1 Precautio 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 4. When troubleshooting a monitor with excessively high voltage, avoid being 1.
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1 Precautions 1-1-3 Fire and Shock Hazard 3. Leakage Current Hot Check (Figure 1-1): WARNING: Do not use an isolation transformer Before returning the monitor to the user, perform during this test. the following safety checks: Use a leakage current tester or a metering system that complies with American National 1.
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 E PROM, high voltage step must be adjusted until high voltage becomes 24.5 kV.
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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.
2 Product Specifications 2-2 Pin Assignments Sync 15-Pin Signal Cable Connector (Figure 2-1) Type Separate Pin No. Green Blue DDC Return GND-R GND-G GND-B Reserved GND-Sync/Self-raster DDC Data H-Sync V-Sync DDC Clock Figure 2-1. Male Type 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 VESA 720/70 Hz 640/60 Hz 640/75 Hz 640/85 Hz 800/75 Hz 800/85 Hz 1024/60 Hz...
3 Operating Instructions 3-1 Front View and Controls 3-1-1 CKA4227L Front View Table 3-1. Front Panel Controls Location Symbol Description Power Button Power Indicator LED (Dual Color) Horizontal Position Button Vertical Position Button Horizontal Size Button Vertical Size Button Contrast Control Brightness Control Trapezoid Button Side Pincushion Button...
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3 Operating Instructions 3-1-2 CKA5227L Front View Table 3-2. Front Panel Controls Location Symbol Description Power Button Power Indicator LED (Dual Color) Horizontal Position Button Vertical Position Button Horizontal Size Button Vertical Size Button Contrast Control Brightness Control Trapezoid Button Side Pincushion Button Adjustment Buttons Parallelogram...
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3 Operating Instructions 3-1-3 CKA4217L Front View Table 3-3. Front Panel Controls Location Symbol Description Power Button Power Indicator LED (Dual Color) Horizontal Position Button Vertical Position Button Horizontal Size Button Vertical Size Button Contrast Control Brightness Control Trapezoid Button...
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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 Power saving function EPA/NUTEK State Normal Operation Stand-By Suspend Mode Power Off Mode...
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.
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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 4-2-3 Replacing the CRT Socket PCB 1. Loop the CRT Ground Ass’y around the back 1.
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.
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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.
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5 Alignment and Adjustments 5-1-3 Connecting the SoftJig Connect the monitor to the signal generator and/ MONITOR or PC as illustrated in Figures 5-1 and 5-2. INTERFACE BOARD VER. 2.0 Note: The signal cable connector which includes the 3-wire cable must connect to the 7 PIN MINI DIN monitor.
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5 Alignment and Adjustments 5-2 Display Control Adjustments 5-2-1 Centering 5-2-1 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS Centering means to position the center point of Scanning frequency: 53.7 kHz/85 Hz (15”) the display in the middle of the display area. 43.8 kHz/85 Hz (14”) Horizontal size and position and vertical size and Display image: Crosshatch pattern...
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5 Alignment and Adjustments | C1 |, | C2 | ≤ 1.5 mm, | D1 |, | D2 | ≤ 1.5 mm. 5-2-3 Trapezoid Adjustment CONDITIONS Scanning frequency: 53.7 kHz/85 Hz (15”) 43.8 kHz/85 Hz (14”) Display image: Crosshatch pattern Make the the test pattern rectangular.
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5 Alignment and Adjustments 5-2-8 Pin Balance Adjustments To activate the pin balacne function, push both the horizontal position and vertical position 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.
1. Signal Generator 2. Adjust VR102R (R-Bias) and VR102B (B-Bias) so Back Raster color is white. 2. Computer with Samsung DM 200 software or (x = 0.283 ± 0.02 and y = 0.298 ± 0.02) DisplayMate for Windows software from...
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5 Alignment and Adjustments PROCEDURE 5-3-7 Focus Adjustment 1. Display the full white pattern. CONDITIONS 2. Adjust VR101 (R-Gain) and VR103 (B-Gain) so Measurement instrument: Color analyzer that the video is white. Scanning frequency: 53.7 kHz/85 Hz (15”) (x = 0.283 ± 0.02 and y = 0.298 ± 0.02) 43.8 kHz/85 Hz (14”) Display image: “H”...
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5 Alignment and Adjustments 5-3-9 Color Purity Adjustment 3. Make sure the spacing between the PCM assembly and the CRT stem is Color purity is the absence of undesired color. 22.5 mm ± 1 mm. Conspicuous mislanding (unexpected color in a 4.
