Samsung HCR4755WX/XAA, Service Manual

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Alignment & Adjustment
Samsung Electronics 2-11
2-4-3 Sub-Brightness Adjustment
1. Input a sub-brightness adjustment signal. (TOSHIBA PATTERN)
2. In the stand-by mode, press the remote-control keys in the following sequence :
3. Select SBT by pressing the keys.
4. Adjust so that the 63 step on the right side of the screen is not seen (Use the keys).
5. Press the Menu key to exit.
2-4-4 Static Focus Adjustment
Precaution
1. Select the "STANDARD" video mode.
2. Input a crosshatch pattern.
3. Cover the lenses that are not being adjusted.
4. Connect a convergence jig and read data.
5. Adjust the lens for best focus. (See Fig, 2-1)
Static Focus (continued)
Vary the focus pack VR (Red, Blue) on the front cabinet. Adjust the TV for best possible focus around the center of the
crosshatch pattern, without losing overall screen balance. Figure Crosshatch Pattern Examine these points together.
2-4-5 Lens Focus Adjustment
1. Preparation
①
Set the Screen to "STANDARD". (Contrast : 100 / Brightness : 50)
②
Set the pattern to Crosshatch.
③
Adjust the electric focus before beginning.
④
Adjust the DY tilt (TILT) before beginning.
2. How to Adjust (Green Lens Adjustment)
①
Loosen the lens screw for easier adjustment.
②
Press Mute, 1, 8 and 3, sequentially to enter Convergence Mode.
③
Display only the Green pattern by using the +100, 0, and Previous Channel Keys in order to turn the R, G, and B patterns
On/Off respectively.
④
Turn the Green Lens clockwise/Counterclockwise to adjust for optimum status.
(Repeat if unsuccessful, varying the VR of the front Focus Pack.)
⑤
Perform steps 1~3 for the R and B Lenses.
3. Note
Green determines picture quality; pay close attention for exact adjustment.
Fig. 2-1 Crosshatch Pattern.
Examine these points together
P
L1
< _
L1, L2 P
L2
Red Chromatic Number Blue Chromatic Number
Fig. 2-2 Color Aberration