[R-390] Tuning the IF question

[Mark Huss]

Go to Radio Shack and buy the Alignment Tool Set.  You will find one of 
them has a hex head that fits the hex holes in the I.F. Cans.  You will 
also note that the shaft on the tool is narrower than the hex head.  To 
align the top core, insert the tool a little into the core and turn.  
you will see that the top core turns.  Insert the tool farther, and the 
hex head will go past the top core and into the bottom core.  turn the 
tool and you will note that the top core does not turn, even though you 
can feel resistance to turning.  That is why the shaft is so narrow.
paolo gramigna wrote:

>Hi all,
>I'm trying to tune up my first R-390A. I have the manuals.
>When i came to the IF tuning, the manual says that each trsnsformer has two
>lugs; the primary in the bottom, the secondary in the top. The problem is,
>how can i reach the bottom one? There is no hole in the IF module chassis;
>to reach the bottom lug, i have to remove the top one; and so the
>transformer goes so much out of tune that no reading is possible on the
>VTVM. Where am I wrong?
>
>Looking forward,
>Paolo from Italy
>
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