User manual SONY XM-4040

[. . . ] Direct connection can be made with the speaker output of your car audio if it is not equipped with the line output (High level input connection). * Protection circuit This amplifier is provided with a protection circuit that operates in the following cases: -- when the unit is overheated -- when a DC current is generated -- when the speaker terminals are short circuited. The colour of the POWER/PROTECTOR indicator will change from green to red, and the unit will shut down. If this happens, turn off the connected equipment, take out the cassette tape or disc, and determine the cause of the malfunction. [. . . ] If this happens, turn off the connected equipment, take out the cassette tape or disc, and determine the cause of the malfunction. If the amplifier has overheated, wait until the unit cools down before use. ** Pulse power supply This unit has a built-in power regulator which converts the power supplied by the DC 12 V car battery into high speed pulses using a semiconductor switch. These pulses are stepped up by the built-in pulse transformer and separated into both positive and negative power supplies before being converted into direct current again. This light weight power supply system provides a highly efficient power supply with a low impedance output. Choose the mounting location carefully so the unit will not interfere with the normal movements of the driver and it will not be exposed to direct sunlight or hot air from the heater. Do not install the unit under the floor carpet, where the heat dissipation from the unit will be considerably impaired. First, place the unit where you plan to install it, and mark the positions of the four screw holes on the mounting board (not supplied). Then drill a 3 mm pilot hole at each mark and mount the unit onto the board with the supplied mounting screws. The mounting screws are all 15 mm long, so make sure that the mounting board is thicker than 15 mm. Install the input and output cords away from the power supply lead as running them close together can generate some interference noise. Therefore, it may not perform to its full potential if used with the speaker cords supplied with the car. If your car is equipped with a computer system for navigation or some other purpose, do not remove the ground wire from the car battery. To avoid short circuits when making connections, disconnect the +12 V power supply lead until all the other leads have been connected. Note Make sure that the line output from the car audio is connected to the jack marked "L (BTL)" on the unit. Turn on or off the LPF and HPF switch at the unit rear as illustrated below. Note When you tighten the screw, be careful not to apply too much torque* as doing so may damage the screw. * The torque value should be less than 1 N· Pass the leads through the cap, connect the leads, then cover the terminals with the cap. * If you have the factory original or some other car audio without a remote output on the amplifier, connect the remote input terminal (REMOTE) to the accessory power supply. Connect the +12 V power supply lead only after all the other leads have been connected. [. . . ] * If you have the factory original or some other car audio without a remote output on the amplifier, connect the remote input terminal (REMOTE) to the accessory power supply. Connect the +12 V power supply lead only after all the other leads have been connected. Be sure to connect the ground lead of the unit securely to a metal point of the car. Be sure to connect the remote control lead of the car audio to the remote terminal. [. . . ]