Optimus Portable CD Player CD 3790 User Manual

42-5080.fm Page 1 Thursday, August 12, 1999 1:25 PM  
Cat. No. 42-5080  
OWNER’S MANUAL  
Please read before using this equipment.  
CD-3790  
Portable Compact Disc Player  
with Digital Anti-Shock  
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Cue — lets you cue a track for play at a  
later time.  
Important: You need a pair of stereo  
headphones, earphones, or amplified  
speakers, or a home audio or autosound  
system to use your CD player. Your lo-  
cal RadioShack store carries a complete  
line of headphones, earphones, speak-  
ers, and audio systems.  
Intro Scan — scans and plays the first  
10 seconds of each track, so you can  
find a specific track.  
Auto Power On/Off — automatically  
turns on the CD player when you press  
CDs that can be played on this CD play-  
er have this mark on them:  
PLAY/PAUSE  
, and turns it off when you  
or 2 minutes after it  
STOP/CLEAR  
press  
finishes playing, to help preserve battery  
life.  
Hold — prevents accidentally changing  
the CD player’s control settings during  
play and preserves battery life by lock-  
ing most controls.  
The CD player’s advanced technology  
makes it simple to operate. But, be sure  
you read this Owner’s Manual complete-  
ly so you can take advantage of all its  
advanced features.  
Resume — lets you resume listening to  
the track that was selected when you  
stopped playing a CD.  
We recommend you record your CD  
player’s serial number here. The num-  
ber is inside the CD player’s battery  
compartment.  
Three Power Sources — let you power  
your CD player from two standard or re-  
chargeable nickel-cadmium AA batter-  
ies, your vehicle’s battery using the  
supplied DC adapter, or standard AC  
power using an optional AC adapter.  
Serial Number __________________  
Power/Charging Jack  
lets you  
charge nickel-cadmium batteries with-  
out removing them from the CD player.  
Seven-Hour Battery Life — lets you  
play your CD player for up to seven  
hours on just two AA batteries.  
5- or 3-Inch CD Compatible — lets you  
play either size CDs on your CD player.  
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This CD player is made and tested to  
meet exacting safety standards. It meets  
FCC requirements and complies with  
safety performance standards of the  
U.S. Department of Health and Human  
Services.  
FCC INFORMATION  
This equipment complies with the limits  
for a Class B digital device as specified  
in Part 15 of FCC Rules. These limits  
provide reasonable protection against  
radio and TV interference in a residential  
area. However, your equipment might  
cause TV or radio interference even  
when it is operating properly. To elimi-  
nate interference, you can try one or  
more of the following corrective mea-  
sures:  
Warnings:  
• This CD player employs a laser light  
beam. Only a qualified service per-  
son should remove the cover or  
attempt to service this device, due  
to possible eye injury.  
• Reorient or relocate the receiving  
antenna  
• The use of controls, adjustments, or  
procedures other than those speci-  
fied herein might result in hazardous  
radiation exposure.  
• Increase the distance between the  
equipment and the radio or TV  
• Use outlets on different electrical cir-  
cuits for the equipment and the  
radio or TV  
Consult your local Radio Shack store if  
the problem still exists.  
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CONTENTS  
Powering the CD Player ...................................................................................... 6  
Using Batteries ................................................................................................ 6  
Recharging Nickel-Cadmium Batteries ..................................................... 7  
Using Vehicle Battery Power ........................................................................... 8  
Using AC Power .............................................................................................. 9  
Connections ....................................................................................................... 10  
Connecting Earphones/Headphones ............................................................ 10  
Listening Safely ...................................................................................... 10  
Traffic Safety ........................................................................................... 10  
Connecting Amplified Speakers .................................................................... 11  
Connecting to a Home Audio System ........................................................... 11  
Connecting to an AutoSound System ........................................................... 11  
Operation ............................................................................................................ 13  
Loading a CD ................................................................................................ 13  
Playing a CD ................................................................................................. 13  
Viewing the Elapsed Time ...................................................................... 14  
Turning E-Bass On and Off ........................................................................... 14  
Audible Search .............................................................................................. 14  
Automatic Search Music System (ASMS) ..................................................... 15  
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Digital Anti-Shock System (DAS ) ................................................................. 15  
Pause/Cue ..................................................................................................... 15  
Repeat Play ................................................................................................... 16  
Random Play ................................................................................................. 16  
Programmed Play .......................................................................................... 16  
Intro Scan ...................................................................................................... 17  
Resume ......................................................................................................... 18  
Locking the Controls ...................................................................................... 18  
Troubleshooting ................................................................................................. 19  
Care and Maintenance ....................................................................................... 20  
Replacing the DC Adapter’s Fuse ................................................................. 21  
CD Care Tips ................................................................................................. 21  
Specifications .................................................................................................... 22  
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POWERING THE CD PLAYER  
You can power your CD player from any  
of these sources:  
Follow these steps to install the batter-  
ies.  
