・When listing the item, the input selector was not responding well, so I disassembled and cleaned it. Currently, the selector is recognized properly even when turned quickly, and clear sound is produced from both left and right channels immediately after power-on. ・The terminals on the back were tarnished, so I polished all of them one by one (Image 6). They didn't become perfectly clean, but they improved to some extent, and the terminals are now easier to insert. ・After the above work, the following checks were performed: ○ Sound output: No crackling, no particular problems. ○ Selector: Selects properly even when turned quickly. ○ Sound output confirmed from input from each input source. ○ Tone control check. (Sound quality is subjective, but I don't think there are any particular problems.) ○ Left/right balance control check. ○ Basic operation confirmed with a compatible remote control. ・Recording-related functions have not been checked, only the above confirmations. ・There are some scratches as it is a used item. Please judge any concerning scratches from the photos in the latter half. ・The item is only the main unit, and there are no accessories. Since the item is also listed on other sites, please comment before purchasing.