Optimus STA 10 AM FM Stereo Receiver Owners Manual

16 Pages·0.29 MB·English

by  Tandy Corp

OWNER'S MANUAL 'l~bl'h
STA-20
AM/FM STEREO RECEIVER
Please read before using this equipment
lilTED WARRANTY
1r 2 years from date of purchase from Radio
zed Radio Shack franchisees and dealers.
1arge for parts and labor. Simply bring your
ISe date to any Radio Shack store. Warranty
es it cover a product subjected to misuse or
)10 SHACK MAKES NO WARRANTIES,
,RRANTIES OF MERCHANTABILITY AND
E. Some states do not permit limitation or
1e aforesaid limitation(s) or exclusion(s) may
ay also have other rights which vary from state to state.
WHat We Sell
SHACK
r1dy Corporation
Texas 76102
Cat. No. 31-1979
811030550C
CJPTII\tfUSe
Printed in Taiw<'ln
INTRODUCTION NOTES
Your new Optimus STA-20 AM/FM
Stereo Receiver gives you excellent
audio in a small package. It is design
ed so that you can use it with smaller
'I
speaker systems such as our Minimus
7. The STA-20's 5-watt amplifier sec
J
tion and built-in circuit equalization give
you outstanding sound quality for such
a compact system. Your receiver also
has a special EQ switch to help you get
the best possible sound, especially
when you use smaller speakers.
2
FEATURES
TONE Effect (at MIN position): • 5 Watts of Power-drives almost any &
-14 dB at 10 kHz high-efficiency speaker system.
• Front Panel CD/TAPE Input Jack
FM TUNER
lets you quickly hook up a portable CD
The lightning flash with arrowhead
Tuning Range: 88-108 MHz
player or cassette deck.
symbol, within an equilateral triangle,
Sensitivity (IHF, 3%): 7 JLV (22.1 dBP)
is intended to alert the user to the
Signal-to-Noise Ratio: 60 dB • TUNED Indicator-shows you when
presence of uninsulated "dangerous
Stereo Separation at 1 kHz: 35 dB you are receiving the strongest signal
voltage" within the product's
from an FM or AM radio station.
AM TUNER enclosure that may be of sufficient
Tuning Range: 530-1710 kHz • TAPE OUT Jacks - enable you to magnitude to constitute a risk of elec
Sensitivity (IHF, 10%): 450 JLV/m record any one of the amplifier's pro tric shock to persons.
Signal-to-Noise Ratio: 37 dB gram sources.
RF overload: 4%
• EQ Switch - provides you with
RF interference Rejection: Rated &
uniform output at low frequencies for
Excellent
a rich, full sound.
POWER REQUIREMENTS: For your personal records, we urge you The exclamation point within an
to record the serial number of your
120V AC, 60 Hz, 30W. Max. equilateral triangle is intended to alert
receiver in the space provided. You can
(220/240V AC, 50 Hz, 30W. Max. the user to the presence of important
find the serial number on the receiver's
for U.K. and Australian models operating and maintenance (servic
back panel.
available only in U.K./Australia) ing) instructions in the literature ac
companying the appliance.
Serial Number: --------~
CAUTION
WARNING:
RISK OF ELECTRIC SHOCK
DO NOT OPEN TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS
CAUTION: TO REDUCE THE RISK
APPLIANCE TO RAIN OR MOIS
OF ELECTRIC SHOCK, DO NOT.
TURE.
REMOVE COVER (OR BACK). NO
USER SERVICEABLE PARTS IN-
SIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
I
© 1991 Tandy Corporation.
All Rights Reserved.
Radio Shack and Optimus are registered trademarks used by Tandy Corporation.