• two AA alkaline batteries (not sup-  
plied)  
• two rechargeable AA nickel-  
cadmium batteries (not supplied)  
• vehicle battery power using the sup-  
plied DC adapter  
• standard AC power using an AC  
adapter (not supplied)  
1. Press down on the battery compart-  
ment cover and slide it in the direc-  
tion of the arrow on the cover, then  
lift the cover.  
Note: The CD player senses whether or  
not the batteries you install are rechar-  
gables, and turns on the charging circuit  
or disconnects the batteries accordingly.  
Caution: The battery compartment  
cover is attached to the CD player.  
Do not try to remove it.  
2. Put two AA alkaline batteries or two  
AA nickel-cadmium batteries in the  
battery compartment, as indicated  
by the polarity symbols (+ and –)  
marked inside.  
USING BATTERIES  
You can power your CD player from two  
AA alkaline batteries (such as Ra-  
dioShack Cat. No. 23-552) or two re-  
chargeable AA nickel-cadmium bat-  
teries (such as Cat. No. 23-125).  
Note: Before you use the CD player  
with nickel-cadmium batteries, you  
need to charge them, either in an  
external battery charger (such as  
Cat. No. 23-134) or in the CD player  
(see “Recharging Nickel-Cadmium  
Batteries” on Page 7).  
Cautions:  
• Always use fresh, or freshly  
charged, batteries of the required  
size and recommended type.  
• Do not mix old and new batteries,  
different types of batteries (stan-  
dard, alkaline, or rechargeable  
nickel-cadmium), or rechargeable  
batteries of different capacities.  
3. Close the battery compartment  
cover.  
When  
flashes on the display, the  
sound distorts, or the volume weakens,  
replace or recharge the batteries.  
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Cautions:  
Follow these steps to charge nickel-  
cadmium batteries in the CD player.  
• If you will not be using the CD player  
with battery power for more than a  
month, or if you plan to use only AC  
or DC power, remove the batteries.  
1. Connect an AC adapter or the sup-  
plied DC adapter to your CD player  
(see “Using AC Power” on Page 9  
or “Using Vehicle Battery Power” on  
Page 8).  
• Dispose of old batteries promptly  
and properly.  
2. With rechargeable batteries in-  
stalled and the CD compartment  
Recharging Nickel-Cadmium  
Batteries  
STOP/CLEAR  
cover closed, press  
.
CHG flashes on the display. Then  
CHG CHG CHG appears and the CD  
player starts to recharge the batter-  
ies.  
If you connect the supplied DC adapter  
(see “Using Vehicle Battery Power” on  
Page 8) or an AC adapter (see “Using  
AC Power” on Page 9) to the CD player,  
you can set the CD player to charge  
nickel-cadmium batteries while they are  
inside the CD player’s battery compart-  
ment.  
It takes about 3 hours to charge  
new or fully discharged nickel-  
cadmium batteries. Subsequent  
charges take 2–3 hours.  
Cautions:  
• Use only the supplied DC adapter or  
an AC adapter that meets the speci-  
fications in “Using AC Power” on  
Page 9 to recharge the batteries in  
the CD player. Other adapters could  
damage your CD player or the bat-  
teries.  
Note: During recharging, the auto  
power on/off feature is disabled.  
3. When the batteries are fully  
charged, the CD player automati-  
cally stops charging them and turns  
off. Disconnect the AC or DC  
adapter.  
• Do not use the CD player or open  
the CD compartment cover while  
you are charging nickel-cadmium  
batteries.  
