Optimus Home Theater System SYSTEM 728 User Manual

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Cat. No. 13-1275  
OWNER’S MANUAL  
Please read before using this equipment.  
SYSTEM 728  
MINI STEREO COMPONENT SYSTEM  
R
 
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mend you record your system’s  
serial number here.  
General  
Auxiliary Input Jacks æ let you  
connect an external audio input  
source to your system so you can lis-  
ten to or record from it.  
Serial Number:  
Warning: To prevent fire or shock  
hazard, do not expose this system to  
rain or moisture.  
Microphone Mixing ælets you sing  
along with the music you are playing.  
CAUTION  
Important: Most material on com-  
pact discs and prerecorded tapes is  
copyrighted. Unauthorized duplica-  
tion of copyrighted material is a viola-  
tion of the copyright 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 dupli-  
cate musical recordings for noncom-  
mercial (personal) use  
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.  
This symbol is intended to alert  
you to the presence of uninsulat-  
ed dangerous voltage within the  
system’s enclosure that might be  
of sufficient magnitude to consti-  
tute a risk of electric shock. Do not  
open the system’s case.  
Compact discs that you can play on  
your system’s CD player have this  
mark on them.  
This symbol is intended to inform  
you that important operating and  
maintenance instructions are in-  
cluded in the literature accompa-  
nying this system.  
!
Warning: This system uses a laser  
light beam. Only a qualified service  
person should remove the cover or  
attempt to service this device, due to  
possible eye injury.  
Read this manual carefully. It will  
help you get the most enjoyment  
from your system.  
Your system’s serial number is locat-  
ed on the back panel. We recom-  
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FCC INFORMATION  
This system complies with the limits  
for a Class B digital device as speci-  
fied in part 15 of FCC Rules. These  
limits provide reasonable protection  
against TV or radio interference in a  
residential area. However, your sys-  
tem might cause TV or radio interfer-  
ence even when it is operating  
properly.  
To eliminate interference, you can try  
one or more of the following correc-  
tive measures.  
• Reorient or relocate the TV or  
radio’s receiving antenna.  
• Increase the distance between  
the system and the TV or radio.  
• Use outlets on different electrical  
circuits for the system and the  
TV or radio.  
Consult your local Radio Shack store  
if the problem still exists.  
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CONTENTS  
Preparation .......................................................................................................7  
Connecting the Speakers ............................................................................ 7  
Connecting an External Audio Source......................................................... 7  
Connecting an External Antenna.................................................................7  
Installing the Remote Control’s Batteries.....................................................8  
Connecting to Power ................................................................................... 8  
Operation ..........................................................................................................9  
Turning Power On/Off..................................................................................9  
Setting the Clock.......................................................................................... 9  
Basic Operation .........................................................................................10  
Using Headphones .................................................................................... 11  
Listening Safely................................................................................... 11  
Displaying the Time ................................................................................... 12  
Using the Electronic Graphic Equalizer .....................................................12  
Using the Mute Button ...............................................................................12  
Using the Timer..........................................................................................12  
Setting the Timer................................................................................. 12  
Turning the Timer On/Off..................................................................... 14  
Displaying the Timer............................................................................ 14  
Using the Sleep Timer ...............................................................................15  
Using the Remote Control .........................................................................15  
Using the Tuner ..............................................................................................16  
Manual Tuning ...........................................................................................16  
Automatic Seek Tuning..............................................................................17  
Memory Tuning..........................................................................................17  
Storing Stations in Memory .................................................................17  
Manually Tuning to a Preset Station ...................................................18  
Scanning the Preset Stations.............................................................. 18  
Using the CD Changer ................................................................................... 19  
Loading a CD............................................................................................. 19  
Playing a CD..............................................................................................19  
Selecting Another CD ................................................................................20  
Automatic Search ...................................................................................... 20  
Random Play ............................................................................................. 20  
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Repeat Play............................................................................................... 21  
Repeating a Single Track.................................................................... 21  
Repeating All Tracks on a Selected CD.............................................. 21  
Repeating All Tracks on All Loaded CDs ............................................ 21  
Repeating a Programmed Sequence.................................................. 21  
Programmed Play...................................................................................... 22  
Programming and Playing a Sequence of Tracks............................... 22  
Reviewing the Programmed Sequence .............................................. 22  
Replacing/Adding a Track in a Programmed Sequence ..................... 23  
Clearing the Programmed Sequence.................................................. 23  
Using the Cassette Deck ............................................................................... 24  
Loading a Cassette Tape........................................................................... 24  
Playing a Cassette Tape............................................................................ 24  
Using Consecutive Play............................................................................. 25  
Recording .................................................................................................. 25  
Dubbing Cassette Tapes..................................................................... 25  
Copying a CD to a Cassette Tape....................................................... 26  
Recording from the Tuner or an External Audio Source ..................... 27  
Timer Recording.................................................................................. 28  
Microphone Mixing ........................................................................................ 29  
Care and Maintenance................................................................................... 30  
CD Care Tips............................................................................................. 31  
Tape Tips ................................................................................................... 31  
Erasing a Cassette Tape..................................................................... 31  
Preventing Accidental Erasure............................................................ 31  
Restoring Tape Tension and Sound Quality........................................ 32  
Cleaning the Tape Handling Parts ...................................................... 32  
