Owner’s Manual
Please read before using this equipment.
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ˆ Contents
Features ................................................................................................................... 3
Preparation .............................................................................................................. 4
Presetting the Controls ....................................................................................... 4
Choosing a Location ........................................................................................... 4
Placing the Speakers .......................................................................................... 4
Making Connections ............................................................................................... 5
Speakers .................................................................................................................. 6
Speaker Phasing ................................................................................................ 6
Determining Total Speaker Impedance .............................................................. 6
Connecting Speakers ......................................................................................... 7
One Speaker ................................................................................................ 8
Two or More Speakers Without Transformers ............................................. 8
Multiple Speakers with Transformers ......................................................... 10
Controls and Operation ........................................................................................ 12
Troubleshooting .................................................................................................... 13
Care ........................................................................................................................ 14
Replacing the Fuse ........................................................................................... 14
Specifications ........................................................................................................ 15
© 2000 Tandy Corporation.
All Rights Reserved.
RadioShack and RadioShack.com are trademarks used by Tandy Corporation.
2
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ˆ Features
Your RadioShack MPA-50 40-Watt PA
Amplifier gives you 40 watts of solid
power for your public address (PA) sys-
tem. The built-in three-band equalizer
enables you to tailor the sound to fit your
environment. Its wide frequency re-
sponse easily handles amplification of
voice and music.
Your amplifier is ETL listed to UL stan-
dards and meets all applicable FCC
standards.
WARNING: To reduce the risk of fire or
shock hazard, do not expose this product to
rain or moisture.
CAUTION
Its other features include:
RISK OF ELECTRIC
!
SHOCK. DO NOT OPEN.
Built-In Mixer and Preamplifier — pro-
duce the best output possible, even with
low-level audio input.
CAUTION: TO REDUCE THE RISK
OF ELECTRIC SHOCK, DO NOT
REMOVE COVER OR BACK. NO USER-
SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSON-
NEL.
Microphone Jacks — let you connect
up to two high- or low-impedance micro-
phones.
This symbol is intended to
alert you to the presence of
uninsulated dangerous voltage
within the product’s enclosure
that might be of sufficient mag-
nitude to constitute a risk of
electric shock. Do not open
the product’s case.
Input Jacks — let you connect auxiliary
equipment, such as a CD player, tape
deck, or receiver, for music and special
effects.
Spring-Loaded Terminals — make
speaker connection easy.
Master Volume Control — lets you ad-
just the overall sound level.
This symbol is intended to
inform you that important oper-
ating and maintenance instruc-
!
tions are included in the
literature accompanying this
product.
Individual Microphone Controls — let
you separately adjust the volume of
each microphone.
Auxiliary Volume Control — lets you
adjust the volume of the connected
equipment.
Priority Terminals — let you connect
an optional switch to cut out all other au-
dio input sources and give priority to
only the MICROPHONE 1 input.
Features
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ˆ Preparation
Notes:
• Place the speakers so they are
PRESETTING THE
CONTROLS
mounted slightly above the listeners’
heads and pointed toward them.
Warning: A sudden high output from the
amplifier could damage your hearing or
the speakers connected to the amplifi-
er’s output.
• When using more than one speaker,
overlap the projection areas of the
speakers to prevent “dead” spots.
To avoid accidentally overdriving a
channel or prematurely amplifying an
audio input, set all the amplifier’s front-
panel controls to their lowest settings.
To avoid sudden audio from the input
sources, be sure all audio devices are
turned off before you connect them to
the amplifier.
CHOOSING A LOCATION
Choose a location with adequate venti-
lation. Do not place the amplifier on thick
carpeting or cushions (which can restrict
the air flow) or near a heat source, such
as a heat vent or radiator (which can
cause the amplifier to overheat).
PLACING THE SPEAKERS
Speaker placement depends on your
room’s size and arrangement. We rec-
ommend you play a wide-range record-
ing and experiment with speaker
placement until you find the locations
that result in the best sound.
4
Preparation
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ˆ Making Connections
Important: Connect all auxiliary equipment and speakers before connecting power.
PHONO L (Left) and R (Right) Input
Jacks — Connect a turntable with a
magnetic cartridge. To avoid distortion,
do not connect a high-level audio input
source to these jacks. Even though the
amplifier has L and R input jacks, the
output from the amplifier is monaural.
PHONO/AUX/CD Switch — Select the
input source. Even if you connected
auxiliary equipment to both the PHONO
and AUX/CD input jacks, you can use
only one source at a time.
