Kenwood KMR-550U User Manual - Page 40

Troubleshooting guide Some functions of this unit may be disabled by some settings made on this unit. ! • Cannot set up display. ▲ The demonstration mode is not turned off as mentioned in (page 36). ! • Cannot set the "Text Select", "Side Select", or "Status" setting for the "Display Select" item. ▲ A display type is not selected as mentioned in (page 28). ! • Cannot set up the subwoofer. • Cannot set up the low pass filter. • No output from the subwoofer. ▲ "SubWoofer" is not set to ON as mentioned in (page 8). ! Cannot set up the subwoofer phase. ▲ "LPF SubWoofer" is set to "Through" as mentioned in (page 8). What might seem to be a malfunction in your unit may just be the result of a slight operation error or a wiring error. Before calling for service, first check the following table for possible problems. General ? The key beep does not sound  The Preout jack is in use.  The key beep cannot be output from the Preout jack. ? • Sound cannot be heard. • T he unit does not turn on. • Information shown on the display is incorrect.  The connectors are dirty.  Clean the connectors. Refer to (page 4). Tuner source ? Radio reception is poor.  The car antenna is not extended.  Pull the antenna out all the way. Disc source ? The specified disc does not play, but another one plays instead.  The specified CD is quite dirty.  Clean the CD with reference to (page 4).  The disc is severely scratched.  Try another disc instead. Audio file source ? The sound skips when an Audio file is being played.  The media is scratched or dirty.  Clean the media with reference to (page 4).  The recording condition is bad.  Play the media again or use another media. 78 | KDC-X896/ KDC-BT852HD/ KDC-X496/ KDC-452U/ KMR-550U Contents English | 79