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Yamaha C4 - zener diode WZ130 - Power C Board

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No Zener diodes listed in the SM for the Flat Amp board!
Not in my HiFi Engine version at least.
Might anyone have a list of them?
 
Yes, seems there are no Zener diodes in the flat amp C Board. But, wasn’t you referring to the Zeners D503/504 in the power C board?
 
Thanks Dr Ear.
Looking at the board I can see lots, but not in the SM..
Really want to change them over as part of the final effort to eradicate the source of the hum.
Caps be changed over too. A list or advice for procuring exactly the correct replacements would be much appreciated.FA95340D-477C-45D0-8576-0D0360964398.jpeg
 
Those may not be Zeners and just regular diodes and should be left alone unless they have failed.

Zeners have this symbol on the board
iu



And regular diodes will have this symbol

iu




A zener diode allows a pre determined about of voltage to pass through it , while a normal diode will stop the voltage.

Athanasios
 
Thanks @avionic, you're probably right but I need some help here..
I can see a total of 12 orange and black (diodes/zener) diodes on my Flat Amp board.
But the SM I downloaded from HiFi Engine lists the caps etc., resistors, and then fizzles at the part where they normally list the diodes. A screenshot attached below.
Forgive me if I'm missing something obvious but I just want to be able to replace them taking into account Nashou's advice of course.
Does anyone know the correct replacements?
Screenshot 2022-02-19 at 17.42.49.png
 
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