This is my personal repair experience for Marantz 2230. Since there is no detailed information regarding how to replace the light bulb, so I tried by removing the face plate at first as same as I did on other Marantz receivers. But it ends up the easiest way is to do it from top of light socket inside of receiver. I think this video may help other DIY fans when replacing lamps on their unit to avoid the mistake I made.
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