Roland / Boss BR900-CD schematic or service notes please help

[domu]

I have a shot BR900-CD which does not power properl - hang on boot.
Second week and no go. Without a schematic my chances to fix it are
close to zero.

I do have schematics of other Roland digital recording studios, but they
are completly different.

Anyone please?

[sugeda]

https://docdro.id/NShNLyZ