SAMSUNG CKA4217L Service Manual

COLOR MONITOR

CKA4217L

CKA4227L

CKA5227L

SERVICEManual

COLOR MONITOR

1. Precautions

2. Product Specifications

3. Operating Instructions

4. Disassembly & Reassembly

5. Alignment & Adjustments

6. Troubleshooting

7. Exploded View & Parts

8. Block Diagram

9. Wiring Diagram

10. PCB Diagrams &

11. Schematic Diagrams

Samsung Electronics Co., Ltd. September 1997

Printed in Korea

Code No.: BH68-60933A

1 Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock and X-rays.

1-1 Safety Precautions

1-1-1 Warnings

1.For continued safety, do not attempt to modify the circuit board.

2.Disconnect the AC power before servicing.

3.When the chassis is operating, semiconductor heatsinks are potential shock hazards.

1-1-2 Servicing the High Voltage System and

CRT

WARNING: Empty or damaged E2PROM may cause excessive x-ray emissions.

Caution: When replacing the E2PROM, IC203 a high voltage step must be adjusted until high voltage becomes 24.5 kV. Standard dump from Softjig does this.

1.When servicing the high voltage system, remove the static charge by connecting a 10k ohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead. (Disconnect the AC line cord from the AC outlet.)

2.High Voltage Adjustment

This monitor does not need to adjust high voltage, standard dump from Softjig automatically adjust the high voltage to 24.5kV.

3.It is essential that service technicians have an accurate high voltage meter available at all times. Check the calibration of this meter periodically.

4.When troubleshooting a monitor with excessively high voltage, avoid being unnecessarily close to the monitor. Do not operate the monitor for longer than is necessary to locate the cause of excessive voltage.

5.High voltage should always be kept at the rated value, no higher. Be sure all service personnel are aware of the procedures and instructions covering X-rays.

The only potential source of X-ray in current solid state display monitors is the tube. However, the CRT does not emit measurable X-ray radiation if the high voltage is at the high voltage adjustment value.

Only when high voltage is excessive are X-rays capable of penetrating the shell of the CRT, including the lead in glass material. Operation at high voltages may also cause failure of the CRT or high voltage circuitry.

6.When the high voltage regulator is operating properly, there is no possibility of an X-ray problem. Test the brightness and use a meter to monitor the high voltage each time a color monitor comes in for service. Make sure the high voltage does not exceed its specified value and that it is regulating correctly.

7.The CRT is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the CRT with only one that is the same or equivalent type as the original. Carefully reinstall the CRT shields and mounting hardware; these also provide X-ray protection.

8.Handle the CRT only when wearing shatterproof goggles and after completely discharging the high voltage anode.

9.Do not lift the CRT by the neck.

CKA42*7L/5227L

1-1

1 Precautions

1-1-3 Fire and Shock Hazard

Before returning the monitor to the user, perform the following safety checks:

1.Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.

2.Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.

	(READING SHOULD
	NOT BE ABOVE 0.5mA)
	LEAKAGE
DEVICE	CURRENT
UNDER	TESTER
TEST
	TEST ALL
	EXPOSED METAL
	SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
	EARTH
	GROUND

Figure1-1. Leakage Current Test Circuit

3.Leakage Current Hot Check (Figure 1-1):

WARNING: Do not use an isolation transformer during this test.

Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).

4.With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by ! on schmatics and parts lists. Asubstitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire and / or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.

Components identified by on schematics and parts lists must be sealed by a soldering iron after replacement and adjustment.

1-2	CKA42*7L/5227L

1 Precautions

1-2 Servicing Precautions

WARNINGS: An electrolytic capacitor installed with the wrong polarity might explode.

Cautions: Before servicing units covered by this service manual, read and follow the Safety Precautions section of this manual.

When replacing the E2PROM, high voltage step must be adjusted until high voltage becomes 24.5 kV. Standard dump from Softjig does this.

Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions.

