Yamaha electone EL90

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Joined Mar 31, 2024
Am handling Yamaha electone EL90 organ which has no sound,, the power supply is okay, the amplifier is okay, through aux it works, the exp pedal is okay when you self test with C# chord it responds, everything on the display is fine except sound, my suspension is with the VCA ic m5283p which is over heating. I don't know what to expect on pins 2 & 15 ( vc1 and vc2) . How can I solve