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4026-0XX
Diagnostic Aids 3-8
Paper Feed Timing
The following describes the timing of paper flow through the printer
to aid in diagnosing paper jam problems. Detection of paper in the
printer paper feed path is accomplished by the low or high status
condition of the paper entry and paper exit sensors. The timing of
the paper as it leaves the input paper tray, passes the input sensor,
exit sensor and into the exit tray, determines normal paper flow or a
paper jam.
Single Sheet Printing: When condition two in the following list is
detected and there is no paper in the paper path the printer powers
down except for the fuser lamp and fan motor.
Multi Sheet Printing: When condition two in the following list is
detected and paper is in the paper path the printer powers down
except for the fan motor.
• Both the paper entry and paper exit sensors are activated
whenever the printer is turned on or the top cover is closed.
• If the paper does not activate the paper entry sensor in the base
printer within two seconds after the D-roll starts rotating or
within four seconds after the D-roll in the optional second paper
tray, if installed, starts rotating, a paper feed error occurs.
• If the paper entry sensor does not deactivate within eleven sec-
onds after the paper leading edge has activated the sensor, a
paper jam error occurs.
• If the paper exit sensor is not activated within 3.5 to 4.5 seconds
after the leading edge of the paper has activated the paper
entry sensor, a paper jam error occurs.
• If the paper exit sensor is not deactivated within 3.4 to 4.7 sec-
onds by the trailing edge of the paper, a paper jam error occurs.