Radio Shack Two Way Radio TRC 488 User Guide

21-1585.fm Page 1 Thursday, August 5, 1999 9:39 AM  
Cat. No. 21-1585A  
OWNER’S MANUAL  
Please read before using this equipment.  
TRC-488  
40-CHANNEL 2-WAY CB RADIO  
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CONTENTS  
Installation ............................................................................................................ 4  
Mounting the TRC-488 .................................................................................... 4  
Mounting the Microphone Holder .................................................................... 5  
Connections ......................................................................................................... 6  
Connecting the Microphone ............................................................................ 6  
Connecting an Optional External Speaker ...................................................... 6  
Connecting Power ........................................................................................... 7  
Using Vehicle Battery Power .................................................................... 7  
Using Standard AC Power ........................................................................ 7  
Installing an Antenna ...................................................................................... 8  
Adjusting the Antenna’s SWR ......................................................................... 9  
Operation ............................................................................................................ 10  
Setting Squelch ............................................................................................. 10  
Using Automatic Noise Limiting .................................................................... 10  
Listening to Weather Broadcasts .................................................................. 10  
Receiving Transmissions on the Channels ................................................... 11  
Transmitting .................................................................................................. 12  
CB Tips ............................................................................................................... 13  
Common Uses for a CB Radio ...................................................................... 13  
Business Uses ........................................................................................ 13  
Personal Uses ........................................................................................ 13  
CB Courtesy .................................................................................................. 13  
Using Common 10-Codes ............................................................................. 14  
Troubleshooting ................................................................................................ 15  
Maximum Range ........................................................................................... 16  
Reducing Noise ............................................................................................. 16  
Maintenance ....................................................................................................... 17  
Replacing the Fuses ..................................................................................... 18  
FCC Information ............................................................................................ 18  
Specifications .................................................................................................... 19  
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INSTALLATION  
Follow these steps to mount the CB  
using the supplied bracket, screws,  
washers, and knobs.  
MOUNTING THE TRC-488  
If you use the TRC-488 as a base sta-  
tion, you can mount it on a desk, shelf,  
or table.  
1. Using the mounting bracket as a  
template, mark the positions for  
the screw holes.  
The most common mounting location  
for the CB is under a vehicle’s dash-  
board. If you use the TRC-488 in a ve-  
hicle, mount it securely to avoid  
damage to the CB or vehicle or injury  
to anyone in the vehicle during sudden  
starts or stops.  
(illus)  
When you mount the CB in a vehicle,  
make sure:  
• You can easily reach the CB.  
2. In each marked location, drill a  
hole slightly smaller than the sup-  
plied screws.  
• Its wires and cables do not inter-  
fere with any of the vehicle’s mov-  
ing parts.  
Caution: Be careful not to drill into  
any objects behind the mounting  
surface.  
• The CB is not directly in front of  
heating vents.  
• All wires and cables reach their  
connection points.  
3. Using  
a
Phillips screwdriver,  
attach the mounting bracket to the  
mounting location with the sup-  
plied screws and lock washers.  
(illus)  
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4. Attach the CB to the mounting  
bracket using the supplied rubber  
washers and mounting knobs.  
(illus)  
MOUNTING THE  
MICROPHONE HOLDER  
With a Phillips screwdriver and the  
supplied screws and washers, attach  
the supplied microphone holder to the  
CB’s right side.  
(illus)  
5
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CONNECTIONS  
Caution: Never pull on the micro-  
phone cable.  
CONNECTING THE  
MICROPHONE  
1. Make sure the pins on the micro-  
phone cable’s plug are aligned  
with the holes in the CB’s MICRO-  
PHONE jack on the CB’s left side  
and insert the plug into the jack.  
CONNECTING AN  
OPTIONAL EXTERNAL  
SPEAKER  
You can connect an external speaker  
to the CB.  
Notes:  
(illus)  
• You must use an 8-ohm speaker  
capable of handling up to 5 watts  
of power (such as Radio Shack  
Cat. No. 21-549).  
2. Slide the microphone onto the  
microphone holder.  
• The speaker’s cable must have a  
1/8-inch plug.  