Specifications................................................................................................. 33  
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PREPARATION  
Note: Complete all connections be-  
fore connecting to AC power and  
turning it on.  
CONNECTING AN  
EXTERNAL AUDIO  
SOURCE  
To connect an external audio source  
(such as a CD player or a cassette  
deck) to your system, connect the  
source’s left and right line level out-  
put jacks to the AUX IN R and L jacks  
on the back of your system.  
CONNECTING THE  
SPEAKERS  
CONNECTING AN  
EXTERNAL ANTENNA  
You can attach an FM or VHF anten-  
na (not supplied) to the 300 ohm EXT.  
ANT. terminals on the back of the sys-  
tem.  
1. Press the red speaker terminal  
+
tab labeled SPEAKER R. Ch  
on the back of the system, insert  
the stripped end of the right  
speaker’s striped wire into the  
terminal, then release the tab.  
2. Press the black speaker terminal  
tab labeled SPEAKER R. Ch  
-
on the back of the system, insert  
the stripped end of the right  
speaker’s other wire into the ter-  
minal, then release the tab.  
If you have an outside VHF TV an-  
tenna, you can use a signal splitter  
with a 300-ohm output to connect  
your stereo system and TV set to the  
same antenna. Your local Radio  
Shack store has a wide selection of  
antennas, connectors, and splitters.  
3. Repeat Steps 1 and 2 to connect  
the left speaker to SPEAKER L.  
+
Ch  
and  
terminals.  
-
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3. Replace the cover.  
INSTALLING THE  
REMOTE CONTROL’S  
BATTERIES  
Caution: If you are not going to use  
the remote control for a month or  
more, remove its batteries. Weak  
batteries can leak damaging chemi-  
cals.  
The remote control requires two AA  
batteries (not supplied) for power.  
We recommend alkaline batteries,  
such as Radio Shack Cat. No. 23-  
557.  
Note: If the remote control operates  
erratically or does not work, replace  
both batteries.  
Follow these steps to install batter-  
ies.  
CONNECTING TO  
POWER  
1. Press down and slide the battery  
compartment cover in the direc-  
tion of the arrow.  
After you complete all connections,  
plug the music system’s supplied  
power cord into a standard AC outlet.  
The STAND BY indicator lights, and  
and AM 12:00 appear on  
the display (see “Setting the Clock”).  
CLO  
Warning: To prevent electric shock,  
the AC power cord plug’s blades are  
polarized and fit a polarized AC outlet  
only one way. If you have difficulty in-  
serting the plug, do not force it. Turn  
it over and reinsert it.  
2. Install the batteries as indicated  
by the polarity symbols ( ) and  
+
( ) marked inside the compart-  
ment.  
-
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OPERATION  
TURNING POWER ON/  
OFF  
SETTING THE CLOCK  
1. If necessary, press DISPLAY so  
and the time appear on  
the display.  
CLO  
Warning: To protect your hearing,  
set VOLUME to MIN before you turn  
on the system.  
2. Press MEMORY.  
flashes  
CLO  
on the display.  
Press POWER to turn on the system.  
The STAND BY indicator turns off  
and the indicator above CD, TUNER,  
TAPE, or AUX lights.  
TUN-  
Note: If you do not press  
ING  
or within 10 sec-  
onds after you press MEMORY,  
stops flashing on the dis-  
play. Start again from Step 2.  
CLO  
3. While  
flashes, repeatedly  
press TUNING to set the  
desired hour. If you press and  
CLO  
hold down TUNING  
advances continuously.  
, the hour  
Notes:  
• If the indicator above CD, TAPE,  
Note: AM or PM appears when  
you set an AM or PM hour.  
or AUX appears,  
and the  
CLO  
time appear on the display.  
4. While  
flashes, repeatedly  
press TUNING to set the  
desired minutes. If you press  
and hold down TUNING , the  
CLO  
• If the indicator above TUNER  
appears, the AM or FM station  
previously selected appears on  
the display.  
minutes advance continuously.  
5. Press MEMORY again when you  
finish setting the time, or just  
wait 10 seconds.  
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BALANCE  
4. Adjust  
until you can  
BASIC OPERATION  
hear the sound equally from the  
left and right speakers.  
Follow these steps to operate your  
system.  
CD TUNER, TAPE AUX  
, or  
1. Press  
,
to select the desired audio  
source.  
5. Select the desired equalization  
NORMAL, POP,  
by pressing  
ROCK,  
CLASSIC  
or  
(see “Using  
the Electronic Graphic Equal-  
izer”).  
E-BASS  
6. Press  
to emphasize  
bass sounds. To return to nor-  
E-BASS  
mal bass sounds, press  
again.  
TUNER  
2. If you select  
, select the  
desired station (see “Using the  
Tuner”).  
CD, TAPE  
AUX  
,
If you select  
, or  
start the selected audio source  
(see “Using the CD Changer” or  
“Using the Cassette Deck”).  
7. To turn off the system, press  
POWER  
so the STAND BY indi-  
cator lights.  
VOLUME  
3. Adjust  
to a comfortable  
listening level.  
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Listening Safely  
USING HEADPHONES  
To protect your hearing, follow these  
guidelines when you use head-  
phones.  
You can use headphones (not sup-  
plied) to listen in privacy. Insert the  
headphones’ /8-inch (3.5 mm) plug  
1
PHONES  
into the  
jack.  
• Do not listen at extremely high  
volume levels. Extended high-  
volume listening can lead to per-  
manent hearing loss.  
• Set the volume to the lowest set-  
ting before you begin listening.  
After you begin listening, adjust  
the volume to a comfortable  
level.  
• 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.  
Notes:  
• Your local Radio Shack store  
sells a wide selection of head-  
phones.  
• Connecting headphones auto-  
matically disconnects the speak-  
ers.  
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DISPLAYING THE TIME  
USING THE MUTE  
BUTTON  
To display the clock while you use  
DISPLAY  
the radio, press  
. To return  
DISPLAY  
MUTE  
The  
button lets you temporarily  
MUTE  
to the radio display, press  
again.  
turn off the sound. Press  
to turn it off. Press  
store sound.  
once  
again to re-  
MUTE  
USING THE TIMER  
USING THE  
ELECTRONIC GRAPHIC  
EQUALIZER  
You can set the timer to automatical-  
ly turn on the system, play from the  
tuner or a cassette tape (not from a  
CD), then turn off the system.  
You can select any one of four preset  
sound characteristics using the sys-  
tem’s electronic graphic equalizer.  
Each setting distinctly changes the  
music’s character or tone.  
Note: You can use the system while  
the timer is set.  
Setting the Timer  
Setting  
NORMAL  
Sound  
1. While the current time appears  
Normal sound  
1
on the display, press  
ON  
.
TIM  
flashes on the display.  
POP  
More presence  
of vocals and  
midrange  
:
TUNER  
is selected,  
Note If  
DISPLAY  
press  
first so the cur-  
rent time appears on the display.  
ROCK  
CLASSIC  
Powerful sound  
emphasizing tre-  
ble and bass  
Sound enriched  
with heavy bass  
and fine treble  
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TUN-  
within 10 seconds  
2.  
Note: If you do not press  
ING  
after you press ,  
4. Press  
flashes on  
TIM OFF  
or  
the display.  
1
dis-  
TIM ON  
appears from the display. Start  
again from Step 1.  
2. While  
flashes, repeat-  
TIM ON  
TUNING  
edly press  
to set the  
hour of the desired start time.  
5. While  
peatedly press  
flashes, re-  
TIM OFF  
TUNING  
to  
set the hour of the desired end  
time.  
Notes:  
TUNING  
• Press and hold down  
to continuously advance  
the hour.  
AM or PM appears when you  
Notes:  
set an AM or PM hour.  
TUNING  
to continuously advance  
• Press and hold down  
6. While  
continues to  
TIM OFF  
flash, repeatedly press  
to set the minutes of the  
desired end time.  
TUNING  
the hour.  
AM or PM appears when you  
set an AM or PM hour.  
Note: Press and hold down  
TUNING  
advance the minutes.  
to continuously  
3. While  
flash, repeatedly press  
to set the minutes of the  
desired start time.  
continues to  
TIM ON  
TUNING  
7. When you finish setting the  
DISPLAY  
alarm timer, press  
to  
return to the current time display,  
or wait 10 seconds for the sys-  
tem to automatically return to  
the current time display.  
Note: Press and hold down  
TUNING  
advance the minutes.  
to continuously  
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To turn off the timer, simply press  
TIMER again.  
Turning the Timer On/Off  
1. Press TUNER or TAPE to select  
the desired audio source.  
Notes:  
2. If you selected TUNER, select  
the desired station (see “Using  
the Tuner”) and adjust VOLUME  
to a comfortable listening level.  
• The system’s controls do not  
work when TIMER is pushed to  
on. To operate the system, you  
must turn off the timer.  
If you selected TAPE, insert the  
desired tape, press PLAY, and  
adjust VOLUME to a comfortable  
