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R-4106.A
REPAIR ANO ADJUSTMENT
1.
Unclear
shadows
ap1>91.1r
in
the
viewiield
during
observation
2. Brightness fall-off in
the
circumferen~
of
viewfield
REPAIR ANO ADJUSTMENT
(B,
F,
ER
and
UW-tube)
1.
Unclear Shadows Appear
in
the
Viewfield During Observation
Cause:
(
1)
Finger marks,
large
dust
or
other dirt remain on the light incidence or exit surface
ot
prism
@
(@
and
@)
(other part numbers added
in
parenthesises
in
this
way
means
those
used
for
UW-tube).
(2) Separation
of
light retlecting silver layer on the prism.
(3)
Crack
in
the prism.
< Repair and Adjustment >
ln
the
case
of
(!)
......
Wipe
off dirt
usmg
a
doth
or
lens
tissue soaked with a triíle of absolute alcohol
( ethanol
or
methanol).
ln the
case
of
(2) or (3) ......
Replace
the prism.
Procedure
1)
Referring
to
Disassembly procedure (P.22, 23), disassemble
the
depression prism unit.
2)
C1ean
prism
@
(@
and @).
3)
For replacement, strike out the prism @
C@)
and @) with a wooden hammer.
Stick the
new
one.
4)
When
replacing,
do
positioning
of
the
new
prism, referring to adjustment
(P.
40 - 42
and
46).
2.
Brightneu
Fall-off in
the
Circumferenca
of
Viewfield
Cause: Incorrect positions
of
prism 1§
(@
and
G9
)
< Repair
and
Adjustment >
Make
positional adjustment.
Procedure
Refer to the procedure mentioned above
in
l.
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