SAMSUNG CHA4217L Service Manual

COLOR MONITOR

CHA4217L CHA4227L CHA5807L CHA5227L

Manual

SERVICE

COLOR MONITOR CONTENTS

1. Precautions

2. Reference Information

3. Product Specifications

4. Operating Instructions

5. Disassembly & Reassembly

6. Alignment & Adjustments

7. Troubleshooting

8. Exploded View & Parts List

9. Electrical Parts List

10. Block Diagram

11. PCB Diagrams

12. Wiring Diagram

13. Schematic Diagrams

Samsung Electronics Co., Ltd. August 1998 Printed in Korea Code No.: BH68-61127A

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.

1-1-1 Servicing the High Voltage VR

and CRT :

WARNING: Damaged IC202 may cause excessive

x-ray emissions.

1. When servicing the high voltage system, remove the static charge by connecting a 10 kohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead.

2. If the HV VR requires adjustment: This monitor does not need to adjust high voltage, high voltage step is saved at IC202, adjusting this high voltage to 24.5±0.5 kV - 14Ó, 25.0±0.5 kV - 15Ó.

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

4. High voltage should always be kept at the rated value, no higher. 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.

5. When the HV regulator is operating properly, there is no possibility of an X-ray problem. Make sure the HV does not exceed its specified value and that it is regulating correctly.

6. The CRT is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the CRT only with one that is the same or equivalent type as the original.

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

8. Do not lift the CRT by the neck.

1-1-2 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.

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 unitÕs 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.

Figure 1-1. Leakage Current Test Circuit

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 schematics and parts lists. A substitute 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.

CHA42*7L/5**7L 1-1

1 Precautions

1-1 Safety Precautions

DEVICE UNDER TEST

TEST ALL

EXPOSED METAL

SURFACES

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE CURRENT

TESTER

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

EARTH

GROUND

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

2. Always unplug the unitÕs 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 all test components 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.

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 wriststrap 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 Òanti-staticÓ can generate electrical charges sufficient to damage ESDs.

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 instrumentÕs ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrumentÕs ground lead last.

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 Precautions

1-2 CHA42*7L/5**7L

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 fieldeffect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1-2 Servicing Precautions

WARNING1: First read the “Safety Precautions” section of this manual. If unforeseen circumstances

create conflict between the servicing precautions and safety precautions, always follow the safety precautions.

WARNING2: An electrolytic capacitor installed with the wrong polarity might explode.

CHA42*7L/5**7L 2-1

2 Reference Information

2-1 List of Abbreviations, Symbols and Acronyms

2-1-1 Abbreviations

Abbreviation Definition Abbreviation Definition

ASS’Y Assembly B Blue B+ ADJ B+ Adjustment B-CUT Blue-Cutoff B-GAIN Blue Gain BRIGHT Brightness C R-Composition C-MIC Condenser Microphone CLK Clock CM R-Cement CN Connector CONT Contrast D-SUB D-Subminiature EEP-CLK Electrically Erasable and

Programmable Clock EXT External EXT-MIC External Microphone Freq. Frequency FU Fusible G Green G-CUT Green-Cutoff G-GAIN Green Gain GND Ground H Horizontal H Heater H-DRV Horizontal Drive H-DY Horizontal Deflection York H-FLB Horizontal Flyback H-FV Horizontal-Feedback Voltage H-LIN Horizontal Linearity H-POSI Horizontal Position H-SIZE Horizontal Size H/PHONE Headphone Hz Hertz I-SENSE Current-Sense lb Pound MAX Maximum MIC Microphone MIN Minimum MP C-Metalized Polyester MPP Metal Polypropylene MO R-Metal Oxide

OSC Oscillator P C-Polyester PARA Parabola PARALL Parallelogram PIN-BAL Pincushion Balance PRE-AMP Pre-Amplifier PS1 Power Saving1 (suspend) PS2 Power Saving2 (off) PWR Power R Red R-CUT Red-Cutoff R-GAIN Red Gain RST Reset S-PIN Side Pincushion S-RASTER Self Raster S/W Switch SCAP S Correction Capacitor SPK Speaker SYNC Synchronization T C-Tantalum TR Transistor TRAP Trapezoid U-COM Microprocessor V Vertical V-DY Vertical Deflection York V-FLB Vertical Flyback V-LIN Vertical Linearity V-MUTE Video Mute V-OUT Vertical Output V-PARA Vertical Parabola V-POL V-Polarity V-POSI Vertical Position V-SENSE Voltage-Sense V-SIZE Vertical Size WW R-Wire Wound X-TAL Crystal Ω ohm KΩ 1000 ohm MΩ 1000 KΩ uF microfarad (10-6F) nF nanofarad (10-9F) pF picofarad (10