listening level (see “Using the  
Cassette Deck”).  
• If you played a cassette tape  
with the timer, and the timer  
turns the system off before the  
tape ends, press STOP/EJECT  
as soon as possible to release  
the tape from the mechanism.  
3. Press TIMER to turn on the timer.  
The system turns off.  
Displaying the Timer  
When the selected start time ap-  
pears on the display, the system au-  
tomatically turns on, plays, and turns  
off at the selected end time. The sys-  
tem turns on again the next day at  
the set start time.  
To display the timer’s start time,  
press 1 so  
time appear for 10 seconds. To dis-  
and the start  
TIM ON  
play the timer’s finish time, press 2 so  
and the finish time appear  
for 10 seconds.  
TIM OFF  
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USING THE SLEEP  
TIMER  
USING THE REMOTE  
CONTROL  
You can set the system to play up to  
90 minutes, then automatically turn  
off.  
The remote control’s buttons have  
the same functions as the corre-  
sponding buttons on the main sys-  
tem.  
CD, TUNER, TAPE  
, or  
AUX  
1. Press  
to select the desired audio  
source.  
To use the remote control, point it to-  
ward the remote sensor on the left of  
the system’s AM/FM STEREO RE-  
CEIVER display and press the de-  
sired buttons.  
2. Tune to the desired AM or FM  
radio station, or start the  
selected CD, tape, or your exter-  
nal audio source.  
POWER  
3. Press  
tem.  
to turn off the sys-  
4. To turn on the sleep timer, press  
SLEEP.  
and release  
90appear on the display.  
and  
SLE  
To set the sleep timer to a sleep  
time, press and hold down  
SLEEP  
until the desired sleep  
time appears on the display. The  
displayed sleep time decreases  
in 10-minute steps.  
Notes:  
The system turns itself off after the  
amount of time you selected. To turn  
off the sleep timer sooner, press  
• Make sure you have a clear path  
between the remote control and  
the sensor.  
SLEEP  
again so  
disappears  
SLE  
from the display.  
• Weak batteries or direct sunlight  
on the remote sensor might  
reduce the remote control’s  
operating range.  
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USING THE TUNER  
Press TUNER to use the system’s tu-  
er. The indicator above TUNER lights.  
Notes:  
• The system uses a built-in fer-  
rite antenna for AM reception.  
For the best AM reception,  
rotate the system.  
• For the best FM reception,  
see “Connecting an External  
FM Antenna.”  
2. Use FM MODE/AM BEAT to  
select the desired AM or FM  
band’s mode.  
TUNER, the  
Note: When you select  
system automatically tunes to the  
station that was playing when the  
system was turned off or when it was  
last set to TUNER.  
If you selected FM:  
• Press it in to select stereo.  
The FM STEREO indicator  
lights when you receive an  
FM broadcast in stereo.  
You can tune to AM or FM radio sta-  
tions using manual, seek, or memory  
tuning.  
• Press it out to select monau-  
ral. The sound is no longer in  
stereo, but reception should  
improve.  
MANUAL TUNING  
If you selected AM, press it in or  
out to the position that gives the  
best reception.  
1. Press BAND to select the  
desired AM or FM band. AM or  
FMappears on the display.  
3. Repeatedly press TUNING  
or  
to tune up or down the  
selected band. If you press and  
hold down TUNING  
or  
,
the stereo tunes quickly.  
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2. Using either manual or auto-  
matic seek tuning, select the  
station you want to store, then  
AUTOMATIC SEEK  
TUNING  
MEMORY  
press  
.
BAND  
1. Press  
to select the  
desired AM or FM band. AM or  
FMappears on the display.  
TUNING AUTO  
2. Press  
. The sys-  
tem automatically searches up  
the band and stops when it finds  
the next strong station.  
3. While  
appears on the  
MEM-  
display, follow these guidelines  
to store up to 10 stations in  
memory.  
Note: You must store a station  
within 3 seconds. If  
dis-  
MEM-  
MEMORY TUNING  
appears before you make the  
following entries, simply repeat  
this step.  
You can store up to 10 AM and 10  
FM stations in memory.  
To store stations into memory  
locations 1-5, press a memory  
location button (1-5). The sta-  
Storing Stations in Memory  
tion is stored,  
pears, and the display shows  
the frequency.  
disap-  
MEM-  
Note: You can assign one frequency  
to each memory location. When you  
assign another frequency to the  
same memory location, the new fre-  
quency replaces the first one.  
BAND  
1. Press  
to select the  
desired AM or FM band. AM or  
FMappears on the display.  
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To store stations into memory  
locations 6-10, press +5 then  
a memory location button (1-  
5). The station is stored,  
Scanning the Preset  
Stations  
Press M/SCAN. The system scans  
the preset stations and plays each  
station for 5 seconds.  
disappears, and the  
MEM-  
display shows the frequency.  
This increases the  
Note:  
memory location number by  
5. For example, if you press  
+5, then press memory loca-  
tion button 2, the radio stores  
the frequency you selected  
into memory location 7.  
Repeatedly press M/SCAN to  
Note:  
quickly step through the stored sta-  
tions.  
(illus - show the  
baloon pointing at  
the +5 button  
To stop scanning at a desired station,  
within 5 seconds after the tuner stops  
on that station, press DISPLAY or that  
station’s memory location button.  
4. Repeat Steps 1-3 to program  
stations in the other band.  
Manually Tuning to a Preset  
Station  
Press the desired memory location  
button (1 through 5) to directly select  
a radio station stored in memory. For  
preset stations 6 through 10, press  
+5 then the desired memory location  
button.  
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USING THE CD CHANGER  
LOADING A CD  
PLAYING A CD  
1. Press CD.  
To play a CD, simply press PLAY/  
PAUSE after you load it. The selected  
CD begins to play from Track 1. The  
display shows  
, the current tray  
number, the CD’s current track num-  
ber, the track’s elapsed time, and the  
current track number indicator flash-  
es. The system plays all the loaded  
CDs once.  
Notes:  
2. Press OPEN/CLOSE to open the  
CD compartment.  
• After you load a CD, do not  
press either SKIP.  
or  
before the track number indica-  
tors appear on the display. Oth-  
erwise NO DISC appears on the  
display and you must reset the  
CD player by pressing OPEN/  
CLOSE twice (to open and then  
close the CD compartment.)  
Note: The CD carousel has  
three trays, each labeled with a  
number, but only two trays show  
at a time when you open the CD  
compartment.  
• If a tray does not contain a CD,  
the system skips that tray and  
automatically plays the CD in  
the next tray.  
3. Place a CD in either (or both) of  
the exposed trays, label side up.  
To temporarily stop play, press  
y
PLAY/PAUSE.  
ap-pears, the  
elapsed timer stops counting,  
and the current track number  
indicator flashes on the display.  
To resume play, press PLAY/  
PAUSE again.  
Note: To load a CD in the third  
tray, press CD SKIP. The carou-  
sel rotates, exposing the other  
tray.  
4. After you load the CDs, press  
OPEN/CLOSE to close the CD  
compartment. The system dis-  
plays the current tray number,  
and the total number of tracks  
and total playing time of the CD  
in the tray.  
To stop play, press STOP.  
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SELECTING ANOTHER  
CD  
RANDOM PLAY  
This feature randomly selects and  
plays tracks from all loaded CDs.  
CD SKIP  
To select another CD, press  
before or during play.  
Note: To randomly select tracks from  
only one or two CDs, you must load  
only those CDs in the CD tray.  
If the system is playing a CD, it stops  
playing it and begins playing the first  
track of the selected CD.  
STOP  
1. Press  
to cancel any CD  
function.  
AUTOMATIC SEARCH  
The Automatic Search feature lets  
you quickly locate the beginning of  
any track on a CD, including the track  
currently playing. You can use Auto-  
matic Search when a CD is playing or  
stopped.  
RANDOM  
2. Press  
. RANDOM  
appears on the display.  
If a CD is playing:  
SKIP  
• Press  
once to skip  
back to the beginning of the cur-  
rent track.  
SKIP  
• Repeatedly press  
to  
skip backward to the beginning  
of the desired track.  
SKIP  
• Repeatedly press  
to  
PLAY/PAUSE  
3. Press  
. After one  
skip forward to the beginning of  
the desired track.  
track plays, the system ran-  
domly selects another track and  
plays it and then continues until  
all tracks on all loaded CDs are  
played.  
If the CD is stopped, repeatedly  
SKIP  
SKIP  
until  
the display shows the number of the  
track you want to play, then press  
press  
or  
PLAY/PAUSE  
. The CD player starts  
playing the selected track.  
20  
 