To connect an external speaker, sim-  
ply plug the speaker’s cable into the  
CB’s EXT jack.  
(illus)  
(illus)  
To disconnect the microphone cable,  
press and hold down the small tab on  
the microphone plug, then pull out the  
plug.  
Note: When you connect an external  
speaker, the CB’s internal speaker dis-  
connects.  
(illus)  
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BATT +  
5. Connect the orange  
wire,  
CONNECTING POWER  
with in-line fuse, to your vehicle  
battery’s positive (+) terminal or to  
a point in the vehicle’s fuse box  
fuse that provides a continuous  
source of 12 volts even when the  
ignition is turned off.  
Using Vehicle Battery Power  
Follow these steps to power the CB  
from your vehicle’s battery.  
1. Make sure the CB is turned off.  
2. Disconnect the cable from your  
vehicle battery’s negative ( ) ter-  
minal.  
(illus)  
GROUND  
3. Connect the black  
wire  
to a metal part of your vehicle’s  
frame.  
This connection is for last-channel  
memory backup.  
(illus)  
6. Reconnect the cable to the vehi-  
cle battery’s negative ( ) terminal.  
Using Standard AC Power  
Note: Be sure the metal part is not  
insulated from the vehicle’s frame  
by a plastic part.  
You can power the CB from a standard  
AC outlet using a 12-volt DC power  
supply (such as Cat. No. 22-120)  
TO SWITCHED  
4. Connect the red  
ACCESSORY  
wire, with in-line  
Caution: Most 12-volt DC power sup-  
plies plug into a standard AC outlet to  
produce DC power. Before connecting  
your CB to a 12-volt DC power supply,  
read and follow the instructions includ-  
ed with the power supply.  
fuse, to a source of voltage that  
turns on and off with the ignition  
switch, such as a spare accessory  
terminal in your vehicle’s fuse box.  
1. Make sure the CB is turned off.  
(illus)  
2. Make sure the power supply is  
turned off.  
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3. Connect the black GROUND wire  
to the DC power supply’s negative  
(–) terminal.  
INSTALLING AN  
ANTENNA  
: To prevent damage to your  
Caution  
CB, you must connect an antenna to  
the CB before you operate it.  
(illus)  
: Your local Radio Shack store  
Note  
sells a variety of CB antennas for both  
mobile and base-station use, and co-  
axial antenna cable and connectors.  
For the best performance, consider the  
following when deciding on an antenna  
and its location:  
4. Connect both the red TO  
SWITCHED  
ACCESSORY  
and  
orange BATT + wires, with in-line  
fuses, to the DC power supply’s  
positive (+) terminal.  
• The antenna and cable should be  
as far as possible away from  
sources of electrical noise.  
• The antenna should be located  
vertically and as high as possible.  
(illus)  
Follow these steps to connect an an-  
tenna.  
1. Follow the mounting instructions  
that come with the antenna.  
: Use extreme caution  
Warning  
These wires supply power to oper-  
ate your CB and backup the last-  
channel memory.  
when you install or remove a base  
station CB antenna. If the antenna  
starts to fall, let it go! It could con-  
tact overhead power lines. If the  
antenna touches the power line,  
your contact with the antenna,  
mast, cable, or guy wires can  
cause electrocution and death.  
Call the power company to  
remove the antenna. DO NOT  
attempt to do so yourself.  
5. Connect the DC power supply to a  
standard AC outlet.  
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2. Route the cable between the  
antenna and the CB.  
ADJUSTING THE  
ANTENNA’S SWR  
3. Connect the cable to the  
ANTENNA jack on the back of the  
CB.  
To achieve your CB’s maximum range,  
the antenna’s Standing Wave Ratio  
(SWR) should be adjusted using an  
SWR meter (not supplied).  
Follow the instructions supplied with  
the SWR meter and antenna to adjust  
your antenna’s SWR to the lowest pos-  
sible value. SWR values of 2.0:1 are  
generally acceptable, with readings of  
1.5:1 or lower being more desirable.  
