[R-390] Should this work?

[JMILLER1706 at cfl.rr.com]

Is the diode load jumper missing in the back?  Getting voltage there?  
Bad gain pot?  
JM

----- Original Message -----
From: Barry <n4buq at aol.com>
Date: Thursday, May 5, 2005 10:14 am
Subject: [R-390] Should this work?

> Working on the "new" R390A.  I have it mostly back together (at 
> least enough
> to run some tests).  I tested everything except the RF deck by 
> substitutingthe modules into my working radio and everything I 
> tested checked out
> functional.
> 
> When I powered up the radio, I got nothing on the audio except a 
> small hum
> when the volume is turned up to 100%.  I didn't figure on hearing 
> anythingin the way or radio signals since the RF deck is in 
> complete need of an
> alignment, but I did expect to hear some noise.
> 
> I injected the audio signal generator into pin 7 of the plug that 
> connectsthe IF deck (P112) and was able to get good audio on both 
> line and local.
> 
> I then decided to take the IF output from the working radio's RF 
> deck (with
> the radio tuned to a good strong station) and plug it into the 
> input of the
> IF deck on the radio under test.  Since I had checked the IF deck by
> substituting it into the working radio and it does work there, I 
> figured I
> should get some signals that way.  Still nothing.
> 
> Is this a valid thing to try?  I realize the IF deck still needs a 
> touchupfor alignment, but it should be close enough to hear 
> something through the
> chain.  It worked when I substituted it into the working radio a 
> few weeks
> ago so I assume it should still be working.  Unless something has 
> brokensince then (and I'll try substituting it again to make 
> sure), I would think
> this should produce some signals.  No?
> 
> Thanks,
> 
> Barry - N4BUQ
> 
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