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D3 Lazer Power Green Too Low


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I have a d-lab3 which keeps giving 'lazer power green too low' have changed the lazer to a spare one which I presume is ok and get 'laser power blue too low', tried another laser and the same message comes up. Have tried two other fibres and tried realigning the fibre at both ends but am struggling to get the monitor diode g/b up to 2000, the values fluctuare wildly, am suspecting it could be the laser power supply, have tried a spare one I have but not sure how good the spare supply is, any thoughts? Laser power is 790mv, 5.2A, its old but seems to light and work.

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