TM 5-4220-225-14
Table 2-7. Postdive Procedures (Cont).
Step
Procedure
8.
EXHAUST VALVE
The helmet is stowed with the adjustable valve in place, fully opened, for
STOWAGE
cleanliness and valve body protection.
PREPARATION
a. Remove the chin button.
b. Line up the valve handle cutout with the two cover assembly screws
and remove the screws.
c. Remove the cover assembly, spring, and poppet assembly.
d. Remove the diaphragm retainer and diaphragm.
e. Remove the diffuser.
f. Wash all parts with freshwater and wipe or blow dry.
g. Lightly lubricate the poppet preformed packing.
h. Reassemble for the adjustable exhaust valve assembly in preparation
for helmet stowage.
i.
Stow adjustable exhaust valve in fully open position to reduce spring
tension and the possibility of flattening the poppet disc preformed
packing.
2-19. Divers Intercommunications Set. The divers intercommunication set, figure 2-14, is an intercommunication
system between a surface tender and one, two, or three divers. Divers voices are continuously received by the surface
tender. The surface tender can communicate with all divers through the controls on the front panel.
a.
Operation. There are several options available in how the unit is operated. The tender can use either the speaker
(combination reproducer/microphone) mounted in the unit's front panel or the headset (furnished with the unit) for
communication with the divers. The divers' communications cables can be connected to the unit using either banana
jack receptacles on the front panel or the deep sea connectors located on the rear panel, figure 2-14.
(1) Turn-on procedures. To turn the unit on, rotate the TENDER VOL switch to the ON position. The LOW VOLTS
lamp will flash once and then extinguish. This signifies that the unit is on and ready for operation. Should the lamp
remain illuminated, the battery voltage is low and the battery pack should recharged.
(2) Normal communication procedures. To use the internal speaker, flip the SPKR ON-OFF switch to the ON position.
When the TENDER VOL switch is rotated clockwise, the volume of diver's voice(s) being monitored will increase. There
is also a volume control for the diver's earphones. When the DIVERS VOL switch is rotated clockwise, the volume in the
diver's earphones will increase.
2-53
