BenQ SX930 Service Manual page 167

2-1. Projector Focus adjusted to "best uniform" within 3 min. after power on. (zoom/focus
positions are fixed throughout the test)
2-2. Projector Focus Quality Test at initial power on (tests shall be done within 3 min. after
power on)
2-3. The burning period to use the Full white pattern in Default mode.
2-4. Projector Focus Quality Test after power on for 30 min
2-5. After cooling 1 hrs without any focus adjustment and re-turn on to do the Projector
Focus Quality Test from 3min. to 30min. at initial power on .
3. Test Setup:
3-1. Projectors used for this test should be kept non-operated for at least 1 hour under room
temperature.
3-2. Focus Quality Test:
1) Focus Test Setup: Follow B201 definition (throw distance, image size)
2) Test Items: Focus Pattern 区 Pattern, Defocus, Flare,( E pattern for Specific lens)
4. Judgment Criteria: Test results satisfied below conditions will be judged as "Pass".
4-1. Focus Pattern(區 pattern) judgment remained OK. (If pattern can be focused, then pass! If
dubitable, check 4-2, 4-3)
4-2. Defocus/Flare deviation ≦ 1.0 pixels while comparing measured values of "Initial" vs. "30
min. after power on".
4-3 Defocus/Flare: Don't allow double pixel after thermal Drift.
4-4 Regarding Specific lens, if the area can't pass 4-1, please change to E pattern and compare to
E pattern limit sample. If the clear status is not worse than E pattern limit sample, it pass.
Note:
2-1 ~ 2-4: 冷開機調整測試
2-5 focus drift recycle 測試
Specific Lens List as below:
1. UST2/UST3
2. Zoom1 for XGA/WXGA
A.25.2 Projection Lens Thermal Reliability Test (熱變異測試)::
1. Purpose: To Verify Projection Lens (Focus) Quality with Baking Process
2. Test Procedure:
2-1. Focus Quality Test Before Baking
2-2 Baking Process
2-2. Focus Quality Test After Baking
3. Test Setup:
3-1. Baking Process
1) Condition: 60℃ x 48hrs
2) Projection Lens FAI Stage: Lens units Baking Only (Min. 14pcs)
3) RD EVT Stage: Projector Baking (Min. 2 units)
3-2. Focus Quality Test:
1) Focus Test Setup: Follow B201 definition (throw distance, image size)
2) Test Items: Focus Pattern(区 Pattern), Defocus, Flare
4. Judgment Criteria: Test results satisfied below conditions will be judged as "Pass".
4-1. Focus Pattern judgment remained OK. (Criteria follow B201)
4-2 Defocus/Flare deviation ≦ 1.0 pixel comparing measured values of "After" vs. "Before"
Baking Process.
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