(illus)  
: Do not run the cable:  
Caution  
• Over sharp edges or moving parts  
that might damage the cable  
• Next to power cables or other CB  
antenna cables  
• Through the engine compartment  
or other areas that produce  
extreme heat  
9
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OPERATION  
SETTING SQUELCH  
USING AUTOMATIC  
NOISE LIMITING  
Caution: Do not attempt to use your  
CB without first connecting it to an an-  
tenna.  
If you hear low-level popping noises  
while receiving transmissions, slide  
ANL/OFF to ANL to turn on the auto-  
matic noise limiting circuit. Otherwise,  
leave ANL/OFF set to OFF (see “Re-  
ducing Noise” on Page 16).  
1. Turn VOLUME clockwise until it  
clicks to turn on the CB, then set it  
to about halfway between the min-  
imum and maximum settings. The  
CB tunes to the last-selected  
channel.  
(illus)  
(illus)  
LISTENING TO  
WEATHER  
BROADCASTS  
2. Turn SQUELCH fully counterclock-  
wise. You hear background noise  
and the green BUSY LED lights.  
The FCC (Federal Communications  
Commission) has allocated 11 chan-  
nels for use by the National Oceano-  
graphic and Atmospheric Admin-  
istration (NOAA). NOAA broadcasts  
your local forecast and regional weath-  
er information on one or more of these  
channels in your area.  
(illus)  
3. Adjust VOLUME to a comfortable  
setting.  
4. Turn SQUELCH clockwise just until  
the background noise stops.  
Note: To receive weaker transmis-  
sions, turn SQUELCH counter-  
clockwise.  
10  
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Your TRC-488 receives the following  
frequencies available to NOAA:  
2. To select the emergency channel  
(9), slide CH9/OUT to CH9. CH9  
flashes on the display.  
162.400 MHz  
162.425 MHz  
162.450 MHz  
162.475 MHz  
162.500 MHz  
162.525 MHz  
162.550 MHz  
(illus)  
To select one of the seven available  
weather channels, set the mode selec-  
tor to W1-W7. The yellow WX LED  
lights.  
: The emergency chan-  
Important  
nel is used for reporting and moni-  
toring emergency information  
about accidents, hazardous road  
conditions, etc. Do not use Chan-  
nel 9 for non-emergency mes-  
sages.  
(illus)  
: You cannot receive trans-  
Note  
missions on Channel 9 when the  
mode selector is set to any of the  
W1-W7 weather channels.  
3. To select one of the other 39  
channels, slide CH9/OUT to OUT.  
Turn CHANNEL to select the  
desired channel. The channel  
number appears on the LED  
channel display.  
RECEIVING  
TRANSMISSIONS ON  
THE CHANNELS  
After setting squelch, follow these  
steps to receive transmissions.  
1. Set the mode selector to CB.  
(illus)  
(illus)  
11  
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4. If necessary, turn RF.GAIN clock-  
wise to increase the signal sensi-  
tivity.  
4. Hold the microphone 2 or 3 inches  
from your mouth, then press and  
hold down the microphone talk  
button and speak into the micro-  
phone in a normal voice. The red  
TX indicator lights.  
(illus)  
(illus)  
To turn off the TRC-488, turn VOLUME  
counterclockwise until you hear it click.  
: Do not speak too loudly  
Note  
when transmitting. It does not  
make your signal any stronger,  
and might distort your transmis-  
sion.  
(illus)  
5. When you finish transmitting,  
release the microphone talk but-  
ton. You can now receive trans-  
missions.  
TRANSMITTING  
6. To turn off the TRC-488, turn VOL-  
UME counterclockwise until you  
hear it click.  
We recommend you spend some time  
receiving transmissions before you try  
to transmit a message yourself.  
Follow these steps to transmit.  
1. Set the mode selector to CB.  
2. Slide CH9/OUT to OUT.  
3. Turn CHANNEL to the desired  
channel.  
12  
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CB TIPS  
Like any other activity, CB radio has its  
rules and courtesies. The following tips  
will help you get the most enjoyment  
out of your CB.  
plan a get-together. You can even  
meet new friends this way.  
