Custom Autosound USA 740 User manual

User's Manual
THE ORIGINATOR OF CLASSIC
VEHICLE OEM FIT RADIOS
SINCE 1977
USA 740
RADIO
HIGH POWER 300 WATTS
AM/FM with RDS & 25 Pre-sets
7 LCD Color Choices (selectable)
CD Controller
Auxiliary In
Subwoofer Line out w/ x-over
Front/ Rear Fader
Left/Right Balance
Bass / Mid / Treble Control
DSP EQ
Clock
USB Jack charge for mobile phones
USB MP3/WMA Player
Loudness Function
Last Volume Memory
RCA Pre-out 5v (2 Pair)
Auto Antenna lead
AM/FM WITH RDS TUNER, BLUE TOOTH and VA DISPLAY
READY TO INSTALL INYOUR ORIGINAL DASH
NOASSEMBLY REQUIRED!
BlueTooth
Aux1 and Aux2 (on front)
/FLAC/WAV

Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Radio Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Low Level Output Connection . . . . . . . . . . . . . . . . . . . .4
Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Controls and Display . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Receiver Basic Operation . . . . . . . . . . . . . . . . . . . . . .5-8
Volume / Function Adjust . . . . . . . . . . . . . . . . . . . . . .6
Mode / Source Select . . . . . . . . . . . . . . . . . . . . . . . .6
Band Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6/8
CD Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7/15
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
USB Flash Drive . . . . . . . . . . . . . . . . . . . . . . . . . .6/14
BlueTooth Instructions 6/15
Adjusting Sound Properties . . . . . . . . . . . . . . . . . . 9-13
DSP EQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9/10
Bass/Mid/Treble Tone Control . . . . . . . . . . . . . . . . . . .
Balance/Fader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LCD Color / Dimmer . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Tuner Area USA/EUR/RUS/JAP/AUS . . . . . . . . . . . . .13
RDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Noise Suppression . . . . . . . . . . . . . . . . . . . . . . . . .16-17
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
1
This
is
HC
g
. . . . . . . . . . . . . . . . . . . .
9/10
. . . . .
. .
. .

Introduction
Thank you for your purchase of a Custom Autosound radio.
This AM/FM receiver is specifically designed and manufactured for your classic vehicle.
It is a reflection of over 36 years of customer feedback regarding preferred features,
vehicle compatibility, cosmetics and quality components.
The quality of the components and various parts that are used in our radios were devel-
oped in a California audio research laboratory. The laboratory researched and assem-
bled the finest affordable CD controller radio tuner and amplifier sections.
Custom Autosound and its staff own over 16 classic special interest cars and trucks.
These vehicles are used for research and development, car shows meets and much
personal pleasure. We find that our custom radios only sound as good as the speakers
they are matched with and a quality installation.
We also manufacture a full line of rear, dual front and dual voice coil speaker assem-
blies to fit in the original speaker areas. Also available are replacement kick panels with
built in speakers and a custom 2.1 amplified system with satellite speakers that look
like AC vents. All of these speaker assemblies are made to be mounted without perma-
nent vehicle modifications. Check out our web site!
Your Custom Autosound authorized dealer has information regarding our speakers and
special speaker assemblies, as well as information regarding custom radios for vehicles
other than yours. We offer over 300 different ‘conversions’ for various makes, year
groups, all radios are ready to install, no assembly required.
Again, we thank you for your purchase! You have increased the value and "Driving
Pleasure" of your classic without compromising originality.
Regards, Carl Sprague
President
Custom Autosound Mfg.
It Is advised that you do NOT return defective units to your dealer. There is generally no
"exchange" e.g.(as is standard Electronics Industry Policy). Also, most dealers do not
have radio technicians, test benches, etc and a return to factory through a dealer can
extend turn-around times by weeks!
Please call Custom Autosound, requesting technical assistance if a problem occurs. We
will gladly trouble shoot/advise, step by step.
After calling if your unit is in need of repair/return, Please ship to us, UPS preferably.
We will repair or replace and return ASAP! Normal turn around time is 7 business days
plus shipping time.
Custom Autosound Mfg, Inc. 800-888-8637 (8:00AM-4:00PM PST)
1030 West Williamson Ave Fax [phone]
Fullerton, CA 92833 www.custom-autosound.com
2

