[ICOM] 761 Problem

[Wayne Johnson]

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