Communications System - Kirby Morgan 77 Operation And Maintenance Manual

Kirby Morgan 77
®

8.15 Communications System

8.15.1 General
The communications system in Kirby Morgan hel-
mets requires regular attention and maintenance for
proper function. Clear two way speech communica-
tions between the diver and the surface crew is one
of the most important capabilities of surface sup-
plied diving operations.
8.15.2 Earphone Inspection
To service the earphones, first remove the head cush-
ion from the helmet. The earphones can be carefully
pulled out of the retainers in the helmet shell for
inspection and disassembly.
1) Remove the (clear) cover first and slide it along the
wire to get it out of the way. Remove the earphone
protector and then peel back the (black) rear cover.
2) Check the wire connections. They should be solid.
Comm Module
Comm Post
The components of the communications system are shown here in exploded view.
150
Waterproof Connector
Earphone
Washer
Nut
Wiring Harness
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Removing the rubber cover from the earphone.
3) Check the mylar diaphragm. If the mylar is torn or
loose, replace the entire unit, see "8.15.6 Earphone
And Wire Assembly Replacement" on page 153.
4) If the rubber covers are worn or damaged, replace
them also.
Ferrule Terminal
Packing Gland
Nut
O-ring
Microphone
O-ring
Comm Nut
Comm Module
Cover
Screw
Nut
Washer