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English

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 power does not turn ON.01
✔The fuse has blown.
☞After checking for short circuits in the wires, replace the fuse with
one with the same rating.
✔No ACC position on vehicle ignition.02
☞Connect the same wire to the ignition as the battery wire.
?If you have selected Standby mode, the power will go OFF
automatically.03
✔The Power OFF Timer function has been activated.
☞If you do not want the power to go OFF automatically, cancel the
Power OFF Timer function.
?Nothing happens when the buttons are pressed.04
✔The computer chip in the unit is not functioning normally.
☞Press the reset button on the unit (page 4).
?There’s a source you can’t switch.06
✔There’s no CD inserted.
☞Set the media you want to listen to. If there’s no media in this
unit, you can't switch to each source.
✔The Disc changer isn’t connected.08
☞Connect the Disc changer. If the Disc changer isn’t connected to
it's input terminal, You can't switch to an external disc source.
?The memory is erased when the ignition is turned OFF.10
✔The battery wire has not been connected to the proper terminal.
☞Connect the wire correctly, referring to the section on
<Connecting Wires to Terminals>.
✔The ignition and battery wire are incorrectly connected.11
☞Connect the wire correctly, referring to the section on
<Connecting Wires to Terminals>.
?There’s no loudness effect.12
✔You’re using Non-fading preout.
☞Loudness has no effect in Non-fading preout.
?The Non-fading output can’t be turned ON or OFF.14
✔The <Switching Preout> (page 27) is set is set on Rear preout.
☞Change it to Non-fading preout.
?The TEL mute function does not work.15
✔The TEL mute wire is not connected properly.
☞Connect the wire correctly, referring to the section on
<Connecting Wires to Terminals>.
?The TEL mute function turns ON even though the TEL mute wire is
not connected.16
✔The TEL mute wire is touching a metal part of the car.
☞Pull the TEL mute wire away from the metal part of the car.
?Even if Loudness is turned ON, high-pitched tone isn't compensated
for. 17
✔Tuner source is selected.
☞High-pitched tone isn't compensated for when in Tuner source.
?No sound can be heard, or the volume is low.
✔The fader or balance settings are set all the way to one side.21
☞Center the fader and balance settings.
✔The input/output wires or wiring harness are connected incorrectly.22
☞Reconnect the input/output wires or the wiring harness correctly.
See the section on <Connecting Wires to Terminals>.
✔The values of Volume offset are low.24
☞Increase the values of Volume offset. (page 10)
?The sound quality is poor or distorted.25
✔One of the speaker wires is being pinched by a screw in the car.
☞Check the speaker wiring.
✔The speakers are not wired correctly.27
☞Reconnect the speaker wires so that each output terminal is
connected to a different speaker.
?The Security Code item isn’t displayed in the Menu System.32
✔The Security Code function is already activated.
☞When the Security Code function is activated it isn’t displayed in
the menu items.
?The Touch Sensor Tone doesn’t sound.34
✔The preout jack is being used.
☞The Touch Sensor Tone can’t be output from the preout jack.
Troubleshooting Guide
KDC-MV6521(E)_U.S r4.5 02.10.8 2:26 PM Page 34