Question about Kenwood XD-A55 CD Shelf System

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Kenwood Allora XJ7M

No Audio but have power.. 4 pcs. audio equipment
try to change the amplifier transistor D2250. But no luck at all. Pls help TY in Advance....

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This is error code which system control detected either power irrgularities or dc voltage is detected from the speaker out put line.This fault we have noticed that both of them appears same time also.Pls change Amplifier ic TDA8920 and C1740 transistor and 27V1w zener diode.Transistor and zener diode is for voltage regulation and amp ic if the dc detect is active.Usualy change this three components same time.(this all is in power amp section)

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