The CPU on the Engine Controller Board monitors the conditions of the PS102 for a prescribed period of time after the pickup starts. If the PS102 does not detect paper within that time interval, the CPU turns off the Feed Roller clutch (CL101) to stop the paper after the top of page sensor (PS103) detects the presence of the preceding page. The paper then reaches the Registration Arm, where its skew is corrected. Then it goes through transfer, separation, and fusing stages, passes through the delivery unit, and is delivered to the output bin. Figure 5-28 Paper Feed Pickup Paper Feed System 5-43