1-2-1 General Servicing Precautions

1.Servicing precautions are printed on the cabinet, and should be followed closely.

2.Always unplug the unit’s AC power cord from the AC power source before attempting to:

(a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect a test component in parallel with an electrolytic capacitor.

3.Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

4.After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the area around the serviced part has not been damaged.

5.Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

6.Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500 V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.

7.Never defeat any of the +B voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.

8.Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.

CKA42*7L/5227L

1-3

1 Precautions

1-3 Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1.Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the monitor.

2.After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge.

3.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs.

4.Use only a grounded-tip soldering iron to solder or desolder ESDs.

5.Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ESDs.

6.Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

7.Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution: Be sure no power is applied to the chassis or circuit and observe all other safety precautions.

8.Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting your foot from a carpeted floor can generate enough static electricity to damage an ESD.

9. Indicates ESDs on the Schematic Diagram in this manual.

1-4	CKA42*7L/5227L

2 Product Specifications

2-1 Specifications

Item					Description
Picture Tube:	CKA42*7L: 14-Inch (36 cm); 13.2-Inch (33.5 cm) viewable, 90° Deflection,
	CKA5227L: 15-Inch (38 cm); 13.8-Inch (35 cm) viewable, flat-face tube, 90° Deflection,
	0.28 mm Dot pitch, Semi-tint, Non-glare, Antistatic silica coating, Invar shadow mask
Scanning Frequency	Horizontal	:	30 kHz to 55 kHz (Automatic)
	Vertical	:	50 Hz to 120 Hz (Automatic)
Display Colors	Unlimited colors
Maximum Resolution	Horizontal	:	1024 Dots
	Vertical	:	768 Lines
Input Video Signal	Analog, 0.714 Vp-p positive at 75 Ω , internally terminated
Input Sync Signal	Separate Sync : TTL level positive/negative
Maximum Pixel Clock	65 MHz
Active Display			CKA42*7L			CKA5227L
Horizontal	255 mm ± 3 mm (4:3 ratio)					267 mm ± 3 mm (4:3 ratio)
Vertical	191 mm ± 3 mm					200 mm ± 3 mm
Input Voltage	AC 90 to 264 Volts, 60 Hz/50 Hz ± 3 Hz
Power Consumption	73 Watt (max)
Dimensions			CKA42*7L			CKA5227L
Unit (W x D x H)	13.7 x 15.2 x 14.3 Inches (348 x 385 x 362.5 mm)					14.6 x 15.6 x 14.8 Inches (370 x 395 x 377 mm)
Carton (W x D x H)	16.6 x 18.1 x 15.4 Inches (422 x 460 x 390 mm)					17.9 x 19.6 x 17.0 Inches (454 x 497 x 433 mm)
Weight (Net/Gross)	CKA42*7L :		23.1 lbs (10.5 kg) / 27.3 lbs (12.4 kg)
	CKA5227L :		27.6 lbs (12.5 kg) / 30.9 lbs (14.0 kg)
Environmental Considerations	Operating Temperature			:	32°F to 104°F (0°C to 40°C)
					Humidity : 10 % to 80 %
	Storage Temperature			:	-4°F to 113°F (-20°C to 45°C)
					Humidity : 5 % to 95 %
CRT Code No.
• CKA42*7L/5227L complies with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.
• Designs and specifications are subject to change without prior notice.

CKA42*7L/5227L

2-1

2 Product Specifications

2-2 Pin Assignments

Sync	15-Pin Signal Cable Connector (Figure 2-1)
Type
Pin No.	Separate
1	Red
2	Green
3	Blue
4	GND
5	DDC Return
6	GND-R
7	GND-G
8	GND-B
9	Reserved
10	GND-Sync/Self-raster
11	GND
12	DDC Data
13	H-Sync
14	V-Sync
15	DDC Clock
	5
	15

Figure 2-1. Male Type

2-2	CKA42*7L/5227L

2 Product Specifications

2-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals.

