24 | KDC-W4544U/ KDC-W4644U/ KDC-W4044U/ KDC-W413UTroubleshooting GuideSome functions of this unit may be disabled bysome settings made on this unit.! • Cannot set up the subwoofer.• Cannot set up the low pass filter.• No output from the subwoofer.▲ • of (page 4)is not set to On.• Preout is not set to subwoofer. ☞ “SWPRE” of! • Cannot register a security code.• Cannot set up Display.• Power OFF Timer does not function.▲ (page 15) is notturned off.What might seem to be a malfunction in your unitmay just be the result of slight misoperation ormiswiring. Before calling service, first check thefollowing table for possible problems.General? The Touch Sensor Tone does not sound.✔ The preout jack is being used.☞ The Touch Sensor Tone cannot be output fromthe preout jack.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 oneplays instead.✔ The specified CD is quite dirty.☞ Clean the CD, referring to the CD cleaning of thesection on (page 3).✔ The disc is loaded in a different slot from thatspecified.☞ Eject the disc magazine and check the numberfor the specified disc.✔ The disc is severely scratched.☞ Try another disc instead.Audio file source? The sound skips when an Audio file is beingplayed.✔ The media is scratched or dirty.☞ Clean the media, referring to the CD cleaning ofthe section on (page 3).✔ The recording condition is bad.☞ Record the media again or use another media.