Adjust the volume of this machine, measuring AN5270 voltage change, (4) feet of volume control circuit is normal. Adjust the volume to maximum, hand-held metal screwdriver touch AN5270 (2) the feet, no reactions in the speaker, to show that the failure of AN5270 and its peripheral circuits. Xs2service manual download site
 Xs2service manual download site
With different AN5270 multimeter voltage, in addition to (1), (9) feet basic normal power supply voltage, the rest of the foot and normal have larger deviation, judge AN5270 damage. Replace a new AN5270 sound back to normal. Xs2service manual download site
 Xs2service manual download site
 Xs2service manual download site
Commissioning after a period of time back to the user. After a few weeks, the user to send again, or no audio fault, examined AN5270 damage again. Check AN5270 external components are normal, thought it was replaced by AN5270 has poor quality, and changing a new AN5270 sound back to normal. And several weeks, AN5270 damaged again, that means AN5270 peripheral components have the problems have not been found. AN5270 peripheral components one by one will be removed, measured with a multimeter, no obvious faults. Considering the unstable resistors, capacitors, damage or the performance of the capacitance bastardize the multimeter can not check it out. So will all AN5270 peripheral components replacement, and then put on a new AN5270, sound recovery. Users are using more than one year, error no longer reproduce.Xs2service manual download site