Lexmark 7000 Color Jetprinter, Service Manual

Page: 31 / 85

3-2
4092
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.