Lectrosonics UDR200b - Manual (Page 16)

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 exter­
nal 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 prob­
lem, 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 prob­
lem is not in the transmitter.
• If noise is still present when the transmitter is turned off,
try lowering the audio output level on the UDR200B 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 UDR200B
and lowering the input gain on the device the UDR200B 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 UDR200B front panel.
• Audio output level too high for the device the UDR200B is
feeding.
• Transmitter is 100kHz (one switch position) off from the
receiver frequency.
UDR200B REPLACEMENT PARTS and ACCESSORIES
Part No. Description
A500RA Right angle, flexible whip UHF antenna
21499 Replacement AC power cord
RMP200-1 Rack mount kit for single UDR200B receiver
RMP200-2 Rack mount kit for two UDR200B receivers
Optional Remote Antennas
AY3U-550 3-element YAGI, +4.5dBD, 500 to 600 MHz range
AY3U-650 3-element YAGI, +4.5dBD, 600 to 700 MHz range
AGPU UHF ground plane, 470 to 608 MHz range
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