Radio Installation
Thank you for your purchase of this Custom Autosound product!
Owner- Installer: Please review installation instructions and owners manual.
Keep in mind that your radio and/or speakers are custom equipment designed specifi-
cally for your year vehicle. It should be handled carefully and installed preferably by an
auto radio specialist. We suggest that you 'BENCH TEST" the unit before installation, as
we do, prior to shipment.This is to insure that the equipment functions properly before
the time is spent for installation. This way, if a careless installation occurs and the unit
gets "fried" or some other possible damage, the installer is responsible. Shipping dam-
age does occasionally occur. If you should suspect shipping damage, please contact
the delivery company at once.
Please read the owners manual thoroughly before using your radio.
It is recommended that you disconnect the negative lead from the battery before
installing any electronic equipment in your vehicle. Reconnect when wiring is complete.
First, you will need to remove the original knobs and shaft nuts from your original radio
if present. Unplug the main wire harness and speaker leads from the back of the origi-
nal radio. Disconnect antenna lead and remove mounting strap from the back of the
radio. The radio is now ready to be removed from the dash. Check the original radio for
signs of water or oil damage from leaks. If leaks are present, do not install the new
radio. Water, oil or any other liquid damage is not covered under the new radio warran-
ty.
REAR MOUNTING STRAP OMISSION VOIDS WARRANTY!
Attach the rear mounting strap to rear of radio. Install the radio from behind the dash.
Now attach the mounting strap to the dash or firewall using an existing bolt or screw.
Now attach shaft nuts to secure the radio in the dash (DO NOT OVER TORQUE THE
SHAFT NUTS - SLIGHTLY MORE THAN HAND TIGHT IS SUFFICIENT). Once the
radio is centered and secured, you can install the knobs.
Please refer to wiring instructions on page 4&5.
Plug in antenna lead On speaker hook up make sure the positive lead goes to the posi-
tive terminal and the negative lead to the negative terminal of the speakers. A minimum
of two speakers is required for this stereo radio. DO NOT CONNECT ANY TWO
SPEAKER LEADS TO EACH OTHER OR TO VEHICLE GROUND. Radio damage will
occur. If less than four speakers are used, tape off remaining speaker leads to prevent
a short.
Connect the red power wire to a switched 12volt source. Connect the yellow memory
wire to a constant 12volt source. Wire the black ground wire to a clean, solid chassis
point or original ground wire from the factory radio.
Good Listening! Audio quality is only as good as speaker quality!
3

Power and Speaker Connections (Refer to Wiring Diagram on page 5.)
Note: Both Red and Yellow wires must be connected for radio to operate.
A-Main Power-Red Wire B+
Connect the RED wire (B+) to an accessory fuse that is switched OFF when the key
switch is in the OFF position and is switched ON when the key switch is switched to
the ON or accessory position.
B-Memory Back-Up-Yellow Wire B+
Connect the YELLOW wire (memory B+) to an accessory fuse that is always ON
regardless of the position of the key switch.The lead supplies power to the program
memory and the clock circuit when the radio is switched off. If there is no power on this
lead the radio will not turn on.
C-Power Antenna (Auto-Antenna) - Blue Wire
This wire can be connected to the positive switch terminal of the relay for the auto
antenna (if your car is equipped) or to the remote on switch of the amplifier or booster
(if equipped). NOTE: DO NOT connect this wire to a negative position or to any device
that requires high current Otherwise the radio may fail or become "fried". If your car is
not equipped with an auto antenna,leave this wire sealed and do not allow it to short to
any other positions.
Important Notice For Semi Auto Antenna
Do Not Connect the power antenna lead to this radio unless it is a fully automatic antenna. If your
antenna was controlled by a switch or knob on the original radio (ex. 1958-68 Cadillac radios) it is
not a fully automatic it is a semi automatic antenna. If you connect the antenna actuator lead of a
semi automatic antenna to this radio you will burn the circuit board in the radio. This can cause
unrepairable damage.
D - Ground Wire - Black
Connect the black ground wire to any clean paint and contaminant free area of vehicle
chassis. NOTE: Proper grounding is essential for optimum performance of your radio.
E - Speaker Wires
Connect the speaker wires as shown in Figure 2.
AUX1 and AUX2 Input
There is a right and left AUX1 input on the back of
your radio. Use these to listen to any portable device with standard headphone outputs
(MP3 player,
Nav unit, portable CD etc.) The radio will control the volume level only of
this input.
Low Level Output (Line Out Jacks) Connection
The radio is equipped with low level, high impedance outputs. The low level outputs
(RCA type Line Out Jacks) for front / rear / subwoofer will not drive speakers. If
you are connecting an amplifier or plan on it in the future, it is recommended to use
these leads. It makes for a cleaner and easier Installation.
4
Subwoofer Out
On Pig Tail
See Figure 2
Figure 1
or AUX2 input on the front
CDC or Blukit
Input
Line-Out Rear
Right
Left
Line-Out Front
Right
Left
Auxiliary Input Left
Right
noise peice

