Lectrosonics UDR200a - Manual (Page 8)

TROUBLESHOOTING
POWER SUPPLY AND FUSE
LEDs not lit or dimly lit — When the UDR200 is powered from an
external DC supply, the LEDs are dimmed to conserve battery life.
• AC power cord disconnected.
• External power supply disconnected or inadequate.
• Main power supply fuse blown.
• For 110 Volt operation: 315 mA, 250 Volt
Buss GDC-315 or Littlefuse 218.315
(Lectrosonics part #22090)
• For 220 Volt operation: 160mA, 250 Volt
Buss GDC-160 or Littlefuse 218.160
(Lectrosonics part #22091)
• Rear panel voltage selector incorrectly set.
PILOT TONE SQUELCH
The PILOT indicator lamp on the front panel lights up to indicate
that the audio has been turned on at the transmitter, and that the
audio output on the receiver is enabled. When the lamp is on, the
audio is on. When the lamp is off, the audio is muted.
PILOT lamp on, but no sound
• Audio output cable bad or disconnected. Try monitoring at the
headphone output on the front panel. The headphone out­
put signal is taken just ahead of the output transformer.
• AUDIO OUTPUT level set too low.
PILOT lamp off, 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 lamp does not come on 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 re-oriented
• Improper length of antenna, or wrong antenna. UHF whip
antennas should be about 5 to 6 inches long. VHF whip anten­
nas should be about 14 to 20 inches long.
• Operating frequency is outside the passband of the receiver.
Check the frequency range of the unit and be sure the frequency
switches are not set beyond the limits of the receiver. (See step
11 on page 7 for more info.)
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 re-positioning 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 UDR200 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 UDR200 and
lowering the input gain on the device the UDR200 is feeding.
Distortion
• Transmitter input gain too high. Check and/or re-adjust 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 UDR200 front panel.
• Audio output level too high for the device the UDR200 is
feeding.
8