Epson 2070 Service Manual - Page 124

Table 5-2 Sensor Test Points, Test Pin, Number, Test Method, Set Meter to DC Voltage., Troubleshooting

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Troubleshooting LQ-2070 Service Manual 5.2.2 Sensors Table 5-2 Sensor Test Points Sensor Connector Number CN4 (HP Sensor) ^ ^ CN5 (Rear PE Sensor) ^ ^ CN6 (Front PE Sensor) ^ CN13 (PG Sensors ) ^ CN12 (Release Sensor 1) ^ CN16 (Release Snesor 2) ^ CN7 (PW Sensor) ^ ^ ^ Test Pin Number 1: HP 2: GND 3: +5 V 1: +5 V 2: PE 3: GND 1: PE 2: GND 1: PG 1 2: GND 1: Release 1 2: GND 1: Release 2 2: GND 1: E 2: GND 3: +5 V 4: A Test Method (Set Meter to DC Voltage. ) Meter Reading Place one lead on pin 1 and the other lead on pin 2, and check the voltage while blocking the two sensor terminals. Open: +5 V (Home position) Short: 0 V (Not home) ^ ^ Place one lead on pin 2 and the other lead on pin 3, and check the voltage while toggling the sensor lever. Open: +5 V (Paper loaded) Short: 0 V (No paper) ^ ^ Place one lead on pin 1 and the other lead on pin 2, and check the voltage while toggling the sensor lever. Open : +5 V (Paper loaded) Short: 0 V (No paper) Place one lead on pin 1 and the other lead on pin 2 and check the voltage while toggling the sensor lever. ^ Open: +5 V Short: 0 V ^ Place one lead on pin1 and other lead on pin 2 and chaeck the voltage while toggling the sensor lever. Open: +5V Short: 0V ^ Place one lead on pin1 and other lead on pin 2 and chaeck the voltage while toggling the sensor lever. Open: +5V Short: 0V ^ 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. 0 < Open Voltage (No paper) < Short Voltage (Paper loaded) ^ ^ ^ 5-2 Rev. A

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5.2.2 Sensors
Table 5-2 Sensor Test Points
Sensor
Connector
Number
Test Pin
Number
Test Method
(Set Meter to DC Voltage. )
Meter Reading
CN4
(HP Sensor)
1: HP
Place one lead on pin 1 and the other
lead on pin 2, and check the voltage while
blocking the two sensor terminals.
Open:
+5 V
(Home position)
Short: 0 V
(Not home)
^
2: GND
^
^
3: +5 V
^
CN5
(Rear PE
Sensor)
1: +5 V
Place one lead on pin 2 and the other
lead on pin 3, and check the voltage while
toggling the sensor lever.
Open: +5 V
(Paper loaded)
Short: 0 V
(No paper)
^
2: PE
^
^
3: GND
^
CN6
(Front PE
Sensor)
1: PE
Place one lead on pin 1 and the other
lead on pin 2, and check the voltage while
toggling the sensor lever.
Open : +5 V
(Paper loaded)
Short: 0 V
(No paper)
^
2: GND
^
CN13
(PG Sensors )
1: PG 1
Place one lead on pin 1 and the other
lead on pin 2 and check the voltage while
toggling the sensor lever.
Open: +5 V
Short: 0 V
^
2: GND
^
CN12
(Release
Sensor 1)
1: Release 1
Place one lead on pin1 and other lead on
pin 2 and chaeck the voltage while
toggling the sensor lever.
Open: +5V
Short: 0V
^
2: GND
^
CN16
(Release
Snesor 2)
1: Release 2
Place one lead on pin1 and other lead on
pin 2 and chaeck the voltage while
toggling the sensor lever.
Open: +5V
Short: 0V
^
2: GND
^
CN7
(PW Sensor)
1: E
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.
0 < Open Voltage
(No paper)
< Short Voltage
(Paper loaded)
^
2: GND
^
^
3: +5 V
^
^
4: A
^
Troubleshooting
LQ-2070 Service Manual
5-2
Rev. A