Lexmark 5028-135 CS720

Sensor tests

1. Enter the Diagnostics menu, and then touch Printer diagnostics & adjustments.
2. From the Sensor tests section, touch Start. A dialog listing the sensor tests appears.
3. Find, and then manually toggle the sensor.

Notes:

• The sensor status on the screen toggles between 1 and 0 when the sensor is properly working.
• If a sensor test fails, the test failure may not indicate a failed sensor. Further troubleshooting may be required. Check the boards and cables for possible issues.

Motor tests

1. Enter the Diagnostics menu, and then navigate to:
   Printer diagnostics & adjustments > Motor tests
2. Select a motor, and then touch Start.

Notes:

• If the motor is activated, then it is properly working.
• Some motors require automatic deactivation in order to avoid secondary issues such as possible damage and contamination.
• Some tests require a special action to activate a motor such as removing a major component.
• If the motor fails, the test failure may not indicate a failed motor. Further troubleshooting may be required. Check the boards and cables for possible issues.

Entering invalid engine mode

This mode is used if the machine has invalid code and needs the correct code loaded. After entering this mode, the firmware code can be updated.

1. Turn off the printer.
2. Press and hold the 3, 4, and 6 buttons simultaneously.
3. Turn on the printer.
4. Release the buttons after 10 seconds.