Documentation-Laser cutter-K40

insLaserK40.txt - Oct. 8, 2019 Instructions for the K40 laser cutter (cheap Chinese laser cutter): 1. Make sure the laser cutter POWER switch (top panel) is in the OFF position (bottom side down) 2. Make sure the float switch with 2 ping-pong balls in it is in the bucket in the cabinet under the laser cutter 3. Make sure the pump is in the bucket 4. Make sure the end of the 2nd plastic tube (drain line from laser tube) is in the bucket 5. If water in the bucket does not push the ping-pong balls up so they close the switch at the top of the float switch add water until they do 6. Make sure the pump is plugged into the power strip at the top right in the cabinet 7. Make sure the power cord for the laser cutter (coming down into the right rear of the cabinet) is plugged into the power strip 8. Make sure the power strip is switched on 9. Plug the power cord into the back (right side) of the laser cutter 10. Plug in (an extension cord will probably be needed) the white power cord coming out of the top of the cabinet under the laser cutter 11. Lift the 2nd plastic tube slightly out of the bucket, make sure water is flowing out of it, & replace it 12. Make sure the SAFTIES switch is in the ON position 13. Place the material to be cut in the laser cutter 14. Switch the laser cutter POWER switch ON 15. For manual operation set the CONTROL switch to MANUAL 16. Turn the LASER CURRENT knob all the way counterclockwise (off) 17. Push the LASER switch to the FIRE position (it will only fire as long as it is held there) 18. Turn the LASER CURRENT knob clockwise until the LASER CURRENT meter reaches the correct level (maximum is about 15mA) 19. When finished turn the LASER CURRENT knob all the way counterclockwise 20. Turn the POWER switch OFF 21. Unplug the power cord from the back of the laser cutter 22. Unplug the white cord coming out of the top of the cabinet Specifications - K40 power supply - Oct. 8, 2019 The power supply for the K40 (cheap Chinese laser cutter) is a "4-6-4" type with a 6-terminal connector in the center with a 4-terminal connector on both sides. L1=G - ground (typically connected to negative terminal of laser tube, in this case thru a current meter (laser current on front panel)) L2=G L3=AC - one side of 120VAC power L4=AC - other side of 120VAC power C1=G C2=P - enable - ground to allow laser to fire C3=L - laser - ground to fire laser C4=G C5=IN - intensity - analog laser power control (i.e., in manual mode) C6=5V R1=24V R2=G R3=5V R4=L - laser - ground to fire laser Note that C3 & R4 are connected on the power supply PC board as are C6 & R3. The laser power can be controlled using L by PWM. Note: Diode D15 has been disconnected because it was leaky; it was only used for an on-board TEST button which is never used so there is no particular reason to replace it.