Optimus SYSTEM 748 User Manual

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Mini Stereo Component System

Cat. No. 13-1296

OWNER’S MANUAL

Please read before using this equipment.

SYSTEM 748

Sys t em 748

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FEATURES

Your Optimus System 748 Mini Stereo Component System o ffers all the versatile features you need for excellent stereo sound and entertainme nt, com bined in one compact package.

The system includes a 3-disc carousel CD changer with 32-track programmable memory, an AM/FM stereo tuner with 20-station presets, a dual cassette player with high-speed dubbing and auto-stop, and two 3-way speakers with 6-inch woofers, 2-inch midrange speakers, and piezo tweeters.

You can operate many of the system’s functions with its remote control.

AM/FM Stereo Tuner

Memory Tunin

easily select up t o 10 AM and 1 0 FM radio stations.

— lets you store and

Automatic CD Chan

load and play up to three CDs.

Automatic Search

locate and play any track on the loaded CDs.

Audible Search

cate a particular section of a track while it is playing.

Random P l a

ed CDs’ tracks in random order.

Repeat Pla

all tracks on a single CD, all loaded CDs, or a programmed sequence.

Pro

rammable Pla

gram up to 32 selections (tracks or CDs) to play in any order you choose.

5- or 3-Inch CD Compatible

you play either type of CD.

lets you quickly lo-

plays all of the load-

repeats a single track,

æ lets you

lets you quickly

æ lets you pro-

æ lets

CD Player

Eight-Times Oversamplin

proves the CD’s sound by multiplying the standard 44.1 kHz sampling rate by eight and using a digital filter to reduce or eliminate high-frequency distortion.

1-Bit DAC

to-analog conversion circuitry to accurately reproduce all sound levels w ith virtually no distortion.

— uses the latest in digital-

RadioShack and Optimus are registered trademarks used by Tandy Corporation.

— im-

Dual Cassette Player

Multiple Source Recordin

you record onto a cass ette tape from the CD player, a cassette tape, or the radio.

Normal or Hi

lets you dub tapes at normal or twice the normal speed.

h-Speed Dubbing

— lets

CAUTION

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Consecutive Play æ automatically plays one side of two tapes in sequence.

Auto-Stop —

protects the tape and tape-handling parts by automatically stopping the tape when it reaches the end.

Note: The System 748 requires two AAA batteries (not supplied) for the remote control and two AA batteries (not supplied) for system backup.

Important: Most material on compact discs and prerecorded tapes is copyrighted. Unauthorized duplication of copyrighted material is a violation 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 duplicate musical recordings for noncommercial (personal) use.

Compact discs that you can play on your system’s CD player have this mark on them:

Warning: To prevent fire or s hock hazard, do not expose this product to rain or moisture.

RISK OF ELECTRIC SHOCK.

DO NOT OPEN.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER OR BACK. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

This symbol is inten ded to alert yo u to the p r es en c e o f un in su lated dan gerous voltage within the product’s enclosure that mi ght be of suff icient magnitude to constitute a risk of electric shock. Do not open the product’s case.

This symbol is intended to inform you that important operating and

maintenance instructions are included in the literature accompanying this product.

Warnings:

• 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 .

We recommend you record your system’s serial number here. The number is on the back panel.

Serial Number: ________________

• The use of controls, adjustm ents, or procedures other than those specified herein may result in hazardous radiation exposure.

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FCC INFORMATION

This system complies with the limits for a Class B digital device as specified in Part 15 of limits provide reasonable protection against TV or radio interference in a residential area. However, your system might cause TV or radio interf erence even when it is operating properly.

To eliminate interference, you can try one or more of the following corrective measures.

• Reorient or relocate the TV or radio’s receiving antenna.

