BenQ PB8220 - XGA DLP Projector, Service Manual

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3.2 Test Sequence
Tests shall be run in the sequence listed in Table 1.
TABLE 1. Image Quality Specification
SEQ # TEST SCREEN ACCEPTANCE CRITERIA
1 Major Dark Blemish Two Zone Blue 60 1.
No blemish will be darker than Microsoft Blue 60
in the Critical Zone
2.
 2 blemishes in the Non-Critical Zone
3.
No blemish will be > ½” long/diameter
2 Major Light Blemish Two Zone Gray 10
1.
No blemish will be lighter than Microsoft Gray 10 in
the Critical Zone
2.
 2 blemishes in the Non Critical Zone
3.
No blemish will be > ½” long/diameter
3 Eyecatcher Gray 10
1.
No eyecatcher will be lighter than Microsoft Gray 10
Streaks Blue 60
Gray 10
White
1.
No streaks
Projected Images Any screen 1. No adjacent pixels
2. No bright pixels (Active Area)
3.  1 bright pixel (SOM)
4.  4 dark pixels
5.  6 minor blemishes
6. No DMD window aperture shadowing on the Active
Area
7. No unstable pixels in Active Area
Notes:
1. Projected blemish numbers include the count for the shadow of the artifact in addition to the
artifact itself, so that the count usually represents a single artifact on the window.
2.
3.
4.
5.
6.
No blemish shall be more than 5 inches long or have a total area of more than 5 square
inches on a 60 inch diagonal projected image. ( ½ inch for Major Blemish tests)
During all Table 1 tests, projected images shall be inspected in accordance with the
conditions of inspection specified in Section 3.
The rejection basis for all cosmetic DMD defects (scratches, nicks, particles) will be the
projected image tests referenced in Table 1.
Any other image quality issue not specifically defined in this document shall be
acceptable.
Black screens shall not be used as a basis for rejecting DMDs for image quality.
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