Boss Audio Systems 638UA User manual

10R - 021004

MP3-Compatible In-Dash AM/FM Receiver
with Front Panel USB and SD Memory Card Ports
and Front Panel AUX Input
ENCODER
VOLUME
KNOB
CD
PAUSE
BUTTON
CD
SCAN
BUTTON
CD
SHUFFLE
BUTTON
CD
REPEAT
BUTTON
FUNCTION
SELECT
BUTTON
DISPLAY/
ID3 TAG
INFORMATION
BUTTON
TUNING / SEEK /
TRACK / MP3 FILES SEARCH
UP/DOWN BUTTON
DIRECTORY
UP/ DOWN
PANEL
RELEASE
BUTTON
CD
SLOT
MUTE
BUTTON
EJECT
BUTTON
DSP
BUTTON
SCAN
BUTTON
POWER
BUTTON
AMS/
MP3
MENU
BUTTON
BAND/
LOUDNESS/
MP3
ENTER
BUTTON
PRESET MEMORY BUTTONS
(M1-M6)
LOCAL
BUTTON
MONO
BUTTON
MODE
BUTTON

E - 1
HANDLING COMPACT DISCS
MOISTURE CONDENSATION
NOTES ON CDs
P. 3
P. 4
P. 6
P. 7
1.
2.
3.
4.
5.
NOTES ON DISCS
There are paste residue.
Ink is sticky (P.5).
Stickers that are beginning
to peel away, leaving a
sticky residue (P.6).
Labels are attached (P.7).
On a rainy day or in a very damp area, moisture may condense on the lenses inside the unit.
Should this occur, the unit will not operate properly. In such a case, remove the disc and wait
for about an hour until the moisture has evaporated.
A dirty or defective disc may cause sound
dropouts while playing. To enjoy optimum
sound, handle the disc as follows.
Handle the disc by its edge. To keep the
disc clean, do not touch the surface (P.1).
If you use the discs explained below, the
sticky residue can cause the CD to stop
spinning and may cause malfunction or
ruin your discs.
Do not use second-hand or rental CDs that
have a sticky residue on the surface (for
example, from peeled-off stickers or from
ink, or glue leaking from under the
stickers).
Do not stick paper or tape on the disc (P.2).
Before playing, clean the discs with an
optional cleaning cloth. Wipe each disc from
the centre out (P.4).
Do not use solvents such as benzine,
thinner,commercially available cleaners, or
antistatic spray intended for analog discs.
Do not expose the discs to direct sunlight or
heat sources such as hot air-ducts, or leave
them in a car parked in direct sunlight where
there can be a considerable rise in
temperature inside the car (P.3).
Do not use rental CDs with old labels that
are beginning to peel off.
Do not use your CDs with labels or
stickers attached.
*******
*******
*******
*******
*******
Do Not Use Special Shape CDs
Be sure to use round shape CDs only for
this unit and do not use any special shape
CDs. Use of special shape CDs may
cause the unit to malfunction.(P.8).
Be sure to use CDs with disc mark
CD-Rs and CD-RWs which have not
undergone finalization processing cannot
be played. (For more information on
finalization processing, refer to the manual
for your CD-R/CD-RW writing software or
CD-R/CD-RW recorder.) Additionally,
depending on the recording status, it may
prove impossible to play certain CDs
record on CD-R or CD-RW.
P. 8
**************
*******
*******
*******
P. 5
****
*******
******* *******
*******
P. 2
P. 1

