HP LaserJet 4250 Service Manual - Page 156
Stapler/stacker, Stapler/stacker feed and delivery
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Stapler/stacker The dc controller PCA controls the stapler stacker by sending signals to the stapler/stacker PCA. The stapler/stacker PCA controls the stapler/stacker motor, solenoids, sensors, and the stapler unit. When the printer power is turned on, the printer low-voltage supply circuit supplies dc power to the stapler/stacker. The stapler/stacker performs the power-on sequence and enters the standby mode. When the dc controller PCA sends a signal, the stapler/stacker-driver PCA activates the motors and solenoids as needed to perform the staple-and-stack operation. Stapler/stacker feed and delivery The stapler/stacker feed and delivery system consists of several feed rollers and guides that the stapler/stacker motors and solenoids drive. Sensors along the stapler/stacker paper path detect the arrival and passage of media and confirm the position of the jogger guide. The jogger guide helps to align the pages before stapling and dropping them into the delivery bin. The stapler/stacker has two modes. The staple mode staples sheets together and drops them into the delivery bin. The stack mode drops the sheets directly into the delivery bin without stapling them together. Table 5-6 Stapler/stacker components Component Motor Paddle motor (M1101) Purpose ■ Rotates the paddle (clockwise) ■ Disengages the delivery roller (counterclockwise) Jogger motor (M1102) Shifts the jogger guide. ■ Widens the jogger guide (clockwise) ■ Narrows the jogger guide (counterclockwise) Solenoid Sensor Switch Feed motor (M103) Stapler motor (M1104) Deflector solenoid (SL1101) Clamp solenoid (SL1102) Paper-inlet sensor (PS1101) Paper-delivery sensor (PS1102) Paddle home-position sensor (PS1103) Delivery-roller disengaging sensor (PS1104) Jogger home-position sensor (PS1105) Delivery paper-full sensor (PS1106) Door-open switch (SW1101) Rotates the feed and delivery rollers Rotates the staple cam Operates the delivery deflector Operates the stapler clamp Detects jams Detects jams Detects whether the paddle is in the home position Detects the disengaging the delivery roller Determines whether the jogger guide is in the home position Detects a full delivery bin Detects an open door 142 5 Theory of operation