FCC Rules

. These

• 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 RadioShack store if the problem still exists.

ging

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CONTENTS

Preparation .................................................................................................................... 6

Connectin Connectin Connectin Installin Installin Usin

Basic Operation ............................................................................................................ 9

Usin

Tuner Operation .......................................................................................................... 11

Automatic Tu nin Memory Tunin

CD Player Operation ................................................................................................... 14

Loadin Selectin Playin Chan

Automatic Skip ...................................................................................................... 15

Audible Search ...................................................................................................... 16

Random Play .......................... .. ............................................................................. 16

Repeat Play ........... .. ............ ........... ............ .. ............ .. ........................................... 17

Pro

CD Care Tips ......................................................................................................... 19

Cassette Deck Operation . .......................................................................................... 20

Loadin Playin Usin Recordin

Tape Tips ............................................................................................................... 24

Care and Maintenance ............................................................................................... 25

Cleanin Resettin

Specifications ............................................................................................................. 27

the Speakers ........................................................................................ 6

the FM Antenna .................................. .. .................... .. .................... .. ... 6

to Power ............................................................................................... 6

the System’s Backup Batteries ................................................................ 7

the Remote Control’s Batteries ................................................................ 7

Headphones ............ .. .......... .............................. .. .......... .. .......... .. .......... .. ...... 8

Listenin

the Remote Control ..................................................................................... 10

rammed Play .................................................................................................. 17

Pro Reviewin Erasin

Consecutive Play ........................................................................................ 21

Dubbin Recordin Recordin

Preventin Erasin Restorin

Safely ................................................................................................ 8

.................................................................................................. 12

..................................................................................................... 12

a CD ........................................................................................................ 14

a CD ...................................................................................................... 14

a CD ......................................................................................................... 15

CDs During Playback ............................................................................ 15

ramming and Playing a Sequence of Tracks ............................. .. .. ......... 17

the Programmed Sequence .......................................................... 18

the Programmed Sequence .............................................................. 18

a Cassette Tape .......... .......... .. ................................................... .. ........... 20

a Cassette Tape ....................................................................................... 20

on a Cassette ....................................................................................... 21

(Copying) Cassette Tapes ............................................................... 22

from a CD ..................................................................................... 23

from the Tuner .............................................................................. 23

Accidental Erasure ....................................................................... 24

a Cassette Tape ................................................................................ 24

Tape Tension and Sound Quality ................................................... 24

the Tape- Handling Parts ........................................................................ 26

the System ............................................................................................ 26

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PREPARATION

Complete all other connections

Note:

before you connect the system to AC power and turn it on.

CONNECTING THE SPEAKERS

show speaker connecti ons

1. Press the red speaker terminal tab labeled back of the system, put the stripped end of the right speak er ’s striped wire into the t erminal, then release the tab.

SPEAKER R

on the

CONNECTING THE FM ANTENNA

Press the black FM antenna terminal tabs labeled of the system , put the stripped end of the supplied FM antenna wires into the terminals, then release the tabs.

show antenna terminals locati on

FM ANTENNA

on the back

CONNECTING TO POWER

After you complete all other connections, plug the system’s power cord into a standard AC o utlet. STANDBY lights.

2. Press the black speaker terminal tab labeled back of the system, put the stripped end of the right speak er ’s other wire into the terminal, then release the tab.

3. Repeat Steps 1 and 2 to connect the left speaker to the

and

SPEAKER R

terminals.

on the

SPEAKER L

show STANDBY indicator lit w/callout arrow

Warnin

the power cord plug’s blades are polarized and fit a polarized AC outlet only one way. If you have difficulty inserting the plug, do not force it. Turn it over and reinsert it.

To prevent electric shock,

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INSTALLING THE SYSTEM’S BACKUP BATTERIES

To retain the preset radio stations during an AC power loss , insta ll two al kaline AA batteries (such as Cat. No. 23-

557) into the system’s battery compartment.

1. Push in the battery compartment cover’s tab and lift off the cover.

Show battery cover being removed

2. Put the AA batteries into the compartment as indicated by the polarity symbols (+ and –) marked inside.

3. Replace the cover.

We recommend you replace the system’s backup batteries every year to ensure it retains the preset radio stations.

INSTALLING THE REMOTE CONTROL’S BATTERIES

The remote control requires two AA A batteries (not supplied) for power. We recommend alkaline batteries, such as RadioShack Cat. No. 23-555 for the best performance and longest life.

1. Press the tab in the direction of the arrow and lift off the battery compartment cover.

Show battery cover being removed

Cautions:

• Use only fresh batteries of the required size and recommended type.

• Never leave dead or we ak batteries in the remote control. Batteries can leak chemicals that can corrode the control.

• Do not mix old and new batteries, different types of batteries (standard, alkaline, or rechargeable), or rechargeable batteries of different capacities.

