Troubleshooting Guide - Kenwood Z-638 Instruction Manual

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.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
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 faceplate does not open or
The faceplate is incorrectly attached.
Reattach the faceplate correctly, See the section on <Removing
the Faceplate>(page 12).
?
The memory is erased when the ignition is turned
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
Connect the wire correctly, referring to the section on
<Connecting Wires to Terminals>.
pressed.04
close.09
OFF.10
connected.11
?
The TEL mute function does not
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.
?
The Bass center frequency, Bass quality factor, Bass extend, Middle
center frequency, Middle quality factor, and Treble center frequency
can't be adjusted.19
The <System Q> (page 27) is set OFF.
Set it ON.
?
No sound can be heard, or the volume is low.
The fader or balance settings are set all the way to one
Center the fader and balance settings.
The input/output wires or wiring harness are connected
Reconnect the input/output wires or the wiring harness correctly.
See the section on <Connecting Wires to Terminals>.
The values of Volume offset are
Increase the values of Volume offset. (page 8)
The <Built-in Amp Mute Setting> (page 27) is
Turn it OFF.
?
The sound quality is poor or
One of the speaker wires is being pinched by a screw in the car.
Check the speaker wiring.
The speakers are not wired
Reconnect the speaker wires so that each output terminal is
connected to a different speaker.
— 36 —
work.15
side.21
incorrectly.22
low.24
ON.100
distorted.25
correctly.27