Optimus 120 2155 User Manual

High-Power In-Dash AM/FM Stereo CD Player  
(120-2154/55) Features  
Faxback Doc. # 48528  
This document contains instructions for both Cat. No. 120-2154 and  
120-2155 stereos. (You can find the Cat. No. of your model on the top  
of the stereo.) 120-2154 has a LOUD button while 120-2155 has an FSM  
button. Unless otherwise noted, these are the primary differences  
between the two units listed.  
Your Optimus High-Power In-Dash AM/FM Stereo CD Player has many practical,  
easy-to-use features, and you can install it in almost any vehicle. The  
stereo's anti-theft control panel lets you quickly remove it, making the  
stereo inoperative. The auto travel programming feature lets you store  
strong local stations into a separate travel memory.  
Memory tuning, seek and scan tuning, and FM optimizer circuitry all help  
make your stereo's operation simple and quick to help you drive safely.  
CAUTION: Use common sense. Do not change your stereo's settings in heavy  
traffic or during hazardous driving conditions.  
CD PLAYER  
Audible Search - lets you rapidly play a CD in either direction to locate  
a desired section of a track.  
Intro Scan - scans and plays the first 10 seconds of each track, so  
you can find a specific track.  
Shuffle Play - randomly selects and plays tracks from the loaded CD.  
Repeat Play - automatically repeats the current track.  
AM/FM STEREO TUNER  
Band Button - lets you easily select one of the stereo's AM or  
FM bands.  
Memory Scan Tuning - scans all stations stored in memory, playing for  
5 seconds on each.  
Memory Tuning - lets you quickly store and tune up to 18 of your  
favorite stations (6 AM and 12 FM).  
Auto Travel - lets you automatically store the first 6 strong  
The CD player in this stereo system is made and tested to meet exacting  
safety standards. It meets FCC requirements and complies with safety  
performance standards of the U.S. Department of Health and Human Service.  
WARNINGS: This system employs 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 might result in hazardous radiation  
exposure.  
High-Power In-Dash AM/FM Stereo CD Player  
(120-2154/55) Installation  
Faxback Doc. # 48529  
This document contains instructions for both Cat. No. 120-2154 and  
120-2155 stereos. (You can find the Cat. No. of your model on the top  
of the stereo.) 120-2154 has a LOUD button while 120-2155 has an FSM  
button. Unless otherwise noted, these are the primary differences  
between the two units listed.  
BEFORE YOU BEGIN THE INSTALLATION  
Before you install your stereo, read all the instructions in this owner's  
manual. You should be able to answer all of these questions about your  
vehicle's electrical and sound systems.  
Which terminal in my vehicle's fuse box supplies power even when the  
ignition is turned off?  
Which terminal in my vehicle's fuse box is for accessories?  
How do I connect a wire to the fuse box?  
Also, be aware that installation in your vehicle might require cutting or  
modifying your vehicle.  
Place the stereo as close as possible to the selected mounting location.  
We recommend that you install the stereo by temporarily connecting it to  
ground and power, optional components, and your speakers. Then test the  
connections, disconnect the stereo, mount it in your vehicle, and  
reconnect it. The instructions in this manual are arranged in this order.  
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 mounting  
area. This autosound stereo system is a DIN-E size unit that requires a  
2-inch high by 7-1/2-wide by 7-1/4 inch deep (57 x 190 x 186 mm) mounting  
area.  
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  
RadioShack store. Follow the installation kit's instructions to  
mount the stereo.  
CAUTIONS: Make sure the stereo will not tilt up more than 30 degrees when  
it is mounted.  
Be sure to avoid obstructions behind the mounting surface.  
Routing Speaker Wires  
If you install speakers, avoid routing the speaker wires near moving parts  
or sharp edges. You can usually route them 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 wires, replace the  
molding.  
Removing the Shipping Screw  
The shipping screw helps protect the stereo's CD player from being damaged  
during shipment.  
Before you mount the stereo, use a Phillips screwdriver to remove the  
shipping screw from the top of the stereo.  
Note: Save the shipping screw in case you ever want to mail or ship the  
stereo. You can secure it to the back of the stereo with a piece  
of tape.  
MAKING THE CONNECTIONS  
The supplied harness with the 14-pin connector includes all the lead wires  
you need to connect the stereo to ground, power, some optional components,  
and speakers.  
IMPORTANT: Do not cut these wires. If you cut any wire, you cannot  
obtain a refund or exchange on this product. However, your  
local RadioShack store will provide warranty service if you  
cut a wire and find the product is defective.  
