502 vs 504 sound modif

[olivier34]

hi gang, i have several machine with 502 and 504 board
i make ground modification on my 502 board to go at 504 board!
it is working very well !
i want know if i make this same modif on a 504 board, do you change anything on this board, because when you put mmb lite on a 504 board there are a lot of noise in speaker in level volume 1
somebody try this on a 504 board?

[stlscott]

hi gang, i have several machine with 502 and 504 board
i make ground modification on my 502 board to go at 504 board!
it is working very well !
i want know if i make this same modif on a 504 board, do you change anything on this board, because when you put mmb lite on a 504 board there are a lot of noise in speaker in level volume 1
somebody try this on a 504 board?

I thought that one of the big differences of the 504 board was that it included the fixes for the sound issue on the 502's.  I was debating making the bods or just buying some 504's for this exact reason (I have the MML on mine and it's very noisy).

[olivier34]

yes modify 502, with update, it is good for "hum" sound while reel is working!
but when your machine with 504 power on , or standby, you have a noisy sound , it is amplified with mml board!
i understand in casino there are a lot of noise and you can't heard that, but for home use, often you have your volume at level 1, it is very unpleasant!!!