13-1296.fm Page 1 Wednesday, July 14, 1999 7:16 PM
Cat. No. 13-1296
OWNER’S MANUAL
Please read before using this equipment.
SYSTEM 748
System 748
Mini Stereo Component System
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Consecutive Play æ automatically
plays one side of two tapes in se-
quence.
Warning: To prevent fire or shock
hazard, do not expose this prod-
uct to rain or moisture.
Auto-Stop — protects the tape and
tape-handling parts by automatically
stopping the tape when it reaches the
end.
CAUTION
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.
Note: The System 748 requires two
AAA batteries (not supplied) for the re-
mote control and two AA batteries (not
supplied) for system backup.
This symbol is intended to alert you
to the presence of uninsulated dan-
gerous voltage within the product’s
enclosure that might be of sufficient
magnitude to constitute a risk of
electric shock. Do not open the
product’s case.
Important: Most material on compact
discs and prerecorded tapes is copy-
righted. 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, how-
ever, 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.
This symbol is intended to inform
you that important operating and
maintenance instructions are in-
cluded in the literature accompany-
ing this product.
!
Warnings:
Compact discs that you
can play on your sys-
tem’s CD player have
this mark on them:
• 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.
• The use of controls, adjustments,
or procedures other than those
specified herein may result in haz-
ardous radiation exposure.
We recommend you record your sys-
tem’s serial number here. The number
is on the back panel.
Serial Number: ________________
3
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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 corrective
measures.
• Reorient or relocate the TV or ra-
dio’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 RadioShack store if
the problem still exists.
4
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13-1296.fm Page 5 Wednesday, July 14, 1999 7:16 PM
CONTENTS
Preparation .................................................................................................................... 6
Connecting the Speakers ........................................................................................ 6
Connecting the FM Antenna ................................................................................... 6
Connecting to Power ............................................................................................... 6
Installing the System’s Backup Batteries ................................................................ 7
Installing the Remote Control’s Batteries ................................................................ 7
Using Headphones .................................................................................................. 8
Listening Safely ................................................................................................ 8
Basic Operation ............................................................................................................ 9
Using the Remote Control ..................................................................................... 10
Tuner Operation .......................................................................................................... 11
Automatic Tuning .................................................................................................. 12
Memory Tuning ..................................................................................................... 12
CD Player Operation ................................................................................................... 14
Loading a CD ........................................................................................................ 14
Selecting a CD ...................................................................................................... 14
Playing a CD ......................................................................................................... 15
Changing CDs During Playback ............................................................................ 15
Automatic Skip ...................................................................................................... 15
Audible Search ...................................................................................................... 16
Random Play ......................................................................................................... 16
Repeat Play ........................................................................................................... 17
Programmed Play .................................................................................................. 17
Programming and Playing a Sequence of Tracks .......................................... 17
Reviewing the Programmed Sequence .......................................................... 18
Erasing the Programmed Sequence .............................................................. 18
CD Care Tips ......................................................................................................... 19
Cassette Deck Operation ........................................................................................... 20
Loading a Cassette Tape ...................................................................................... 20
Playing a Cassette Tape ....................................................................................... 20
Using Consecutive Play ........................................................................................ 21
Recording on a Cassette ....................................................................................... 21
Dubbing (Copying) Cassette Tapes ............................................................... 22
Recording from a CD ..................................................................................... 23
Recording from the Tuner .............................................................................. 23
Tape Tips ............................................................................................................... 24
Preventing Accidental Erasure ....................................................................... 24
Erasing a Cassette Tape ................................................................................ 24
Restoring Tape Tension and Sound Quality ................................................... 24
Care and Maintenance ............................................................................................... 25
Cleaning the Tape- Handling Parts ........................................................................ 26
Resetting the System ............................................................................................ 26
Specifications ............................................................................................................. 27
5
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PREPARATION
Note: Complete all other connections
before you connect the system to AC
power and turn it on.
CONNECTING THE FM
ANTENNA
Press the black FM antenna terminal
tabs labeled FM ANTENNA on the back
of the system, put the stripped end of
the supplied FM antenna wires into
the terminals, then release the tabs.
CONNECTING THE
SPEAKERS
show antenna terminals location
show speaker connections
CONNECTING TO
POWER
1. Press the red speaker terminal tab
After you complete all other connec-
tions, plug the system’s power cord in-
to a standard AC outlet. STANDBY
lights.
