Troubleshooting - Lectrosonics SR Series Instruction Manual

Troubleshooting

Symptom
INITIAL POWER ON
LCD display not active or lit
Version message shows DSP or COM
Display indicates CHECK FREQ
PILOT TONE SQUELCH
Pilot Tone indicator (P) present, but no sound (Check audio meter first)
Pilot Tone Indicator (P) keeps flashing when transmitter turned on
Noise on audio and Pilot Tone Indicator is "b"
Pilot Tone Indicator not present but receiving audio
NOTE: In the 400 Series, 200 Series and Mode 6 compatibility modes, the PILOT indicator on the LCD shows as a solid "P" to
indicate that the audio has been turned on at the transmitter, and that the audio output on the receiver is enabled. When the "P"
is on, the audio is enabled. If the "P" is flashing the pilot tone is not detected and the audio will be muted (squelched).
In the other compatibility modes, no pilot tone is used and the "P" is never displayed. Audio is present whenever the
receiver detects a sufficiently strong signal.
Regardless of the compatibility mode, activating the "pilot tone bypass" causes a lowercase "b" to appear on the LCD
main window and forcing the squelch to open and deliver audio. When no matching transmitter is turned on, loud noise
will be present at the receiver output.
Rio Rancho, NM
Possible Cause
External power supply disconnected or inadequate.
Wrong polarity power source. The external power input jack requires
POSITIVE (+) to be on the center pin. Battery gets warm and doesn't
work.
Battery may be low. Try fresh batteries.
This indicates an internal error. Please contact the factory for
assistance.
This is a warning that a strong RF signal is present that is not
centered on the channel, and the audio is likely to be distorted.
There are three principal causes:
1) The transmitter is set to the wrong channel, but close to the
the correct channel. Check frequency setting of transmitter.
2) A foreign signal is causing the condition, such as from a local
TV station or from intermodulation from another transmitter.
Retune the receiver and transmitter to a clear frequency.
3) The transmitter carrier frequency is not correct (rare occurence).
Contact factory for repair.
If any of these solutions don't remove the warning message, the
transmitter or receiver may need repair.
Audio output cable bad or disconnected.
Audio Output level too low. Use the built-in test tone to verify levels.
Pilot tone detection can take several seconds. Turn on the transmitter
power (and the audio switch on some models) and wait 3 to 5 seconds
for the "P" to indicate steadily.
Transmitter and receiver not on same frequency.
Receiver compatibility mode does not match the transmitter in use.
(See Sel Selections from Main Window, COMPAT Window.)
The pilot tone bypass has been activated. Hold Sel and press UP
to reset (works only from the Main Window).
Receiver is set to a compatibility mode that doesn't use Pilot Tone.
Check that receiver compatibility mode matches the transmitter in use
as any sufficiently strong signal can unsquelch the receiver in this
mode, compatible or not.
UHF Digital Hybrid Wireless
®
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