Lectrosonics MM400c User Manual download pdf (Page 17)

Watertight Miniature UHF Belt-Pack Transmitter

Rio Rancho, NM

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

1) Batteryisinsertedbackwards.

  2) Batteryisdead.

  3) PowerON/OFFswitchconguredtoNormalModeandis

   settoOFF.

 1) VerifyTransmitterPWRLEDisglowing.

  2) Gaincontrolturnedallthewaydown.

  3) Miccapsuleisdamagedormalfunctioning.

  4) Miccabledamagedormis-wired.

 1) PowerON/OFFSwitchisconguredforAudioMuteModeand

   theswitchisintheOFF,ormuteposition.(SeeControls and

Functions.)

 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switches/displayontransmitterandreceiver.

  5) Operatingrangeistoogreat.

1) Receiveroutputlevelsettoolow.

 2) Receiveroutputisdisconnected;cableisdefectiveorconnectors

not wired correctly.

  3) Soundsystemorrecorderinputisturneddown.

  4) Receiver/Transmittercompatibilitymodemismatched.

  5) Transmitteraudiomuted.

 1) Transmittergain(audiolevel)isfartoohigh.CheckModulation

LEDs on transmitter and receiver as it is being used. (See

Operating Instructions, Attaching a Microphone and Adjusting

Audio Levels.)

  2) Receiveroutputmaybemismatchedwiththesoundsystemor

recorder input. Adjust output level on receiver to the correct level

   fortherecorder,mixerorsoundsystem.

  3) Excessivewindnoiseorbreath“pops.”Repositionmicrophone

   and/orusealargerwindscreen.

  4) Transmitterisnotsettosamefrequencyasreceiver.Checkthat

frequency select switches on receiver and transmitter match.

  5) Receiver/Transmittercompatibilitymodemismatched.

 1) Transmittergain(audiolevel)fartoolow.

  2) Receiverantennamissingorobstructed.

  3) Operatingrangetoogreat.CheckRFlevelonreceiverindicator.

 1) Transmittergain(audiolevel)toohigh.Checkgainadjustment

   and/orreducereceiveroutputlevel.

  2) Transmittertooclosetospeakersystem.

  3) Micistoofarfromuser’smouth.

Troubleshooting

TRANSMITTER PWR LED OFF

NO TRANSMITTER MODULATION LEDs

-10 MODULATION LED IS BLINKING

GREEN AND RECEIVER HAS NO AUDIO

RECEIVER INDICATES NO RF

NO SOUND (OR LOW SOUND LEVEL),

RECEIVER INDICATES PROPER AUDIO

MODULATION

DISTORTED SOUND

HISS AND NOISE -- AUDIBLE DROPOUTS

EXCESSIVE FEEDBACK

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Lectrosonics MM400c User Manual Page 17

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