Optimus Car Stereo System 120 1998 User Manual

Stereo Cassette (120-1998)  
Features  
Faxback Doc. # 6932  
The Optimus In-Dash AM/FM Stereo Cassette with Auto-Stop has many  
practical, easy-to-use features, and you can install it in almost any  
vehicle. The tuner's digital synthesized circuitry gives you precise  
tuning and drift-free reception.  
The stereo's anti-theft control panel lets you quickly remove and store  
it, making the stereo inoperative.  
The stereo contains many features that let you operate it easily so you  
can drive safely. The auto-stop cassette deck, memory tuning, seek  
tuning, and the FM optimizer circuitry all help make this stereo's  
operation simple and quick.  
Caution: Use common sense. Do not change the stereo's operation in heavy  
traffic or during hazardous driving conditions.  
This stereo's useful features include:  
Anti-Theft Control Panel - lets you quickly remove and store the stereo  
control panel in the included carry case. This  
discourages theft because the stereo does not  
operate without the control panel.  
Auto-Stop Cassette Deck - stops the tape when it reaches the end, to  
reduce wear on your tape and the cassette deck.  
Bass, Treble, and Balance Controls - let you adjust high and low sounds  
and the balance between speakers,  
letting you tailor the sound to suit  
your preference.  
Digital Clock - displays the time even when the Anti-Theft Control Panel  
is removed from the stereo.  
Memory Tuning - lets you quickly store and tune up to 30 of your favorite  
stations (12 AM and 18 FM).  
Seek Tuning - searches forward or backward to the next strong station in  
the selected band. This makes finding a favorite station  
quick and easy.  
CD Input Jack - lets you quickly connect this portable LCD player to the  
stereo, so you can play your favorite CDs in your vehicle.  
 
Stereo Cassette (120-1998)  
Installation  
Faxback Doc. # 6931  
BEFORE YOU BEGIN THE INSTALLATION  
Before you install the stereo, carefully read all instructions and see if  
you can answer these questions about the vehicle's electrical and sound  
systems.  
* Does my vehicle have a 12-volt negative ground system?  
* Which of the stereo's wires is the power wire?  
* Which terminal on my vehicle's fuse box is for accessories?  
* How do I connect a wire to the fuse box?  
* Which stereo wires are line-level outputs and which are speaker  
outputs?  
If you are unsure about any of the above questions or any part of the  
installation process, we recommend you have a professional auto sound  
system installer complete the installation.  
Cautions:  
* If installation requires cutting or modifying your vehicle, or if  
obstructions are behind the mounting surface, we recommend you have a  
professional installer complete the installation.  
* Before you mount the stereo or install any speakers, temporarily  
connect the speakers, power wires, and antenna to test the stereo.  
Preparing the Mounting Area  
Before you mount the stereo, make sure you have all the necessary  
materials. Then confirm that the stereo fits your vehicle's stereo  
mounting area. The mounting area must be at least 7 inches (17.8 cm)  
deep.  
Note: If the mounting area is too large, you might be able to mount the  
stereo with an in-dash installation kit, available at your local Radio  
Shack store. Follow the installation kit's instructions to mount the  
stereo.  
Routing Speaker Wire  
 
If you install speakers, avoid routing the speaker wire near moving parts  
or sharp edges. You can usually route it along the wiring channel  
beneath the vehicle's door facings by carefully removing the molding that  
holds the carpet in place. After you route the speaker wire, replace the  
molding.  
Testing the Stereo  
Before you mount the stereo or any speakers you are installing, test the  
stereo by temporarily connecting the speakers, power wires, and antenna.  
Important: Do not cut these wires. If you cut any wire, you cannot  
obtain a refund or exchange on this product. Radio Shack  
will provide warranty service if you cut a wire and find the  
product is defective.  
MAKING THE CONNECTIONS  
The supplied 14-wire harness includes all the lead wires you need to  
connect the stereo to speakers, power, and optional components. You might  
need additional wire, depending on your individual auto sound system, to  
complete connections. Your local Radio Shack store carries a full line of  
wire and wire management accessories.  
Cautions:  
* For added safety and to protect your stereo, disconnect the cable from  
your vehicle battery's negative (-) terminal before you begin.  
* Be sure your speakers can handle 9 watts of power (4.5 watts per  
channel). Each speaker must have an impedance of at least 4 ohms.  
Your local Radio Shack store carries a full line of speakers.  
* You must connect a separate wire to each speaker terminal as described  
in the following procedure. Do not use a common wire or chassis  
ground for any speaker connection.  
Using an Adapter Harness  
If you are replacing an existing stereo, or if your vehicle has been  
factory-wired for autosound components, you might be able to use an  
adapter harness to connect the power and speakers. Radio Shack stores  
sell adapter harnesses for most vehicles.  
Follow the directions that come with the adapter harness to temporarily  
 
