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Judge laser tube & laser power supply

1. Unplug the terminals that connects to motherboard.

2. Press testing switch on laser power supply to see if laser tube fire.

If fires, then both laser tube and laser power supply are ok. Problem should be from motherbord or wires connection or software setting.

If not fire, either laser tube or laser power supply has problem. Pls go to next step to judge.

3. Disconnect the connector for laser tube and laser power supply.

4. Use high-tension wire end from laser power supply to touch the machine metal wall.

If fire, the laser power supply is no problem, and laser tube is damaged.

If no fire, the laser power supply is damaged.