Tray Lift And Paper Height Detection Mechanism - Ricoh A230 Service Manual

2.2 TRAY LIFT AND PAPER HEIGHT DETECTION
MECHANISM
[B]
[A]
The lift motor [A] controls the vertical position of the tray bottom plate [B] through
gears and timing belts [C].
Tray lifting conditions
When the tray lift sensor [D] turns off in the following conditions, the tray lift motor
raises the tray bottom plate until the tray lift sensor [D] turns on again.
• Just after the main switch is turned on
• During copying
• Just after the tray cover is closed
• Just after leaving the energy saving mode
Tray lowering conditions
In the following conditions, the lift motor lowers the tray bottom plate until the lower
limit [E] sensor turns on.
• Just after the paper end sensor turns on
• Just after the down switch is pressed by the user
The amount of the paper in the tray is detected by combination of high/low outputs
from three sensors (paper height sensor 1 [F], 2 [G], and 3 [H].)
Amount of paper
Near end
25%
50%
75%
100%
SM

TRAY LIFT AND PAPER HEIGHT DETECTION MECHANISM

[C]
Paper Height Paper Height
Sensor 1 Sensor 2
On (High) Off (Low)
Off (Low) On (High)
Off (Low) On (High)
Off (Low) Off (Low)
Off (Low) Off (Low)
9-7
[D]
[F]
[G]
[H]
[E]
A683D501.WMF
Paper Height
Sensor 3
Off (Low)
Off (Low)
On (High)
On (High)
Off (Low)
A230/A231/A232