connect the power and speakers.  
Connecting the Speakers  
1. Connect the gray wire to the right speaker's positive terminal. This  
terminal is usually marked with a plus(+) sign or red mark.  
2. Connect the gray/black wire to the right speaker's negative terminal.  
This terminal might be marked with a minus (-) sign or it might not  
be marked at all.  
3. Connect the white wire to the left speaker's positive terminal.  
4. Connect the white/black wire to the left speaker's negative terminal.  
Connecting Power  
Follow these steps to connect ground and primary, memory backup, and  
remote power.  
1. Connect the black ground wire to a chassis ground, such as a metal  
screw attached to a metal part of the vehicle's frame. Be sure that  
the screw is not insulated from the chassis by a plastic part.  
2. Connect the yellow wire (with in-line fuse holder) to your vehicle  
battery's positive (+) terminal or to a fuse that provides a  
continuous source of 12 volts. The connection provides continuous  
power for the clock and tuner memory when the ignition is turned off.  
3. Connect the red power wire (with in-line fuse holder) to a point in  
your vehicle's fuse block that has power only when you turn the  
vehicle's key to either accessory (ACC) or START position.  
This connection provides power to the stereo when you turn on the  
ignition or turn the key to ACC, and turns off power when you turn off  
the ignition. This prevents your vehicle's battery from being drained  
if you leave the stereo on when you turn off the ignition.  
4. Connect the blue wire to any optional equipment that you want the  
stereo to turn on and off, such as a power antenna.  
This wire does not provide power to the component. It simply turns  
other equipment on or off. If you do not use this wire, secure it  
with a wire tie and do not let it touch metal.  
5. Plug the 14-pin wire harness into the stereo's 14-pin wiring socket.  
 
Connecting the Antenna and the Battery  
Connect the vehicle's antenna cable to the stereo's large black antenna  
connector, then reconnect the cable to the vehicle battery's negative  
terminal.  
TESTING THE CONNECTIONS  
Turn on your vehicle's ignition and test the stereo.  
If the stereo does not work, immediately disconnect your vehicle battery's  
negative (-) terminal. Then, recheck your connections, or have a  
professional auto sound system installer install the stereo.  
After you test the stereo and verify that everything works, make sure the  
connections are correctly marked or identified.  
MOUNTING THE STEREO  
Be sure you test the stereo first and verify that it works properly.  
Follow these steps to mount the stereo.  
1. Disconnect the cable from the vehicle battery's negative (-) terminal.  
2. Temporarily disconnect the wiring harness and the antenna.  
3. Insert the supplied sleeve into the dash. Then secure the sleeve to  
the dash by bending out the appropriate tabs with a screwdriver.  
Bend out all the side tabs.  
4. Reconnect the wiring harness and the antenna.  
5. Slide the stereo into the sleeve until it locks into place.  
6. To further secure the stereo, use the supplied hardware to attach one  
end of the supplied metal strap to the back of the stereo. If  
necessary, bend the metal strap to fit your vehicle's mounting area.  
Then attach the other end of the strap to an existing bolt on a solid  
metal part of the vehicle.  
This strap also helps ensure proper electrical grounding of the  
stereo.  
 
