If the laser power appears weakened

1. Set the power to 100%.
2. Set the ammeter at the rear of the engraver to the maximum.
3. Test again and check the current value on the LCD.

If the laser tube is emitting laser beaming as usual and the ammeter reads about 20 mA current, the laser tube and the power supply are working fine. In such a case, if the power appears weakened (to be specific, the engraving results are undesirable or an appreciably degraded engraving result has been noticed),

1. Check the focal lens and mirrors for any grime or smudge. Refer to Cleaning the lens and mirrors>> for details.
2. Check whether the laser path is perfectly aligned along all three mirrors and the laser tube. Refer to  Laser path alignment>> for details. 

If the laser tube is emitting laser normally, but the ammeter reads lower than 15 mA, check the laser control signal on the power supply using the steps below:

• Draw a circle of 50mm in diameter in the software.
• Set the power to 100% and the speed to 1.
• Use the software to move the laser head to the leftmost corner of the workbed.
• Set the switch at the upper-left corner of the engraver's to enable the rotary axis.
• Launch the engraving through the software.
• Open the bottom cover of the laser power supply (refer to the video).

• Measure the voltage between the IN and the GND terminals of the laser power supply. Normally the reading is 5V.

1. If the voltage is normal, replace the laser power supply with a new, identical one.
2. If the voltage is lower than 5V.

• Open the right glass lid (refer to the video).

• Check the continuity between these two ports of the potentiometer (as shown).

If the ports test conductive, replace the mainboard. If the ports test open, replace the potentiometer with a new, identical one.

If the laser tube is not emitting a laser beam and the ammeter reads lower than 4 mA, connect the cathode and anode wires of the laser tube (as shown).

• Press the test button on the power supply and read the current value on the ammeter. If the current reads about 8 mA, replace the laser tube with a new identical one. If the current still reads low, replace the laser power supply with a new identical one.