Optimus Stereo System 13 1288 User Manual

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Cat. No. 13-1288  
OWNER’S MANUAL  
Please read before using this equipment.  
SYSTEM 741  
Mini Stereo Component System  
 
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CASSETTE PLAYER FEATURES  
Warning: This system employs a la-  
ser light beam. Only a qualified ser-  
vice person should remove the cover  
or attempt to service this device, due  
to possible eye injury.  
Auto-Stop — automatically stops the  
cassette tape when it finishes to pro-  
tect the tape and tape-handling parts.  
Multiple Source Recording — lets  
you record from the CD player, radio,  
or an external audio source (such as  
another cassette tape or CD player).  
Warning: To prevent fire or shock  
hazard, do not expose this music sys-  
tem to rain or moisture.  
CAUTION  
Mixed Recording — lets you record  
onto a cassette tape while you talk  
into a microphone and play prerecord-  
ed music from the other cassette  
deck.  
RISK OF ELECTRIC SHOCK.  
!
DO NOT OPEN.  
CAUTION: TO REDUCE THE RISK OF  
ELECTRIC SHOCK, DO NOT REMOVE  
COVER OR BACK. NO USER-SERVICE-  
ABLE PARTS INSIDE. REFER SERVIC-  
ING TO QUALIFIED PERSONNEL.  
Automatic Level Control (ALC) —  
automatically adjusts the recording  
level.  
This symbol is intended to alert you  
to the presence of uninsulated dan-  
gerous voltage within the music  
system’s enclosure that might be of  
sufficient magnitude to constitute a  
risk of electric shock. Do not open  
the music system’s case.  
Consecutive Tape Play — plays one  
side each of two tapes, back to back.  
Normal or High-Speed Dubbing —  
lets you copy tapes at normal or twice  
the normal speed.  
This symbol is intended to inform  
you that important operating and  
maintenance instructions are in-  
cluded in the literature accompany-  
ing this music system.  
!
Note: Most material on compact discs  
and prerecorded tapes is copyrighted.  
Unauthorized duplication of copyright-  
ed material is a violation of the copy-  
right laws of most countries and such  
duplication may result in fines and/or  
imprisonment. Note, however, that in  
the United States, it is not a violation  
of U.S. copyright laws for a consumer  
to use an audio recording device to  
duplicate musical recordings for non-  
commercial (personal) use.  
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CONTENTS  
Connections ......................................................................................................... 6  
Connecting the Speakers ................................................................................ 6  
Connecting an External Audio Source ............................................................. 6  
Connecting an External Antenna ..................................................................... 7  
Connecting Power ........................................................................................... 7  
Connecting Headphones ................................................................................. 8  
Listening Safely ......................................................................................... 8  
Basic Operation ................................................................................................... 9  
Turning On/Off the System .............................................................................. 9  
Adjusting the Balance ...................................................................................... 9  
Using the 3-Band Frequency Equalizer ........................................................... 9  
Using E-Bass ................................................................................................... 9  
Radio Operation ................................................................................................. 10  
CD Player Operation .......................................................................................... 11  
Loading and Playing a CD ............................................................................. 11  
Special CD Player Features .......................................................................... 12  
Skip Search ............................................................................................. 12  
Audible Search ........................................................................................ 12  
Storing/Playing a Programmed Sequence .............................................. 12  
Reviewing a Programmed Sequence ..................................................... 13  
Editing a Programmed Sequence ........................................................... 13  
Erasing a Programmed Sequence .......................................................... 13  
Random Play .......................................................................................... 14  
Cue ......................................................................................................... 14  
Repeat .................................................................................................... 14  
Time Display ........................................................................................... 15  
Cassette Deck Operation .................................................................................. 16  
Loading and Playing a Cassette Tape ........................................................... 16  
Using Fast Forward/Rewind .................................................................... 17  
Using Consecutive Play .......................................................................... 17  
Dubbing and Recording ................................................................................. 17  
Dubbing a Cassette Tape ........................................................................ 18  
Recording from the Radio or CD Player ................................................. 19  
Making a Mixed Recording ..................................................................... 19  
Using an External Audio Source ...................................................................... 20  
Listening to an External Audio Source .......................................................... 20  
Recording from an External Audio Source .................................................... 20  
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Care and Maintenance ...................................................................................... 21  
CD Care Tips ................................................................................................ 22  
CD Player Care Tips ..................................................................................... 22  
Tape Tips ....................................................................................................... 22  
Erasing a Cassette Tape .......................................................................... 22  
Preventing Accidental Recording ........................................................... 23  
Restoring Tape Tension and Sound Quality ........................................... 23  
Cleaning the Tape-Handling Parts .......................................................... 23  
The FCC Wants You to Know ....................................................................... 24  
Specifications .................................................................................................... 25  
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CONNECTIONS  
Note: Complete all other connections  
to the System 741 before you connect  
it to power.  
