Diode replacement on Yamaha DGX 500 contact curcuit board

[Rick79]

I found a lot of corroded broken Diodes and i noticed someone has already replaced about 15 of them. I cant find anywhere on the service manual the original value of the diodes. The ones that were replaced are 1N4148, but im not sure if those are the right replacements. The only Diodes i have right now are 1N969B. Can i use those or do they have to be a specific voltage to work properly?

 

[dorke]

Hi Rick,
The diodes are on the keyboard interface.
The board operates on 5V.
The 1N4148 is a good replacement.

The 1N969B is a 22V zener diode,it may work since the voltage on the board is only 5V (much lower than the 22V zener breakdown).

I would go with the 1N4148 they are very cheap and easy to get.(100 sell for about 1$)

 

[Rick79]

Hi Rick,
The diodes are on the keyboard interface.
The board operates on 5V.
The 1N4148 is a good replacement.

The 1N969B is a 22V zener diode,it may work since the voltage on the board is only 5V (much lower than the 22V zener breakdown).

I would go with the 1N4148 they are very cheap and easy to get.(100 sell for about 1$)

Ok, Thank you, I appreciate it.