Table 2-1. Timing Chart

Mode		IBM			VESA
	720/70 Hz	640/60 Hz	640/75 Hz	640/85 Hz	800/75 Hz	800/85 Hz	1024/60 Hz
Timing	720 x 400	640 x 480	640 x 480	640 x 480	800 x 600	800 x 600	1024 x 768
fH (kHz)	31.469	31.469	37.500	43.269	46.875	53.674	48.363
A µsec	31.777	31.778	26.667	23.111	21.333	18.631	20.677
B µsec	3.813	3.813	2.032	1.556	1.616	1.138	2.092
C µsec	1.907	1.907	3.810	2.222	3.232	2.702	2.462
D µsec	25.422	25.422	20.317	17.778	16.162	14.222	15.754
E µsec	0.636	0.636	0.508	1.556	0.323	0.569	0.369
fV (Hz)	70.087	59.940	75.000	85.008	75.000	85.061	60.004
O msec	14.268	16.683	13.333	11.764	13.333	11.756	16.666
P msec	0.064	0.064	0.080	0.069	0.064	0.056	0.124
Q msec	1.080	1.048	0.427	0.578	0.448	0.503	0.600
R msec	12.711	15.253	12.800	11.093	12.800	11.179	15.880
S msec	0.413	0.318	0.027	0.023	0.021	0.019	0.062
Clock
Frequency	28.322	25.175	31.500	36.000	49.500	56.250	65.000
(MHz)
Polarity
H.Sync	Negative	Negative	Negative	Negative	Positive	Positive	Negative
V.Sync	Positive	Negative	Negative	Negative	Positive	Positive	Negative
Remark	Separate	Separate	Separate	Separate	Separate	Separate	Separate

			Separate Sync
Horizontal				Vertical
Video				Video
C C	DD	E	E	Q Q	R R	S S
Sync				Sync
	B				P
	B				P
	A A				O O

	H/V Composite Sync
		VIDEO
A	Q	R	S
Horizontal	Vertical
	P	O
B

A : Line time total	B : Horizontal sync width	O : Frame time total	P : Vertical sync width
C : Back porch	D : Active time	Q : Back porch	R : Active time
E : Front porch		S : Front porch

CKA42*7L/5227L

2-3

2 Product Specifications

Memo

2-4	CKA42*7L/5227L

3 Operating Instructions

3-1 Front View and Controls

3-1-1 CKA4227L Front View

1

2

12	13	14	17	16	15
3					7
4					8
5					9
6					10
					11

Figure 3-1. Front Control Panel

Table 3-1. Front Panel Controls

Location	Symbol	Description
1		Power Button
		Power Indicator LED (Dual Color)
3		Horizontal Position Button
4		Vertical Position Button
5		Horizontal Size Button
6		Vertical Size Button
7		Contrast Control
8		Brightness Control
9		Trapezoid Button
10		Side Pincushion Button
11		Adjustment Buttons
12	+	Parallelogram
13	+	V-Linearity
14	+	Pinbalance Button
15	+	Degauss
16	+	Recall
17	+	User Delete

CKA42*7L/5227L

3-1

3 Operating Instructions

3-1-2 CKA5227L Front View

1

2

			18
12	13	14	17	16	15
3					7
4					8
5					9
6					10
					11

Figure 3-2. Front Control Panel

Table 3-2. Front Panel Controls

Location	Symbol	Description
1		Power Button
		Power Indicator LED (Dual Color)
3		Horizontal Position Button
4		Vertical Position Button
5		Horizontal Size Button
6		Vertical Size Button
7		Contrast Control
8		Brightness Control
9		Trapezoid Button
10		Side Pincushion Button
11		Adjustment Buttons
12	+	Parallelogram
13	+	V-Linearity
14	+	Pinbalance Button
15	+	Degauss
16	+	Recall
17	+	User Delete
18	+	Tilt (Optional)

