Boss Audio Systems 748UAI User manual

4
10 R - 03 1817

The following illustration shows a typical installation. If you have any questions or require information
regarding installation kits, consult your customer car audio dealer or a company suppling kits.
If you are not sure how to install this unit correctly, have it installed by a qualified technician.
Remove the unit
Trim Plate
4
182mm
53 mm
1
2
3
Screw
Dashboard
Sleeve
Bend the appropriate
tabs to hold the sleeve
firmly in place.
Trim
Plate
Control
Panel
To attach the front panel back to the unit chassis,
please insert the right side of the panel in the chassis
until it is correctly engaged. Press the left side of the
panel until the mechanism locks it into place.
1
1. Press the Panel Release button.
2. Push the left side of the panel rightward
3. Pull the panel towards you to disengage it from the chassis.
Release
E - 1
1. INSTALLATION

Wiring Diagram
REAR LINE OUT R-CH
REAR LINE OUT L-CH
AMP
ANTENNA
JACK
REAR
L
R
FUSE
FRONT LINE OUT
AUX-IN
YELLOW
BLACK
WHITE
WHITE
RED
RED
CONNECTOR
ISO
SUBWOOFER BLUE
FUSE
1
2
3
4
5
6
7
8
4
5 7
8
A
B
ISO CONNECTOR WIRING CHART
YELLOW
WIRE COLOR
VIOLET/BLACK
GREY/BLACK
WHITE/BLACK
VIOLET
WHITE
GREY
B1
B5
B4
B3
B2
GREEN
GREEN/BLACK
B7
B8
B6
A5
A4
PIN
BLACK
A8
REDA7
BLUE
LEFT FRONT SPEAKER (-)
LEFT REAR SPEAKER (+)
LEFT REAR SPEAKER (－)
RIGHT REAR SPEAKER (+)
RIGHT FRONT SPEAKER (+)
LEFT FRONT SPEAKER (+)
RIGHT FRONT SPEAKER (-)
RIGHT REAR SPEAKER (-)
FUNCTION/LABEL
CONNECT TO SYSTEM CONTROL
TERMINAL OF THE POWER AMP OR
AUTO ANTENNA RELAYCONTROL
TERMINAL(max 150mA 12VDC)
BATTERY(+)
IGNITION(ACC)
GROUND
Figure 2
2. CONNECTING THE SYSTEM
E - 2

3. THE MAJOR FUNCTION OF THIS UNIT
E - 3
No. Item Decriptions
LOC
BAND
Short press this button to change between BAND
FM1,FM2,FM3, AM1(MW1) or AM2 (MW2).
1
2
3
4
5
6
7
Press this button to open the control panel.
Press this button adjust the tuner sensitivity if
you want to receive more radio stations or only
stations with strong signal.
[LOCAL]: only stations with strong signal can
be recevied.
[DISTANCE]: Stations with strong and weak
signals can be recevied.
AUDIO
(Power)
Press this button or any other button on the front
panel (except Release/Eject) to turn the unit on.
Press this button again to turn the unit off.
MUTE
Press this button to turn the Mute On/Off.
(Release)
VOLUME KNOB
Rotate the encoder volume to increase and
decrease the volume.
(Audio Menu)
(Local/Distance)
BROWSE
Under Media playback mode, press this button to
confirm the selection.
ENTER
17
2
3
3
4
56
8
910 11
12 13
14 15 16
Press to access into the Audio Menu mode to
adjust the below options:
BASS(Bass Level) / TRE (Treble Level) / BAL
(Balance) / FAD (Fader) / EQ(Preset Equalizer)
/xBAS(iX-Bass)
Under Media playback mode, press to access into
the music folder / file searching mode.
Under iPhone / iPode mode, press this button to
access into the Playlist, Artist, etc searching mode.

