Aqua Lung CALYPSO Maintenance Manual page 5

Calypso/Titan Second Stage Service Manual
4. While holding the second stage secure, firmly grasp the
collar of the front cover (1) which is seated over the venturi
control switch (9), opposite of the inlet side. Stretch the col-
lar over the venturi control switch, and lift the front cover off
the box bottom (4) until the opposite collar can be removed
from the inlet fitting (13). Closely examine the front cover to
check for any tears, distortion, deterioration, or other signs
of damage. Replace it if found, or set it aside if it is in reus-
able condition.
5. Lift out the sealing ring
(2) and diaphragm (3)
from the box bottom,
and closely inspect the
diaphragm to ensure that
it is perfectly round and
free of any tears, deterio-
ration, or other damage. If
deterioration or damage
is found, discard the
diaphragm and do not
attempt to reuse.
6. Once the front cover (1) has been removed, the release
latch for the exhaust valve cover (11) becomes exposed.
Using your finger, lift the release latch and swing the ex-
haust valve cover off of the lugs on the box bottom (4).
7. Inspect the exhaust valve
and its seating surface
underneath. The valve
should be clean and
supple. It should be free of
any tears, holes or defects
of any kind. It should have
well defined edges. If it is
dirty or compromised in
any way, it must get replaced. The seated surface under-
neath the valve must be clean.
8. Using your finger, reach
into the box bottom (4)
and remove the retain-
ing clip (7) for the venturi
switch.
9. Grasp the venturi switch
(9) between your thumb
and forefinger and pull
it straight out of the box
bottom (4).
10. Remove and discard the
O-ring (8) from the venturi
switch (9), and closely ex-
amine the O-ring groove
of the venturi switch to
check for any nicks or
scratches. Discard if
found, or set it aside if it
is in reusable condition.
11. While holding the box bottom (4) secure, apply a 3/4"
(19mm) open end wrench to the inlet fitting (13). While
depressing the lever (18), carefully turn the fitting counter-
clockwise to loosen and remove. Remove and discard the
o-ring (12).
12. Apply a medium blade
screwdriver to the slotted
head of the crown (14)
inside the inlet fitting (13),
and hold the inlet fitting
secure while turning the
crown counter-clockwise to
disengage the threads.
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