Optimus System 728 Users Manual 13 1275

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Cat. No. 13-1275

OWNER’S MANUAL

MINI STEREO COMPONENT SYSTEM

Please read before using this equipment.

SYSTEM 728

13-1275.fm Page 1 Wednesday, July 14, 1999 3:59 PM

FEATURES

Optimus and Radio Shack are registered trademarks used by Tandy Corporation.

Your Optimus System 728 Mini Ste-

reo Compnent System is a versatile

and high quality sound system. Its

components include a 3-disc carou-

sel CD changer with 32-track memo-

ry, AM/FM stereo tuner with 20-

station presets, and dual cassette

players with high-speed dubbing.

You can operate many of the sys-

tem’s functions with its remote con-

trol. The supplied speakers which

include 5-inch woofers and tweeters,

let you immediately begin using your

system.

Its features include:

AM/FM Stereo Tuner

Selectable Electronic Graphic

Equalizer æ lets you select any of

the preset sound characteristic

curves (normal, pop, rock, and clas-

sic).

Preset Tunin

Memories æ let you

store up to 20 of your favorite sta-

tions for quick tuning.

Extended Bass æ lets you empha-

size low-bass sound.

CD Changer

Automatic CD Chan

er æ lets you

load and play up to three CDs.

Automatic Search æ lets you quick-

ly select any track on the loaded

CDs.

Repeat Pla

æ repeats a single

track, all tracks on a single CD, all

CDs in the CD compartment, or a

programmed sequence.

Random Pla

æ plays all the loaded

CD’s tracks in random order.

Sequence Track Pro

rammin

lets you program up to 32 tracks to

play in any order you choose.

5- or 3-Inch CD Compatible æ lets

you play 5- or 3-inch CDs.

Dual Cassette Player

Normal or Hi

h-Speed Dubbin

lets you dub tapes at normal or twice

normal speed.

Consecutive Pla

æ automatically

plays one side of two tapes in se-

quence.

Auto-Stop æ

automatically stops

the tape when it finishes playing or

recording and when it fast-forwards

or rewinds to the end of the side. This

protects the tape and tape-handling

parts.

13-1275.fm Page 2 Wednesday, July 14, 1999 3:59 PM

General

Auxiliar

Input Jacks æ let you

connect an external audio input

source to your system so you can lis-

ten to or record from it.

Microphone Mixin

æ lets you sing

along with the music you are playing.

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.

an audio recording device to dupli-

cate musical recordings for noncom-

mercial (personal) use

Compact discs that you can play on

your system’s CD player have this

mark on them.

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-

mend you record your system’s

serial number here.

Serial Number:

Warnin

: To prevent fire or shock

hazard, do not expose this system to

rain or moisture.

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.

This symbol is intended to inform

you that important operating and

maintenance instructions are in-

cluded in the literature accompa-

nying this system.

Warnin

: 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.

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.

CAUTION

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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.

13-1275.fm Page 4 Wednesday, July 14, 1999 3:59 PM

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

Usin

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

Usin

the CD Chan

er...................................................................................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

13-1275.fm Page 6 Wednesday, July 14, 1999 3:59 PM

PREPARATION

Note: Complete all connections be-

fore connecting to AC power and

turning it on.

CONNECTING THE

SPEAKERS

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.

3. Repeat Steps 1 and 2 to connect

the left speaker to SPEAKER L.

and

terminals.

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 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.

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.

13-1275.fm Page 7 Wednesday, July 14, 1999 3:59 PM

INSTALLING THE

REMOTE CONTROL’S

BATTERIES

The remote control requires two AA

batteries (not supplied) for power.

We recommend alkaline batteries,

such as Radio Shack Cat. No. 23-

557.

Follow these steps to install batter-

ies.

1. Press down and slide the battery

compartment cover in the direc-

tion of the arrow.

2. Install the batteries as indicated

by the polarity symbols (+) and

(-) marked inside the compart-

ment.

3. Replace the cover.

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.

Note: If the remote control operates

erratically or does not work, replace

both batteries.

CONNECTING TO

POWER

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”).

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.

CLO

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OPERATION

TURNING POWER ON/

OFF

Warnin

: To protect your hearing,

set

VOLUME to MIN before you turn

on the system.

Press POWER to turn on the system.

The STAND BY indicator turns off

and the indicator above CD, TUNER,

TAPE, or AUX lights.

Notes:

• If the indicator above CD, TAPE,

or AUX appears, and the

time appear on the display.

• If the indicator above TUNER

appears, the AM or FM station

previously selected appears on

the display.

