Paper Sensor; Tray Exit Sensor - Gestetner B003 Service Manual

TRAY SENSORS
2.3 TRAY SENSORS
[A]
[C]
[A]

2.3.1 PAPER SENSOR

There is a paper sensor [A] for each tray (total 10 pcs). The paper sensors in
tray 1 to tray 8 contain an LED and a phototransistor. The paper sensor in the
tray 0 contains only an LED. The paper sensor in tray 9 contains only a
phototransistor. The paper detection mechanism and their function are the
same as for the proof tray.
2.3.2 PAPER OVERFLOW SENSOR
There is a paper overflow sensor [B] above each tray. The machine detects
paper overflow in a tray when the top of the paper stack pushes up the sensor
feeler [C]. When this condition occurs, the printing job is stopped until the
paper stack is removed.

2.3.3 TRAY EXIT SENSOR

There is a tray exit sensor board [D] above the 1st tray (the mounting above
tray 1 is called 'tray 0') and on trays 3, 6, and 9. The tray exit sensor board on
trays 3 and 6 contains an LED and a phototransistor.
The tray exit sensor board above the 1st tray contains only an LED. The tray
sensor board on the 9th tray contains only a phototransistor.
The machine detects paper leaving trays 1 to 3 using the sensor above tray 1
and the one on tray 3. When paper passes between those sensors, the light
from the LED above tray 1 is interrupted.
B003/B004/B006/B007
[D]
[B]
[D]
G909D506.WMF
15-8
[B]
[A]
G909D507.WMF
[D]
Tray 0
Tray 1
Tray 2
Tray 3
Tray 4
Tray 5
Tray 6
Tray 7
Tray 8
Tray 9
SM