Encoder Sensor Test - Lexmark WinWriter 150c Service Manual

4077-001

Encoder Sensor Test

This test disables the printer motors to allow you to manually move
the carrier to verify the encoder is working correctly.
To run the test:
1. Turn the machine off and move the two pin jumper on connector
J13 to the pin position shown below.
2. Turn the machine on to start the test. Turn power off or unplug
the printer to stop the test.
3. Return the jumper to its original pin position after completing the
test.
The power on light flashes as the carrier is moved. If the power on
light does not flash, 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.
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.
21
J13