General - Kenwood NX-720 Service Manual

NX-720
3. PLANNING THE INSTALLATION

3-1. General

Inspect the vehicle and determine how and where the ra-
dio antenna and accessories will be mounted.
Plan cable runs for protection against pinching or crush-
ing wiring, and radio installation to prevent overheating.
3-2. Antenna
The favored location for an antenna is in the center of a
large, flat conductive area, usually at the roof center. The
trunk lid is preferred, bond the trunk lid and vehicle chassis
using ground straps to ensure the lid is at chassis ground.
3-3. Radio
The universal mount bracket allows the radio to be
mounted in a variety of ways. Be sure the mounting surface
is adequate to support the radio's weight. Allow sufficient
space around the radio for air cooling. Position the radio
close enough to the vehicle operator to permit easy access
to the controls when driving.
3-4. DC Power and wiring
1. This radio may be installed in negative ground electrical
systems only. Reverse polarity will cause the cable fuse
to blow. Check the vehicle ground polarity before installa-
tion to prevent wasted time and effort.
2. Connect the positive power lead directly to the vehicle
battery positive terminal. Connecting the Positive lead to
any other positive voltage source in the vehicle is not rec-
ommended.
3. Connect the ground lead directly to the battery negative
terminal.
4. The cable provided with the radio is suffi cient to handle
the maximum radio current demand. If the cable must be
extended, be sure the additional wire is suffi cient for the
current to be carried and length of the added lead.
4. INSTALLATION PLANNING – CONTROL STATIONS
4-1. Antenna system
The antenna system selection depends on many fac-
tors and is beyond the scope of this manual. Your KEN-
WOOD dealer can help you select an antenna system that
will best serve your particular needs.
4-2. Radio location
Select a convenient location for your control station radio
which is as close as practical to the antenna cable entry
point. Secondly, use your system's power supply (which sup-
plies the voltage and current required for your system). Make
sure suffi cient air can fl ow around the radio and power sup-
ply to allow adequate cooling.
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and align-
ment procedures contained in this manual.
4
GENERAL / 概述
3. 安装的步骤
3-1. 概述
检查车辆并确认如何以及在何处安装无线电天线和附件。
安排好电缆的位置，避免挤压或碾碎布线，同时无线电设
备避免过热。
3-2. 天线
天线的最佳位置应该在一个宽阔，平整导电区域的中心，
通常在车顶的中心。行李箱的盖子更好，将地线黏结在行李
箱的盖子和车辆的外壳上确保行李箱盖子接地。
3-3. 无线电设备
通用安装托架允许以多种方法安装无线电设备。确认安装
的表面足以支撑无线电设备的重量。无线电设备的周围留出
适当的空间进行散热。将无线电设备尽可能的安装在靠近车
辆操作者的位置上，以便在驾驶时易于控制。
3-4. 直流电源和布线
1. 本无线电设备只能被安装在负极接地电子系统中。反向极
性将导致电缆保险丝熔断。在安装之前检查车辆的接地极
性，避免工作效率低以及浪费时间。
2. 将电源的正极引线直接连接到车载电池的正极端点上。不
要将正极引线与车辆上的其他正极电压连接。
3. 将接地引线直接与电池的负极连接。
4. 与无线电设备一起提供的电缆适用于所需的最大无线电电
流。如果电缆必须加长，要确认附加的电线适用于所载的
电流和添加引线的长度。
4. 安装步骤 - 基站
4-1. 天线系统
天线系统的选择取决于许多因素和本手册的范围。用户的
KENWOOD 销售商可以帮助用户选择最能满足用户特殊要求的天
线系统。
4-2. 无线电位置
为用户的基站无线电设备选择一个方便的位置，此位置应
尽量靠近天线电缆输入点。其次，使用用户系统的电源 ( 为
用户的系统提供所需的电压和电流 )。确认无线电设备周围的
空气流通顺畅并且足以使电源冷却。
维修服务
为了便于维修本设备，建立了完整的维修服务体系，提供
了包括原理图，印刷电路板图和调整步骤在内的资料供参考。