13-1275.fm Page 21 Wednesday, July 14, 1999 3:59 PM  
Notes:  
Repeating All Tracks on a  
Selected CD  
To repeat the current track,  
SKIP  
. To play the  
next random track, press  
SKIP  
press  
To repeat all tracks on a selected  
CD SKIP  
CD, press  
to select the de-  
.
RE-  
sired CD. Then repeatedly press  
To repeat random play, before  
the last track ends, press  
PEAT  
appears.  
until REPEAT ONE DISC  
REPEAT  
until REPEAT ALL  
appears on the display.  
Repeating All Tracks on All  
Loaded CDs  
To stop random play, press  
STOP  
RANDOM  
. RAN-  
then  
DOMdisappears from the dis-  
play.  
To repeat all tracks on all loaded  
REPEAT  
CDs, repeatedly press  
until  
REPEAT ALL DISCappears.  
REPEAT PLAY  
Repeating a Programmed  
Sequence  
You can repeat a single track on a  
selected CD, all tracks on a selected  
CD, all tracks on all loaded CDs, or a  
programmed sequence.  
To repeat a programmed sequence,  
REPEAT  
press  
while the programmed  
sequence is playing. REPEAT ALL  
appears, and the CD player continu-  
ously replays the programmed se-  
quence.  
Note: To cancel repeat play at any  
REPEAT  
time, repeatedly press  
until  
REPEAT disappears from the dis-  
play.  
Repeating a Single Track  
RE-  
To repeat a single track, press  
PEAT  
once while the desired track is  
playing. REPEAT ONE appears on  
the display, and the CD player con-  
tinuously replays the track.  
21  
 
