[1000mp] 20 meters dead

[T. David Cohen]

Thanks so much for the replies.  I located a service manual online and I'll
put see what I can do.

73s,  Dave.

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
On Behalf Of Deric Affleck
Sent: Saturday, September 24, 2011 12:51 PM
To: All about Yaesu 1000mp
Subject: Re: [1000mp] 20 meters dead

Hi David,

Sounds like the Local Unit board located under the Antenna Tuner - hard to 
get at but it is do-able.
Probably one of the phase locked loops has quit oscillating - the one that 
is for 20 meters. If you are lucky it might come to life if you "tweak" that

stage with a tuning tool to get it going again. What happens sometimes the 
voltage drops off shutting down the oscillator. It is a known problem and 
sometimes it can be a cold solder joint then requiring removal of the local 
unit board to access the solder side and by examining the solder joints with

a magnifying glass you can see an "iffy" jointor two which you can re-heat. 
CAUTION: you have to be careful when handling this and other boards to use a

grounded anti-static wrist strap to ensure you don't harm the board 
components. I has similiar symptons with my 'MP except it was all bands - 
the sub-receiver worked OK but no receive or transmit on any bandand turned 
out it was a transistor supplying voltage to all the phase lock loop 
circuits.
If you don't have the service manual I suggest you borrow or buy one as it 
is an asset for servicing the "MP.

Hope you can solve the problem.

73,

Deric, VY2DA
----- Original Message ----- 
From: "T. David Cohen" <tdavid26 at cox.net>
To: <1000mp at mailman.qth.net>
Sent: Saturday, September 24, 2011 12:46 PM
Subject: [1000mp] 20 meters dead


> Hi folks,
>
>
>
> A problem with my MP - 20 meters is dead on the main receiver  and there 
> is
> no RF output (the display works fine and the VFO seems to be OK).   The 
> sub
> receiver seems to work OK on 20 but when using that VFO, still no output.
> The other bands seem to be OK when using the main receiver and there seems
> to be normal RF output.  I've tried a reset but the symptoms are 
> unchanged.
>
>
>
> Any suggestions would be appreciated including a suggestion on a shop that
> might be willing to repair it.
>
>
>
> Thanks!
>
>
>
> Dave Cohen, N7TC
>
>
>
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