Hi everyone!
Hope this may help someone.
I purchased a Redsail M500 laser engraver completed the assembly but couldn't get the laser to fire! After asking the eBay supplier for help and got nowhere except sending me a schematic with the suggestion I fix it myself! Nevertheless, I traced the problem to the water flow sensor and the water flow one way valve, the valve was intermittently sticking, and the sensor was not picking up the flow to complete the laser power circuit, anyway, I sorted it out and now after the alignment procedure am happy with the machine!

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