13-1275.fm Page 22 Wednesday, July 14, 1999 3:59 PM  
than 32 tracks, the new track  
replaces the 32nd track.  
PROGRAMMED PLAY  
You can program up to 32 tracks  
from any loaded CDs to play in any  
order you choose.  
PLAY/PAUSE  
7. Press  
. The CD  
player plays the tracks in the  
programmed order. MEMORY,  
the tray number, the current  
track number, and the track’s  
elapsed time appear on the dis-  
play.  
Programming and Playing a  
Sequence of Tracks  
STOP  
1. Press  
to cancel any CD  
Notes:  
• During play, briefly press or  
function.  
PROGRAM  
2. Press  
. The display  
SKIP  
repeatedly press  
or  
shows MEMORY - - -P-01  
(the current position in the pro-  
grammed sequence).  
SKIP  
as required, to select  
a previous or a following pro-  
grammed track.  
• You cannot use random play or  
display the CD’s remaining time  
while a programmed sequence  
is stored.  
CD SKIP  
• Pressing  
has no effect  
while a programmed sequence  
plays.  
CD SKIP  
3. Press  
to select the CD  
containing the tracks you want  
to store.  
Reviewing the Programmed  
Sequence  
SKIP  
SKIP  
or  
4. Press  
to select the CD’s track number  
you want to store.  
While play is stopped, repeatedly  
PROGRAM  
press  
to review the pro-  
PROGRAM  
5. Press  
. The track is  
grammed sequence.  
stored and the display shows  
MEMORY - - - P-02.  
6. Repeat Steps 3–5 to program  
additional tracks.  
Note: FULLappears on the dis-  
play after you store the 32nd  
track. If you try to program more  
22  
 
