([First ensure that the printer enters the repair mode] 1. Turn off the printer power. 2. Press and hold the paper feed key (the key below the power supply), and then turn on the power supply (press and hold the power supply key). 3. Then release the paper feed key, press the paper feed key five times in succession, and release the power key. 4. When the machine starts to run, wait until the power light stops flashing and the power light turns green.)
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