Cap polarity

Replacing the caps 4 seat sent me on the 620 and I have run into a slight issue
How do you tell what the polarity of the replacement cap is?
I feel rather ignorant but never have known as this is my first recap of any kind
Thanks:scratch2:

Edit Clearly the white stripe with the ovals tells you but dont know which

On the PCB, theres usually a white circle with a white line through one side of the circle.This is suppose to indicate the negative lead.BUT........silkscreening is frequently incorrect.When I pull a cap,I double check to make sure I'm installing a new cap the same way the old cap was installed.The new caps and old caps will have a colored stripe indicating the negative lead printed on the plastic sleeve--Unless the cap is a non-polar or bi-polar electrolytic cap. If they are either one of these two, there is a NP or BP printed on the sleeve as well as on the silkscreening of the PCB as well.

What caps are you refering to?

Jpowell1 said:

Replacing the caps 4 seat sent me on the 620 and I have run into a slight issue
How do you tell what the polarity of the replacement cap is?
I feel rather ignorant but never have known as this is my first recap of any kind
Thanks:scratch2:

Edit Clearly the white stripe with the ovals tells you but dont know which

Click to expand...

What kind of caps are they? Electrolytic,Film,Ceramic?
Only electrolytic* and tantalums are polarized the rest are non-polar

* except NP and BP electrolytics.

avionic said:

What kind of caps are they? Electrolytic,Film,Ceramic?
Only electrolytic* and tantalums are polarized the rest are non-polar

* except NP and BP electrolytics.

Click to expand...

No fracking idea They are the ones 4 seat sent me based on your list for the 620
The board is marked pos and the longer legs are pos So I got that
Now I have another problem The Voltages on the new caps dont match the old ones they are 50 v instead of 25v

Jpowell1 said:

No fracking idea They are the ones 4 seat sent me based on your list for the 620
The board is marked pos and the longer legs are pos So I got that
Now I have another problem The Voltages on the new caps dont match the old ones they are 50 v instead of 25v

Click to expand...

If the originals were 25 and the replacements are 50--no problem.:yes:
If the originals are 50 and replacements are 25--Won't work..
You can go up in voltage ,but not down.

Jpowell1 said:

No fracking idea They are the ones 4 seat sent me based on your list for the 620
The board is marked pos and the longer legs are pos So I got that
Now I have another problem The Voltages on the new caps dont match the old ones they are 50 v instead of 25v

Click to expand...

Again..The silkscreen marking on the circuit boards can not be entirely relied upon.

Pull and replace parts one at a time..Note polarity of old part and install the new part the same way.

Longer lead is the positive lead - shorter lead should be marked as negative on the plastic cap sleeve.

avionic said:

Again..The silkscreen marking on the circuit boards can not be entirely relied upon.

Click to expand...

I've even found polar caps in places marked NP. Weird... but not on a Yamaha - yet anyway. On a Pioneer with a board revision that is not documented. Really helpful.