5
Connection for Optional
Custom Autosound
6CD Changer, CD1 Player
Figure 2
CONTROLS
Figure 3
9 8
34567
101 2 11
WIRING DIAGRAM
CDC
USB
MIC IN
SUBWOOFER
FUSE
A
B1 3 5 7
2 4 6 8
1 3 5 7
2 4 6 8
ANTENNA JACK
AUX IN
LNE OUT
REAR FRONT
L
R
IGNION/ACC +12V (A7)RED
(A8)BLACK
(A4)YELLOW
GROUND
CONSTANT +12
LEFT
FRONT
LEFT
REAR
AUTO
ANTENNA
(A8)BLUE
REMOTE/AMP TURN -ON LEAD
(A3)BLUE/WHITE WIRE
(B5)
+ WHITE
(B6)
- WHITE/BLACK
(B7)
+ GREEN
(B8)
- GREEN/BLACK
RIGHT
FRONT
RIGHT
REAR
(B3)
GRAY +
GRAY/BLACK -
(B4)
(B1)
PURPLE +
(B1)
PURPLE /BLACK -

7
Function See FIG.3 Radio Mode USB/CDC/BT AUDIO
Pre-set 2
Recall/
Store 4
Press to select the #2 radio
preset.
Press and hold to store pre-
set 2 into memory.
Press to play 10 seconds of
each track on the flash drive
or CDC
Press again to cancel the pre-
view scan function.
Preview Scan
Pre-set 3
Recall/ Store 5
Press to select the #3 radio
preset.
Press and hold to store pre-
set 3 into memory.
Press to randomly play all digi-
tal tracks on your flash drive or
CDC.
Random
Pre-set 4
Recall/ Store
6
Press to select the #4 radio
preset.
Press and hold to store pre-
set 4 into memory.
Press to move UP through
folders on your flash drive. The
first file in the selected folder
will play. The screen will dis-
play FOLDER NAME, etc.
ON CDC: DISC UP
Select Folder
Select Disc
Pre-set 5
Recall/Store
7
Press to select the #5 radio
preset.
Press and hold to store pre-
set 5 into memory.
Press to move DOWN through
folders on your flash drive. The
first file in the selected folder
will play. The screen will dis-
play FOLDER NAME, etc.
ON CDC: DISC DOWN
Select Folder
Select Disc
Next/Previous 8
Turn the right front knob to
tune to the next or previous
AM/FM frequency.
Turn the right front knob to
change to the next/previous
track this function aslo applies
Audio Adjust
8
Press the right front knob to activate the SEL(Select)func-
tion. Press repeatedly to cycle through the DSP(Digital
Signal Processing)EQ. Bass, Mid, Treble, Balance, Fader,
Loudness. Subwoofer and subwoofer specific adjustments
(when SUB ON is selected). Turn the left front knob to
select a value.
to BLUETOOTH music.
DISP FUN/CLK
The unit default setting displays
function info on the screen.
Select “DISP CLK” to show the clock
as the priority screen view without any
operation in 10 second.Turn right front
knob either clockwise or
counter-clockwise to select “DISP
CLK” or “DISP FUN”
SCR OFF/CLK
The unit default setting displays
nothing on the screen when the
radio power off.Select“SCR CLK”
to show the clock as the priority
Screen view when the radio power
off. Turn right front knob either
clockwise or counter-clockwise to
select “CR OFF” or “SCR CLK”.
LOCAL/DX
When listening to the FM turner,
you can access the LOCAL or DX
(default)option. Selecting between the
LOCAL and DX settings can aid in
listening to weak FM radio stations or
compensate for stations that have
too strong of a signal.
STEREO/MONO
When listening to the FM turner,
you can access the STEREO
(default)or MONO option.Selecting
between the stereo and mono
settings can set up a stereo
or mono output.
A
This
seek
tur
when
def
left
wise

