Lectrosonics FM875 - Manual (Page 7)

TRANSMITTERS cont’d
The battery you use in the M175 Series transmitter should be a 9 Volt alkaline, available almost
everywhere. An alkaline battery will provide up to 15 hours of operation. Carbon zinc batteries, even if
marked "heavy duty" will only provide about 4 hours of operation. Make sure your batteries are marked
"alkaline." Short battery life is almost always caused by weak batteries or batteries of the wrong type.
The BATTERY LAMP will light when the transmitter is turned on and will stay lit as long as the battery is
good. As the battery voltage drops, the lamp will grow dim and finally go out. Even after the lamp goes
out, there may still be up to an hour or more of operating time remaining. When the battery voltage is too
low for proper transmitter operation, the sound from the wireless system may be distorted, intermittent or
totally absent. When the transmitter is first turned on, the lamp may light for a short while even with a bad
battery. It is good practice to check the brightness of the lamp after the transmitter has been on for several
minutes and to note the brightness occasionally during use.
Open the battery compartment as shown below. Observe the large and small holes in the battery contact
pad before inserting a new battery and orient the battery correctly. Insert the contact end of the battery
first, making sure the contacts are aligned with the holes in the contact pad, and then close the door or
replace the cover.
To open the battery
compartment door, push the
door up and away from the
case with your thumb, then
swing open.
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M175 Series
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