1. Connect the engraver to a control computer installed with RDWorks.

2. Access “Vendor param” (password: rd8888). Check that “Signal level” is set to “Low” (as shown).

If the parameter is correct.

• Open the access door.
• Check that the L-on port of the laser control terminal is connected to the L port of the laser power supply's 6-pin terminal (as shown).

If the wiring is correct, check whether the laser signal on the ammeter of the power supply is “OFF” or “ON”.

• If it is “OFF”, replace the laser power supply with a new, identical one.
• If it is “ON”, then measure the voltage between L-on and GND of the mainboard (normally 5V). If the voltage is low, replace the mainboard with a new, identical one