In order to quickly determine the fault site, communicate with a normal fax machine experiments, the results show that, when it is received, can connect to each other, but after a few seconds, makes a warning sound inside the machine, the error indicator lights up. Therefore failures in the demodulation error or Panel function settings of your modem. According to Jane after the first propagation of principles, first reset the parameters associated with receiving, but the LCD display error, unable to enter the settings for the normal state, suspected static memory error. Based on experience, this part of the circuit was an error, first to reset the system and maintenance. The reset switch RESET SWITCH located in the bottom of the motherboard of the machine. Under normal conditions, press this button, the system can be reset. But this machine after you press this button, symptoms are not changing, this system stored procedure error. Removed retain memories with a lithium-ion battery, placed after half an hour, then put inside a machine, press the RESET SWITCH button, enter the initialization state of the system, reset the fax parameter, it recovers.