8
System Menu
8
Preset 6
Store
9
Turn the right rear knob
counter-clockwise to select
the #6 radio preset.
Turn and hold the right rear
knob clockwise to store pre-
set 6 into memory.
Turn and release the right rear
knob counter-clockwise to
repeat the current track (RPT
TRK) or repeat all tracks (RPT
ALL).
Repeat Play
9
Turn and hold the right rear knob clockwise to turn On/Off
The AF function.(FM Only,Disabled in USA)
Band
9
Turn the right rear knob
clockwise to toggle through 5
radio bands (2 AM and 3
FM). NOTE:
When tuning to a station, a
stereo indicator (two ovals)
will show in the upper right
side of the radio’s LCD
screen. If there is no stereo
icon seen, the station is in
mono.
Turn the right rear knob clock-
wise once to select “FOLDER”
search mode, turn the front left
knob clockwise or counter-
clockwise to select folders
(directories) on the usb drive.
Press and release the front
right knob to select the folder,
the first song in that directory
will be heard.
Track/Directory
Search
Preset
Scan
9
LCD /
DISPLAY
11
SEE FIG.3
Function See FIG.3 Radio Mode USB/CDC/BT AUDIO
Press and hold the right front knob for 3 seconds to access
the sub-menu system where you can adjust: DIMMER,LCD
Color,DISPFUN/CLK,SCR OFF/CLK,Auto/Manual
turning,DX/LOCAL,STEREO/MONO,A STORE,AREA
USA/EUR/AUS/JAP/RUS,BT ON/OFF,BT DISC,BEEP
OFF/ON,CT ON/OFF,PTY Search,Vol Adjust/Vol Last and
volume default level, TA Seek/Alarm, PI Sound/MUTE,
Mask DPI/ALL. Toggle the selection by turning the left front
knob and pressing the right front knob to go the next mode.
Turn the right rear knob counter-clockwise to scan stations
stored in the current band the unti will pause for the
seconds at each preset station Turn the right rear knob
counter clockwise again to sotp scanning when the desired
station is reached.
AUX IN
10
AUX2 Inpat on the front nosepiece.
LCD DISPLAY

Adjusting the sound properties:
1. Press the right front knob, then release, to access the sound properties menu.
2. Repeatedly press and release the front right knob to scroll through the
available menu options.
3. Turn the left front knob right or left to select a value for the chosen menu
option.
4. Press and release the right front knob repeatedly to move to the next function
desired, or do nothing and the menu will revert to the current source display.
EQ SETTING
When you first access this menu, EQ is set to OFF, Turn the left front knob to view and
select from the 5 preset equalizer options.
FLAT setting offers sonic adjustments that lend themselves to classical
music.
CLASSIC setting offers sonic adjustments that lend themselves to classi
cal music.
POP setting accentuates the bass and treble settings. This is suitable for
bass heavy popular music.
ROCK setting accentuates the treble settings. This is suitable for rock
music.
BASS / MID / TREBLE selections do not come up when the EQ is set to anything other
than OFF.
BASS
The bass adjustment function
allows you to boost or cut the low
frequencies from -12 to +12.
MID
The mid-range adjustment function
allows you to adjust the middle
frequencies -12 to +12.
TREBLE
The treble adjustment function
allows high you to boost or cut the
high frequencies from -12 to +12.
balance
The balance adjustment function
allows you to adjust or pan the
stereo sound from the left or right,
This position or the driver in relation
to the speakers. Adjustment range
is 0-20 between the left and right
speakers.
9
TURN PRESS
TURN PRESS
TURN PRESS
TURN PRESS
TURN PRESS

10
FADER
The fader control allows you to fade
the sound from the front pair of speak-
ers to the rear pair of speakers.
Adjustment range is 0-20 between
front and rear speakers.
Loudness
This function boosts bass and treble
according to the volume. You will know
this function is active when you see
“LOUD” on your display. This function
boost bass and treble for low listening
volume and should be turned off at
higher volumes.
SUB ON/OFF
Turn the subwoofer RCA output ON to
activate this feature.
SUB VOL
When SUB ON is selected and a sub-
woofer is attached to the sub out RCA,
use this function to increase or
decrease the volume level of the sub-
woofer outputs from 0-12.
SUB (55h / 85h / 120h / 160h
When SUB ON is selected and a sub-
woofer is attached to the sub out RCA,
use this function to adjust the sub-
woofer crossover point to 55HZ, 85HZ,
120HZ or 160HZ. Use the left knob for
adjustment.
BASS / MID / TREBLE X-Over This Menu does not come up when the EQ is set to
anything other than OFF.
BASS
Use this function to make a more
detailed boost or cut adjustment of
bass (low) frequencies as fol-
lows:60/80/100/120Hz.This is a very
useful mode for making very specific tonal adjustments. When selecting one of these
60/80/100/120Hz points, any changes to the prior BAS Menu settings on page 10 (-12 to
+12) will boost or cut at the selected frequency setting chosen in this menu.
TURN PRESS
TURN PRESS
TURN PRESS
TURN PRESS
TURN PRESS
TURN PRESS