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5 Alignment and Adjustments 5-4 Convergence Adjustments Misconvergence occurs when one or more of the electron beams in a multibeam CRT fail to meet the other beams at a specified point. Table 5-4. Misconvergence Tolerances FRONT Position Error in mm CRT Dot Pitch Center (A) 0.30...
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5 Alignment and Adjustments 5-4-1 Static (Center) Convergence 5-4-2 Dynamic (Edge) Convergence Static convergence involves alignment of the red, CONDITIONS blue and green lines in the center area of the Direction: Monitor facing east display. Warm-up: 30 minutes See “Dynamic Convergence” for alignment of Display image: Crosshatch pattern color fields around the edges of the display.
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5 Alignment and Adjustments 5-4-3 Bow Convergence Adjustments 5-4-4 (a) HORIZONTAL LINE RED AND BLUE BALANCE CONVERGENCE CONDITIONS Orientation: Monitor facing east. BLUE Display Image: Crosshatch pattern with mixed RGB colors. Required tools: Philips (+) screwdriver, 1.5 mm Hexkey, 2.5 mm Figure 5-12.
6 Troubleshooting Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect. 2. Check the following circuits. • No raster appears: Power circuit, Horizontal output circuit, H/V control circuit, and H/V output circuit. •...
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6 Troubleshooting 6-3 No Raster WAVEFORMS Does the drive pulse appear Check the horizontal drive at Pin 26 of IC401? circuits. (IC401) 4.76 V (IC401, #26) Does the drive pulse appear at the collctor of Check Q403 and T401 Q403? CH1 P-P = 4.76 V CH1 RMS = 3.652 V 29.4 V (Q403, Collector)
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6 Troubleshooting 6-4 No Video WAVEFORMS 5.04 V (IC202, #37), Clamp Power indicator is green Does DC 12 V appear at Check IC604. Pins 16 and 5 of IC101? CH1 P-P = 5.04 V CH1 RMS = 5.024 V 4.92 V (IC101, #19) Does the video pulse Check signal cable appear at Pins 4, 6 and 8...
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6 Troubleshooting 6-5 No Specific Color Appears The raster color is The raster color is light green The raster color is light red or cyan or magenta light blue or yellow Check the video circuits Check the video circuits Check the video circuits (IC101, IC102 pin #1, and (IC101, IC102 pin #3, and (IC101, IC102 pin #5, and...
6 Troubleshooting 6-7 Power Save Management System Failure 6-7-1 Stand-By Mode 6-7-2 Suspend Mode 1. Check V-sync input (inactive) Does 0 V appear at Does +5 V appear at 2. Check IC202 and its related Pin 3 of IC202? Pin 12 of IC202? circuits Does 0 (zero) V appear at Check IC604 and Q602.
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6 Troubleshooting 6-8 User Controls Don’t Work Does the DC level change at Check the button Pins 29, 30, 31 and 32 of IC201 when (SW201~SW203, you push the front panel button? SW205~SW208 and SW211) Does the DC level change at the positive pole capacitors when you push the Check IC202.
11 Schematic Diagrams 11-1 Cautions 1. The areas marked with a on the schematic diagram designate components which have special characteristics important for safety. Replace these parts only with parts identical to those in the original circuit and those specified in the parts list. Before replacing any of these components, carefully read the ÒProduct Safety Notice.Ó...
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11 Schematic Diagrams 11-6 Video Part Schematic Diagram 11-4 CKA42*7L/5227L...
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11 Schematic Diagrams 240 V (IC602, Drain) 55.2 V (T601, #7) 8.44 V (IC602, #5) 4.52 V (CN201, #9) 4.52 V (CN201, #11) 0.714 V (CN201, R-Video) 5.00 V (IC202, #11) 1.7 V (IC202, #2) CH1 ∆ = 240 V CH1 ∆...
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11 Schematic Diagrams Table 11-1. IC101 (KA2141) Table 11-2. IC102 (LM2406) Table 11-3. IC201 (KIA7545) Table 11-4. IC202 (68HC705) MODES MODES MODES MODES MODES MODES 1024 x 768 / 60 Hz 640 x 480 / 60 Hz 1024 x 768 / 60 Hz 640 x 480 / 60 Hz 1024 x 768 / 60 Hz 640 x 480 / 60 Hz 1024 x 768 / 60 Hz 640 x 480 / 60 Hz...