SETTING THE CLOCK

1. If necessary, press DISPLAY so

and the time appear on

the display.

2. Press MEMORY. flashes

on the display.

Note: If you do not press TUN-

ING or within 10 sec-

onds after you press MEMORY

stops flashing on the dis-

play. Start again from Step 2.

3. While flashes, repeatedly

press TUNING to set the

desired hour. If you press and

hold down TUNING , the hour

advances continuously.

Note: AM or PM appears when

you set an AM or PM hour.

4. While flashes, repeatedly

press TUNING to set the

desired minutes. If you press

and hold down TUNING , the

minutes advance continuously.

5. Press MEMORY again when you

finish setting the time, or just

wait 10 seconds.

CLO

〈

〉

CLO

〈

CLO

〉

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BASIC OPERATION

Follow these steps to operate your

system.

1. Press CD,

TUNER, TAPE, or AUX

to select the desired audio

source.

2. If you select TUNER, select the

desired station (see “Using the

Tuner”).

If you select CD, TAPE, or AUX,

start the selected audio source

(see “Using the CD Changer” or

“Using the Cassette Deck”).

3. Adjust VOLUME to a comfortable

listening level.

4. Adjust BALANCE until you can

hear the sound equally from the

left and right speakers.

5. Select the desired equalization

by pressing NORMAL, POP,

ROCK, or CLASSIC (see “Using

the Electronic Graphic Equal-

izer”).

6. Press E-BASS to emphasize

bass sounds. To return to nor-

mal bass sounds, press E-BASS

again.

7. To turn off the system, press

POWER so the STAND BY indi-

cator lights.

13-1275.fm Page 10 Wednesday, July 14, 1999 3:59 PM

USING HEADPHONES

You can use headphones (not sup-

plied) to listen in privacy. Insert the

headphones’ 1/8-inch (3.5 mm) plug

into the PHONES jack.

Notes:

• Your local Radio Shack store

sells a wide selection of head-

phones.

• Connecting headphones auto-

matically disconnects the speak-

ers.

Listening Safely

To protect your hearing, follow these

guidelines when you use head-

phones.

• 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.

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DISPLAYING THE TIME

To display the clock while you use

the radio, press DISPLAY. To return

to the radio display, press DISPLAY

again.

USING THE

ELECTRONIC GRAPHIC

EQUALIZER

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.

USING THE MUTE

BUTTON

The MUTE button lets you temporarily

turn off the sound. Press MUTE once

to turn it off. Press MUTE again to re-

store sound.

USING THE TIMER

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.

Note: You can use the system while

the timer is set.

Setting the Timer

1. While the current time appears

on the display, press 1.

flashes on the display.

Note: If TUNER is selected,

press

DISPLAY first so the cur-

rent time appears on the display.

Setting Sound

NORMAL Normal sound

POP More presence

of vocals and

midran

ROCK Powerful sound

emphasizin

tre-

ble and bass

CLASSIC Sound enriched

with heavy bass

and fine treble

TIM

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Note: If you do not press TUN-

ING or within 10 seconds

after you press 1, dis-

appears from the display. Start

again from Step 1.

2. While flashes, repeat-

edly press TUNING to set the

hour of the desired start time.

Notes:

• Press and hold down TUNING

to continuously advance

the hour.

•AM or PM appears when you

set an AM or PM hour.

3. While continues to

flash, repeatedly press TUNING

to set the minutes of the

desired start time.

Note: Press and hold down

TUNING to continuously

advance the minutes.

4. Press 2. flashes on

the display.

5. While flashes, re-

peatedly press TUNING to

set the hour of the desired end

time.

Notes:

• Press and hold down TUNING

to continuously advance

the hour.

•AM or PM appears when you

set an AM or PM hour.

6. While continues to

flash, repeatedly press TUNING

to set the minutes of the

desired end time.

Note: Press and hold down

TUNING to continuously

advance the minutes.

7. When you finish setting the

alarm timer, press DISPLAY to

return to the current time display,

or wait 10 seconds for the sys-

tem to automatically return to

the current time display.

〉

〈

TIM

〈

TIM

〉

TIM

〈

TIM

〉

13-1275.fm Page 13 Wednesday, July 14, 1999 3:59 PM

Turning the Timer On/Off

1. Press TUNER or TAPE to select

the desired audio source.

2. If you selected TUNER, select

the desired station (see “Using

the Tuner”) and adjust VOLUME

to a comfortable listening level.

If you selected TAPE, insert the

desired tape, press PLAY

, and

adjust

VOLUME to a comfortable

listening level (see “Using the

Cassette Deck”).

