Boss Audio Systems 637UA User manual

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Thank you for purchasing this car audio product.
Please read this manual carefully before operating this car audio product.
Please keep this manual for future use. It will be helpful to you if you are encounter any
operational problem.
WARNING!
To reduce the risk of fire or electric shock, do not use the unit in the rain or moisture
environment.
To prevent direct exposure to laser beam, do not try open the enclosure.
Visible and invisible laser radiation when open and interlocks defeated.
To protect our environment, do not dispose of electrical equipment in the domestic waste.
Please return any electrical equipment that you will no longer use to the collection points
provided for their disposal.
This helps avoid the potential effects of incorrect disposal on the environment and human
health. This will contribute to the recycling and other forms of reutilization of electrical and
electronic equipment. Information concerning where the equipment can be disposed of can
be obtained from your local authority.
Selecting fine audio equipment is only the start of your musical enjoyment.
Now it is time to consider how to maximize the enjoyment you will get from
knowing how to work your new car stereo receiver.
We hope you enjoy using this product and encourage you to always listen at
a moderate, safe sound level to avoid any possible hearing damage or loss.
If you listen to excessively loud sound over time, your hearing can adapt to
higher volumes and what sounds "normal" to you may be quite harmful and
can cause you to have permanent hearing loss. So please practice "safe sound"
and always listen at moderate sound levels only.
Start with your volume control at the lowest setting, and slowly increase the level
until you can hear it comfortably and clearly, free from distortion.
Once you have established this comfortable sound level, leave it there.
Preface
CONNECTOR A
1.
2.
3.
4. Memory +12V
5. Auto Antenna Output
6.
7. 12V (To Ignition Key)
8. GROUND
CONNECTOR B
1. Rear Right Speaker (+)
2. Rear Right Speaker (-)
3. Front Right Speaker (+)
4. Front Right Speaker (-)
5. Front Left Speaker (+)
6. Front Left Speaker (-)
7. Rear Left Speaker (+)
8. Rear Left Speaker (-)
RCA LINE OUTRCA LINE OUTRCA LINE OUT
RED R
WHITE L
WIRES CONNECTION
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ISO SOCKET SKETCH
FUSE 7.5 A
ISO SOCKET ANTENNA JACK
SPECIFICATION
GENERAL
Supply Voltage DC 12 V. Negative Ground
Current Consumption Max.7A
Power Output 60Watts X 4ch
Number of channels 2 Channels, Stereo
Unit Dimensions 178[W] X 165[D] X 50[H] mm.
FM SECTION
Frequency range 87.5MHz -107.9MHz
Effective sensitivity 3uV.
I.F Frequency 10.7MHz.
AM SECTION
Frequency range 530KHz - 1710KHz
Effective sensitivity 40dB.
I.F Frequency 450KHz
RCA LINE OUT
Output 1000mV @ CD MAX.
CD PLAYER
System MP3 Audio System.
Suitable CDs MP3, WMA, CD,CD-R,CD-RW Disc
Frequency characteristics
S/N Ratio to CD [1KHz]
20Hz - 20kHz +/- 3dB
20Hz - 20kHz +/- 3dB
-80dBA

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LOCATION AND FUNCTION OF CONTROLS
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1 & 2.SEL(MENU)BUTTON ANDVOL KNOB
a) Press the SEL button briefly, it is activated as selecting each mode of E. VOL.
-> VOLUME ->BASS ->TREBLE -> BALANCE ->FADER ->
When selecting a desired audio mode, rotate the VOL knob to adjust the
audio effect.
In each mode,the waiting timeis about 5seconds, and thetime waiting time
is over, it returns to the last display mode of tuner or CDP mode.
The control mode of E.VOL isoperated with following numeric display.
- VOL: (MIN)00, 01,......46, 47(MAX).
- BASS/TRE: -07, -06,...,00,...+06,+07
- BAL: 0LR9, 1LR9, ..., 9LR9,..., 9LR1, 9LR0
- FAD: 0FR9,1FR9, ..., 9FR9,..., 9FR1, 9FR0
b) When pressed and hold for more than 2 seconds, it is activated as cyclical
mode of following functions for user’s selection.
->BEEP (ON/OFF) -> USER SET(FLAT/CLASSIC/ROCK/POP)
->VOL(LAST/DEFA) ->CLK(ON/OFF)->CLK(12/24)mode.
When selecting a desired audio mode, rotate the VOL knob to adjust the
audio effect.
TROUBLE SHOOTING
Before using the check list please make all the connections first.
If you still have questions after going through the checklist, please consult
your local customer service representative.
Common Symptoms
There is no power.
The CDs cannot
be loaded.
Cause
The fuse has blown.
Presence of CD disc inside the player
Inserting the disc in upside down
The surface of CD is extremely dirty
or it is damaged.
Temperature inside the car is too
high.
The volume control is set too low.
There is no sound.
The operation keys
do not work
The sound of the
CD player skips
The antenna cable is not connected. Insert the antenna cable firmly into the
antenna socket of the device.
No radio reception.
1.The built-in microcomputer is not
operating properly due to noise
2.Front panel is not properly fix into
its place
1. Switch the device off and on again. Or press
the RESET button to resume the program.
2. Reinstall the front panel
The device has not been correctly
connected.
The installation angle is more than
30 degrees
Wait until the road becomes smoother before
playing the CD.
Adjust the installation angle to less than 30
degrees
Turn up the volume properly.
Check the power and ground connection
according to the wiring diagram.
Cool off until the ambient temperature returns
to normal
Clean the CD or try another CD, if this works
correctly, the first CD is properly damaged.
Insert the compact disc with the label facing
upward
Remove the disc in the player then put a new
upward
Replace another fuse according to the wiring
diagram.
The car ignition is switched off. If the power supply is properly connected to
the car accessory, switch the ignition key to
ON or " ACC" " " .
Solution
The device does
not work correctly
(EJECT, LOAD,
PLAY)
In automatic search
mode the radio does
not stop at a trans-
mitting station.
Tune in to a radio station manually.The transmission signals are too
weak.
The CDs are loaded
only halfway into
the CD tray.
The transport screws have not been
removed.
Remove the transport screws before using.
The surface of the road is uneven.
The surface of CD is extremely dirty
or it is damaged.
Clean the CD or try another CD, if this works
correctly, the first CD is properly damaged.