• Nickel-cadmium batteries charge  
more efficiently if the temperature is  
above 40°F (4.5°C) and below 90°F  
(32°C).  
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Important: Your CD player is capable of  
using nickel-cadmium batteries. At the  
end of the batteries’ useful life, they  
must be recycled or disposed of proper-  
ly. Contact your local, county, or state  
hazardous waste management authori-  
ties for information on recycling or dis-  
posal programs in your area. Some  
options that might be available are: mu-  
nicipal curbside collection, drop-off box-  
es at retailers such as your local  
RadioShack store, recycling collection  
centers, and mail-back programs.  
Follow these steps to connect the CD  
player to your vehicle’s battery power.  
1. Insert the DC adapter’s barrel plug  
DC IN 6V  
into the CD player’s  
jack.  
2. Make sure the DC adapter’s tip is  
screwed in tightly, then plug the DC  
adapter’s other end into your vehi-  
cle’s cigarette-lighter socket.  
USING VEHICLE BATTERY  
POWER  
Note: If the CD player does not operate  
when you use the DC adapter, unplug  
the cord from the cigarette-lighter socket  
and clean any ashes or debris from the  
socket.  
You can power the CD player from your  
vehicle’s battery power with the supplied  
DC adapter.  
Cautions:  
• The supplied DC adapter supplies 6  
volts and delivers at least 500 milli-  
amps. Its center tip is set to positive,  
and its plug correctly fits the CD  
DC IN 6V  
player’s  
jack. Using a DC  
adapter that does not meet these  
specifications could damage the CD  
player or the DC adapter.  
• When you finish using the CD  
player, always unplug the DC  
adapter from the cigarette-lighter  
socket before you disconnect it from  
your CD player.  
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Follow these steps to connect the CD  
player to AC power.  
USING AC POWER  
You can power the CD player from a  
standard AC outlet using an optional AC  
adapter such as Cat. No. 273-1664.  
Cautions:  
• You must use an AC adapter that  
supplies 6 volts and delivers at least  
500 milliamps. Its center tip must be  
set to positive, and its plug must cor-  
1. Insert the AC adapter’s 4.0 mm  
outer diameter/1.7 mm inner diame-  
ter barrel plug into the adapter’s  
cord, setting TIP to + (positive).  
DC IN 6V  
rectly fit the CD player’s  
jack. The recommended adapter  
meets these specifications. Using  
an adapter that does not meet these  
specifications could damage the CD  
player or the adapter.  
2. Set the AC adapter’s voltage switch  
to 6V.  
3. Insert the AC adapter’s barrel plug  
• When you finish using the AC  
adapter, unplug it from the AC outlet  
first, then disconnect it from the CD  
player.  
DC IN 6V  
into the CD player’s  
jack.  
4. Plug the other end of the adapter  
into a standard AC outlet.  
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CONNECTIONS  
You can listen to your CD player by con-  
necting earphones/headphones or am-  
plified speakers to the player’s PHONES  
jack, or by connecting a home audio or  
autosound system to the CD player’s  
LINE OUT jack.  
Listening Safely  
To protect your hearing, follow these  
guidelines when you use earphones or  
headphones.  
• Set the volume to the lowest setting  
before you begin listening. After you  
begin listening, adjust the volume to  
a comfortable level.  
Note: If the jacks on your equipment do  
not match the plugs on the supplied Y-  
cable, check with your local RadioShack  
store for the proper cable adapter.  
• Do not listen at extremely high vol-  
ume levels. Extended high-volume  
listening can lead to permanent  
hearing loss.  
CONNECTING  
EARPHONES/  
HEADPHONES  
• Once you set the volume, do not  
increase it. Over time, your ears  
adapt to the volume level, so a vol-  
ume level that does not cause dis-  
comfort might still damage your  
hearing.  
For private listening, you can plug a pair  
of stereo earphones or headphones with  
1
a /8-inch plug (not supplied) into the  
PHONES jack on the CD player.  
Traffic Safety  
Do not wear earphones or headphones  
while operating a motor vehicle or riding  
a bicycle. This can create a traffic haz-  
ard and could be illegal in some areas.  