2. Insert the batteries as indicated by the polarity symbols ( marked inside.

show batteries being instal led

3. Replace the cover.

and -)

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Caution: If you are not going to use the remote control for a month or more, remove its batteries. Batteries can leak damaging chemicals.

You can use the remote control up to a distance of about 25 feet. If the remote control operates erratically or does not work, replace both batteries.

USING HEADPHONES

You can use headphones (not supplied) to listen in privacy. Insert the headphones’

PHONES

to the

show PHONES jack location

/8-inch (3.5 mm) plug in-

ack.

Listening Safely

To protect your hearing, follow these guidelines when you use headphones.

• Do not listen at extremely high volume levels. Extended highvolume listening can lead to permanent hearing loss.

• Set the volume to the lowest setting 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:

• Connecting headphones automatically disconnects the speakers.

• Your local RadioShack store sells a wide selection of headphones.

〈

show location of

VOLUME

show location of

X-BASS

show location of

STEREO WIDE

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BASIC OPERATION

Follow these steps to operate your system.

1. Press

POWER

to turn on the system. STANDBY turns off, the display lights, and the last selected system settings appear.

show location of POWER b u tto n

2. Set

TAPE/TUNER/CD

to select the mode, so appears around the selected mode.

show location of TAPE/TUNER/CD switch

3. If you selected

TUNER

, see “Tuner Operation” on Page 11 for how to select a station.

4. Adjust

VOLUME

〉

to a

comfortable listening level.

5. To emphasize bass s ounds, press

X-BASS

bass sounds, press

so appears around

. To return to normal

X-BASS

ain

6. To emphasize the stereo effect,

STEREO WIDE

press pears around

so ap-

STEREO WIDE

. To

return to normal stereo effect,

STEREO WIDE

press

ain

If you selected

TA PE

, see “Cassette Deck Operation” on Page 20 or “CD Player Operation” on Page 14 for how to play a CD or cassette tape.

7. To turn off the system, press

POWER

. STANDBY lights.

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USING THE REMOTE CONTROL

The remote control’s buttons have the same functions as the corresponding buttons on the main system.

illustration of remote control

To use the remote c ontrol, point it to-

REMOTE SENSOR

ward and press the desired buttons.

show location of remote sensor receiv er

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.

on the system

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TUNER OPERATION

1. Set

TAPE/TUNER/CD

TUNER

The system automatically tunes to the station that was playing when the system was turned off or when it was last set to

2. Set

AM/FM

TUNER

to the desired band. The selected band and the last selected station in that band appear.

show location of AM/FM button

Notes:

• The system uses a bu ilt-in fer-

rite antenna for AM reception. For the best AM reception, rotate the system.

• For the best FM reception, fully

extend the FM antenna.

3. Press

TUNING +

–

to tune up or down the selected band. The frequency changes on the display.

You can also use automatic tuning (see “Automatic Tuning” on Page 12) or memory tuning (see “Memory Tuning” on Page 12).

Notes:

•Set

FM STEREO/FM MONO

FM STEREO

to select stereo.

The FM STEREO indicator lights when you rece ive an FM broadcast in stereo.

• To improve reception for weak

FM MONO

FM STE-

FM stereo stations, se t

REO/FM MONO

(monaural). The sound is no longer in stereo, but reception should improve.

show location of FM STEREO/FM MONO switch

4. Adjust the volume and set

STEREO WIDE

and

for the desired

X-BASS

sound.

show location of TUNING buttons

MEM-

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AUTOMATIC TUNING

You can use automatic tuning to skip to the next available station in your area.

Press

AUTO SCAN

. The tuner automatically searches up the band and stops when it finds the next active station.

show location of AUTO SCAN

MEMORY TUNING

You can store up to 10 AM and 10 FM stations in memory.

2. Tune to the station you want to store, then press

MEM-

show location of MEMORY

appears.

MEMORY

3. To store stations into memory locations 1–5, press a memory location button (

). The station is stored,

1/6, 2/7, 3/8, 4/9

, or

MEM-

disappears, and the display shows the frequency and the memory location number.

show location of

1/6, 2/7, 3/8, 4/9, 5/0 buttons

Note:

You can assign one frequency to each memory location. When you assign another frequency to the same memory location, the new frequency replaces the old one.