You might need additional wire, depending on your individual  
autosound system, to complete the connections. Your local  
RadioShack 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 64 Watts of power (16 Watts  
per channel). Each speaker must have an impedance of at least  
4 Ohms. Your local RadioShack store carries a full line of  
speakers.  
You must connect the GROUND, +12V TO IGNITION, and +12V TO  
BATTERY wires first, then make all other connections as  
described in the following sections before you plug the harness  
with the 14-pin connector into the stereo. If you do not make  
connections in the order shown, damage to the stereo is  
possible if any wire connections are made incorrectly.  
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.  
Note: The wires in the wiring harness have the following colors and  
labels.  
(Black) - Ground  
(Red) - +12V to Ignition  
(Yellow) - +12V to Battery  
(Blue/White) - AMP Remote Turn on 500 mA MAX  
(White) - Front Left Speaker (+)  
(White/Black) - Front Left Speaker (-)  
(Gray) - Front Right Speaker (+)  
(Gray/Black) - Front Right Speaker (-)  
(Green) - Rear Left Speaker (+)  
(Green/Black) - Rear Left Speaker (-)  
(Violet) - Rear Right Speaker (+)  
(Violet/Black) - Rear Right Speaker (-)  
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. RadioShack stores sell  
adapter harnesses for most vehicles.  
Follow the directions that come with the adapter harness to temporarily  
connect the ground, power, optional components, and speakers. Then go to  
"Connecting the Antenna" below.  
Connecting Ground, Power, and Optional Components  
Follow these steps to connect the harness with the 14-pin connector to  
ground, primary and memory backup power, and optional components.  
(Black) - Ground  
(Red) - + 12V to Ignition  
(Yellow) - + 12V to Battery  
(Blue/White) - AMP Remote Turn on 500 mA MAX  
1. Disconnect the cable from your vehicle's negative (-) battery  
terminal.  
2. 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.  
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 the accessory (ACC) or START position. This  
connection turns on the stereo when you turn on the ignition or turn  
the key to ACC, and turns off the stereo 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 yellow power/memory wire to your vehicle battery's  
positive (+) terminal or to a point in your vehicle's fuse block that  
provides a continuous source of 12 volts.  
This connection provides power for the stereo's components (such as  
the CD player), and continuous power for the stereo's memory when the  
ignition is turned off.  
5. Connect the blue/white wire to any optional equipment, designed to run  
from a switched source, that you want the stereo to turn on and off  
(such as a booster or a power antenna).  
This wire does not provide power to the components. It simply turns  
them on or off. If you do not use this wire, secure it with a wire  
tie and do not let it touch metal.  
Connecting an Equalizer/Booster  
If you are connecting the stereo to a separate equalizer or booster, you  
need additional wires (not included).  
To increase the total power output from your system, connect the R (right)  
and L (left) line output jacks on the back of the stereo and blue/white  
wire, if necessary, to the equalizer or booster.  
Check the equalizer/booster's owner's manual for directions.  
Connecting Two Pairs of Speakers  
If you are using both front and rear speakers, follow these steps to  
connect the harness with the 14-pin connector to the speakers.  
12-2154 Only: Before connecting the speakers, remove the tape that holds  
the mounting sleeve in place and slide the sleeve off of  
the stereo. Then set 2CH/4CH on the bottom of the stereo  
to 4CH.  
(White) - Front Left Speaker (+)  
(White/Black) - Front Left Speaker (-)  
(Gray) - Front Right Speaker (+)  
(Gray/Black) - Front Right Speaker (-)  
(Green) - Rear Left Speaker (+)  
(Green/Black) - Rear Left Speaker (-)  
(Violet) - Rear Right Speaker (+)  
(Violet/Black) - Rear Right Speaker (-)  
1. Connect the gray wire to the right front 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 front 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 front speaker's positive terminal.  
4. Connect the white/black wire to the left front speaker's negative  
terminal.  
5. Connect the violet wire to the right rear speaker's positive terminal.  
6. Connect the violet/black wire to the right rear speaker's negative  
terminal.  
7. Connect the green wire to the left rear speaker's positive terminal.  
8. Connect the green/black wire to the left speaker's negative terminal.  
Connecting One Pair of Speakers  
For 12-2155: If you are using only one pair of speakers, follow Steps 1-4  
in "Connecting Two Pairs of Speakers" above to connect the  
harness with the 14-pin connector to the speakers.  