3-2	CKA42*7L/5227L

3-1-3 CKA4217L Front View

1

2

12	13	14	17	16	15
3					7
4					8
5					9
6					10
					11

Figure 3-3. Front Control Panel

3 Operating Instructions

Table 3-3. Front Panel Controls

Location	Symbol	Description
1		Power Button
		Power Indicator LED (Dual Color)
3		Horizontal Position Button
4		Vertical Position Button
5		Horizontal Size Button
6		Vertical Size Button
7		Contrast Control
8		Brightness Control
9		Trapezoid Button
10		Side Pincushion Button
11		Adjustment Buttons
12	+	Parallelogram
13	+	V-Linearity
14	+	Pinbalance Button
15	+	Degauss
16	+	Recall
17	+	User Delete

CKA42*7L/5227L

3-3

3 Operating Instructions

Note 1: When used with a computer equipped with VESA DPMS functions, this monitor is EPA Energy Star compliant and NUTEK compliant.

Table 3-4. Display Power Management Signaling (DPMS); CKA42*7L

	State	Normal	Power saving function EPA/NUTEK
	Items	Operation	Stand-By	Suspend Mode	Power Off Mode
			Mode	Position A	Position B
	Horizontal Sync	Active	Inactive	Active	Inactive
	Vertical Sync	Active	Active	Inactive	Inactive
	Video	Active	Blanked	Blanked	Blanked
	Power		Green	Green	Green
		Green	Blinking (0.5	Blinking (1	Blinking (1 sec
	Indicator
			sec interval)	sec interval)	interval)
	Power	73 W (max.)	50 W	Less than	Less than
		55 W
	Consumption/hr		(nominal)	15 W	5 W
		(nominal)

Table 3-5. Display Power Management Signaling (DPMS); CKA5227L

	State	Normal	Power saving function EPA/NUTEK
	Items	Operation	Stand-By	Suspend Mode	Power Off Mode
			Mode	Position A	Position B
	Horizontal Sync	Active	Inactive	Active	Inactive
	Vertical Sync	Active	Active	Inactive	Inactive
	Video	Active	Blanked	Blanked	Blanked
	Power		Green	Green	Green
		Green	Blinking (0.5	Blinking (1	Blinking (1 sec
	Indicator
			sec interval)	sec interval)	interval)
	Power	73 W (max.)	50 W	Less than	Less than
		60 W
	Consumption/hr		(nominal)	15 W	5 W
		(nominal)

3-4	CKA42*7L/5227L

4 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the CKA42*7L/5227L monitors.

WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling these components.

4-1 Disassembly

Cautions:1. Disconnect the monitor from the power source before disassembly.

2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.

4-1-1 Cabinet Disassembly

1.With a pad beneath it, stand the monitor on its front with the screen facing downward and the base closest to you. Make sure nothing will damage the screen.

2.Press in the tab on the Cabinet Bottom and pull the Tilt and Swivel Base upward to remove it.

3.Working from the back of the monitor, remove the four screws and remove the Rear Cover.

4.Using pinch-nose pliers or long-nose pliers, carefully disconnect the Anode Cap from the CRT.

Caution: Do not touch the anode contact on the CRT.

4-1-2 Removing the CRT Socket PCB

1.Complete all previous steps.

2.Disconnect CRT and Main PCB ground wires on CRT Socket PCB and Shield Cover.

3.Desolder the 5 tabs on the underside of the CRT Socket PCB shield and remove the CRT Socket PCB Shield.

4.Using a knife, cut through the silicone bond and lift off the CRT Socket PCB.

5.Disconnect connectors CN102 and two ground wires on the CRT Socket PCB.

4-1-3 Removing the Main PCB

1.Complete all previous steps.

2.Disconnect Degaussing Coil at the CN601 connector on the Main PCB.

3.Disconnect all easily accessible ground wires on the Main PCB and Chassis Bottom.

4.Disconnect the DY connector between the DY and the CN301, CN302, CN502 and CN503 connector on the Main PCB.

