8.LASER OPTICAL SYSTEM B-70315EN/02
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(c) When the pressure of the vacuum system of the oscillator is
lower than the atmospheric pressure, the rear mirror may be
sucked, making it difficult to remove the rear mirror. Check that
the oscillator is in the purge state, and loosen the blind joint on
the top of the turbo blower to allow the internal pressure of the
vacuum system to equalize with the atmospheric pressure.
(d) Loosen the mirror holding screw, then remove the mirror holder
from the mirror stage.
Fig.8.2.1(c) Exploded view of the rear mirror
(e) Remove the rear mirror from the mirror holder, then place the
rear mirror on lens cleaning paper. Check the removed O-rings.
Replace an O-ring that is damaged or has lost elasticity.
Proceed to step (l) to replace the mirror.
(f) Gently blow clean air by using a camera blower across the mirror
surface to remove dust and dirt.
(g) Drip ethyl alcohol or lens cleaner onto the mirror surface, and
gently wipe dirty areas by using a cotton swab moistened with
the fluid.
(h) Place lens cleaning paper on the mirror, then spray ethyl alcohol
or lens cleaner over the paper and mirror. Then, move the lens
cleaning paper horizontally to and fro across the mirror.
(i) Remove any fiber dust by blowing clean air with a camera
blower.
(j) Repeat Steps (g) through (i) until all dirt on the mirror surface is
removed. Finally, clean the mirror surface with ethyl alcohol.
(k) Clean the back surface of the mirror similarly.
(l) Wipe the mirror holder and O-rings with ethyl alcohol.