4 Alignment and Adjustments
AP17K*/AP17J*
4-7
PROCEDURE
Measure luminance at nine points on the display
screen (see figure below).
4-3-4 Focus Adjustment
CONDITIONS
Scanning frequency:
68 kHz/85 Hz
(1024 x 768)
Display image:
“H” character pattern
Brightness:
Cut off point
Contrast:
Maximum
PROCEDURE
1. Adjust the Focus VR on the FBT to display the
sharpest image possible.
2. Use Locktite to seal the Focus VR in position.
4-3-5 Color Purity Adjustment
Color purity is the absence of undesired color.
Conspicuous mislanding (unexpected color in a
uniform field) within the display area shall not be
visible at a distance of 50 cm from the CRT
surface.
CONDITIONS
Orientation:
Monitor facing east
Scanning frequency:
68 kHz/85 Hz
Display image:
White flat field
Luminance:
Cut off point at the center
of the display area
Note:
Color purity adjustments should only be
attempted by qualified personnel.
PROCEDURE
For trained and experienced service technicians
only.
Use the following procedure to correct minor
color purity problems:
1. Make sure the display is not affected by
external magnetic fields.
2. Make sure the spacing between the PCM
assembly and the CRT stem is 29 mm ± 1 mm.
3. Display a green pattern over the entire display
area.
4. Adjust the purity magnet rings on the PCM
assembly to display a pure green pattern.
(Optimum setting: x = 0.295 ± 0.015,
y = 0.594 ± 0.015)
5. Repeat steps 4 and 5 using a red pattern and
then again, using a blue pattern.
Table 4-4. Color Purity Tolerances
(For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02)
6. When you have the PCMs properly adjusted,
carefully glue them together to prevent their
movement during shipping.
Red:
x = 0.640 ± 0.015
y = 0.323 ± 0.015
Green:
x = 0.295 ± 0.015
y = 0.594 ± 0.015
Blue:
x = 0.142 ± 0.015
y = 0.066 ± 0.015
Figure 4-10. Luminance Uniformity Check Locations
Summary of Contents for AP17J series
Page 7: ...2 Product Specifications 2 4 AP17K AP17J Memo ...
Page 17: ...4 Alignment and Adjustments 4 8 AP17K AP17J Memo ...
Page 36: ...AP17K AP17J 6 1 6 Exploded View and Parts List ...
Page 37: ...6 Exploded View Parts List 6 2 AP17K AP17J Memo ...
Page 55: ...Memo 7 Electrical Parts List 7 18 AP17K AP17J ...
Page 56: ...8 Block Diagrams AP17K AP17J 8 1 ...
Page 57: ...Memo 8 Block Diagrams 8 2 AP17K AP17J ...