-12

2 Reference Information

2-2 CHA42*7L/5**7L

Acronym Definition Acronym Definition

ABL Automatic Brightness Limits AC Alternating Current ACL Automatic Contrast Limit AFC Automatic Frequency Control ANSI American National Standards Institute CMOS Complementary Metal Oxide

Semiconductor CRT Cathode Ray Tube DC Direct Current DDC Data Display Channel DF Dynamic Focus DMM Digital Multimeter DPMS Display Power Management Signaling DVM Digital Voltmeter DY Deflection York EEPROM Electrically Erasable and

Programmable Read only Memory ESD Electrostatically Sensitive Device ESF Electronic Static Field FBT Flyback Transformer FET Field Effect Transistor FH Horizontal Frequency FS Fail Safe FV Vertical Frequency GD Geometric Distortion

H/V Horizontal/Vertical HV High Voltage I/O Input/Output IC Integrated Circuit LED Light Emitting Diode MAC Macintosh MOFA Mask Outside Frame Assemble OCP Over Current Protection OP AMP Operational Amplifier OSD On Screen Display P-P Peak to Peak PCB Printed Circuit Board PLL Phase Locked Loop PWM Pulse Width Modulation SMPS Switch Mode Power Supply SVGA Super Video Graphics Array SWEDAC TP Test Point UL Underwriters Laboratories USB Universal Serial Bus VESA Video Electronics Standard

Association VGA Video Graphics Array VR Variable Registor W/B White Balance

2-1-2 Acronyms

2-1-2 Symbols

Can emit X-radiation

Hot Ground

Cold Ground

Electrostatically Sensitive Device (ESD)

Provides special safety considerations

CHA42*7L/5**7L 3-1

3 Product Specifications

3-1 Specifications

Picture Tube: CHA42*7L: 14-Inch (36 cm); 13.2-Inch (33.5 cm) viewable, 90° Deflection,

CHA5**7L: 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) - 14” / 30 kHz to 61 kHz (Automatic) - 15”

Vertical: 50 Hz to 125 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 14” : 65 MHz, 15” : 85 MHz Active Display 14” 15”

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 Dimensions 14” 15”

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) CHA42*7L : 23.1 lbs (10.5 kg) / 27.3 lbs (12.4 kg)

CHA5**7L : 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.

• CHA42*7L/5**7L complies with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.

• Designs and specifications are subject to change without prior notice.

Item Description

3 Product Specifications

3-2 CHA42*7L/5**7L

3-2 Pin Assignments

Sync Type

Pin No.

15-Pin Signal Cable Connector (Figure 3-1)

Separate

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

Red Green Blue GND DDC Return GND-R GND-G GND-B Reserved GND-Sync/Self-raster GND DDC Data H-Sync V-Sync DDC Clock

Figure 3-1. Male Type

3 Product Specifications

CHA42*7L/5**7L 3-3

fH (kHz) A µsec B µsec C µsec D µsec E µsec fV (Hz) O msec P msec Q msec R msec S msec Clock

Frequency (MHz)

Polarity H.Sync

V.Sync Remark

IBM VESA

800/85 Hz 800 x 600

1024/60 Hz 1024 x 768

(14”)

1024/75 Hz 1024 x 768

(15”)