Even though some earphones and  
headphones let you hear some outside  
sounds when listening at normal volume  
levels, they still can present a traffic haz-  
ard.  
Your local RadioShack carries a wide  
variety of earphones and headphones to  
use with your CD player.  
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CONNECTING AMPLIFIED  
SPEAKERS  
CONNECTING TO AN  
AUTOSOUND SYSTEM  
You can listen to your CD player through  
optional amplified speakers (such as  
Cat. No. 40-1387). Plug the speaker ca-  
You can listen to your CD player through  
your autosound system in one of the fol-  
lowing ways:  
1
ble’s /8-inch plug into the CD player’s  
• If your autosound system has LINE  
IN jacks, connect the supplied Y-  
cable’s 1/8-inch plug to the CD  
PHONES  
jack.  
LINE OUT  
player’s  
jack. Then con-  
nect the Y-cable’s phono plugs to  
your autosound system’s LINE IN  
input jacks.  
CONNECTING TO A HOME  
AUDIO SYSTEM  
You can listen to your CD player through  
your home audio system’s amplifier/re-  
ceiver and full-size speakers. Connect  
• If your autosound system has a CD  
input jack, connect one end of a /8-  
inch stereo patch cable (such as  
Cat. No. 42-2387, not supplied) to  
1
1
the supplied Y-cable’s /8-inch plug to  
LINE OUT  
the CD player’s  
jack. Then  
LINE OUT  
the CD player’s  
jack.  
connect the Y-cable’s phono plugs to  
your audio system’s left and right CD,  
AUX, or TV audio input jacks.  
Then connect the other end to your  
autosound system’s CD INPUT jack.  
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• If your autosound system has a cas-  
sette deck, connect the supplied  
CD-to-cassette adapter’s plug to the  
CD player’s PHONES jack. Then  
insert the adapter’s other end into  
your cassette deck just like a stan-  
dard cassette.  
You can mount your CD player in  
Note:  
your car using an optional mounting  
bracket. Your local RadioShack store  
has a complete line of mounting brack-  
ets and hardware.  
12  
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OPERATION  
Note: To remove a CD, lift up the CD  
while pressing the center hub’s button.  
LOADING A CD  
Caution: To help prevent dust from en-  
tering the CD player, always keep the  
CD compartment cover closed except  
when loading or unloading CDs.  
PLAYING A CD  
Warning: To protect your hearing if you  
are using earphones or headphones, set  
VOLUME to its lowest setting before you  
play a CD.  
1. Set OFF/RESUME/HOLD to OFF.  
Press PLAY/PAUSE  
er automatically turns on and 00 briefly  
flashes on the display. Then and  
the current track number appear and  
Track 1 begins to play.  
. The CD play-  
2. Slide OPEN in the direction of the  
arrow and lift the CD compartment  
cover.  
If you connected an earphone/head-  
phones or amplified speakers to the CD  
player’s PHONES jack, use VOLUME on  
the CD player to adjust the volume.  
3. Carefully place a CD, label side up,  
over the center hub inside the CD  
compartment. Then gently press the  
button in the center hub and the CD  
slides into place.  
Center Hub  
If you connected the CD player to your  
home audio system or autosound sys-  
tem using the LINE OUT jack, you must  
use the home audio or autosound sys-  
tem’s volume control to adjust the vol-  
ume.  
4. Close the compartment cover.  
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If you connected an external power  
source, the CD player’s buttons light un-  
til you turn the CD player off or it turns  
off automatically.  
TURNING E-BASS ON AND  
OFF  
To enhance the bass sound, press  
MEMORY/E-BASS.  
appears on the  
To temporarily stop play, press PLAY/  
display. To turn the bass sound off,  
press MEMORY/E-BASS again.  
disappears from the display.  
PAUSE  
.
flashes. To resume  
play, press PLAY/PAUSE again.  
When the last track finishes playing, the  
CD stops and the display alternately  
shows the total number of tracks and to-  
tal playing time of the CD for about 2  
minutes, then the CD player automati-  
cally turns off. To turn it off sooner,  
press STOP/CLEAR  
.
AUDIBLE SEARCH  
To search forward or backward during  
play, hold down  
or  
. The CD  
plays rapidly and you hear the music at  
a high speed and low volume. The cur-  
rent track’s elapsed time appears on the  
display.  
