Re: Merc-o-tronic repair help. Home › Forum › Ask A Member › Merc-o-tronic repair help. › Re: Merc-o-tronic repair help. foodclubReplies: 4Topics: 3 October 25, 2018 at 2:46 pm #84960 quote debe: If this is the same circuit board, then check for 5V dc on pin 8 of the NE555 ic as shown for a start. Nope, No Circuit Board. 🙁