Fantom -S88 high pitch whining noise on output

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diydidi
Posts: 1
Joined: 05:47, 12 October 2015

Fantom -S88 high pitch whining noise on output

Post by diydidi »

Hi.
I have this keyboard for repair. I run an electronics repair shop here in South Africa. The unit works perfectly except that it has a high pitched whining noise when using the line outs. I have tried a balanced cable but it is still there. I really have to crank my external amplifier to hear it, but its for a church and they say they can hear it. I have even used a DI box to lift the ground.
Is this normal? I dont have another one here to compare with.
Regards
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