Toshiba e-STUDIO2008A Service Manual page 113

3.16.3 Functions
1. ADU motor (M5)
Drives the ADU upper transport roller and the ADU lower transport roller. The ADU motor is installed
to the rear frame of the equipment.
2. ADU entrance sensor (S7)
Detects the paper transported in the ADU.
3. ADU exit sensor (S6)
Detects the paper transported in the ADU.
4. ADU opening/closing switch (SW5)
Detects opening/closing of the ADU.
5. Transport roller (Upper/Lower)
Transports the paper inside the ADU.
3.16.4 Description of Operations
For the 20/25/30 ppm models, when the trailing edge of the paper passes through the exit gate, the exit
roller switchbacks to transport it into the ADU (the exit gate is switched on its own weight). The
switchbacked paper is transported as the transport speed increases. When the ADU exit sensor
detects the paper, the speed starts to decrease.
After the paper is transported to the registration section, the printing of the front side (recording data on
the front side of paper) is performed.
The paper passes through the exit gate again and exits to the exit tray to complete duplex printing.
For the 35/45/50 ppm models, when the paper passes through the reserve sensor, the reverse gate
solenoid switches the reverse gate, and the reverse roller switchbacks to transport the paper into the
ADU. The switchbacked paper is transported as its transport speed increases. When it is transported to
the ADU exit sensor, the speed decreases.
After the paper is transported to the registration section, the printing of the front side (recording data on
the front side of paper) is performed.
The paper passes through the lower exit roller and exits to the exit 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 sensor 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 is 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.
For the 20/25/30 ppm models, the duplex printing operation varies depending on the size of the paper,
single-paper circulation and alternateness circulation.
© 2015 TOSHIBA TEC CORPORATION All rights reserved e-STUDIO2008A/2508A/3008A/3508A/4508A/5008A
3 - 67
OUTLINE OF THE MACHINE
3