Viewing the Elapsed Time  
To display the current track’s elapsed  
time, hold down MEMORY/E-BASS for  
about 1 second. Hold down MEMORY/E-  
BASS again to return to the current track  
display.  
Release the button to resume normal  
play.  
If you hold down  
while the  
Note:  
last track is playing, audible search  
starts again at the beginning of that  
same track. If you hold down  
dur-  
ing the first track, audible search stops  
at the beginning of Track 1.  
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To turn on the anti-shock system, set  
DAS OUT . . IN IN  
AUTOMATIC SEARCH  
MUSIC SYSTEM (ASMS)  
to . If the CD player is  
playing a CD, the sound briefly stops,  
then appears on the display and  
You can use ASMS before or during  
regular or programmed play (see “Pro-  
grammed Play” on Page 16) to quickly  
locate any track on a CD.  
the sound continues.  
While the CD is stopped, repeatedly  
press  
or  
to move backward or  
forward to the desired track. Press  
PLAY/PAUSE  
to play the track.  
to return to the  
Note: The CD player consumes addi-  
tional battery power when you use the  
anti-shock system. When you use the  
During play, press  
beginning of the current track. Press  
twice to return to the beginning of  
DAS  
CD player in a stable location, set  
OUT . . IN  
OUT  
to save battery power.  
to  
the previous track. To move to the be-  
ginning of the next track, press  
.
To turn off the anti-shock system, set  
DAS OUT . . IN  
stops, then  
display.  
OUT  
to  
. The sound briefly  
disappears from the  
DIGITAL ANTI-SHOCK  
SYSTEM (DAS )  
2
Your CD player contains special circuits  
to overcome sound skipping problems  
caused by shock or vibration. This  
means you can carry the CD player any-  
where you go or use it in your vehicle.  
When you turn on the anti-shock sys-  
tem, the CD player continuously saves  
40 seconds of music in memory. During  
a shock or vibration that would normally  
make a track skip or pause, the CD play-  
er plays directly from memory.  
PAUSE/CUE  
PLAY/  
To temporarily pause play, press  
PAUSE  
.
flashes on the dis-  
PLAY/PAUSE  
play. Press  
sume play.  
again to re-  
PLAY/PAUSE  
You can also use  
select (cue) a track before playing.  
When the CD player is stopped, press  
to  
or  
to select the track you  
PLAY/  
want to cue. Then press  
Note: Your CD player requires 90 sec-  
onds to store a full 40 seconds of music.  
Before 90 seconds, it will play however  
PAUSE  
twice.  
flashes. When  
you are ready to play the track, press  
PLAY/PAUSE  
again.  
2
much it has stored if the DAS feature is  
necessary.  
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REPEAT PLAY  
RANDOM PLAY  
You can repeat a single track on the CD,  
all tracks on the CD, or a programmed  
sequence (see “Programmed Play” ).  
You can have the CD player play all the  
tracks once in random order, then auto-  
matically stop. To start random play, re-  
PLAY MODE  
peatedly press  
appears on the display.  
until  
PLAY  
To repeat a single track, press  
MODE  
once while the desired track is  
playing.  
continuously replays the track.  
appears, and the CD player  
Note: If you select random play during  
programmed play, the CD player stops  
the programmed sequence and starts  
random play instead.  
To cancel random play, repeatedly press  
PLAY MODE  
until  
disappears.  
PROGRAMMED PLAY  
To repeat all tracks on a CD or in a pro-  
PLAY MODE  
grammed sequence, press  
twice. appears on the display.  
You can program up to 24 tracks from  
the loaded CD to play in any order you  
choose, and you can program the same  
track to play more than once.  
Follow these steps to program and play  
a sequence.  
1. While the CD is stopped, hold down  
MEMORY/E-BASS  
for about 3 sec-  
When the CD player reaches the end of  
the CD or the programmed sequence, it  
returns to the first track and replays all  
the tracks, and does this continuously.  
onds. The display shows the selec-  
tion number (01) and the track  
number (00), and  
flashes.  
2. Repeatedly press either  
or  
To cancel repeat play, repeatedly press  
to display the number of the  
first track you want to program.  
