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is' protect 'appears on display?.remove speakers & check again.if then set work without error check speakers & cable.
protect appears again there is a problem with power amp module.
something inside the unit has become faulty electronically, otherwise if u have moved the unit with cds inside, they may be out of allignment and causing the unit to go into protect.
push power protect is error signal shows problem in power amplifier board, mostly power amp out
IC STK402-100S found deceptive.
contact nearest Sony service center for proper repair.
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