7. Reconnect the cable to the vehicle battery's negative (-) terminal.  
REMOVING THE STEREO FROM THE DASH  
1. Disconnect the cable from the vehicle battery's negative (-) terminal.  
2. Remove the metal strap attached to the back of the stereo.  
3. Insert both of the provided keys into the slots at the lower left and  
right sides of the stereo. Then slide the stereo out of the dash.  
4. Remove the keys from the slots by pressing the latches either below  
the keys or on the lower left and right sides of the stereo.  
5. Disconnect the wiring harness and the antenna.  
6. Reconnect the cable to the vehicle battery's negative (-) terminal.  
 
Stereo Cassette (120-1998)  
Compact Disk Use  
Faxback Doc. # 6928  
CONNECTING A COMPACT DISC PLAYER  
You can connect a portable CD player (or other audio component with a  
line-level output) to the stereo.  
Use a stereo mini-jack cable with 1/8-inch plugs, such as Cat. No.  
420-2387. Connect one end of the cable to the stereo's CD IN jack.  
Connect the cable's other end to the output jack of the CD player when  
you are not using it.  
 
Stereo Cassette (120-1998)  
Control Panel  
Faxback Doc. # 6926  
The stereo's control panel must be in place for the stereo to operate.  
When you remove it, the clock will display, but the stereo cannot be used.  
This is a simple, but effective, security feature  
REMOVING THE CONTROL PANEL  
1. Push down DOWN ARROW until you hear a click. The control panel swings  
out.  
2. Remove the control panel, then store it in the supplied case.  
REINSTALLING THE CONTROL PANEL  
1. Gently squeeze the sides of the supplied case until the control panel  
pops out.  
2. Insert the right edge of the control panel into the right edge of the  
recess. Make sure the pins in the recess fill the holes in the edge  
of the control panel.  
3. Gently push the left edge of the control panel into the recess until  
you hear a click.  
 
Stereo Cassette (120-1998)  
UNDERSTANDING THE CONTROLS  
Operations  
Faxback Doc. # 6929  
When you listen to your stereo, adjust the following controls to suit  
your listening preferences.  
ON/VOL-To turn on the stereo, turn this knob clockwise until you hear it  
click. Turn the knob further clockwise to adjust the volume. To turn off  
the stereo, turn the knob counterclockwise until you hear it click.  
Warning: To protect your hearing, do not listen at high volume levels.  
Slowly increase the volume to a comfortable listening level.  
BAL - Rotate to adjust the balance between the left and right speakers.  
BASS - Turn to increase or decrease low sounds.  
TREBLE - Turn to increase or decrease high sounds.  
SETTING THE CLOCK  
1. Press F/C if necessary until the display shows the clock.  
2. While you press and hold down F/C, repeatedly press TUN/SEEK DOWN  
ARROW until the display shows the correct hour. To make the hour  
advance quickly, press and hold down TUN/SEEK DOWN ARROW.  
3. Continue holding down F/C and repeatedly press TUN/SEEK UP ARROW  
until the display shows the correct minute. To make the minute  
advance quickly press and hold down TUN/SEEK UP ARROW.  
4. When the display shows the correct time, release F/C.  
USING THE RADIO  
1. Turn ON/Vol clockwise to turn on the stereo.  
2. Press BAND to select between the 2 AM and 3 FM bands. AM1 or AM2  
appears on the display when an AM band is selected. FM1, FM2, or FM3  
appears on the display when an FM band is selected.  
When you turn off the stereo, then turn it back on, the radio  
automatically tunes to the last station and band you selected.  
 
3. Tune to the desired station in one of the following ways.  
Manual Tuning: Repeatedly press TUN/SEEK UP ARROW or DOWN ARROW to tune  
up or down the selected band.  
Seek Tuning: Press and hold TUN/SEEK UP ARROW or DOWN ARROW for about 1  
second to tune to the next higher or lower station with a  
strong signal.  
4. Adjust ON/VOL, BASS, TREBLE and BAL as desired.  
Notes:  
* ST appears on the display when an FM stereo signal is received.  
* To improve reception of a weak FM stereo station, change the sound to  
monaural by pressing M/S. MO appears on the display. Press M/S again  
to return to stereo sound.  
* If the stereo does not find a strong station when seeking, the stereo  
searches the band again and stops on weaker stations.  
* To temporarily display the frequency of the station currently playing,  
press F/C. The display shows the frequency for 5 seconds, then  
returns to the time display.  
 
