Hello JiH,
The transfer belt in the LBP was not designed to be removed and cleaned manually. If the transfer belt is dirty, you can try cleaning it using the steps provided in the link HERE. If cleaning the transfer belt this way does not resolve your issue, you can also try cleaning the fixing assembly using the steps in the link HERE.
If performing the cleanings from the menu does not improve your print quality, it will mean the printer needs service. You can contact our support team over the phone at 1-800-652-2666. They will be able to provide additional support and provide any service options.
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