CONNECTING AN  
EXTERNAL AUDIO  
SOURCE  
You can connect an external audio  
source to your System 741, such as a  
TV, CD player, or cassette deck, so  
you can listen to that source through  
the System 741.  
CONNECTING THE  
SPEAKERS  
Plug the audio source’s left and right  
line level audio wires into the AUX L  
(left, white) and R (right, red) input  
jacks on the back of the System 741.  
(il-  
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1. Press open the pair of terminal  
tabs marked SPEAKER/R (right)  
on the back of the System 741.  
To operate an external audio source  
with the System 741, see “Using an  
External Audio Source” on Page 20.  
2. Insert one speaker’s red wire into  
the red (+) terminal and its black  
wire into the black (–) terminal and  
release the tabs to close the ter-  
minals.  
3. Repeat Steps 1 and 2 to connect  
the other speaker’s wires to the  
terminals marked SPEAKER/L  
(left).  
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CONNECTING AN  
CONNECTING POWER  
EXTERNAL ANTENNA  
After making all other connections,  
plug your system’s AC power cord into  
a standard AC outlet.  
Your System 741 has two built-in an-  
tennas. The AM antenna is internal,  
and the power cord serves as the FM  
antenna.  
(il-  
For improved reception, you can at-  
tach an external FM or VHF TV anten-  
na (not supplied) to the 75-ohm or  
300-ohm terminals on the back of the  
system.  
Caution: Your system’s power cord  
has a polarized plug (one blade is wid-  
er than the other). If you have difficulty  
inserting the plug into the outlet, do  
not force it. Turn the plug over and try  
again.  
(il-  
Note: If you are not connecting an ex-  
ternal antenna, make sure the sys-  
tem’s power cord is fully extended.  
Note: If you use an outside VHF TV  
antenna, you can use a signal splitter  
to connect your radio and TV to the  
same antenna.  
Your local RadioShack store has a  
wide selection of antennas, splitters,  
and connectors.  
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Listening Safely  
CONNECTING  
HEADPHONES  
To protect your hearing, follow these  
guidelines when you use headphones.  
To listen privately, you can connect a  
pair of stereo headphones with a /8-  
inch plug (not supplied). Your local  
RadioShack store has a wide selec-  
tion of stereo headphones.  
1
• Set the volume to the lowest set-  
ting before you begin listening.  
After you begin listening, adjust  
the volume to a comfortable listen-  
ing level.  
To connect headphones, plug the  
• Do not listen at extremely high  
volume levels. Extended high-vol-  
ume listening can lead to perma-  
nent hearing loss.  
PHONES  
headphones into the  
the front panel.  
jack on  
• Once you set the volume, do not  
increase it. Over time your ears  
adapt to the volume level, so a  
volume level that does not cause  
discomfort might still damage your  
hearing.  
(il-  
Note: Connecting headphones auto-  
matically disconnects the System  
741’s speakers.  
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BASIC OPERATION  
Slide the control up to boost or down  
to reduce the level. The selected fre-  
quency range is not changed if you set  
the control to the center position (0).  
TURNING ON/OFF THE  
SYSTEM  
To turn on the system, simply press  
POWER. The POWER indicator lights.  
(il-  
(il-  
LOW (100 Hz) — Adjusts the frequen-  
cies in the low bass range (low organ  
notes and bass drums). Reduces rum-  
ble or other low-frequency noise.  
To turn off the system, press POWER  
again. The POWER indicator turns off.  
MID (1 kHz) — Adjusts the range of fre-  
quencies where the ear is most sensi-  
tive (vocals).  
ADJUSTING THE  
BALANCE  
To adjust the sound balance between  
the left and right speakers, turn BAL-  
ANCE toward L (left) or R (right).  
