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3.9 Replacing the Gap and Black-mark Sensor Module 
 
1. Open the printer right side cover. 
2. Disengage printhead release lever. 
3. Refer to section 3.1 and 3.4 to remove electronics cover and multi-interface  board. 
4. Disconnect the gap and black-mark sensor connectors from the main board. 
 
5. Remove 5 screws to take off the lower printhead  mechanism. 
 
 
6. Replace the sensor module. 
7. Reassemble the parts in the reverse procedures. 
Black-mark sensor 
module connector 
Gap sensor module 
connector 
Lower printhead 
mechanism