Lexmark OptraImage 443, Service Manual

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2. The turn-on method for each LED are listed below:
The Yellow LED:
Turn on the scanner.
The Green LED: Turn on the scanner and wait for the scanner to get ready.
The Red LED: Turn on the scanner and wait for the scanner to get ready. Then push the paper-in
sensor on the ADF. Three seconds later the paper-in scanner will turn the ADF motor. Keep holding
this sensor. A few minutes later the scanner will stop turning the ADF motor, and then the Jam LED
will be on. Remember to keep holding the sensor.
3. As described above, if the corresponding LED remains off, follow the procedures below to locate the
error.
i. Check the LED cable connection.
ii. Check the LED cable for any broken wires.
iii. Check the voltage level at the connector. The correct voltage levels for LED’s ON/OFF are listed
below:
LED ON 2.4V
LED OFF 5.0V
iv. If voltage levels are correct, replace the LED board.