Google translate:
My Ipod has stopped recognizing my speaker clock radio Sony ICF-DS15iPN and do not know how to face it again
Did it stop after an iOS update? Sometimes an iOS update breaks compatibility.
Have you went to Sony's support site?
Sometimes this works
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
iOS: Back up and restore your iOS device with iCloud or iTunes
- Restore to factory settings/new iOS device.