The machine has a maximum volume preset function, in line with the principles of the first software to check the hardware. The maximum sound volume can be operated by remote control by default phone, the specific method is: press "MENU" button to press the green button I press a red button to select "Store" and press the green button to select "Volume", the digital display on the screen in this case, represents the maximum volume of data, press the blue button (+) or yellow button (-) to adjust the size of the value, the general should be adjusted in the "100." This value before the machine is adjusted to a small value, which was raised to "100", press the "MENU" button to exit the volume back to normal.p62service manual download site