1. Check that the cable for the faulty sensor is not damaged and is connected correctly.
2. Replace the faulty sensor.
NOTE: Covers sensors are disabled in sleep mode, don't expect them to work in this situation.
The Line Sensor has problems detecting paper
To resolve Line Sensor paper detection problems, do the following.
1. Check the type of paper that is being used: the Line sensor may have problems detecting transparent
paper or some types of Non-HP paper. Try loading white HP paper into the printer and check whether
the Line Sensor detects it.
2. Excessive ink deposits on the Platen surface can fool the sensor by reflecting the light. Clean the Center
Platen.
3. Clean the Encoder Strip
See Clean the Encoder Strip on page 452.
4. The Line Sensor is not calibrated correctly. Perform the Line Sensor Calibration
See Line Sensor
calibration on page 120.
5. The Line Sensor is damaged or faulty. Replace the Line Sensor
See Line Sensor Assembly
on page 285.
How to remove the Left Hub when the actuator is broken
You need a standard 90º Torx/Allen key(Torx T10 or Allen 2.5).
1. Insert the key about 20 mm between the sheet-metal and plastic parts.
2. Pull the key to the left to release the brake.
10 Chapter 2 Troubleshooting ENWW
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