a. Cassette detection/cassette paper size detection/cassette paper level detection
The upper and lower cassettes detection is executed by the upper cassette sensor (PS1202) and
the lower cassette sensor (PS1201). The paper detection in the upper and lower cassettes is exe-
cuted by the upper cassette paper out sensor (PS1208) and the lower cassette paper out sensor
(PS1207). The paper size detection is executed by the upper and lower cassette paper size detec-
tion switches (SW1601 to SW1604) installed to each cassette. Each cassette has the four
switches. The combinations of the cassette paper size detection switches are shown in Table 2-
5-1.
Table 2-5-1
The remaining paper level in the cassette is detected according to the lifter position. The lifter
contains a light blocking plate which blocks two sensors on the pick-up PCB. The lifter position
is detected by these sensors. And, as a result, the remaining paper level in the cassette is detect-
ed.
The remaining paper level in the upper cassette is detected by the combination of outputs
from the upper cassette paper level sensor 1 (PS1205) and the upper cassette paper level sen-
sor 2 (PS1206). The paper level in the lower cassette is detected by the combination of outputs
from the lower cassette paper level sensor 1 (1203) and the lower cassette paper level sensor 2
(PS1204). Figure 2-5-6 shows the combinations of PS1205/PS1203 and PS1206/PS1204.
2 - 47
CHAPTER 2
SW1601
OFF
OFF
ON
ON
OFF
OFF
SW1602
OFF
ON
OFF
ON
OFF
OFF
SW1603
OFF
OFF
OFF
OFF
OFF
ON
SW1604
OFF
OFF
OFF
OFF
ON
OFF
Cassette paper-size sensing switch
Paper size
Ledger
A3
B4
Legal
Letter
A4