Description Of Operations - Toshiba e-STUDIO453 Service Manual

14.2

Description of Operations

The back side printing (recording data of the back side of paper) is performed first by selecting duplex
printing mode and pressing the [START] button. When the trailing edge of the paper passes the exit
gate, the paper is switchbacked by the exit roller and transported into the ADU (the exit gate is closed
with its own weight), and then the switchbacked paper is transported with acceleration. The transporta-
tion decelerates in front of the upper transport roller of the ADU. The front side printing (recording data
of the front side of paper) is performed at the registration section. The paper passes through the exit
gate again and is transported to the receiving tray to complete duplex printing.
There are three methods of judging a paper jam: (1) whether the ADU entrance sensor is turned ON or
not in a specified period of time after the switchback to the ADU started (E510). (2) whether the ADU
exit sensor is turned ON or not in a specified period of time after the ADU entrance sensor is turned
ON (E520). (3) whether the registration switch is turned ON or not in a specified period of time after
the paper feeding from the ADU to the equipment (E110).
If the ADU is opened during duplex printing, the ADU motor and ADU clutch are stopped, namely, ADU
open jam occurs (E430).
The equipment is never to be stopped during printing by interruption in any case except paper jam or
service call.
The operation of the duplex printing differs depending on the size of the paper; single-paper circulation
and alternateness circulation. The figures in the following pages show the circulating operations during
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duplex copying. The numbers in the figures indicate the page numbers.
e-STUDIO350/352/353/450/452/453
AUTOMATIC DUPLEXING UNIT
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