Boss Audio Systems 638BA User manual

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638BA
MP3-Compatible AM/FM CD Receiver
USER’S MANUAL CONTENTS
Installation
DIN front-mount installation
DIN rear-mount installation
Removing the head unit
Detaching the front panel
Replacing the front panel
General controls
Radio controls
Audio controls
CD/MP3 Playback controls
How to select MP3 files
Controls behind faceplate
USB and Front side AUX IN operations
Remote control functions
How to use bluetooth in your car audio
Wiring diagram
Troubleshooting
Specifications
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Release Button
press RELEASE to release
the front panel...
Before removing the bezel, press the
RELEASE button to remove the front panel.

5
Release Button
press RELEASE to release
the front panel...

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Front panel controls
AUX IN
POWER Press any button to turn unit ON. To turn
head unit off, press and hold POWER.
GENERAL CONTROLS
RELEASE Press to release and remove the front panel.
DISP Selects radio frequency or clock display.
To set the clock:
1. With clock display selected, hold down (DISP) button until
clock display starts flashing.
2. Rotating VOL left to change minutes, VOL right to change
hours.
3. Press (DISP) button to start clock
BEEP MODE When press the AUDIO button for more than 2
seconds, it is activated as selecting mode of these function.
BEEP ON: BEEP sound can hear from speaker when the but-
tons are pressed.
ESP SEL
SEL BEEP
SEL
2 sec. MULTI BEEP ON/OFF
VOL
The Liquid Crystal Display will display the current state of the unit.

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AUX IN
STATION PRESETS Six numbered preset button store and recall sta-
tions for each band.
Storing a station:
1. Select a band (if needed)
2. Select a station
3. Hold a preset button longer than one second. Preset station num-
ber appears in the display when station is saved.
Recall a station:
1. Select band (if needed)
2. Press a preset button for less than one second to select stored sta-
tion.
RADIO CONTROLS
TUNE BUTTONS When pressed for less than 1 second, these keys operate
as manual tuning mode.
When pressed longer than 1 sec., they are operated as SEEK tuning mode.
If the keys are not pressed for 3 seconds, they will return to SEEK mode
again.
AS/PS Select six strong stations and store them in current band.
1. Select a band (if needed)
2. Hold A/PS button for more than three seconds. The new stations
replace stations already stored in that band.
Preset Scan
Scan stations stored in current band
1. Select a band (if needed)
2. Touch A/PS for more than one second but less than three seconds.
Radio pauses for five seconds at each station. Touch A/PS again to stop
scanning when desired station is reached.
SCAN This key is operated as RADIO SCAN. The operation is similar as
normal search but different thing is holding 5 seconds on every station
detected in RADIO SCAN mode.
BAND Push this switch to select the desired band. Selection is made in
regular sequence as FM-AM.
SETTINGS MODE When press this button for more than 2 seconds, it is
activated as selecting mode of these function.
SEEK 1: When SEEK 1 mode is activated, AUTO SEEK SCAN is stopped when
station is detected even user still push SEEK button.
SEEK 2: Auto SEEK SCAN is not stopped even station is detected if user
push SEEK button. When release this SEEK button, then stop when station
is detected.
ESP SEL
SEL SEEK
SEL SEL
2 sec. MULTI BEEP SEEK1 / SEEK 2
VOL

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Front panel controls
AUX IN
AUDIO BUTTON and ROTARY CONTROL Press the button repeatedly to
access Volume, Bass, Treble, Balance and Fader functions. Then use the
knob to adjust the selected function.
AUDIO CONTROLS
EQ Press repeatedly to cycle through five modes: POP M, ROCK M,
CLASS, FLAT M or DSP OFF.
SUB Press and hold to engage subwoofer output.
LOUD Press this button to increase the level of bass output.
SOURCE By pressing this key, user can select AUX/TUNER/CD-
MP3/USB mode.
MUTE Press to silence the receiver. Press again to
return to normal operation.

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AUX IN
TUNE/TRACK BUTTONS Press and release
to advance to next track or to return to
the beginning of the current track (track
number will be displayed). Press and hold
to fast forward or reverse. Play will begin
at the point when you release the button.
CD/MP3 PLAYBACK CONTROLS
PAUSE Press to pause CD playback. Press
again to resume playback
EJECT Press to eject CD
SHUFFLE Press to play ALL tracks
on the CD in random order.
REPEAT Press and release to con-
tinuously repeat same track. Press
again to stop repeat cycle.
CD SCAN Press to hear first several
seconds of each track on current disc.
Press again to stop intro and listen to
intro last previewed.
CD/MP3 Operation
To PLAY a CD gently insert a CD with the label side up into the disc slot. It will automatically
load and begin playing the first track.
To EJECT a CD press EJECT to stop the CD playback and eject the CD from the slot. The receiver
will automaticvally switch to radio mode.
To PAUSE a CD press PAUSE to stop playback temporarily. Press again to resume playback.
To SKIP TRACKS press the or key to choose the next or preceding track.
To FAST FORWARD or REVERSE press and hold the or key to the desired location
on the disc. Releasing the button starts playback at the location.
To REPEAT a TRACK press REPEAT to continuously repeat the current track. Press again to
return to normal playback mode.
To PREVIEW ALL TRACKS press CD SCAN to play the first several seconds of each track. Press
it again to stop an play the current track being previewed.
To PLAY TRACKS IN RANDOM ORDER press SHUF to play ALL tracks on the CD in random
mode. Press again to cancel this function.
-10 10 TRACK DOWN SELECT:
(In case of MP3 files)
+10 10 TRACK UP SELECT:
(In case of MP3 files)
ESP MODE When press AUDIO button for
more than 2 seconds, it is activated as
12 sec. or 45 sec. of ESP mode can be
selected.
ESP 12s. / 45s.
SEL
2 sec. ESP VOL

