1 Check the power supply

1. Check whether the power supply wiring is normal.

2. Confirm the power supply specification. For details, see [Attachment: CO2 Laser Power Supply and Water Cooler Configuration Table].

3. Measure whether the power supply has normal output.

2 Check the control system

1. Check and confirm whether the signal cable is properly connected.

2. Confirm whether the controller outputs PWM signals.

3. Use a voltmeter to detect whether there is a 0-5V output voltage between PWM and GND when a signal is given.

3 Check the cooling system (Water- cooled laser sources）

1. Confirm the specifications of the chiller. For details, see [Attachment: CO2 Laser Power Supply and Chiller Configuration Table]

2. Ensure that the pipeline connection for the chiller is normal and the water flow is unobstructed. When the chiller is not switch on, a rise in temperature inside the chamber can trigger the laser’s overheat protection program and potentially affect its performance.

Please ensure proper water usage. It is recommended to add a water protection wiring to the lasers. The specific wiring method is as follows:

Display Condition	Alarm code	Buzzer	OUT H1、H2	OUT   H1、H3
Circulating pump works properly			Disconnection	Breakover
Ultrahigh room temperature alarm	E1	Sounds	Disconnection	Breakover
Ultrahigh water temperature alarm	E2	Sounds	Breakover	Disconnection
Ultralow water temperature alarm	E3	Sounds	Breakover	Disconnection
Ambient temperature sensor failure	E4	Silent	Disconnection	Breakover
Water temperature sensor failure	E5	Sounds	Breakover	Disconnection
Sensor type flow alarm	E7	Sounds	Breakover	Disconnection
Chiller power failure			Breakover	Disconnection

13.4 Lasers protect program(M series laser sources）

To prevent the laser circuit board chips from being burned due to immediately signal emission after the laser is powered on, DAVI LASER has loaded a protection program that allows normal control of beam emission only after the lasers has been powered on for 1 minute.