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[duncan2]

Its old fashioned flux used to help solder flow you could gently scrape it off.


They look okay but check close up to see if the solder flow changes color where the metal attaches to the solder .


You can re-flow it if you are still not sure.

 

[Fjellreven]

Can i use fine sandpapir to scrape it off i tried with to scrape it off with a flat-head Screw driver and it managed to DAMAGE the circuit board.

 

[Fjellreven]

And you know i was referring to the ones with the legs right?

 

[Fjellreven]

Also Do i have to remove the old solder Completely.

 

[Fjellreven]

Because when i made those two soldering joints i didnt remove all the old solder instead i just added more.

 

[duncan2]

No you don't have to remove the old solder just make sure the solder flow adheres to the metal legs .


Yes I know you were referring to the ones with legs .

 

[Fjellreven]

Wait do i have to remove the old flux or can i Just leave it there?

 

[duncan2]

I just added new solder but if you want you can remove it just make sure the metal legs have a solid contact with the solder.

 

[Fjellreven]

Hey i accidentally dropped a film capacitor on the floor is it still usable. Also can i use the film capacitor like this you see i can't Mount the film capacitor on the rectifier board so my idea is to use a wire from the rectifier board to the 17 uf capacitor and then a wire to the speaker transformer.also can i Mount the 5 uf film capacitors upside down under the PCB.

 

[duncan2]

Film capacitors in radios usually serve either of 3 purposes .
Either its an interstage connection or its for smoothing purposes or its for cathode bypass .


Its possible its for a tone control (if fitted ) but in any case in a radio that operates at RF frequencies it should not be moved far away from its normal position otherwise you can get instability .


Unless you stood on it dropping it shouldn't affect it.

 

[Fjellreven]

I am using the big film capacitor as a reservoir cap.

 

[Fjellreven]

Also can i Mount those 5 uf capacitors upside down.there is very limited Space on the board.

 

[duncan2]

Yes you can.
Just make sure the HT+/power supply doesn't cross over the tuner circuit ,keep the power supply away from the aerial input.

 

[Fjellreven]

Also i was wrong the 17 uf doesnt go to the speaker transformer it goes to a wire straight to the board.

 

[Fjellreven]

Hey is it okay to Mount electrolytics like this i know this looks wierd buy its replacing a big multisection capacitor.

 

[duncan2]

Yes its okay you are replacing them directly into the soldered copper PCB holes occupied by the old capacitor .


Keep the pins soldered as close as you can to the board.

 

[Fjellreven]

Is IT okay that the capacitor to the left is a little tilted?

 

[duncan2]

Yes that's alright , you are working on the power supply , it wouldn't be alright if it was the RF section.

 

[TG]

It actually depends - some capacitors should be mounted strictly vertically.
But most of those are big snap-in or screw terminal ones. For smaller PCB caps (especially the ones with "scored" aluminium top plate) mounting position is not that important.

 

[Fjellreven]

Hey is colored Steel wire good enough for extending capacitor leeds