5.Remove the screws on the back and along each side of the Chassis Bottom.

6.Carefully lift the Main PCB Ass’y.

7.Remove all other ground wires.

4-1-4 CRT Ass’y Disassembly

1.Complete all previous steps.

2.Straighten the Degaussing Coil Assembly coated metal ties and lift Coil Ass’y from the CRT.

3.Remove the four corner screws and lift the CRT up and away from the Front Cover Assembly and place it on a padded surface.

Caution: Do not lift the CRT by the neck.

If you will be returning this CRT to the monitor, be sure to place the CRT face downward on a protective pad.

CKA42*7L/5227L

4-1

4 Disassembly and Reassembly

4-2 Reassembly

With the CRT facing downward on a protective pad, use the steps that follow to reassemble the monitor.

4-2-1 Replacing the CRT

1.Loop the CRT Ground Ass’y around the back of the CRT and under the four corner metal ears. Position last the corner with the spring.

2.With the Front Cover Assembly lying face down on a protective pad, position the CRT so that the corner metal ears fit properly in the Front Cover Assembly.

3.Secure the CRT ground Ass’y and CRT at each of the four corners with the CRT screws.

4.Replace the Degaussing Coil Assembly and wrap the Coil with the plastic coated metal ties to hold the Coil in place.

4-2-3 Replacing the CRT Socket PCB

1.Lock the Focus (G3) wire on the CRT Socket and reconnect the Screen (G2) wire on the CRT Socket PCB.

2.Reconnect the CRT Socket on the CRT pins and apply silicon bond at the Plug/Socket Junction.

3.Replace the CRT and Main PCB ground wires on CRT Socket PCB and Shield Cover.

4.Reconnect the connectors CN102 to the CRT Socket PCB.

5.Solder the 5 tabs on the underside of the CRT Socket Shield.

4-2-2 Replacing the Main PCB

1.Stand the monitor on its front with the screen facing downward.

2.Slide the Main PCB into the Chassis Bottom and replace the wires and screws on the Chassis Bottom.

3.Position the Main PCB Ass’y in the front Cabinet and secure it with the screws.

4.Replace both side CRT ground wires on the Chassis Bottom.

5.Replace the Degaussing Coil at the CN601 connector on the Main PCB.

6.Replace the DY connector at the CN301, CN302, CN502 and CN503 connector on the Main PCB.

7.Replace all easily accessible ground wires on the Main PCB and Chassis Bottom.

8.Replace the Anode Cap.

4-2-4 Cabinet Reassembly

1.Complete all previous steps.

2.Position the Rear Cover marking sure the tabs along the front edge are properly snapped in place. Replace the four screws.

3.Snap the Tilt and Swivel Base into position.

4.Set the monitor on its Base and make sure that the CRT faceplate was not scratched or otherwise damaged.

4-2	CKA42*7L/5227L

5 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).

5-1 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.

5-1-1 Before Making Adjustments

5-1-1 (a) ORIENTATION

When servicing, always face the monitor to the east.

5-1-1 (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.

5-1-1 (f) +B 13 V LINE CHECK

No beam

Contrast: Maximum

Brightness: Maximum

Check the DC 13 V ± 0.2 V at Cathode of D616 Point and GND.

5-1-1 (g) HIGH VOLTAGE CHECK

No beam

Contrast: Maximum

Brightness: Maximum

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.

5-1-1 (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.

5-1-1 (d) SIGNAL

Analog, 0.714 Vp-p positive at 75 ohm, internal termination

Sync: Separate

(TTL level negative/positive)

5-1-1 (e) SCANNING FREQUENCY

Check the high voltage to 24.5 ± 0.5 kV at anode and GND.

5-1-1 (i) CENTER RASTER

Adjust SW401 so that the back raster comes to the center when you apply a signal of 53.7 kHz/

85 Hz.

5-1-1 (j) BRIGHTNESS AND CONTRAST

Unless otherwise specified, adjust brightness and contrast buttons:

Brightness: Maximum

(press button until the LED is blink)

Contrast: Maximum

(press button until the LED is blink)

Horizontal:	30 kHz to 55 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 2-5.