13-1275.fm Page 23 Wednesday, July 14, 1999 3:59 PM  
Replacing/Adding a Track in  
a Programmed Sequence  
1. While play is stopped, repeat-  
edly press PROGRAM until the  
track position number you want  
to replace or add to appears on  
the display.  
2. Press CD SKIP to select the CD  
containing the new track.  
3. Press  
SKIP or SKIP  
until the desired track appears  
on the display.  
4. Press PROGRAM. The new track  
replaces a previous track or is  
added to the programmed  
sequence.  
Clearing the Programmed  
Sequence  
To clear the entire programmed se-  
quence, press STOP while play is  
stopped, or press OPEN/CLOSE.  
23  
 
13-1275.fm Page 24 Wednesday, July 14, 1999 3:59 PM  
USING THE CASSETTE DECK  
The system has two cassette decks.  
You can use Deck 1 for normal play-  
back, consecutive play, and dubbing  
(recording). You can use Deck 2 for  
normal playback and consecutive  
play.  
3. Load the cassette by placing it in  
the tape guides in the cassette  
compartment door, with its open  
edge down, the desired side fac-  
ing out, and its full reel to the  
left.  
4. Gently close the compartment  
door.  
Both decks (1 and 2) have a full-re-  
lease auto-stop system to protect  
tapes and prevent pinch roller dam-  
age. When a tape reaches the end  
while playing, recording, fast-for-  
warding, or rewinding, the tape  
mechanism automatically stops.  
PLAYING A CASSETTE  
TAPE  
Warning: To protect your hearing,  
set VOLUME to its lowest setting be-  
fore you begin playing a cassette  
tape.  
LOADING A CASSETTE  
TAPE  
Notes:  
• Use the control buttons under  
the same deck where you  
loaded the tape.  
• Before loading a cassette tape,  
take up any slack in the tape by  
turning one of the cassette’s  
hubs with a pencil. If you do not  
remove excess slack, the tape  
might become tangled in the  
record/playback mechanism.  
Follow these steps to play a cassette  
tape in either Deck 1 or Deck 2.  
1. Load the cassette.  
Follow these steps to load a cassette  
tape in either Deck 1 or Deck 2.  
2. Press PLAY on the deck you are  
using. The tape plays until it  
reaches the end of the side, then  
it automatically stops.  
1. Press TAPE. The TAPE indicator  
lights.  
3. Adjust VOLUME to the desired  
2. Press STOP/EJECT on either  
Deck 1 or Deck 2 to open the  
cassette compartment door.  
listening level.  
24  
 
13-1275.fm Page 25 Wednesday, July 14, 1999 3:59 PM  
4. To fast-forward or rewind the  
tape, press STOP/EJECT then  
press FAST-F or REWIND on the  
deck you are using.  
RECORDING  
Notes:  
• Be sure the erase-protection tab  
for the cassette you want to  
record on is in place (see “Pre-  
venting Accidental Erasure”).  
To temporarily stop playback,  
press PAUSE on the deck you  
are using. Press PAUSE again to  
continue playback.  
• The recording level is preset.  
Adjusting E-BASS, the graphic  
equalizer, or VOLUME does not  
affect the recording level or qual-  
ity.  
To stop playback, fast-forward,  
or rewind, press STOP/EJECT on  
the deck you are using.  
5. To open the cassette compart-  
ment and remove the cassette  
tape, press STOP/EJECT while  
the cassette player is stopped.  
Dubbing Cassette Tapes  
You can easily copy a tape by play-  
ing it in Deck 2 and recording it onto  
another tape in Deck 1. You can se-  
lect between normal and high-speed  
dubbing, and you can monitor the  
tape as you dub it.  
USING CONSECUTIVE  
PLAY  
You can set the tape player to play  
one side of a tape in Deck 2, then au-  
tomatically play one side of a tape in  
Deck 1.  
1. Load the cassette you want to  
copy from into Deck 2 and a  
blank cassette, or one you want  
to record over, into Deck 1.  
1. Load the cassette you want to  
hear first in Deck 2 and the sec-  
ond cassette in Deck 1.  
2. Press PLAY on Deck 2. The cas-  
sette in Deck 2 plays.  
3. While the cassette in Deck 2 is  
playing, press PAUSE then PLAY  
on Deck 1.  
When the cassette in Deck 2 finishes  
playing, the cassette in Deck 1 auto-  
matically begins playback.  
25  
 
13-1275.fm Page 26 Wednesday, July 14, 1999 3:59 PM  
2. To record at normal speed for  
the best quality sound, set HIGH  
SPEED DUBBING to OFF.  
When the tape in either deck reaches  
the end, that deck automatically  
turns off. If the cassette in the other  
deck has not run out of tape, that  
tape continues to record or play. If  
you were using high-speed dubbing,  
the continuing tape plays/records at  
normal speed (instead of high  
speed).  
Copying a CD to a Cassette  
Tape  
To record in half the normal  
recording time, set HIGH SPEED  
DUBBING to ON.  
Follow these steps to copy the tracks  
from the loaded CDs to a cassette  
tape in Deck 1.  
3. On Deck 1, press PAUSE then  
RECORD. PLAY on Deck 1 auto-  
matically locks down.  
1. On Deck 1:  
• Load a blank cassette tape, or  
one you want to record over.  
Do not force down  
RECORD. This can damage the  
Caution:  
• Press PLAY and let the tape  
play for about 5 seconds so it  
plays past the tape leader.  
recording mechanism.  
4. On Deck 2, press PLAY. PAUSE  
on Deck 1 releases and the sys-  
tem copies the tape in Deck 2  
onto the tape in Deck 1.  
• Press STOP/EJECT to stop the  
tape.  
• Press PAUSE then RECORD.  
Notes:  
Do not force down  
RECORD. This can damage the  
recording mechanism.  
Caution:  
To monitor the tape while it is  
copying, adjust VOLUME to a  
comfortable listening level.  
2. Press CD to select the CD  
• If you monitor the tape while  
player.  
high-speed  
dubbing,  
the  
sound is distorted.  
3. Press OPEN/CLOSE to open the  
CD compartment, then load the  
desired CDs in the CD player.  
5. To stop copying, press STOP/  
EJECT on Deck 1 and Deck 2.  
26  
 
