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At top rear, after paper leaves toner cartridge and turns up to go out eject port, paper is tightly jammed in the channel. Have been able to remove some of the jammed paper, but only in very small pieces. Cannot find how to open the cartridge-to-port channel so I can more easily and fully remove the paper.

Hi Frederick, In Google search type: hp laserjet 1200 service manual pdf and you will get a pdf of the service manual. Read through it and you will find the answer to your question.