E - 2
INSTALLATION
Before finally installing the unit, connect the wiring temporarily and make sure it is all
connected up properly and the unit and system work properly.
Use only the parts included with the unit to ensure proper installation. The use of
unauthorized parts can cause malfunctions.
Consult with your nearest dealer if installation requires the drilling of holes or other
modifications of the vehicle.
Install the unit where it does not get in the driver's way and cannot injure the passenger if
there is a sudden stop, like an emergency stop.I
If installation angle exceeds 30° from horizontal, the unit might not give its optimum
performance.
Avoid installing the unit where it would be subject to high temperature, such as from direct
sunlight, or from hot air, from heater, or where it would be subject to dust dirt or excessive
vibration.
Be sure to remove the front panel before installing the unit.
DIN FRONT/REAR-MOUNT
This unit can be property installed either from “Front” (conventional DIN Front-mount) or
“Rear”(DIN Rear-mount installation, utilizing threaded screw holes at the sides of the unit
chassis). For details, refer to the following illustrated installation methods A and B.
DIN FRONT-MOUNT (Method A)
Installation the unit
1. Dashboard
2. Holder
After inserting the half sleeve into the dashboard,
select the appropriate tab according to the
thickness of the dashboard material and bend
them inwards to secure the holder in place.
3. Screw
1. Dashboard
2. Nut (5mm)
3. Spring washer
4. Screw (5x15mm)
5. Screw
6. Support Strap
Be sure to use the support strap to secure the
back of the unit in place. The strap can be bent by
hand to the desired angle.
7. Plain washer
Removing the unit
a. Frame
b. Insert fingers into the groove in the front of frame
and pull out to remove the frame. (When re-
attaching the frame, point the side with a groove
down wards and attach it.)
c. Insert the levers supplied with the unit into the
grooves at both sides of the unit as shown in
figure until they click. Pulling the levers makes it
possible to remove the unit from the dashboard.
a
b
c
Trim Plate Installation:
Push the trim plate against the chassis until it is fitted.
You must do this before you install the front panel, otherwise it can't be attached.
RCA LINE OUT JACK(OPTION)
30°
1
7
4
23
5
6
182
53
12
3

E - 3
DIN REAR-MOUNT (METHOD B)
Installation using the screw holes on the sides of the unit.
Fastening the unit to the factory radio mounting bracket.
1. Select a position where the screw holes of
the bracket and the screw holes of the main
unit become aligned (are fitted) and tighten
the screws at 2 places on each side.
2. Screw(must not use more than 6mm length)
3. Factory radio mounting bracket.
4. Dashboard or Console
5. Hook (Remove this part)
Note: the mounting box, outer trim ring,
and half-sleeve are not used for method B
installation.
DETACHABLE CONTROL PANEL (D.C.P.)
Removing The Detachable Control Panel (D.C.P.).
PANEL RELEASE
BUTTON
B
A
2
Attaching the DCP
CAUTION
DO NOT insert the D.C.P from the left side. Doing so may damage it.
The D.C.P can easily be damaged by shocks. After removing it, place it in a protective case
and be careful not to drop it or subject it to strong shocks.
When the release button is pressed and the D.C.P is unlocked, the car's vibrations may
cause it to fall. To prevent damage to the D.C.P, always store it in a protective case after
detaching it.
The rear connector that connects the main unit and the D.C.P is an extremely important
part. Be careful not to damage it by pressing on it with fingernails, pens, screwdrivers, etc.
These 2 screws are used to prevent damage to the CD
mechanism during transportation Please make sure to
remove the 2 screws before installing the unit into the vehicle.
DO NOT insert a CD into the unit before removing the 2
screws.
IMPORTANT
5
2
4
3
2
5
Note:
If the D.C.P is dirty, wipe off the dirt with soft,
dry cloth only. And use a cotton swab soaked
in isopropyl alcohol to clean the socket on the
back of the D.C.P.
1. Turn the power off
2. Press the D.C.P. release button
3. Remove the D.C.P.
1. Attach the panel at the right side first, with
point B on the main unit touching point A on
the D.C.P. (As shown on the digram).
2. Then press the left side of D.C.P. onto the
main unit until a “click” sound is heard.
Socket

E - 4
ELECTRICAL CONNECTION
a. Make sure your car battery is a 12 volt (6 filler caps) negative ground system (if not, a
converter will be necessary).
b. Before starting wiring connections, disconnect the power supply by removing the fuse from
the fuse box.
c. Connect the power wire to one of the extra terminals of the fuse box.
contact.
d. Connect the black ground wire to a metal part of the car. It is important to make good
e. Make other wiring connections as shown.
f. If your car does not have ISO connector, you can procure it from any car accessory shop.
Press this button to remove the control panel.
Press this button to turn on or off the power.
BASIC OPERATIONS
PANEL RELEASE BUTTON
POWER BUTTON
Notes: INCORRECT WIRING OR OPERATION WILL AVOID THE WARRANTY OF THIS UNIT.
Fuse Replacement:
To replace the fuse, pull out the blown fuse
from the socket. Insert a new one with same
rating.
FUSE
(CAR UNIT BACK SIDE)
DISPLAY BUTTON
FRONT CABINET
RIGHT TRACK
GROUND
AUX IN
LEFT TRACK
Note: If press RESET button, the unit still cannot function normally, please use a cotton
swab soaked in isopropyl alcohol to clean the socket on the back of the control panel.
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:
RESET BUTTON
Initial installation of the unit when all wiring is completed.
All the function buttons do not operate.
Error symbol on the display.
A) Tuner mode (Radio)
B) CDP/MP3 (only if a CD or Mp3 disc is inserted)
C) USB (only if a USB drive is inserted)
D) SD/MMC (only if a SD or MMC card is inserted)
E) AUX mode (only if this unit is equipped with this feature)
Whenever a USB or SD/MMC is being inserted, unit will automatically switch to USB or
SD/MMC mode, does not matter the unit is currently in what mode.
When in USB or SD/MMC mode, if the USB or SD/MMC is being removed, unit will
automatically switch to previous mode.
MODE BUTTON
Press this button to select different mode, sequence as follow:
MODE PRIORITY
FRONT AUX INPUT
Connect the external signal to the front 3.5mm earphone jack on front panel, then press Mode
button to select Aux mode. Press Mode Button again to cancel Aux Mode and return to
previous mode.
Press this button briefly, the LCD will display the clock for about 2 seconds, then return to
previous display mode.
Clock Adjustment
Under clock display mode, press DISP button until the LCD flashes, press Tuning Up Button to
adjust hour and Tuning Down Button to adjust minute.

