Old Sony MHC/HCD-GZR5D mini Hi-Fi system first level diagnosis assistance

sim_tcr

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Hello All,

I have an old Sony MHC/HCD-GZR5D mini Hi-Fi system which is not powering on.
I would like to attempt a first level diagnosis to understand what component went wrong.
I found the full service manual for the model and is attached here.

I am first trying to check if the power transformation board is working fine. (page 61 in service manual)
On the board, with multimeter I see 240V AC coming between L and N points on the board. (see attached picture)
On the board, J and I will be AC or DC? (see attached picture)

IMG_1247.jpg
 
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