[Kenwood] TS-940S PLL Trouble

[Clif Holland]

Before it goes off is the rx audio warbley or distorted??

Clif Holland, KA5IPF
AVVid
Authorized Kenwood and Icom Service Center
816 W Shady Grove Rd
Irving, TX 75060

www.avvid.com

1-800-214-5779
972-870-0630 (Local)
----- Original Message ----- 
From: "Michael Tope" <W4EF at dellroy.com>
To: <kenwood at mailman.qth.net>
Sent: Thursday, June 03, 2004 2:02 AM
Subject: [Kenwood] TS-940S PLL Trouble


> Hi All,
> 
> I have a late model TS-940S (S/N 904xxxx) which has a
> problem with frequency display blanking (and corresponding
> receive audio cutout) which if I understand correctly is an
> indication that one of the rig's PLLs is unlocking. Originally,
> when the problem occured, the frequency display would blink
> alternating between all dots and the displayed frequency.
> Thinking I had a faulty ROM socket, I went down that path a
> soldered IC2 directly to the digital board. This didn't cure the
> problem, it just changed it. Now when the receiver cuts out,
> the display goes to all dots and just stays that way (as opposed
> to alternating between dots and alphanumeric). The problem
> comes and goes and doesn't appear to correlate with any
> external stimulus. I poked around the digital board and the
> PLL unit and couldn't find any obvious loose connection or
> mechanically sensitive points which would induce the failure
> when stimulated. Wiggling and twisting the chassis with the
> covers off (to put a little twist in the PC boards) doesn't seem
> to do anything either.
> 
> Any suggestions for what might be causing this? The radio
> works fine otherwise, but isn't much good for anything since it
> can cut out without warning.
> 
> Thanks,
> 
> Mike, W4EF......................................................
> 
> 
> 
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