Xerox Phaser 8400 Service Manual page 396

Step Print Service
Test 2: Weak
11
and Missing
Jets.
Are there weak
or missing
jet(s)?
Step Is the customer
experiencing
12
vertical bands
(not light
stripes) in solid
color areas?
Comments:
(Xerox U.S. personnel please add all comments into FIST)
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
A completed checklist and sample prints must be returned with each printhead.
Xerox reserves the right to refuse reimbursement to service personnel who do not enclose a
completed troubleshooting checklist and a sample print with each returned printhead.
Please return the following items with the defective printhead:
Service Print 1 (not necessary for error code-based
failures (not applicable for printheads replace because of
an error code)
This Printhead Troubleshooting Checklist (filled out)
Inventory control "Green Tag" (filled out)
Sample prints that clearly show the observed print quality
defect (not applicable for printheads replace because of an
error code)
Xerox
A-16
If NO go to Step 12.
YES
If YES, do the following:
NO
Check the exit area of the paper path for debris that could be
scraping ink off the drum and may mimic a weak or missing jet.
Circle
Select Eliminate Light Stripes - Basic from the printer front
one
panel up to 3 times as needed to recover a weak or missing jet.
Select Eliminate Light Stripes - Advanced from the printer front
panel up to 2 times as needed to recover a weak or missing jet.
Select Jet Substitution to substitute a working jet for the
missing jet. However, if any of the following criteria is met, you
should replace the printhead instead.
If the customer uses the billing meters features.
If three missing jets of the same color are adjacent (for
example cyan jets 79, 80, and 81).
By the customer runs mainly in Fast Color or Standard mode
(as revealed on the Usage Profile page).
The repair is complete!
If YES, print 10 solid fill pages of cyan. If the bands vary in intensity
YES
and/or location over the 10 prints, the customer is experiencing
NO
stagnant ink discoloration. Continue to print solid fills of the
offending color until the output is uniform. It may take as many as 60
Circle
solid fill pages to refresh all of the ink in the printhead reservoir. The
one
repair is now complete!
If No, the repair is complete!
Phaser 8500/8550 Printhead Checklist 0750984-00
Phaser 8400/8500/8550 Color Printer
Service Print 1
Page 4