Is it obsolete to use this word? Where does it come from? I couldn't find the origin of this term.
Can I use the phrase "The machine conked out" or should I replace conked out with something else?
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It's not obsolete but it is colloquial/slang, so it would be out of place in more formal writing. It's used in the UK and US, and, I believe, in Australia, New Zealand and India.
Your sentence "The machine conked out." is a good example of the phrase, but for more formal use replace conk out with something like broke down or stopped working.
The Online Etymology Dictionary suggests:
conk (v.) as in conk out, 1918, coined by World War I airmen, perhaps in imitation of the sound of a stalling motor, reinforced by conk (v.) "hit on the head," originally "punch in the nose" (1821), from conk (n.), slang for "nose" (1812), perhaps from fancied resemblance to a conch (pronounced "conk") shell.
However, conking out predates World War I and seems to have been coined by British motorcyclists to describe problems they faced with single-gear motorbikes going uphill, and is probably onomatopoeiac.
Here's a 1911 snippet from Motorcycle Illustrated Volume 6 (Motorcycle Publishing Company):
The single-geared machines of the past required a good deal of agility at starting, were apt to "conk out" on exceptional hills and possessed very limited climbing powers when faced by a stiff ascent strewn with traffic, smeared with grease and twisting round abrupt corners.
Care must be taken with snippets in Google Books, as occasionally the date is wrong. However, the middle column confirms the year:
... and almost every maker will list a variable gear for 1912 as a consequence.
A few pages later an onomatopoeiac origin is suggested:
When the engine starts to "conk, conk, conk," retard the spark a trifle, or give more throttle if an increase in speed is permissible.
Finally, an article on British motorbike slang in The Washington Herald (Washington, D.C., July 09, 1916) shows its spread to the US:
An engine which stalls or dies on a hill in the English vernacular "conks out."
For interest, here's the whole article:
We don't know the origin. The OED says it is 'of obscure origin'. It also says that it is colloquial, so you should avoid it in formal contexts.
The word conk is slang for nose.
From Oxford English Dictionary (OED):
But conked also means to punch on the nose. From OED:
A punch on the nose or head.
1821 P. Egan Boxiana III. 338 Spring however conked his opponent,
I think it’s therefore fair to assume that conked out originates from someone being punched on the nose and knocked out.
But that is purely speculative.
I can vouch that, at least in the USA, it is very common to refer to a machine (eg: automobile engine) that stops working unexpectedly to have "conked out". If you use it properly in that sense, you will most likely be understood just fine.