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KDC-BT742U/ KDC-X493/ KDC-MP442U
Troubleshooting Guide
Some functions of this unit may be disabled by
some settings made on this unit.
! • Cannot set up the subwoofer.
• Cannot set up the low pass filter.
• No output from the subwoofer.
▲
• <Subwoofer output> of <Basic Operation> (page 4)
is not set to On.
! • Cannot register a security code.
• Cannot set up Display.
▲
<Demonstration mode Setting> (page 19) is not
turned off.
What might seem to be a malfunction in your unit
may just be the result of slight misoperation or
miswiring. Before calling service, first check the
following 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 from
the 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 one
plays instead.
✔ The specified CD is quite dirty.
☞ Clean the CD, referring to the CD cleaning of the
section on <Handling CDs> (page 3).
✔ The disc is loaded in a different slot from that
specified.
☞ Eject the disc magazine and check the number
for the specified disc.
✔ 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, referring to the CD cleaning of
the section on <Handling CDs> (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 adjusted
independently. Adjust it during hands-free talk.
“MENU” > “MIC GAIN” and “NR LEVEL” <Function
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 the
hands-free talk mode.
? No beep is heard at reception of an incoming call.
✔ No beep is heard depending on the type of your
cell-phone.
☞ The “MENU” > “CALL BEEP” of <Function Control>
(page 6) is set ON.
? Voice is not recognized.
✔ The vehicle window is open.
☞ If the surrounding noise is large, voice cannot be
recognized properly. Close the vehicle windows
to reduce noise.
✔ Small voice.
☞ If voice is too small, it cannot be recognized
properly. Speak into the microphone a little more
loudly and naturally.
✔ The person uttering the voice tag is not the one who
registered the it.
☞ Only the voice of the person who registered the
voice tag can be recognized.
The messages shown below display your
systems condition.
TOC ERROR: • No disc has been loaded in the disc
magazine.
• 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 press
the reset button on the unit. If the “ERROR
99” code does not disappear, consult your
nearest service center.
IN (Blink): The CD player section is not operating
properly.
➪ Reinsert the CD. If the CD cannot be
ejected or the display continues to flash
even when the CD has been properly
reinserted, please switch off the power
and consult your nearest service center.