Cable / connection issue

Check and reseat the wire unit between the LCB (J407) and the Peltier Control Board (J101). Replace if necessary.

malfunction Peltier Control Board

Replace the Peltier Control Board. See "Replacing the Peltier Controller".

malfunction LCB

Replace the Laser Control Board (LCB). See service procedure "Replacing the Laser Control Board (LCB)"