User manual SONY XM-5026

[. . . ] * (XM-4026) ** 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 is to regulate fluctuating voltage from the car battery. This light weight power supply system provides a highly efficient power supply with a low impedance output. [. . . ] â· Do not install the unit under the floor carpet, where the heat dissipation from the unit will be considerably impaired. Firstly, place the unit where you plan to install it, and mark the positions of the four screw holes on the surface of the mounting board (not supplied). Then drill the holes whose diameter should be approximately 3 millimeters (mm) and mount the unit onto the board with the supplied mounting screws. the supplied mounting screws are 15 mm long. Therefore, make sure that the mounting board is thicker than 15 mm. After all the connections are completed, place the cover on the unit with the supplied screws as shown below. The following checklist will assist in the correction of most problems which you may encounter with your unit. Before going through the checklist below, refer to the connection and operating procedures. The ground lead is not securely connected. n Fasten the ground lead securely to a metal point of the car. The voltage going into the remote terminal is too low. â· The connected master unit is not turned on. The power connecting leads are installed too close to the RCA pin cables. The ground lead is not securely connected. Before making any connections, disconnect the ground terminal of the car battery to avoid short circuits. â· Be sure to use speakers with an adequate power rating. If you use small capacity speakers, they may be damaged. â· Do not connect the ' terminal of the speaker system to the car chassis, and do not connect the ' terminal of the right speaker with that of the left speaker. [. . . ] 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. [. . . ]