Kirby Air Conditioner 5 User Manual download pdf (Page 17)

KMACS 5 MANUAL

2.5.2 TESTING COMMUNICATIONS

Test the communications between the diver and the

KMACS 5. With the communicator (R) switched

on, turn the speaker switch to “on” and adjust the

volume to a comfortable level for both the diver

and the KMACS 5 operator. In the 2 wire mode,

the communicator functions similarly to a citizens

band radio; i.e., the KMACS 5 operator must de-

press the push to talk switch to speak to the diver.

In the 4 wire mode, the communicator functions

like a telephone conference call; i.e., everyone on

the line can hear and speak to everyone else. In

either mode, for the diver to talk top side, it is only

necessary for him to speak into the oral/nasal mi-

crophone in his mask or helmet. If two divers will

be working together, test the cross-talk functions

at this time as well.

To extend the life of the battery, it is recommended

that the communications be used in the 4 wire mode.

Operation as a 2 wire system uses relays inside the

unit which will cause a higher battery drain.

CAUTION: In the 2 wire mode, when the

push-to-talk switch is depressed, the

KMACS 5 operator should keep all of his

communications short (10-15 seconds) at

any one time. This allows the diver to call

for assistance if necessary.

Plug the earphone connectors on the diver’s umbili-

cal into the earphone jacks on the communicator.

Plug the microphone connectors on the umbilical

into the microphone jacks on the communicator.

This will create a 4 wire system/round robin system.

Test the system and adjust all volume controls.

Unplug the earphone connectors on the diver’s um-

bilical from the communicator and reinstall them in

the connectors attached to the plugs for the micro-

phone. This will change the communicator to a 2

wire system. Test this system and adjust volumes.

If there are no communications, recheck all of the

connections to ensure they are tight at each junction.

If the KMACS 5 has been operating in a coastal en-

vironment, look for corrosion on the top side connec-

tors which may interfere with the communications.

If corrosion is evident, disassemble the connectors,

clean, and retest. If corrosion is heavy, replace the

top side connectors.

Substitute other masks or umbilicals to test for

failures in the microphones or umbilical. Substitute

one piece of new gear at a time to track the fault

down. If the fault is in the mask or helmet, replace

the earphones or microphones as needed.

If the fault is in the umbilical, disconnect the umbili-

cal and carefully inspect its length for damage. Look

for obvious nicks or cuts.

If there is physical damage to the outside of the

communications wire there probably is a break on

the inside, too. Test the continuity of the wire end-to

end with a volt-ohmmeter.

Uncoil the umbilical and lay it out ﬂat with the two

ends close to each other. Set the volt-ohmmeter to

resistance (ohms) and hold one probe to one prong

on an umbilical connector plug and touch the other

probe from the meter to the wires (or connector) at

the opposite end of the diver’s umbilical. Upon locat-

ing the other end of the same wire, the meter should

indicate zero resistance, i.e., there is a complete,

uninterrupted circuit. If touching none of the wires

at the other end of the umbilical produces a zero

reading and all readings are inﬁnity (∼), this indicates

a complete break in the wire. If the reading is some-

where between zero and inﬁnity, and changes as the

umbilical is moved, this indicates a partial break, and

communications will be intermittent. In either case,

a waterproof splice must be made in the wire.

Fig. 8 Preliminary testing of the umbilical with a volt-ohm

meter to check for continuity.

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