To diagnose the faulty printhead:
1.Open the Printhead Access Cover and unlock the printhead latch.
2.Remove the cyan, magenta and yellow printheads and close the Printhead Access Cover.
3.The LCD Panel will display the message "DETECTING..." as it checks the printhead.
4.If the message "B 
" appears, it means that the black printhead is faulty. If this happens, press the 
button. Remove the Printhead Access Cover and replace with a new black printhead. Fasten the printhead latch and close the Printhead Access Cover to verify that the new printhead is working.
If the message "B 
" appears, it means that the black printhead is working.
5.Follow the sequence found in step 4 with each of the remaining printheads to verify functionality.
6.Isolate the faulty printhead by this method, and replace it with a new one.
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