3
TABLE OF CONTENTS CARE AND MAINTENA
Control Locations· ....................... 5 Operation ................................... ·11
Your receiver is an example of superior
Preparation For Use ···················6 Using the Receiver's Controls · .. ·11 design and craftsmanship. The follow
Connecting Speakers················6 Using the CD/TAPE Input Jack ·12 ing suggestions will help you care for
Positioning Speakers ................ 7 Overload Protection·. 12
00 ••••••••••••••• your receiver so that you can enjoy it for
Connecting Antennas· ............... 7 Thermal Protection·················· .. 12
years.
Care And Maintenance 13
Improving FM Reception ··········8 00 •••••••••••••••
Specifications ............................... 14
Connecting a Turntable ············9 Keep the receiver dry. If it
Connecting a Cassette Deck · · · · · 9 does get wet, wipe it dry
Connecting to AC Power······ ···10 immediately. Liquids can
Typical System Connections··· ··10 contain minerals that can
damage the electronic
circuits.
Use and store the receiver
only in normal temper
ature environments. Ex
treme temperatures can
shorten the life of electronic
devices and distort or meH
plastic parts.
Handle the receiver gently
and carefully. Dropping it
can damage circuit boards
and cases and cause the
receiver to work impro
perly.
Keep the receiver away
from dust and dirt, which
can cause premature wear
of parts.
4
CONTROL LOCATIONS
2. Plug the other end of the audio cable Front Panel:
into your receiver's front panel
CD/TAPE input jack.
FM STEREO Indicator
3. Set the source selector to the
Dial-Pointer Indicator Tuning Control
CD/TAPE position.
OVERLOAD PROTECTION
Your receiver has an overload protec
tion system. If your speaker terminals
receive an unusually high power surge,
this system automatically decreases
the output power to a very low level to
protect your receiver and speakers. PHONES! TONE LOUDNESS
POWER Jack Control Button
If this happens, turn off the power Button l Source Selector
and check all speaker connections. CD/TAPE Input jack VOLUME Control TUNED Indicator
Be sure that there are no stray pieces BALANCE Control
of wire touching between the positive
(+) and negative (-) speaker term
inals. Also check that your speakers
have an impedance rating of at least
8 ohms.
THERMAL PROTECTION
Your receiver also has a thermal
Back Panel:
protection system. If the receiver
overheats, it automatically turns off
PHONO INPUT Jacks SPEAKERS Push Terminals
press [POWER] to the out position, I
TAPE OUT Jacks PHONO GND (ground) Screw
and then check to be sure the receiver's
ventillation holes are unobstructed.
After the receiver cools (about 15
~~;;.';~~·:.~~.:=:..-
'
minutes), press [POWER] in.
Caution: Using speakers with an im
pedance rating less than 8 ohms can
cause the receiver to overheat.
FMANT
TAPE INPUT Jacks (antenna)_
AM ANT (antenna)
300-ohm Screw Terminals
Screw Terminal
FM ANT (antenna) - 75-ohm Screw Terminals
AC Line Cord 5
PREPARATION FOR USE OPERATION
Before making any connections: 2. Split both speaker wires approx USING THE RECEIVER'S
imately four inches on each end. CONTROLS
• Be sure the receiver's power cord is
unplugged. 3. Using a wire stripper, carefully strip 1. Press [POWER] to turn on the
about 1/4 inch of insulation from the
receiver. When the power is on, the
end of each individual wire.
• Be sure the [POWER] button is off. red dial-pointer indicator lights.
Press [POWER] again to turn off the
~
Note: To eliminate or reduce inter power.
ference, use shielded audio cables for
all connections other than speaker 2. Select and prepare the desired pro
connections. gram source as described in the
~
following instructions.