(White) - Left Speaker (+)  
(White/Black) - Left Speaker (-)  
(Gray) - Right Speaker (+)  
(Gray/Black) - Right Speaker (-)  
(Green) - |\  
(Green/Black) - |\\___ Do Not Connect  
(Violet) - |//  
(Violet/Black) - |/  
For 12-2154: If you are using only one pair of speakers, remove the tape  
that holds the mounting sleeve in place and slide the sleeve  
off of the stereo. Then set 2CH/4CH on the bottom of the  
stereo to 2CH. Then follow these steps to connect the  
harness with the 14-pin connector to the speakers.  
(This section has been corrected. See Faxback Doc. # 48535.)  
(White) - Left Speaker (+)  
(Green) - Left Speaker (-)  
(Gray) - Right Speaker (+)  
(Violet) - Right Speaker (-)  
(White/Black) - |\  
(Green/Black) - |\\___ Do Not Connect  
(Gray/Black) - |//  
(Violet/Black) - |/  
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 violet 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 green wire to the left speaker's negative terminal.  
Connecting the Antenna  
Connect the vehicle's antenna cable to the antenna jack on the back of the  
stereo.  
Completing the Connections  
Make sure you have securely made all other connections, then plug the  
harness' connector into the stereo's 14-pin wiring socket. Reconnect the  
cable to the vehicle's negative (-) battery terminal.  
TESTING THE CONNECTIONS  
Turn on your vehicle's ignition and install your stereo's control panel  
(see "Installing the Control Panel" in Faxback Doc. # 48530), ON/OFF  
lights. Then press ON/OFF. The stereo's buttons and display light.  
If the stereo does not work, immediately disconnect the cable from your  
vehicle's negative (-) battery terminal. Then recheck your connections.  
After you verify that the button/display light, follow the instructions  
in "Mounting the Stereo" below.  
CAUTION: If you played a CD while testing the connections, be sure to  
remove the CD from the stereo before continuing.  
MOUNTING THE STEREO  
Be sure you verify that the stereo is connected properly (see "Testing the  
Connections" above). Then follow these steps to mount the stereo.  
1. Make sure the ignition is turned off, then disconnect the cable from  
your vehicle's negative (-) battery terminal.  
2. Disconnect the wire harness and the antenna.  
3. Press RLS on the right side of the control panel to remove the control  
panel.  
4. Remove the tape that holds the sleeve in place and slide the sleeve  
off of the stereo.  
Note: If you have a Cat. No. 12-2154 stereo, you have already removed  
the tape (while setting 2CH/4CH). Continue with Step 5.  
5. Turn the sleeve around so the flat tabs on the front are facing you,  
then insert it into the dash. Then secure the sleeve to the dash by  
bending out the tabs with a screwdriver. Bend out all the side tabs.  
6. If your vehicle has an existing mounting hole behind the dash, use  
pliers or a 5/16-inch box end wrench to attach the short end of the  
supplied mounting bolt to the back of the stereo.  
7. Reconnect the wire harness and the antenna.  
8. Slide the stereo into the sleeve until it locks into place.  
9. If you are securing the stereo in an existing mounting hole in the  
dash, push the supplied rubber mounting grommet onto the mounting  
bolt.  
Then push the mounting bolt (covered by the mounting grommet) through  
the mounting hole and make sure it is secure.  
Otherwise, you can use one of the supplied bolts (with attached  
washer) to attach one end of the supplied metal strap to the mounting  
hole on the back of the stereo. If necessary, bend the metal strap to  
fit your vehicle's mounting area. Then use either the supplied sheet  
metal screws or the other bolt (with attached washer) to attach the  
other end of the strap to a solid metal part of the vehicle under the  
dashboard. This strap also helps ensure proper electrical grounding  
of the stereo.  
10. Reconnect the cable to the vehicle battery's negative (-) terminal.  
Then install the stereo's control panel (see "Installing the Control  
Panel" in Faxback Doc. # 48530).  
Note: You might need to reset the stereo's clock after you reconnect  
the cable to the vehicle battery.  
REMOVING THE STEREO FROM THE DASH  
If you ever want to remove the stereo from the dash, follow these steps.  
1. Disconnect the cable from your vehicle's negative (-) battery  
terminal.  
2. If you secured the stereo to an existing mounting hole under the dash,  
slide out the stereo to free the mounting bolt from the mounting hole.  
Or, remove the bolt holding the metal strap attached to the back of  
the stereo.  
3. Press RLS to remove the stereo's control panel.  
4. Insert the supplied keys into the slots at the left and right sides  
of the stereo. Press the keys downward and slide the stereo out of  
the dash.  
