Custom Autosound USA 740

Questions and Answers

I
Ian LopezAug 6, 2025
How to fix a Custom Autosound USA 740 that will not turn on?
- A
  Alan MorrisAug 6, 2025
  If your Custom Autosound Radio isn't turning on, displaying no lights, and producing no sound, there are several potential causes. First, check the red (switched) and yellow (constant) power leads to ensure they are properly connected and receiving voltage within the range of 12-14.7 Volts. Next, verify the black ground wire has a solid connection. Finally, inspect the fuse on the back of the radio and replace it if it's blown.
T
Todd ClementsAug 11, 2025
What to do if my Custom Autosound Radio has lights but no sound?
- M
  Michael SerranoAug 11, 2025
  If your Custom Autosound Radio displays lights but produces no sound, the issue likely lies with the speakers or speaker wires. Ensure all speakers are 4 to 8 ohms. Check that none of the speakers are going to ground and that the speaker wires are not shorting to themselves or ground.
M
Matthew WalkerAug 17, 2025
Why is sound only heard on one side of my Custom Autosound USA 740?
- R
  Roy SmithAug 17, 2025
  If sound is only coming from one side of your Custom Autosound Radio, start by checking the speaker wire connections. Ensure that the balance control is set to the center position. If the issue persists, try reversing the speaker leads at the radio. If the sound remains on the same speaker, the speaker is likely faulty. If the sound switches to the other speaker, check the wiring and fader control on the radio.
A
Amber MurrayAug 23, 2025
What to do if my Custom Autosound USA 740 lights dim and distorts at high volume?
- J
  jacquelineburgessAug 23, 2025
  If the lights on your Custom Autosound Radio dim and the audio distorts at high volume, the issue is likely a poor ground connection. Reconnect the ground wire to a solid chassis ground.
G
Geoffrey RoyAug 29, 2025
How to improve radio reception on my Custom Autosound Radio?
- N
  Natalie HernandezAug 29, 2025
  If you're experiencing noise with radio reception on your Custom Autosound Radio, the antenna may not be fully extended. Extend the antenna to its full length. Also, interference can occur. Try backing the vehicle out of the garage and testing again.

Summary

Introduction

Radio Installation

Rear Mounting Strap Warranty Warning

Warning that omitting the rear mounting strap can void the product warranty.

Power and Speaker Connections

Main Power and Memory Wiring

Connecting the red (main power) and yellow (memory backup) wires.

Antenna and Ground Wire Connections

Connecting the blue (antenna) and black (ground) wires.

Speaker and Auxiliary Input Wiring

Connecting speaker wires, AUX inputs, and low-level outputs.

Semi Automatic Antenna Warning

Crucial warning against connecting semi-automatic antennas to prevent radio damage.

Wiring Diagram and Controls

Radio Controls Overview

An overview of the radio's physical controls and their functions.

Radio Operation Basics

Power On;Off and Volume Adjustment

Instructions for turning the unit on/off and adjusting the volume level.

Source Selection and Traffic Announcement

Selecting listening sources and activating the Traffic Announcement (TA) function.

Clock Display and Bluetooth Call Management

Displaying the clock, viewing song info, and handling incoming/outgoing calls.

Preset Recall and Media Playback

Recalling radio presets and controlling playback for USB/CDC/Bluetooth audio.

Advanced Operation and Audio Tuning

Preset Management and Media Navigation

Recalling/storing presets and navigating USB/CDC folders/discs.

Track Selection and Audio Adjustments

Skipping tracks and adjusting audio properties like EQ, Bass, Mid, Treble, Balance, Fader.

System Menu and Display Settings

System Menu Navigation

Instructions for accessing and navigating the system menu for various settings.

Presets, Playback Modes, and Band Search

Storing presets, repeat play, selecting radio bands, and searching tracks.

Station Scan, AUX Input, and LCD Display

Scanning stations, using AUX inputs, and adjusting LCD brightness/color.

Detailed Sound Property Adjustments

EQ and Tone Control Settings

Adjusting equalizer settings and bass, mid, treble frequencies.

Balance and Fader Controls

Adjusting stereo balance between left/right and front/rear speakers.

Advanced Audio and Subwoofer Configuration

Loudness and Subwoofer Output Control

Using the loudness function and turning the subwoofer output on/off.

Subwoofer Volume and Crossover Settings

Adjusting subwoofer volume and crossover point frequencies.

Detailed Tone and Crossover Adjustments

Making detailed bass, mid, treble, and crossover frequency adjustments.

Sub-Menu System Access and Options

Accessing the Sub-Menu System

Step-by-step guide to accessing and navigating the sub-menu system.

Dimmer and LCD Color Settings

Adjusting LCD brightness and selecting display color presets.

Display, Tuning, and Audio Output Options

Display Function and Screen Saver

Configuring screen display to show functions or clock, and setting screen saver.

Tuning Modes and Audio Output Settings

Selecting auto/manual tuning, LOCAL/DX, and stereo/mono audio output.

Radio Configuration and Bluetooth Features

Station Presets and Area Settings

Automatically filling presets and adjusting broadcast area settings.

Bluetooth Pairing and Connection Management

Pairing, connecting, and disconnecting Bluetooth devices.

Beep, Clock Sync, and Volume Preferences

Configuring beep confirmation, clock synchronization, and volume settings.

Advanced Features and USB Player

Region-Specific Tuning Features

PTY, TA SEEK, PI Sound, and Mask DPI options (Europe only).

RDS Information and USB Player Operation

Utilizing RDS for station info and playing media from a USB drive.

Bluetooth and CD Changer Operation

Bluetooth Device Pairing and Call Handling

Steps for pairing Bluetooth devices and managing calls.

CD Changer and Media Source Selection

Operating the CD changer and switching between media sources.

Noise Suppression and Troubleshooting

General Noise Suppression Guidance

Information on electrical noise and maintaining sound quality.

Identifying Electrical Noise Sources

Common sources of electrical noise in vehicle audio systems.

Alternator and Antenna Noise Solutions

Troubleshooting and eliminating alternator and antenna noise issues.

Further Noise Troubleshooting and Specifications

Ignition and Accessory Noise Solutions

Troubleshooting and eliminating ignition and accessory noise.

Technical Radio Specifications

Detailed technical specifications for FM, AM, and Audio sections.

Troubleshooting Guide and System Reset

Troubleshooting Common Radio Problems

A guide to common problems, their causes, and solutions.

System Reset Procedure

Instructions for resetting the radio to its factory default settings.

Limited Warranty Information

Product Warranty Terms and Conditions

Details of the product's limited warranty period, coverage, and exclusions.

FCC Compliance Information

FCC Requirement Statement

Statement regarding FCC compliance, interference, and user responsibilities.