Troubleshooting - Lectrosonics M187 Operating Instructions And Troubleshooting Manual

Before going through the following chart, be sure that you have a good battery in the transmitter the red power LED
on the transmitter panel should glow brightly.
SYMPTOM
TRANSMITTER BATTERY LED OFF
NO TRANSMITTER MODULATION LEDs
VERY SHORT OPERATING DISTANCE
NO SOUND IS HEARD AND
RECEIVER RF LAMP IS OFF
NO AUDIO IS HEARD BUT RECEIVER
RF LED IS ON
NOTE: If the modulation level
LEDs on the receiver are
indicating properly, the problem
is NOT in the transmitter.
NO SOUND AND RECEIVER
MOD LEVEL LEDs ARE OFF
NO SOUND BUT RECEIVER
MOD LEVEL LEDs ARE ON
NOISE (HISS) IS HEARD ALONG
WITH THE SIGNAL
DISTORTED SOUND
EXCESSIVE FEEDBACK

TROUBLESHOOTING

POSSIBLE CAUSE
1) Battery is inserted backwards.
2) Battery is dead.
1) Gain control turned all the way down.
2) Battery is in backwards. Check power LED.
3) Mic capsule is damaged or malfunctioning.
1) Mic cord not properly terminated. Shield wire may be touching the
connector shell. See page 7.
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.
1) On/Off switch is in "mute"position
receiver or transmitter.
2) Microphone on/off switch is in "off" position.
3) Volume is turned down or off on transmitter or receiver.
4) Receiver not properly connected to other audio equipment.
5) Transmitter POWER switch may be turned on and off (i.e. through
the mute position). A "thump" should be heard in the sound, again
indicating a properly functioning receiver.
1) Transmitter audio muted. Make sure front panel power
switch is in the on position.
1) Receiver audio is muted. Refer to receiver manual.
2) Receiver audio output is disconnected or cable is
defective or mis-wired.
3) Sound system or recorder input is turned down.
1) MIC LEVEL is too low.
2)Transmitter and receiver may be too far from one another.
3) Receiver antenna may be defective or disconnected.
1)MIC LEVEL is too high.
2) Mic may be distorting; try a different mic and listen again.
3)PA system may be overloading.
1) Transmitter gain (audio level) too high. Check gain adjustment
and/or reduce receiver output level.
2) Microphone too close to speaker system.
3) Microphone too far from user's mouth.
4) Sound system volume set too high.
Rio Rancho, NM – USA
Belt-Pack Transmitter
11