11
MID RANGE
Use this function to make a more
detailed boost or cut adjustment of
midrange (vocal) frequencies as fol-
lows:0.5K/1.0K/1.25K/1.5KHz.Default
setting is 1.0KHz.This is a very useful
mode for making very specific tonal adjustments. When selecting one of these
0.5K/1.0K/1.25K/1.5KHz points, array changes to the prior MID menu settings on page 10
(-12 to +12) will boost or cut at the selected frequency setting chosen in this menu.
TREBLE
Use this function to make a detailed
boost or cut adjustment of treble fre-
quencies as follows; 7.5K
/10.0K/12.5K/15.0K. Default setting is
10.0KHz.When selecting one of these
7.5K /10.0K/12.5K/15.0K points, any
changes to the prior TRE menu settings on page 10 (-12 to +12) will boost or cut at the
selected frequency setting chosen in this menu. This is a very useful mode for making very
specific tonal adjustments.
Accessing the sub-menu system menu:
1. Press and hold the right front knob for 2 seconds, then release, to access
the sub-menu system.
2. Repeatedly press and release the front right knob to scroll through the avail
able menu options.
3. Turn the left front knob right or left to select a value for the chosen menu
option.
4. Press and release the right front knob repeatedly to move to the next function
desired, or do nothing and the menu will revert to the current source
display.
Sub-Menu Options
DIMMER
Use this menu option to switch the LCD
brightness between 0 to 7 ,Turn the left
front knob clockwise or counter-clockwise
to make your selection.
(LCD DISPLAY COLOR)
Select the desired color preset. By
default, the LCD lighting will White.
Available color options include WHITE,
RED , GREEN, BLUE, CYAN, YELLOW,
PINK. When you selected the User Mode,
the LCD lighting will alternate between all
colors within 10 seconds.
TURN PRESS
TURN PRESS
TURN PRESS
TURN PRESS

12
DISP FUN/CLK
The unit default setting displays
function info on the screen.
Select “DISP CLK” to show the clock
as the priority screen view without any
operation in 10 second.Turn right front
knob either clockwise or
counter-clockwise to select “DISP
CLK” or “DISP FUN”
SCR OFF/CLK
The unit default setting displays
nothing on the screen when the
radio power off.Select“SCR CLK”
to show the clock as the priority
Screen view when the radio power
off. Turn right front knob either
clockwise or counter-clockwise to
select “CR OFF” or “SCR CLK”.
LOCAL/DX
When listening to the FM turner,
you can access the LOCAL or DX
(default)option. Selecting between the
LOCAL and DX settings can aid in
listening to weak FM radio stations or
compensate for stations that have
too strong of a signal.
STEREO/MONO
When listening to the FM turner,
you can access the STEREO
(default)or MONO option.Selecting
between the stereo and mono
settings can set up a stereo
or mono output.
TURN PRESS
TURN PRESS
TURN PRESS
AUTO SEEK
This function allows you to select auto
seek tuning or manual tuning when you
turn the right front knob to the right or left
when listening to the radio. The factory
default setting is AUTO SEEK. Turn the
left front knob clockwise or counter-clock-
wise to select manual or auto.
TURN PRESS
TURN PRESS