+
labeled SPEAKER R
on the
back of the system, put 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 - on the
back of the system, put the
stripped end of the right speaker’s
other wire into the terminal, then
release the tab.
show STANDBY indicator lit
w/callout arrow
3. Repeat Steps 1 and 2 to connect
Warning: To prevent electric shock,
the power cord plug’s blades are po-
larized 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.
the left speaker to the SPEAKER L
+
and -terminals.
6
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13-1296.fm Page 7 Wednesday, July 14, 1999 7:16 PM
We recommend you replace the sys-
tem’s backup batteries every year to
ensure it retains the preset radio sta-
tions.
INSTALLING THE
SYSTEM’S BACKUP
BATTERIES
To retain the preset radio stations dur-
ing an AC power loss, install two alka-
line AA batteries (such as Cat. No. 23-
557) into the system’s battery com-
partment.
INSTALLING THE
REMOTE CONTROL’S
BATTERIES
1. Push in the battery compartment
cover’s tab and lift off the cover.
The remote control requires two AAA
batteries (not supplied) for power. We
recommend alkaline batteries, such
as RadioShack Cat. No. 23-555 for
the best performance and longest life.
Show battery cover
being removed
1. Press the tab in the direction of
the arrow and lift off the battery
compartment cover.
2. Put the AA batteries into the com-
partment as indicated by the po-
larity symbols (+ and –) marked
inside.
Show battery cover
being removed
3. Replace the cover.
Cautions:
• Use only fresh batteries of the re-
quired size and recommended
type.
2. Insert the batteries as indicated by
the polarity symbols (+ and -)
marked inside.
• Never leave dead or weak batter-
ies in the remote control. Batteries
can leak chemicals that can cor-
rode the control.
show batteries being installed
• Do not mix old and new batteries,
different types of batteries (stan-
dard, alkaline, or rechargeable),
or rechargeable batteries of differ-
ent capacities.
3. Replace the cover.
7
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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.
Listening Safely
To protect your hearing, follow these
guidelines when you use headphones.
• Do not listen at extremely high
volume levels. Extended high-
volume listening can lead to per-
manent hearing loss.
You can use the remote control up to
a distance of about 25 feet. If the re-
mote control operates erratically or
does not work, replace both batteries.
• Set the volume to the lowest set-
ting before you begin listening. Af-
ter you begin listening, adjust the
volume to a comfortable level.
USING HEADPHONES
You can use headphones (not sup-
plied) to listen in privacy. Insert the
headphones’ 1/8-inch (3.5 mm) plug in-
• 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.
PHONES
to the
jack.
show PHONES jack location
Notes:
• Connecting headphones automat-
ically disconnects the speakers.
• Your local RadioShack store sells
a wide selection of headphones.
8
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13-1296.fm Page 9 Wednesday, July 14, 1999 7:16 PM
BASIC OPERATION
Follow these steps to operate your
system.
4. Adjust VOLUME
/
to a
comfortable listening level.
1. Press POWER to turn on the sys-
tem.
STANDBY turns off, the
display lights, and the last se-
lected system settings appear.
show location of
VOLUME
5. To emphasize bass sounds, press
X-BASS so
appears around
show location of
POWER button
X-BASS. To return to normal
bass sounds, press X-BASS again.
2. Set TAPE/TUNER/CD to select the
mode, so
the selected mode.
appears around
show location of
X-BASS
6. To emphasize the stereo effect,
show location of
TAPE/TUNER/CD switch
press STEREO WIDE so
ap-
pears around STEREOWIDE. To
return to normal stereo effect,
press STEREO WIDE again.
3. If you selected TUNER, see “Tuner
Operation” on Page 11 for how to
select a station.
If you selected TAPE or CD, see
“Cassette Deck Operation” on
Page 20 or “CD Player Operation”
on Page 14 for how to play a CD
or cassette tape.
show location of
STEREO WIDE
7. To turn off the system, press
POWER. STANDBY lights.
9
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To use the remote control, point it to-
REMOTE SENSOR
and press the desired buttons.