• Ever have car trouble or run out of  
gas on the highway? It’s a relief to  
be able to use the CB to call for  
assistance.  
COMMON USES FOR A  
CB RADIO  
• Camping, fishing, or other sports  
are more fun with a CB. Locate a  
buddy or find out “what’s cooking”  
back at camp.  
Business Uses  
• Truck drivers and delivery person-  
nel use it to get road and traffic  
conditions and obtain assistance  
in locating destinations. A CB is  
good company on those “long  
hauls.”  
CB COURTESY  
Please follow these guidelines of radio  
courtesy when using your CB.  
• Wait for a pause in someone  
else’s transmission before you  
ask for a break.  
• Construction crews use it to call  
for additional materials or for coor-  
dinating the activities of different  
work crews.  
• If you do not receive an answer to  
your call after a second attempt,  
sign off and wait several minutes  
before trying again.  
To security officers, a CB is more  
than a convenience — it is a must  
for both safety and efficiency.  
• Do not hold down the microphone  
talk button when you are not talk-  
ing. (This is called dead keying.)  
Personal Uses  
• Assist callers with directions,  
information about road conditions,  
• Keep in touch with home while  
driving to work, to the store, or to  
a social activity. Let your family  
know you are tied up in traffic or  
that you will stop by the store on  
the way home.  
and  
any  
other  
reasonable  
requests.  
• CBs are great on trips to commu-  
nicate with family members while  
they are in separate cars.  
• Contact friends or neighbors —  
find out “what’s happening” or  
13  
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21-1585.fm Page 14 Thursday, August 5, 1999 9:39 AM  
USING COMMON 10-CODES  
Citizen’s band operators have largely adopted the 10-codes for standard questions  
and answers. These codes permit faster communication and better intelligibility in  
noisy areas. The following table lists some of the more common codes and their  
meanings.  
Code  
Meaning  
Code  
Meaning  
10-1  
Receiving poorly/Cannot  
understand your message  
10-18  
10-19  
10-20  
10-21  
10-22  
Urgent  
Contact ______________  
What is your location?  
10-2  
Receiving well/Your signal is  
good  
Call _________ by telephone  
10-3  
10-4  
Stop transmitting  
Cancel/disregard previous  
message  
OK/Message received and  
understood  
10-23  
10-24  
10-25  
10-26  
Arrived at the destination  
Assignment complete  
10-5  
10-6  
Relay information to _______  
I am busy or are you busy?  
Out of service  
Meet ________________  
10-7  
Estimated time of arrival is  
__________  
10-8  
In service  
10-9  
Repeat last message  
Negative/No or standing by  
__________ in service  
Stand by  
10-29  
10-30  
Check records  
10-10  
10-11  
10-12  
10-13  
Use caution/Unauthorized  
use of radio  
10-31  
10-33  
Pick up  
Request/report road/weather  
conditions  
Emergency/Clear the chan-  
nel  
10-14  
10-15  
10-16  
10-17  
Information  
10-34  
10-36  
10-41  
What time is it?  
Message delivered  
Reply to message  
En route  
The correct time is ________  
Switch to Channel ________  
14  
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TROUBLESHOOTING  
If your CB is not working as it should, follow the suggestions below to try to eliminate  
the problem. If the CB is still not working properly, take the CB to your local Radio  
Shack store for assistance.  
Problem  
Solution  
Trouble with reception.  
• Be sure the CB is turned on.  
• Be sure VOLUME is turned up.  
• Be sure SQUELCH is adjusted properly.  
• Be sure the microphone is securely con-  
nected to the CB.  
• Be sure the antenna cable is securely con-  
nected to both the antenna and the CB.  
Trouble with transmission.  
• Be sure the microphone is securely con-  
nected to the CB.  
• Extend the antenna to its full length.  
• Clean and tighten all connectors.  
• Be sure you are fully pressing the micro-  
phone talk button.  
• Be sure the antenna cable is securely con-  
nected to both the antenna and the CB.  
No channel selection.  
Be sure CH9/OUT is set to OUT.  