Stereo Cassette (120-1998)  
Storing Stations  
Memory  
Faxback Doc. # 6930  
You can store up to 12 AM and 18 FM stations in memory. You can then  
select a stored station by pressing the correct memory location button.  
1. Press BAND to select the desired band.  
2. Use either of the tuning methods to tune to the station you want to  
store.  
3. Press and hold the desired memory location button for about 2 seconds  
until it sounds a beep.  
The band number, the frequency, and the memory location number appear on  
the display to show that the station is stored.  
Automatically Storing Stations  
You can let the stereo automatically store stations. You can then select  
a stored station by pressing the correct memory location button.  
1. Press BAND to select the desired band (AM1, AM2, FM1, FM2, or FM3).  
2. Use either of the tuning methods to tune to the frequency just before  
the first station you want to store.  
3. Press and hold down AMS for about 3 seconds. The stereo scans the  
selected band, then, after about 2 seconds, automatically stores the  
first six stations it finds. The stereo beeps as it stores the first  
and last stations.  
The band number, the frequency, and the memory location number appear  
on the display.  
4. Press AMS when the stereo has stored the six stations.  
Note: If you do not press AMS, the stereo will scan the band again and  
tune to each stored station for about 5 seconds.  
Selecting a Stored Station  
To select a stored station, simply press the desired memory location  
button. To scan stations you already stored press AMS.  
 
USING THE CASSETTE PLAYER  
Warning: To prevent hearing damage, always turn the volume to its lowest  
level before you begin listening to a tape.  
Note: Avoid using C-120 cassette tapes. They are very thin and easily  
become tangled in the tape-handling parts.  
Follow these steps to play a cassette tape.  
1. Take up any slack by turning the cassette's hub with your finger or a  
pencil.  
Avoid touching the tape.  
2. Insert the tape into the cassette compartment with its open edge to  
the right and the side you want to hear facing up. The tape begins to  
play.  
3. Adjust ON/VOL, BASS, TREBLE, and BAL to suit your listening  
preferences.  
4. Press the eject button halfway to fast-forward the tape. To stop  
fast-forward, gently press the eject button again.  
5. Push the eject button all the way to stop the tape and eject the  
cassette.  
 
Stereo Cassette (120-1998)  
RADIO  
Specifications  
Faxback Doc. # 6927  
FM  
AM  
530-1710KHz  
60 dB  
Frequency Range  
IF Rejection  
88-108 MHz  
75 dB  
Image Rejection  
Selectivity  
45 dB  
60 dB  
70 dB  
30 dB  
Signal-to-Noise (S/N) Ratio  
Stereo Separation  
Usable Sensitivity  
66 dB  
30 dB  
50 dB  
-
2.5uV (3% THD) 32uV (20 dB S/N)  
CASSETTE PLAYER  
Cassette Mechanism..............................................Auto-stop  
Wow and Flutter......................................Less than 0.35% WRMS  
Signal-to-Noise Ratio...............................................50 dB  
Separation..........................................................38 dB  
Frequency Response (-3 dB)................................125 to 8,000 Hz  
GENERAL  
Power Source..................................12 Volts DC Negative Ground  
Speaker Output Impedance.................................4 ohms or 8 ohms  
Output Power..............................9 Watts (4.5 Watts Per Channel)  
Chassis Size...............................2 5/16 x 7 3/8 x 7 9/16 Inches  
(58.7 x 187.3 x 192.1 Millimeters)  
Weight.................................................3 lbs 5 oz (1.5kg)  
CD PLAYER INPUT  
Input Type.............................................Line Level, Stereo  
Mini-Jack, 1/8-inch  
Specifications are typical; individual units may vary. Specifications  
are subject to change without notice.  
(smm/ir-06/12/95)  
LN-03/04  
 

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