USING THE REMOTE
CONTROL
ward
on the system
The remote control’s buttons have the
same functions as the corresponding
buttons on the main system.
show location of remote
sensor receiver
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 re-
duce the remote control’s operat-
ing range.
illustration of remote control
10
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13-1296.fm Page 11 Wednesday, July 14, 1999 7:16 PM
TUNER OPERATION
1. Set TAPE/TUNER/CD to TUNER.
You can also use automatic tuning
(see “Automatic Tuning” on
Page 12) or memory tuning (see
“Memory Tuning” on Page 12).
The system automatically tunes to
the station that was playing when
the system was turned off or when
it was last set to TUNER.
Notes:
2. Set AM/FM to the desired band.
The selected band and the last
selected station in that band ap-
pear.
• Set FM STEREO/FM MONO to
FM STEREO to select stereo.
The FM STEREO indicator
lights when you receive an FM
broadcast in stereo.
• To improve reception for weak
FM stereo stations, set FM STE-
REO/FM MONO to FM MONO
(monaural). The sound is no
longer in stereo, but reception
should improve.
show location of AM/FM button
Notes:
• The system uses a built-in fer-
rite antenna for AM reception.
For the best AM reception, ro-
tate the system.
show location of
FM STEREO/FM MONO
switch
• For the best FM reception, fully
extend the FM antenna.
4. Adjust the volume and set X-BASS
and STEREO WIDE for the desired
sound.
3. Press TUNING + or – to tune up or
down the selected band. The fre-
quency changes on the display.
show location of
TUNING buttons
11
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13-1296.fm Page 12 Wednesday, July 14, 1999 7:16 PM
2. Tune to the station you want to
AUTOMATIC TUNING
MEMORY
store, then press
.
appears.
You can use automatic tuning to skip
to the next available station in your ar-
ea.
MEM-
show location of MEMORY
AUTO SCAN
Press
. The tuner auto-
matically searches up the band and
stops when it finds the next active sta-
tion.
3. To store stations into memory lo-
cations 1–5, press a memory loca-
1/6 2/7 3/8 4/9
tion button (
5/
,
,
,
, or
show location of AUTO SCAN
0
). The station is stored,
MEM-
disappears, and the display
shows the frequency and the
memory location number.
MEMORY TUNING
You can store up to 10 AM and 10 FM
stations in memory.
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.
Note:
seconds. If
before you press a memory loca-
appears for only 3
disappears
MEM-
tion button, start again from Step
2.
AM/FM
1. Set
to the desired band.
To store stations into memory lo-
MEMORY
cations 6–10, press
,
SHIFT
then
, then press a memory
1/6 2/7 3/8 4/9
location button (
,
,
,
, or
5/0
).
disappears, and the
display shows the frequency and
the memory location number.
12
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13-1296.fm Page 13 Wednesday, July 14, 1999 7:16 PM
Note: This increases the memory
location number by 5. For exam-
MEMORY
, then
, the radio stores
ple, if you press
SHIFT 5/0
, then
the selected frequency into mem-
ory 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 stations 6–10,
SHIFT
press
, then press the desired
memory location button.
13
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13-1296.fm Page 14 Wednesday, July 14, 1999 7:16 PM
CD PLAYER OPERATION
Notes:
• Track number 00and the current
LOADING A CD
1. Set TAPE/TUNER/CD to CD.
tray number appear while the sys-
tem checks each tray.
2. Press OPEN/CLOSE to open the
CD compartment.
• If the system finds an empty tray,
the tray number disappears and
the system checks the next tray.
• If the system finds a tray with a
CD, the tray number and the num-
ber of tracks on that CD appear.
show location of OPEN/CLOSE
Note: The CD carousel has three
trays, each labeled with numbers,
but only two trays show at a time
when you open the CD compart-
ment.
show display - disc 3, 10 tracks
3. Place a CD in either (or both) of
the exposed trays, label side up.
SELECTING A CD
To load a CD in the third tray,
press DISC SKIP. The carousel ro-
tates, exposing the other tray.
To select a CD, press DISC SKIP be-
fore or during play.
If the system is playing a CD, it stops
playing it and begins playing the first
track of the selected CD.
show location of DISC SKIP
4. After you load the CDs, press
OPEN/CLOSE to close the CD
compartment. The system dis-
plays the current tray number, and
the number of tracks on that CD.
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4. The system plays all the loaded
CDs once, then stops. To stop
PLAYING A CD
STOP
play sooner, press
.
After loading a CD, follow these steps
to play it.
