User manual SONY XM-423SL

[. . . ] Choose the mounting location carefully so that the unit will not interfere with the normal movements of the driver, and so 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 surface of the mounting board (not supplied). [. . . ] The ground lead is not securely connected. One or more of the switches is settled between settings (i. This unit is designed for negative ground 12 V DC operation only. Do not connect any active speakers (with built-in amplifiers) to the speaker terminals of the unit. Doing so may damage the active speakers. Avoid installing the unit where: -- it would be subject to high temperature such as from direct sunlight or hot air from the heater. -- it would be exposed to rain or moisture. If your car is parked in direct sunlight and there is a considerable rise in temperature inside the car, allow the unit to cool down before use. When installing, be sure not to cover the fins with the floor carpet, etc. If no power is being supplied to the master unit, check the connections. This power amplifier employs a protection circuit* to protect the transistors and speakers if the amplifier malfunctions. 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. [. . . ] there are two basic types illustration A and B. You may need to switch the positions of the red and yellow leads in the car stereo's power connecting cord. After matching the connections and power supply leads correctly, connect the unit to the car's power supply. [. . . ]