HP LaserJet 4250 Service Manual - Page 153
Stacker, Stacker feed and delivery
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Stacker The dc controller PCA controls the stacker and sends signals to the stacker-driver PCA. The stackerdriver PCA then controls the operation of the stacker components such as the stacker motor, solenoid, and sensors. When the printer power is turned on, dc power from the printer low-voltage supply circuit is supplied to the stacker. The stacker performs the power-on sequence and enters the standby mode. When it receives a signal from the dc controller PCA, the stacker-driver PCA activates the motors and solenoids as needed to perform the stack operation. Stacker feed and delivery The stacker feed-and-delivery system consists of several feed rollers and guides that the stacker motor and solenoids drive. Sensors along the stacker paper path detect the arrival and passing of media and confirm the position of the jogger guide. The jogger guide helps to align the pages before placing them in the delivery bin. Table 5-5 Stacker components Component Motor Solenoid Sensor Switch Feed motor (M103) Deflector solenoid (SL1101) Paper-inlet sensor (PS1101) Paper-delivery sensor (PS1102) Delivery paper-full sensor (PS1106) Door-open switch (SW1101) Purpose Rotates the feed and delivery roller Operates the delivery deflector Detects jams Detects jams Detects that the delivery bin is full Detects an open door After the leading edge of the media reaches the fuser delivery sensor (PS108) in the printer, the dc controller PCA sends a signal to the stacker-driver PCA. The stacker-driver PCA activates the deflector solenoid (SL101) for a specific amount of time to move the delivery deflector into place to route the media to the stacker rather than to the top output bin. The stacker-driver PCA also activates the stacker motor (which rotates at the same speed as the printer main motor) to rotate the feed and delivery rollers. The feed roller moves the media into the stacker. If the dc controller PCA sends a following-page signal (which indicates that the job contains another page), the stacker-driver PCA activates the deflector solenoid (SL101) again. The delivery roller moves the media into the delivery bin. Stacker and stapler/stacker 139