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NVS 6
MANUAL
Page 43
Trouble
and
symptoms
Probable
cause
Remedy
Remarks
sical damage repair at Manu-
facturer’s
facilities
3 One of the
image-intensifier
tube screens is
not illuminated.
Visible on the
screen are black
dots that tend to
grow to a
dimension of a
segment
1 The
image-
intensifier tube
is unser-
viceable
1 Forward the unit
for repair
To be
performed at a
repair shop or
at Manu-
facturer’s
facilities
4 With the unit
energized, drops
of moisture are
visible on optical
surfaces in the
field of vision of
the eyepiece
1 Moisture
has got inside
the unit (failure
of the eye-
piece sealing)
1 Replace
dehydrator cartridge
(13) (Ref. Fig. 5.1),
by first inspecting
the color of silica gel
indicator through
the sight glass (14).
Replace silica gel
Can be
performed in
the field