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Stereo - Sharp CD-BA300 repair    
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Jam3s0n



Joined: 24 Jun 2011
Posts: 1
Location: Ohio
PostPosted: Fri Jun 24, 2011 2:28 pm    Post subject: Stereo - Sharp CD-BA300 repair Reply with quote
Hello,

I have a Sharp CD-BA300 I got from my brother because he was throwing it away. When plugged in it displays "PROTECT" on the display. I did a search and people said it is most likely an audio output IC failure, but I opened it up and noticed the circuit board looked kinda burnt behind a zener diode and a resistor. So, I replaced them; however, the specs of the ones I received differed from the originals. The resistor was a 2.2k ohm 1/6w and I received a 1/4w. The zener diode is a 36v 1w; I know that the original diode was 36v, but the service manual wouldn't specify the wattage so the technician I talked to when I ordered my parts went by length (to try and determine the wattage). The diode I received was almost twice as long as the original one.

My question is: How big of an impact will the new ones have on whether it should work or not?

I have already replaced them and I still get "PROTECT" in the display. I can take pictures, if needed. The service manual is here.
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
PostPosted: Sat Jun 25, 2011 12:48 pm    Post subject: Reply with quote
They WILL work.
Try testing output transistors for shorts. Any DC across speaker terminals?
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