Cleaning And Maintenance - 3M Peltor LiteCom MT53H7 4602-NA Series Manual

EN
to switch the headset on or off. A voice message will confirm
that the unit has been switched on or off. The last setting is
always saved when the headset is switched off.
Note! Power is switched off automatically if the product has
been inactive for two hours. Automatic power-off is indicated
by a voice message, "automatic power off", followed by a
series of short tones for 10 seconds, then the unit is switched
off.
Scrolling through the menu
Press the On/Off/Mode button (A:9) briefly to browse through
the menu. A voice message confirms each step.
Radio volume (sound level for communication radio)
Press the + button (A:10) or – button (A:11) to adjust the
volume to one of five levels. Each change is confirmed by
a voice message. To turn the volume off, press the – button
(A:11) for two seconds. This is confirmed by the message
"radio volume off". Press the + button (A:10) to switch this
function back on.
Note! No radio communication can be heard when the
volume is switched off.
Note! When the volume is switched off the other menus will
not be available.
Channel (radio frequency)
Press the + button (A:10) or – button (A:11) to select bet-
ween 22 available channels. Each change is confirmed by a
voice message. See table N for radio channel frequencies.
VOX (voice-operated transmission)
VOX enables LiteCom to transmit automatically when sound
above a certain level reaches the microphone. This allows
radio transmission without pressing the PTT button (A:14).
Press the + button (A:10) or – button (A:11) to adjust the
sensitivity of voice-operated transmission. Each change is
confirmed by a voice message. You can choose between five
levels or switch this function off. When the level is low it is
easier to transmit. To switch this function off, press the – but-
ton (A:11) for two seconds. This is confirmed by the message
"VOX off". The PTT button (A:14) must now be used to trans-
mit. Press the + button (A:10) to switch this function back on.
Alternatively, switch voice-operated transmission on or off
by briefly pressing the PTT button twice. A voice message
confirms the current VOX setting.
The radio has a Busy Channel Lock Out (BCLO) function that
prevents VOX operation if the channel is being used for other
transmission. An audible tone indicates that the channel is
already being used.
Note! To activate the VOX function, the speech microphone
(A:8) must be very close to your mouth, 1–3 mm (figure L).
The user's voice will be heard in the headset when the radio
is transmitting.
Squelch (hiss reduction)
"Squelch" means that background hiss in the earphones is
prevented when the incoming signal is below the set squelch
level. Press the + button (A:10) or – button (A:11) to adjust
10
the squelch level. Each change is confirmed by a voice
message. You can choose between five levels or switch this
function off. A low squelch level may permit longer range. To
switch this function off, press the – button (A:11) for two se-
conds. This is confirmed by the message "squelch off". Press
the + button (A:10) to switch this function back on.
Sub channel (selective squelch)
Sub channel allows multiple groups of users to use the same
channel without hearing other groups. When sub channel is
active, an inaudible code will be transmitted with speech, and
this code is used to "open" the receiver of other users of the
group. This allows multiple groups of users to use the same
channel without hearing other groups. This product supports
Continuous Tone Coded Squelch System (CTCSS), which
means there are 38 codes which have been assigned the
numbers 1–38 (table D, CTCSS). All communication on a
channel can be heard if this function is switched off.
Note! When the sub channel function is switched on, all
other incoming radio communication will be blocked. Press
the + button (A:10) or – button (A:11) to select the sub
channel. Each change is confirmed by a voice message. You
can choose between 38 tones or switch this function off. To
switch this function off, press the – button (A:11) when sub
channel 1 is selected, or press the + button (A:10) when sub
channel 38 is selected. This is confirmed by the message
"sub channel off". Press the + button (A:10) to switch this
function back on.
PTT (Push-To-Talk)
Press and hold the PTT button (A:14) to transmit manually
using the radio. PTT transmission works at any time, regard-
less of BCLO (Busy Channel Lock Out, see 3.6 VOX).
Reset to factory defaults
To restore the default settings, switch off the unit. Then press
and hold the + (A:10) and – (A:11) buttons at the same time
while also pressing the (A:9) On/Off/Mode button. This is
confirmed by the voice message "restore factory defaults".

CLEANING AND MAINTENANCE

Use a cloth wetted with soap and warm water to clean the
outer shells, headband and ear cushions.
NOTE: Do NOT immerse the hearing protector in water.
If the hearing protector gets wet from rain or sweat, turn the
earmuffs outwards, remove the ear cushions and foam liners,
and allow to dry before reassembly. The ear cushions and
foam liners may deteriorate with use and should be examined
at regular intervals for cracking or other damage. When used
regularly, 3M recommends replacing the foam liners and ear
cushions at least twice a year to maintain consistent attenu-
ation, hygiene, and comfort. If an ear cushion is damaged, it
should be replaced. See Spare Parts Section below.
REMOVING AND REPLACING THE EAR CUSHIONS
K:1 To remove the ear cushion, slide your fingers under the
inside edge of the ear cushion and firmly pull straight out.