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— 32 —
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.
? 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.05
✔ There’s no tape inserted.
☞ Set the media you want to listen to. If there’s no media in this
unit, you can't switch to each source.
✔ 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> (page 30).
✔ The ignition and battery wire are incorrectly connected.11
☞ Connect the wire correctly, referring to the section on
<Connecting Wires to Terminals> (page 30).
? 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> (page 30).
✔ The cassette tape is bad.23
☞ Try playing another cassette tape. If works fine, the first tape was
bad.
? 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 tape head is dirty.26
☞ Clean the tape head.
✔ The speakers are not wired correctly.27
☞ Reconnect the speaker wires so that each output terminal is
connected to a different speaker.
? Non-fading setting can’t be done.28
✔ The <Switching preout> (page 24) is set on Rear preout.
☞ Set it on Non-fading preout.
? The text is not scrolled.31
✔ This is because eight or less characters are displayed.
☞ If all the characters are displayable on the display part, the text is
scrolled once when the display switches, and after that, the text
is not scrolled.
? The Security Code item isn’t displayed in the Function System.32
✔ The Security Code function is already activated.
☞ When the Security Code function is activated it isn’t displayed in
the Function 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.
? Even though the vehicle light switch is turned ON, the unit’s display
won’t dim.36
✔ The dimmer wire isn’t connected.
☞ Connect the dimmer wire correctly.
? The display color changes subtly. 38-2
✔ This is because the temperature is different than the temperature
when the setting was done.
☞ The display color condition changes subtly according to the
ambient temperature.
Troubleshooting Guide
DPX-MP4050(M-TKR)(E) 2003.02.14 09:03 AM Page 32