Table of Contents
Advertisement
GP 11 How to Check a Sensor
Description
Use this procedure to check the operation of all types of sensor.
NOTE: The upper circuit diagram, in
Figure 1
tor within the sensor, other sensors require a resistor on the PWB, such as R1 in
resistor limits the current through the LED. This decreases the voltage on the sensor LED to
1.2V, typically.
NOTE: The voltages, PJ numbers, pin numbers and PWB names shown are an example only.
Go to the circuit diagram in the RAP for the correct information.
Initial Actions
Ensure that the electricity to the machine is switched off while performing tasks that do
not need electricity. Refer to
GP
14. Disconnect the power cord. Electricity can cause
death or injury. Moving parts can cause injury.
Perform the steps that follow:
1.
Make sure that the sensor is installed correctly.
2.
Clean the sensor and the area around the sensor.
3.
If a flag actuator is installed, check that it has free movement.
4.
Check that the paper path is clear.
5.
If the sensor activates by a surface that reflects, check that the surface is clean. Also
make sure that there is not an obstruction between the sensor and the surface.
6.
If the sensor actuates by an encoder disc, ensure the holes or gaps in the disc are aligned
correctly with the sensor.
Sensor Action
In the upper sensor, in
Figure
1, when light from the LED is allowed to fall on the photo-sensi-
tive transistor, the sensing line, PJA, pin2, is low. When light from the LED is blocked by the
flag, the sensing line is high.
In the lower sensor in
Figure
1, when light from the LED is reflected by the paper onto the
photo-sensitive transistor, the sensing line, PJE, pin 2 is low. When no paper is present, no
light falls on the transistor and the sensing line is high.
Quick Sensor Check
Enter the component control code for the sensor, refer to dC330. Activate the sensor. If the dis-
play changes, the sensor operates correctly. If the display does not change, perform the proce-
dure.
Procedure
For the upper sensor in
Figure
1:
•
Go to
Flag
1. Disconnect PJA. Check for +3.3V and 0V at PJA on the harness.
•
Go to
Flag
2. Disconnect PJC. Check the wiring and the connectors for the sensor circuit.
•
Go to
Flag
2. Check for +3.3V and 0V at PJC on the IOT PWB.
•
If necessary, install new components or repair the wiring.
Xerox® WorkCentre® 5790 Family
shows a flag sensor. Some sensors have a resis-
WARNING
References:
•
01B
0V Distribution RAP.
•
01D
+3.3V Distribution RAP.
•
REP 1.2
Wiring Harness Repairs.
Figure
1. The
May 2013
6-27
Figure 1 Circuit diagram
General Procedures/Information
GP 11
Advertisement
Chapters
Table of Contents
