K3 PA Temp Reading Unstable

[paulb]

Hi folks

K3 here has developed a slight problem with the PA temp sensing..
it is flicking between normal and +40 several times per minute.
noticed the fans starting in a very cold shack RX only running.
This may have been happening for a while, but never noticed until
the cooler mornings.

Havn't taken a look at the PA or circuits yet, wonder if another user
has a start point ? My guess is the sensor or related components.

thanks

cheers

Paul
zl1ajy

[LY4OO]

Hi
PA temp readings jumping from -110C to 110C, looks like troubles with
temperature sensor. Where to start dig?

Dan
LY4OO



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[Roger-3]

Check Q1 (MJE182) and U1B (LM6482). Most likely U1 is bad..................

73/Roger - DL5RBW





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