从左到右，从上到下依次按机器按键进行按键测试，同时注意听蜂鸣器的声音以

From left to right, press the machine buttons in sequence from top to bottom to perform the button test. At the same time, pay attention to the sound of the buzzer and whether the power light is on. The corresponding button number on the screen disappears in turn. After the test, it will automatically enter the interface as shown in Figure 5. Manual Judging the buzzer test, press the "Confirm" key to judge the test success, and press the "Cancel" key if the test fails, as shown in Figure 5, and enter the magnetic card test after the test is successful.

Press the machine keys from left to right and from top to bottom to test the keys. At the same time, pay attention to the sound of the buzzer and whether the power light is on. The corresponding key tag numbers on the screen disappear in turn. After the test, automatically enter the interface in Figure 5. Manually judge the buzzer test, judge the success of the test, and press the "confirm" key. If the test fails, press the "Cancel" key, as shown in Figure 5, After the test is successful, enter the magnetic card test.

From left to right and from top to bottom, press the machine keys in turn to test the keys. At the same time, pay attention to the sound of the buzzer and whether the power light is on. The corresponding key numbers on the screen disappear in turn. After the test, you will automatically enter the interface of Figure 5, manually judge the buzzer test, and press the "Confirm" button to judge the success of the test. If the test fails, press the "Cancel" button, as shown in Figure 5. After the test is successful, you will enter the magnetic card test.