HIGH (10 kHz) — Adjusts high frequen-  
cy sounds (cymbals, flutes, and vio-  
lins).  
(il-  
USING E-BASS  
Press E-BASS to the in position for en-  
hanced bass sound. The E-BASS indi-  
cator lights.  
USING THE 3-BAND  
FREQUENCY  
EQUALIZER  
(il-  
You can use the 3-BAND FREQUENCY  
EQUALIZER to customize the sound  
you hear through the speakers. Each  
of the three slide controls lets you ad-  
just the sound level in a specific fre-  
quency range.  
Press E-BASS to the out position for  
normal bass sound.  
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RADIO OPERATION  
1. Press TUNER. The TUNER indica-  
4. Set MONO/STEREO for the desired  
tor lights.  
sound.  
(il-  
(il-  
2. Set BAND to AM or FM.  
Notes:  
• If FM reception is strong, set  
MONO/STEREO to STEREO to  
receive the signal in stereo. The  
FM STEREO indicator lights  
when you receive an FM broad-  
cast in stereo.  
(il-  
3. Adjust TUNING to the desired sta-  
tion.  
(il-  
(il-  
• If FM stereo reception is weak,  
set MONO/STEREO to MONO.  
The sound is monaural, but the  
reception should improve.  
• For the best AM reception, sim-  
ply change the position of the  
system.  
5. Adjust VOLUME, BALANCE, and  
the 3-BAND FREQUENCY EQUAL-  
IZER for the desired sound.  
• For the best FM reception, fully  
uncoil the power cord or con-  
nect an external FM antenna.  
6. Press E-BASS to boost low fre-  
quency sounds for an emphasized  
bass sound.  
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CD PLAYER OPERATION  
LOADING AND PLAYING  
A CD  
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1. Press CD. The CD indicator lights,  
00 appears briefly, then dISC  
appears on the display.  
Caution: Never force the CD  
compartment door to close. You  
might damage the CD player’s  
loading mechanism or the CD.  
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5. Press PLAY/PAUSE to begin play.  
Track number 01and the elapsed  
play time appear on the display.  
The CD player plays all the tracks  
in order.  
2. Press  
OPEN/CLOSE. OPEN  
appears on the display, and the  
CD compartment opens.  
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PLAY/PAUSE to stop  
Note: Press  
the CD temporarily.  
the display. Press PLAY/PAUSE  
3. Carefully place a CD in the com-  
partment with the label facing up.  
appears on  
again to play the CD.  
pears.  
disap-  
6. Adjust VOLUME, BALANCE, and  
the 3-BAND FREQUENCY EQUAL-  
IZER for the desired sound.  
(il-  
7. Press E-BASS to boost low fre-  
quency sounds for an emphasized  
bass sound.  
4. Press OPEN/CLOSE to close the  
CD compartment. The display  
temporarily shows 00, then  
shows the CD’s total number of  
tracks and total playing time.  
8. The CD automatically stops when  
it reaches the end. Press STOP to  
stop playing the CD before it auto-  
matically stops.  
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Audible Search  
SPECIAL CD PLAYER  
FEATURES  
To search forward or backward during  
SKIP/  
SKIP/  
play, press and hold down  
Skip Search  
SEARCH  
or  
SEARCH  
. The CD plays rapidly and  
You can skip forward or backward  
through the tracks on a CD or tracks in  
a programmed sequence to quickly  
find a desired track.  
you hear the music at a higher speed  
but lower volume.  
Release the button to resume normal  
play.  
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Storing/Playing a  
Programmed Sequence  
You can program the CD player to  
play up to 21 tracks in any order you  
choose, and you can program the  
same track to play more than once.  
To skip to the beginning of the  
next track during play, press and  
SKIP/SEARCH  
release  
.
To return to the beginning of the  
current track during play, press  
1. While the CD player is stopped,  
PROGRAM  
press  
.
The display  
SKIP/SEARCH  
and release  
.
shows 00 P: 01(memory loca-  
tion 1).  
To skip forward or backward to  
additional tracks, repeatedly press  
SKIP/SEARCH  
or  
SKIP/SEARCH  
(il-  
until the desired  
track number appears on the dis-  
play.  
Notes:  
• If you press  
SKIP/SEARCH  
SKIP/SEARCH  
2. Press  
or  
SKIP/SEARCH  
to find the  
while the first track is playing, the  
first track replays.  
track you want to program into  
memory location 1.  