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BEEP ON/BEEP OFF
BEEP ON mode: The beep is generated when any key is pressed.
BEEP OFF mode: The beep sound is disabled.
VOL LAST/VOL DEFA
VOL LAST: The radio switches onat the actualvolume it hadwhen it waslast
switched off.
VOL DEFA: After pressing SEL button, AVOL will be displayed. Then you can
pre-select a constant switch-on volume by using the VOL knob.
CLK ON/OFF
CLK ON: Clockwill always showon the displaywhen power off.
CLK OFF: Clockwill disappear onthe display whenpower off.
3. POWER ON/OFF & MUTE
When the unit is power off, the unit comes to on by pressing any button except
the EJECT and the RELEASE button.
When the unitis power on,press and holdthe power buttonfor more than0.5
seconds, the unit goes into power off mode.
When the unitis power on,press the powerto switch theMUTE state on/off.
4. LCD Display
5. CD SLOT
6&7. TUNE, SEEK, TRACK, SKIP UP / DOWN BUTTONS
a) During RADIO mode:
Press the >>| or |<< button briefly to manual tune up/down for the desired
radio station frequency step by step.
Press and hold the >>| or |<< button for longer 0.5 seconds, to automatically
tune up/down for the radio station frequency of strong signal.
b) During disc, USB playback mode:
Press the >>| button brieflyto play nexttrack.
Press the |<< button briefly to play the current track from the beginning of it
if the playing time ismore than 2seconds.
Press the |<< button briefly to playthe previous trackif the playing time is
less than 2seconds.
Press the >>| or |<< button andhold to skipforwards or backwards,release
to resume normalplayback.
8. PRESET STATION MEMORY AND TOP/>||, INT, RPT, RDM BUTTONS
a) During radio mode:
Go to any preset station by pressing one of the 6 preset station buttons (1-6).
If one ofthese buttons ispressed for morethan 2 seconds,the station currently
being listened to will be memorized into the selected preset button.
b) During disc, USB mode:
1) Press the TOP/ >|| button briefly to interrupt the playback of the disc or USB.
Press again toresume normal playbackof the disc or USB.
Press the TOP/>|| button and hold for approximately 0.5 seconds to play the
first track of the disc or USB.
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CARE FOR USING CD'S:
1. To keep the disc clean:
Before playing a disc, wipe it off with a clean, dust-free cleaning cloth.
Wipe the disc outwards from the disc center.
2. When one has already been inserted. Doing so may damage the unit
Do not attach any sticker or adhesive tape on the disc.
Handle the disc by its edge to keep the disc clean and do not touch the surface.
. Insert a disc
with labeled surface up, or it will damage the unit.
3. Do not expose the disc to direct sunlight or nearby heat sources such as heating
vents, caliduct which can cause the disc to warp.
Do not leave disc in a car if it is parked in direct sunlight as that will lead to a
considerable rise in the temperature inside the car.
4. Do not use any secondhand or rented disc, usually, there is glue on the surface of
those discs, it will stop the unit working and damage it.
5. Always store the disc in its case for protection. Scratched up discs will produce poor
sound performance and cause CD player to skip.
6. In raining day or wet area, the moisture may form on the disc or the optical parts,
the playback may not be possible. If moisture forms on the disc, wipe it off with a
soft cloth.
If moisture forms on the optical parts of the unit, allow the unit to sit for about one
hour with power on.
7. Do not use solvents such as benzine or thinners. Commercially available cleaners
or anti-static spray will damage the unit.
About CD-R/CD-R/W discs:
In addition to commercially-recorded audio CD's, this unit can play CD-R and
CD-R/W discs. Insome cases, particularlywhen recorded on older CD burners,
some CD-R and CD-R/W discs may not play. Also, whenever you are recording
a CD for playback in this receiver, it is recommended that you record at 24x or
slower speed for CD-R and 4x or slower for CD-R/W to achieve higher signal
quality and better playback performance.

