You can judge whether the nozzle of a digital inkjet printer needs to be cleaned from the following aspects:

I. Print quality

1. Discontinuous lines: If the printed lines are intermittent, it may be that some nozzle holes are clogged and need to be cleaned. For example, when printing lines in a chart or document, the straight lines that should have been continuous become discontinuous lines composed of several small segments.

2. Missing or uneven colors: When the printed pictures or documents are missing colors, such as the part that should have been red becomes light red or even white, or the color distribution is uneven, with obvious color difference, stripes, spots, etc., this may be caused by nozzle blockage or poor ink supply. At this time, you need to consider cleaning the nozzle. For example, when printing a color photo, a clear color difference area appears on the face of the person.

3. Blurred or ghosting: The printed content is blurred or ghosting occurs, which may be due to poor nozzle status. For example, when printing text, the edges of the characters are blurred and difficult to recognize, or multiple shadows appear on the same character.

2. Printing process

1. Slow printing speed: If the printer is significantly slower than usual during printing, it may be that the nozzle is blocked and the ink jet speed is affected. For example, it usually takes only a few seconds to print a page of a document, but now it takes dozens of seconds or even longer.

2. Frequent disconnection alarms: If the printer frequently has disconnection alarms during operation, it means that the nozzle may be blocked or have other problems and needs to be cleaned.

3. Equipment status

1. Long-term non-use: If the printer has not been used for a long time, the ink in the nozzle may dry up and easily cause blockage. For example, if the printer has not been used for more than a month, you need to check the nozzle status and consider cleaning it when you use it again.

2. After changing the ink: After changing the ink of different brands or models, in order to prevent the nozzle from being blocked due to compatibility issues between the inks, it is best to clean the nozzle once.