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Front panel controls
Controls behind faceplate
How to select MP3 files
Searching Track:
• Press “AS/PS”, then search track is activated.
• Press “AUDIO” button, then the first digit will flash.
• Rotary “VOL knob to right or left”, select first digit desired.
• Press “AUDIO” button, then the first digit is fixed and second digit will flash.
• Rotary “VOL knob to right or left”, select 2’nd 3’rd respectively.
• Then automatically the song selected will start.
Searching File Name:
• Press “AS/PS” twice, then file search is activated.
• Press “AUDIO” button, then the first directory is displayed.
• Rotary “VOL knob to right or left”, you can select the desired directory.
• Press “AUDIO” button again, then the directory is fixed and the first file name is displayed.
• Rotary “VOL knob to right or left”, you can select the file you want.
• Press “AUDIO” button, then the song selected will start.
Searching Character:
• Press “AS/PS” 3 times, then character search mode is activated.
• Press “AUDIO” button, then “A” character is displayed.
• Rotary “VOL knob to right or left”, you can select the desired letter.
• Press “AUDIO” button longer than 2 sec.
• The song with the same character you selected is displayed.
• Rotary “VOL knob to right or left”, you can select the desired song.
• Press “AUDIO” button, then the song selected will start.
RESET
AUX IN
CD Loading/unloading slot
LED This LED flashes when the faceplate is
removed.
RESET Press this button with a ballpoint pen or other thin object.
The reset button is to be activated for the following reason:
Initial installation of the unit when all wiring is completed.
All the function button do not operate.
Error symbol on the display.
NOTE: If the unit does not function properly after you have
pressed the RESET button, clean the socket and the connec-
tor on the rear of the front panel with a cotton swab soaked
in isopropyl alcohol and try again.

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AUX IN
USB and front side AUX IN operations
* IMPORTANT INFORMATION:
BECAUSE OF THE GREAT VARIETY OF PRODUCTS WITH USB PORTS AND THEIR SOMETIMES QUITE
MANUFACTURER-SPECIFIC FUNCTIONS WE CAN NEITHER GUARANTEE THAT ALL DEVICES WILL
BE RECOGNIZED NOR THAT ALL OPERATING OPTIONS THAT ARE POSSIBLE IN THEORY WILL
ACTUALLY WORK
CD MULTI ON/OFF
SEL
2 sec. MULTI
ESP SEL VOL
CD MULTI SECTION MODE When press AUDIO button for more than 2
seconds, it is activated as selecting mode of these function.
CD MULTI ON/OFF mode is selected by rotary VOL left or right
CD MULTI ON: Read multi section CD.
CD MULTI OFF: Read first section only.
USB Port
Enhanced control of connected Portable Media such as “iPod**”,
Flash Drives and digital MP3 Players, by using function keys on
the main unit or the remote control unit.
This unit features the latest ID3 Tag support, which allows you
to see the song’s name and which folder it’s located in, on the
LCD display.
AUX IN
Convenient easy to use front “AUX IN” input jack, allows easy
connection of Portable Media and other digital MP3 Players.
For iPod Use: ** You will need to have a IPC-3 cable to
make this unit control an iPod.
You will need to have a IPC-3 cable to
make this unit
c
ont
r
ol
r
r
an iPod
.

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Remote controls functions
POWER Use to turn the CD receiver ON or OFF
SEL Turning the VOL knob Right or Left, you can adjust
VOL/BASS/TREB/BAL/FAD. To select other functions, press the SEL
button shortly until the desired functions is shown on the display.
VOLUME Use to increase or decrease volume level.
SOURCE Press to choose desired audio source
(Radio, CD or Aux in).
TUNE/SEEK and
In Radio mode, press shortly to make
manual tuning,
press and hold to engage automatic
seek function.
In CD mode, press and release to
advance to next
track or to return to the beginning of
the current track
(track number will be displayed).
Press and hold to fast forward or
reverse, play will
begin at the point when you release the
button.
DISPLAY To set clock: Press and hold
this button,
then the time will be flashing. By press
VOL button UP adjust hours and VOL
button DOWN adjust minutes.
AS/PS Use to automatically scan and
place six strong stations into memory.
SHUFFLE Press to play ALL tracks on the CD in random order.
PAUSE Press to pause CD playback. Press again to resume
playback.
SCAN Press this button to hear the first several seconds of
each track of the disc is played. Press again to stop intro and
listen to track.
REPEAT Press and release to continuously repeat same track).
Press again to stop repeat cycle.
BAND Press this button to select the desired band. Selection is
made in regular sequence as FM-AM.

