Why would any tech need a manual for that? But maybe you are not technically inclined (you didn't say) and need a step by step to open said laptop (you didn't tell.)
If there is such a manual, it's in the service centers but today I'm seeing less of such things and more e-documention. Sometimes its in some very proprietary system and never a PDF.
So let's say it does not exist. Since it's just a broken power jack then you are in luck. No tech would need a manual to replace that or touch up the solder work.
I have been googling for days now with no luck. I need the ascer aspire 9300 laptop repair manual. I have paid for the download on some site but when I go to find it it has disapeared.so if any one could point me in the right direction for a free download of this service manual I would be most grateful. The reason being I dropped the laptop breaking the power lead connector on the main board.