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Service Guide OJ2010
Chapter 4 Failure and Repair Analysis
4.8.04 Encoder Sensor Test
This test disables the printer motors to allow you to manually move the carrier to verify that the encoder is
working correctly.
To run the test, follow this procedure.
1. Power
OFF
the unit.
2. Move the two pin jumper on connector J13 of the system board to the position shown below.
3. Power
ON
the printer.
4. The test will start.
5. Manually move the carrier.
6. The Power
ON
light should flash.
If the Power
ON
light does not flash, power
OFF
the printer.
Remove the carrier assembly without unplugging the printhead cable.
Power
ON
the printer.
Check for + 5 vdc at pins 1, 2, and 3 of the encoder card connector.
If the voltage is not present, check the printhead cable for opens to the encoder card.
If the printhead cable is good, replace the system board.
If voltage is present, check the sensor on the encoder card by monitoring pin 3 of the encoder card
connector as you pass a piece of paper through the sensor.
The voltage should go from + 5 vdc to 0 vdc.
Power
OFF
the printer.
Power
ON
the printer.
Check the voltage again.