Lectrosonics SR Series - Troubleshooting Common Issues; Power On and Display Problems; Pilot Tone and Audio Signal Problems

UHF Digital Hybrid Wireless
®
Rio Rancho, NM
23
Troubleshooting
Symptom Possible Cause
INITIAL POWER ON
LCD display not active or lit 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.
Version message shows DSP or COM This indicates an internal error. Please contact the factory for
assistance.
Display indicates CHECK FREQ 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.
PILOT TONE SQUELCH
Pilot Tone indicator (P) present, but no sound (Check audio meter first)
Audio output cable bad or disconnected.
  AudioOutputleveltoolow.Usethebuilt-intesttonetoverifylevels.
Pilot Tone Indicator (P) keeps flashing when transmitter turned on
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.)
Noise on audio and Pilot Tone Indicator is “b”
The pilot tone bypass has been activated. Hold Sel and press UP
to reset (works only from the Main Window).
Pilot Tone Indicator not present but receiving audio
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.
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ashing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.