Tektronix Phaser 380 Service Manual page 330

B
Test Patterns
Service Test Print 2 - Weak jet. This print shows
which jets are not outputting enough, if any, ink
compared to its neighboring jets. Note that the
yellow jets bands have a small amount of cyan ink
added to them, which tints them green, to make
them more visible.
Look for: No interlacing is used in this print; expect
light/dark variation between jets. Look for much
lighter colored vertical bands in the horizontal bars.
Weak jets in the yellow band are distinguished by a
cyan tint.
Causes : A jet may be partially clogged; perform
printhead clean/purge cycles on the printhead to
remove contaminants from the poor performing jet.
Perform the Deep Clean cycle selected from the
Extended Service Support menu. It will take about
30 minutes to run. If the jet still will not recover, turn
the printer off for 2 to 3 hours (or overnight, if
practical). Then perform clean/purge cycle again.
As a last resort, replace the printhead.
Service Test Print 3 - Secondary big bands. The
large, secondary colored areas in the these four
prints reveals banding. The tinted bands in the
second, third and fourth print run from 20, 30, 40,
50, 60, 70 and 80% tints of the secondary colors
blue, green and red.
Look for: Vertical "bars" or bands of much lighter
color or a different hue running in-line in one or more
of the solid fills.
Causes: Banding is caused by color-to-color
misregistration inherent in the fabrication of the jet.
Make sure that the drum temperature sensor is
correctly mounted and in proper, even contact with
the drum. Ensure the printhead-to-spacing is
correct. Then use the PC diagnostics to ensure that
the printhead and drum thermals are correct. A
weak jet can cause banding; refer to Test Print 2. If
necessary, remove the sensor and check it for an
accumulation of debris at its contact point. As a last
resort, replace the printhead.
B-2 Phaser 380 Color Printer
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74 75 76 77 78 79 80
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Banding
Weak jet
9661-158
9661-159