Yamaha digital reverb EME-1

Hello, i have an "Yamaha digital reverb EME-1" device.

The device emits strong buzzing/noise on the output, that after some time stops.
The buzzing/noise occurs only when the device is turned on.

I have tried replacing the main capacitor, but it doesn't solve the problem.

If any one has experience with this device please tell. Thanks.

see if it has 3-terminal regulators in it, and replace the small electrolytics on the input and output sides of these regulators.

Thanks, will do.