Fantasea F400D User Manual - page 17
17
Note 1:
The F400D lens port uses 2 O-rings (one Radial O-ring and one
Compression seal O-ring) for a watertight seal. Radial O-rings are
affected by friction when closing the seal as it rubs against a housing
wall. Compression O-rings are not affected by friction as there is no
movement or rubbing against any wall. It is a direct face-to-face seal.
Therefore a radial O-ring, such as the O-ring on the port, requires
lubrication.
Note 2
Lubrication of an O-ring does not improve the seal. It only reduces the
amount of friction on the O-ring when it is being moved into sealing
position. The amount of lubrication required on the port O-ring is only
enough to allow it to slip into place without friction, so it does not twist or
become dislodged. More grease is not better, and could in some cases
have a negative affect if it is applied in large amounts to form a build-up
that could trap any debris or foreign matter.
Note 3
The Latching Buckles:
Provides water tight closure to the housing. The 3 Stainless Steel
buckles have a safety latch lock which should be manually pressed into
the lock position and then carefully checked to ensure that the buckle
cannot open by mistake during the dive. This can be checked by
physically trying to open the latch without depressing the lock release. If
the latch does open then you must try again to lock it down so it cannot
open
Open Housing:
Release all three latches at same time, and lift off back half to open housing.
Opening the levers- To overcome the friction of opening, two levers are
used to push against the lid with a cam action. See picture attached.
Important!
Be sure they are inserted all the way flat to the
housing before turning to avoid damaging the
protrusions on the lid.