1. Set

AM/FM

to the desired band.

Note:

appears for only 3

seconds. If disappears

MEM-

before you press a memory location button, start again from Step

2. To store stations into memory lo-

cations 6–10, press

SHIFT

then location button (

5/0

). disappears, and the

then press a memory

1/6, 2/7, 3/8, 4/9

MEMORY

, or

display shows the frequency and the memory location number.

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Note: This i ncreases the m emory location number by 5. For example, if you press

SHIFT

, then

MEMORY

5/0

, the radio stores

, then

the selected frequency into memory location 10.

4. Repeat Steps 1–3 for the other band.

To recall preset stations 1–5, simply press the desired memory location button. To recall preset st ations 6– 10,

SHIFT

press

, then press the desired

memory location button.

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CD PLAYER OPERATION

LOADING A CD

TAPE/TUNER/CD

1. Set

2. Press CD compartment.

OPEN/CLOSE

to open the

Notes

• Track number tray number appear while the system checks each tray.

• If the system finds a n empty tray, the tray number disappears and the system checks the next tray.

and the current

show location of OPEN/CLOSE

The CD carousel has three

Note:

trays, each labeled with numbers, 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.

To load a CD in the third tray,

DISC SKIP

press tates, exposing the other tray.

show location of DISC SKIP

. The carousel ro-

• If the system finds a tray with a CD, the tray number and the number of tracks on that CD appear.

show display - disc 3, 10 tracks

SELECTING A CD

To select a CD , press fore or during play.

If the system is playin g a CD, it stops playing it and begins pl aying the first track of the selected CD.

DISC SKIP

be-

4. After you load the CDs, press

OPEN/CLOSE

compartment. The system displays the current tray number, and the number of tracks on that CD.

to close the CD

show SKIP locations

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PLAYING A CD

After loading a CD, follow these steps to pla y i t .

1. Press

PLAY/PAUSE

show PLAY/P AUSE location

The CD in the current tray begins to play from Track 1. The system displays , the current tray num ber, and the CD’s current track number.

Notes:

• If a tray does not contain a CD,

appears. The system skips that tray and automatically plays the CD in the next tray.

4. The system plays all the loaded CDs once, then stops. To stop play sooner, press

show STOP location

STOP

CHANGING CDs DURING PLAYBACK

To open the disc t ray without stopping playback, press CD changer. The tray opens and the current CD continues to pla y. You c an then change the CDs in the two front trays.

OPEN/CLOSE

on the

• During playback, if the CD player is subjected to a sudden shock or jolt, the rotation speed might change or some noise might be produced. This is not a malfunction.

2. Adjust the volume and set for the desired sound.

3. To temporarily stop play, press

PLAY/PAUSE

resume play, press

PAUSE

again.

. appears. To

X-BASS

PLAY/

AUTOMATIC SKIP

The automatic skip feature lets you quickly locate the beginning of any track on a CD, including the t rack currently playing, and search forward or backward through the tracks. Yo u can use automatic skip when a CD is playing or stopped.

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If a CD is playing:

•Press

SKIP

once to skip to

the beginning of the next track.

•Press

SKIP

once to skip back to the beginning of the current track.

• Repeatedly press skip backward or

SKIP

to skip forward to the beginning of the desired track.

If the CD is stopped or paused, repeatedly press

SKIP

until the system displays the number of the track you want to play, then

PLAY/PAUSE

press

. The CD play-

er starts playing the selected track.

AUDIBLE SEARCH

Hold down

to search forward or backward during play. The CD plays rapidly and you hear the music at a high speed and low volume.

RANDOM PLAY

This feature randomly selects and plays tracks from all loaded CDs.

To randomly select tracks from

Note:

only one or two CDs, you must load only those CDs in the CD tray.

1. Press CD function.

2. Press pears.

3. Press track plays, the system randomly selects another track and pla ys it, continuing until all tracks on all loaded CDs have played.

Notes:

STOP

to cancel any other

RANDOM

show RANDOM location

PLAY/PAUSE

RANDOM

. After one

ap-

show SEARCH locations

• To repeat the current track,

press

SKIP

next random track, press

. To play the

SKIP

• To repeat random play, before

the last track ends, press

PEAT

until

REPEAT ALL

RE-

appears. See “Repeat Play” on Page 17.