left
left

14
USB Player
The USB decoder is compatible with MP3 (MPEG Audio Layer-3) and WMA
(Windows Media Audio) files. It is preferable to set up your flash drive/thumb drive with
a folder system. This way you can advance to another set of songs (folder) by pressing
the disc up or disc down buttons. Similar to having multiple disc in a CD changer.
1. Insert your flash drive/thumb drive into the USB jack (located on 18” extension from
the back of radio).
2. Turn and release the left rear knob clockwise until USB PLAY is displayed on the
screen. The radio will automatically start playing your files starting with the first file on
the flash drive.
3.
Note: The folder name or number does not appear on the LCD Display. Track numbers
for songs in the folder are determined by the
order in which they were recorded to the
flash drive.
The player will not play MP4 or files with
copy protection.
FLAC,WAV
PROGRAM TYPE (PTY) (Works in EURO Mode only)
This function will allows you to Searching a special PTY Station in FM Mode. Turn the
left front knob clockwise or counter-clockwise to select the PTY which you want, And
then, Turn the right front knob clockwise to activate the Search process.
TA SEEK (Works in EURO Mode only)
This function allows you to select the tuner working in TA Seek or TA Alarm mode. Turn
the left front knob clockwise or counter-clockwise to select TA Seek or TA Alarm.
PI Sound (Works in EURO Mode only)
This function allows you to select the tuner working in PI Sound or PI Mute mode. Turn
the left front knob clockwise or counter-clockwise to select PI Sound or PI Mute.
MASK DPI (Works in EURO Mode only)
This function allows you to select the tuner working in Mask DPI or Mask All mode. Turn
the left front knob clockwise or counter-clockwise to select Mask DPI or Mask All.
RDS tuners can automatically tune in stations according to the style of music (or talk)
they broadcast. Some RDS tuners can even break in with traffic alerts or emergency
broadcasts.
RDS enables your receiver to display text messages (usually call letters and format info
that many FM stations include on a subcarrier signal within their normal broadcast sig-
nal.
The RDS function is always active, and if the FM station you are listening to is broad-
casting RDS information, the radio station call letters, song info, artist info and other
messages will appear.
To change songs, turn clockwise/counter-clockwise button (8). Use the disc up disc
down buttons (6)(7) to change folders if your drive is set up with folders.

CD Changer Operation
This radio is only compatible with the Custom Autosound USA-CD60 6 disc changer or the 1disc
CD1 player.
The CD magazine for the CD60 changer requires the CD’s be loaded with the label facing down. If
you get an error message or the changer can not find the CD please check the loading position of
the CD in the magazine. CD1 loads with label facing up.
1. With CD magazine in changer, Rotate and Release the Left Rear Knob (2)
Clockwise Until CDC is displayed on the LCD.
2. To select a disc press CD up (6) or CD down (7) until the desired disc number is
shown on the LCD display (11).
5. To skip to the next track, turn knob (8) clockwise .To go to the previous track, turn . . .
knob (8) counter clockwise.
6. To change the mode to another source, Rotate and Release the Left Rear Knob
Clockwise until the desired source is shown on the LCD displ y (11).
TURN
15
Pairing a Bluetooth Device
When connecting a Bluetooth device for the first time，you must first pair the device with
the USA 740.For most devices，pairing only needs to be done once. Please follow these
steps: Make sure the BT (Bluetooth) function is turned "ON" in the rad io Sub-Menu.
See "Sub-Menu System" on page 13.
•Ensure Bluetooth is enabled on the phone to be connected to the unit.
•Search for a new Bluetooth device from the phone (this may take up to 30 seconds).
•Select "CUSTOM AUTOSOND" from the Bluetooth device list.
•Some devices may require you to enter a PIN. If prompted ，enter "0000"for the PIN.
"PAIRING OK" will be displayed on the LCD display if pairing is successful.
The paired device will then connect to the USA 740 automatically.
Making a Call
1. Dial the desired number on the paired mobile phone.
2. Once dialing is in progress, “CALLING” will be displayed on the LCD.
3. When the call is in progress, “TALK” will be displayed on the LCD, along
with the elapsed call time (TALK 00:00).
Receiving a Call
1. If a call comes in, audio playback from the current source will either be
muted or paused (depending on the source) and “PHONE IN” will be shown
on the display, along with the Caller ID, if it is enabled by the phone/carrier.
2. Turn the left rear knob counter-clockwise to accept the call.
Ending a Call
To end the call, turn the left rear knob counter-clockwise to end the call.