Speaker Push Terminals — Press the
appropriate tab to open a terminal. In-
sert the end of a speaker wire into the
opening, then release the tab to close
the terminal and secure the wire (see
“Connecting Speakers” on Page 7).
AUX/CD L and R Input Jacks — Con-
nect any high-level sound source (such
as a tape deck, CD player, receiver, or a
turntable with a ceramic or crystal car-
tridge). To connect a stereo source, use
shielded audio cable (available at your
local RadioShack store); however, the
amplifier’s output is monaural.
PRIORITY Terminals — To allow MI-
CROPHONE 1 to override all other inputs,
connect an SPST (single-pole, single-
throw) switch to the amplifier’s PRIORITY
terminals using normal two-conductor
wire (switches and wire are available at
your local RadioShack store). Refer to
the switch’s manual for connection and
usage instructions.
GROUND Screw
—
Connect the
ground wire (usually black or green)
from your turntable to this screw to avoid
a low-frequency hum. You can also use
this screw to ground any other system
connection.
AC Power Cord — To use AC power,
plug this cord into an AC outlet.
Making Connections
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ˆ Speakers
minal that does not have the wire
attached to it.
SPEAKER PHASING
Phasing is the direction the speaker
cone moves with reference to the polari-
ty of the connection wires. Proper phas-
ing is important when you use more than
one speaker in the same room or area.
Out-of-phase speakers can lose up to
one-half of their potential volume, and
can have a significantly decreased bass
effect.
4. Touch the negative end of the bat-
tery with the lose end of the wire
attached to the other speaker termi-
nal. Note the direction of the cone
movement — inward or outward.
5. If the speaker cone moves outward,
the speaker terminal where you
touched the positive end of the bat-
tery is positive. Mark that terminal
with a + and mark the other terminal
with a –.
Speakers are in phase if all the speaker
cones move in the same direction when
an equal signal is applied. Phasing is
correct if you observe the correct polari-
ty (+ to + and – to –) when connecting
the speakers.
If the speaker cone moves inward,
the speaker terminal with the wire
attached that touched the negative
end of the battery is positive. Mark
that terminal with a + and mark the
other terminal with a –.
Most speaker terminals are color-coded
or have a mark that indicates the termi-
nal’s polarity. Usually, terminals with
positive polarity are red or have a plus
symbol (+), and terminals with negative
polarity are black or have a minus sym-
bol (–). If the speaker terminals are un-
marked, follow these steps to determine
their polarity.
6. Remove the wire.
Repeat Steps 2–6 for each speaker with
unmarked terminals you plan to connect
to the amplifier.
DETERMINING TOTAL
SPEAKER IMPEDANCE
1. Remove about 1 inch of insulation
from both ends of a short piece of
wire (available at your local
RadioShack store). Then twist the
exposed wire to secure all its
strands.
Caution: A total speaker impedance
that is higher than 16 ohms (Ω) or lower
than 4 ohms can damage your amplifier
or speakers. Be sure to make the proper
connections.
2. Connect one end of the wire to one
of the speaker terminals.
Before you connect speakers to the am-
plifier, you must determine the total
speaker impedance. In determining the
total speaker impedance, you must first
3. Touch the positive end of a 1.5-volt
flashlight battery to the speaker ter-
6
Speakers
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32-2002.fm Page 7 Friday, February 11, 2000 11:36 AM
determine if your speakers are connect-
ed in series, parallel, or series/parallel
combined.
mum impedance (16 ohms) or fall
below its minimum impedance (4
ohms).
Note: We recommend that you use
speakers that are rated the same (for
example, all 8-ohm speakers) for all se-
ries or parallel connections.
For example, if you connect four 8-
ohm speakers:
–In series, the total impedance is 32
ohms (8 + 8 + 8 + 8 = 32). This
exceeds the maximum rating.
• Speakers are connected in series
when the first speaker’s positive ter-
minal is connected to the next
speaker’s negative terminal. Deter-
mine the total impedance of speak-
ers connected in series by adding
up the individual impedances of all
the connected speakers.
–In parallel, the total impedance is 2
ohms (8 ÷ 4 = 2). This falls below
the minimum rating.
You can arrive at a proper total
impedance by combining series and
parallel connections.
For example, if you want to connect
two 8-ohm speakers in series, add 8
(the impedance of one speaker)
plus 8 (the impedance of the other
speaker) for a total speaker imped-
ance of 16 ohms.
CONNECTING SPEAKERS
You need speakers and wire (available
at your local RadioShack store) to com-
plete the connections to your amplifier.
