Optimus 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.

Locking Fast Forward - quickly fast-forwards the cassette tape with the
touch of a button.

Advanced FM Optimizer Circuitry - Automatically adjusts the tuner's stereo
separation and high-frequency response
regardless of the signal level, giving
you the best possible sound.

Built-In Noise-Suppression Choke - reduces the noise caused by your
vehicle's electrical system.

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.