Pro 7900 and 9900 Field Repair Guide 10/6/10
Missing Nozzle Diagnosis Printer Component, Software Item, LCD Display, Printer Button Page 233.
2. Perform a Cleaning Cycle on the missing nozzles (Color Pair cleaning is the most efficient use of
Ink).
3. Perform a Nozzle Check and mark it as #2.
3.1 Compare Nozzle Check 1 to 2.
3.1.1 If the missing nozzles on nozzle check 1 have cleared up, and new ones have appeared:
3.1.1.1 Stop Cleaning, this is reverse flow.
3.1.1.1.1 Print a sample print (Stress Test is recommended) that uses all colors to “print
out” the air that is in the Nozzle Plate.
3.1.2 If one or more nozzles have not cleared up:
3.1.2.1 Repeat steps 1 - 3.
3.1.2.1.1 If 3 cleaning cycles does not clear up 1 or more of the same nozzles, replace
the Print Head.
Note: If the same nozzle or nozzles are always missing, this indicates that the Print Head has a problem
mechanically or electrically.
Some Nozzles Drop Out While Printing (1 or more channels)
Nozzle drop out while printing indicates a ink supply issue. The Print Head demands ink during the
printing process, and the Ink System does not deliver it properly. The Print Head slowly “starves” for
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