HP M750 series

The paper feeder controller PCA determines a PF lifter motor failure and notifies the formatter through the
DC controller when the PF paper-stack surface sensor does not detect the stack surface within a specified
period after the PF lifter motor starts rotating.
Figure 1-52 Paper-feeder cassette lift operation
M2
SR2
SR3
Lifter
Lifting plate
PF lifter motor
PF media stack surface flag
PF cassette media presence sensor flag
PF media stack surface sensor
PF cassette media presence sensor
Paper-feeder jam detection
The paper feeder uses the PF paper-feed sensor (SR1) to detect the presence of print-media and to check
whether print-media is being fed correctly or has jammed.
Figure 1-53 Paper-feeder jam detection
SR1
Paper feeder 1
The paper feeder detects the following jams:
PF pickup delay jam The PF paper-feed sensor does not detect the leading edge of paper within a specified period,
including a retry, after the PF pickup solenoid is turned on.
PF residual paper jam The PF paper-feed sensor detects a presence of paper when the printer is turned on, when the door
is closed or when the automatic delivery is performed.
PF door open jam A door open is detected during paper-feed operation.
ENWW Paper feeder 71