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Chapter 6 Common Fault Treatment
（3）Inspect whether other optical lens are clean, such as red light
combiner, galvanometer, field lens.
（4）Inspect whether optical output is covered or not and make sure the
isolator output terminal and galvanometer are at grade when installing.
（5）Power loss out of laser operation lasting 20,000 hours is normal
phenomenon.
（6）There may be breakage while marking result from signal interference
or ground connection incorrectly. The leads of weak and strong current
cannot be linked together or at the same side. Use the signal wire with
shielded function.
（7）Make sure the pulse duration, frequency are set within the specified
range.
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