CONNECTING SPEAKERS
Program Sources
Your receiver is designed for use with
AM-Set the source selector to AM.
speakers that have an impedance of 8 4. Connect one of the individual wires
Use the turning control to select the
ohms or higher. To fully enjoy the to the right positive ( +) SPEAKERS
preferred station. When you ac
receiver's capabilities, we recommend push terminal located on the
curately tune to a station, the green
that you use our Minim us series speaker receiver's back panel. Then, connect
TUNED indicator lights.
systems. However, you can also use the other individual wire to the right
any high-efficiency standard speakers negative (-) SPEAKERS push
FM AUTO-Set the source selector
or other types of compact speakers. terminal.
the FM AUTO. Use the tuning control
For speaker connections, use speaker to select the preferred station. When
5. Using the speaker wire's coding as
cable or 1 8-1 6 gauge speaker cable you accurately tune in a station, the
a guide, connect the positive wire to
or two-conductor wire. We recom green TUNED indicator lights.
the positive (+)terminal on your right
mend that you use the shortest length
speaker.
of wire possible. If the station is broadcasting in
Then connect the negative wire to
stereo, the red STEREO indicator
Speaker wire consists of two individual your right speaker's negative (-)
also lights.
wires encased in insulation. Speaker terminal.
wire is usually color-coded or marked
PHONO - Set the source selector to
with a ridge along one side to help you
SpeaKers
PHONO. Put a record on your turn
make the proper connections between
table and adjust the front panel con
your receiver and speakers.
trols for the desired sound. See
"Connecting a Turntable."
1. Cut your speaker wires to the length
needed to connect your speakers to
your receiver.
6
TYPICAL SYSTEM 6. Repeat Steps 4-5 to connect the left CONNECTING ANTENNAS
speaker to the receiver's left
CONNECTIONS
SPEAKERS push terminals. Under most conditions, your receiver's
built-in antennas are adequate for FM
Caution:
AM FM and AM reception. Connect the FM
• Do not use speakers that have an im line-cord antenna to the FM ANT
pedance of less than 8 ohms. 300-ohm screw terminal on the back
panel of your receiver. The built-in AM
• To avoid a short circuit, do not allow antenna requires no attention.
stray wires to touch another terminal.
• Use only the length of wire necessary
to connect the speakers to the
receiver.
POSITIONING
YOUR SPEAKERS
AM ANT
.ii ggggj Placement of your speakers depends FM ANT PHONO GND
largely on the arrangement of your
listening room and the way you listen to
music. Experiment with different
speaker locations to achieve the best
sound.
Stereo speakers should be several feet
apart. Putting them too close together
reduces the stereo effect, while placing
them too far apart reduces the bass
effect and creates a "hole" in the
middle. Speakers usually disperse the
sound at about a 60-degree angle, so
ideally, your listening position should be
in the overlap area. You might want to
angle the speakers toward you for a bet
ter stereo effect.
7
• An outside VHF-TV antenna provides
IMPROVING FM RECEPTION Note: To protect your receiver, use a
excellent FM reception. A "splitter"
lightning arrestor on any outdoor
If you have trouble with the FM recep (available at all Radio Shack stores) antenna.
tion in your area, try one of the ar permits you to connect a TV set and
rangements listed below. your receiver to the same antenna.
CONNECTING A TURNTABLE
Your local Radio Shack store also
,.
• Build the low-cost folded dipole sells a full line of outside antennas to
If your turntable has a magnetic car
antenna illustrated (available at your help you achieve adequate recep
tridge, connect the turntable's output
local Radio Shack store). Attach the tion in fringe areas.
jacks to the receiver's PHONO INPUT
flat cable to the 300-ohm terminals
jacks.
If you use a 300-ohm flat cable, con
on the receiver's back panel. You
nect it to the antenna's 300-ohm ter
can tack the antenna to the back of
minals. If you use a 75-ohm coaxial
a record cabinet or onto a wall.
cable, connect it to the antenna's
Reception is usually best when you
75-ohm terminals. When you use the
attach the antenna at the highest
75-ohm coaxial cable, attach the
possible position.
center wire of the cable to the com
mon terminal between the 75-ohm
and 300-ohm antenna terminals.
Then, connect the braided ground
wire under the clamp as shown
below.
If your turntable has a ceramic or crystal
~artridge, connect the turntable's output
Jacks to the receiver's TAPE INPUT
jacks.
