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5.5.6 Carriage Home Sensor
1. Remove the cabinet (see 5.5.1).
2. Remove the 2 screws in the PCB upper corners or, if the PCB has button fasteners, pry each upper corner
free and fold the PCB down.
3. Disconnect the Carriage Home Sensor cable from J5 of the Main PCB.
4. Remove the 2 screws fastening the sensor to the left pivot arm and remove the cable tie fastening the
sensor cable to the pivot arm.
5. To install the new sensor reverse the procedure in steps 1 to 4.
5.5.7 Document Sensor
This does not apply to document sensors in printers with the automatic alignment feature. See 5.5.14 and
5.5.15 for replacement of those sensors.
1. Remove the cabinet (see 5.5.1).
2. Remove the 4 screws mounting the mechanism to the baseplate.
3. Remove the 2 screws in the PCB upper corners or, if the PCB has button fasteners, pry each upper corner
free and fold the PCB down.
4. Disconnect the Document Sensor cable from J5 of the Main PCB.
5. Slide the left roller spring off the roller spring cam and lift the spring off the front roller.
6. Remove the screws fastening the input guide and the document sensor to the left side plate. Keep the
sensor mounting spacer that is freed when the sensor mounting screw is removed.
7. Raise the input tray and slide the sensor to the left to free it from the input guide. Lift the left ends of the
front roller and the input guide just enough to remove the sensor.
8. Mount the new sensor and route its cable back under the document drive to the Main PCB.
9. Push the mechanism toward the front right corner of the baseplate before fastening them.
10. Insure that the sensor PCB sits flush against the baseplate and left edge of the input guide and that the
sensor cable passes under the sensor mounting spacer.
11. Reverse the procedure in steps 1 to 6. Insure that the left roller spring is inside the roller bushing flanges
and that the spring ends hook inside the side plate slots.
12. Adjust the input guide so there is no more than .020” clearance between it and the carriage.
13. Adjust the TOP, INDEX and EJECT HOLD offsets under so that inserted documents are correctly
positioned (See 5.2). Record any new values on the parameter label.