Service manual

EPSON EPL-5800 Revision B
Operating Principles Operating Principles of Mechanism 48
PAPER EMPTY SENSOR
Paper empty sensor (PI21) is mounted on the relay board (PWB-A) of the second paper
feed unit
and it detects paper empty in the second paper feed cassette.
When there is paper on the tray, the actuator stands up and the sensor becomes OFF.
When paper on the tray went out, the actuator falls into the hole of the tray lifting board and
the sensor becomes ON.
CASSETTE TYPE SENSOR
Cassette type sensor switch (SW21) with sector-shaped lever is mounted on the second
paper feed unit.
When the cassette for each paper size is inserted, the switch presser on the right side of each
cassette pushes the lever according to the paper size and it turns the cassette type sensor
ON.
This switch is the three-consecutive switch, and the printer distinguishes the cassette type
(paper size) by ON/OFF combination of three switches.
Figure 2-4. Cassette Type Sensor Mechanism
OFF
ON
Paper Feed
Cassette
Cassette Type Sensor Switch (SW21)
Switch Presser
SW21-3
SW21-2
SW21-1
4121s025
4121s026
Lever
Table 2-1. ON/OFF of SW21 on each cassette type
Cassette Type SW21-1 SW21-2 SW21-3
A4 OFF OFF ON
B5 ON ON OFF
Letter OFF ON OFF
Executive OFF ON ON
No cassette or
cassette is not specified
OFF OFF OFF
ON ON ON
ON OFF ON