• A set of VHF-TV rabbit ears or anten
nas made specially for FM reception
work well in suburban areas. Connect ,. @rr================
these types of antennas to the 1sn!i,".
300-ohm screw terminals on the
receiver's back panel. IJC:==~I ::
•. Cloa:l
;s=n~~==r~;~~"~a~i~:
Center Wire
8
An outside VHF-TV antenna provides
Note: To protect your receiver, use a If the turntable has a ground wire (usual
excellent FM reception. A "splitter"
lightning arrestor on any outdoor ly black or green), connect it to the
(available at all Radio Shack stores)
• antenna . receiver's PHONO GND screw to
permits you to connect a TV set and reduce or eliminate speaker hum.
your receiver to the same antenna.
CONNECTING A TURNTABLE
Your local Radio Shack store also
CONNECTING A
sells a full line of outside antennas to
If your turntable has a magnetic car CASSETTE DECK
help you achieve adequate recep
tridge, connect the turntable's output
tion in fringe areas.
jacks to the receiver's PHONO INPUT For playback:
jacks.
you use a 300-ohm flat cable, con
Connect your cassette deck's output
ect it to the antenna's 300-ohm ter
jacks to the receiver's TAPE INPUT
linals. If you use a 75-ohm coaxial ~ J jacks. If you want to connect a portable
©
able, connect it to the antenna's
CD or cassette deck, see "Using the
IJ
5-ohm terminals. When you use the
CD/TAPE Input Jack."
5-ohm coaxial cable, attach the
jiNPUTj
enter wire of the cable to the com TAPE OUT TAPE PHONO Note: If you use the front panel
lon terminal between the 75-ohm L@) (@) @)L CD/TAPE input jack, you deactivate the
.nd 300-ohm antenna terminals. back panel TAPE INPUT jacks, and only
·hen, connect the braided ground the CD/TAPE input jack works. To use
11ire under the clamp as shown @ 0 @ the TAPE INPUT jacks, simply unplug
(@ @) @)·
tel ow. your portable CD or cassette player
from the CD/TAPE input jack.
R
For recording:
If your turntable has a ceramic or crystal
Connect your cassette deck's line-in or
cartridge, connect the turntable's output
aux-in input jacks to your receiver's
jacks to the receiver's TAPE INPUT
TAPE OUT jacks.
jacks.
Note: The receiver's TONE, BALANCE,
and VOLUME controls and [LOUD
@
~==============
NESS] button do not affect your
recording.
'JINPUTl
TAPE OUT TAPE PHONO
L@) (@) @)L
Center Wire
@ 0 @
·@@) @)·
9
CONNECTING TO AC POWER TYPICAL SYSTEM 6. Repeat Steps 4-5 to connect the let
speaker to the receiver's lef'
CONNECTIONS
1. Check all connections, especially the SPEAKERS push terminals.
speaker connections, to ensure that
Caution:
they are firm and that there are no AM FM
stray wires. • Do not use speakers that have an im·
pedance of less than 8 ohms.
2. Be sure the [POWER] button is in the
out position. • To avoid a short circuit, do not allow
stray wires to touch another terminal.
3. Set the VOLUME control to MIN.
• Use only the length of wire necessary
to connect the speakers to the
4. Plug the receiver's AC power cord in
receiver.
to a standard AC outlet.
TV
"
:":
POSITIONING
",,
YOUR SPEAKERS
75Q ::
L ll
II
"
!~'= ======~====== -:.-:-1 :======~: Placement of your speakers depend~
largely on the arrangement of yoUI
listening room and the way you listen tc
music. Experiment with differenl
speaker locations to achieve the besl
sound.
Stereo speakers should be several fee1
apart. Putting them too close together
reduces the stereo effect, while placing
them too far apart reduces the bass
effect and creates a "hole" in the
middle. Speakers usually disperse the
·'
sound at about a 60-degree angle, so
ideally, your listening position should be
in the overlap area. You might want to
angle the speakers toward you for a bet·
ter stereo effect.
10