SKIP/SEARCH  
• If you press  
while the last track is playing, it  
has no effect.  
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3. Press PROGRAM again to store  
the track in the current memory  
location. The next memory loca-  
tion appears.  
The CD’s total number of tracks and  
playing time appear.  
To play the programmed se-  
Note:  
quence again, press PROGRAM then  
PLAY/PAUSE.  
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Reviewing a Programmed  
Sequence  
To review a programmed sequence,  
while play is stopped, repeatedly  
press PROGRAM. The track number  
and memory position number of each  
stored track appear on the display.  
4. Repeat Steps 2–3 for each track  
you want to program.  
If you program more than  
Note:  
21 tracks, the additional tracks  
replace the currently pro-  
grammed tracks.  
Editing a Programmed  
Sequence  
5. Press PLAY/PAUSE. PGMappears  
on the display and the CD player  
plays the tracks in the order you  
programmed.  
To edit the programmed sequence, re-  
peatedly press PROGRAM until the  
stored track you want to change ap-  
pears on the display.  
Notes:  
• Press PLAY/PAUSE to temporarily  
stop the music. Press PLAY/  
PAUSE again to resume play.  
Press SKIP/SEARCH  
or  
SKIP/SEARCH until the new track ap-  
pears on the display, then press PRO-  
GRAM to store the new track in place  
of the old one.  
• Press SKIP/SEARCH  
SKIP/SEARCH to move  
the programmed  
sequence during play.  
and  
through  
Erasing a Programmed  
Sequence  
Programmed play automatically stops  
at the end of the last programmed  
track.  
To erase a programmed sequence,  
you can press OPEN/CLOSE or POW-  
ER before, during, or after pro-  
grammed play.  
To stop the CD player at any time dur-  
ing programmed play, press STOP.  
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• During random play, you can use  
to advance to the next ran-  
Random Play  
You can set the CD player to play a  
CD’s tracks in random order.  
domly selected track, use  
to  
return to the beginning of the cur-  
rent track, or repeat the current  
track (see “Repeat” below).  
1. Before or during play, press RAN-  
DOM so RNDappears on the dis-  
play.  
To cancel random play and resume  
normal play without stopping, simply  
press RANDOM. RNDdisappears from  
the display and the CD player re-  
sumes normal play.  
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Cue  
To start playing a CD from a desired  
track, before you begin play or during  
2. If necessary, press PLAY/PAUSE  
to begin random play. The CD  
player randomly selects and plays  
all the tracks on the CD once,  
then automatically stops.  
pause,  
SEARCH  
repeatedly  
or  
press  
SKIP/  
SKIP/SEARCH  
until the desired track number appears  
on the display. Then press PLAY/  
PAUSE to play the track.  
RANDOM while  
Note: If you select  
a track is playing, the CD player  
plays the track to the end, then  
randomly selects and plays all the  
tracks on the CD once.  
Repeat  
You can continuously repeat a single  
track, all the tracks on a CD, or an en-  
tire programmed sequence of tracks  
(see “Storing/Playing a Programmed  
Sequence” on Page 12).  
3. To stop the CD player at any time  
during random play, simply press  
STOP.  
Notes:  
• The currently selected track num-  
ber and its elapsed play time  
appear as the CD plays.  
To continuously repeat a single track,  
press REPEAT before or during play.  
appears on the display.  
REP1  
To skip to the next randomly  
selected track, press  
SEARCH  
SKIP/  
(il-  
.
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To continuously repeat all tracks on  
the CD, press REPEAT twice before or  
Time Display  
during play.  
play.  
appears on the dis-  
While a track is playing, the display  
shows the current track’s number and  
the elapsed playing time since the  
track began playing.  
REP  
To continuously repeat an entire pro-  
grammed sequence, first program the  
tracks you want to play, then press  
REPEAT twice before or during play.  
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appears on the display.  
REP  
To cancel repeat play during or after  
play, repeatedly press REPEAT until  
and  
disappear from the  
REP  
REP1  
Press TIME once to display the current  
track’s remaining playing time.  
display. If repeat is cancelled during  
play, the CD player resumes normal  
play.  
: Pressing STOP cancels repeat  
Note  
play.  
(il-  
Press TIME twice to display the CD’s  
total remaining playing time.  
(il-  
Press TIME three times to return to the  
original display.  
