[Icom] RE: IC-746 Final/PA problem

[Peitzer, Woody]

> Jim:
> 
> As Adam implied, the drive/pre-drive stages are common, only the final
> stage differs for 2M.
> Check the 2SC1971, 2SC1972 (both avail from RF Parts), and there is a
> 3SK??? 1W FET at the input to the power amp.  Any may have failed.  Trace
> it out.  Hope that helps....
> 
> 73,
> Woody AK2F
> ---------------------------
> Hi Jim,
> 
> It may be a regulator problem. The technician at the Icom Canada service
> centre informed me today that the IC-746 has separate HF/6m and 2m PA
> sections - as illustrated in the IC-746 product brochure.
> http://www.qsl.net/kb9sss/IC-746/IC-746-Brochure.pdf
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
> 
> If this is true
> 
> "> In the IC-746, there are separate PA's for HF/6m and 2m. Each PA uses a
> > matched pair of 2SC2694's. The drivers are matched pairs of 2SC1972's,
> and
> > the pre-drivers are 2SC1971's (separate HF/6m and 2m chains)."
> 
> then why did my HF/6 and 2 meters all go out at the same time?  Could I
> have
> a problem other than the PA's?  Anybody have other ideas before I send it
> off to ICOM.
> 
> 73, Jim
> 
>