Note: The keys are labeled to show their top edges.  
5. Remove the keys from the slots.  
6. Disconnect the wire harness and the antenna.  
7. If you are mailing or shipping the stereo, use a Phillips screwdriver  
to reinstall the shipping screw in the top of the stereo.  
8. Reconnect the cable to the vehicle battery's negative (-) terminal.  
High-Power In-Dash AM/FM Stereo CD Player  
(120-2154/55) Control Panel  
Faxback Doc. # 48530  
This document contains instructions for both Cat. No. 120-2154 and  
120-2155 stereos. (You can find the Cat. No. of your model on the top  
of the stereo.) 120-2154 has a LOUD button while 120-2155 has an FSM  
button. Unless otherwise noted, these are the primary differences  
between the two units listed.  
USING THE CONTROL PANEL  
The stereo's control panel must be in place for the stereo to operate.  
When you remove it, the display turns off and the stereo cannot be used.  
This is a simple but effective security measure.  
Any stored stations remain in memory when the control panel is removed.  
INSTALLING THE CONTROL PANEL  
1. Insert the left edge of the control panel into the left edge of the  
recess. The hole in the control panel interlocks with the tab in the  
recess.  
2. Gently push the right edge of the control panel into the recess until  
you hear a click.  
REMOVING THE CONTROL PANEL  
1. Press RLS. You hear a click and the control panel swings out.  
2. Remove the control panel, then store it in the supplied carry case.  
CAUTION: To keep the metal connecting pins clean, do not touch the  
connecting pins in the recess or on the back of the control  
panel.  
High-Power In-Dash AM/FM Stereo CD Player  
(120-2154/55) Operation  
Faxback Doc. # 48531  
This document contains instructions for both Cat. No. 120-2154 and  
120-2155 stereos. (You can find the Cat. No. of your model on the top  
of the stereo.) 120-2154 has a LOUD button while 120-2155 has an FSM  
button. Unless otherwise noted, these are the primary differences  
between the two units listed.  
BASIC OPERATION  
TURNING THE STEREO ON AND OFF  
To turn on the stereo, press ON/OFF. The buttons and display light. To  
turn off the stereo, press ON/OFF again.  
SETTING THE CLOCK  
1. Press ON/OFF to turn on the stereo.  
2. While holding down CLOCK, repeatedly press TUNE/SEEK TRACK + until the  
stereo displays the correct hour. (To continuously advance the hour,  
hold down TUNE/SEEK TRACK +.)  
3. While holding down CLOCK, repeatedly press TUNE/SEEK TRACK - until the  
stereo displays the correct minute. (To continuously advance the  
minute, hold down TUNE/SEEK TRACK -.)  
Notes: The clock resets the seconds to 0 as soon as you stop advancing  
the minute.  
You can use a watch with a sweep second hand or other time  
reference to set the clock to the exact second at the beginning of  
an hour. When the time reference reaches the beginning of an  
hour, hold down CLOCK, then press 6. The clock resets the minutes  
and seconds to 00 and advances the hour if the minutes were past  
29.  
ADJUSTING THE SOUND  
When you listen to your stereo, adjust these controls to suit your  
listening preferences.  
AUDIO CONTROL SEL +/- - Repeatedly press or hold down to increase or  
decrease the volume. VOL and a volume level  
number appear.  
WARNING: To protect your hearing, do not listen at high volume levels.  
Slowly increase the volume to a comfortable listening level.  
AUDIO CONTROL SEL - Repeatedly press until bAS, TRE, bAL, or FAd and a  
number appear on the display, then repeatedly press  
or hold down + or - within 5 second to change the  
stereo's bass, treble, balance, or fader settings.  
Notes: When you adjust the balance toward the left speakers, L and a  
number appear on the display. When you adjust the balance toward  
the right speakers, R and a number appear.  
When you adjust the fader toward the front speakers, F and a  
number appear on the display. When you adjust the fader toward  
the rear speakers, R and a number appear.  
If bAS, TRE, bAL, or FAd and the number disappear before you press  
+ or -, repeatedly press AUDIO CONTROL SEL until the setting you  
want reappears, then repeatedly press or hold down + or - to set  
it.  
To set bass, treble, balance, and fader to their center (middle)  
settings, hold down AUDIO CONTROL SEL for about 3 seconds until  
the stereo beeps twice.  
LOUD (12-2154 Only) - To increase the low ranges of sounds, repeatedly  
press LOUD until ON appears. To turn off loudness,  
repeatedly press LOUD until OFF appears.  
