الفني هيستبدل الشاحن المستعمل بشاحن اصلي.

A natural Egyptian Arabic pronunciation is:

el-fanni hayistabdel esh-shaḥen el-mostaʿmal be-shaḥen asli

A rough word-by-word breakdown:

• الفني → el-fanni
• هيستبدل → hayistabdel
• الشاحن → esh-shaḥen
• المستعمل → el-mostaʿmal
• بشاحن → be-shaḥen
• اصلي / أصلي → asli

So the whole sentence sounds something like:

el-fanni hayistabdel esh-shaḥen el-mostaʿmal be-shaḥen asli

Here, الفني means the technician.

A learner might know فني as an adjective meaning technical or sometimes artistic, but in this sentence it is a noun: technician.

• فني = technician / technical
• الفني = the technician

Because it has ال and comes at the start as the subject, the meaning here is clearly the technician.

In Egyptian Arabic, the prefix هـ or حـ is commonly used to mark the future.

So:

• يستبدل = he replaces / he is replacing
• هيستبدل = he will replace

So هيستبدل is basically:

• هـ = future marker, like will
• يستبدل = he replaces

Together: he will replace

This is one of the clearest Egyptian features in the sentence.

It is mostly understandable to speakers of both, but it leans Egyptian because of هيستبدل.

The vocabulary itself is quite formal/shared:

• الفني
• استبدل
• الشاحن
• المستعمل
• أصلي

What makes it sound Egyptian is the future form هيستبدل. In Standard Arabic, you would more likely see something like:

سيستبدل الفني الشاحن المستعمل بشاحن أصلي

So the sentence is a good example of Egyptian grammar using mostly widely understood vocabulary.

استبدل means to replace or to substitute.

It is especially useful when one thing is being removed and another thing is taking its place.

In this sentence:

• the old item = الشاحن المستعمل
• the new item = شاحن أصلي

So the technician is not just changing something in a vague way. He is replacing one charger with another.

Because استبدل is commonly used with this pattern:

استبدل X بـ Y

This means:

replace X with Y

So here:

• الشاحن المستعمل = the used charger
• بشاحن أصلي = with an original charger

That بـ is the equivalent of with in the English pattern replace X with Y.

So:

• استبدل الشاحن المستعمل بشاحن أصلي = replace the used charger with an original charger

This is about definiteness.

• الشاحن المستعمل = the used charger
• شاحن أصلي = an original charger

The first charger is definite because it has ال:

• الشاحن = the charger
• المستعمل = the used

The second charger is indefinite:

• شاحن = a charger
• أصلي = original / genuine

So the meaning is:

the technician will replace the used charger with an original charger

If the second noun were definite too, you would get something more like with the original charger.

In Arabic, adjectives normally come after the noun they describe.

So:

• الشاحن المستعمل = the charger used → natural English: the used charger
• شاحن أصلي = a charger original → natural English: an original charger

This is completely normal Arabic word order.

Also, the adjective usually matches the noun in definiteness:

• الشاحن المستعمل
  both are definite

• شاحن أصلي
  both are indefinite

That agreement helps you see which words belong together.

Because ش is a sun letter.

In Arabic, when ال comes before a sun letter, the l sound assimilates into the next consonant.

So:

• written: الشاحن
• pronounced: esh-shaḥen

You do not really say the l sound there.

But in الفني and المستعمل, the ل stays because ف and م are not sun letters:

• الفني → el-fanni
• المستعمل → el-mostaʿmal

Yes. مستعمل commonly means used, second-hand, or previously used, especially for products and objects.

So:

• شاحن مستعمل = a used charger
• الشاحن المستعمل = the used charger

In a sentence about electronics, repairs, or sales, مستعمل is a very natural word.

Here, أصلي means original in the sense of genuine or authentic.

So شاحن أصلي means:

• an original charger
• a genuine charger
• an authentic charger

In everyday usage, this often contrasts with:

• a fake item
• an imitation
• a generic substitute

So the sentence suggests the technician will replace the used charger with a genuine/original one.

In careful standard spelling, this word is usually written أصلي.

But in informal Arabic writing, especially in everyday typing, people often leave out the hamza and write:

اصلي

Both represent the same word here.

So for learners:

• أصلي = more careful/standard spelling
• اصلي = very common informal spelling

The meaning in this sentence stays the same: original / genuine.

Because in Egyptian Arabic, subject-first word order is very common.

So:

• الفني = the technician
• هيستبدل = will replace
• الشاحن المستعمل = the used charger
• بشاحن أصلي = with an original charger

This gives:

The technician will replace the used charger with an original charger

Arabic can also use verb-first structures, especially in more formal varieties, but this subject-first order sounds very natural in Egyptian Arabic.