Section 7: Replacement Procedures
Page 7-12
CG4 Series Service Manual
7.9 I-MARK/GAP SENSOR REPLACEMENT
The Gap sensor is of a transmit/ receive variety. The transmit and receive sensors are mounted separately on
the left media guide.
The I-Mark/Gap sensor may need replacement if cleaning or adjustment of sensor sensitivity does not
improve their functionality.
1. Remove the Bottom Housing Cover as explained in the
earlier
Section 7.3 Removal of the Bottom Housing cover.
2. Lift the Top Cover.
3. Press the Media guide slide lever to adjust the Media
guides
to the maximum width.
4. Remove the washer faced screw and then the Media guide
gear
that are holding the Media guides in placed.
5. Push the hook on the bottom right of the frame slightly in
the direction of the arrow to remove the shaft. Push in the
shaft of the Media guide from the right side of the printer
and pull out from the left.
6. Lift up the left Media guide by tilting it as shown. Please be
careful with the attached
Sensor cable when removing the
Media guide.
7. With the Sensor cable attaching to the left Media guide,
remove the
screw (circled) securing the cover of the left
Media guide
.
Notes:
• Avoid exert pulling force to the sensor cable while
replacing the sensor boards.
• Insert the
tab of the cover first when assemble the
cover back to the left media guide.
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