What is z sustain board?
Buy Replacement Z-Sustain Boards at ShopJimmy. It had a bad Z-sustain board which was causing some sparking at the power supply board. All the voltages measured on the Y and Z sustain board are within the specifications as marked on boards. Previous owner replaced Z-sustain but failed to install all screws, this appears to have caused the new board to fail taking the SUS IGBTs out.