3. Press TIMER to turn on the timer.

The system turns off.

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 turn off the timer, simply press

TIMER again.

Notes:

• 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 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.

Displaying the Timer

To display the timer’s start time,

press

1 so

and the start

time appear for 10 seconds. To dis-

play the timer’s finish time, press 2 so

and the finish time appear

for 10 seconds.

TIM

13-1275.fm Page 14 Wednesday, July 14, 1999 3:59 PM

USING THE SLEEP

TIMER

You can set the system to play up to

90 minutes, then automatically turn

off.

1. Press CD, TUNER, TAPE, or AUX

to select the desired audio

source.

2. Tune to the desired AM or FM

radio station, or start the

selected CD, tape, or your exter-

nal audio source.

3. Press POWER to turn off the sys-

tem.

4. To turn on the sleep timer, press

and release SLEEP. and

90 appear on the display.

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.

The system turns itself off after the

amount of time you selected. To turn

off the sleep timer sooner, press

SLEEP again so disappears

from the display.

USING THE REMOTE

CONTROL

The remote control’s buttons have

the same functions as the corre-

sponding buttons on the main sys-

tem.

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.

Notes:

• Make sure you have a clear path

between the remote control and

the sensor.

• Weak batteries or direct sunlight

on the remote sensor might

reduce the remote control’s

operating range.

13-1275.fm Page 15 Wednesday, July 14, 1999 3:59 PM

USING THE TUNER

Press TUNER to use the system’s tu-

er. The indicator above TUNER lights.

Note: When you select TUNER, the

system automatically tunes to the

station that was playing when the

system was turned off or when it was

last set to TUNER.

You can tune to AM or FM radio sta-

tions using manual, seek, or memory

tuning.

MANUAL TUNING

1. Press BAND to select the

desired AM or FM band. AM or

FM appears on the display.

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.

If you selected FM:

• Press it in to select stereo.

The FM STEREO indicator

lights when you receive an

FM broadcast in stereo.

• Press it out to select monau-

ral. The sound is no longer in

stereo, but reception should

improve.

If you selected AM, press it in or

out to the position that gives the

best reception.

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.

〉

〈

〉

〈

13-1275.fm Page 16 Wednesday, July 14, 1999 3:59 PM

AUTOMATIC SEEK

TUNING

1. Press BAND to select the

desired AM or FM band. AM or

FM appears on the display.

2. Press TUNING AUTO. The sys-

tem automatically searches up

the band and stops when it finds

the next strong station.

MEMORY TUNING

You can store up to 10 AM and 10

FM stations in memory.

Storing Stations in Memory

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.

1. Press BAND to select the

desired AM or FM band. AM or

FM appears on the display.

2. Using either manual or auto-

matic seek tuning, select the

station you want to store, then

press

MEMORY.

3. While appears on the

display, follow these guidelines

to store up to 10 stations in

memory.

Note: You must store a station

within 3 seconds. If dis-

appears before you make the

following entries, simply repeat

this step.

• To store stations into memory

locations 1-5, press a memory

location button (1-5). The sta-

tion is stored, disap-

pears, and the display shows

the frequency.

MEM-

13-1275.fm Page 17 Wednesday, July 14, 1999 3:59 PM

• To store stations into memory

locations 6-10, press +5 then

a memory location button (1-

5). The station is stored,

disappears, and the

display shows the frequency.

Note: This increases the

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.

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.

Scanning the Preset

Stations

Press M/SCAN. The system scans

the preset stations and plays each

station for 5 seconds.

Note: Repeatedly press M/SCAN to

quickly step through the stored sta-

tions.

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.

MEM-

(illus - show the

baloon pointing at

the +5 button

13-1275.fm Page 18 Wednesday, July 14, 1999 3:59 PM

USING THE CD CHANGER

LOADING A CD

1. Press CD.

2. Press OPEN/CLOSE to open 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.

3. Place a CD in either (or both) of

the exposed trays, label side up.

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.

PLAYING A 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:

• 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.)

• If a tray does not contain a CD,

the system skips that tray and

automatically plays the CD in

the next tray.

• To temporarily stop play, press

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.

To stop play, press STOP.

∇

13-1275.fm Page 19 Wednesday, July 14, 1999 3:59 PM

SELECTING ANOTHER

To select another CD, press CD SKIP

before or during play.

If the system is playing a CD, it stops

playing it and begins playing the first

track of the selected CD.

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.

If a CD is playing:

•Press SKIP once to skip

back to the beginning of the cur-

rent track.