Be sure to use 16-gauge wire or heavi-
er. (The smaller the gauge number, the
heavier the wire.)
• Speakers are connected in parallel
when all their negative terminals are
connected together and all their
positive terminals are connected
together. For speakers rated the
same, find the total impedance of
speakers connected in parallel by
dividing the impedance of one
speaker by the number of speakers.
Remove about 1 inch of insulation from
both ends of each wire. Then twist the
exposed wire to secure all its strands.
Connect the speaker wire to the amplifi-
er by pressing down on the appropriate
push terminal tab and inserting the end
of the twisted wire into the terminal’s
hole. Then release the tab to secure the
wire.
For example, if you want to connect
two 8-ohm speakers in parallel,
divide 8 (the impedance of one
speaker) by 2 (the number of speak-
ers) for a total speaker impedance
of 4 ohms.
You can connect one or more 4-, 8-, or
16-ohm speakers, with or without trans-
formers, between the amplifier’s output
and the speakers’ input. To ensure
equal volume from each speaker, all the
connected speakers should have the
same impedance rating.
• If you connect more than two speak-
ers using only series or only parallel
connections, the total impedance
might exceed the amplifier’s maxi-
Speakers
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Speakers in Series
One Speaker
8Ω Speaker
Connect the speaker’s negative (–) ter-
minal to the amplifier’s COM (common)
terminal. Then connect the speaker’s
positive (+) terminal to the amplifier’s
terminal that matches the speaker’s im-
pedance. For example, if you have an 8-
ohm speaker, connect the speaker’s
positive terminal to the amplifier’s 8-ohm
terminal.
Two 8Ω Speakers
1. To determine the total impedance of
speakers connected in series, add
the impedance of all the speakers.
For example, if you want to connect
two 8-ohm speakers in series, add 8
(the impedance of one speaker)
plus 8 (the impedance of the other
speaker) for a total speaker imped-
ance of 16 ohms.
Two or More Speakers Without
Transformers
We recommend connections without
transformers if the length of the connect-
ing wires between the amplifier and the
speakers is 50 feet or less.
2. Connect the first speaker’s positive
(+) terminal to the second speaker’s
negative (–) terminal.
When making connections without
transformers, all the speakers must
have the same impedance rating to en-
sure equal volume from each speaker.
When there is more than one speaker in
a sound system, you must determine the
total impedance of the speakers before
you can make the correct connection.
The total impedance of all the speakers
must match one of the amplifier’s output
terminals (4Ω, 8Ω, or 16Ω).
3. Connect the first speaker’s nega-
tive (–) terminal to the amplifier’s
COM terminal.
4. Connect the second speaker’s posi-
tive (+) terminal to the amplifier’s
terminal that matches the total
speaker impedance (16Ω, in this
example).
8
Speakers
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Speakers in Parallel
Series and Parallel Combined
Two 8Ω Speakers
Four 8Ω Speakers
1. To determine the total impedance of
speakers connected in parallel,
divide the impedance of one
speaker by the number of speakers.
If you must hook up more than two
speakers, you might have to use a com-
bination of series and parallel connec-
tions to get a total impedance that
matches one of the amplifier’s terminals.
For example, if you want to connect
two 8-ohm speakers in parallel,
divide 8 (the impedance of one
speaker) by 2 (the number of speak-
ers) for a total speaker impedance
of 4 ohms.
If you connect four 8-ohm speakers in
series, the total impedance is 32 ohms
(8 + 8 + 8 + 8 = 32). This exceeds the
maximum rating.
If you connect these speakers in paral-
lel, the total impedance is 2 ohms (8 ÷ 4
= 2). This falls below the minimum rat-
ing.
2. Connect the speakers’ negative (–)
terminals together.
3. Connect the speakers’ positive (+)
terminals together.
You can arrive at a proper total imped-
ance by combining series and parallel
connections.
4. Connect the speakers’ negative (–)
terminals to the amplifier’s COM ter-
minal.
1. Group speakers into pairs.
5. Connect the speakers’ positive (+)
terminals to the amplifier’s terminal
that matches the total speaker
impedance (4Ω, in this example).
2. Connect each pair of speakers in
series.
For example, the total impedance of
each pair of 8-ohm speakers is 16
ohms (8 + 8 = 16).
3. Connect the pairs of speakers in
parallel.
Speakers
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4. To determine the total impedance of
speakers connected in serial and
parallel combined, divide the imped-
ance of one pair of speakers by the
number of pairs.