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2) Press the INT button to sample the first 10 seconds part of each track, and the
INT ON will be visible on the LCD display.
In the process of INT, pressINT button again to stop sampling and to continue
playing the currenttrack, and theLCD will displayINT OFF.
3) Press the RPT button once toplay the currenttrack repeatedly, and theRPT
ONE will be visible on the LCD display.
During MP3/WMAdisc or USBmode, press theRPT button twice
continuously to play the current folder repeatedly, and the RPT ABM will be
visible on the LCD display.
In the process of RPT, press RPT button again to stop playing repeatedly
mode and theLCD will displayRPT OFF.
4) Press the RDM button to play all tracks on disc in random order, and the
RDM ON will be visible on the LCD display.
In the process of RDM, press RDM button again to stop playing in random
order and theLCD will displayRDM OFF.
5) Press the -10 and +10button to move up and down10 tracks at a time.
When the remained total tracks is lack of 10, the both buttons are inactively.
9. BAND AND LOC BUTTON
In radio mode,press the BND button briefly to select the radio broadcasting
band you would like to hear. The AM/FM band is toggled cyclically through the
tuning bands:
->FM 1-> FM 2 -> FM 3 -> MW1->MW 2 ->.
Press and hold the BND button to select LOCAL/DX mode.
Note: This button is only for FM reception. In AM mode, LOC is void.
10. MODE BUTTON
Press the MODE button to change among tuner (radio), disc (when a disc is
loaded), USB (when an USB stick is inserted) and AUX mode.
11. EJECT KEY
In the power on state, the loaded disc can be ejected by pressing the EJ key.
12. LOUDNESS BUTTON
When press briefly, the LOUD mode is turned on, its to enhance the bass sound
effect when the volume level is low.Press again tocancel the loudnesseffect.
13. AS/PS BUTTON (Auto-storage /Preset scan)
During radio mode:
1) when press and hold for more than 1 second, the radio searches from the
current frequency andchecks the signalstrength level until6 station are
found. And then the 6 stations frequency are preset to the corresponding
preset memory numbered bank. The auto-storage operation is implemented
in the each selected band. When the auto-storage operation is finished, the
radio execute the Preset Scan.

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2) when press briefly, the radio searches for each preset station in the current
band and holds at that preset number for 5 seconds with releasing mute, and
then search again.
During MP3/WMAfile in disc or USB mode:
1) In TRACK SEARCH mode, the LCD will display TRK T 000 and flash the
biggest digit 0 that the USBstick contain. (if the number of tracks is less than
100 and more than 9, it will be TRK 00) Then rotate the VOL knob to select the
number of the flashing digit from 0 ~ 9. Then press SELbutton to confirm the
number and flash next smaller digit 0.
With the same means, select the number of the flashing digit. After finishing
selecting the number of all flashing digit, press SEL button to play the track of
the selected serial number.
2) In FIRST CHARACTER SEARCH mode, the LCD will display A--......, If there
are files namesits first character areA ,the ......is the first file name itsfirst
character is Aby the order of A~Z and 0~9; otherwise, the ......is NONE. Then
rotate the VOL knob to select file’s first character by the order of A~Z and 0~9.
Finally press SEL button to play the selected file.
3) In DIRECTORY SEARCHmode, the LCDwill display theroot folder(if there is
not the rootfolder, itwill find aroot folder namedROOT). Then rotate the VOL
knob to selectyour desired folderand then press>> | or |<< button to select
your desired track in the folder.
Finally press SELbutton to playthe selected track.
14. ST/MO BUTTON
In FM mode, press the ST briefly to select stereo or mono sound mode.
15.CLK BUTTON
Press the CLK button briefly to display time for 5 seconds on the display, and
then returns to its previous display unless the button is pressed again.
Then press the CLK buttonand hold formore than 1second until thereal time
flashes on the display. Then you can adjust HOUR or MINUTE by rotate the
VOL knob.
16.AUX INPUT JACK
Press the mode button to select auxiliary input playing mode. Then you can
connect any matchedexternal audio deviceto this socket. Use the volume
knob to adjust volume.
17.USB SOCKET
In order to play the file in the USB stick, turn over the plastic cover cap then
insert the USB stick into the USB socket. The system will change into the
USB mode automatically, and then play the first file in the USB.
When no needing to do USB operation, please cover the plastic cover cap.
18. RELEASE BUTTON
Press the RELbutton to releasethe front controlpanel from theunit chassis,
then pull itup a littleto remove fromthe unit chassis.
When the front control panel is removed the LED indicator flashes.
19. RESET BUTTON
Before operating the unit for the first time, or after replacing the car battery or
changing the connections.Youmust reset theunit.
Press this button with acuspidal object. This operation willerase the clock
setting and somestored contents.