Re: {Collins} KWM-380 Synthesizer unlock

["joe" <w0tut@xxxxxxxxxxx>]

----- Original Message ----- 
From: "Gayle Lawson" <k0fly@xxxxxxxxxxxx>
To: "K4PRF Burton Pratt" <pratt@xxxxxxxxxxx>; "Collins Reflector"
<Collins@xxxxxxxxxxxxx>
Sent: Tuesday, April 07, 2009 5:01 PM
Subject: Re: {Collins} KWM-380 Synthesizer unlock


> Does the freq display work correctly.  If not check the control card, the
uP
> isn't operating, presets aren't going to the synth causing the out of lock
> condition and the alarm is triggered.
>
> If the control is Ok then check the -18 volt supply ( its a little
inverter
> supply) .  There is a tantalum cap in that circuit that fails.  No
> -18, the synth won't lock up.
>
> Gayle
>
> K0FLY
> ----- Original Message ----- 
> From: "K4PRF Burton Pratt" <pratt@xxxxxxxxxxx>
> To: "Collins Reflector" <Collins@xxxxxxxxxxxxx>
> Sent: Tuesday, April 07, 2009 12:23 PM
> Subject: {Collins} KWM-380 Synthesizer unlock
>
>
> > This is probably a common problem with the KWM-380.  I have the service
> > manual and have studied it regarding this problem.  Before I tear into
> > this rig and start replacing parts I thought I would check to see if any
> > of you might have some starting pointers or know ofcommon faults.  There
> > is a rapid beeping in the audio output,  VFO reads normally and no RF
> > output.
> >
> > Burt  K4PRF
> >
> > _______________________________________________
> > CCA DAYTON 2009 INFORMATION:
> > HOTEL  -  BANQUET  -  BOOTH
> > http://tinyurl.com/dlyywg
> >
> > SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
> > http://www.collinsradio.org/membership/
> >
> >
> > NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
> >  SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
> >  1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
> >
>
> _______________________________________________
> CCA DAYTON 2009 INFORMATION:
> HOTEL  -  BANQUET  -  BOOTH
> http://tinyurl.com/dlyywg
>
> SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
> http://www.collinsradio.org/membership/
>
>
>  NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
>   SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
>   1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
>