E - 5
AUDIO OPERATIONS
ENCODER VOLUME KNOB
Turn this knob to adjust desired volume level.
FUNCTION SELECT BUTTON
Press this button to select desired audio function.
While the selected function is displayed, turn Volume Knob to adjust the level within 5 seconds,
otherwise the unit will return to volume adjustment mode.
MUTE BUTTON
Press this button to mute the sound. Press it again to resume listening.
DSP BUTTON (DIGITAL SOUND PROCESSOR)
Press this button to toggle the following EQ setting:
At DSP OFF mode, EQ will be controlled by Bass/Treble setting.
BAND/LOUDNESS BUTTON
Press the Band/Loudness Button long to switch the loudness on or off. When Loudness is on,
display will show 'Loud On' for a few seconds.
ORDER OF FUNCTION:
VOLUME(VOL) -> BASS(BAS) -> TREBLE(TRE) ->BALANCE(BAL) ->FADER(FAD)
FLAT->CLASSICS->POP M->ROCK M->DSP OFF
TUNING / SEEK UP AND TUNING / SEEK DOWN BUTTONS
1.Press these buttons briefly will operate AUTO SEARCH tuning mode, the radio will tune up or
down to the next station and remain on the frequency.
2.Press these buttons more than 2 seconds, operate as MANUAL SEARCH buttons, under this
mode the tuning frequency will advance up or down rapidly when the button is pressed. If the
buttons are not pressed within 3 seconds, they will return to auto search mode.
BAND/LOUDNESS BUTTON
This a dual function button. Press this button short to change between BAND FM1, FM2, Fm3
AM(MW) bands. Press it long to turn on or off Loudness function.
RADIO OPERATIONS
RADIO SIGNAL STRENGTH METER
This is use to indicate the signal strength of current radio station broadcast. When you choose
RADIO mode, it will show on the display.
Best
reception
Worst
reception
This control can be used to change between Local and Distant (-DX) tuning mode. Local
mode improves reception in some areas where the signal is too strong.
Press this button, the radio will tune up to search stations, the available stations will blinking
and stay on the display for a few seconds.
LOCAL / DX BUTTON
SCAN BUTTON
Use this control to select stereo or monaural reception for FM radio stations. You can
sometimes improve reception of distant stations by selecting mono mode.
FM MONO / STEREO BUTTON (MONO)
DUAL FREQUENCY SWITCH
Unit is defaulted in U.S.A frequency, if EURO frequency is required, a sharp pen is needed to
switch the button on the left side of the chassis to EURO frequency.
US EU

