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FM Radio failing/AM is ok 900 1995

posted by  turbocrow on  Fri May 3 14:23 CST 2002
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The FM is failing intermittently in my radio. The AM is fine. I read this in the FAQ:
" The problem with no FM in most all Volvo radios is probably an ignition noise suppressor diode package in the antenna circuit. (Failed shorted) A fifty cent part. From the schematic symbol silk screened on the circuit board it is a switching diode pair. Removal brings the FM back as long as the engine is off. The spark plug pulses suppress the gain control circuits and the radio won't work well on the road without this diode package.
The part id is AG 20 and the name is TAIYO"

Could someone please give me a clue as to where the diode is located in relation to the antenna circuit? Is it located with the radio unit, or back in the trunk with the antenna? I would love to take care of this myself. I stopped in a car radio place, and the guy was totally clueless. (I have a 1995 940T)






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