PLAY MODE  
until  
and  
disap-  
pear.  
MEMORY/E-BASS  
3. Press  
to store the  
selected track number. The selec-  
tion number advances by one and  
the track number returns to 00.  
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4. Repeat Steps 2 and 3 for each track  
you want to program, up to 24  
tracks.  
To clear the programmed sequence from  
STOP/CLEAR  
open the CD compartment door.  
memory, press  
twice or  
Note: When you store the 24th track  
in memory, FuLL appears.  
INTRO SCAN  
5. To play the programmed sequence,  
PLAY/PAUSE  
and the first track in the sequence  
plays.  
press  
.
lights  
You can set the stereo to play the first  
10 seconds of each track on the CD, so  
you can find the track you want to listen  
to.  
While the sequence plays, you can  
use  
to move forward or  
to  
To begin scanning, repeatedly press  
move backward.  
PLAY MODE  
until  
appears on the  
6. After the last programmed track  
ends, the CD player stops. To stop  
the CD before the end of the  
display. Intro scan starts from the first  
track.  
STOP/CLEAR  
sequence, press  
.
To return to normal play, repeatedly  
PLAY MODE  
press  
until  
disappears.  
You can replay, check, or add to the pro-  
grammed sequence within 2 minutes af-  
ter play stops. Otherwise, the CD player  
turns off and clears the programmed se-  
quence.  
Note: Intro scan plays the tracks in the  
programmed order if you have pro-  
grammed a sequence.  
You can use  
backward or forward through the tracks.  
and  
to search  
To replay the programmed se-  
PLAY/PAUSE  
quence, press  
.
To check the programmed se-  
MEMORY/E-BASS  
quence, press  
.
The display shows the number of  
the first programmed track. Each  
MEMORY/E-BASS  
time you press  
,
the display shows the number of the  
next track in the sequence.  
To add to the end of a programmed  
MEM-  
sequence, repeatedly press  
ORY/E-BASS  
until track number 00  
appears. Then follow Steps 2 and 4.  
17  
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42-5080.fm Page 18 Thursday, August 12, 1999 1:25 PM  
RESUME  
LOCKING THE CONTROLS  
You can set the CD player to remember  
the track it was playing when you  
stopped the CD or it turned itself off.  
That way, when you play the CD again,  
the CD player resumes playing at the  
beginning of that track.  
You can protect your CD player from ac-  
cidental program changes by locking  
MEMORY/E-BASS PLAY MODE  
,
,
,
.
,
, and  
OFF/RE-  
To lock these controls, set  
SUME/HOLD  
HOLD  
. To unlock them,  
to  
OFF/  
OFF/RESUME/HOLD  
OFF  
to .  
To set the CD player to resume, set  
set  
RESUME/HOLD  
RESUME  
at any time.  
to  
STOP/  
Then, after you have pressed  
CLEAR  
to turn off the CD player, you  
PLAY/PAUSE  
can simply press  
resume play.  
to  
OFF/RESUME/  
To cancel resume, set  
HOLD  
OFF  
or let the CD play to the  
to  
end. Opening the CD compartment cov-  
er within two minutes after pressing  
STOP/CLEAR  
also cancels resume.  
Notes:  
STOP/CLEAR  
• If you press  
very  
close to the beginning or end of a  
track, the CD player might play the  
track before or after that track  
PLAY/  
instead when you press  
PAUSE  
. This is not a malfunc-  
tion.  
OFF/  
• If you load a different CD while  
RESUME/HOLD  
RE-SUME  
,
is set to  
play might not start from Track 1 on  
the new CD. If this happens, press  
STOP/CLEAR  
OFF/RESUME/  
, set  
HOLD  
PAUSE  
OFF  
PLAY/  
to  
, then press  
again.  
18  
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42-5080.fm Page 19 Thursday, August 12, 1999 1:25 PM  
TROUBLESHOOTING  
If you have problems operating your CD player, try these suggestions. If they do not  
solve the problem, contact your local RadioShack store for assistance.  
Problem  
Possible Cause  
Solution  
The CD player does not OFF/RESUME/HOLD is  
Set OFF/RESUME/HOLD  
work.  
set to HOLD.  
to OFF.  
