1. Set the maximum and minimum power to 45% and test.

2. If the color is still purplish, check the current value of the laser power supply. If the current value is too low (less than 5mA).

• Unplug the laser control terminal (6-pin terminal) on the laser power supply.
• Press the test button on the power supply or the test button on the external ammeter (if available) to see the current value.

• If the current value is still less than 5mA, see Ceramic resistor test>> to sort out the faulty components.
• When the current value reaches approximately 10mA and the laser tube emits the laser normally, measure the voltage between the IN and GND ports of the laser power supply control terminal with the PULSE button pressed. The normal voltage should be around 2V. If the voltage is normal, replace the laser power supply with a new, identical one. If the voltage is too low, replace the mainboard with a new, identical one.