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4. To briefly stop random play, press

PLAY/PAUSE

y y

. appears. To

resume play, press it again.

5. To stop random play, press then

RANDOM

STOP

disap-

pears.

REPEAT PLAY

You can repeat a single track on a s elected CD, all tracks on a selected CD, all tracks on all loaded CDs, or a programmed sequence (see Programmed Play”).

show REPEAT location

To repeat a single track

PEAT

once while the desired track is

playing.

REPEAT ONE

, press

appears, and the CD player continuously replays the track.

To repeat all tracks on a selected CD

DISC SKIP

press

to select the desired

CD. Then repeatedly press

REPEAT ONE DISC

until

appears.

To repeat all tracks on all loaded CDs

repeatedly press

PEAT

ALL DISC

REPEAT

appears.

until

RE-

REPEAT

RE-

To cancel repeat play at any time, repeatedly press

REPEAT

disappears.

PROGRAMMED PLAY

You can program up t o 32 selections (tracks or CDs) from any loaded CDs to play in any order you choose.

Programming and Playing a Sequence of Tracks

1. Press CD function.

2. Press

show display with flashing –’s

3. Press containing the tracks you want to store. The disc number appears.

4. Press select the track number you want

to store. The selected track number appears.

Or, press the entire CD as one selection.

(all) appears.

5. Press track. blank program selection screen.

STOP

to cancel any other

PROGRAM

DISC SKIP

SKIP

PROGRAM

The display returns to the

. You see:

to select the CD

to store the

REPEAT

until

SKIP

twice to store

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6. Repeat Steps 3–5 to program more selections. The display shows how many selections you have stored.

Note: You cannot store more than 32 selections. Any track or CD stored after the 32 nd selection replaces that track or CD.

7. Press

PLA Y/P AUSE

to play the tracks in the programmed order. The system displays the current tray number and track number.

8. Programmed play automatically stops at the end of the last programmed track. To stop the CD player at any time during programmed play, press

STOP

. The last programmed CD’s number and number of tracks appear.

Notes:

• You can use and

to move between selec-

SKIP

tions during programmed play.

• You cannot use random play dur-

ing programmed play.

• To repeat a programmed se-

quence, press

PEAT

ALL

appears. The CD

REPEAT

until

RE-

player continuously replays the programmed sequence.

•Pressing

DISC SKIP

has no effect while a programmed sequence plays.

GRAM

until the selection number you want to replace appears. Then repeat Steps 3–5 to select and store the new selection. The new selection replaces the previous selection.

• To add a selection while play is stopped, press

PROGRAM

once so the blank program selection display appears. Then repeat Steps 3–5 to selec t and store the new selection. The new selection is added to the end of the programmed sequence.

Reviewing the Programmed Sequence

While play is stopped, repeatedly press

PROGRAM

to review the programmed sequence . You see the selection number and the track’s sequence number.

Erasing the Programmed Sequence

To erase the entire programmed sequence, press

GRAM

disappears and the cu rrent tray

STOP

twice.

number and the total number of tracks appear. You can also erase the programmed sequence by sliding

TUNER/CD

pressing

TAPE

OPEN/CLOSE

TUNER

PRO-

TAPE/

, or by

• To replace a selection while play is stopped, repeatedly press

PRO-

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CD CARE TIPS

Even though a compact disc is very durable, treat the CD’s surface with care. We recommend the following precautions:

• Do not place any thing but a CD in the disc tray. This can damage the drive mechanism.

• 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 hightemperature, high-humidity locations. The CDs might warp.

• Keep CDs dry. A water drop can act as a lens and affect the las er beam’s focus.

• Always handle a C D by the edges to avoid fingerprints and always keep it in its protective case or sleeve when not in use. Fingerprints and scratches on the CD’s surface can prevent the laser beam from correctly reading the digital information. To clean the CD’s surface, use a CD cleaner kit (such as Cat. No. 42-225). If the CD gets scratched, use Scratch ’n Fix (RadioShack Cat. No. 42-

127).

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CASSETTE DECK OPERATION

The system has two cassette decks. You can use bo th f or no rmal pl ay back and consecutive play, and you can also use Deck 1 for dubbing (recording).