PLAY/PAUSE
1. Press
.
show STOP location
show PLAY/PAUSE location
The CD in the current tray begins
to play from Track 1. The system
CHANGING CDs DURING
PLAYBACK
displays
, the current tray num-
ber, and the CD’s current track
number.
To open the disc tray without stopping
OPEN/CLOSE
playback, press
on the
CD changer. The tray opens and the
current CD continues to play. You can
then change the CDs in the two front
trays.
Notes:
• If a tray does not contain a CD,
no appears. The system skips
that tray and automatically
plays the CD in the next tray.
• 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.
AUTOMATIC SKIP
The automatic skip feature lets you
quickly locate the beginning of any
track on a CD, including the track cur-
rently playing, and search forward or
backward through the tracks. You can
use automatic skip when a CD is play-
ing or stopped.
X-BASS
2. Adjust the volume and set
for the desired sound.
3. To temporarily stop play, press
y
PLAY/PAUSE
.
appears. To
PLAY/
press
resume
play,
PAUSE
again.
show SKIP locations
15
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13-1296.fm Page 16 Wednesday, July 14, 1999 7:16 PM
If a CD is playing:
RANDOM PLAY
• Press SKIP
the beginning of the next track.
once to skip to
This feature randomly selects and
plays tracks from all loaded CDs.
• Press SKIP once to skip back
to the beginning of the current
track.
To randomly select tracks from
only one or two CDs, you must load
only those CDs in the CD tray.
Note:
• Repeatedly press SKIP
to
skip backward or SKIP
forward to the beginning of the de-
sired track.
to skip
1. Press STOP to cancel any other
CD function.
2. Press RANDOM. RANDOM ap-
If the CD is stopped or paused, re-
pears.
peatedly press SKIP
or SKIP
until the system displays the number
of the track you want to play, then
press PLAY/PAUSE
er starts playing the selected track.
. The CD play-
show RANDOM location
AUDIBLE SEARCH
3. Press PLAY/PAUSE. After one
track plays, the system randomly
selects another track and plays it,
continuing until all tracks on all
loaded CDs have played.
Hold down
SEARCH or
SEARCH to search forward or back-
ward during play. The CD plays rapid-
ly and you hear the music at a high
speed and low volume.
Notes:
• To repeat the current track,
press SKIP
. To play the
next random track, press SKIP
show SEARCH locations
.
• To repeat random play, before
the last track ends, press RE-
PEAT until REPEATALL ap-
pears. See “Repeat Play” on
Page 17.
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13-1296.fm Page 17 Wednesday, July 14, 1999 7:16 PM
4. To briefly stop random play, press
To cancel repeat play at any time, re-
peatedly press REPEAT until REPEAT
disappears.
y
y
PLAY/PAUSE
.
appears. To
resume play, press it again.
5. To stop random play, press STOP
then RANDOM. RANDOM disap-
pears.
PROGRAMMED PLAY
You can program up to 32 selections
(tracks or CDs) from any loaded CDs
to play in any order you choose.
REPEAT PLAY
You can repeat a single track on a se-
lected CD, all tracks on a selected CD,
all tracks on all loaded CDs, or a
programmed sequence (see Pro-
grammed Play”).
Programming and Playing a
Sequence of Tracks
1. Press
STOP to cancel any other
CD function.
2. Press PROGRAM. You see:
show REPEAT location
show display with
flashing –’s
To repeat a single track, press RE-
PEAT once while the desired track is
playing. REPEATONE appears, and
the CD player continuously replays
the track.
3. Press DISC SKIP to select the CD
containing the tracks you want to
store. The disc number appears.
4. Press SKIP
or SKIP
to
select the track number you want
to store. The selected track num-
ber appears.
To repeat all tracks on a selected CD,
press DISC SKIP to select the desired
CD. Then repeatedly press REPEAT
until REPEATONEDISCappears.
Or, press PROGRAM twice to store
the entire CD as one selection. AL
(all) appears.
To repeat all tracks on all loaded CDs,
repeatedly press REPEAT until RE-
PEATALLDISCappears.
5. Press PROGRAM to store the
track. The display returns to the
blank program selection screen.
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13-1296.fm Page 18 Wednesday, July 14, 1999 7:16 PM
GRAM
6. Repeat Steps 3–5 to program
more selections. The display
shows how many selections you
have stored.