CKA42*7L/5227L

5-1

5 Alignment and Adjustments

5-1-2 Required Equipment

The following equipment may be necessary for adjustment procedures:

5-1-2 (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 800 x 600 @ 75 Hz (minimum).

6.Personal computer

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

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

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

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

11.5 V DC adapter, not supplied

Note: SoftJig Assembly (includes items 8, 9 and 10 Code No. BH81-90001L

5.1-2 (b) COLOR ADJUSTMENTS

1.All equipment listed in 5-1-2 (a), above

2.Color analyzer, or any luminance measurement equipment

5-2	CKA42*7L/5227L

5-1-3 Connecting the SoftJig

Connect the monitor to the signal generator and/ or PC as illustrated in Figures 5-1 and 5-2.

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.

		MONITOR
	INTERFACE
	BOARD VER. 2.0	SIGNAL CABLE
	5V DC
	ADAPTOR	7 PIN MINI DIN
		CONNECTOR
	PARALLEL CABLE
	PC	SIGNAL
		GENERATOR

Figure 5-1 : Setup 1, With Signal Generator

	5 Alignment and Adjustments
	MONITOR
INTERFACE
BOARD VER. 2.0
5V DC	7 PIN MINI DIN
	CONNECTOR
ADAPTOR
	SIGNAL CABLE
PARALLEL CABLE	D-SUB
PC	CONNECTOR

Figure 5-2. Setup 2, Without Signal Generator

5-1-4 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.

CKA42*7L/5227L

5-3

5 Alignment and Adjustments

5-2 Display Control Adjustments

5-2-1 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) for 15”, 255 mm (H) x 191 mm (V) for 14”

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.

	C
	DISPLAY AREA
A	B
	EDGE OF BEZEL
	D

Figure 5-1. Centering

5-2-1 (a) HORIZONTAL SIZE ADJUSTMENT

CONDITIONS
Scanning frequency:	53.7 kHz/85 Hz (15”)
	43.8 kHz/85 Hz (14”)
Display image:	Crosshatch pattern
Brightness:	Maximum
Contrast:	Maximum

Adjust the horizontal size of the display pattern to 267 mm (15”) and 255 mm (14”).

(Tolerance ± 3 mm.)

If horizontal size range cannot meet the spec adjust the VR401.

5-2-1 (b) VERTICAL SIZE ADJUSTMENT

CONDITIONS
Scanning frequency:	53.7 kHz/85 Hz (15”)
	43.8 kHz/85 Hz (14”)
Display image:	Crosshatch pattern
Brightness:	Maximum
Contrast:	Maximum

Adjust the vertical size of the display pattern to

200 mm (15”) and 191 mm (14”). (Tolerance: ± 3 mm.)

5-2-1 (c) HORIZONTAL POSITION ADJUSTMENT

CONDITIONS
Scanning frequency:	53.7 kHz/85 Hz (15”)
	43.8 kHz/85 Hz (14”)
Display image:	Crosshatch pattern

PROCEDURE

Center the test pattern on the raster.

5-2-1 (d) VERTICAL POSITION ADJUSTMENT

CONDITIONS
Scanning frequency:	53.7 kHz/85 Hz (15”)
	43.8 kHz/85 Hz (14”)
Display image:	Crosshatch pattern

Center the test pattern on the raster.

5-2-2 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 5-1 and 5-2, an image appears distorted, elongated or squashed.

The formular of linearity (%)

	2 x (Max – Min)
=		x 100
	Max + Min

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

Standard Timing Modes

Each block (10 %)

Difference between adjacent blocks (4 %)

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

MAC, etc.

Supported Timing Mode

Each block (14 %)

Difference between adjacent blocks (5 %)

5-4	CKA42*7L/5227L