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Diagnostic Information 2-65
4085-001
Print Quality Service Check
Note: Before troubleshooting any print quality problem, be sure the
cartridge is in good condition. Set print quality to normal and be sure the
correct paper type is selected in the Paper Menu.
FRU Action
The machine print quality can look poor as a result
of either faulty printheads or poor carrier to
printhead electrical contact. Generally random
missing nozzles indicate a printhead failure.
However, more patterned print quality defects may
be caused by poor carrier to printhead electrical
contact or electrical interface problems with the
carrier cable, carrier card, or engine card. Print the
‘Contacts Page’ in diagnostics to evaluate for
electrical interface errors.
1 Printhead Carrier
Assembly
Print the 'Contacts Page' in diagnostics. Look for
breaks in the diagonal lines that are printed on the
page. If the missing nozzles are patterned, the
problem could be pogo pin to printhead tab circuit
contact. Remove the printhead and clean the tab
circuit with a clean, lint-free, damp cloth. Inspect
the carrier for bent pogo pins, or for contamination
on the pogo pins. Clean the pogo pins only with a
clean, lint-free cloth. (care should be taken to
avoid contact with the pogo pins that contact the
ink tank memory chips. These pins are lubricated
with a grease to minimize wear and prevent pogo
pin damage. This grease should not be smeared
on the surrounding pogo pins as it may trap
contamination and cause contact failures).
Note: Unplug the printer before cleaning
contacts.
2 Printheads If the error is random missing nozzles, conduct a
clean as described on page 3-8. Try cleaning the
printhead nozzle plate by holding a damp cloth
against the nozzle plate for about three seconds.
Gently blot and wipe dry. Replace if necessary.
3 Carrier Cable If the missing nozzles are patterned, the problem
could be the carrier cable. Inspect for damage
and replace if necessary. Check that the carrier
cable connections are clean and secure.