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When Key does not operate Check Start Y N Does LED turn on 1. Confirm AC connection in Red? 2. Confirm Power S/W ON Y N Does LED turn on 1. Check the connection to main PCB. 2. Check the main PCB or Sub PCB. in Green? Y N Is 1st and 3rd pin of Key PCB has a trouble. So, exchange Key PCB. P911A output normal? Y Check main PCB TGYZGT
