Boss Audio Systems 638B User manual

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638B

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 SD/MMC 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.

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Release Button

press RELEASE to release

the front panel...

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Front panel controls

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 SEL button for more than 2 sec-

onds, it is activated as selecting mode of these function.

BEEP ON: BEEP sound can hear from speaker when the but-

tons are pressed.

CD MULTI ON/OFF

SEL

2 sec.

MULTI

ESP 12s. / 45s.

SEL

2 sec.

ESP SEL

ESP

SEL BEEP

SEL

2 sec.

MULTI BEEP ON/OFF

VOL

ESP SEL

SEL SEEK

SEL SEL

2 sec.

MULTI BEEP SEEK1 / SEEK 2

VOL

The Liquid Crystal Display will display the current state of the unit.

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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.

SEEK 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.

CD MULTI ON/OFF

SEL

2 sec.

MULTI

ESP 12s. / 45s.

SEL

2 sec.

ESP SEL

ESP

SEL BEEP

SEL

2 sec.

MULTI BEEP ON/OFF

VOL

ESP SEL

SEL SEEK

SEL SEL

2 sec.

MULTI BEEP SEEK1 / SEEK 2

VOL

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Front panel controls

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 or MMC/SD mode.

MUTE Press to silence the receiver. Press again to

return to normal operation.

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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.

CD MULTI ON/OFF

SEL

2 sec.

MULTI

ESP 12s. / 45s.

SEL

2 sec.

ESP SEL

ESP

SEL BEEP

SEL

2 sec.

MULTI BEEP ON/OFF

VOL

ESP SEL

SEL SEEK

SEL SEL

2 sec.

MULTI BEEP SEEK1 / SEEK 2

VOL

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