  I don't have a schematic in front of me so I don't know the pin numbers but you might have that info.

If you're not sure about doing this are uncomfortable/inexperienced measuring that, then it might be better not to do this and get someone else involved as line voltage can be lethal.  Listening for transformer hum should be safe enough, though.

Be careful!

Barry - N4BUQ

 On Wed 18/01/12 11:11 AM , Terrence Harvey terrencelharvey at yahoo.com sent:
> Hi Barry;        Yes forgot to mention checked fuse and receptacle
> with continuity and power present. Sorry for the omission.   Terry
> 
> --- On WED, 1/18/12, BARRY __ wrote:
> From: Barry 
> Subject: Re: [R-390] R-390 won't power up...
> To: "To: R-390 List" , "Terrence Harvey" 
> Date: Wednesday, January 18, 2012, 11:02 AM
> 
> Did you check the fuse?
> 
> Barry - N4BUQ
> On Wed 18/01/12 10:52 AM , Terrence Harvey terrencelharvey at yahoo.com
> [1] sent:
> > 
> > 
> > 
> > 
> > 
> > Hello All;
> >  
> > First let me preface this post by saying I am not and elex tech. or
> > engineer and so not a lot of expertise in the field.  
> >     The foregoing having been said... I am trying to get my
> Phila-51
> > contract R-390 back on line. Went down some time ago in failure to
> > power on mode when function switch turned to any position. Seemed
> likely
> > to me the panel mounted micro-switch had failed ( replaced it about
> 5 yrs
> > ago with similar failure mode), so took receiver off operating
> table and
> > put aside for future repair.  
> > Recently I got around to taking front panel down and testing switch
> with an
> > ohm meter.Testing revealed switch functioning properly, so
> re-assembled and
> > re-applied power, thru Staco variable transformer, with same
> result.
> > No tube filaments, dial lights or audio. Next checked continuity of
> 3
> > conductors of power cord with all ok. Power present at chassis side
> of AC
> > input receptacle. Checked 26Z5s and they checked good on Simpson
> tube
> > tester. This is where I stand at this juncture.  
> > What are next most logical checks I need to perform???
> >  
> > Thanks for any/all help.
> >  
> > Terry Harvey
> > Crystal Lake, IL USA
> > ter
> > rencelharvey at yahoo.com
> [2]______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390Help [3]:
> http://mailman.qth.net/mmfaq.htmPost [4]: R-390 at m
> > ailman.qth.net
> > This list hosted by:  http://www.qsl.netPlease [5] help support
> this email list: http://www.qsl.net/donate.html [6]
> > 
> > 
> 
> 
> Links:
> ------
> [1]
> http://us.mc659.mail.yahoo.com/mc/[email protected]
> [2]
> http://us.mc659.mail.yahoo.com/mc/[email protected]
> [3] http://mailman.qth.net/mailman/listinfo/r-390Help
> [4] http://mailman.qth.net/mmfaq.htmPost
> [5] http://www.qsl.netplease/
> [6] http://www.qsl.net/donate.html
> 
> 