No power.  
Be sure the batteries are  
not weak.  
Make sure an AC adapter  
or the DC adapter is  
properly connected.  
If you are using a DC  
adapter to power the CD  
player, check the adapt-  
er’s fuse. See “Replacing  
the DC Adapter’s Fuse”  
on Page 21.  
A CD is loaded, but the  
CD player does not  
start.  
The CD is loaded  
upside-down.  
Reload the CD, label side  
up.  
The CD is dirty or  
defective.  
Clean the CD and reload  
it, or try a different CD.  
See “CD Care Tips” on  
Page 21.  
The CD’s sound skips.  
The CD is dirty or  
defective.  
Clean the CD and reload  
it, or try a different CD.  
See “CD Care Tips” on  
Page 21.  
Vibration is excessive.  
Set DAS OUT . . IN to IN.  
Place the CD player in a  
different location.  
Moisture has con-  
densed on the pickup  
lens.  
Wait 1 hour for the mois-  
ture to evaporate.  
19  
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42-5080.fm Page 20 Thursday, August 12, 1999 1:25 PM  
CARE AND MAINTENANCE  
Your Optimus CD-3790 Portable Compact Disc Player is an example of superior de-  
sign and craftsmanship. The following suggestions will help you care for your CD play-  
er so you can enjoy it for years.  
Keep the CD player dry. If it gets wet, wipe it dry immediately. Liquids  
might contain minerals that can corrode the electronic circuits.  
Use and store the CD player only in normal temperature environments.  
Temperature extremes can shorten the life of electronic devices, dam-  
age batteries, and distort or melt plastic parts.  
Keep the CD player away from dust and dirt, which can cause prema-  
ture wear of parts.  
Handle the CD player gently and carefully. Dropping it can damage cir-  
cuit boards and cases and can cause the CD player to work improperly.  
Use only fresh batteries of the required size and recommended type.  
Batteries can leak chemicals that damage your CD player’s electronic  
parts.  
Wipe the CD player with a damp cloth occasionally to keep it looking  
new. Do not use harsh chemicals, cleaning solvents, or strong deter-  
gents to clean the CD player.  
Modifying or tampering with the CD player’s internal components can cause a mal-  
function and might invalidate your CD player’s warranty and void your FCC authoriza-  
tion to operate it. If your CD player is not performing as it should, take it to your local  
RadioShack store for assistance.  
20  
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42-5080.fm Page 21 Thursday, August 12, 1999 1:25 PM  
REPLACING THE DC  
ADAPTER’S FUSE  
CD CARE TIPS  
Even though a CD is very durable, you  
should handle it with care.  
If the CD player stops operating, check  
the fuse in the DC adapter’s cigarette-  
lighter plug. If it has blown, follow these  
steps to replace it with a 3-amp, 5 × 20  
mm, fast-acting fuse such as Cat. No.  
270-1054 (not supplied).  
• Keep the CD inside the CD player or  
in its protective case or sleeve when  
you are not playing it.  
• Handle a CD by its edges to avoid  
fingerprints that can prevent the CD  
player’s laser beam from accurately  
reading the CD. Your local Ra-  
dioShack store sells a suitable CD  
cleaner kit.  
Caution: Using a fuse that does not  
meet these ratings can damage your CD  
player or the vehicle’s electrical system.  
1. Carefully unscrew the tip of the ciga-  
rette-lighter plug.  
• Do not write on either side of the  
CD, particularly the non-label side.  
(Signals are read from the non-label  
side.)  
• Keep the CD dry. A water drop can  
act as a lens and affect the laser  
beam’s focus.  
2. Remove the old fuse and replace it  
with the new fuse.  
• Never use chemicals such as record  
cleaning sprays, anti-static sprays  
or fluids, benzene or thinner to clean  
CDs. These chemicals will perma-  
nently damage the plastic surface of  
the CD.  
3. Screw the cigarette-lighter plug’s tip  
back onto the body.  
• If a CD skips when you try to play  
it, the CD might be scratched. Your  
local RadioShack store sells a  
Scratch ’n Fix kit (Cat. No. 42-127)  
that might stop the skip. Also see  
“Troubleshooting” on Page 19.  
