Kenwood mini-stereo model:KR-595 shuts off

Kenwood mini-stereo model:KR-595,year:Jan 1996,unit shuts off when power button is pressed,here is history:

Aug 7,2004: Replaced right channel: Q18=2SD2222=NPN=shorted Q20=2SB1470=PNP=shorted F13=5 amp power supply fuse=open

Feb 18,2005: Replaced: Q20=2SB1470=PNP (again) (different supplier)=base to emitter open

July 19,2005: Replaced: Q20=2SB1470=PNP (again another different supplier)=base to emitter open

And now Aug 16,2006: Q20=2SB1470=PNP=base to emitter open

Before I replace Q20 again WHY IS IT FAILING SO MUCH?.

Thanks in advance.

Sidney E-mail:sidneybek(at)yahoo.com Dartmouth,Nova Scotia Canada

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sidneybek
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