B245/B276/B277/B268/B269 Service Manual 18-Jan-06
243
Paper Size Detection
Paper Tray
SW
Size
1 2 3
A3, 11" x 17" Off Off Off
A4 LEF On On Off
A4 SEF, 8
1
/
2
" x 11" On Off Off
A5 LEF, 8
1
/
2
" x 14" Off On On
8
1
/
2
" x 13" On Off On
11" x 8
1
/
2
" Off On Off
* (Asterisk) Off Off On
ON=Not pushed, OFF=Pushed
There are three paper size micro-switches [A] on the front right plate of the paper tray unit.
The switches are actuated by a paper size actuator [B] behind the paper size indicator plate,
which is on the front right of the tray.
Each paper size has its own actuator, with a unique combination of notches. To determine
which size has been installed, the CPU reads which micro-switches the actuator has
switched off.
The CPU disables paper feed from a tray if the paper size cannot be detected. If the paper
size actuator is broken, or if there is no tray installed, the Add Paper indicator will light.
When the paper size actuator is at the ā*ā mark, the paper tray can be set up to accommodate
one of a wider range of paper sizes by using User Tools. If the paper size for this position is
changed without changing the User Tool setting, a paper jam will result.
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