Ricoh A230, Service Manual, Page: 549 / 1134

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SHIFT TRAY UP/DOWN MECHANISM
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SM A230/A231/A232
2.6 SHIFT TRAY UP/DOWN MECHANISM
The shift tray lift motor [A] controls the vertical position of the shift tray [B] through
gears and timing belts [C]. When the main switch is turned on, the tray is initialized
at the upper position. The tray is moved up until stack height sensor 1 [D] is de-
actuated.
During copying, the actuator feeler [E] gradually rises as the copy stack grows, and
the actuator gradually moves towards stack height sensor 2 [F].
In sort/stack mode, if stack height sensor 2 is actuated for 3 seconds, the shift tray
lift motor lowers the shift tray for 15 ms.
In staple mode, when the stack feed-out motor starts, the tray is moved down until
stack height sensor 1 is actuated and then moved up until stack height sensor 1 is
de-actuated. This corrects the current tray position. Then, the tray is moved down
again until stack height sensor 1 is actuated to make space for the coming set of
copies and then moved up until stack height sensor 1 is de-actuated. This means
the tray lowers earlier in staple mode, to prevent the next copy suddenly exceeding
the space currently available on the tray.
For both modes, the shift tray will rise until stack height sensor 1 is de-actuated
when the user takes the stack of paper from the shift tray.
This machine has two shift tray lower limit sensors 1 [G], 2 [H]. Shift tray lower limit
sensor 1 detects the near lower limit and sensor 2 detects the lower limit. When the
actuator [I] enters sensor 1, a message will be displayed and copying will continue.
When the actuator enters sensor 2, a message will be displayed and copying will
stop.
The shift tray upper limit switch [J] prevents the drive gear from being damaged if
stack height sensor 1 fails. When the shift tray pushes up the shift tray positioning
roller [K], the switch will cut the power to the shift tray lift motor.
[C]
[A]
[K]
[F]
[D]
[E]
[B]
[H]
[G]
[J]
[I]