[Elecraft] No ears , k2#5315

[r opdebeke]

Bad connection on X6 was the problem ,
Thanks all who helped tackle me this problem, now I can listen for some 40 
meter actrivity !!!


Roger
OE6MSF

>From: "Don Wilhelm" <w3fpr at earthlink.net>
>Reply-To: <w3fpr at arrl.net>
>To: "r opdebeke" <ropdebeke at hotmail.com>,<elecraft at mailman.qth.net>
>Subject: RE: [Elecraft] No ears , k2#5315
>Date: Tue, 14 Feb 2006 08:01:33 -0500
>
>Roger,
>
>If the S-meter is lively, most likely the stages through the IF amplifier
>are probably good.  Be certain you see an increase in the S-meter when the
>Pre-Amp is turned on and a decrease when the Attenuator is turned on -
>expect about a 1 or 2 LED bar difference in both cases.  Your voltage at 
>the
>AGC Threshold of 3.78 volts is not an indicator of a problem at this point.
>
>Did you pre-set the BFO frequencies to the values shown on page 89?  If 
>not,
>that alone may be your problem.
>
>If you have set the BFOs and still have inadequate audio, the problem can 
>be
>in the 2nd Xtal Filter, or the Product Detector, or the Mute or AF Amp
>stages.  Check the DC voltages for these stages and compare to the DC
>voltage chart in Appendix F as a first step - you should measure DC 
>Voltages
>within 10% of the value shown in the chart.
>
>If the DC Voltages are OK, check all the signal paths from the 2nd Xtal
>Filter through the AF Amp for good solder connections - the signal paths
>include all 3 boards and their connectors because the AF Gain control is
>located on the Front Panel.  Use the schematic as a guide in identifying 
>the
>signal paths.
>
>The sidetone is injected into the audio amp IC at a separate pin from the
>audio, so that indicates only that the Audio IC is capable of producing 
>some
>sound.
>
>73,
>Don W3FPR
>
> > -----Original Message-----
> >
> > I'm building K2 #5315, everything went well upto page 64 where I
> > should do
> > the IF amplifier alignment.
> > It appears that there is no audio at all ( beter say very very weak ).
> > I cheked the earphones by hitting the SPOT , which was ok.
> > But I can not hear the 7000 internal signal at all.
> >
> > When I tune my VFO there is definitely a signal  and the S-meter
> > runs very
> > well, especially above  7100 where all of those commercial staions are.
> >
> > Checked the agc  . I got 3.78 V on U2 pin 5 , that is fully CCW R1.
> > AF gain pot is approx 5 k , Rp6 (7-8 ) is 5K , R1 is 50K
> >
> > checked 8R , D6 is 7.73 V and D7 is 0 V
> >
> > All looks ok , anyone any suggestion ?
> >
> > Cheers
> > Roger
> > OE6MSF
> >
> >
>