6-12 Phaser 84000/8500/8550/8560 Color Printer Service Manual
Adjustments and Calibrations
Jet Substitution Mode
On 8400 models, the Jet Substitution Mode provides a temporary solution for
print-quality problems when weak or missing jets cannot be recovered. When
Jet Substitution Mode is active, adjacent jets are used to print over the area
covered by the problem jet to restore the print-quality. Jet Substitution Mode
reduces the maximum imaging speed by 50% or more and has other
limitations that affect printer performance.
Jet Substitution Mode on 8500/8550/8560 models is in the Eliminate Light
Stripes menu. Although it does not slow down the imaging speed as it does on
8400
models, it still provides an end solution to eliminating light stripes.
Phaser 8500/8550/8560 printers feature a Jet Substitution mode that is
similar to Phaser 8400 printers, but with two important differences:
■ Jet Substitution mode on 8500/8550/8560 models can provide an end
solution instead of serving as a temporary fix (as for Phaser 8400
printers). Because Jet Substitution mode can provide an end solution, it is
located in the “Eliminate Light Stripes” menu instead of requiring a hidden
push button sequence, as is the case with Phaser 8400 printers.
■ Most 8500/8550/8560 users will not notice changes to print-quality or
speed when using the Jet Substitution mode. It typically increases the
imaging time by no more than one or two seconds per page compared to
a 50% increase on 8400 modles.
The knowledge base provides new procedures for determining when to use
Jet Substitution mode. Factors such as the use of the Billing Meters feature
and multiple, adjacent problem jets can affect the recommended solution.
Enabling Jet Substitution Mode (8400)
To add Jet Substitution Mode to the Control Panel menu:
1. Scroll to Troubleshooting, and then press the OK button.
2. Scroll to Print Quality Problems, and then press the OK button.
3. Press and hold the Up Arrow button, then press the Back button.
The Jet Substitution Mode is now displayed on the Control Panel.
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