Tektronix Phaser 550 Service Manual page 230

Interpreting Service Print 2
1 Service Print 2 is useful for evaluating the condition of the
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imaging unit. With a properly functioning imaging unit and printer,
you should see the following:
1. Diagonal lines. These two lines should be smooth and
unbroken.
2. Crosshairs. A thin white crosshair should be visible in each
block square. As the photoconductive belt ages and fatigues,
the crosshair in the top box will disappear followed in time by
the lower crosshairs. The belt may "rejuvenate" after a few
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hours of non-use, but this will only last for a few prints before
fatigue sets in again.
3. Fine parallel lines. Distinct parallel lines, both horizontal and
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vertical, should be viewable. No mottling or blending should be
seen. All vertical lines should be identical in appearance and
thickness to their horizontal counterparts.
4. 2 pt. text. The 2point text, the smallest printed on the test print,
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should be easily readable.
5. Registration. Thin horizontal composite black lines will show
misconvergence if each pass of the accumulator belt does not
properly register with each pass of the photoconductive belt.
6. Blended fills. The fills should be smooth and even in both the
primary and secondary color fills.
9013-74
Test Prints
Service Manual B-8
B