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2. Common problems and troubleshooting methods
1. Some or all of the buttons are not working well
1.1 Uncover the upper case of the electronic watch and test
whether the buttons are working
；
1.2 Check or replace the electronic board
；
1.3 Check the button can be worked after the power is turned back
on .
2. The electronic watch has no display
Troubleshooting methods
：
2.1Check if the input voltage is within the allowable range
：
AC
200-240V
；
2.2 Check if the switch on the electric running machine is turned
on.
；
2.3 Check if the fuse inside the power outlet is blown. If it is blown,
replace it with a spare fuse
；
2.4Check the controller, if LED is lit
；
2.5Check each cable
；
2.6Check or replace the electronic board
；
2.7Check or replace control board.