Amplifier power supply without any instructions, press the power button nothing happens, indication lamp does not light. Power detection: 220 v AC to enter, equal power output 12 v and 10 v, with cable JL901B to Board, detect CPU voltage of 5 volts is normal. Arrangement of JL901B is: 1.P OFF 2.+12V. 3.GND. 4.+10S. 5.POWERD. p OFF power control. Based on user response, bought this machine for over two years has been rarely used, but hasn't been inserted power plug, this machine does not have AC switch, boot from the boot check of machine parts, combined with the humid air in the Southwest has been the cause of many failures of labor.Wqkservice manual download site
Wqkservice manual download site
Carefully observe the machine free of corrosion, bulging. Measure all the key there is no short circuit and leakage. As a result only from the CPU to start measurement, the CPU Model: M30624MHP-B06FP. Located on the decoding Board radiator end amplifier CPU working elements include: operating voltage, crystal oscillator and reset voltage, voltage detection. Measure the PIN found that 12 PIN reset voltage only 1.2 volts, normally should be 5 volts, people-connect 5 volts to 12 feet, and boot normally. Check Q601 leakage reduction circuit, replacing the normalWqkservice manual download site