HP Color LaserJet CM4730 Service Manual - Page 226
Reversing unit jam 1, Duplexing pickup unit jam 1, Automatic delivery function
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Reversing unit jam 1 If the paper reversing sensor (SR8001) does not detect the leading edge of the media within a specified period after the duplexing driver receives a reversing command from the MFP, the microprocessor on the DC controller PCB determines that a reversing unit jam 1 has occurred. The transport process stops and a jam message appears on the product control panel display. Reversing unit jam 2 If the paper reversing sensor (SR8001) continues to detect media for a specified period after it initially detects the media, the microprocessor on the DC controller PCB determines that a reversing unit jam 2 has occurred. The transport process stops and a jam message appears on the product control panel display. Duplexing pickup unit jam 1 If the top-of-page sensor (SR12) fails to detect the leading edge of media within the specified period after the duplexing driver receives a duplexing pickup command from the MFP, the microprocessor on the DC controller PCB determines that a duplexing pickup unit jam 1 has occurred. The transport process stops and a jam message appears on the product control panel display. Automatic delivery function Any residual paper within the MFP is automatically delivered when the power is turned on or when printing starts. If the top-of-page sensor (SR12) detects paper during the WAIT period, the DC controller PCB detects that residual paper is present, notifies to the formatter, and stops printing. The controller drives the motors and delivers the residual paper to the MFP when it receives an automatic delivery command from the formatter. 206 Chapter 4 Theory of operation ENWW
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