640/60 Hz 640 x 480

720/70 Hz 720 x 400

31.469

31.777

3.813

1.907

25.422

0.636

70.087

14.268

0.064

1.080

12.711

0.413

28.322

Negative

Positive

Separate

31.469

31.778

3.813

1.907

25.422

0.636

59.940

16.683

0.064

1.048

15.253

0.318

25.175

Negative Negative Separate

37.500

26.667

2.032

3.810

20.317

0.508

75.000

13.333

0.080

0.427

12.800

0.027

31.500

Negative Negative Separate

43.269

23.111

1.556

2.222

17.778

1.556

85.008

11.764

0.069

0.578

11.093

0.023

36.000

Negative Negative Separate

46.875

21.333

1.616

3.232

16.162

0.323

75.000

13.333

0.064

0.448

12.800

0.021

49.500

Positive Positive

Separate

53.674

18.631

1.138

2.702

14.222

0.569

85.061

11.756

0.056

0.503

11.179

0.019

56.250

Positive Positive

Separate

48.363

20.677

2.092

2.462

15.754

0.369

60.004

16.666

0.124

0.600

15.880

0.062

65.000

Negative Negative Separate

60.023

16.660

13.003

3.658

13.206

3.454

75.029

13.328

12.795

0.533

12.812

0.516

78.750

Positive Positive

Separate

800/75 Hz 800 x 600

640/75 Hz 640 x 480

640/85 Hz 640 x 480

3-3 Timing Chart

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

QRS

Video

Sync

Horizontal

Vertical

CDE

Video

Sync

Separate Sync

Table 3-1. Timing Chart

Mode

Timing

C D

Video

Sync

Video

Q R S

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

VIDEO

Horizontal

Vertical

H/V Composite Sync

Memo

3 Product Specifications

3-4 CHA42*7L/5**7L

CHA42*7L/5**7L 4-1

Location Symbol Description

1 Power Button

Power Indicator LED

Adjustment Buttons Side Pincushion Button

Horizontal Position Button

Trapezoid Button Brightness Control Contrast Control Parallelogram V-Linearity Pinbalance Button Degauss Recall User Delete Tilt (Option: 15”) V-Moire

Vertical Size Button

Vertical Position Button Horizontal Size Button

3 4

9 10 11 12 13 14 15 16 17 18 19

14 17

45186 7 8 9 10 11

Table 4-1. Front Panel Controls

Figure 4-1. Front Control Panel

+ + + + + + + +

4 Operating Instructions

4-1 Front View and Control

Note 1: This monitor requires a cable adapter for

use with a Macintosh computer. The MacMaster Cable Adapter supports all monitors and all Macintosh, Centris, Quadra, Duo Dock, and Power Macintosh computers. If you do not already have a cable adapter, check with your computer dealer.

Note 2: When used with a computer equipped

with VESA DPMS functions, this monitor is EPA Energy Star compliant and NUTEK compliant.

4 Operating Instructions

4-2 CHA42*7L/5**7L

State

Items

Normal

Operation

Horizontal Sync Vertical Sync Video

Power Indicator

Power Consumption/hr

Active Active Active

Green

Green Blinking (0.5 sec interval)

Green

Blinking (1 sec

interval)

73 W (max.)

60 W

(nominal)

Less than

15 W

50 W

(nominal)

Less than

5 W

Inactive

Active

Blanked

Active Inactive Blanked

Power saving function EPA/NUTEK

Stand-By

Mode

Suspend Mode

Position A

Power Off Mode

Position B

Inactive Inactive Blanked

Table 4-2. Display Power Management Signaling (DPMS)

5-1-1 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. Working from the back of the monitor, remove the four screws and remove the Rear Cover.

3. 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.

5-1-2 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 CN103 on the CRT Socket PCB.

6. Using a solder iron, disconnect CN202_2.

7. Disconnect CRT Socket and Focus (G3) wires on CRT Socket PCB.

8. Place Video PCB on a flat, level surface that is protected from static electricity.

5-1-3 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 AssÕy.

7. Remove all other ground wires.

5-1-4 CRT Ass’y Disassembly

1. Complete all previous steps.

2. Straighten the Degaussing Coil Assembly coated metal ties and lift Coil AssÕy 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.

CHA42*7L/5**7L 5-1

5 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the CHA42*7L/5**7L monitors.

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

these components.

5-1 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.

5 Disassembly and Reassembly

5-2 CHA42*7L/5**7L

Memo

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 55 kHz (automatic)-14Ó

30 kHz to 61 kHz (automatic)-15Ó

Vertical: 50 Hz to 120 Hz (automatic) Unless otherwise specified, adjust at the 800 x 600

mode (H : 53.7 kHz, V: 85 Hz)-15Ó, the 640 x 480 mode (H : 43.8 kHz, V: 85 Hz)-14Ó signals.

Refer to Table on page 3-3.

6-1-1 (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.

6-1-1 (g) HIGH VOLTAGE CHECK

No beam Contrast: Maximum Brightness: Maximum

Check the high voltage to 24.5 ± 0.5 kV - 14Ó,

25 ± 0.5 kV - 15Ó at anode and GND.

