I have a QA-10 bought used about 10 years ago. Occasionally I would get this Y02 System alarm 0051 000C. It would just go away. Now it's here to stay. Mitsubishi wants $2450.00 to register a machine that was built in 2000 before they will tell me anything. Surely somebody else has had this problem. I'm not afraid to look under the hood but with no schematics it's a little tough. I've already checked for loose connections unplugged and plugged every connector at least 10 times. I really need this machine running. Any information would be greatly appreciated.
You can email me at scressley@gmail.com

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