21  
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42-5080.fm Page 22 Thursday, August 12, 1999 1:25 PM  
SPECIFICATIONS  
AUDIO  
Frequency Response ........................................................... 20–20,000 Hz (±3 dB)  
Dynamic Range ............................................................................................. 80 dB  
Signal-to-Noise Ratio ..................................................................................... 80 dB  
Harmonic Distortion at 1 kHz ........................................................................ 0.07%  
Separation at 1 kHz ....................................................................................... 55 dB  
Wow/Flutter .................................................................................... Not Measurable  
Earphones Output (10% THD at 32 Ohm) ........................................ 7 mW + 7 mW  
Line Output ..................................................................................................... 0.6 V  
SIGNAL FORMAT  
Sampling Frequency ................................................................................. 44.1 kHz  
Oversampling .............................................................................................. 8 Times  
Quantization Number ............................................................ 16-Bit Linear/Channel  
Transmission Bit Rate ............................................................... 4.3218 Mb/Second  
Signal-Processing Rate .......................................................................... 352.8 kHz  
PICK-UP  
Tracking System ....................................................... 3-Beam Tracking Servo Type  
Object Lens Drive System ......................................... 2-Dimensional Parallel Drive  
Optical Source ....................................................................... Semiconductor Laser  
Wavelength .................................................................................................. 780 nm  
GENERAL  
Power Requirements .................................................... DC 3V; Two AA Alkaline or  
Rechargeable Nickel-Cadmium Batteries (not supplied);  
DC Adapter (supplied); or  
AC Adapter such as 273-1664 (not supplied)  
Power Consumption .......................................................................................... 8 W  
2
Battery Life (EIAJ Method) ................................................. 7 Hours (with DAS off)  
Dimensions (HWD) ........................... 11/8 × 51/16 × 53/8 Inches (32 × 129 × 137 mm)  
Weight (without batteries) ................................................................. 9.5 oz (270 g)  
Included Accessories .................... Y-Cable, DC Adapter, CD-to-Cassette Adapter,  
Carrying Pouch  
Specifications are typical; individual units might vary. Specifications are subject to  
change and improvement without notice.  
22  
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42-5080.fm Page 23 Thursday, August 12, 1999 1:25 PM  
NOTES  
23  
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42-5080.fm Page 24 Thursday, August 12, 1999 1:25 PM  
Limited One-Year Warranty  
This product is warranted by RadioShack against manufacturing defects in material and workmanship under  
normal use for one (1) year from the date of purchase from RadioShack company-owned stores and authorized  
RadioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS  
WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FIT-  
NESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO THE DURATION OF THE WRIT-  
TEN LIMITED WARRANTIES CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL  
HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH  
RESPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PER-  
FORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY, INCLUDING,  
BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS OF TIME, DATA,  
PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL  
DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.  
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of incidental or  
consequential damages, so the above limitations or exclusions may not apply to you.  
In the event of a product defect during the warranty period, take the product and the RadioShack sales receipt  
as proof of purchase date to any RadioShack store. RadioShack will, at its option, unless otherwise provided by  
law: (a) correct the defect by product repair without charge for parts and labor; (b) replace the product with one  
of the same or similar design; or (c) refund the purchase price. All replaced parts and products, and products on  
which a refund is made, become the property of RadioShack. New or reconditioned parts and products may be  
used in the performance of warranty service. Repaired or replaced parts and products are warranted for the re-  
mainder of the original warranty period. You will be charged for repair or replacement of the product made after  
the expiration of the warranty period.  
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse, accident,  
misuse, improper or abnormal usage, failure to follow instructions, improper installation or maintenance, alter-  
ation, lightning or other incidence of excess voltage or current; (b) any repairs other than those provided by a  
RadioShack Authorized Service Facility; (c) consumables such as fuses or batteries; (d) cosmetic damage; (e)  
transportation, shipping or insurance costs; or (f) costs of product removal, installation, set-up service adjust-  
ment or reinstallation.  
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  
RadioShack Customer Relations, Dept. W, 100 Throckmorton St., Suite 600, Fort Worth, TX 76102  
We Service What We Sell  
3/97  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
2586-920-0-02  
7A8N  
Printed in Thailand  
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