The LOUD button is lit continuously while the  
stereo is on.  
(This section has been corrected. See Faxback Doc.  
# 48535.)  
FAVORITE SOUND MEMORY (12-2155 ONLY)  
You can store your stereo's current volume, bass, treble, balance, and  
fader settings into memory. This lets you select the best sound for the  
music you listen to and save that sound, so you can recall it later. You  
can store two FSM (favorite sound memory) settings.  
Follow these steps to store an FSM setting.  
1. Repeatedly press FSM until FSM I or FSM II appears.  
2. Adjust the volume, bass, treble, balance and fader using the  
information in "Adjusting the Sound" above.  
Note: FSM I or FSM II blinks while you adjust the controls.  
3. When you finish adjusting the stereo's settings, hold down FSM until  
the stereo beeps twice. This indicates that the settings you entered  
are saved in the FSM setting you selected.  
To select an FSM setting you saved, repeatedly press FSM until FSM I or  
FSM II appears. The stereo is set to those settings you entered in Step  
2.  
To turn off FSM, repeatedly press FSM until FSM I and FSM II disappear  
from the display. The stereo is set to its default settings.  
DISPLAYING THE CLOCK  
While the radio or a CD is playing, press CLOCK to display the clock.  
TURNING THE KEY TONE ON AND OFF  
The stereo is preset to beep when you press most buttons. To turn the key  
tone off, turn the stereo off, then hold down ATP (automatic travel  
programming) and 6 together for about 3 seconds until bP (beep) OFF  
appears.  
To turn the key tone back on, turn the stereo off, then hold down ATP and  
6 together for about 3 seconds until bP ON appears.  
RADIO OPERATION  
PLAYING THE RADIO  
1. Press ON/OFF to turn on the stereo. The radio automatically tunes to  
the last station and band selected.  
2. Press BND to select the desired band. AM appears when the AM band is  
selected. FMI or FMII appears when an FM band is selected.  
3. Tune to the desired station in one of the following ways.  
Manual Tuning: Repeatedly press TUNE/SEEK TRACK - or + to tune down  
or up the selected band.  
Seek Tuning: Hold down TUNE/SEEK TRACK - or + for about 1 second to  
tune to the next lower or higher station.  
4. Press AUDIO CONTROL SEL + or - to increase or decrease the volume as  
desired.  
Notes: ST appears when an FM signal is received in stereo.  
See "Adjusting the Sound" above for information about changing the  
stereo's other settings.  
MEMORY TUNING  
You can manually store up to 6 AM and 12 FM stations in memory groups.  
Each memory group (AM, FMI, and FMII) holds up to six stations. You can  
also automatically store the first 6 strong AM and first 6 strong FM  
stations in a separate automatic travel programming memory.  
Storing Stations  
1. Repeatedly press BND to select the desired memory group (AM, FMI, or  
FMII).  
2. Tune to the station you want to store.  
3. Hold down the desired memory channel button until P-, the memory  
channel number, and the frequency flash once on the display. The  
station is stored.  
Storing Stations in Automatic Travel Programming Memory  
The stereo can store the first 6 strong AM and the first 6 strong FM  
stations it finds into its automatic travel programming (ATP) memory.  
This memory is separate from the stereo's memory groups, so it does not  
replace the stations you manually stored.  
1. Repeatedly press BND to select the desired band (AM, FMI, or FMII).  
2. Hold down ATP (automatic travel programming) for about 2 seconds. The  
stereo displays ATP, scans the selected band, and automatically stores  
the first 6 strong stations it finds in automatic travel programming  
memory.  
After the stereo stores all six stations in the selected band, it  
tunes to the first station it stored in automatic travel programming  
memory.  
Note: If the stereo could not find any stations, P - 1 - - - appears  
on the display. Press BND or select another station to listen  
to the radio.  
3. Repeatedly press BND until ATP disappears to get out of automatic  
travel programming.  
Selecting a Stored Station  
To select a station you manually stored in AM, FMI, or FMII, repeatedly  
press BND to select the desired memory group, then press the desired  
memory channel button.  
Note: Do not hold down the memory channel button. This stores the  
currently tuned station into that location.  
To select a station you automatically stored in automatic travel  
programming memory, follow these steps:  
1. Repeatedly press BND to select the desired band (AM, FMI, or FMII).  
2. Press ATP for less than 1 second to select the desired memory station.  
Each time you press ATP, the stereo advances to the next memory  
channel.  
Notes: Do not hold down ATP. This causes the stereo to automatically  
scan and store the first 6 strong stations it finds into its  
automatic travel programming memory.  
