44 | KDC-BT742U/ KDC-X493/ KDC-MP442UTroubleshooting 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.! • Cannot register a security code.• Cannot set up Display.▲ (page 19) 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.Hands-free? The hands-free talk volume is low.✔ The hands-free talk volume is set at a low level.☞ The hands-free talk volume can be adjustedindependently. Adjust it during hands-free talk.“MENU” > “MIC GAIN” and “NR LEVEL” Control> (page6).? No sound is heard from the rear speakers.✔ You are talking in the hand-free talk mode.☞ No sound is heard from the rear speakers in thehands-free talk mode.? No beep is heard at reception of an incoming call.✔ No beep is heard depending on the type of yourcell-phone.☞ The “MENU” > “CALL BEEP” of (page 6) is set ON.? Voice is not recognized.✔ The vehicle window is open.☞ If the surrounding noise is large, voice cannot berecognized properly. Close the vehicle windowsto reduce noise.✔ Small voice.☞ If voice is too small, it cannot be recognizedproperly. Speak into the microphone a little moreloudly and naturally.✔ The person uttering the voice tag is not the one whoregistered the it.☞ Only the voice of the person who registered thevoice tag can be recognized.The messages shown below display yoursystems condition.TOC ERROR: • No disc has been loaded in the discmagazine.• The CD is quite dirty. The CD is upside-down. The CD is scratched a lot.ERROR 05: The disc is unreadable.ERROR 77: The unit is malfunctioning for some reason.➪ Press the reset button on the unit. If the“ERROR 77” code does not disappear,consult your nearest service center.ERROR 99: Something is wrong with the disc magazine.Or the unit is malfunctioning for some reason.➪ Check the disc magazine. And then pressthe reset button on the unit. If the “ERROR99” code does not disappear, consult yournearest service center.IN (Blink): The CD player section is not operatingproperly.➪ Reinsert the CD. If the CD cannot beejected or the display continues to flasheven when the CD has been properlyreinserted, please switch off the powerand consult your nearest service center.
