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Is it normal for Zhongying nx500 to print electronic invoices on a4 paper with incomplete fonts?

Not normal.

1. First, let the printer self-check to determine whether there is a hardware fault in the printer itself.

2. Secondly, carry out all kinds of cleaning work to check whether there is any problem with the application itself.

3. Finally, if it still doesn't work, replace the ink cartridge for testing.