[R-390] Diagnostic Help Needed

[Jim M.]

Some initial thoughts:
If the 3FT7 ballast tube (on the IF deck) isn't glowing slightly, then 
several oscillator tubes (BFO, PTO, etc.) may not be getting filament.
Hopefully the band change gears and mechanisms haven't gotten "out of sync".
Try turning the calibrator and BFO on and see if you can hear a calibrator 
carrier every 100 khz.
Rock the band change knob back and forth and see if something comes in - 
sometimes the band switches get corroded.

Also:
Some common failures:
http://www.r390a.com/Commonfail.htm

Some restoration topics:
http://www.qsl.net/k5bcq/r390/r390.html

A large manual is available at:
http://www.hausernet.com/r390a/

More of Chuck Rippel's page
http://www.r390a.com/

Good luck,
Jim N4BE


----- Original Message ----- 
From: "Carole White-Connor" <carolew at bellatlantic.net>
Cc: <R-390 at mailman.qth.net>
Sent: Wednesday, February 21, 2007 7:45 PM
Subject: [R-390] Diagnostic Help Needed


>
> I powered up my new R-390A project tonight and the news isn't good. There 
> is
> static from the speaker but no stations. When I plug the antenna into 
> either
> of the inputs, there is no change in the static. The only place I seem to
> get a station is around 780 khz but it's very garbled. I get nothing at 
> 1250
> khz, which is an AM station about a mile from my house.
>
> Before powering it up, I replaced four missing 5814As with 12AU7s. I also
> replaced the troublesome caps in the IF deck (as per Chuck's page).
>
> I need some step-by-step instructions to diagnose the problem. The test
> equipment I have is a VTVM and a signal generator.
>
> Any help would be great appreciated.
>
>
> Joe Connor
>
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