HP LaserJet 5000 Service Manual - Page 131

Reversing System The duplexing driver PCA receives the duplex admission command from the printer first. It turns on the Duplexer deflector drive solenoid (SL1701), and the Duplexer deflector in the printer then starts to send the paper into the Duplexer. Within a specified period of time after receiving the command, the duplexing driver PCA also drives the reversing motor (PM1701) in straight rotation, and the reversing rollers 1, 2, and 3 in XX direction. Therefore, the paper is fed in XX direction (shown in the figure below). Figure 5-23 Duplexing Unit Within a specified period of time after the trailing edge of the paper is detected with the reversing unit paper sensor (PS1701), the duplex driver PCA pauses the rotation of the reversing motor (PM1701). The duplex driver PCA then switches the reversing motor (PM1701) to reverse rotation. As the paper is fed along the feed guide, it is fed through the reversing roller 4 and the feed roller 1 of the Duplexer. 5-40 Functional Information EN