If the stereo could not find any strong stations, P - x - - -  
(where x is one of the stereo's 6 channel numbers) appears for  
the empty channels.  
Scanning Stored Stations  
The radio can scan all stored stations in the selected band, pausing for 5  
seconds at each station.  
To start scanning stations you manually stored, repeatedly press BND to  
select the desired memory group, then hold down BND until SCN appears.  
To scan the stations in the automatic travel programming memory,  
repeatedly press BND to select the desired band, press ATP so ATP appears,  
then hold down BND until SCN appears.  
As the radio scans each memory channel, P- and the channel number flash  
and the frequency is displayed. After scanning all memory channels, the  
stereo returns to the original station.  
To stop scanning when the radio pauses at a station you want to listen to,  
press BND again during the pause.  
CD PLAYER OPERATION  
CAUTIONS: Play only CDs that have this mark on them: COMPACT  
D I S C  
DIGITAL SOUND  
The CD player has a wide dynamic range. As a result, if you  
turn your stereo's volume up too high during soft (low volume)  
sections of a program, your speakers might be damaged when a  
sudden loud passage occurs.  
If the CD player is jolted during play, the rotation speed  
might suddenly change or the CD player might make an usual  
noise. This is not a malfunction.  
PLAYING A CD  
1. Press ON/OFF to turn on the stereo.  
2. Insert a CD (label side up) in the slot. The stereo automatically  
switches to CD play mode if the radio is playing and displays cd In.  
Then the display shows (CD symbol), cd, and TR01, and the CD starts to  
play from Track 1.  
If a CD is already in the CD player ([CD symbol] appears on the  
display), simply press CD to play the CD. The stereo displays cd, TR,  
and the number of the track you last played, and the CD starts to play  
from the point where you last stopped it.  
After the stereo plays the entire CD, it automatically repeats all  
tracks, starting with Track 1.  
3. Press + or - to increase or decrease the volume as desired.  
Note: See "Adjusting the Sound" above for information about changing  
the stereo's other settings.  
4. To pause playback, press CD. TR and the track number flash. To  
resume play, press CD again.  
Note: If you pause a CD for more then 5 minutes, the stereo turns  
off.  
5. To remove a CD from the CD player, press (symbol). EJ cd appears.  
Notes: If you eject a CD while it is playing and do not remove it from  
the CD player, the stereo automatically draws the CD back in and  
starts playing again after about 5 seconds.  
If you eject a CD then remove it from the CD player, the stereo  
displays no cd (or the current time if you press CLOCK).  
SELECTING A TRACK  
To select a track on the loaded CD, press TUNE/SEEK TRACK (+) during play  
to advance to the next track or TUNE/SEEK TRACK (-) to go back to the  
start of the current track. Repeatedly press TUNE/SEEK TRACK (+) or (-)  
to select the next or previous track.  
AUDIBLE SEARCH  
To search for a particular section of a track, hold down TUNE/SEEK TRACK  
(+) or TUNE/SEEK TRACK (-) during play. The stereo rapidly plays the CD  
either forward or backward (like cueing or reviewing a cassette tape).  
When you hear the section you want, release TUNE/SEEK TRACK (+) or TUNE/  
SEEK TRACK (-) to resume normal play.  
SHUFFLE PLAY  
You can set the stereo to randomly select and play tracks from the loaded  
CD. After each track plays, the stereo automatically selects another  
track and plays it until you stop shuffle play.  
To begin shuffle play, press SHUF/1. SHF appears during shuffle play.  
To stop shuffle play, press SHUF/1 again to resume normal play. SHF  
disappears.  
Note: You can use audible search during shuffle play (see "Audible  
Search" above).  
REPEAT PLAY  
You can set the stereo to repeat a single track on the loaded CD.  
To repeat a track, press RPT/2 during play. RPT appears during repeat  
play. When the track ends, it automatically repeats.  
To stop repeating the track and resume normal play, press RPT/2. RPT  
disappears.  
SCANNING THE TRACKS  
You can set the stereo to play the first 10 seconds of each track on the  
loaded CD, so you can find the track you want to listen to.  
To begin scanning, press SCN/3. SCN appears during scanning.  
To stop scanning, press SCN/3 again at the desired track to resume normal  
play. SCN disappears.  
SWITCHING BETWEEN THE CD AND THE RADIO  
You can temporarily stop a CD and listen to the radio by pressing BND.  
The CD stops and the radio tunes to the last station selected.  