6-1-1 (i) CENTER RASTER

Adjust VR502 so that the back raster comes to the center when you apply a signal of 53.7 kHz/ 85 Hz - 14Ó, 60 kHz/75 Hz - 15Ó .

6-1-1 (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)

CHA42*7L/5**7L 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 (Ð) screwdriver: 1.5 mm Non-metallic (Ð) 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

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 CHA42*7L/5**7L

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) for 15Ó, 255 mm (H) x 191 mm (V) for 14Ó

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

l A - B l ² 5.0 mm. l C - D l ² 5.0 mm.

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

Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

PROCEDURE

Horizontal minimum size can be adjusted as follows using Softjig.

1. Display the timing 800 x 600/85 Hz (15Ó),

640 x 480/85 Hz (14Ó).

2. Adjust horizontal size to minimum size using

H_SIZE.

3. Adjust horizontal minimum size to 250 mm

(15Ó) or 242 mm (14Ó) using H_SIZE MIN.

4. Adjust horizontal size to 267 mm (15Ó) or

255 mm (14Ó) using H_SIZE.

5. Press the ALL MODE SAVE horizontal

minimum size for each timing is saved automatically.

If horizontal minimum size range cannot meet the spec, horiontal maximum size of 640 x 480/75 Hz including 800 x 600/60 Hz, 56 Hz, may be saturated or cannot overscan the bezel.

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

Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum

Adjust the vertical size of the display pattern to

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

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

Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) 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 (15Ó)

43.3 kHz/85 Hz (14Ó) 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 6-1. Standard Modes Linearity: 800 x 600/85Hz - 15”

640 x 480/85 Hz - 14”

Table 6-2. Other Modes Linearity: VGA, SVGA, XGA,

MAC, etc.

6 Alignment and Adjustments

CHA42*7L/5**7L 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

6-2-3 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó)

Display image: Crosshatch pattern Make the the test pattern rectangular.

Figure 6-4. Trapezoid

6-2-4 Parallelogram Adjustment

CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó)

Display image: Crosshatch pattern To activate the Parallelogram Adjustment

function, push both the Horizontal Position and Vertical Position buttons and hold them in for longer than 3 seconds, or until the power indicator LED changes from green to blink and back to green.

Use the Increase (+) and Decrease (Ð) buttons to correct the display shape.

Figure 6-5. Parallelogram

6-2-5 Side Pincushion Adjustment

CONDITIONS

Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó)

Display image: Crosshatch pattern After pushing the Side Pincushion button once,

push the Increase (+) and Decrease (Ð) buttons to straighten the sides of the test pattern.

6-2-6 CRT Tilt Adjustment

TILT ADJUSTMENT (CHA5807L With Tilt)

Push the V-Posi and H-Size simultaneously until Led blinks and back on again. Push the Increase (+) and Decrease (Ð) buttons to correct the Tilt.

6-2-7 Vertical Linearity Adjustment

To activate the vertical linearity adjustment, push both the horizontal position and horizontal size buttons and hold then in for longer than 3 seconds, or until the power indicator LED changes from green to blink and back to green.

Use the Increase (+) and Decrease (Ð) buttons to correct the display shape.

6-2-8 Pin Balance Adjustments

To activate the pin balacne function, push both the horizontal position and vertical Size buttons and hold then in for longer than 3 seconds, or until the power indicator LED changes from green to blink and back to green.

Use the Increase (+) and Decrease (Ð) buttons to correct the display shape.

6-2-9 Degauss

Push the contrast and brightness buttons simultaneously. The degaussing circuit can effectively function only once per 30 minutes. If available, use an external degaussing coil during servicing.

6-2-10 Delete User Mode Data

To delete the picture data from the user modes, push the contrast button and side pincushion button for 5 or more seconds simultaneously.

6-2-11 Recall

To delete the picture data from current user mode, push the contrast button and trapzoid button for 5 or more seconds simultaneoulsy.

6 Alignment and Adjustments

6-4 CHA42*7L/5**7L

2.2 mm 2.2 mm

| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.2 mm.

Figure 6-6. Pincushion

FRONT BEZEL BACK RASTER

Figure 6-7. CRT Tilt Adjustment

2.2 mm 2.2 mm

2.2 mm

Note 1: Color adjustment of this mode is controled

by Micom Jig or software.