• You can add or remove a speaker
without having to recalculate the
entire system’s impedance.
• You can reduce signal loss when
you use speaker wire over 50 feet
long.
For example, if you want to connect
four 8-ohm speakers in serial and
parallel combined, divide 16 (the
impedance of one pair of speakers)
by 2 (the number of speaker pairs)
for a total speaker impedance of 8
ohms.
You need a separate transformer for
each speaker.
Line transformers have several connec-
tors called taps.
5. Connect the negative (–) terminals
of all pairs of speakers to the ampli-
fier’s COM terminal.
6. Connect the positive (+) terminals of
all pairs of speakers to the ampli-
fier’s terminal that matches the total
speaker impedance (8Ω, in this
example).
Taps
Multiple Speakers with
Transformers
The primary taps (on one side of the
transformer) are the inputs and are rated
in watts. The secondary taps (on the op-
posite side of the transformer) are the
outputs and are rated in ohms.
For complex multiple-speaker arrange-
ments that require many speakers and
long runs of connecting wire, we recom-
mend you use a line transformer (not
supplied).
Note: When running lengths of wire
longer than 50 feet, use wire that is
heavier than 16 gauge.
Primary
Taps
Secondary
Taps
There are several advantages to using
transformers.
• You can connect speakers with dif-
ferent impedances without causing
differences in output between the
speakers.
10
Speakers
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Cautions:
• Before you connect the speakers, be sure the total wattage of the primary taps
you intend to use does not exceed the amplifier’s maximum 40-watt output power
rating.
• Avoid multiple connections to the amplifier’s 70V and COM terminals.
Follow these steps to make the connections.
1. Connect a wire from the amplifier’s 70V terminal to each transformer’s primary
tap that matches your speaker’s wattage rating. For example, if you will be con-
necting a 2.5-watt speaker to a transformer, connect this wire to the 2.5 tap on
that transformer’s primary side.
2. Connect a wire from the amplifier’s COM terminal to the COM tap on each trans-
former’s primary side.
3. Connect a wire from the speaker’s positive (+) terminal to each transformer’s
secondary tap that matches the speaker’s total impedance (4, 8, or 16 Ω). For
example, if you are connecting an 8-ohm speaker to a transformer, connect this
wire to the 8 tap on that transformer’s secondary side.
4. Connect a wire from the speaker’s negative (–) terminal to the COM tap on each
transformer’s secondary side.
Speakers
11
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ˆ Controls and Operation
MICROPHONE 1 and 2 Inputs — Con-
nect any standard dynamic microphone
with a 1/4-inch plug.
150Hz Equalizer Control — controls
output for instruments in this very low
range (such as an organ or a contrabas-
soon). Too much bass makes music
sound muddy and boomy, while too little
makes it sound hollow and thin. Rotate
the knob clockwise to enhance bass
sounds or counterclockwise to reduce
rumble, acoustic feedback, and other
low-frequency disturbances.
POWER Switch and Indicator — Press
the bottom half of the switch to turn on
the amplifier. The indicator lights. Press
the top half of the switch to turn off the
amplifier. The indicator goes off.
MASTER VOLUME Control — Controls
the overall loudness level of all sources.
With the amplifier and the audio input
source turned on (and set to play, if
needed), set this control to its mid-range
setting (5). Adjust this control again after
adjusting the source mixing controls.
1kHz Equalizer Control — controls the
midrange frequencies (voice and instru-
ments). Rotate the knob clockwise to
bring the vocalist “up front,” or counter-
clockwise to move the singer “back” into
the sound mix.
Caution: Do not raise the volume level
too high. Doing so might overload the
system.
6kHz Equalizer Control — controls
high frequencies, such as those gener-
ated by cymbals, and can also act as a
high-frequency noise filter. Rotate the
knob clockwise to increase high fre-
quencies, or counterclockwise if the
sound becomes overbearingly harsh
and strident.
MIC1 and MIC2 Source Mixing Con-
trols — Adjust the input level for each
microphone to get the proper volume
and balance.
PHONO/AUX Source Mixing Control
— Adjusts the input level of the PHONO
or AUX/CD sound source for the best
volume and balance.
12
Controls and Operation
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ˆ Troubleshooting
If you should run into difficulties, check
the wiring of the system. Are there any
short circuits in the speaker wiring?
Have you provided adequate ventila-
tion? Did you calculate speaker imped-
ance correctly?
Be sure microphones and connecting
cables are not defective.
