Sennheiser 500 Series If a problem occurs

Cleaning the devices

If a problem occurs ...

EM 500

Problem	Possible cause	Possible solution
Receiver cannot be oper-	Lock mode is activated	Deactivate the lock mode (see page 22).
ated, “Locked” appears
on the display panel
No operation indication	No mains connection	Check the connections of the mains unit.
No RF signal	Transmitter and receiver are not on the	Set the transmitter and receiver to the same
	same channel	channel. To do so, use the synchronization
		function (see page 21).
	Transmitter is out of range	Check the squelch threshold setting
		(see page 26).
		Reduce the distance between transmitter and
		receiving antennas.
RF signal available,	If “TX Mute” additionally appears on the	Cancel the muting (see page 23).
no audio signal,	display panel:	Switch the pilot tone transmission on the trans-
“MUTE” appears on the	transmitter is muted (“MUTE”)	mitter on (see page 28).
display panel	or	Switch the pilot tone evaluation on the receiver
	transmitter doesn’t transmit a pilot tone	off (see page 27).
	Receiver’s squelch threshold is adjusted	Reduce the squelch threshold (see page 26).
	too high	Reposition the antennas.
Audio signal has a high	Transmitter sensitivity is adjusted too	Adjust the transmitter sensitivity correctly
level of background noise	low/high	(“Sensitivity”, see page 28).
Audio signal is distorted	Transmitter sensitivity is adjusted too	Adjust the transmitter sensitivity correctly
	high	(“Sensitivity”, see page 28).
	Receiver’s audio output level is adjusted	Reduce the audio output level
	too high	(“AF Out”, see page 27).
No access to a certain	During scanning, an RF signal has been	Set the transmitter operating on this channel to
channel	detected on this channel and the channel	a different channel and redo the frequency
	has been locked	preset scan (see page 27).
	During scanning, a transmitter of your	Switch the transmitter off and redo the
	system operating on this channel has	frequency preset scan (see page 27).
	not been switched off
None of the diversity	Receiver’s squelch threshold is adjusted	Reduce the squelch threshold (see page 26).
displays I or II appears on	too high
the display panel	Transmitter’s RF signal is too weak	Increase the transmission power of the
		transmitter.
		Reduce the distance between transmitter and
		receiver.
	Antennas are not connected correctly	Check the antenna cables or the antennas.
During the soundcheck,	One of the antennas is not connected	Check the antenna cable or the antenna.
only one diversity display	correctly
(I or II) appears on the	Antennas are not optimally positioned	Reposition the antennas.
display panel

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