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This 2230 P150 C183 was factory installed per marked polarity

runningdog

runningdog

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"Everybody" knows that the 2230 P150 C183 capacitor polarity is marked incorrectly on the board. And that a replacement capacitor should be installed the reverse of the markings. This applies to the P150 board on several models.

This is how the cap is usually installed from the factory:
2230 P150 C183 backwards.JPG

But today, the 2230 I'm working on has the C183 cap factory installed per marked polarity.

This is how this board's cap was installed:
2230 P150 C183 not backwards.JPG

Usually I let the factory installed polarity determine how to install a new cap. But what about this time? Was the cap installed "backwards" of backwards accidentally? I think so, but what do you think?
 
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I think it must be a factory error. Does the AM tuner work? I happen to have a P150 out of my 2230 right now. I got tired of working around it as I worked out my FM tuner problems, and needing to reach test points on P300. But here is C183 on it, the way I have always found it on 2230/45/70.
IMG_0001 (20).JPG
 
You could measure the dc voltage across the pins to see how it really runs. I'd just put a new one in backwards like every one I've ever seen, the factory did make mistakes. I had a .001uF disc cap in a phono pre board once that was supposed to be 40pF.
 
IIRC, the cap is in the AGC line which is a few volts at max so polarity may not matter much...Still, backwards is backwards.

Tom
 
runningdog said:
"Everybody" knows that the 2230 P150 C183 capacitor polarity is marked incorrectly on the board. And that a replacement capacitor should be installed the reverse of the markings. This applies to the P150 board on several models.

This is how the cap is usually installed from the factory:
View attachment 2235522

But today, the 2230 I'm working on has the C183 cap factory installed per marked polarity.

This is how this board's cap was installed:
View attachment 2235523

Usually I let the factory installed polarity determine how to install a new cap. But what about this time? Was the cap installed "backwards" of backwards accidentally? I think so, but what do you think?
Click to expand...
Use a bi-polar and remove all doubt. :D
 
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