Measure the voltage between the CN1's 24V on the mainboard and the Wind port with the engraver processing (as shown).

• If the voltage reads 0, replace the mainboard with a new, identical one.
• If the voltage reads 24V.

1. Set the multimeter’s beeper on.
2. Measure the continuity between the 24V of the CN1 terminal of the mainboard and the V+ of the relay.
3. Measure the continuity between the Wind of the mainboard CN1 terminal and the IN of the relay, and fix any disconnected point.
4. If the circuits turn out to be closed but the relay indicator is not turning red, replace the relay with a new, identical one.