JVC KD-R303 Connecting the external amplifier or subwoofer, Preparation, Warnings, Installation

Heat sink

PREPARATION

This unit is designed to operate on 12 V DC, NEGATIVE ground electrical systems. If your vehicle does not have this system, a voltage inverter is required, which can be purchased at JVC car audio dealers.

WARNINGS

To prevent short circuits, we recommend that you disconnect the battery’s negative terminal and make all electrical connections before installing the unit.

• Be sure to ground this unit to the car’s chassis again after installation.

Notes:

•Replace the fuse with one of the specified rating. If the fuse blows frequently, consult your JVC car audio dealer.

•It is recommended to connect to the speakers with maximum power of more

than 50 W (both at the rear and at the front, with an impedance of 4 Ω to 8 Ω). If the maximum power is less than 50 W, change “AMP GAIN” setting to prevent the speakers from being damaged (see

“Menu operations”).

• To prevent short-circuit, cover the terminals of the UNUSED leads with insulating tape.

• The heat sink becomes very hot after use. Be careful not to touch it when removing this unit.

TROUBLESHOOTING

•The fuse blows.

*Are the red and black leads connected correctly?

• Power cannot be turned on.

*Is the yellow lead connected?

•No sound from the speakers.

*Is the speaker output lead short-circuited?

• Sound is distorted.

*Is the speaker output lead grounded?

*Are the “–” terminals of L and R speakers grounded in common?

• Noise interfere with sounds.

*Is the rear ground terminal connected to the car’s chassis using shorter and thicker cords?

•This unit becomes hot.

*Is the speaker output lead grounded?

*Are the “–” terminals of L and R speakers grounded in common?

• This unit does not work at all.

*Have you reset your unit?

INSTALLATION / CONNECTION

Parts list for installation and connection

Å Control panel	1	‰ Washer (ø5)	1	È Handles	2
ı Sleeve	1	Ï Lock nut (M5)	1	Ô Remote controller	1
Ç Trim plate	1	Ì Mounting bolt—M4 x 5 mm (M4 x 1/4"); M5 x 12.5 mm (M5 x 1/2") ....	1	 Battery	1
Î Power cord	1	Ó Rubber cushion	1

INSTALLATION

The following illustration shows a typical installation. If you have any questions or require information regarding installation kits, consult your JVC car audio dealer or a company supplying kits.

• If you are not sure how to install this unit correctly, have it installed by a qualified technician.

In dash-mounting

ELECTRICAL CONNECTIONS

Typical connections

Before connecting: Check the wiring in the vehicle carefully. Incorrect connection may cause serious damage to this unit. The leads of the power cord and those of the connector from the car body may be different in color.

1Connect the colored leads of the power cord in the order specified in the illustration below.

2Connect the antenna cord.

3Finally connect the wiring harness to the unit.

When you stand the unit, be careful not to damage the fuse on the rear.

Do the required electrical connections.

Bend the appropriate tabs to hold the sleeve firmly in place.

Removing the unit

Rear line out	Rear ground terminal
Antenna		15 A fuse
terminal
		Black	To the metallic body
Use the front speaker lead if your speaker			or chassis of the car
system is two-speaker system.
			To a live terminal in the
White with black stripe		Yellow *2	fuse block connecting
			to the car battery
			(bypassing the ignition
Front speaker	White		switch) (constant 12 V)
(left)
Gray with black stripe		Red	To an accessory terminal

in the fuse block

Ignition switch

Fuse block

Before removing the unit, release the rear section.

Front speaker	Gray
(right)		Blue with white
	Green with black stripe
		stripe	To the remote lead of other equipment or
			automatic antenna if any (200 mA max.)
Rear speaker	Green
(left)	Purple with black stripe
Rear speaker	Purple
(right)
	Connecting the external amplifier or subwoofer
			Remote lead	Y-connector *1

When using the optional stay

Fire wall Stay (option)

Dashboard

Screw (option)	Install the unit at an angle of less
	than 30˚.

When installing the unit without using the sleeve

In a Toyota car for example, first remove the car radio and install the unit in its place.

Flat type screws—M5 ⋅ 8 mm (M5 ⋅ 3/8")*			* Not supplied for this unit.
Bracket*
		Flat type screws
Pocket	Bracket*	—M5 ⋅ 8 mm (M5 ⋅ 3/8")*

			Remote lead (blue with white stripe)
			To the remote lead of
	JVC Amplifier		other equipment or
			automatic antenna
Rear		Signal cord *1	if any
speakers
			Front speakers
*1	Not supplied for this unit.
*2	Before checking the operation of this unit prior to installation, this lead must be connected, otherwise the power cannot
	be turned on.
*3	Firmly attach the ground wire to the metallic body or to the chassis of the car—to the place uncoated with paint (if
	coated with paint, remove the paint before attaching the wire). Failure to do so may cause damage to the unit.

PRECAUTIONS on power supply and speaker connections

4 – EN