Yamaha Electone EL500 service manual

[sifuconman]

Dear members,

I am trying to repair a Yamaha Electone EL500 organ which has audio problem. I had isolated the fault to the power amplifier section. I cannot proceed further because I do not have the service manual or circuit diagram of this instrument.

Any member has the circuit diagram of the power amplifier for this particular instrument ? Appreciate if you can share.

Thanks !