Sony CDX-4000X Operating Instructions Manual page 21

Radio reception
Problem
Preset tuning is not possible.
Cause/Solution
• Memorise the correct frequency.
• The broadcast signal is too weak.
• When your car has built-in FM/AM antenna in the rear/side
glass, it is necessary to connect the power antenna control
lead (blue) or the accessory power input lead (red) to the
power terminal of the existing antenna booster. For details,
consult your dealer.
Automatic tuning is not The broadcast signal is too weak.
possible. --_ Use manual tuning.
The "ST" indication flashes. • Tune in the frequency accurately.
• The broadcast signal is too weak.
--b Set to the MONO mode (page 12).
If the above-mentioned solutions do not help improve the situation, consult your nearest Sony
dealer.
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