Under Media playback mode, press and hold
momentarily to fast forward /backward.
Under Radio mode, press these buttons to
enter into the Auto Seek mode, press and hold
these buttons to enter into the Manual Seek mode.
Under Media playback mode, press these buttons
to skip a chapter / track / scene / file.
FILE UP
/DOWN
TUNE UP
/DOWN
FAST FORWARD
/BACKWARD
11
E - 4
8EQ
Press to select the preset equalizer setting：
EQ OFF -> POP -> USER -> TECHNO ->
ROCK -> CLASSIC -> JAZZ -> VOCAL
Press to quick return previous menu or mode.
ESC
9
Press SOURCE button to select a different mode of
playback mode: Radio, CD play,USB(USB iPod), SD
and Aux In．
SOURCE
10
Press this button to turn On or Off the iX-BASS
booster function.
Under Tuner mode, press this button briefly to
display the Clock time.
Press this button to eject the Disc.
Press to access into the System Menu mode.
Under iPod/iPhone mode, press to access into the
iPod/iPhone control mode.
Under Tuner mode, short press the Numeric
buttons to recall the preset stations. Hold press
the Numberic buttons to store the listening station.
Under Media playback mode,press the Numeric
buttons to perform the below operation：
Under Media playback mode, press this button
repeatedly to display ID3 information: Track number
and play time ->folder ->file ->title ->artist ->album
- > c l o c k . .
PRESET
NUMERIC
BUTTONS
Press and hold this button to turn On or Off the
Subwoofer function.
SUBW
XBS
INFO
EJECT
MENU
13
14
15
16
12
(Subwoofer)
Number
Button
561 2 3 4
Pause/Play INT RPT
RDM
Folder Down Folder UP

4. ADJUST SYSTEM MENU SETTING
AUTO STORE
Under the Tuner mode, press the ENTER button to access into the Auto Store mode. The six strongest
stations of the selected band are saved in preset channel automatically:FM1,FM2,FM3(1-6),AM1,AM2.
CLOCK SET
CLOCK FORMAT
Program the current time by rotating the Encoder Volume Knob clockwise to adjust the minutes and
hours.
User can rotate the Encoder Volume Knob to select the clock format 12H or 24H
BEEP ON/OFF (Beep Tone)
The beep tone feature allows the selection of an audible beep tone to be heard each time a button is
pressed on the face of the radio. "Beep On" is the default display. Rotate Encoder Volume Konb to select
the “Beep Off” option.
Press MENU to access into the System Menu. Press MENU repeatedly to select the item to be adjusted,
then roate Encoder Volume Knob to select a value / option.
This option allows the selection of the frequency spacing appropriate for your area. Rotate the Encoder
Volume Konb to select the USA, LATIN, EUROPE, RUSSIA, ASIA (Asia Pacific), MID-EAST(Middle East)
or JAPAN options.
AREA (Tuner Frequency Spacing)
E - 5

5. EXTERNAL CONNECTION AND MEDIA PLAYER
MP3 music files are audio compression format. This unit can play MP3 directly from files contained on a
USB Memory Stick, SD Card.
1. Open the cover marked USB icon on the front panel.
2. Insert the USB device into the USB socket. The unit
starts playing from the USB device automatically.
NOTE
Ensure that the USB device contains playable music.
Remove the USB Device
Insert the Memory Card
Insert the USB Device
Before remove the USB stick from the front panel. Always remember to switch off the unit's power then
remove out the USB Stick.
1. Press panel button to release the front panel.
2. Push the left side of the panel rightward. Pull the panel
towards you to disengage it from the chassis.
3. Insert the card into the card slot in the correct direction
until a “ CLICK” sound is heard,
4. Close the front panel, then the unit starts playing from
the card automatically.
Press the unit in off. Press the card until you hear a click
sound, the card is now disengaged. then remove the card.
Remove Memory Card
Ground
Left Track
Right Track
Connect the external signal to AUX in jack located atthe front of the
panel, then press Mode button to select Aux mode. Press Mode
Button again to cancel Aux Mode and return to previous mode.
You can reset the unit to its default setting.
The RESET button is located on the main unit (as shown on the diagram). To press it vertically with a
ballpoint pen or metal object will activate it.
The reset button is to be activated for the following
reasons:
1. Initial installation of the unit when all wiring is
completed.
2. All the function buttons do not operate.
3. Error symbol on the display.
USB DEVICE OPERATION
MEMORY CARD OPERATION
CONNECT THE AUX-IN
RESET THE UNIT
Face Up
E - 6

