Sensors - Epson LQ-2170 Service Manual

Troubleshooting

5.2.2 Sensors

Sensor
Test Pin
Connector
Number
Number
CN4
1: HP
(HP Sensor)
^
2: GND
^
3: +5 V
CN5
(Rear PE
1: +5 V
Sensor)
^
2: PE
^
3: GND
CN6
(Front PE
1: PE
Sensor)
^
2: GND
CN13
1: PG 1
(PG Sensors )
^
2: GND
CN12
(Release
1: Release 1
Sensors 1 and
2)
^
2: GND
^
3: Release 2
^
4: GND
CN7
1: E
(PW Sensor)
^
2: GND
^
3: +5 V
^
4: A
CN2
(Case Open
1: COPEN
Sensor)
^
2: GND
5-2
Table 5-2 Sensor Test Points
Test Method
(Set Meter to DC Voltage. )
Place one lead on pin 1 and the other
lead on pin 2, and check the voltage while
blocking the two sensor terminals.
Place one lead on pin 2 and the other
lead on pin 3, and check the voltage while
toggling the sensor lever.
Place one lead on pin 1 and the other
lead on pin 2, and check the voltage while
toggling the sensor lever.
Place one lead on pin 1 and the other
lead on pin 2 and check the voltage while
toggling the sensor lever.
Place one lead on pin 1 and the other
lead on pin 2, and check the voltage while
toggling the sensor lever.
Place one lead on pin 3 and the other
lead on pin 4, and check the voltage while
toggling the sensor lever.
Place one lead on pin 1 and the other
lead on pin 2, and check the voltage while
inserting and removing paper between
the platen and sensor.
Place one lead on pin 1 and the other
lead on pin 2, and check the voltage while
toggling the sensor lever.
LQ-2170 Service Manual
Meter Reading
Open: +5 V
(Home position)
Short: 0 V
(Not home)
^
^
Open: +5 V
(Paper loaded)
Short: 0 V
(No paper)
^
^
Open : +5 V
(Paper loaded)
Short: 0 V
(No paper)
^
Open: +5 V
Short: 0 V
^
Open: +5 V
Short: 0 V
^
^
^
0 < Open Voltage
(No paper)
< Short Voltage
(Paper loaded)
^
^
^
Open: +5 V
(Case open)
Short: 0 V
(Case closed)
^
Rev. A