Both Deck 1 (1 RECORD/PLAYBACK) and Deck 2 (PLAYBACK 2) have a full-release auto-stop system to protect tapes and prevent pinch roller damage. Wh en a tape reaches the end of a side, the tape mechanism automatically stops and releases the tape.

LOADING A CASSETTE TAPE

Follow these steps to load a cassette tape in either Deck 1 or Deck 2.

Note:

the same deck where you loaded the tape .

Use the control buttons under

1. Take up any slack in the tape by turning the cassette’s hub with a pencil. If you do not remove excess slack, the tape might become tangled in the record/ playback mechanism. Avoid touching the tape.

2. Press the cassette compartment door.

3. Put the cassette tape into the tape guides in the compartment door, with its exposed tape edge facing down, the side you want play facing you, and its full reel to the left.

4. Gently close the compartment door.

STOP/EJECT

show STOP/EJECT location

to open

PLAYING A CASSETTE TAPE

After loading a cassette tape, follow these steps to play it.

T APE/TUNER/CD

1. Set

PLAY

2. Press til it reaches the end of the side, then it automatically stops.

. The tape plays un-

show PLAY location

TA PE

show pencil in cassette hub

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Notes:

• To temporarily stop playback,

PAUSE

press

again to continue playback.

show PAUSE location

. Press

PAUSE

• To fast-forward or rewind the tape, press then press

WIND

show FAST-F and REWIND location

STOP/EJECT

FAS T-F

RE-

• To stop fast-forward or rewind,

STOP/EJECT

press

3. Adjust the volume and set

WIDE

REO

and

X-BASS

STE-

for the de-

sired sound.

4. To manually stop play, press

STOP/EJECT

To open the cassette compartment, 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 Dec k 2, then automatically play one side of a tape in Deck 1.

1. Load the cassette you want to hear first in Deck 2 and the second cassette in Deck 1.

PLA Y

2. Press

on Deck 2. The cas-

sette in Deck 2 plays.

3. While the cassette in Deck 2 is playing, press

PA US E

then

PLAY

on Deck 1.

The tape in Deck 2 plays until it reaches the end of the side. Then Deck 1 plays until the tape reaches the end of the side.

RECORDING ON A CASSETTE

You can record from the CD player or tuner to a cassette in Deck 1, or d ub (copy) from a cassette in Deck 2 to a cassette in Deck 1.

Caution: If you use a cassette tape with the erase-protection tabs removed, do not force down This can damage the recording mechanism. See “Preventing Accidental Erasure” on Page 24.

RECORD

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Notes:

• Tape quality greatly affects the quality of the recording. We recommend regular length (60- or 90minute) cassette tapes. For lownoise, wide-range recordings, u se normal-bias tape.

• The recording level is preset.

BASS UME

STEREO WIDE

, and

have no effect on the reco rd-

X-

VOL-

ing level or quality.

Dubbing (Copying) Cassette Tapes

You can copy from one cassette tape to another at normal or high speed, and you can monitor the t ape as you dub it.

1. Load a blank cassette tape, or one you want to record over, into Deck 1 with the full reel to the left and the side you want to record on facing you.

2. Load the cassette you want to copy from into Deck 2.

3. To record at normal speed, set

DUBBING to NORM

To record at twice the normal recording speed, set

HIGH

DUBBING

Note: High speed dubbing produces a slightly lower quality recording.

PAUSE

RECORD

and

PAUSE

then

. Deck 1

4. On Deck 1, press

RECORD . PLAY

lock down.

5. On Deck 2, press automatically releases

PLAY

and the system copi es the tape i n 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

dubbing at high speed, the sound is distorted.

6. To stop copying, press

EJECT

on Deck 1 and Deck

STOP/

When the tape in either d eck 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.

show DUBBING set to NORM

Beat Cut location

13-129 6.fm Page 23 Wednesday, J uly 14, 1999 7: 16 PM

Recording from a CD

1. Load a blank cassette tape, or one you want to record over, into Deck 1.

2. Press

PLAY

P AUSE

and

then

down.

3. Set

TAPE/TUNER/CD

4. Load the desired CDs in the CD player.

5. Select the desired CD track or program a sequence (if you do not want to record an entire CD in order).

: To copy a CD’s tracks i n ran-

Hint

dom sequence, press

RANDOM

6. Press both and

appears.

