marantz 2225 stereo light

If the stereo light is actually good, the most common problem is alignment. The tuning meter has a relationship to the ratio detector- if the ratio detector is out of alignment, the correct setting of the meter may not be at the peak. If the unit has this problem, it may not be able to detect the stereo subcarrier, thus the stereo lamp will not light.

So alignment is the first thing to check. For this you need actual test equipment- an FM Stereo generator for starters.

I cant get stereo light to go on in fm mode. installed new bulb which works only in tape/phono/aux. Im a novice at this. wondering if Im stuck in mono. I've sprayed the inside switches. mono light works in other modes but does not sound like it works in fm. please advise your thoughts.

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good luck,

Azjake