Be sure you are using large enough
speaker wire. You should always use
16-gauge (or larger) wire. The longer the
run of speaker wire, the heavier the
gauge should be.
If you have feedback problems, reposi-
tion your microphones and speakers, or
adjust MASTER VOLUME to a lower set-
ting.
If the amplifier does not work at all,
check the fuse on the rear panel. If it is
blown, replace it with one of the same
size and type (see “Replacing the Fuse”
on Page 14).
If you cannot solve the problem, contact
your local RadioShack store for assis-
tance.
Troubleshooting
13
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ˆ Care
To enjoy your MPA-50 40-Watt PA Am-
terclockwise until the fuse holder
pops out.
plifier for a long time:
• Keep the amplifier dry. If it gets wet,
wipe it dry immediately.
3. Remove the fuse holder and replace
the fuse.
• Use and store the amplifier only in
normal temperature environments.
4. Slide the fuse holder back in place
then, using a flat-blade screwdriver,
push and turn the fuse holder’s cap
fully clockwise to secure it.
• Handle the amplifier gently and
carefully. Don’t drop it.
• Keep the amplifier away from dust
and dirt.
• Wipe the amplifier with a damp cloth
occasionally to keep it looking new.
Modifying or tampering with the amplifi-
er’s internal components can cause a
malfunction and invalidate its warranty.
If your amplifier is not performing as it
should, take it to your local RadioShack
store for assistance.
REPLACING THE FUSE
The power fuse protects your amplifier
from power (voltage or current) surges
when operating it from an AC power
source. If the POWER indicator does not
light when you press POWER, check the
fuse and replace it with one of the same
size and type. (A spare fuse is included.)
Follow these steps to replace the ampli-
fier’s fuse.
1. Unplug the amplifier’s power cord.
2. Using a flat-blade screwdriver, push
and turn the fuse holder’s cap coun-
14
Care
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ˆ Specifications
Output Power at 1 kHz, 10% THD ............................................................................... 40 Watts
Power Bandwidth at 1W, 10% THD, Auxiliary Input ............................................ 70 Hz–20 kHz
THD at 2W, 1 kHz
MIC1 .............................................................................................................................. 1%
MIC2 .............................................................................................................................. 1%
AUX/CD ......................................................................................................................... 1%
PHONO ......................................................................................................................... 1%
Input Sensitivity at 10% THD, 1 kHz
MIC1 ........................................................................................................................ 2.5 mV
MIC2 ........................................................................................................................ 2.5 mV
AUX/CD .................................................................................................................. 150 mV
PHONO ................................................................................................................... 3.5 mV
Signal-to-Noise Ratio
MIC1 .......................................................................................................................... 65 dB
MIC2 .......................................................................................................................... 65 dB
AUX/CD ..................................................................................................................... 70 dB
PHONO ..................................................................................................................... 70 dB
Frequency Response at 8 Ohms, 2W
MIC1 ............................................................................................................. 70 Hz–20 kHz
MIC2 ............................................................................................................. 70 Hz–20 kHz
AUX/CD ........................................................................................................ 70 Hz–20 kHz
PHONO .............................................................................. 100 Hz/12 dB (10 kHz/–13 dB)
Equalizer Control Range at Each Band (Peak Point)
150Hz....................................................................................................................... ±12 dB
1kHz ........................................................................................................................ ±12 dB
6kHz ........................................................................................................................ ±12 dB
Crosstalk from AUX to PHONO ....................................................................... 40 dB (Nominal)
Hum and Noise at 8 Ohms
at Master Volume Minimum ....................................................................... 1 mV (Nominal)
at Master Volume Maximum .................................................................... 50 mV (Nominal)
Priority Terminals ............................................................................................... Normally Open
Power Requirement ........................................................................................... 120V AC 60 Hz
Dimensions (HWD) ......................................... 37/8 × 123/4 × 101/2 Inches (98 × 324 × 267 mm)
Weight ............................................................................................................ 9 lb 10 oz (4.4 kg)
Specifications are typical; individual units might vary. Specifications are subject to change and
improvement without notice.
Specifications
15
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Limited One-Year Warranty
This product is warranted by RadioShack against manufacturing defects in material and workman-
ship under normal use for one (1) year from the date of purchase from RadioShack company-owned
stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, Ra-
dioShack 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 LIABILITY OR RE-
SPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RESPECT TO ANY
LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFOR-
MANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY, IN-
CLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS
OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDEN-
TAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limita-
tion 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 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, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102
We Service What We Sell
12/99
32-2002
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
811081780C
02A00
Printed in China
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