[ICOM] 761 Problem

[Robert Brucker]

Hi Allan, Do you have the repair manual? Robert W6LFO 

On Aug 11, 2010, at 10:26 PM, Wayne Johnson wrote:

> Gday Allan, Sounds like the PLL VCO's are either unlocked or on the 
> verge of unlocking. Most of that generation of Icoms had bad plastic 
> trimmer caps used to set up the lock voltage in the individual vco's, 
> over time they become faulty (some say because of resin contamination 
> from when they were first soldered into place.You may find some bands 
> are OK, there's 4 of them in the radio and it's a common failing
> Replace them with good quality ceramic types, they were available at 
> Altronics (Check the service manual for values required)
> Easy the replace and setup the correct loop voltage, the service manual 
> shows the procedure for adjustment, you should only need a good digital 
> Multi meter.
> Best to check the loop voltage first for the band and frequency as 
> detailed in SM, if it is not at spec. replace the trimmers.
> 
> Cheers and all the best
> 
> Wayne
> VK6EH
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