To continue playing the CD from the point where you stopped it, press CD.  
High-Power In-Dash AM/FM Stereo CD Player  
(120-2154/55) Troubleshooting  
Faxback Doc. # 48532  
This document contains instructions for both Cat. No. 120-2154 and  
120-2155 stereos. (You can find the Cat. No. of your model on the top  
of the stereo.) 120-2154 has a LOUD button while 120-2155 has an FSM  
button. Unless otherwise noted, these are the primary differences  
between the two units listed.  
If your stereo's CD player is not working as it should, it displays an  
error indicator. If it is a numbered error, it ejects the CD. Try these  
suggestions.  
Indicator  
E01  
Problem  
Suggestion  
Loading and/or unloading Make sure a CD is  
operation fails.  
loaded. If it is not,  
insert the CD properly.  
If it is, eject the CD  
and load it again.  
E07  
The CD is loading  
incorrectly.  
Reload the CD with the  
label side up.  
The CD is dirty or  
defective.  
Clean the CD (see "CD  
Care Tips" in Faxback  
Doc. # 48533) or try  
another CD.  
no cd  
No CD is loaded.  
Load a CD.  
If the stereo still does not operate properly, the connecting pins in the  
recess or on the back of the control panel might be dirty. Use a soft  
cloth or a contact cleaner (such as Cat. No. 64-4340) to clean them.  
If the stereo still does not operate properly, take it to your local  
RadioShack store for assistance.  
RESETTING THE STEREO  
If your stereo locks up or does not work properly, remove the front panel  
and use a straightened paper clip to press the reset button on the bottom  
left side of the inside panel for about 1 second.  
High-Power In-Dash AM/FM Stereo CD Player  
(120-2154/55) Care and Maintenance  
Faxback Doc. # 48533  
This document contains instructions for both Cat. No. 120-2154 and  
120-2155 stereos. (You can find the Cat. No. of your model on the top  
of the stereo.) 120-2154 has a LOUD button while 120-2155 has an FSM  
button. Unless otherwise noted, these are the primary differences  
between the two units listed.  
Your Optimus High-Power In-Dash AM/FM Stereo CD Player is an example of  
superior design and craftsmanship. The following suggestions will help  
you care for your stereo so you can enjoy it for years.  
Keep the stereo dry. If it gets wet, wipe it dry immediately. Liquids  
might contain minerals that can corrode the electronic circuits.  
Keep the stereo away from dust and dirt, which can cause premature wear  
of parts.  
Handle the stereo gently and carefully. Dropping it can damage circuit  
boards and cases and can cause the stereo to work improperly.  
Wipe the stereo with a damp cloth occasionally to keep it looking new.  
Do not use harsh chemicals, cleaning solvents, or strong detergents to  
clean the stereo.  
Modifying or tampering with the stereo's internal components can cause a  
malfunction, invalidating your stereo's warranty and voiding your FCC  
authorization to operate it. If your stereo is not performing as it  
should, take it to your local RadioShack store for assistance.  
THE FCC WANTS YOU TO KNOW  
Your stereo might cause TV or radio interference even when it is operating  
properly. To determine whether your stereo is causing the interference,  
turn off your stereo. If the interference goes away, your stereo is  
causing it. Try to eliminate the interference by:  
Moving your stereo away from the receiver.  
Contacting your local RadioShack store for help.  
If you cannot eliminate the interference, the FCC requires that you stop  
using your stereo.  
CD CARE TIPS  
Even though a CD is very durable, you should handle it with care. We  
recommend the following precautions.  
Keep the CD in its protective case or sleeve when you are not playing  
it.  
Handle a CD by its edges to avoid fingerprints which can prevent the CD  
player's laser beam from accurately reading the CD. Your local  
RadioShack store sells a suitable CD cleaner kit.  
Do not write on either side of the CD, particularly the non-label side.  
(Signals are read from the non-label side.)  
Keep the CD dry. A water drop can act as a lens and affect the laser  
beam's focus.  
If you park your vehicle in the sun, temperatures inside the vehicle can  
easily reach levels that could damage your CDs. To prevent heat damage,  
avoid leaving your CDs in your vehicle.  
If a CD skips when you try to play it, it might be scratched. Your local  
RadioShack store sells a Scratch 'n Fix kit (Cat. No. 42-127) that might  
help remove the scratch and stop the skip. See also "Troubleshooting" in  
Faxback Doc. # 48532.  
REPLACING A FUSE  
If the stereo does not operate, you might need to replace the red power  
wire's 1-amp 1-1/4 inch fuse with the supplied spare fuse (Cat. No.  