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Here is a listing of current Bluetooth Mobile phones:
How to use Bluetooth in your Car Audio
1. You need to connect your mobile phone and car audio by pairing.
A. Press (+) button in Bluetooth Remote Box longer than 6 seconds. The LED
in Remote Box will blink fast. This mode is Pairing mode stage.
Note: To deactivate Pairing, Press (+) again longer than 3 seconds. LED will
stop blinking.
B. Turn on the Bluetooth connection of the mobile phone. Perform Add
Bluetooth device. The mobile will search for any Bluetooth devices within
the range. Select “NAME_HF” and enter Passkey: “0000” to connect to the
car audio. (Please refer to the instruction manual of your mobile phone
for Bluetooth Pairing. Your mobile phone should have Bluetooth function
otherwise can not do the pairing).
2. After successful pairing, the LED in Bluetooth Remote will blink 1-2 times every 4 sec. This
unit is in active mode waiting for incoming call.
3. You can hear ring tone from the car’s speaker if there’s an incoming call. Press TALK button
once to receive call. Press TALK button longer than 2 seconds will disconnect the call.
4. You can talk through Bluetooth Remote Mic and listen through car’s speaker and not through
your mobile. When talking, the LED in Bluetooth Remote is always on. You can adjust speaker’s
volume level using VOL +/- button.
5. To hang up, press TALK button once. Unit switch back to active mode again.
6. In active mode, press TALK button twice will redial last outgoing called number.
Brand Samsung BlackBerry SE SE SE SE SE SE SE SE SE SE Siemens Siemens
Model D608 8600G T68i T610 T630 P800 P900 P910i K700i K750i W800i W900i S55 S65
Checked
BHF111 Y Y Y Y Y Y Y Y Y Y Y Y Y Y
Brand Ericsson Ericsson Motorola Motorola Motorola Nokia Nokia Nokia Nokia Nokia Nokia Nokia Nokia Nokia Nokia
Model R520m T39 E398 V3 E680i 8910 6310i 6600 N-gage 6260 6230 6680 3230 6280 N70
Checked
BHF111 Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
only support
HSP
only support HSP
only support HSP

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GREY +
GREY/BLACK –
FRONT
RIGHT
SPEAKER
VIOLET +
VIOLET/BLACK –
REAR
RIGHT
SPEAKER
FRONT
LEFT
SPEAKER
REAR
LEFT
SPEAKER
+ WHITE
– WHITE/BLACK
+ GREEN
– GREEN/BLACK
ISO A/B PLUG
AMP TURN
ON LED BLUE
BLUE/WHITE
IGNITION SWITCH (12 V)
RED
CONSTANT
12 VOLTS YELLOW
BLACK
GROUND (–)
POWER ANTENNA
L (WHITE)
SUB WOOFER
LINE IN
R (RED)
L (WHITE)
LINE OUT
(REAR)
R (RED)
LINE OUT
(FRONT)
L (WHITE)
ANTENNA
CONNECTOR
ISO CONNECTOR
R (RED)
B
A
BLUETOOTH
MICROPHONE
Electrical connections

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Specifications
638BA
MP3-Compatible AM/FM CD Receiver
CD/MP3 PLAYER
Signal to Noise Ratio > 60dB
Channel Separation > 45 dB
Frequency Response 20Hz - 20 kHz
RADIO
FM Section:
Frequency range 87.5-107.9 MHz
Intermediate frequency 10.7 MHz
Sensitivity 3 μV
Stereo separation 30 dB
Signal to noise ratio 50 dB
Channel step 200 kHz
AM Section:
Frequency range 530-1710 KHz
Intermediate frequency 450 KHz
Usable Sensitivity 32 dBμV
TONE CONTROLS
Bass (at 100Hz) +/- 10 dB
Treble (at 10kHz) +/- 10 dB
LINE-OUT
Output 5 V (max.)
Impedance 10kOhm
AMPLIFIER
Maximum output power 80 watts x 4 channels
GENERAL
Power Supply 12V DC (10.8-15.6V allowable)
Chassis dimensions 7” x 6-1/4” x 2” (178 x 159 x 51 mm)
Weight 4.4 lb. (2 kg)
Instructions on environment protection
Do not dispose of this product in the usual household garbage at the end of its life-
cycle; hand it over at a collection point for the recycling of electrical and electronic
appliances. The symbol on the product, the instructions for use or the packing will
inform about the methods for disposal.
The materials are recyclable as mentioned in this marking. By recycling, material re-
cycling or other forms of reutilization of old appliances, you are making an important
contribution to protect our environment.
Please inquire at the community administration for the authorized disposal location.