Service manual

Jam detection
The top-of-page sensor (PS801) and the paper-delivery sensor (PS803) detect media moving through
the printer. If a jam is detected, the ECU immediately stops the printing process and the jam light on the
control panel illuminates.
Conditions of jam detection
■ Pickup-delay jam—Paper does not reach the top-of-page sensor (PS801) within 1.4 seconds after
the pickup solenoid (SL1) has been turned on, a second pickup operation is attempted, and paper
again does not reach the top-of-page sensor within 1.4 seconds.
■ Pickup stationary jam—The top-of-page sensor (PS801) does not detect the trailing edge of media
within 4.6 seconds of detecting the leading edge.
■ Delivery-delay jam—The paper-delivery sensor (PS803) does not detect the leading edge of media
within 2.1 seconds after the top-of-page sensor (PS801) detects the leading edge.
■ Wrapping jam—The paper-delivery sensor (PS803) does not detect the trailing edge of the media
within 1.5 seconds after the top-of-page sensor (PS801) detects the leading edge and within ten
seconds after the paper-delivery sensor (PS803) detects the leading edge.
■ Delivery-stationary jam—The paper delivery sensor (PS803) does not detect the leading edge of
media within 2.2 seconds after the top-of-page sensor (PS801) detects the trailing edge.
■ Residual media jam—The top-of-page sensor (PS801) or the paper-delivery sensor (PS803)
detects media during the initial rotation period.
■ Door-open jam—The top-of-page sensor (PS801) or the paper-delivery sensor (PS803) detects
media while the print cartridge door is open.
Solenoid, sensors, switches, and motor
The following figure shows the locations of the solenoid, sensors, switches, and motor.
58 Chapter 4 Operational overview ENWW