Lectrosonics FM870 - Manual (Page 14)

TROUBLESHOOTING
Before going through the following chart, be sure that you have a good battery in the transmitter. It is
important that you follow these steps in the sequence listed.
SYMPTOM POSSIBLE CAUSE
FM870 POWER LAMP NOT ON OR DIM 1) Power/function switch in OFF position
2) Batteries completely discharged
3) Battery connections loose
TRANSMITTER BATTERY LED OFF 1) Transmitter power switch off.
2) Battery is inserted backwards.
3) Battery is dead.
FM870 RF LAMP OFF 1) Transmitter not turned on.
2) Transmitter battery is dead.
3) Receiver antenna missing or improperly positioned.
4) Transmitter and receiver not on same frequency.
Check labels on transmitter and receiver.
5) Operating range is too great.
NO SOUND AND RECEIVER MOD LEVEL LEDs ARE OFF
1) Transmitter in not getting an audio signal.
2) Defective mic or mic cable.
3) Transmitter gain control set much too low.
4) Transmitter audio muted. Check to see that the
audio is not muted on your transmitter, if this feature
is available on your model transmitter.
NO SOUND BUT RECEIVER MOD LEVEL LEDs ARE ON
1) FM870 power/function switch set to SPEAKER OFF
position.
2) WIRELESS or AUX MIC VOLUME control turned
completely down.
3) Sound system or recorder input is turned down.
4) Defective speaker
DISTORTED SOUND 1) Transmitter gain (audio level) is too high. Speak into
the transmitter and check mod level lamps on
transmitter and receiver. See page 10.
2) Receiver output may be mis-matched with the sound
system or recorder input.
3) Excessive wind noise or breath "pops."
4) FM870 batteries very low - recharge.
HISS AND NOISE -- AUDIBLE DROPOUTS 1) Transmitter gain (audio level) too low.
2) Receiver antenna missing or obstructed.
3) Operating range too great.
EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high. Check gain
adjustment and/or reduce receiver output level.
2) Microphone too close to speaker system. Move
transmitter closer to the user’s mouth.
13