Lectrosonics MM400c - Manual (Page 8)

MM400C
LECTROSONICS, INC. 8
Controls and Functions
Preventing Internal Corrosion
It is very important that you properly dry the transmitter
when it becomes wet due to immersion or high levels of
perspiration BEFORE opening any covers or connec-
tors. Follow the procedure below for best results:
1. Carefully blot the transmitter dry with a clean paper
towel or cloth. Remove all moisture. After open-
ing any connector or cover, carefully blot up any
remaining moisture that may have remained around
the seal.
IMPORTANT! DO NOT CLOSE ANY COVER
OR CONNECTOR BEFORE MAKING CERTAIN
THERE IS NO MOISTURE IN OR NEAR THE
OPENING.
2. After use, it is important to store the transmitter
in a dry place with all access compartments and
connectors opened to allow any internal humidity to
evaporate. Specifically, open the Battery Compart-
ment, the Frequency Switch Cover Plate and fully
unscrew and remove the microphone connector
before storing. Do not store wet and do not store
sealed. If moisture is sealed inside the unit it has
nowhere to go other than to chemically react with
and destroy components and the printed circuit
board.
3. Lubricate all rubber O-rings with petroleum jelly
(such as Vaseline) after each use (included with
transmitter and O-ring replacement kits). DO NOT
USE ANYTHING OTHER THAN PURE PETRO-
LEUM JELLY. Silicone-based lubricants will dis-
solve the rubber. Failing to lubricate the O-rings
after each use will significantly shorten their life.
Power ON/OFF Switch
A waterproof, magnetic Power ON/OFF switch is
located on the unit’s side panel. The switch actually
consists of two components. A magnetically actuated
internal component and a magnet housing assembly.
The switch is designed so that the unit will still operate
if the Switch Magnet Housing Assembly is missing or
removed.
The function of the Power ON/OFF Switch can also be
changed so it operates as an audio mute switch. (See
Operating Instructions, Power Switch Function Selec-
tion.) These functions are illustrated in the chart below:
Power Switch Position
Function ON OFF
Normal, or Applies Power Turns Unit Off
Power Mode to Unit
Audio Mute Turns On Audio Mutes Audio
Mode
If the MM400C Power ON/OFF Switch has been con-
figured for Audio Mute Mode, it is still possible to turn
off the transmitter without removing the battery. This
is done by placing the switch in the ON position, then
toggling the switch between the ON and OFF position
three times in less than five seconds, i.e., ON (Starting
Position)-OFF-ON-OFF-ON-OFF.
The user-selected configuration of the Power ON/OFF
switch is stored in memory and persists until reconfig-
ured by the user.
Power LED
The PWR LED provides an indication of the battery’s
condition. The PWR LED glows green when the battery
is good. The color changes to red when there is about
30 minutes of operation left with the recommended
lithium battery. (An alkaline battery will have about 20
minutes of life left.) When the LED begins to blink red,
there are only a few minutes of life left in the battery.
The PWR LED blinks red for a short period when the
transmitter is configured for Normal Mode and the
Power ON/OFF switch is set to OFF. At the end of the
power off sequence, then PWR LED extinguishes.
Note: A NiMH battery gives little or no warning
when it is depleted. If you use NiMH batteries in
the MM400C, we recommend trying fully charged
batteries first, noting the length of time that the
batteries will run the unit, then plan for somewhat
less time to determine when the battery needs to
be replaced. Some Lectrosonics receivers have
timers for use with these batteries.
A weak battery will sometimes cause the PWR LED to
glow green immediately after being put in the unit, but
will soon discharge to the point where the LED will blink
red or shut off completely.
Microphone Jack
Frequency Select
SwitchThumbscrew
and Cover Plate
Audio Level Control
Antenna
Battery
Compartment
Cap
Power ON/OFF Switch
(External Switch Magnet
Housing Assembly Shown.)