Check the power supply (either vehicle or stan-  
dard AC) and in-line fuses (replace only with  
identical fuses; see “Replacing the Fuses” on  
Page 18).  
CB does not work at all.  
15  
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21-1585.fm Page 16 Thursday, August 5, 1999 9:39 AM  
If you operate the TRC-488 with the  
vehicle’s engine off, you should not  
have any problems with noise. If you  
use the CB with the engine on, you can  
determine the source of the noise by  
turning off the engine and operating  
the CB with the ignition set to ACC. If  
most or all of the noise goes away, the  
problem is in your vehicle’s ignition or  
electrical system.  
MAXIMUM RANGE  
The maximum range and quality of CB  
transmissions vary depending on:  
• The type and quality of antenna  
used.  
• The height of the antenna’s  
mounting location (the higher the  
antenna, the better the reception).  
• The surrounding terrain (moun-  
tains and tall buildings limit the  
range).  
Here are a few hints to help you reduce  
or eliminate such noise:  
• Replace old ignition wires with  
new, high-voltage, noise-suppres-  
sion wires.  
• The weather conditions.  
• The number of nearby CBs oper-  
ating on the same channel.  
• Install noise suppressors on your  
spark plugs, or install new spark  
plugs that have built-in suppres-  
sors.  
• The standing wave ratio (SWR)  
between the antenna and the CB.  
You can set the SWR by using an  
SWR tester (such as Radio Shack  
Cat. No. 21-523). Follow the  
instructions that come with the  
SWR tester.  
• Be sure that the ground connec-  
tion (black wire) is secure.  
If problems persist, check your alterna-  
tor/generator, regulator, and gauges.  
Noise from these sources can be re-  
duced or eliminated using bypass ca-  
pacitors at the various output voltage  
points.  
REDUCING NOISE  
The Automatic Noise Limiting (ANL)  
circuit helps keep background noise to  
a minimum. However, strong sources  
of noise, such as your vehicle’s igni-  
tion, another radio, or spark plugs may  
be more than the circuit can compen-  
sate for.  
Your local Radio Shack store has a  
wide selection of noise-suppression  
accessories.  
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MAINTENANCE  
Your TRC-488 40-Channel 2-Way CB Radio is an example of superior design and  
craftsmanship. The following suggestions will help you care for your CB so you can  
enjoy it for years.  
Keep the CB dry. If it gets wet, wipe it dry immediately. Liquids might  
contain minerals that can corrode the electronic circuits.  
Handle the CB gently and carefully. Dropping it can damage circuit  
boards and cases and can cause the CB to work improperly.  
Use and store the CB only in normal temperature environments.  
Temperature extremes can shorten the life of electronic devices and  
distort or melt plastic parts.  
Keep the CB away from dust and dirt, which can cause premature  
wear of parts.  
Wipe the CB with a damp cloth occasionally to keep it looking new.  
CLEANER  
Do not use harsh chemicals, cleaning solvents, or strong detergents  
to clean the CB.  
Modifying or tampering with the CB’s internal components can cause a malfunction  
and might invalidate your CB’s warranty. If your CB is not performing as it should,  
take it to your local Radio Shack store for assistance.  
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REPLACING THE FUSES  
FCC INFORMATION  
The TRC-488’s red wire 2-amp in-line  
fuse helps protect your CB from power  
surges and short-circuits. If the fuse  
has blown, replace it with a 2-amp,  
fast-acting glass fuse (such as Cat.  
No. 270-1007).  
The Federal Communications Com-  
mission (FCC) does not require you to  
have a license to operate this CB.  
However, the FCC does require you to  
read and know Part 95 of FCC Rules.  
These rules apply to the operation of a  
class D CB. A copy of these regula-  
tions is included with your CB.  
The orange wire’s 1-amp in-line fuse  
helps protect your CB’s memory chan-  
nel backup from power surges and  
short-circuits. If the fuse has blown, re-  
place it with a 1-amp, fast-acting glass  
fuse (such as Cat. No. 270-1005).  
Warning: Do not open your CB to  
make any internal adjustments. Inter-  
nal adjustments and/or modifications  
can lead to illegal operation as defined  
by Part 95 of FCC Rules. Such illegal  
operation can lead to very serious con-  
sequences.  
