Nakamichi NGXA80.4, Руководство пользователя

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10 EN
No Function:
● The connection cable is not connected correctly (=te12V/GND/REM). Ensure that
all connections and mechanic contact and that the jacket has been removed. The fuse is
defective-pay attention to the correct value of a new fuse!
No Sound :
● Speaker cable or speaker plug are not connected correctly.
No Sound / Red LED Protection is on:
● The plus and minus wires of the speaker cable have contact, thus eliminate the short
circuit. If you use a 2 Ohm speaker in stereo mode, a 4 Ohm speaker in bridge mode or
tri-mode and the set is overloaded, then turn the gain control to "min" until the operation is
free of trouble.
Poor Sound Quality (Distortions) :
● The speakers are overloaded, therefore turn down the volume level and check the
volume control positions.
No Stereo Sound And A Weak Bass :
● Speaker cables (+) and (-) are mixed up, unit wired out of phase.
HOW TO PROCEED IN CASE OF FAULTS
All cables can source and create interference. The power cable and Cinch/RCA audio
cable are very prone to interference; the remote cables are less prone. There is often
interference caused by the generator (piping), ignition (cracking) or other car electronic
parts. Most of these problems can be eliminated by correct and careful cabling. In doing so,
here are the following guidelines:
● Use only a screened audio cable for the wiring between "low level in" of the amplifier and
RCA or DIN output of the radio.
● Lay the signal, speaker and power cables separately with enough distance from one
another and also from each other car cable. If not possible, you can lay the circuit and
ground cable together with the serial cables. Audio and speaker cable should be as far
away from these as possible. The REM cable to the automatic antenna output of the radio
can be laid together with the signal cables.
● Avoid ground loops by laying the ground wiring of all components to a center point in a
starlike way. You can find the best central point in measuring the voltage directly at the
battery. Now compare this voltage value with the chosen ground point and the(+) terminal
of the amplifier. If measured voltage is only slightly different, you've found the correct
central. Otherwise you have to look for another point. You should measure with the ignition
point for earth being switched on and additionally switched on consumers (rear window
heating and light).
● If there are pickups from external electrical sources into the speaker cables, divide the
core leads and twist them together.
● If there are noises from the car electrics, add an interference suppression choke into the
power wiring.
● If there are humming noises, use thicker ground cables or add further ground cables to
the chassis.
● To reduce contact resistance and bad and loose contacts, please solder the cable ends
or use multi core cable ends, spade terminals or others. Gold Plated spade terminal are
free of corrosion and have the lowest contact resistance.
● Should all these measures be without any success, the use of a ground loop isolator may
solve the problem.
INTERFERENCE