Lexmark 7000 Color Jetprinter Service Manual - Page 30
Encoder Sensor Test, If voltage is not present, check the printhead cable for opens
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4092-001 Encoder Sensor Test This test disables the printer motors to let you manually move the carrier to verify the encoder is working correctly. To run the test: 1. Turn the printer off and place a two pin jumper on connector J6 as shown below. (Pins 1 & 2). 2. Ensure the manual paper slot is empty. 3. Press and hold the Paper Feed button while turning the printer on and continue to hold until the Busy Light begins to flash. • Manually moving the carrier to the left causes the Power Light to flash. • Manually moving the carrier to the right, causes the Busy Light to remain on. If the test fails power off the printer and remove the carrier assembly without unplugging the printhead cable. Power on the printer and check for +5 V dc at pins 1, 2 and 3 of the encoder card connector. See "Connector Locations on page 5-1." 1. If voltage is not present, check the printhead cable for opens to the encoder card. If the printhead cable is good, replace the system board. 2. 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 V dc to 0 V dc. Turn the power off and back on to make this check again. If the voltage at pin 3 does not change, replace the encoder card. If the symptom remains, replace the printhead cable. 3-2