Troubleshooting - Lectrosonics DHu Instruction Manual

Troubleshooting

SYMPTOM
TRANSMITTER WILL NOT POWER ON
MODULATION LEDs DO NOT LIGHT
MODULATION LEDs INDICATE BUT NO SOUND
RECEIVER RF INDICATOR OFF
NO SOUND BUT RECEIVER AUDIO LEVEL METER INDICATES SOUND
DISTORTED SOUND
HISS AND NOISE -- AUDIBLE DROPOUTS
EXCESSIVE FEEDBACK
Rio Rancho, NM
POSSIBLE CAUSE
1) Batteries are inserted backwards.
2) Batteries are dead, or too low to be used.
1) Audio Gain set too low.
2) Mic capsule is damaged or malfunctioning. Try a different capsule
or contact the factory for repair.
1) Talkback function is engaged (release the button on the housing).
See p. 10.
2) Check receiver display for audio level indication
3) Receiver on wrong frequency or wrong band.
4) Receiver connected incorrectly to sound system.
5) Transmitter in standby mode.
1) Transmitter not turned on.
2) Transmitter is in "standby" (non-transmitting) mode. Check the
LCD for the antenna/transmission icon status.
3) Batteries are dead or installed backwards.
4) Receiver antenna missing, defective or improperly positioned.
5) Transmitter and receiver not on the same frequency.
6) Operating range is too great.
7) Receiver antenna missing, incorrect frequency or disconnected.
1) Receiver audio is muted. (Unmute receiver.)
2) Receiver audio output levels set too low.
3) Receiver audio output is disconnected or cable defective
or mis-wired.
4) Sound system or recorder input level is turned down.
1) Transmitter Audio Gain set too high. Speak or sing into the
transmitter and check the Audio Level LEDs and/or Audio Level
bar graph in the transmitter LCD and corresponding indicators on
the receiver.
2) Receiver output level may be too high for the sound system or
recorder input.
3) Excessive wind noise or "breath pops." Microphone may require
an additional wind screen.
4) Mic capsule damaged or defective
1) Transmitter Audio Gain set too low. See page 9 for proper audio
gain setting.
2) Receiver antenna missing, defective or obstructed.
3) Operating range too great.
4) Interference may be present. Turn transmitter off and observe the
RF level indicator on the receiver. Change frequency if necessary.
5) With Lectrosonics HHC or HHVMC: return attenuator control
back to default setting of "F" (see opposite page), then readjust
audio gain per instructions on page 9.
1) Transmitter Audio Gain set too high. Check level adjustment,
reduce receiver output level, or both.
2) Microphone too close to speaker system.
3) Move microphone closer to the user's mouth and lower the
sound system volume.
Digital Hand Held Transmitter
15