This giant 12V car amplifier. I meet for the first time, from repeatedly burned 15A insurance must be something serious short circuits. Disassemble observe the circuit board, left and right channel power amplifier tube A1216 C2922 (180V 17A 200W) symmetric fixed on the casing. 12V boost around +48V,dianyuan with left-channel power amplifier power switch and rectifier tubes fixed on one side of the tube. To facilitate the analysis of circuits. Part real primary circuit pressure out. As shown in figure.eyZservice manual download site
eyZservice manual download site
According to the circuit soon discovered to be the boost tube breakdown, IRFZ44 alternative. Plus 12Vdianyuan power, native 15A insurance no longer burning, but in my regulated Dianyuan power supply transformer makes a lot of "huh" sound, busy shutting down, touch the top tube and down tube are very hot, cooling power for a short time after logging sub V+/-rises immediately disappear; 12Vdianyuan power measurement has become 7V, busy shutting down. From the above analysis. Boost circuit AC component is not working properly.eyZservice manual download site
eyZservice manual download site
Since the secondary voltage increases then amplifier section has not V+/-short circuit, +/-power supply the amplifier section for insurance purposes a 0.5A fuse, again connected to the 12Vdianyuan power, as previously confirmed that "failed" part in boosting exchanges. After some difficulty to find "fault" reasons for booster secondary short circuit, remove the coil after repeatedly rocking, dipping again, light bulbs and dry them. After that everything works on, remove the two 0.5A insurance in larger volume under test. Boost tubes were only two warm, while the left and right channels and power tube is relatively hot, indicating the working efficiency of the switches is still very high, also shows that IRFZ44 is a strong ability to adapt to the boost tube.eyZservice manual download site