[Kenwood] TS-940 issue

[Avi - Modi'im Orchards]

On the 440, the "all dots" condition is indicative of a PLL unlock, and the cause was that Kenwood had used a potting compound in the PLL circuit that deteriorated over time and became hygroscopic, causing partial conductivity amongst the legs of the various components. The solution, which Cliff at Avvid performed for me, was to remove all the components and all the potting compound in the affected area and replace the components with new ones. 

But simple misadjustments can also cause PLL unlocks, so I would check the Kenwood service bulletins for your 940 before going to extremes.

YMMV

-avi 4X6UA
  ----- Original Message ----- 
  From: K9vt at aol.com 
  To: kenwood at mailman.qth.net 
  Sent: Thursday, November 27, 2008 11:48
  Subject: [Kenwood] TS-940 issue


  I just came into a what one gentleman said was a working 940SAT.  When I turn on the radio the lights come on and the frequency read out is nothing but dots. If I press the on/off button a number of times it does seem to come on. After a short heating period it seems to be ok. While in the non working condition if I hit any of the band buttons the right frequency does show up than goes back to dots. Anyone have any thoughts?   When the frequency readout initializes the radio operation is normal. Love the radio..just a minor issue ..thanks Ken





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