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 previ-
ous selection.
Note: You cannot store more than
32 selections. Any track or CD
stored after the 32nd selection re-
places that track or CD.
• To add a selection while play is
stopped, press
PROGRAM
once
so the blank program selection
display appears. Then repeat
Steps 3–5 to select and store the
new selection. The new selection
is added to the end of the pro-
grammed sequence.
PLAY/PAUSE
7. Press
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 pro-
grammed track. To stop the CD
player at any time during pro-
Reviewing the Programmed
Sequence
STOP
grammed play, press
.
The last programmed CD’s num-
ber and number of tracks appear.
While play is stopped, repeatedly
PROGRAM
press
to review the pro-
grammed sequence. You see the se-
lection number and the track’s
sequence number.
Notes:
• You can use
and
SKIP
SEARCH
SKIP
or
or
to move between selec-
SEARCH
tions during programmed play.
Erasing the Programmed
Sequence
• You cannot use random play dur-
ing programmed play.
To erase the entire programmed se-
• To repeat a programmed se-
STOP
quence, press
twice. PRO-
REPEAT
quence, press
until RE-
GRAMdisappears and the current tray
number and the total number of tracks
appear. You can also erase the pro-
PEAT ALL appears. The CD
player continuously replays the
programmed sequence.
TAPE/
grammed sequence by sliding
TUNER/CD TAPE TUNER
to
or
, or by
DISC SKIP
• Pressing
has no effect
OPEN/CLOSE
pressing
.
while a programmed sequence
plays.
• To replace a selection while play
PRO-
is stopped, repeatedly press
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13-1296.fm Page 19 Wednesday, July 14, 1999 7:16 PM
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 anything 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-la-
bel side).
• Do not store CDs in high-
temperature, high-humidity loca-
tions. The CDs 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 not in use. Finger-
prints 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).
19
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13-1296.fm Page 20 Wednesday, July 14, 1999 7:16 PM
CASSETTE DECK OPERATION
The system has two cassette decks.
You can use both for normal playback
and consecutive play, and you can
also use Deck 1 for dubbing (record-
ing).
2. Press STOP/EJECT
to open
the cassette compartment door.
show STOP/EJECT location
Both Deck 1 (1 RECORD/PLAY-
BACK) and Deck 2 (PLAYBACK 2)
have a full-release auto-stop system
to protect tapes and prevent pinch roll-
er damage. When a tape reaches the
end of a side, the tape mechanism au-
tomatically stops and releases the
tape.
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 fac-
ing you, and its full reel to the left.
4. Gently close the compartment
door.
LOADING A CASSETTE
TAPE
PLAYING A CASSETTE
TAPE
Follow these steps to load a cassette
tape in either Deck 1 or Deck 2.
After loading a cassette tape, follow
these steps to play it.
Note: Use the control buttons under
the same deck where you loaded the
tape.
1. Set TAPE/TUNER/CD to TAPE.
1. Take up any slack in the tape by
turning the cassette’s hub with a
pencil. If you do not remove ex-
cess slack, the tape might be-
come tangled in the record/
2. Press PLAY . The tape plays un-
til it reaches the end of the side,
then it automatically stops.
playback
touching the tape.
mechanism.
Avoid
show PLAY location
show pencil in cassette hub
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13-1296.fm Page 21 Wednesday, July 14, 1999 7:16 PM
Notes:
USING CONSECUTIVE
PLAY
• To temporarily stop playback,
y
PAUSE
PAUSE
press
. Press
y
again to continue playback.
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.
show PAUSE location
1. Load the cassette you want to
hear first in Deck 2 and the sec-
ond cassette in Deck 1.
PLAY
2. Press
on Deck 2. The cas-
• To fast-forward or rewind the
sette in Deck 2 plays.
STOP/EJECT
tape, press
then press
,
FAST-F
RE-
or
3. While the cassette in Deck 2 is
WIND
.
PAUSE
PLAY
then
playing, press
on Deck 1.
The tape in Deck 2 plays until it reach-
es the end of the side. Then Deck 1
plays until the tape reaches the end of
the side.
show FAST-F and
REWIND location
• To stop fast-forward or rewind,
STOP/EJECT
press
.
RECORDING ON A
CASSETTE
STE-
3. Adjust the volume and set
REO WIDE
X-BASS
for the de-
and
sired sound.
