Using a 2.0mm Allen key, loosen the six screws securing the back cover.
Using a 2.5mm Allen key, remove the two marked screws securing the bottom cover of the printer. Remove the bottom cover.
Remove the hot glue securing the cables and remove the cables.
Using a 2.0mm Allen key, loosen the four securing screws. Remove the constant current board.
Prepare the new constant current board. Alignit with the screw holes and put it in the installation position. Using a 2.0 mm Allen key, tighten the four screws securing the constant current board.
Insert the cables on the two sides of the contant current board. Align the back cover with the screw holes and install it.
Using a 2.0mm Allen key, tighten the six screws securing the back side. Using a 2.5mm Allen key, tighten the marked two screws on the bottom cover.
Power on the printer and the UV llight works normally. The replacement completes.