Follow these steps to replace either  
fuse.  
1. Make sure the power source and  
CB are both off.  
To be safe and sure:  
• Never open your CB’s case.  
• Never modify your CB.  
2. Hold the fuse holder by both ends,  
push the fuse holder ends  
together, then turn counterclock-  
wise and release either end. The  
fuse holder opens.  
Your CB might cause TV or radio inter-  
ference even when it is operating prop-  
erly. To determine whether your CB is  
causing the interference, turn off your  
CB. If the interference goes away, your  
CB is causing the interference. Try to  
eliminate the interference by:  
(illus)  
• Moving your CB away from the  
receiver.  
• Contacting your local Radio  
Shack store for help.  
3. Replace the fuse with one of the  
same type and rating.  
If you cannot eliminate the interfer-  
ence, the FCC requires that you stop  
using your CB.  
4. Push the fuse holder ends  
together, then turn the large end  
clockwise. The fuse holder closes.  
18  
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21-1585.fm Page 19 Thursday, August 5, 1999 9:39 AM  
SPECIFICATIONS  
RECEIVER  
Weather Frequency Coverage .............................................................162.400 MHz  
162.425 MHz  
162.450 MHz  
162.475 MHz  
162.500 MHz  
162.525 MHz  
162.550 MHz  
Frequency Coverage ..................................................All 40 CB Channels (Class D)  
26.965 to 27.405 MHz  
Sensitivity ............................................................0.7 µV or better for 10 dB (S+N)/N  
Adjacent Channel Rejection .......................................................... 50 dB (at 10 kHz)  
Audio Output.............................................................................. 4.5 Watts (Nominal)  
Frequency Response ............................................................................450-2500 Hz  
Intermediate Frequency...............................................................1st IF: 10.695 MHz  
2nd IF: 455.00 kHz  
Cross Modulation..............................................................................................50 dB  
Squelch.................................................................... Adjustable from 0.6 µV to 1 mV  
TRANSMITTER  
Frequency Coverage ..................................................All 40 CB Channels (Class D)  
26.965 to 27.405 MHz  
Output Power......................................................................4 Watts (FCC Maximum)  
Type of Modulation ............................AM Double-Sideband, Full Carrier Modulation  
Modulation Capability .......................................................................................+90%  
Spurious Emission......................................................................... Less than –65 dB  
Frequency Tolerance .....................................................................................0.002%  
Antenna Impedance ..................................................................................... 50 Ohm  
Current Drain (13.8 volt supply)....................................... 1 Amp with No Modulation  
1.5 Amps with Full Modulation  
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21-1585.fm Page 20 Thursday, August 5, 1999 9:39 AM  
GENERAL  
Power Requirements ........................................... 12-16 Volts DC, Negative Ground  
Dimensions .......................................................... 113/16 ¥ 513/16 ¥ 71/2 Inches (HWD)  
(46 ¥ 147 ¥ 190 mm)  
Weight............................................................................................... 2 lb 2 oz (1 Kg)  
Specifications are typical; individual units might vary. Specifications are subject to  
change and improvement without notice.  
RADIO SHACK LIMITED WARRANTY  
This product is warranted against defects for 90 days from date of pur-  
chase from Radio Shack company-owned stores and authorized Radio  
Shack franchisees and dealers. Within this period, we will repair it with-  
bring your Radio Shack sales  
out charge for parts and labor. Simply  
slip  
as proof of purchase date to any Radio Shack store. Warranty does  
not cover transportation costs. Nor does it cover a product subjected to  
misuse or accidental damage.  
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO  
EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES ARE LIM-  
ITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED  
WARRANTIES CONTAINED HEREIN. Some states do not permit limita-  
tion or exclusion of implied warranties; therefore, the aforesaid limita-  
tion(s) or exclusion(s) may not apply to the purchaser.  
This warranty gives you specific legal rights and you may also have other rights which vary  
from state to state.  
We Service What We Sell  
9/94  
RADIO SHACK  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
10A6  
Printed in Thailand  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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