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
Summary of Contents for NVS 6
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