This is clear image

 

Hello,

It looks like, as I indicated, a way of telling the range of the capacitor.
I usualy use an other type of trimmer capacitor:



The upper ones are air capacitors, the lower ones are foil comperssion capacitors.

Bertus

 

Yes the only problem is this that my trimmer have "infinity turns" namely it is not like potentiometer that its turn can stop in a specific turn way! If I understand right the trimmer have exactly the same function concerning on its turns (I mean not their function on the circuit! I mean if they looks the same concerning their turn positions!)?

 

Hello,

With the type of capacitors you have, the minimum and maximum value are half a turn apart:


The black part is the silver part of your capacitor, the three blocks show the pins.

Bertus

 

Aaaa now I understand! You mean this colored paint with the silver color near this bolt is the range that cover this trimmer? If yes then I should to say this word to myself "You are stupid! The answer was right under your nose!"
And if this answer will be "yes" the purple dot is the mark that show me where the trimmer's range begin or finishing?

 

Hello,

I always look at the silver colored half to see where the capacitor is.
You only have half a turn from minimum to maximum, as indicated in my drawing.

Bertus

 

I think I have a bit lower than quarter or equal to the quarter on the trimmer! I right understood? I see a silver paint with a purple dot in one edge of this paint right near this bolt! It is exactly this paint you speaking?


PS (Nice cat in the photo, its look so cute!)

 

Hello

I want to learn something! In which position I should to put the trimmer? I sent a circuit that explains exactly how all the components is positioned on the PCB layout! But the trimmer? How it is connected?

 

Oooooh sorry I forgot to send the circuit