Lectrosonics UDR200c - Manual (Page 18)

18
TROUBLESHOOTING
POWER SUPPLY AND FUSE
Display not lit or dimly lit
• AC power cord disconnected.
• External power supply disconnected or inadequate.
• Main power supply defective.
• The External DC power input is protected by an auto-reset polyfuse.
Disconnect power and wait about 10 seconds for the fuse to reset.
Receiver won’t turn off
• This is normal when the unit is being operated from external DC power.
PILOT TONE SQUELCH
The pilot indicator is the transmitter switch settings display. When solid on, it indicates that the audio has been turned on at the
transmitter, and that the audio output on the receiver is enabled. (When the indicator is solid on, the audio is on.) When the
indicator is blinking, the audio is muted.
PILOT indicator solid on, but no sound
• Audio output cable bad or disconnected. Try monitoring at the headphone output on the front panel. The
headphone output signal is taken just ahead of the output transformer.
• AUDIO OUTPUT level set too low.
PILOT indicator blinking, but sound still comes through
• PILOT TONE BYPASS switch may have been pressed. Turn receiver power off and then back on again to
reset the audio output relays.
PILOT indicator does not stop blinking when transmitter audio switch is turned on
• It takes several seconds for the relay to actuate the PILOT lamp. Turn the transmitter power and audio
switches on and wait 2 to 5 seconds for the lamp to come on.
ANTENNAS AND RF SIGNAL STRENGTH
RF LEVEL is weak on one (or both) channels
• Antenna is disconnected or there is a bad connection
• Antenna may need to be moved or reoriented
• Improper length of antenna, or wrong antenna. UHF whip antennas should be about 3 to 5 inches long.
• Transmitter is 100kHz (one switch position) off from the receiver frequency.
One OPTI BLEND LED does not come on or is dimly lit
• DIVERSITY switch is set to one or the other channels. Needs to be in the center position for
normal operation.
• Reverse the antennas on the rear panel inputs. If the opposite OPTI-BLEND LED now indicates the same
problem, there may be an antenna or cabling problem. Try repositioning the antenna(s).
AUDIO SIGNAL QUALITY
Poor signal to noise ratio
• Transmitter gain set too low
• Noise may not be in wireless system. Mute the audio signal at the transmitter and see if noise remains. If
the noise remains, then turn the power off at the transmitter and see if it remains. If the noise is still present,
then the problem is not in the transmitter.
• If noise is still present when the transmitter is turned off, try lowering the audio output level on the UDR200C
rear panel and see if the noise lowers correspondingly. If the noise remains, the problem is not in
the receiver.
• Receiver output does not match the input of the device it is feeding. Try increasing the output level of the
UDR200C and lowering the input gain on the device the UDR200C is feeding.
Distortion • Transmitter input gain too high. Check and/or readjust input gain on transmitter according to the LEDs on the
transmitter and then verify the setting with the transmitter audio level LED strip on the UDR200C front
panel.
• Audio output level too high for the device the UDR200C is feeding.
• Transmitter is 100kHz (one switch position) off from the receiver frequency.