Toshiba e-STUDIO2500c, Service Manual, Page: 369 / 402

16
May 2006 © TOSHIBA TEC e-STUDIO2500c/3500c/3510c AUTOMATIC DUPLEXING UNIT (ADU)
16 - 5
16.5 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 when the ADU exit sensor (S39) detects the paper. 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 inner tray to complete duplex printing.
There are three methods of judging a paper jam: (1) whether the ADU entrance sensor (S38) 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 (S39) is turned ON or not in a specified period of time after the ADU entrance sensor
(S38) is turned ON (E520). (3) whether the registration sensor (S28) 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 (M22) and ADU clutch (CLT7) 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, if paper remains in the ADU.
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
duplex copying. The numbers in the figures indicate the page numbers.