[ICOM] re:IC761 p/s

[Gary P. Fiber]

Alan,

Be sure to check the current shunt resistor. It appears to be a flat bar 
about 1.5 inches long and 1/4 inch wide. That fault you have many times 
is caused by cracked solder joints at the current shunt. The repair is 
to remove it, clean up the old solder and resolder it. Do not overflow 
the shunt with solder as you will change the resistance value.

Gary K8IZ
Alan wrote:
> I have an IC761 which has a problem in the power supply shutting down 
> under load.
> Appears to be suppplying voltage under no-load. Wasnt sure if XCVR 
> problem or powersupply
> but connected external supply to radio and worked ok. I hope I have 
> found the problem in
> a faulty transistor 2SC2501 either Q2 or Q3(not sure which one), would 
> appreciate an opinion
> as to the likelihood of this causing the problem, multimeter says it 
> has C-E short, will try and get a new one for it tomorrow. No sign of 
> any corrosion in mine when opened.
>
> Alan ZL3KR
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