Samsung AQ17HS-IS-NS, AQ19MS-IS-NS-FS Alignment and Adjustments

4 Alignment and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor.
4-1 Adjustment Conditions
Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the
settings are not permanently stored and may be inadvertently deleted by the user.
4-1-1 Before Making Adjustments
4-1-1 (a) ORIENTATION
When servicing, always face the monitor to the east.
4-1-1 (b) WARM-UP TIME
The monitor must be on for 30 minutes before starting alignment. Warm-up time is especially critical in color temperature and white balance adjustments.
4-1-1 (c) SIGNAL
Analog, 0.7 Vp-p positive at 75 ohm, internal termination Sync: Separate/Composite (TTL level negative/positive)
Sync-on-Green: Composite sync 0.3 Vp-p negative (Video 0.7 Vp-p positive)
4-1-1 (d) SCANNING FREQUENCY
Horizontal: 30 kHz to 96 kHz (Automatic) Vertical: 50 Hz to 160 Hz (Automatic)
Unless otherwise specified, adjust at the 1024 x 768 mode (H: 68 kHz, V: 85 Hz) signals.
Refer to Table 2-1 on pages 2-2 and 2-3.
4-1-1 (e) HIGH VOLTAGE ADJUSTMENT
Signal: 1024 x 768 mode (68 kHz/85 Hz) Display image: Full white Contrast: Maximum Brightness: Maximum Limit: 26 kV ± 0.5 kV
(19”: 27 kV ± 0.5 kV)
Measure the hight voltage level at the anode cap. High voltage should be within the limit as above. If the high voltage needs adjustment use the Softjig.
4-1-1 (f) G2 (SCREEN) VOLTAGE
The Screen Voltage is fixed in the firm so don’t need to adjust the Screen voltage.
4-1-1 (g) CENTER RASTER
Adjust VR401 so that the back raster comes to the center when you apply a signal of 91 kHz/85 Hz.
4-1-2 Required Equipment
The following equipment may be necessary for adjustment procedures:
4-1-2 (a) DISPLAY CONTROL ADJUSTMENT
1. Non-metallic (–) screwdriver: 1.5 mm Non-metallic (–) screwdriver: 3 mm
2. Philips (+) screwdriver: 1.5 mm
3. Non-metallic hexkey: 2.5 mm
4. Digital Multimeter (DMM), or Digital Voltmeter (DVM)
5. Signal generator, or Computer with a video board that uses the ET-4000 chipset (strongly recommended if using Samsung DM 200 software) and that displays: 1280 x 1024 @ 85 Hz, or 1600 x 1200 @ 85 Hz (maximum).
6. Personal computer
4-1-2 (b) COLOR ADJUSTMENTS
1. All equipment listed in 4-1-2 (a), above
2. Color analyzer, or any luminance measurement equipmen
4-1-3 After Making Adjustments
After finishing all adjustments, test the monitor in all directions. If, for example, the monitor does not meet adjustment specifications when facing north, reposition the monitor to face east and readjust. This time, try for an adjustment closer to the ideal setting within the tolerance range. Test the unit again in all directions. If the monitor again fails to meet specifications in every direction, contact your Regional After Service Center for possible CRT replacement.
Adjust the screen VR of FST so that the G2 (screen) voltage it is 540 ± 10V (AQ19FS)
AQ17HS/AQ17IS/AQ17NS AQ19MS/AQ19IS/AQ19NS/AQ19FS
4-1
4 Alignment and Adjustments
4-2 Display Control Adjustments
4-2-1 Centering
Centering means to position the center point of the display in the middle of the display area. Horizontal size and position and vertical size and position control the centering of the display.
Adjust the horizontal size and vertical size to their optimal settings: 312 mm (H) x 234 mm (V). 1024 x 768 mode (68 kHz/85Hz)
Adjust the horizontal position and vertical position to 4.0 mm of the center point of the screen.
|A-B| 4.0 mm. |C-D| ≤ 4.0 mm.
C
DISPLAY AREA
A
D
Figure 4-3. Centering
4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to SIZE B+ to adjust the horizontal size of the display pattern to 312 mm (Tolerance: ± 3 mm) as the H_SIZE is 60 on the OSD.
4-2-1 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz /85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to V_SIZE to adjust the vertical size of the display pattern to 234 mm. (Tolerance: ± 3 mm.)
4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to H_POSI to center the horizontal image on the raster.
B
EDGE OF BEZEL
4-2-1 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
Click on the << or >> box next to V_POSI to center the vertical image on the raster.
4-2-2 Linearity
Linearity affects the symmetry of images as they appear on the screen. Unless each row or column of blocks in a crosshatch pattern is of equal size, or within the tolerances shown in Table 4-1 an image appears distorted, elongated or squashed.
Horizontal Linearity = 2x x100
Vertical Linearity = 2x x100
Preset mode
Pre-load mode (48kHz~) ≤ 5% ≤ 10%
Pre-load mode (under 48kHz) ≤ 5% ≤ 14%
Preset Mode : 68KHz / 85Hz
Pre-load Mode : Refer to Timing Chart
4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT
CONDITIONS
Scanning frequency: 68 kHz/85 Hz Display image: Crosshatch pattern Brightness: Cut-off Contrast: Maximum
To adjust the Horizontal Linearity, refer to Table 4-1 for the tolerance range.
Click on the << or >> box next to H_LIN to optimize the image.
(Horizontal x Vertical Size Table)
Horizantal 312 352
Vertical 234 264
X max-X min
X max+X min
Y max-Y min
Y max+Y min
Table 4-1
Adjacent Linearity
4% 8%
Table 4-2
17” 19”
Entire Linearity
4-2 AQ17HS/AQ17IS/AQ17NS
AQ19MS/AQ19IS/AQ19NS/AQ19FS
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