Sony CDX-GT570UP Operating Instructions Manual page 30

CHEK ANT (Check Antenna)
 The antenna (aerial) is not being used
properly.
– Make sure the antenna (aerial) is connected
and being used properly.
CHK TUNR (Check Tuner)
 The SiriusXM Vehicle Tuner is not
functioning properly.
– Disconnect the SiriusXM Vehicle Tuner,
and connect it again.
NOSIGNAL (No Signal)
 The service is stopped due to a signal
interruption.
SUBSCRIPTION UPDATE - ENTER TO
CONTINUE
 Your subscription has been updated.
– Press .
If these solutions do not help improve the
situation, consult your nearest Sony dealer.
If you take the unit to be repaired because of
CD playback trouble, bring the disc that was
used at the time the problem began.
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