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Troubleshooting Guide
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.
The fuse has blown.
After checking for short circuits in the wires,
replace the fuse with one with the same
rating.
rating.
Speaker cable touches on chassis etc.
Wire or insulate the speaker cable properly
and press the reset button.
?
There’s a source you can’t switch.
There’s no media 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.
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.
The ignition and battery wire are incorrectly
connected.
Connect the wire correctly, referring to the
section on 'Connecting Wires to Terminals'.
?
The TEL mute function does not work.
The TEL mute wire is not connected properly.
Connect the wire correctly, referring to the
section on 'Connecting Wires to Terminals'.
section on 'Connecting Wires to Terminals'.
The 'TEL Mute' (page 25) is OFF.
Turn it ON.
?
The TEL mute function turns ON even though the
TEL mute wire is not connected.
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.
?
No sound can be heard, or the volume is low.
The fader or balance settings are set all the way to
one side.
Center the fader and balance settings.
Center the fader and balance settings.
The input/output wires or wiring harness are
connected incorrectly.
Reconnect the input/output wires or the
wiring harness correctly. See the section on
'Connecting Wires to Terminals'.
'Connecting Wires to Terminals'.
The cassette tape is bad.
Try playing another cassette tape. If works fine,
the first tape was bad.
The values of Volume offset are low.
Turn up the Volume offset, referring to the
section on 'Audio Control' (page 10).
section on 'Audio Control' (page 10).
The 'Built-in Amp Mute Setting' (page 25) is ON.
Turn it OFF.
?
The sound quality is poor or distorted.
One of the speaker wires is being pinched by a
screw in the car.
Check the speaker wiring.
Check the speaker wiring.
The tape head is dirty.
Clean the tape head.
The speakers are not wired correctly.
Reconnect the speaker wires so that each
output terminal is connected to a different
speaker.
?
The Touch Sensor Tone doesn’t sound.
The preout jack is being used.
The Touch Sensor Tone can’t be output from
the preout jack.
?
The Dimmer function doesn’t work.
The Dimmer wire isn’t connected correctly.
Check the Dimmer wire connection.
Tuner source
?
Radio reception is poor.
The car antenna is not extended.
Pull the antenna out all the way.
Pull the antenna out all the way.
The antenna control wire is not connected.
Connect the wire correctly, referring to the
section on 'Connecting Wires to Terminals'.
?
The desired frequency can’t be entered with the
Direct Access Tuning.
A station that can’t be received is being entered.
Enter a station that can be received.
You’re trying to enter a frequency with a 0.01 MHz
unit.
What can be designated in the FM band is to
0.1 MHz.
1.DPX-MP4070̲M̲US.indd
04.3.12, 3:02 PM
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