This situation has a variety of problems: you have to use the elimination of the law can ah!
First: Hold down the "Start" button when 4 lights are flashing, if this is the machine's "toner" Light indicating machine fixing unit failure. The machine has entered the automatic protection mode. Allows the user to shut down the machine for half an hour and then reboot, at this time the machine is still 4 lights flashing, please wait for 15 minutes, the printer will automatically start (if 15 minutes after the start can be directly press the "Start" button) if or is not valid; it may be a consumable failure and printer hardware failure;
Second: You first exclude your supplies are the original supplies are good, you can directly explain the machine hardware failure;
Third: You can open the machine to check, look at the machine's laser, the motherboard wiring is wrong AH! Make sure the wiring is correct. Went into
Fourth step: You hold the Start button, look at the light, you to the picture ah;
There are 2 possibilities for this failure in addition to a hardware failure:
1. The printer enters the protection mode because the fixing temperature is abnormal (not meet or exceed the specified temperature) due to the power supply.
2. Due to external interference caused by the printer to the fixing temperature error, the printer into the protection mode motherboard failure