Lectrosonics M175DC - Manual (Page 6)

M175
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:
Transmitter battery LED off 1) Unit turned off. Check front panel on/off slide switch.
2) Battery is inserted backwards.
3) Battery is dead.
Receiver 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 1) Transmitter audio muted (M175-LS only)
mod level LEDs are off 2) Microphone or input cable defective.
No sound but receiver 1) Receiver audio is muted. Refer to receiver manual.
mod level LEDs are on 2) Receiver audio output is disconnected or cable is defective
or mis-wired.
3) Sound system or recorder input is turned down.
Distorted sound 1) Transmitter gain (audio level) is too high. Speak or sing into the
transmitter and check mod level lamps on the receiver
(see Operating Instructions.)
2) Receiver output may be mis-matched with the sound system
or recorder input.
3) Excessive wind noise or breath “pops.”
Hiss and noise -- Audible dropouts 1) Transmitter gain (audio level) too low.
2) Receiver antenna missing or obstructed.
3) Operating range too great.
Excessinve feedback 1) Transmitter gain (audio level) too high. Check gain adjustment
and/or reduce receiver output level (see Operating Instructions.)
2) Transmitter too close to speaker system.
3) Move transmitter closer to the user’s mouth.
Specifications and Features
Operating frequencies: 150 to 216 MHz Battery Indicator:
RF Power Output: 50 mW Battery Life:
Deviation: ±15kHz Controls:
Spurious Radiation: 50dB below carrier
Frequency Stability: ±0.005% only)
Equivalent Input Noise: -123dB Size:
Input Sensitivity: 8mV to 1.6V for full modulation Weight:
Input Compressor: Soft Compressor; 12dB range FCC ID:
Electret Bias: +5 Volt DC (positive bias)
Antenna: Input cord or microphone body Emission designator:
Input Jacks: Twist-lock micro for electret
microphones
Specifications subject to change without notice.
LED indicates battery condition
Approximately 15 hours
Power on/off slide switch
Recessed audio gain control
Mute on/off toggle switch (M175-LS
1.3 x 2.35 x 3.7 inches
6.6 ozs with battery and microphone
DBZM175 (150 to 172 MHz)
DBZM175A (174 to 216 MHz)
58K0F3E
LECTROSONICS, INC. 6