• Repeatedly press SKIP to

skip backward to the beginning

of the desired track.

• Repeatedly press SKIP to

skip forward to the beginning of

the desired track.

If the CD is stopped, repeatedly

press

SKIP or

SKIP until

the display shows the number of the

track you want to play, then press

PLAY/PAUSE. The CD player starts

playing the selected track.

RANDOM PLAY

This feature randomly selects and

plays tracks from all loaded CDs.

Note: To randomly select tracks from

only one or two CDs, you must load

only those CDs in the CD tray.

1. Press STOP to cancel any CD

function.

2. Press RANDOM. RANDOM

appears on the display.

3. Press PLAY/PAUSE. After one

track plays, the system ran-

domly selects another track and

plays it and then continues until

all tracks on all loaded CDs are

played.

∇

13-1275.fm Page 20 Wednesday, July 14, 1999 3:59 PM

Notes:

• To repeat the current track,

press

SKIP. To play the

next random track, press

SKIP .

• To repeat random play, before

the last track ends, press

REPEAT until REPEAT ALL

appears on the display.

• To stop random play, press

STOP then RANDOM. RAN-

DOM disappears from the dis-

play.

REPEAT PLAY

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.

Note: To cancel repeat play at any

time, repeatedly press REPEAT until

REPEAT disappears from the dis-

play.

Repeating a Single Track

To repeat a single track, press RE-

PEAT once while the desired track is

playing. REPEAT ONE appears on

the display, and the CD player con-

tinuously replays the track.

Repeating All Tracks on a

Selected CD

To repeat all tracks on a selected

CD, press CD SKIP to select the de-

sired CD. Then repeatedly press RE-

PEAT until REPEAT ONE DISC

appears.

Repeating All Tracks on All

Loaded CDs

To repeat all tracks on all loaded

CDs, repeatedly press REPEAT until

REPEAT ALL DISC appears.

Repeating a Programmed

Sequence

To repeat a programmed sequence,

press REPEAT while the programmed

sequence is playing. REPEAT ALL

appears, and the CD player continu-

ously replays the programmed se-

quence.

∇

13-1275.fm Page 21 Wednesday, July 14, 1999 3:59 PM

PROGRAMMED PLAY

You can program up to 32 tracks

from any loaded CDs to play in any

order you choose.

Programming and Playing a

Sequence of Tracks

1. Press STOP to cancel any CD

function.

2. Press PROGRAM. The display

shows MEMORY - - - P-01

(the current position in the pro-

grammed sequence).

3. Press CD SKIP to select the CD

containing the tracks you want

to store.

4. Press

SKIP or SKIP

to select the CD’s track number

you want to store.

5. Press PROGRAM. The track is

stored and the display shows

MEMORY - - - P-02.

6. Repeat Steps 3–5 to program

additional tracks.

Note: FULL appears on the dis-

play after you store the 32nd

track. If you try to program more

than 32 tracks, the new track

replaces the 32nd track.

7. Press PLAY/PAUSE. 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.

Notes:

• During play, briefly press or

repeatedly press SKIP or

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.

• Pressing CD SKIP has no effect

while a programmed sequence

plays.

Reviewing the Programmed

Sequence

While play is stopped, repeatedly

press

PROGRAM to review the pro-

grammed sequence.

∇

13-1275.fm Page 22 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.

∇

13-1275.fm Page 23 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.

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.

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 load a cassette

tape in either Deck 1 or Deck 2.

1. Press TAPE. The TAPE indicator

lights.

2. Press STOP/EJECT on either

Deck 1 or Deck 2 to open the

cassette compartment door.

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.

PLAYING A CASSETTE

TAPE

Warnin

: To protect your hearing,

set

VOLUME to its lowest setting be-

fore you begin playing a cassette

tape.

Follow these steps to play a cassette

tape in either Deck 1 or Deck 2.

1. Load the cassette.

2. Press PLAY on the deck you are

using. The tape plays until it

reaches the end of the side, then

it automatically stops.

3. Adjust VOLUME to the desired

listening level.

13-1275.fm Page 24 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.

To temporarily stop playback,

press

PAUSE on the deck you

are using. Press PAUSE again to

continue playback.

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.

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

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.

RECORDING

Notes:

• Be sure the erase-protection tab

for the cassette you want to

record on is in place (see “Pre-

venting Accidental Erasure”).

• The recording level is preset.

Adjusting E-BASS, the graphic

equalizer, or VOLUME does not

affect the recording level or qual-

ity.

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.

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.