Note 2: To make color adjustments you must have

a color analyzer and one of the following configurations:

1. Signal Generator or

2. Computer with Samsung DM 200 software or DisplayMate for Windows software from Sonera Technologies

3. In case of CHA5**7L, use 800 x 600 mode signal (53.7 kHz/85 Hz) for adjustments, in case of CHA42*7L, use 640 x 480 mode signal (43.3 kHz/85 Hz).

Before making adjustments, check that the video signals are as follows:

Video : Analog, 0.714 Vp-p (at 75 ½ termination) Sync : Separate TTL level

Unless otherwise specified, use 800 x 600 mode signal (53.7 kHz/85 Hz) for adjustments.

6-3-1 Color Coordinates (Temperature)

Color temperature is a measurement of the radiant energy transmitted by a color. For computer monitors, the color temperature refers to the radiant energy transmitted by white. Color coordinates are the X and Y coordinates on the chromaticity diagram of wavelengths for the visible spectrum.

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó)

Display image: White flat field at

center of display area

Luminance: Maximum

PROCEDURE

Using the directions in sections 6-3-2 through 6-3-5, adjust the Color Coordinates for 9300K to x = 0.283 ± 0.02 and y = 0.298 ± 0.02

6-3-2 Back Raster Color Adjustment

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: Back raster pattern Brightness: Maximum Contrast: Maximum

PROCEDURE

1. Adjust the Screen VR on the FBT so that the brightness of the Back Raster is 0.3 to 0.5 ft-L (typically 0.4 ft-L).

2. Adjust the G_CUT to center.

3. Adjust the B_CUT to set the ÒyÓ coordinate to

0.298 ± 0.02.

4. Adjust the R_CUT to set the ÒxÓ coordinate to

0.283 ± 0.02.

Note: If the above adjustments cannot be done to

each coordinate, adjust G_CUT to increase or decrease the green cutoff and repeat procedures 3 and 4.

6-3-3 Video Gain Adjustment

Figure 6-8. Green Box Pattern

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó)

Display image: Green box pattern

within range for which the ABL circuit is not active (1/3 to 1/2H and

1/3 to 1/2V). Brightness: Maximum Contrast: Maximum

PROCEDURE

1. Adjust G-Gain so that the brightness of the

green gain is 40 ± 1 ft-L (typically 40 ft-L).

6-3-4 White Balance Adjustment

Figure 6-9. Full White Pattern

6 Alignment and Adjustments

CHA42*7L/5**7L 6-5

6-3 Color Adjustments

1/3H-1/2H

1/3V-1/2V

FRONT BEZEL OPENING BACK RASTER

GREEN WINDOW

FRONT BEZEL OPENING BACK RASTER

WHITE WINDOW

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: Full white pattern Brightness: Maximum Contrast: Maximum

PROCEDURE

1. Display the full white pattern.

2. Adjust R-Gain and B-Gain so that the video is

white. (x = 0.283 ± 0.02 and y = 0.298 ± 0.02)

6-3-5 White Balance Fine Adjustment

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: Full white pattern X-Y coordinates: x = 0.283 ± 0.02

y = 0.298 ± 0.02

PROCEDURE

1. Adjust the Contrast control so that the

brightness of the video is about 5 ft-L.

2. Check whether the white coordinates of the

video meet the specification above. If they do not, adjust them so that they do.

3. Adjust the Contrast to maximum luminance.

4. Check whether the white coordinates still

meet the specification above. If they do not, adjust them so that they do.

6-3-6 ABL Point Adjustment

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: Full white pattern Brightness: Maximum Contrast: Maximum

PROCEDURE

Adjust ABL so that the brightness level is 35 ± 1 ft-L.

6-3-7 Focus Adjustment

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: ÒHÓ character pattern Brightness: Maximum 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.

6-3-8 Luminance Uniformity Check

CONDITIONS

Measurement instrument: Color analyzer Scanning frequency: 53.7 kHz/85 Hz (15Ó)

43.3 kHz/85 Hz (14Ó) Display image: White flat field Brightness: Cut off point at 30 ft-L

PROCEDURE

Measure luminance at nine points on the display screen: top left corner, top center, top right corner, center row left side, center, center row right side, bottom left corner, bottom center, and bottom right corner.

6 Alignment and Adjustments

6-6 CHA42*7L/5**7L

+ 45 hidden pages