E - 6
AUTO MEMORY STORE/PRESET SCAN BUTTON (AMS)
1.PRESET SCAN: Press AMS button briefly enter Preset Scan mode, it will scan all the preset
stations in the memories, you can hear that will stay on each station for about 5 seconds.
2.AUTO MEMORY STORE: Press AMS button long to enter Auto Store mode, this feature will
automatically scan the current band and enter up to 6 strongest stations into the 6 preset
memories. To stop Auto Store & Scan, press the AMS button again.
STATION PRESET BUTTONS (M1-M6)
1.Press these buttons briefly to recall the stored stations in the selected band.
2.Presetting stations manually, Press the BAND button to select the band for the station to be
preset. Use Tuning Up/Down to tune in the stations to be preset. Press the Preset button at
which you want to store the station for at least 2 second. The preset number will appear on
the display accompanied by a beep, this indicate that the station has been stored into
memory.
CD OPERATIONS
CD SLOT
Insert the disc into CD slot. The CD will begin to play.
CD PAUSE BUTTON
Press this button to pause CD play, press again to release pause.
CD SCAN BUTTON
Press this button, the first 10 seconds of each track will be played sequentially until this button is
pressed again, then normal play will resume at the current track.
CD REPEAT BUTTON
Press this button, the current track will be played repeatedly until this button is pressed again.
CD SHUFFLE BUTTON
Press this button to play all tracks on CD in random. Press again to deactivate it.
EJECT BUTTON
Press this button to eject the CD from the unit. The receiver will switches to radio mode
automatically.
TRACK UP AND TRACK DOWN BUTTON
Press the Track Up Button to skip to the next track or previous track. Press the Track Down
button during play will return to the beginning of the current track, press it one more time to
skip to previous skip. Press and hold Track Up/Down Button to fast forward or fast reverse. CD
player starts when you release the button.

E - 7
MMC/SD CARD & USB DEVICE OPERATIONS
START THE USB DEVICE MODE
1.The USB socket is accessible as indicated in picture
1.(P.1)
2.Plug in the USB drive / device completely as indicated
in picture 2(P.2) and display will show “USB PLAY” to
indicate that the USB drive / device is being plugged in
correctly & the download has begun.
3.Does not matter the unit is in what mode (TUNER, CD,
SD/MMC, etc), once a USB drive / device is being
plugged into the unit, unit will automatically switch to
USB mode.
4.All the USB files playback function is same as normal
CD or MP3 disc playback.
1.Always unplugged the USB gently from the unit,
excessive force used will cause permanent & serious
damage to the unit & the USB drive / device.
TO STOP USB PLAYBACK
1.The USB drive / device is unplugged, the unit automatically switch to radio mode.
Or user can use mode button to switch to other mode.
2.User can use the mode button to choose USB mode (only if USB drive / device is
inserted in the unit ) or any other modes, when they are in any mode.
CAUTION
COMPATIBILITY
Due to the fast changing technology world, this unit may
or may not be compatible to all the USB drive / device
available with all the future technology, especially those
USB drive / device which require to install a driver. Always
choose a compatible USB drive / device which is
compatible with this unit.
Warning: Excessive weight or size USB drive/device
may cause permanent & serious damage to the unit and
may cause access to the buttons on the front panel
impossible. User must use an extension cable (provide
by USB device manufacturer) to connect with USB
socket to prevent any damage cause.
USB SPECIFICATION
* SUPPORT MAX IG USB FLASH MEMORY
* SUPPORT MAX 255 SONGS
* USB 1.1 DEVICE SUPPORT
* USB 2.0 DEVICE SUPPORT
(TRANSFER SPEED SAME AS VER 1.1)
* FILE MANAGER: FAT12/FAT16/FAT32
* CURRENT SUPPLY: MAX 500mA
NOTE:
This unit is not compatible with portable Hard-Disc.
P. 3
USB SOCKET
P. 1
P. 2

E - 8
START THE SD/MMC MODE
1.Press panel release button to release the front panel.(P.4)
CAUTION
2.The SD/MMC card slot is located on top of the front panel as
indicated in (P.5).
3. Insert the SD/MMC card into the card slot in the correct direction
until a “CLICK” sound is heard.
4.Close the front panel.
5. The display will show “SD PLAY” to indicate that the SD or
MMC card is correctly inserted. Once the SD or MMC card is
inserted, the MP3 file will automatically loaded & playback will also
start.
6. Does not matter the unit is in what mode (Tuner,CD, USB, etc),
once a SD or MMC card is being inserted in the unit, unit will
automatically switch to SD / MMC mode.
7. All the SD / MMC files playback function is same as normal CD or
MP3 disc playback.
P. 4
2.Please make sure to insert the SD or MMC
card in the correct direction / orientation as
indicated in picture 6(P.6). Wrong insert will
cause permanent & serious damage to the
unit & the SD or MMC card.
TO STOP SD/MMC CARD PLAYBACK
1.Push on the end of the SD or MMC card to eject the sd or MMC card. Once the SD or MMC
card is taken out, the unit will automatically switch to previous mode.
2.User can use the mode button to choose SD / MMC mode (only if SD or MMC is inserted in
the unit ) or any other modes, when they are in any mode.
P. 5
SD/MMC SPECIFICATION
* SUPPORT MAX 1G SD/MMC CARD
* SUPPORT MAX 255 SONGS
Back side
Front side
P. 6