270-1005). If the clock resets or stored stations are lost when the  
ignition is off, you might need to replace the 10-amp blade-type fuse on  
the stereo's back panel with the supplied spare fuse (Cat. No. 270-1081).  
Check both fuses.  
CAUTION: Do not use a fuse with ratings other than those specified here.  
Doing so might damage your stereo.  
Replacing the Red Power Wire's Fuse  
1. Disconnect the cable from your vehicle's negative (-) battery terminal  
2. Push together and twist the fuse holder's parts on the red power wire  
until they spring apart. Then remove the fuse.  
3. If the fuse is brown, replace it. Use only the supplied 1-1/4 inch  
fuse or a replacement fuse with the proper rating (such as Cat. No.  
270-1005). The fuse must be 1 amp.  
4. Reassemble the fuse holder by inserting the fuse into the longer of  
the fuse holder's ends, and pushing together and twisting the two  
parts until they latch together.  
5. Reconnect the cable to the vehicle battery's negative (-) terminal.  
Replacing the Blade-Type Fuse  
1. Disconnect the cable from your vehicle's negative (-) battery terminal  
2. If the back of the stereo is not accessible, remove the stereo from  
the dash as described in "Removing the Stereo From the Dash" in  
Faxback Doc. # 48529.  
3. Grasp the fuse's plastic end and pull it out.  
4. If the fuse is blown, replace it. Use only the supplied blade-type  
fuse or a replacement fuse with the proper rating (such as Cat. No.  
270-1081). The fuse must be 10 amps.  
5. Grasp the new fuse's plastic end and push it in.  
6. If necessary, reinstall the stereo in the dash.  
7. Reconnect the cable to the vehicle battery's negative (-) terminal.  
High-Power In-Dash AM/FM Stereo CD Player  
(120-2154/55) Specifications  
Faxback Doc. # 48534  
This document contains instructions for both Cat. No. 120-2154 and  
120-2155 stereos. (You can find the Cat. No. of your model on the top  
of the stereo.) 120-2154 has a LOUD button while 120-2155 has an FSM  
button. Unless otherwise noted, these are the primary differences  
between the two units listed.  
RADIO:  
FM (Nominal)  
AM (Nominal)  
Frequency Range: ................. 88-108 MHz ............... 530-1710 kHz  
Frequency Response (+/-3 dB): .... 50-12500 Hz ....................... N/A  
IF Rejection: ...................... 85 dB ......................... 40 dB  
Image Rejection: ................... 60 dB ......................... 25 dB  
Selectivity: ....................... 66 dB ........................ 100 dB  
Signal-to-Noise (S/N) Ratio: ....... 60 dB ......................... 49 dB  
Stereo Separation: ................. 30 dB ........................... N/A  
Usable Sensitivity: ................ 17 dB ......................... 29 dB  
CD PLAYER:  
Frequency Response: ........................................... 5-20000 Hz  
Signal-to-Noise Ratio: ............................................. 65 dB  
Harmonic Distortion: .............................................. 0.08 %  
Wow and Flutter: .......................................... Not Measurable  
CDs Used (Diameter): .................. 5-inch (120 mm) and 3-inch (80 mm)  
SIGNAL FORMAT:  
D-A Conversion: ............................................. 1 Bit Linear  
Transmission Bit Rate: ...................................... 1.4 Mbit/sec  
Sampling Frequency: .............................................. 8 times  
Pick-Up System: ......................................... Optional Pick-Up  
Optical Source: .................................................... Laser  
Wavelength: ....................................................... 785 nm  
Rotation Speed: .............................................. 200-500 rpm  
Error Correction: ................................................... CIRC  
Number of Channels: ..................................... 2-channel stereo  
GENERAL:  
Power Source: ..................................... 12V DC Negative Ground  
Speaker Output Impedance: ......................................... 4 Ohms  
Maximum Power: ................. 25 Watts x 2CH or 6 Watts x 4CH (12-2154)  
25 Watts x 4CH (12-2155)  
Power Output (RMS): ............ 16 Watts x 2CH or 4 Watts x 4CH (12-2154)  
16 Watts x 4CH (12-2155)  
Chassis Size (HWD): ............................ 2.28 x 7.40 x 7.08 Inches  
(58 x 188 x 180 mm)  
Weight: ................................................. 52.9 oz (1.5 kg)  
Specifications are typical; individual units might vary. Specifications  
are subject to change and improvement without notice.  
(LB/eb 6/29/98)  
LN-03/04  

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