HP Color LaserJet CM4730 Service Manual - Page 240
IPTU jam detection, Pickup delay jam, Pickup stationary jam, Delivery delay jam
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IPTU jam detection The IPTU is equipped with paper detection sensors to detect the presence of paper and to determine operational status: ● Top of page sensor (SR8301) ● Delivery sensor (SR8302) The CPU on the IPTD PCB determines a paper jam by checking whether paper is present at the sensors at the checking timing. The checking timing is stored in the memory of the CPU. If the CPU determines a jam, it stops the intermediate paper transfer operation and notifies the MFP of the jam. Pickup delay jam The CPU determines a pickup delay jam when the top-of-page sensor (SR8301) does not detect the paper within the specified period after the cassette pickup solenoid (SL2) or the MP tray pickup solenoid (SL1) is turned ON. Pickup stationary jam The CPU determines a pickup stationary jam when the top-of-page sensor (SR8301) does not detect the trailing edge of the paper within the specified period after the top-of-page sensor (SR8301) detects the leading edge. Delivery delay jam The CPU determines a delivery delay jam when the delivery sensor (SR8302) does not detect the leading edge of the paper within the specified period after the top-of-page sensor (SR8301) detects the trailing edge. Delivery stationary jam The CPU determines a delivery stationary jam when the delivery sensor (SR8302) does not detect the trailing edge of the paper within the specified period after the top-of-page sensor (SR8301) detects the trailing edge. 3-bin mailbox system When the 3-bin mailbox (MBM) is installed, it receives print media from the print engine and delivers it to one of its three bins. The 3-bin mailbox has the following components: ● One feed motor that drives the rollers ● Two solenoids that operate the inlet deflector and the bin deflector ● Six sensors that detect the presence of print media and the stack height in the output bins ● One switch that determines whether the 3-bin mailbox is attached to the MFP correctly ● One fan that cools components inside the 3-bin mailbox The 3-bin mailbox has three operating modes: stacker mode, mailbox mode, and function-separator mode. The MBM-driver PCA controls all functions in the 3-bin mailbox. To deliver media to the different bins, the inlet deflector and the bin deflector change position as required. 220 Chapter 4 Theory of operation ENWW