Alpine HDS-990 HDS-990 Owners Manual - Page 32

The sound is not output from the speakers.  The built-in amplifier is not outputting a signal. The built-in power amplifier switch has been switched to "On". When this Message Appears During operation, various information will be displayed on the screen. In addition to telling you the current status or providing information on the next step of the operation guide, there are also the following error prompts. If one of the error prompts is displayed, the operation instructions given in the solution column should be carefully executed. USB transfer error  Communication failure or start-up failure, etc. -The problem can be solved by closing/opening ACC. Device does not support  A USB device that is not supported by this machine is connected. - Connect USB devices supported by this machine, such as U disk, mobile hard disk or USB HUB. No response from the device  The USB device does not respond. - Please plug and unplug the USB again. Please insert the USB  The USB storage is not connected. - Make sure that the USB storage is properly connected and the cable is not bent excessively. No song  There are no songs (files) stored in the USB memory. - Connect the USB memory device after storing the song (file). This file format is not supported  A file that is not supported by this machine is used. - Use files supported by this unit, such as "mp3", "wma", "acc", "m4a", "wav", "flac", "ape", "dsd" ("dff" and "dsf") extensions Name of the file. Protected file  Played a copy-protected WMA file. - Only files without copy protection can be played. Device not connected  The Bluetooth device is not connected. - Connect Bluetooth devices. No song  There is no song in the Bluetooth device. - Please download the song to the Bluetooth device. 29 EN