User manual SONY XM-2040

[. . . ] Do not attempt to test the protection circuits by covering the heat sink or connecting improper loads. Do not use the unit on a weak battery as its optimum performance depends on a good power supply. For safety reasons, keep your car audio volume moderate so that you can still hear sounds outside your car. When replacing the fuse, be sure to use one matching the amperage stated above the fuse holder. [. . . ] * 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 POWER/PROTECTOR indicator lights up in 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 the amplifier has overheated, wait until the unit cools down before use. If you have any questions or problems concerning your unit that are not covered in this manual, please consult your nearest Sony dealer. When the PROTECTOR is activated the indicator will change from green to red. 4 LEVEL adjustment control The input level can be adjusted with this control. Turn it in the clockwise direction when the output level of the car audio seems low. 5 LOW BOOST level control Turn this control to boost the frequencies around 40 Hz to a maximum of 10 dB. Refer to these numbers whenever you call upon your Sony dealer regarding this product. The following checklist will assist in the correction of most problems which you may encounter with your unit. If you connect more than three amplifiers, it may cause problems such as sound dropout. Pass the wires through the cap, connect the wires, then cover the terminals with the cap. 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· " Note Make sure that the line output from the car audio is connected to the jack marked "L (BTL)" on the unit. When using passive crossover networks in a multispeaker system, care must be taken as the speaker system's impedance should not be lower than that of the suitable impedance for this unit. When you are installing a 12 decibels/octave system in your car, the following points must be considered. In a 12 decibels/octave system where both a choke and capacitor are used in series to form a circuit, a great care must be taken when they are connected. In such a circuit, there is going to be an increase in the current which by-passes the speaker with frequencies at around the crossover frequency. If audio signals are continued to be fed into the crossover frequency area, it may cause the amplifier to become abnormally hot or the fuse will be blown. also if the speaker is disconnected , a series-resonant circuit will be formed by the choke and the capacitor. [. . . ] also if the speaker is disconnected , a series-resonant circuit will be formed by the choke and the capacitor. In this case, the impedance in the resonance area will decrease dramatically resulting in a short circuit like situation causing a damage to the amplifier. Therefore, make sure that a speaker is connected to such a circuit at all times. * 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. [. . . ]