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CASSETTE DECK OPERATION  
You can play one side of a cassette  
tape in either TAPE 1 or TAPE 2 and  
you can record tapes in TAPE 2.  
3. Load the cassette with the open  
edge down, the full reel on the left,  
and the side you want to play fac-  
ing you.  
LOADING AND PLAYING  
A CASSETTE TAPE  
(il-  
Notes:  
• We recommend C-30, C-60, and  
C-90 tapes. Avoid using C-120  
tapes because they are thin and  
can easily get tangled in tape  
mechanisms.  
4. Close the cassette compartment  
door until it clicks.  
5. Press PLAY.  
• Before playing or recording any  
cassette tape, take up any slack in  
the tape by turning one of the cas-  
sette’s hubs with a pencil. If you  
do not remove excess slack, the  
tape might become tangled in the  
record/playback mechanism.  
(il-  
PAUSE to tempo-  
rarily stop tape play. To resume  
play, press PAUSE again.  
Note: Press  
1. Press TAPE. The TAPE indicator  
lights.  
6. Adjust VOLUME, BALANCE, and  
the 3-BAND FREQUENCY EQUAL-  
IZER for the desired sound.  
(il-  
7. Press E-BASS to boost low fre-  
quency sounds for an emphasized  
bass sound.  
2. Open either cassette compart-  
8. The cassette stops automatically  
when it reaches the end. Press  
STOP/EJECT to stop tape play  
sooner.  
ment by pressing STOP/EJECT.  
(il-  
Note: When the tape ends, turn it over  
to listen to the other side.  
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The tape player automatically stops  
when the cassette in TAPE 2 reaches  
end.  
Using Fast Forward/Rewind  
Press FAST-F to fast-forward or RE-  
WIND to rewind the cassette. To stop  
fast forward or rewind before the end  
of the tape, simply press STOP/EJECT.  
To stop consecutive play before the  
tape player automatically stops, press  
STOP/EJECT on both decks.  
(il-  
DUBBING AND  
RECORDING  
You can use the System 741 to dub  
(copy) another tape, or record from  
the radio, CD player, or an external  
audio source (see “Recording from an  
External Audio Source” on Page 20).  
Using Consecutive Play  
You can play one side of a cassette in  
TAPE 1, then immediately play one  
side of a cassette in TAPE 2.  
Notes:  
• The VOLUME, E-BASS, BAL-  
ANCE, and 3-BAND FREQUENCY  
EQUALIZER settings do not affect  
your recordings. The system auto-  
matically adjusts those levels.  
1. Load the cassette you want to  
play first into TAPE 1 and the one  
you want to play second into  
TAPE 2.  
To record on a cassette, its erase-  
protection tabs must be in place  
(see “Preventing Accidental Rec-  
ording” on Page 23).  
(il-  
2. Press PLAY on TAPE 1. The cas-  
sette in TAPE 1 plays.  
3. Press PAUSE then PLAY on TAPE  
2. When TAPE 1 reaches the end,  
the cassette in TAPE 2 plays.  
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5. Press PAUSE and RECORD on  
TAPE 2. Both PAUSE and  
RECORD lock down.  
Dubbing a Cassette Tape  
You can dub at the tape’s normal play-  
ing speed or at twice the normal  
speed. If you dub at normal speed,  
you can listen as you record.  
6. Press PLAY on TAPE 1. TAPE 1  
begins playback, PAUSE releases  
on TAPE 2, and dubbing begins.  
1. Press TAPE.  
Notes:  
2. Load the pre-recorded cassette  
you want to record from into TAPE  
1. Be sure the side you want to  
record from is facing you.  
To skip an unwanted section on  
TAPE 1, press PAUSE on TAPE  
2 while the unwanted section  
plays. To resume dubbing,  
press PAUSE again.  
3. Load a blank cassette (or one you  
want to record over) into TAPE 2  
with the side you want to record  
on facing you.  
To monitor the tape you are  
copying, adjust VOLUME.  
Dubbing automatically stops when the  
cassette in TAPE 2 reaches its end.  
4. Set DUBBING to NORMAL or HIGH.  
If the cassette in TAPE 1 continues to  
play, press STOP/EJECT. To stop dub-  
bing before TAPE 2 stops automati-  
cally, press STOP/EJECT on both  
cassette compartments.  