6. iPod / iPhone OPERATION
This unit is equipped with iPod/iPhone Ready function which allow end user to have direct control of the
iPod/iPhone on the front panel control button and display iPod/iPhone song information on the unit's
LCD display. Please read below for more details operation.
Compatible iPod/iPhone
Connect iPod / iPhone
Apple iPod and iPhone models with a 30-pin dock connector:
• iPod nano (2nd generation)
• iPod nano (3rd generation, 4GB only)
• iPod nano (3rd generation, 8GB only)
• iPod nano (4th generation)
• iPod nano (5th generation)
• iPod classic (1st generation)
• iPod classic (2nd generation)
• iPod touch (1st generation)
• iPod touch (2nd generation)
• iPod touch (3rd generation)
• iPod video (30GB, 80GB only)
• iPhone
• iPhone 3G
• iPhone 3GS
• iPhone 4
Insert the iPod/iPhone USB cable to the Front
Panel USB socket, the unit starts playing
Press MENU on front panel repeatedly the [IPOD CONTROL] is displayed, then press ENTER to switch
between the two control modes:
• iPod control mode: Use the iPod/iPhone to operates music control.
• Panel control mode: Use the Panel buttons on unit to operates the music control.
iPod/iPhone control music playback mode
Search for a track on iPod/iPhone
NOTE
Please make sure the iPod/iPhone cable is connected correctly. And please only use
original iPod / iPhone cable( iPhone, iPod & cable not supplied with this unit.).
1. Press BAND/ to browse iPod/iPhone menu.
2. Roate Encoder Volume knob to select the Artist search mode, and press ENTER to confirm.
3. Roate Encoder Volume knob to select the Artist, then press ENTER to confirm.
4. Roate Encoder Volume knob to select desired song in the current album, press ENTER to confirm.
iPod/iPhone USB cable
(not supplied with this unit)
Audiobook
In iPod/iPhone mode, you can set the audiobook playback speed on this car audio.
Press MENU on front panel repeatedly the [AUDIOBOOK] is displayed,then rotate Encoder Volume
Knob to select setting:
NORMAL / FASTER / SLOWER
E - 7

7. THE FUNCTIONS OF REMOTE CONTROL
No. Button Item Decriptions
1
2
MUTE Press this button to turn the mute On / Off.
POWER
ON/OFF
When the unit is power on, press this button to
turn Off the unit. Once the unit power off, press
this button to turn On the unit.
1
5
AUDIO AUDIO
MENU
Press this button to enter into the Audio
Menu mode.
SRC
SOURCE
Press this button to select different source
playback mode: TUNER,USB, SD and
AUX IN.
4
5
6
TUNE UP
/DOWN
FILE UP
/DOWN
FAST FORWARD
/BACKWARD
Under the tuner mode, press this button to
enter into the Auto seek mode, press and
hold this button to enter into the Manual Seek
mode.
Under USB/SD media playback mode, press
and hold momentarily to fast forward /
backward.
Under USB/SD media playback mode, press
these buttons to skip to the next or previous
file / song.
2
6
4
3
3
Press this button to increase / decrease the
volume.
VOLUME
KNOB
E - 8
MUTE

Before going through the check list, check wiring connection. If any of the problems persist after check
list has been made, consult your nearest service dealer.
No power or no sound
Noise in broadcasts
Cannot play disc
Car engine is not on. Turn the car engine on.
Signals are too weak. Select other stations with stronger signals.
Ensure tha the disc label is inserted with the printed side facing up.
Cable is not correctly connected. Check connections.
Check the connection of the car antenna.
Wipe the disc with fibre cleaning cloth from the centre to the edge in a straight line.
Fuse is burnt. Replace fuse.
Change broadcast from Stereo to mono.
This disc may be defective. Play another disc.
Ensure that the CD is a finalised CD/CD-R/CD-RW.
Ensure that the CD is not encoded with copyright protection techn-ologies.
Volume is in minimum. Adjust volume to a desired level.
If the above solutions cannot help, press the RESET button.
Ensure that the track played is of a compatible format.
The CD Skips tracks
Preset stations lost
Display show ERR-1
Display show ERR-3
Display show ERR-5
Ensure that the CD is not damaged or dirty.
Battery cable is not correctly connected. Connect the battery cable to the terminal that is always
live.
The disc, USB or SD device cannot be red in two minutes
USB/SD data error.
Communication error or component is damged.
Disc is upside down. Ensure the printed side is facing up.
Ensure that random mode is deactivated.
8. TROUBLE SHOOTING
E - 9