hi, i'm student from a university from Indonesia
i currently working on a lecture task in laboratory, especially aquaculture and meet this problem
my air pump doesn't work anymore
because i'm not sure it's about the power wire problem (the power wore looks good in condition)
so i decided to disassemble it and check for the internal components problem,

hope this instructable solve your problem
and sorry for bad english
(btw this is my first instructables hope you enjoy it)

Step 1: Disassembly

before doing this step,
make sure the power line is-OFF-the-power-socket

turn your air pump upside down and unscrew it
don't lose all the bottom screws, you'll need it later
so keep it,

turn your air pump back, and open up the lid/cover

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