(il-  
• Set DUBBING to NORMAL to  
dub at normal speed. This pro-  
duces the highest quality  
results.  
• Set DUBBING to HIGH to dub at  
approximately twice the normal  
speed. This produces the fast-  
est results, but the quality is  
slightly reduced.  
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1. Press TAPE. The TAPE indicator  
Recording from the Radio or  
CD Player  
lights.  
2. Load the pre-recorded cassette  
you want to record from into TAPE  
1. Be sure the side you want to  
record from is facing you.  
Press TUNER and tune to the desired  
station, or press CD and load the de-  
sired CD.  
3. Load a blank cassette (or one you  
want to record over) into TAPE 2  
with the side you want to record  
on facing you.  
Insert a cassette you want to record  
onto into TAPE 2, then press PAUSE  
and RECORD. When the desired se-  
lection on the radio or CD player  
plays, release PAUSE.  
4. Insert the microphone into the MIC  
jack.  
Note: Sometimes AM broadcasts pro-  
duce a hum or whistling sound that  
you can hear while listening to a re-  
cording from the radio. To eliminate or  
reduce this sound, set BEAT CUT on  
the back of the system to the position  
that gives you the best quality record-  
ing.  
5. Press PAUSE and RECORD on  
TAPE 2.  
6. When you are ready to record,  
press PLAY on TAPE 1.  
You can sing or speak along with  
the cassette playing in TAPE 1.  
Your voice and the music will be  
mixed and recorded on the cas-  
sette in TAPE 2.  
(il-  
Note: To avoid feedback, adjust  
VOLUME.  
Recording stops automatically when  
the cassette in TAPE 2 ends, or you  
can press STOP/EJECT on TAPE 1 or  
TAPE 2 to stop recording at any time.  
Making a Mixed Recording  
You can connect a microphone with a  
1/8-inch plug into the MIC jack so you  
can record on TAPE 2 while you  
speak into the microphone and play a  
pre-recorded tape in TAPE 1. Your lo-  
cal RadioShack store carries a wide  
selection of microphones.  
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13-1288.fm Page 20 Wednesday, July 14, 1999 6:02 PM  
USING AN EXTERNAL AUDIO SOURCE  
If you connected an external audio  
RECORDING FROM AN  
EXTERNAL AUDIO  
SOURCE  
source, such as a TV, VCR, or an ex-  
ternal CD player or cassette deck, you  
can use your System 741 to listen to  
or record audio from that source.  
VOLUME, E-BASS, BAL-  
Note: The  
ANCE, and 3-BAND FREQUENCY  
EQUALIZER settings do not affect your  
recordings. The system automatically  
adjusts those levels.  
LISTENING TO AN  
EXTERNAL AUDIO  
SOURCE  
1. Turn VOLUME to MIN, and make  
sure the external audio source’s  
volume control (if any) is also set  
to its lowest level.  
1. Turn VOLUME to MIN, and make  
sure the external audio source’s  
volume control (if any) is also set  
to its lowest level.  
2. Press AUX. The AUX indicator  
2. Press AUX. The AUX indicator  
lights.  
lights.  
3. Insert a cassette you want to  
record on into TAPE 2.  
4. Press RECORD to begin record-  
(il-  
ing.  
5. Start playback on the external  
audio source.  
Note: To pause the tape during  
recording, press PAUSE. To  
resume recording, press PAUSE  
again.  
3. Start playback on the external  
audio source.  
4. Adjust VOLUME, BALANCE, and  
the 3-BAND FREQUENCY EQUAL-  
IZER for the desired sound.  
6. To stop the tape at any time dur-  
ing recording, press STOP/EJECT.  
5. Press E-BASS to boost low fre-  
quency sounds for an emphasized  
bass sound.  
7. Stop playback on the external  
audio source.  
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CARE AND MAINTENANCE  
Your Optimus System 741 Mini Stereo Component System is an example of supe-  
rior design and craftsmanship. The following suggestions will help you care for the  
system so you can enjoy it for years.  
Keep the system dry. If it gets wet, wipe it dry immediately. Liq-  
uids might contain minerals that can corrode the electronic cir-  
cuits.  
Use and store the system only in normal temperature environ-  
ments. Temperature extremes can shorten the life of electronic  
devices, and distort or melt plastic parts.  
