C7085-90921 Chapter 5 Theory of operation 127
Paper size detection
The paper size and the presence of the cassette are detected by the paper-size detection switches
(SW801, SW802, and SW803). The combinations of paper-size detection switches are listed in
Table 5- 5.
Fusing and delivery unit
The fusing motor (M1) drives the fusing assembly, and the paper delivery rollers. Paper separated
from the ITB is fed into the fusing unit, and output from the fusing unit by the upper and lower fusing
rollers and fusing delivery roller. The paper output from the fusing unit is then detected by the
delivery unit paper sensor (PS7).
The pressure release sensor (PS6) detects when the fusing roller pressure is off.
The printer uses a deflector to switch between the face-up bin and face-down bin. When the face-up
bin is open, the paper is delivered to the face-up bin. When the face-up bin is closed, paper will be
delivered to the face-down bin (see Figure 5-31).
If the face-down bin becomes full, it is detected by the face-down bin paper full-sensor (PS9).
Figure 5-31 Fusing and delivery unit
Table 5-5 Paper size detection switches
Paper size Cassette paper-size detection switch
SW801 SW802 SW803
Legal OFF OFF ON
A4 ON ON ON
Letter OFF ON ON
Executive OFF ON OFF
B5 ON ON OFF
B5-ISO ON OFF OFF
A5 ON OFF ON
No cassette OFF OFF OFF
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