You can record from the CD player or
tuner to a cassette in Deck 1, or dub
(copy) from a cassette in Deck 2 to a
cassette in Deck 1.
4. To manually stop play, press
STOP/EJECT
.
To open the cassette compart-
STOP/EJECT
ment, press
Caution: If you use a cassette tape
while the cassette player is
stopped.
with the erase-protection tabs re-
RECORD
moved, do not force down
.
This can damage the recording mech-
anism. See “Preventing Accidental
Erasure” on Page 24.
21
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13-1296.fm Page 22 Wednesday, July 14, 1999 7:16 PM
Notes:
To record at twice the normal re-
DUBBING
cording speed, set
HIGH
to
• Tape quality greatly affects the
quality of the recording. We rec-
ommend regular length (60- or 90-
minute) cassette tapes. For low-
noise, wide-range recordings, use
normal-bias tape.
.
Note: High speed dubbing pro-
duces a slightly lower quality re-
cording.
PAUSE
RECORD
and
4. On Deck 1, press
RECORD PLAY
then
X-
• The recording level is preset.
.
BASS STEREO WIDE VOL-
,
, and
lock down.
UME
have no effect on the record-
PLAY
5. On Deck 2, press
. Deck 1
ing level or quality.
PAUSE
automatically releases
,
and the system copies the tape in
Deck 2 onto the tape in Deck 1.
Dubbing (Copying) Cassette
Tapes
Notes:
• To monitor the tape while it is
You can copy from one cassette tape
to another at normal or high speed,
and you can monitor the tape as you
dub it.
VOLUME
copying, adjust
to a
comfortable listening level.
• If you monitor the tape while
dubbing at high speed, the
sound is distorted.
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.
STOP/
6. To stop copying, press
EJECT
on Deck 1 and Deck
2.
2. Load the cassette you want to
copy from into 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 con-
tinues to record or play.
3. To record at normal speed, set
DUBBING
NORM
.
to
show DUBBING set to NORM
22
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13-1296.fm Page 23 Wednesday, July 14, 1999 7:16 PM
3. Set TAPE/TUNER/CD to TUNER.
Recording from a CD
4. Select the desired station, then
1. Load a blank cassette tape, or
one you want to record over, into
Deck 1.
press PAUSE
on Deck 1 to re-
lease it and start recording. The
system records on the cassette
until it reaches the end of the side,
then the cassette deck automati-
cally stops.
2. Press PAUSE
then RECORD
.
PLAY
and RECORD lock
down.
3. Set TAPE/TUNER/CD to CD.
Notes:
4. Load the desired CDs in the CD
player.
• To temporarily stop recording,
press PAUSE . Press PAUSE
again to resume recording.
5. Select the desired CD track or
program a sequence (if you do not
want to record an entire CD in or-
der).
• If you record broadcasts from
AM radio, you might hear a low-
volume hum when you play
back the recording. If this oc-
curs, set BEAT CUT to the other
position and try again.
Hint: To copy a CD’s tracks in ran-
dom sequence, press RANDOM so
RANDOMappears.
6. Press both PAUSE
on Deck 1
on the CD
and PLAY/PAUSE
player. Recording starts when
PAUSE releases.
Beat Cut location
7. To stop recording before it auto-
matically stops, press STOP
the CD player, then press STOP/
EJECT
on Deck 1.
on
5. To stop recording before it auto-
matically stops, press STOP/
EJECT
on Deck 1.
Recording from the Tuner
1. Load a blank cassette tape, or
one you want to record over, into
Deck 1.
2. Press PAUSE
then RECORD
.
PLAY
and RECORD lock
down.
23
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13-1296.fm Page 24 Wednesday, July 14, 1999 7:16 PM
Erasing a Cassette Tape
TAPE TIPS
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
playing.
Preventing Accidental
Erasure
Cassette tapes have two erase-
protection tabs
one for each side.
æ
To protect a recording from being ac-
cidentally recorded over or erased,
use a screwdriver to remove one or
both of the cassette tape’s erase-
protection tabs.
You can quickly erase both sides of a
cassette tape using a bulk tape eraser
(such as Cat. No. 44-232, not sup-
plied), available at your local Ra-
dioShack store.
Restoring Tape Tension and
Sound Quality
show Side A erase protection tab
being removed with a screwdriver
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.