13-1275.fm Page 27 Wednesday, July 14, 1999 3:59 PM  
Notes:  
Recording from the Tuner or  
an External Audio Source  
To copy  
a
programmed  
sequence, store the desired  
sequence before continuing  
with Step 4.  
Follow these steps to record from the  
tuner or from an external audio  
source connected to the system,  
such as a VCR or other audio/video  
equipment.  
To copy a CD’s tracks in ran-  
RAN-  
dom sequence, press  
DOM  
so RANDOM appears on  
1. On Deck 1:  
the display before continuing  
with Step 4.  
• Load a blank cassette tape, or  
one you want to record over.  
PAUSE  
4. Simultaneously press  
on  
PLAY/PAUSE  
Deck 1 and  
on the  
PLAY  
• Press  
and let the tape  
CD player. The system records  
from the CD onto the cassette  
tape.  
play for about 5 seconds so it  
plays past the tape leader.  
STOP/EJECT  
• Press  
tape.  
to stop the  
5. To stop recording before it auto-  
STOP  
matically stops, press  
on  
PAUSE  
RECORD  
.
• Press  
then  
STOP/  
the CD player, then press  
EJECT  
on Deck 1.  
Caution: Do not force down  
RECORD  
. This can damage the  
recording mechanism.  
TUNER AUX  
to select  
2. Press  
or  
the desired audio source.  
3. Select the desired station or  
start the selected audio source,  
PAUSE  
then press  
on Deck 1.  
The cassette records until it  
reaches the end of the side, then  
it automatically stops.  
4. To stop recording before it auto-  
STOP/  
matically stops, press  
EJECT  
on Deck 1.  
27  
 
13-1275.fm Page 28 Wednesday, July 14, 1999 3:59 PM  
Caution: If the cassette’s length is  
longer than the timer recording peri-  
od, RECORD and PLAY stay locked  
down when the timer turns off. To  
prevent accidental tape tangling,  
press STOP/EJECT on Deck 1 as  
soon as possible after the timer turns  
off.  
Timer Recording  
You can set the system to automati-  
cally turn itself on, record from a se-  
lected audio source (such as the  
tuner or a cassette tape in Deck 2)  
onto a cassette tape in Deck 1, then  
turn itself off at the time you set.  
1. Repeat Steps 1-7 in “Using the  
Timer,” to set the start and end  
times and select the source you  
want to record from.  
To turn off the timer, press TIMER un-  
til  
disappears from the  
TIM O
N
O
FF  
display. If the tape length is longer  
than the timer setting, press STOP/  
EJECT on Deck 1.  
2. On Deck 1:  
• Load a blank cassette tape, or  
one you want to record over.  
• Press PLAY and let the tape  
play for about 5 seconds so it  
plays past the tape leader.  
• Press STOP/EJECT to stop the  
tape.  
• Press PAUSE then RECORD.  
Caution: Do not force down  
RECORD. This can damage the  
record mechanism.  
3. Press TIMER to turn on the timer.  
4. Press PAUSE on Deck 1. At the  
preset time, the system turns  
itself on and records onto the  
cassette in Deck 1 until the end  
time is reached.  
28  
 
13-1275.fm Page 29 Wednesday, July 14, 1999 3:59 PM  
MICROPHONE MIXING  
Using an external microphone with a  
1/8-inch plug (not supplied), you can  
sing along with selections on CDs or  
cassette tapes, or with a song played  
over the radio.  
3. Select the desired station or  
start the selected audio source.  
4. Adjust VOLUME to a comfortable  
listening level.  
Note: The microphone input  
jack does not have an individual  
volume control.  
Warning: To prevent damage to  
your hearing, set VOLUME to its min-  
imum level before you turn on the  
system.  
5. Sing or talk into the microphone.  
The system mixes your voice  
with the selected audio source.  
Note: Your local Radio Shack sells a  
wide selection of microphones.  
To record your voice and the audio  
source mixed together onto a cas-  
sette tape, follow the steps in “Copy-  
ing a CD to a Cassette Tape” or  
“Recording from the Tuner or an Ex-  
ternal Audio Source.”  
1. Connect an external microphone  
to the MIC MIX jack.  
When you finish mixing, remove the  
microphone’s plug from the MIC MIX  
jack.  
2. Press CD, TUNER, TAPE, or AUX  
to select the desired audio  
source.  
29  
 
13-1275.fm Page 30 Wednesday, July 14, 1999 3:59 PM  
CARE AND MAINTENANCE  
Your Optimus System 728 Mini Stereo Compnent System is an example of su-  
perior 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. Liquids  
might contain minerals that can corrode the electronic circuits.  
Handle the system gently and carefully. Dropping it can damage  
circuit boards and cases and can cause the system to work im-  
properly.  
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.  
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 looking  
CLEANER  
new. Do not use harsh chemicals, cleaning solvents, or strong de-  
tergents to clean the system.  
Modifying or tampering with the system’s internal components can cause a mal-  
function and might invalidate your system’s warranty and void your FCC autho-  
rization to operate it. If your system is not performing as it should, take it to your  
local Radio Shack store for assistance.  
30  
 
