Switches And Sensors - Epson EPL-N2700 Service Manual

EPSON EPL-N2700 / N2750

2.1.3.1 Switches and Sensors

Table 2-1. Switches and Sensors
Location Name
Printer main body
S1 Main Switch
Right Door Interlock
S2
Switch
Timing Roller Front
PC2
Sensor
PC3 Paper Eject Sensor
MP Cassette Paper
PC4
Empty Sensor
MP Cassette Paper Near
PC5
Empty Sensor
PC6 MP Cassette Set Sensor
PWB-1 MP Cassette Size Sensor
MP Cassette Paper Size
S3
Sensor
PWB-G Toner Empty Sensor
TH1 Fuser Thermistor
Operating Principles
Function
Turns on/off power.
Detects open-close condition of the right
door. (The right door is opened when the
imaging cartridge is replaced.)
Detects the paper has been fed.
Signal is LOW when paper is detected.
Detects the paper has been output.
Signal is Low when paper is detected.
Detects the paper empty condition for the
MP Cassette.
Signal is HIGH when no paper is in the
cassette.
Detects the paper near empty condition for
the MP Cassette.
Signal is LOW when no paper is in the
cassette.
Detects the MP Cassette is installed.
Signal is HIGH with the cassette installed.
Detects the size of the paper set in the MP
Cassette.
Detects the size of the paper set in the MP
Cassette is whether A4 or LETTER.
Detects the toner empty condition for the
imaging cartridge.
Signal is LOW when the toner has run out.
Cuts off the voltage for the heater lamp
when the upper fusing roller heats up
abnormally.
Printer Mechanism Operating Principles
Location Name
TS1 Fuser Thermostat
TF1 Fuser Temperature Fuse
Cassette 1
Cassette 1 Paper Empty
PC22
Sensor
Cassette 1 Paper Near
PC25
Empty Sensor
Cassette 1 Right Door Set
PC23
Sensor
Revision B
Function
Cuts off the voltage for the heater lamp
when the upper fusing roller heats up
abnormally.
The fuse is blown when the temperature of
the upper fusing roller has risen
abnormally.
Detects the paper empty condition for the
Cassette 1.
Signal is LOW when no paper is in the
cassette.
Detects the paper near empty condition for
the Cassette 1.
Signal is LOW when no paper is in the
cassette.
Detects open-close condition of the
Cassette 1 right door.
The signal is HIGH when the door is
closed.
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