Communications System; General; Earphone Inspection - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

Fig. 6.11 Use a pair of pliers and a rag to tighten the
nose block device knob.
6.4

COMMUNICATIONS SYSTEM

6.4.1 General

The communications system in the Kirby Mor-
gan Band Mask 18A/B and 28 requires regular
attention and maintenance for proper function.
Clear two way speech communications between
the diver and his surface crew is one of the most
important capabilities of surface supplied diving
operations.
Communications may be either two wire or four
wire. See Section 6.4.5 on four wire systems.

6.4.2 Earphone Inspection

To service the earphones, remove the hood (2)
from the Band Mask first (see Section 5.4 for
hood removal and replacement). The earphones
(10, 11) can be carefully pulled out of the hood (2)
for inspection and disassembly.
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KMB 18 & 28 MANUAL
1) The rubber front cover is removed first, the rear
cover is next removed. The protector is now free.
2) Check the wire connections. They must be
solid.
Fig. 6.12 Removing the rubber cover from the earphone.
3) Check the Mylar diaphragm. If the mylar is
torn, or loose, replace the entire unit. Although
cardboard speakers are available at a lower initial
cost than our mylar speakers, they are a poor
investment. Cardboard speakers must be re-
placed almost five times as often as our mylar
speakers. Cardboard speakers should only be
used when genuine Kirby Morgan speakers can-
not be obtained.
4) If the rubber covers are not good, replace them
also.
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