If you want to record on a tape side af-
ter you have removed the erase-
protection tab, place a piece of strong
plastic tape over that side’s erase-
protection hole.
To restore the sound quality, fast-
forward the tape from the beginning to
the end of one side, then completely
rewind it. Then loosen the tape reels
by gently tapping each side of the cas-
sette’s outer shell on a flat surface.
Notes:
• Be sure you cover only the hole
originally covered by the erase-
protection tab.
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.
• Removing the erase-protection
tabs does not prevent a bulk
eraser from erasing a cassette
tape.
24
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13-1296.fm Page 25 Wednesday, July 14, 1999 7:16 PM
CARE AND MAINTENANCE
Your Optimus System 748 Mini Stereo Component System is an example of supe-
rior design and craftsmanship. The following suggestions will help you care for the
system so you can enjoy it for years.
Keep the system dry. If it gets wet, wipe it dry immediately. Liquids
might contain minerals that can corrode the electronic circuits.
Handle the system gently and carefully. Dropping it can damage cir-
cuit boards and cases and can cause the system to work improperly.
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 prema-
ture 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 deter-
gents 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 authoriza-
tion to operate it. If your system is not performing as it should, take it to your local
RadioShack store for assistance.
25
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13-1296.fm Page 26 Wednesday, July 14, 1999 7:16 PM
Deck 2
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 op-
eration. Your local RadioShack store
sells a wide selection of cassette deck
cleaning supplies.
5. When you finish cleaning, press
STOP/EJECT
on both decks,
close the cassette compartment
doors, and reconnect power.
1. Disconnect power.
RESETTING THE
SYSTEM
2. Open the cassette compartment
doors.
PLAY
3. Press
on both decks to
If the system does not operate proper-
ly and you are not sure why, unplug
the AC power cord for about 5 minutes
to reset the system. Then plug it in
again.
expose the tape-handling parts.
4. Use a cotton swab dipped in de-
natured alcohol or tape head
cleaning solution to clean the
record/play heads, pinch rollers,
capstans, tape guides, and erase
head.
Deck 1
26
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13-1296.fm Page 27 Wednesday, July 14, 1999 7:16 PM
SPECIFICATIONS
Cassette
Tape Speed ........................................................................... 17/8 ips (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 (±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
Quantization 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) ......................................... 1113/16 × 87/8 × 913/16 Inches
(300 × 225 × 250 mm)
Speaker Size .............................................................................................. 6 Inches
Speaker Impedance .................................................................................... 4 Ohms
Dimensions of Unit (HWD) .......................................... 1113/16 × 113/8 × 145/8 Inches
(300 × 288 × 372 mm)
Weight .................................................................................................... 27 lbs 5 oz
(12.4 kg)
Specifications are typical; individual units might vary. Specifications are subject to
change and improvement without notice.
27
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13-1296.fm Page 28 Wednesday, July 14, 1999 7:16 PM
Limited Ninety-Day Warranty
This product is warranted by RadioShack against manufacturing defects in material and workman-
ship under normal use for ninety (90) days from the date of purchase from RadioShack company-
owned stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED
HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES,
INCLUDING THOSE OF MERCHANTABILITY AND 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 HAVE NO LIABIL-
ITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RE-
SPECT 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 WAR-
RANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVE-
NIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN AD-
VISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of in-
cidental or consequential damages, so the above limitations or exclusions may not apply to you.
In the event of a product defect during the warranty period, take the product and the RadioShack
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, un-
less otherwise provided by law: (a) correct the defect by product repair without charge for parts and
labor; (b) replace the product with one of the same or similar design; or (c) refund the purchase
price. All replaced parts and products, and products on which a refund is made, become the prop-
erty of RadioShack. New or reconditioned parts and products may be used in the performance of
warranty service. Repaired or replaced parts and products are warranted for the 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, improper or abnormal usage, failure to follow instructions, improper installation or
maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs
other than those provided by a RadioShack Authorized Service Facility; (c) consumables such as
fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs
of product removal, installation, set-up service adjustment or reinstallation.
This warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
RadioShack Customer Relations, Dept. W, 100 Throckmorton St., Suite 600, Fort Worth, TX 76102
We Service What We Sell
3/97
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
7A7
Printed in Hong Kong
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