An update, the motor was seized and I couldn't make it work again and I couldn't find a replacement. If you want this box as a spares machine let me know.I own the black European version M-CD40 , certainly one of the best sounding little boomboxes out there , the white version is lovely !
Here are some info from a Japenese book that I have :
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The google translation leaves much to be desired but the basic info is there :
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I have serviced mine but I wouldn't mind to have a service manual , if only the price was (much) better.
https://www.ebay.com/itm/113713055882