16
Noise Suppression
All CAM electronics are designed for maximum electrical noise rejection. In some instal-
lations however, electrical noise may affect the quality of sound reproduction.
If electrical noise is present after installing your Slidebar radio, identify the source of the
noise using the descriptions under Sources Of Electrical Noise. To eliminate the noise
follow the procedures described under Elimination of the specific noise source.
1-Check all ground connections. Remove paint away from painted surfaces to secure a .
good electrical ground.
2-Check battery posts. If contacts are corroded or loose ,clean and tighten both
. terminals.
3-Check battery or add fluid if needed.
4-Check condition of spark plug and distributor leads. Worn or damaged leads will
. generate noise than can be very difficult to eliminate.
5-Check installation of factory noise suppressor(s). Verify that the connections are . . .
solid. Refer to the vehicles service manual for nose suppressor location or allow a . .
qualified mechanic to inspect the device (s) for you.
6-(Optional) Some professional installers will install a simple L.C. noise filter even if . .
. there is no noise present in the system. This is a simple and relatively inexpensive . .
device available at your nearest Autosound dealer or electronic supply store. Most . .
filters designed for car stereos carry a current rating of 3 amps or more. Follow the . .
manufacturers installation instructions. This filter is installed in the power lines of the .
car stereo.
Sources Of Electrical Noise
Alternator Noise
This noise is generally a high pitched whine present with engine running.The pitch of the
whine will vary as engine RPM varies. Alternator noise usually becomes more apparent
with an electrical load to the system. Switching the headlights on usually increases the
noise.
Elimination
1. Install an L.C.noise filter (available from your Autosound dealer or your nearby .
electronic or automotive supply store)in the power lines of your radio. This filter . .
should be rated at 3 amps minimum.
2. Start the car’ s engine.switch on the lights (to accentuate the noise) and switch . .
on the USA-740. If noise is still present, proceed to step 3.
3. Install an alternator noise filter (available from your Autosound dealer or your . . .
nearby electronic or automotive supply store). Follow manufacturer’s installation . .
instructions.
Antenna Noise
A static or crackle heard through the speakers, usually when the car is running ,but
sometimes present with the ignition off. If a crackling static if present, follow the steps
outlined below to confirm the antenna as the source of the noise.
1. Start the car engine.
2. Switch on the radio.
3. Adjust the volume so that noise is audible.
4. Reduce volume setting of the car stereo but do not switch it off. If noise decreas. .
es or disappears, the signal is most likely being picked up by the car antenna. If the
noise persists after following the steps listed below, proceed to ignition Noise.

17
Antenna Noise cont.
Elimination
1. Test or have tested the antenna lead for any breaks or shorts.Signs of crimping, .
. kinking, fraying or rust usually indicates damage to the cable.Replace the
antenna or cable if necessary.
Ignition Noise
A popping or crackling noise heard through the speakers. The noise will vary as the
engine rpm varies,The noise will Only be present with the engine running
Elimination
1. Install an L.C. Filter Network in the power lead of the radio. The filter should
be rated at minimum 3 amps.
2. Inspect spark plug and distributor cable for signs of wear or damage. Replace as
. necessary using resistor cable only. Metal conductor ignition cables increase
. static interference.
NOTE: Do not use spark plug or distributor noise filters as these can create more
problems than they can solve. They decrease the quality of the spark generated by
the spark plugs and they may create more static than they eliminate.
Accessory Noise
A popping heard when the lights, turn indicators, windshield wipers, cigarette lighter,
etc. are switched on indicate a vehicle wiring deficiency. Most occurrences are
minor and preset no risk to the stereo system other than the annoyance to the lis-
tener. However, severe cases may damage the speakers, minor occurrences can be
remedied. A professional must attend to severe occurrences, as they present a
threat to not only the stereo system but to the vehicle wiring itself.
Elimination
1. Install an L.C. Filter Network in the power leads of the USA 740 radio. The filter
should be rated at a minimum of 3 amps.
2. If the noise persists, consult a professional automotive service technician.
Radio Specifications
FM Section
Tuner Type . . . . . . . . . . . . . . . . . . . . . . . . .PLL
Frequency Range . . . . . . . . . .87.5-107.9 MHz
Usable Sensitivity . . . . . . . . . . . . . . . . .12.5dBf
Quieting Sensitivity . . . . . . . . . . . . . . . . . .4uV
T.H.D . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8%
AM Section
Frequency Range . . . . . . . . . . . .530-1710KHz
S/N Ratio . . . . . . . . . . . . . . . . . . . . . . . . .50dB
Selectivity . . . . . . . . . . . . . . . . . . . . . . . . . 25dB
Audio Section
Output Channel . . . . . . . . . . . . . . . . . . 45 X 4
Output Impedance . . . . . . . .4ohm per speaker
Response . . . . . . . . . . . . . . . . . . .30Hz-I8KHz
General
Power Supply . . . . . .12VDC Negative Ground
Speaker impedance . . . . . . . . . . . . . .2-8 ohm
Stand-By Current . . . . . . . . . . . . . . . . . .<2mA
Chassis ....3/4"
IF Frequency.......................10.7MHz
Sensitivity ...............................2.6V
S/N Ratio ...............................67dB
Capture Ratio........................1.5dB
Separation..............................35dB
IF Frequency......................450KHz
Sensitivity............................. 2OuV
System Power.........Max 300 Watts
THD ..........................................1%
Note: All specifications are subject
to change without notice.
200mm(7- )(w) X 50mm (2")H
X 150mm (5-
7/8")(D)
To charge mobile phones through
to USB interface max 1000mA.....