13-1275.fm Page 25 Wednesday, July 14, 1999 3:59 PM

2. To record at normal speed for

the best quality sound, set HIGH

SPEED DUBBING to OFF.

To record in half the normal

recording time, set HIGH SPEED

DUBBING to ON.

3. On Deck 1, press PAUSE then

RECORD. PLAY on Deck 1 auto-

matically locks down.

Caution: Do not force down

RECORD. This can damage the

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.

Notes:

• To monitor the tape while it is

copying, adjust VOLUME to a

comfortable listening level.

• If you monitor the tape while

high-speed dubbing, the

sound is distorted.

5. To stop copying, press STOP/

EJECT on Deck 1 and Deck 2.

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

Follow these steps to copy the tracks

from the loaded CDs to a cassette

tape in Deck 1.

1. 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

recording mechanism.

2. Press CD to select the CD

player.

3. Press

OPEN/CLOSE to open the

CD compartment, then load the

desired CDs in the CD player.

13-1275.fm Page 26 Wednesday, July 14, 1999 3:59 PM

Notes:

• To copy a programmed

sequence, store the desired

sequence before continuing

with Step 4.

• To copy a CD’s tracks in ran-

dom sequence, press RAN-

DOM so RANDOM appears on

the display before continuing

with Step 4.

4. Simultaneously press PAUSE on

Deck 1 and PLAY/PAUSE on the

CD player. The system records

from the CD onto the cassette

tape.

5. To stop recording before it auto-

matically stops, press STOP on

the CD player, then press STOP/

EJECT on Deck 1.

Recording from the Tuner or

an External Audio Source

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.

1. 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

recording mechanism.

2. Press TUNER or AUX to select

the desired audio source.

3. Select the desired station or

start the selected audio source,

then press PAUSE 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-

matically stops, press STOP/

EJECT on Deck 1.

13-1275.fm Page 27 Wednesday, July 14, 1999 3:59 PM

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.

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.

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.

To turn off the timer, press TIMER un-

til disappears from the

display. If the tape length is longer

than the timer setting, press STOP/

EJECT on Deck 1.

TIM

13-1275.fm Page 28 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.

Warnin

: To prevent damage to

your hearing, set VOLUME to its min-

imum level before you turn on the

system.

Note:

Your local Radio Shack sells a

wide selection of microphones.

1. Connect an external microphone

to the MIC MIX jack.

2. Press CD, TUNER, TAPE, or AUX

to select the desired audio

source.

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.

5. Sing or talk into the microphone.

The system mixes your voice

with the selected audio source.

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.”

When you finish mixing, remove the

microphone’s plug from the MIC MIX

jack.

13-1275.fm Page 29 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

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.

CLEANER

13-1275.fm Page 30 Wednesday, July 14, 1999 3:59 PM

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).

• Do not store CDs in high tem-

perature, high-humidity loca-

tions. They might warp.

• 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).

TAPE TIPS

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.

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.

Preventing Accidental

Erasure

Cassette tapes have two erase-pro-

tection tabs æ one for each side. To

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.

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.

Note: Removing the erase-protec-

tion tabs does not prevent a bulk

eraser from erasing a cassette tape.

(Needs an illus - show

an erase protection tab

bei

removed with a

screwdriver.

13-1275.fm Page 31 Wednesday, July 14, 1999 3:59 PM

Restoring Tape Tension and

Sound Quality

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.

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.

1. Disconnect power.

2. Open the cassette compartment

doors.

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.

5. When you finish cleaning, press

STOP/EJECT on both decks and

close the cassette compartment

doors.

13-1275.fm Page 32 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

13-1275.fm Page 33 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.

13-1275.fm Page 34 Wednesday, July 14, 1999 3:59 PM

NOTES

13-1275.fm Page 35 Wednesday, July 14, 1999 3:59 PM

RADIO SHACK

A Division of Tandy Corporation

Fort Worth, Texas 76102

7A5 Printed in Hong Kong

RADIO SHACK LIMITED WARRANTY

This product is warranted a

ainst 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-

out char

e for parts and labor. Simply bring your Radio Shack sales

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 dama

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

ives you specific le

al ri

hts and you may also have other ri

hts which vary

from state to state.

We Service What We Sell

9/94

13-1275.fm Page 36 Wednesday, July 14, 1999 3:59 PM

Optimus System 728 Users Manual 13 1275

SYSTEM 728 to the manual de246ff6-0562-4f3e-a2a1-767c50432272

de246ff6-0562-4f3e-a.. de246ff6-0562-4f3e-a2a1-767c50432272

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