Handle the system gently and carefully. Dropping it can damage  
the circuit boards and can cause the system to work improperly.  
Keep the system away from dust and dirt, which can cause pre-  
mature wear of parts.  
Wipe the system with a damp cloth occasionally to keep it look-  
CLEANER  
ing new. Do not use harsh chemicals, cleaning solvents, or  
strong detergents to clean the system.  
Modifying or tampering with the system’s internal components can cause a mal-  
function and might invalidate its warranty and void your FCC authorization to oper-  
ate it. If your system is not performing as it should, take it to your local RadioShack  
store for assistance.  
21  
 
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CD CARE TIPS  
CD PLAYER CARE TIPS  
Although a CD is very durable, you  
should handle it with care. We recom-  
mend the following precautions.  
To avoid damaging the CD player,  
do not place anything but a CD in  
the CD drawer.  
• Keep the CD in its protective case  
or sleeve when you are not play-  
ing it.  
• Moving the CD player suddenly  
from a cold place to a warmer one  
can cause moisture to form on the  
pickup lens and disrupt operation.  
If this happens, unplug the CD  
player then wait about one hour  
before plugging it back in and  
playing the CD.  
• Keep the CD clean. Your local  
RadioShack store sells suitable  
CD cleaner kits.  
• Keep the CD dry. Even a single  
drop of moisture can act as a lens  
and affect the laser beam’s focus.  
If the CD gets wet, wipe it with a  
soft, dry cloth before playing it.  
• If the System 741 is subjected to a  
sudden shock or jolt during play,  
the CD’s rotation speed might  
suddenly change, and the music  
might be briefly interrupted. This is  
not a malfunction.  
• Do not write on either side of a  
CD, especially the non-label side.  
• Handle the CD by its edge to  
avoid fingerprints and surface  
scratches that can prevent the  
laser from accurately reading the  
CD.  
TAPE TIPS  
Erasing a Cassette Tape  
• Do not store CDs in high-tempera-  
ture, high-humidity locations.  
To erase a previously recorded section  
of a tape, simply record over it. To  
erase the entire cassette tape, let the  
tape record to the end with no source  
playing.  
• Remove any loaded CD from the  
CD player before moving the Sys-  
tem 741 to prevent damaging the  
CD.  
You can quickly erase both sides of a  
cassette tape using a bulk tape eraser  
(such as Cat. No. 44-232, not sup-  
plied), available at your local Ra-  
dioShack store.  
To repair scratches on the CD sur-  
face, use a CD scratch repair kit  
(such as “Scratch ’n Fix,” Cat. No.  
42-127).  
22  
 
13-1288.fm Page 23 Wednesday, July 14, 1999 6:02 PM  
Preventing Accidental  
Recording  
Restoring Tape Tension and  
Sound Quality  
Cassette tapes have two protection  
tabs — one for each side. To protect a  
recording from being accidentally re-  
corded over, use a screwdriver to re-  
move one or both of the cassette’s  
protection tabs.  
After you play a cassette tape several  
times, the tape might become tightly  
wound on the reels. This can cause  
playback sound quality to deteriorate.  
To restore the sound quality, fast-for-  
ward the tape from the beginning to  
the end of one side, then completely  
rewind it. Then loosen the tape reels  
by gently tapping each side of the cas-  
sette’s outer shell on a flat surface.  
(il-  
Caution: Be careful not to damage  
the cassette when tapping it. Do not  
touch the exposed tape or allow any  
sharp objects near the cassette.  
Note: Removing the protection tabs  
does not prevent a bulk eraser from  
erasing a cassette tape.  
Cleaning the Tape-Handling  
Parts  
If you want to record on a tape side af-  
ter you have removed the protection  
tab, place a piece of strong plastic  
tape over that side’s protection hole.  
Dirt, dust or particles of the tape’s  
coating can accumulate on the tape  
deck’s tape heads and other parts that  
the tape touches. This can greatly re-  
duce the performance of the cassette  
player.  
Be sure you cover only the hole origi-  
nally covered by the protection tab.  
(il-  
23  
 
13-1288.fm Page 24 Wednesday, July 14, 1999 6:02 PM  
Use the following cleaning procedure  
after every 20 hours of tape player op-  
eration.  
Your local RadioShack store sells a  
complete line of cassette deck clean-  
ing supplies.  
1. Disconnect power.  
2. Open the cassette compartment  
doors on TAPE 1 and TAPE 2.  
