What is the function of this capacitor?

[nosaj]

What exactly is the function of c26? This one had a blown fuse and a c26 is open. It's also odd to me for it to have a 2 prong cord which looks factory.

Thanks,
nosaj

[Enzo]

Two wire cord IS factory, look at schematic.

C26 siphons off any noise on the mains .

[nosaj]

when exactly did it change the requirement for a 3 prong cord? Or is it based on something else?
nosaj

[g1]

Sometimes they use polarized 2 prong plugs. Looking closer, I see they have + and - marked on it.
What do you mean by 'C26 is open', it's a cap.

[nosaj]

using a peak cap tester it reads open out of circuit.
nosaj

[nosaj]

Nary mind tester doesn't actually test a ceramic cap.
nosaj

[J M Fahey]

Some mains rated capacitors, don´t remember if X or Y type or something liken that, are designed to fail open, for safety reasons.

[tedmich]

Juan is right, both are designed to fail open and usually Y caps have a higher safety factor

[g1]

Class X is for line to line, Class Y is for line to ground. https://www.justradios.com/safetytips.html

[Mick Bailey]

Could it be a Class II appliance? that would account for it having a 2-prong lead, like many hifi amps, radios etc.

[Helmholtz]

Cap is wired across the LV secondary and after the fuse.
No need for an X cap. If it fails shorted the fuse will blow - so no safety issue.

I think it's purpose is to suppress diode switching noise.

Are we sure it has lost capacitance?

[Helmholtz]

Nary mind tester doesn't actually test a ceramic cap.
nosaj

I don't understand.
Do you mean the meter can't measure capacitance as low as 10nF?

[nosaj]

yes it only does 1uf to 22000uf.
nosaj