PAUSE

PLAY/PAUSE

player. Recording starts when

PAUSE

releases.

RECORD

lock

to CD.

RANDOM

on Deck 1

on the CD

3. Set

TAPE/TUNER/CD

TUNER

4. Select the desired station, then press

PAUSE

on Deck 1 to release it and start recording. The system records on the cassette

until it reaches the end of the side, then the cassette deck automatically stops.

Notes:

• To temporarily stop recording,

press

PAUSE

. Press

PAUSE

again to resume recording.

• If you record broadcasts from

AM radio, you might hear a lowvolume hum when you play back the recording. If this occurs, set

BEAT CUT

to the other

position and try again.

7. To stop recording before it auto-

STOP

matically stops, press the CD player, then press

EJECT

on Deck 1.

STOP/

Recording from the Tuner

1. Load a blank cassette tape, or one you want to record over, into Deck 1.

2. Press

PLAY

down.

P AUSE

then

and

RECORD

lock

5. To stop recording before it automatically stops, press

EJECT

on Deck 1.

STOP/

13-129 6.fm Page 24 Wednesday, J uly 14, 1999 7: 16 PM

TAPE TI PS

Preventing Accidental Erasure

Cassette tapes have two eraseprotection tabs To protect a recording from bein g accidentally recorded over or erased, use a screwdriver to remove one or both of the cassette tape’s eraseprotection tabs.

show Side A erase protection tab

being removed with a screwdriver

If you want to record on a tape side after you have removed the eraseprotection tab, place a piece of strong plastic tape over that side’s eraseprotection hole.

Notes:

• Be sure you cover only the hole originally covered by the eraseprotection tab.

• Removing the erase-protection tabs does not prevent a bulk eraser from erasing a cassette tape.

one for each side.

Erasing a Cassette Tape

To erase a previously recorded section of a tape, simply record over it. To erase the entire cassette tape, let t he tape record to the end with no source playing.

You can quickly erase both sides of a cassette tape using a bulk tape eraser (such as Cat. No. 44-232, not supplied), available at your local RadioShack store.

Resto r ing Tape Tension and Sound Quality

After you play a cassette tape several times, the tape might become tightly wound on the reels. This can cause playback sound quality to deteriorate.

To restore the sound quality, fastforward the tape from the beginning to the end of one side, then completely rewind it. Then loosen the t ape reels by gently tapping each side of the cassette’s outer shell on a flat surface.

Caution:

the cassette when tapping it. Do not touch the exposed tape or allow any sharp objects near the cassette.

Be careful not to damage

13-129 6.fm Page 25 Wednesday, J uly 14, 1999 7: 16 PM

CARE AND MAINTENANCE

Your Optimus System 748 Mini Stereo Component S y stem is an example of superior design an d craft smans hi p. The follow ing sugg estio ns will h elp you c are for the system so you can enjoy it for years.

Keep the system dry. If it gets wet, wipe it dry imm ediately. Liquids might contain minerals that can corrode the electronic circuits.

Handle the system gently and carefully. Dropping it can dam age circuit boards and cases and can cause the system t o work i mproperly.

Use and store the system only in normal temperature environments. Temperature extremes can shorten the life of electronic devices, damage batteries, and distort or melt plastic parts.

Keep the system away from dust and dirt, which can cause premature 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 detergents to clean the system.

Modifying or tampering with the system’s internal component s can cause a malfunction and might invalidate your system’s warranty and void your FCC authorization to operate it. If your s ystem is not performing as it should, ta ke it to your lo cal RadioShack store for assistance.

13-129 6.fm Page 26 Wednesday, J uly 14, 1999 7: 16 PM

CLEANING THE TAPEHANDLING 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 procedu re after every 20 hours of tape player operation. Your local RadioShack store sells a wide selection of cassette deck cleaning supplies.

1. Disconnect power.

2. Open the cassette compartment doors.

3. Press expose the tape-handling parts.

4. Use a cotton swab dipped in denatured alcohol or tape head cleaning solution to clean the record/play heads, pinch rollers, capstans, tape guides, and erase head.

