Samsung CKE5507 Alignment and Adjustments

6-1-1 Before Making Adjustments

6-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

6-1-1 (b) MAGNETIC FIELDS

Whenever possible, use magnetic field isolation equipment such as a Helmholtz field to surround the monitor. If a Helmholtz field is not available, frequently degauss the unit under test.

Caution: Other electrical equipment may cause

external magnetic fields which may interfere with monitor performance.

Use an external degaussing coil to limit magnetic build up on the monitor. If an external degaussing coil is not available, use the internal degaussing circuit. However, do not use the internal degaussing circuit more than once per 30 minutes.

6-1-1 (c) WARM-UP TIME

The monitor must be on for 30 minutes before starting alignment procedures. Warm-up time is especially critical in Color Temperature and White Balance adjustments.

6-1-1 (d) SIGNAL

Analog, 0.714 Vp-p positive at 75 ohm, internal termination Sync: Separate (TTL level negative/positive)

6-1-1 (e) SCANNING FREQUENCY

Horizontal: 30 kHz to 61 kHz (automatic) Vertical: 50 Hz to 120 Hz (automatic)

Unless otherwise specified, adjust at the 800 x 600 mode (H : 53.7 kHz, V: 85 Hz) signals.

Refer to Table on page 3-3.

6-1-1 (f) CENTER RASTER

Adjust SW401 so that the back raster comes to the center when you apply a signal of 60 kHz/75 Hz.

6-1-1 (g) MINIMUM SIZE ADJUSTMENT

Scanning frequency: 60 kHz/75 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Check the horizontal size 252 mm ± 2 mm by using VR401.

6-1-1 (h) BRIGHTNESS AND CONTRAST

Unless otherwise specified, adjust External VRs. Brightness: Maximum (turn knob fully clockwise)

Contrast: Maximum (turn knob fully clockwise)

CKE5507L/LM 6-1

6 Alignment and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor. Directions are given for adjustments using the monitor Interface Board Ver. 2.0 and software (SoftJig).

6-1 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.

6-1-2 Required Equipment

The following equipment may be necessary for adjustment procedures:

6-1-2 (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: 800 x 600 @ 85 Hz, or 1024 x 768 @ 75 Hz (minimum).

6. Required software: Softjig.exe from Samsung, Samsung DM200, or DisplayMate for Windows from Sonera Technologies

7. Interface Board Ver. 2.0 Code No. BH81-90001K

8. Parallel communications cable (25-pin to 25-pin); Code No. BH81-90001H

9. Signal cable (15-pin to 15-pin cable with additional 3-pin connector); Code No. BH81-90001J

10. 5 V DC adapter, not supplied

Note: SoftJig Assembly (includes items 8, 9 and 10

Code No. BH81-90001L

6-1-2 (b) COLOR ADJUSTMENTS

1. All equipment listed in 6-1-2 (a), above

2. Color analyzer, or any luminance measurement equipment

6-1-3 Connecting the SoftJig

Connect the monitor to the signal generator and/ or PC as illustrated in Figures 6-1 and 6-2.

Note: The signal cable connector which includes

the 3-wire cable must connect to the monitor. If you use Setup 2 (PC only, no signal generator) you can only make adjustments to the signal timing available on that computer system. To make corrections to all factory timings requires the use of an additional signal generator.

6-1-4 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.

6 Alignment and Adjustments

6-2 CKE5507L/LM

MONITOR

INTERFACE BOARD VER. 2.0

SIGNAL GENERATOR

7 PIN MINI DIN CONNECTOR

SIGNAL CABLE

5V DC ADAPTOR

PARALLEL CABLE

Figure 6-1. Setup 1, With Signal Generator

MONITOR

INTERFACE BOARD VER. 2.0

7 PIN MINI DIN CONNECTOR

SIGNAL CABLE

PARALLEL CABLE

D-SUB CONNECTOR

5V DC ADAPTOR

Figure 6-2. Setup 2, Without Signal Generator

6-2-1 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: 267 mm (H) x 200 mm (V)

Adjust the horizontal position and vertical position to within 4.0 mm of the center point of the screen.

l A - B l ≤ 4.0 mm. l C - D l ≤ 4.0 mm.

6-2-1 (a) HORIZONTAL SIZE ADJUSTMENT CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Adjust the horizontal size of the display pattern to 267 mm. (Tolerance ± 3 mm.)

6-2-1 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Adjust the vertical size of the display pattern to 200 mm. (Tolerance: ± 3 mm.)

6-2-1 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz Display image: Crosshatch pattern

PROCEDURE

Center the test pattern on the raster.

6-2-1 (d) VERTICAL POSITION ADJUSTMENT CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz Display image: Crosshatch pattern

Center the test pattern on the raster.

6-2-2 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 Tables 6-1 and 6-2, an image appears distorted, elongated or squashed.

The formular of linearity (%)

Table 5-1. Standard Modes Linearity: 800x600/85Hz

Table 5-2. Other Modes Linearity: VGA, SVGA, XGA,

MAC, etc.

6-2-3 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz Display image: Crosshatch pattern

Make the the test pattern rectangular.

Figure 6-4. Trapezoid

6 Alignment and Adjustments

CKE5507L/LM 6-3

6-2 Display Control Adjustments

DISPLAY AREA

EDGE OF BEZEL

Figure 6-3. Centering

Supported Timing Mode

Each block (14 %)

Difference between

adjacent blocks (5 %)

Standard Timing Modes

Each block (10 %)

Difference between

adjacent blocks (4 %)

2 x (Max – Min)

= x 100

Max + Min

| A - B | < 4 mm

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