Problem Possible Cause Solution
Radio Will Not Turn On
NO Lights, NO Sound
Power Lead: Red Wire
(switched) not connected or
Power not getting to radio
Check all connections for
proper voltage. Voltage range
12-14.7 Volt
Power Lead:Yellow Wire (con-
stant) not Connected or 12 volt
not getting to radio
Check all connections for
proper voltage. Voltage range
12-14.7 Volt
Ground wire not connected Check for good ground con-
nection on Black wire.
Fuse on the back of the radio
blown
Replace blown fuse
Lights Displayed but No
Sound
Problem with a speaker or
speaker wire
Verify all speakers used are 4
to 8 ohm. Verify that none of
the speakers are going to
ground.
Verify that none of the speak-
er wires are shorting to them-
selves or ground.
Sound only heard on one
side
Speaker wires disconnected
Balance control set to one side
Check all connections
Adjust balance and fader
control to center position
Bad Speaker Reverse speaker leads at
radio. If still no sound on the
same speaker the speaker is
bad. If no sound on other
check wiring and fader control
on radio.
Lights Dim and Radio
Distorts at High Volume
Poor Ground Connection Reconnect Ground wire to a
solid chassis ground
Noise with Radio
Reception
Antenna not fully extended
Car underneath Fluorescent
lights
Extend antenna to full length.
Back vehicle out of garage
and test again
18
System Reset:
Remove all power from the radio for 2 minutes, reconnect power and all settings
will be at factory default.
This radio is for 12volt negative ground vehicles only. If your electrical system
is 6volts and or positive ground Custom Autosound has power inverters #PGPI-
HC (positive ground power inverter) and voltage boosters #NGVB-HC (negative
ground voltage booster) for use with this radio.

LIMITED WARRANTY
If your product does not work properly because of a defect in material or work-
manship, Custom Autosound Mfg.,Inc. (the Company) will for the length of the
period indicated on the chart below, which starts with the date of original pur-
chase (“Limited Warranty period”), at its option either (a) repair your product with
new or refurbished parts, or (b) replace it with a new or refurbished product. The
decision to repair or replace will be made by the company.
During the “Labor” Limited Warranty period there will be no charge for labor.
During the “Parts” Limited Warranty period, there will be no charge for parts. This
Limited Warranty is extended only to the original purchaser and only covers
product purchased as new. A purchase receipt or other proof of the original pur-
chase date is required for Limited Warranty service.
To obtain repairs or replacement within the terms of this warranty, the product
should be delivered, transportation prepaid, to the Company at the address
shown below.
This warranty does not extend to the elimination of car static or motor noise cor-
rection, antenna problems, costs incurred for removal or reinstallation of product,
or damage of tapes, speakers accessories or car electrical systems.
This warranty does not apply to any product or part thereof which has been
damaged through alteration, mishandling, misuse, neglect, or accident.
ANY IMPLIED WARRANTY IS LIMITED TO THE DURATION OF THIS WRIT-
TEN WARRANTY. UNDER NO CIRCUMSTANCES SHALL THE COMPANY BE
LIABLE FOR ANY LOSS OR DAMAGE, DIRECT OR CONSEQUENTIAL, ARIS-
ING OUT OF THE USE OR INABILITY TO USE THIS PRODUCT: No person or
representative is authorized to assume for the Company any liability other than
expressed herein in connection with the sale of this product.
Some states do not allow limitations on the length of an implied warranty or the
exclusion or limitation of incidental or consequential damage to the above limita-
tions or exclusion may not apply to you.
This warranty gives you specific legal rights and you may also have other rights
which vary from state to state.
1030 W. Williamson Ave. Fullerton CA. 92833
800-888-8637 714-773-1423 FAX [phone]
Product or Part Name PARTS LABOR
All In-dash car radios, radio/tape
player combinations. Two (2) Years One (1) Year