Question about Sony mz-n1 recording

My unit has been inactive for several years. I would like to resume recording, but it consistently gets stuck during data or TOC editing. I've even tried recording with the front cover open. It appears to become stuck at the beginning of the disc and doesn't advance, although playback functions correctly. I've inspected the recording head flex cable and found no damage. Could you suggest any further troubleshooting steps? Thank you for your assistance.