Step 1

Unscrew with cross head
screw driver.

Step 2
Remove the mainboard
cover.

Step 3

Press SW1 button to
start auto test.

Step 4

Use multimeter to test
the voltage of output for
compressor.

Step 1

Unscrew with cross head
screw driver.

Step 2

Remove the mainboard
cover.

Step 3

Disconnect the terminals.

Step 4

Loosen the buckle.

Step 5

Take out mainboard.

Reverse above steps to
install a new board.