13-1275.fm Page 31 Wednesday, July 14, 1999 3:59 PM  
You can quickly erase both sides of a  
cassette tape using a bulk tape eras-  
er (such as Cat. No. 44-232, not sup-  
plied), available at your local Radio  
Shack store.  
CD CARE TIPS  
Even though a compact disc is very  
durable, treat the CD surface with  
care. We recommend the following  
precautions:  
• Do not write on either side of the  
CD, particularly the non-label  
side (signals are read from the  
non-label side).  
Preventing Accidental  
Erasure  
Cassette tapes have two erase-pro-  
tection tabs  
one for each side. To  
æ
• Do not store CDs in high tem-  
perature, high-humidity loca-  
tions. They might warp.  
protect a recording from being acci-  
dentally recorded over or erased,  
use a screwdriver to remove one or  
both of the cassette tape’s erase-  
protection tabs.  
• Keep CDs dry. A water drop can  
act as a lens and affect the laser  
beam’s focus.  
• Always handle a CD by the  
edges to avoid fingerprints and  
always keep it in its protective  
case or sleeve when it is not in  
use. Fingerprints and scratches  
on the CD’s surface can prevent  
the laser beam from correctly  
reading the digital information. If  
the CD gets scratched, use  
Scratch n’ Fix (Radio Shack Cat.  
No. 42-127).  
(Needs an illus - show  
an erase protection tab  
beig removed with a  
screwdriver.  
If you want to record on a tape side  
after you have removed the erase-  
protection tab, place a piece of  
strong plastic tape over that side’s  
erase-protection hole. Be sure you  
cover only the hole originally covered  
by the erase-protection tab.  
TAPE TIPS  
Erasing a Cassette Tape  
Note: Removing the erase-protec-  
tion tabs does not prevent a bulk  
eraser from erasing a cassette tape.  
To erase a previously recorded sec-  
tion of a tape, simply record over it.  
To erase the entire cassette tape, let  
the tape record to the end with no  
source palying.  
31  
 
13-1275.fm Page 32 Wednesday, July 14, 1999 3:59 PM  
1. Disconnect power.  
Restoring Tape Tension and  
Sound Quality  
2. Open the cassette compartment  
doors.  
After you play a cassette tape sever-  
al times, the tape might become  
tightly wound on the reels. This can  
cause playback sound quality to de-  
teriorate.  
3. Press PLAY on both decks to  
expose the tape-handling parts.  
4. Use a cotton swab dipped in  
denatured alcohol or tape head  
cleaning solution to clean the  
record/play head, pinch roller,  
capstan, and erase head.  
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  
cassette’s outer shell on a flat sur-  
face.  
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.  
Cleaning the Tape Handling  
Parts  
Dirt, dust or particles of the tape’s  
coating can accumulate on the tape  
heads and other parts that the tape  
touches. This can greatly reduce the  
performance of the cassette player.  
Use the following cleaning procedure  
after every 20 hours of tape player  
operation. Your local Radio Shack  
store sells a wide selection of cas-  
sette cleaning supplies.  
5. When you finish cleaning, press  
STOP/EJECT on both decks and  
close the cassette compartment  
doors.  
32  
 
13-1275.fm Page 33 Wednesday, July 14, 1999 3:59 PM  
SPECIFICATIONS  
Cassette  
Tape Speed .......................................................................................4.75 cm/sec  
Wow and Flutter ............................................................................ 0.35% WRMS  
Frequency Response .........................................................125 Hz–8 kHz ± 4 dB  
Recording System...................................................................................AC Bias  
Erase System ....................................................................................... Magnetic  
CD Player  
Number of Tracks to be Programmed.................................................. 32 Tracks  
Frequency Response .........................................................40 Hz–16 kHz ± 3 dB  
Dynamic Range...........................................................................................85 dB  
Signal-to-Noise............................................................................... (JIS-A) 75 dB  
Harmonic Distortion (at 1 kHz) .....................................................................0.5%  
Separation (at 1 kHz) ..................................................................................50 dB  
Sampling Frequency ..............................................................................44.1 kHz  
Quantization Number ..................................................................................16 Bit  
Oversampling .......................................................................................... 2 Times  
Pick-Up System.............................................................................Sanyo SF-91P  
Optical Source...............................................................................Sanyo SF-901  
Wavelength ............................................................................................. 790 nm  
33  
 
13-1275.fm Page 34 Wednesday, July 14, 1999 3:59 PM  
General  
Speaker Impedance.................................................................................8 Ohms  
Power Output.....................................................................10 Watts per Channel  
Dimensions of Unit......................................143/16 × 117/16 × 145/16 Inches (HWD)  
(360 × 288 × 338 mm)  
Dimensions of Each Speaker....................... 143/16 × 713/16 × 611/16 Inches (HWD)  
(360 × 200 × 175 mm)  
Weight...................................................................................27 lbs 5 oz (12.4 kg  
Power Supply................................................................... 120V AC, 60 Hz, 48 W  
Tuning Range.........................................................................AM: 530–1710 kHz  
FM: 88–108 MHz  
Speaker Size...........................................................................................5 Inches  
Specifications are typical; individual units might vary. Specifications are subject  
to change and improvement without notice.  
34  
 
13-1275.fm Page 35 Wednesday, July 14, 1999 3:59 PM  
NOTES  
35  
 
13-1275.fm Page 36 Wednesday, July 14, 1999 3:59 PM  
RADIO SHACK LIMITED WARRANTY  
This product is warranted against defects for 90 days from date of pur-  
chase from Radio Shack company-owned stores and authorized Radio  
Shack franchisees and dealers. Within this period, we will repair it with-  
bring your Radio Shack sales  
out charge for parts and labor. Simply  
slip  
as proof of purchase date to any Radio Shack store. Warranty does  
not cover transportation costs. Nor does it cover a product subjected to  
misuse or accidental damage.  
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO  
EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES ARE LIM-  
ITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED  
WARRANTIES CONTAINED HEREIN. Some states do not permit limita-  
tion 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  
9/94  
RADIO SHACK  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
7A5  
Printed in Hong Kong  
 

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