THE FCC WANTS YOU  
TO KNOW  
3. Press PLAY on TAPE 1 and TAPE  
2 to expose the tape-handling  
parts.  
This system complies with limits for a  
Class B digital device as specified in  
Part 15 of FCC Rules. These limits  
provide reasonable protection against  
radio or TV interference in a residen-  
tial area. However, your system 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:  
4. Use a cotton swab dipped in  
denatured alcohol or tape head  
cleaning solution to clean the  
record and play heads, pinch  
roller, capstan, tape guides, and  
erase head.  
• Reorient or relocate the receiving  
antenna  
• Increase the distance between the  
system and the radio or TV  
(il-  
• Use outlets on different electrical  
circuits for the system and the  
radio or TV  
If the problem continues, take your  
system to your local RadioShack store  
for assistance.  
5. When you finish cleaning, press  
STOP/EJECT on TAPE 1 and  
TAPE 2 and close the cassette  
compartment doors, then recon-  
nect power.  
24  
 
13-1288.fm Page 25 Wednesday, July 14, 1999 6:02 PM  
SPECIFICATIONS  
Cassette Player:  
Tape Speed ............................................................................................ 17/8 ips  
Wow and Flutter (WRMS) .......................................................................0.35%  
Frequency Response (at –3 dB) .................................................100 Hz–8 kHz  
Recording System ................................................................................ AC Bias  
Erase System ........................................................................................ Magnet  
CD Player:  
Number of Programmable Tracks ................................................................. 21  
Tracks Frequency Response (at –3 dB) ......................................60 Hz–15 kHz  
Dynamic Range ........................................................................................70 dB  
Signal-to-Noise Ratio (JIS-A) ...................................................................60 dB  
Harmonic Distortion (at 1 kHz) .....................................................................1%  
Separation (at 1 kHz) ...............................................................................40 dB  
Sampling Frequency .........................................................................176.5 kHz  
Quantization Number .................................................................................1-Bit  
Linear/Channel Oversampling .............................................................. 4 Times  
Pick-Up System .....................................................................................3 Beam  
Optical Source ................................................................. Semiconductor Laser  
Wavelength ................................................................................... 760–820 nm  
25  
 
13-1288.fm Page 26 Wednesday, July 14, 1999 6:02 PM  
General:  
Microphone (Monaural) Impedance ...................................................600 ohms  
Headphones (Stereo) Impedance ....................................................16–32 ohm  
Power Output .................................................................4.5 Watts per Channel  
Dimensions (HWD) ....................................................121/8 ¥ 105/8 ¥ 91/4 Inches  
(308 ¥ 270 ¥ 235 mm)  
Weight: (Main Unit) ..................................................................................10 lb  
(4.5 kg)  
(Speakers) ...............................................................................3.15 lb  
(1.4 kg)  
Power Supply .................................................................. 120V AC 60 Hz, 38W  
Tuning Range ..................................................................... AM: 530–1710 kHz  
FM: 88–108 MHz  
Graphic Frequency Equalizer ....................................................100 Hz ±10 dB  
1 kHz ±10 dB  
10 kHz ±10 dB  
Speaker Size ............................................................................ 5-Inch Speaker  
Specifications are typical; individual units might vary. Specifications are subject to  
change and improvement without notice.  
26  
 
13-1288.fm Page 27 Wednesday, July 14, 1999 6:02 PM  
NOTES  
27  
 
13-1288.fm Page 28 Wednesday, July 14, 1999 6:02 PM  
RadioShack Limited Warranty  
This product is warranted against defects for 90 days from date of purchase from  
RadioShack company-owned stores and authorized RadioShack franchisees and deal-  
ers. Within this period, we will repair it without charge for parts and labor. Simply bring  
your RadioShack sales slip as proof of purchase date to any RadioShack store. War-  
ranty does not cover transportation costs. Nor does it cover a product subjected to mis-  
use or accidental damage.  
EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES  
AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE DURATION  
OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. Some states do  
not permit limitation or exclusion of implied warranties; therefore, the aforesaid limita-  
tion(s) or exclusion(s) may not apply to the purchaser.  
This warranty gives you specific legal rights and you may also have other rights which vary from  
state to state.  
We Service What We Sell  
10/95  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
6A6  
Printed in Hong Kong  
 

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