Roland BN100 Schematic

[Carlosraj]

Hi

I am looking for a Roland BN100 schematic. Any one can help?

Thanks

Carlos

 

[turk 182]

i can't attach it here (too big)
but here's a link (post 4)1980's Roland BN-100, Need schematic

 

[Carlosraj]

Thanks alot, turk 182. I have downloaded the schematic.

Carlos

 

[turk 182]

no problem, what's wrong with the amp?

 

[Carlosraj]

There was no sound from the amp. When I plugged direct to the "main in", there is sound, so I suspected the pre-amp circuit. Upon checking I realised that the (-15V) to all the ICs was missing. One of the zener diode has shorted but could not figure out the part number as the number on both diodes (D1,D2) was disfigured, that is why I needed the schematic. After replacing this diode the amp is working fine.

Thanks again,

Carlos