White spots or hollow print
![White spots or hollow print](/g/b/img/faqend/faq00000011_035/eu_ot/en/21703/08_hollow.gif)
Check the following points to resolve the issue:
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Make sure that the media type setting in the printer driver matches the type of paper you are using.
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Check the machine's environment. Conditions such as high humidity can cause hollow print.
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If the problem is not solved after printing a few pages, foreign material, such as glue from a label, may be stuck on the drum surface.
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Install a new drum unit. Click here to see the details of how to replace the drum unit.