[1000mp] Help Troubleshooting FT-1000MP

[Ron]

I found a bad transistor on the Local PCB which shut down VCO 1 - 4.     
I checked it over for bad solder joints but all I found were very nicely 
solder connections.  The way it failed I figured it was a part failure.  
The part which was a surfaced mounted part go replaced with a 2N3904 
which is a heavier duty part all the way around so figure that problem 
is gone forever. 

Thanks to the couple of people that responded.

Ron   WA0KDS







Ron wrote:

> I finally took the FT-1000MP apart to try to find out why it quite.  
> It looks like something in the PLL   LO 1 loop has quit.  LO 2 and 3 
> both are working OK.  I have not went looking for bad solder joints 
> yet but expect that will be the first step.  But  if a part has failed 
> is their anyone specific part that has been known to fail that might 
> be the problem.  I tried to set the voltages of VCO 1 to 4  but they 
> are all low and stay there no matter what the frequency. 
> Any help or suggestion will be welcome. I will probably be working on 
> this radio on an off most of the day  either  until I get  tired off 
> it or  get interrupt to  work on something else.
> The sub-receiver works fine as does the front display.  I have tried 
> the processor reset which doesn't resolve the problem.     I don't 
> think this is a voltage regulator issue but  let me know your thought.
> Thanks Ron   WA0KDS
>
>
>
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