NEC MultiSync FP1370 Service Manual page 85

3. CRT
[A] CRT face plate defect
1. Inspection condition
1) In the operating condition, observe the defect on the screen under following condition :
9,300K (Δx=0.281, Δy=0.311)
white raster or the element monochrome raster which its brightness is 34cd/m
center surrounding light is about 10 Lux
2) In the non-operating condition, observe the defect of the screen under light of about 200 Lux,
measured at the faceplate.
3) Inspection shall be made more than 45 cm away from the screen.
4) Observe the screen on white raster and each monochrome color of red, green, and blue.
2. Division of zone
A screen is divided into following 2 zones.
Zone A: Area inside the rectangle that its size measures H: 395 mm, V: 295 mm in the center of screen.
Zone B: Area outside the above rectangle
3. Limits
3-1. CRT face defect
3-1-1. Distance (minimum distance)
3-1-2. Average diagram
Turn of
3-1-3. Limit
- Dark spot, Blocked aparture
Average diameter(mm)
0.51 ～
0.31 ～ 0.50
0.15 ～ 0.30
- Discoloration, stain, Missing phospher, etc.
Average diameter(mm)
0.51 ～ 0.75
0.15 ～ 0.50
Note 1: No missing spot larger than specified are allowed in Zone A.
Note 2: The spec. applies to each color.
!
a b a
!
2 b
or small value into an on the average diameter. (a: length, b: width)
2 20
A
0
0
6 (note 1)
A
0
2
a
b
B A + B
0
0
6 (note 1) 10 (note 1)
B A + B
1
3
6-5
2
(10ft･L) on the screen
minimum distance
0 -
0 -
10 mm
minimum distance
- 20 mm
- 20 mm