PLAY

on both decks to

Deck 2

5. When you finish cleaning, press

STOP/EJECT

close the cassette compartment doors, and reconnect power.

on both decks,

RESETTING THE SYSTEM

If the system does not operate properly and you are not sure why, unplug the AC power cord for about 5 minutes to reset the system. Then plug it in again.

Deck 1

13-129 6.fm Page 27 Wednesday, J uly 14, 1999 7: 16 PM

SPECIFICATIONS

Cassette

Tape Speed .. ......................................................................... 1

Wow and Flutter ................................................................................ 0.35% WRMS

Frequency Response ............................................................. 125 Hz–8 kHz ±4 dB

Recording System ...................................................................................... AC Bias

Erase System ............................................................................................ Magnetic

/8 ips (4.75 cm/sec)

CD Pla

Number of Tracks to be Programmed ..................................................... 32 Tracks

Frequency Response (±3 dB) ............................................................ 40 Hz–16 kHz

Dynamic Range .............................................................................................. 85 dB

Signal-to-Noise ................................................................................... (JIS-A) 70 dB

Harmonic Distortion (at 1 kHz) ........................................................................ 0.5%

Separation (at 1 kHz) ...................................................................................... 50 dB

Sampling Frequency .................................................................................. 44.1 kHz

Quantiza tion Number .......... ........................ ................ ........................ .............. 1 Bit

Oversampling ............................................................................................. 8 Times

Pick-Up System ........................................................................................... 3 Beam

Optical Source ....................................................................... Semiconductor Laser

Wavelength .................................................................................................. 790 nm

General

Power Supply ...................................................................... 120V AC , 60 Hz, 70 W

Power Output ........................................................................ 10 Watts per Channel

Tuning Range ............................................................................ AM: 530–1710 kHz

FM: 88–108 MHz

Speaker Dimensions (HWD) ......................................... 11

/16 × 87/8 × 913/16 Inches

(300

225 × 250 mm)

Speaker Size .............................................................................................. 6 Inches

Speaker Impedance .................................................................................... 4 Ohms

Dimensions of Unit (HWD) .......................................... 11

/16 × 113/8 × 145/8 Inches

(300

288 × 372 mm)

Weight .................................................................................................... 27 lbs 5 oz

(12.4 kg)

Specifications are typical; individual units m ight vary. Specifications are subj ect to change and improvement without notice.

13-129 6.fm Page 28 Wednesday, J uly 14, 1999 7: 16 PM

Limited Ninety-Day Warranty

This product is warrant ed by RadioShac k against man ufacturing d efects in materia l and workmanship under normal use for ninety (90) day s from the date of purc hase from Rad ioShack comp anyowned stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRE SS WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL H AVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RESPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of incidental or consequential damages, so the above limitations or exclusions may not apply to you. In the event of a product defect during the warran ty period, take the product and the RadioShack sales receipt as proof of pur cha se date to any RadioS hack s tore. Radi oSha ck wil l, at its option, unless otherwise provided by l aw: (a) c orre ct the defe ct by product repai r without c har ge for parts and labor; (b) replace the produc t with one of the same or similar design; or (c) refund the purchase price. All replaced parts and pr oducts, and pro ducts on which a refund is made, become the property of RadioShack. New or rec onditioned parts and products may be used in the performance of warranty service. Repa ired or replaced parts and produ cts are warranted for the remainder of the original warranty period. You will be charged for repair or replacement of the product made after the expiration of the warranty period. This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse, accident, misuse, impr oper or abnormal usa ge, failure to fol low i nstruct ions, improper instal lation or maintenance, alterati on, lightning or other incidence of exc ess voltage or current; (b) any repairs other than those provi ded by a RadioShack Autho rized Service Facility; ( c) consumables such as fuses or batteries; (d ) cosmeti c dam age; (e) transp ortatio n, sh ipping or insuranc e c osts; or (f) cos ts of product removal, installation, set-up service adjustment or reinstallation. This warranty gives you specifi c legal rights, and you may also have oth er rights which vary from state to state.

RadioShack Customer Relations, Dept. W, 100 Throckmorton St., Suite 600, Fort Worth, TX 76102

We Service What We Sell

3/97

RadioShack

A Division of Tandy Corporation

Fort Worth, Texas 76102

7A7 Printed in Hong Kong

Optimus SYSTEM 748 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual