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COLOR MONITOR
CHA4217L CHA4227L CHA5807L CHA5227L
SERVICE
COLOR MONITOR
Manual
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
1 Precautions
1-1 Safety Precautions
WARNINGS 1. For continued safety, do not attempt to modify the circuit board. 2. 3. Disconnect the AC power before servicing. When the chassis is operating, semiconductor heatsinks are potential shock hazards. 3. 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. 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). 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.
(READING SHOULD NOT BE ABOVE 0.5mA)
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. 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. 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. 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. 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. 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. Handle the CRT only when wearing shatterproof goggles and after completely discharging the high voltage anode. Do not lift the CRT by the neck.
4.
2.
3.
4.
DEVICE UNDER TEST TEST ALL EXPOSED METAL SURFACES
LEAKAGE CURRENT TESTER
5.
2-WIRE CORD
6.
ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)
EARTH GROUND
Figure 1-1. Leakage Current Test Circuit
7.
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.
8.
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.
CHA42*7L/5**7L
1-1
1 Precautions
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.
1. 2. Servicing precautions are printed on the cabinet, and should be followed closely. 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. 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. 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). 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. 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.
3.
4.
8.
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. 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. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of an electrostatic charge. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDs. Use only a grounded-tip soldering iron to solder or desolder ESDs. 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. 8. 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. 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. 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. Indicates ESDs on the Schematic Diagram in this manual.
7.
2.
3.
4. 5.
9.
1-2
CHA42*7L/5**7L
2 Reference Information
2-1 List of Abbreviations, Symbols and Acronyms
2-1-1 Abbreviations
Abbreviation ASS'Y B B+ ADJ B-CUT B-GAIN BRIGHT C C-MIC CLK CM CN CONT D-SUB EEP-CLK EXT EXT-MIC Freq. FU G G-CUT G-GAIN GND H H H-DRV H-DY H-FLB H-FV H-LIN H-POSI H-SIZE H/PHONE Hz I-SENSE lb MAX MIC MIN MP MPP MO CHA42*7L/5**7L Definition Assembly Blue B+ Adjustment Blue-Cutoff Blue Gain Brightness R-Composition Condenser Microphone Clock R-Cement Connector Contrast D-Subminiature Electrically Erasable and Programmable Clock External External Microphone Frequency Fusible Green Green-Cutoff Green Gain Ground Horizontal Heater Horizontal Drive Horizontal Deflection York Horizontal Flyback Horizontal-Feedback Voltage Horizontal Linearity Horizontal Position Horizontal Size Headphone Hertz Current-Sense Pound Maximum Microphone Minimum C-Metalized Polyester Metal Polypropylene R-Metal Oxide Abbreviation OSC P PARA PARALL PIN-BAL PRE-AMP PS1 PS2 PWR R R-CUT R-GAIN RST S-PIN S-RASTER S/W SCAP SPK SYNC T TR TRAP U-COM V V-DY V-FLB V-LIN V-MUTE V-OUT V-PARA V-POL V-POSI V-SENSE V-SIZE WW X-TAL K M uF nF pF Definition Oscillator C-Polyester Parabola Parallelogram Pincushion Balance Pre-Amplifier Power Saving1 (suspend) Power Saving2 (off) Power Red Red-Cutoff Red Gain Reset Side Pincushion Self Raster Switch S Correction Capacitor Speaker Synchronization C-Tantalum Transistor Trapezoid Microprocessor Vertical Vertical Deflection York Vertical Flyback Vertical Linearity Video Mute Vertical Output Vertical Parabola V-Polarity Vertical Position Voltage-Sense Vertical Size R-Wire Wound Crystal ohm 1000 ohm 1000 K microfarad (10-6F) nanofarad (10-9F) picofarad (10-12F) 2-1
2 Reference Information
2-1-2 Symbols
Can emit X-radiation Hot Ground Cold Ground Electrostatically Sensitive Device (ESD)
!
Provides special safety considerations
2-1-2 Acronyms
Acronym ABL AC ACL AFC ANSI CMOS CRT DC DDC DF DMM DPMS DVM DY EEPROM ESD ESF FBT FET FH FS FV GD Definition Automatic Brightness Limits Alternating Current Automatic Contrast Limit Automatic Frequency Control American National Standards Institute Complementary Metal Oxide Semiconductor Cathode Ray Tube Direct Current Data Display Channel Dynamic Focus Digital Multimeter Display Power Management Signaling Digital Voltmeter Deflection York Electrically Erasable and Programmable Read only Memory Electrostatically Sensitive Device Electronic Static Field Flyback Transformer Field Effect Transistor Horizontal Frequency Fail Safe Vertical Frequency Geometric Distortion VGA VR W/B Acronym H/V HV I/O IC LED MAC MOFA OCP OP AMP OSD P-P PCB PLL PWM SMPS SVGA SWEDAC TP UL USB VESA Test Point Underwriters Laboratories Universal Serial Bus Video Electronics Standard Association Video Graphics Array Variable Registor White Balance Definition Horizontal/Vertical High Voltage Input/Output Integrated Circuit Light Emitting Diode Macintosh Mask Outside Frame Assemble Over Current Protection Operational Amplifier On Screen Display Peak to Peak Printed Circuit Board Phase Locked Loop Pulse Width Modulation Switch Mode Power Supply Super Video Graphics Array
2-2
CHA42*7L/5**7L
3 Product Specifications
3-1 Specifications
Item Picture Tube: Description 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 Horizontal: 30 kHz to 55 kHz (Automatic) - 14" / 30 kHz to 61 kHz (Automatic) - 15" Vertical: 50 Hz to 125 Hz (Automatic) Unlimited colors Horizontal : 1024 Dots Vertical : 768 Lines Analog, 0.714 Vp-p positive at 75 , internally terminated Separate Sync : TTL level positive/negative 14" : 65 MHz, 15" : 85 MHz 14" 255 mm ± 3 mm (4:3 ratio) 191 mm ± 3 mm AC 90 to 264 Volts, 60 Hz/50 Hz ± 3 Hz 73 Watt 14" 15" 15" 267 mm ± 3 mm (4:3 ratio) 200 mm ± 3 mm
Scanning Frequency
Display Colors Maximum Resolution
Input Video Signal Input Sync Signal Maximum Pixel Clock Active Display Horizontal Vertical Input Voltage Power Consumption Dimensions Unit (W x D x H) Carton (W x D x H) Weight (Net/Gross)
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) 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) 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) Operating Temperature : Storage Temperature : 32°F to 104°F (0°C to 40°C) Humidity : 10 % to 80 % -4°F to 113°F (-20°C to 45°C) Humidity : 5 % to 95 %
Environmental Considerations
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.
CHA42*7L/5**7L
3-1
3 Product Specifications
3-2 Pin Assignments
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Sync 15-Pin Signal Cable Connector (Figure 3-1) Type Separate 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
5
15
Figure 3-1. Male Type
3-2
CHA42*7L/5**7L
3 Product Specifications
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. Table 3-1. Timing Chart Mode IBM 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 28.322 640/60 Hz 640 x 480 31.469 31.778 3.813 1.907 25.422 0.636 59.940 16.683 0.064 1.048 15.253 0.318 25.175 640/75 Hz 640 x 480 37.500 26.667 2.032 3.810 20.317 0.508 75.000 13.333 0.080 0.427 12.800 0.027 31.500 640/85 Hz 640 x 480 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 VESA 800/75 Hz 800 x 600 46.875 21.333 1.616 3.232 16.162 0.323 75.000 13.333 0.064 0.448 12.800 0.021 49.500 800/85 Hz 800 x 600 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 1024/60 Hz 1024 x 768 (14") 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 1024/75 Hz 1024 x 768 (15") 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
Timing 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
Negative Positive Separate
Negative Negative Separate
Negative Negative Separate
Negative Negative Separate
Positive Positive Separate
Positive Positive Separate
Negative Negative Separate
Positive Positive Separate
Separate Sync
Horizontal
Video Video
CC
H/V Composite Sync
A Q Vertical P
RR S S
VIDEO R
S
Vertical
Video Video
Horizontal B
O
DD
E E
Q
Q
Sync Sync
B B AA
Sync Sync PP
O O
A : Line time total C : Back porch E : Front porch CHA42*7L/5**7L
B : Horizontal sync width D : Active time
O : Frame time total Q : Back porch S : Front porch
P : Vertical sync width R : Active time
3-3
3 Product Specifications
Memo
3-4
CHA42*7L/5**7L
4 Operating Instructions
4-1 Front View and Control
Table 4-1. Front Panel Controls
Location 1 2 3 4 5 6 7
1 2
Symbol
Description Power Button Power Indicator LED Horizontal Position Button Vertical Position Button Horizontal Size Button Vertical Size Button Adjustment Buttons Side Pincushion Button Trapezoid Button Brightness Control Contrast Control
8 9
14 13 12
17 16 15
10 11 12 13 14 15
+ + + + + + + +
Parallelogram V-Linearity Pinbalance Button Degauss Recall User Delete Tilt (Option: 15") V-Moire
3
4 18
5 19
6
7
8
9
10
11
16 17 18 19
Figure 4-1. Front Control Panel
CHA42*7L/5**7L
4-1
4 Operating Instructions 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. Table 4-2. Display Power Management Signaling (DPMS)
State Items Horizontal Sync Vertical Sync Video Power Indicator
Normal Operation Power saving function EPA/NUTEK
Stand-By Mode Suspend Mode Power Off Mode Position A Position B
Active Active Active Green
Inactive Active
Active Inactive
Inactive Inactive
Blanked Blanked Blanked Green Green Green Blinking (0.5 Blinking (0.5 Blinking (1 sec sec interval) sec interval) interval) 50 W (nominal) Less than 15 W Less than 5W
73 W (max.) Power 60 W Consumption/hr (nominal)
4-2
CHA42*7L/5**7L
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.
5-1-1 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.
5-1-3 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.
5-1-2 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.
5-1-4 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
Memo
5-2
CHA42*7L/5**7L
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.
6-1-1
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
6-1-2
Required Equipment
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR PARALLEL CABLE PC SIGNAL GENERATOR SIGNAL CABLE
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
7 PIN MINI DIN CONNECTOR
Figure 6-1. Setup 1, With Signal Generator
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR PARALLEL CABLE PC 7 PIN MINI DIN CONNECTOR SIGNAL CABLE D-SUB CONNECTOR
Figure 6-2. Setup 2, Without 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.
6-1-3 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.
6-2
CHA42*7L/5**7L
6 Alignment and Adjustments
6-2 Display Control Adjustments
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.
C DISPLAY AREA A B EDGE OF BEZEL D
6-2-1 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) Crosshatch pattern Maximum 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: Display image: 53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) Crosshatch pattern
PROCEDURE Center the test pattern on the raster. 6-2-1 (d) VERTICAL POSITION ADJUSTMENT CONDITIONS Scanning frequency: Display image: 53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) Crosshatch pattern
Figure 6-3. Centering 6-2-1 (a) HORIZONTAL MINIMUM SIZE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) Crosshatch pattern Maximum Maximum
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 (%)
= 2 x (Max Min) Max + Min x 100
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.
Table 6-1. Standard Modes Linearity: 800 x 600/85Hz - 15" 640 x 480/85 Hz - 14"
Standard Timing Modes Each block (10 %) Difference between adjacent blocks (4 %)
Table 6-2. Other Modes Linearity: VGA, SVGA, XGA, MAC, etc.
Supported Timing Mode Each block (14 %) Difference between adjacent blocks (5 %)
CHA42*7L/5**7L
6-3
6 Alignment and Adjustments
6-2-3 Trapezoid Adjustment
CONDITIONS Scanning frequency: Display image:
2.2 mm
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.
A B C D
53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) Crosshatch pattern
Make the the test pattern rectangular.
2.2 mm
FRONT BEZEL BACK RASTER
Figure 6-7. CRT Tilt Adjustment
2.2 mm 2.2 mm
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.
Figure 6-4. Trapezoid
6-2-4 Parallelogram Adjustment
CONDITIONS Scanning frequency: Display image: 53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) 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.
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
2.2 mm
Figure 6-5. Parallelogram
6-2-5 Side Pincushion Adjustment
CONDITIONS Scanning frequency: Display image: 53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) Crosshatch pattern
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.
After pushing the Side Pincushion button once, push the Increase (+) and Decrease (Ð) buttons to straighten the sides of the test pattern.
| C1 |, | C2 | 2.0 mm, | D1 |, | D2 | 2.2 mm. C2
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.
D1
D2
C1
Figure 6-6. Pincushion 6-4 CHA42*7L/5**7L
6 Alignment and Adjustments
6-3 Color Adjustments
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. 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
1/3H-1/2H FRONT BEZEL OPENING 1/3V-1/2V BACK RASTER GREEN WINDOW
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 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
FRONT BEZEL OPENING
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 CHA42*7L/5**7L
BACK RASTER WHITE WINDOW
Figure 6-9. Full White Pattern
6-5
6 Alignment and Adjustments 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)
6-3-7 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.
6-3-5 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.
6-3-8 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.
6-3-6 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.
6-6
CHA42*7L/5**7L
6 Alignment and Adjustments
6-3-9 Color Purity Adjustment
Color purity is the absence of undesired color. Conspicuous mislanding (unexpected color in a uniform field) within the display area shall not be visible at a distance of 50 cm from the CRT surface. CONDITIONS Orientation: Monitor facing east Scanning frequency: 53.7 kHz/85 Hz (15Ó) 43.3 kHz/85 Hz (14Ó) Display image: White flat field Luminance: Cutoff point at the center of the display area Caution: Color purity adjustments should only be attempted by qualified personnel. PROCEDURE For trained and experienced service technicians only. Use the following procedure to correct minor color purity problems: 1. Make sure the display is not affected by external magnetic fields. Use an external degaussing coil to neutralize magnetic fields which may be affecting color purity. 2. Very carefully break the glue seal between the 2-pole purity convergence magnets (PCM), the band and the spacer (see Figure 6-9).
3. Make sure the spacing between the PCM assembly and the CRT stem is 22.5 mm ± 1 mm. 4. Display a red pattern over the entire display area. 5. Adjust the Purity Magnet Rings on the PCM assembly to display a pure green pattern. (Optimal setting: x = x = 0.310 ± 0.015, y = 0.592 ± 0.015) 6. Repeat steps 4 and 5 using a red pattern and then again, using a blue pattern. Table 6-3. Color Purity Tolerances Red: Green: Blue: x = 0.625 ± 0.015 x = 0.310 ± 0.015 x = 0.150 ± 0.015 y = 0.340 ± 0.015 y = 0.592 ± 0.015 y = 0.063 ± 0.015
(For 9300K white color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02) 7. When you have the PCMs properly adjusted, carefully gule them together with Locktite to prevent their movement during shipping.
CHA42*7L/5**7L
6-7
6 Alignment and Adjustments
6-4 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 6-4. Misconvergence Tolerances Position Center (A) Edge (B) Error in mm 0.30 0.40 CRT Dot Pitch 0.28 0.28
10 2 3 4 5 6 7 8 9 1 11
CRT FRONT
B 200 MM A
Toshiba CRT
1 Setup Bolt 2 Bow Magnet 6 6-Pole Magnet 10 Band 3 Spacer 7 Spacer 11 Tabs 4 2-Pole Magnet 8 4-Pole Magnet 5 Band 9 Holder
267 MM
Figure 6-10. Convergence Measurement Areas Figure 6-11. Magnet Configuration
Figure 6-12. Magnet Movements Red and Blue Alignment (4-pole magnet movement)
O-Magnetic Field
Red, Blue and Green Alignment (6-pole magnet movement)
RB
(1) SPREAD
VERTICAL MISALIGNMENT
M
G G RB
TAB MAGNET
B R
HORIZONTAL MISALIGNMENT
OR
Motion (1)
R B B R
SHIFT DIRECTION OF CROSSHATCH PATTERN
M
G G RB
Motion (2)
R B B R
SHIFT DIRECTION OF CROSSHATCH PATTERN
M G M
G
MOVE TOGETHER
6-8
CHA42*7L/5**7L
6 Alignment and Adjustments
6-4-1 Static (Center) Convergence
Static convergence involves alignment of the red, blue and green lines in the center area of the display. See ÒDynamic ConvergenceÓ for alignment of color fields around the edges of the display. CONDITIONS Direction: Warm-up: Display image: Tolerances:
6-4-2 Dynamic (Edge) Convergence
CONDITIONS Direction: Warm-up: Display image: Tolerances: Monitor facing east 30 minutes Crosshatch pattern See Table 6-5
Monitor facing east 30 minutes Crosshatch pattern See Table 6-5
PROCEDURE As shown in Figure 6-11, the CRT used in this monitor has the magnet configuration as shown in Table 6-6. Table 6-5. Magnet Configurations CRT Manufacturer Toshiba Magnet Order from Front of CRT Convergence bow, 2-pole, 6-pole, 4-pole
PROCEDURE Use the following procedure to correct minor dynamic (edge) misconvergence. If, after using this procedure, dynamic misconvergence is still greater than the tolerance around the periphery of the display area, contact the Regional After Service Center for possible CRT replacement. 1. Make sure the display is not affected by external magnetic fields. 2. Make sure the static convergence is properly adjusted. 3. Strategically place small magnet rubbers on the back of the CRT to correct the misconvergence. Be careful not to remove the paper protecting the adhesive on the magnet rubbers until you are satisfied with their placement and the dynamic convergence. 4. When you are satisfied with the convergence around the edge of the CRT, permanently glue the magnet rubbers to the back of the CRT. WARNING: Do not remove or change the position of the factory installed wedges. These wedges were installed by the CRT manufacturer and are properly placed for this CRT; their removal may result in damage to the CRT.
Use the following steps to correct any static misconvergence: 1. Locate the pair of 4-pole magnet rings. 2. Unlock the rings and rotate the individual rings (change the spacing between tabs) to converge the vertical red and blue lines. 3. Rotate the pair of rings (maintaining spacing between tabs) to converge the horizontal red and blue lines. 4. After completing the red and blue center convergence adjustment, locate the pair of 6pole magnet rings. 5. Rotate the individual rings (change the spacing between tabs) to converge the vertical red and blue (magenta) and green lines. 6. Rotate the pair of rings (maintaining the spacing between tabs) to converge the horizontal red and blue (magenta) and green lines. DonÕt rotate the 2-pole magnets as they adjust for color purity. 7. Mark the correct position for the magnets and apply a small line of glue to hold the magnets in place. Lock the rings in place.
!
CHA42*7L/5**7L
6-9
6 Alignment and Adjustments
6-4-3 Bow Convergence Adjustments
CONDITIONS Orientation: Monitor facing east. Display Image: Crosshatch pattern with mixed RGB colors. Required tools: Philips (+) screwdriver, 1.5 mm Hexkey, 2.5 mm PROCEDURE Bow convergence adjustments are not available for the CRTs used in the CHA42*7L/5**7L monitors. While all CRTs have bow convergence magnets, they are sealed in the CRT factory and are not user or service technician adjustable. Do not touch these magnets (see Figure 6-11). If bow convergence adjustment is out of alignment, replace the CRT. Bow misconvergence should not exceed the values listed in Table 6-5: Misconvergence Tolerances.
6-4-4 (a) HORIZONTAL LINE RED AND BLUE BALANCE CONVERGENCE
BLUE RED
Figure 6-14. Horizontal Line Balance Misconvergence PROCEDURE Use a 2.5 mm hexkey at the Horizontal Balance Coil (Xv). Turning it right raises the right end of the blue line and lowers the left end. Turning the VR to the left lowers the right end of the blue line and raises the left end. 6-4-4 (b) VERTICAL RED AND BLUE BALANCE CONVERGENCE
BLUE RED
6-4-4 Balance Convergence Adjustments
Balance Convergence involves alignment of red and blue lines when they are misaligned at one end more so than at the other end. The Deflection Yoke holds the balance coils which can correct balance misconvergences.
Figure 6-15. Vertical Line Balance Misconvergence PROCEDURE Use a 1.5 mm phillips (+) screwdriver at the YH variable resistor. Turning the VR to the left tilts the blue line to the right. Turning it right tilts the blue line to the left. 6-4-4 (c) UPPER AND LOWER HORIZONTAL LINE CONVERGENCE
RED BLUE
Xv
Yh
Yv
XV
RED BLUE
YH YV
Figure 6-16. Upper and Lower Balance Misconvergence PROCEDURE Use a 1.5 mm phillips (+) screwdriver at theYv variable resistor. Turning the VR to the left moves the blue line at the top upward and at the bottom, the line moves downward. Turning it right moves the blue line at the top downward and at the bottom the line moves upward.
Figure 6-13. Deflection Yoke Caps
6-10
CHA42*7L/5**7L
7 Troubleshooting
7-1 General 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. · High voltage develops but no raster appears: Video output circuits. · High voltage does not develop: Horizontal output circuits.
7-1-1 No Picture
Check signal cable connection, H/V Sync input. Check Timing mode (14": 30~55kHz, 15": 30~61kHz). Check Cont, Brit key (all Max) and Screen VR (G2).
Check key components of secondary part. : Q402, Q508, D515, D403, D408, D409, Q410, Rectifier diodes (D615, D611, D608, D616, D617), IC101 (Vcc~GND)
Check key components of primary part. : FH601, TH602, D604 ~ D607, IC602, OP601
Refer to 7-2-16 No Video.
Check SW211 (Power key) : Does IC202's #2 voltage vary vary from 5V to 0V, when pressing SW211?
Refer to 7-2-1 No Power.
Refer to 7-2-3 No Raster and 7-2-12 High Voltage Failure.
Refer to 7-2-17 Micom Failure.
Refer to 7-2-13 I2C Failure.
CHA42*7L/5**7L
7-1
7 Troubleshooting
7-1-2 Shut Down
Check X-ray protection circuit. : D519, D505, R506, R503, D503
Check key components of secondary part. : Q402, Q508, D408, D403, D409, Q410, Rectifier diodes (D615, D611, D608, D616, D617), IC101 (Vcc ~ GND)
Check and replace IC602, OP601.
Refer to 7-2-1 No Power.
Refer to 7-2-3 No Raster and 7-2-12 High Voltage Failure.
Refer to 7-2-17 Micom Failure.
Refer to 7-2-13 I2C Failure.
7-2
CHA42*7L/5**7L
7 Troubleshooting
7-1-3 No Video or Missing Colors
Check signal cable connection, H/V Sync input. Check Timing mode (14": 30~55kHz, 15": 30~61kHz). Check Cont, Brit key (all Max) and Screen VR (G2).
WAVEFORMS
19 46.4 V (SK103, G)
22
Are 0.7Vp-p video input on CN201 R, G, B? Yes
No
Check signal cable and generator.
CH1 P-P = 46.4 V CH1 RMS = 38.16 V
22 1.016 V (CN202_2, #3)
19
Are proper waveform on SK103's R, G, B cathode? Yes
No
Refer to 7-2-16 No Video.
CH1 P-P = 1.016 V
CH1 RMS = 174.4 mV
Is G2 and heater voltage OK?
No
Check and replace SK103 and some parts around it.
Yes Change CRT and replace it.
7-1-4 Visible Retrace
Check white balance adjustment.
WAVEFORMS
17 35.2 V (SK103, G1)
Is G2 voltage (Screen VR) OK?
No
Adjust Screen VR to 0.4~0.6F/L (back raster) at cont, bright all max.
CH1 P-P = 35.2 V CH1 RMS = 80.84 V
Yes
25
25 4.96 V (IC202, #30)
Is V_sync input on Q301 base?
No
Check V_sync input line.
Yes
17
Is proper G1 pulse on SK103's G1 pin? Yes Check and replace CRT.
No
Check Q301, C304, C301, D510, Q504 and around parts.
CH1 P-P = 4.96 V
CH1 RMS = 350 mV
CHA42*7L/5**7L
7-3
7 Troubleshooting
7-1-5 Unsynchronized image
Check the connection of signal cable.
24
Are H/V sync input on IC202's Pins 29 and 30? 25 Yes
No
Check H/V sync input line.
No
Refer to 7-2-17 Micom Failure.
26
Are H/V sync input on IC401's Pins 1 and 2? 27 Yes
No
Check H/V sync input line.
No
Check and replace IC202.
WAVEFORMS
24 5.28 V (IC202, #30) 25 4.96 V (IC202, #30)
Refer to 7-2-12 High Voltage Failure. Yes Check and replace IC401.
CH1 P-P = 5.28 V
CH1 RMS = 1.218 V
CH1 P-P = 4.96 V
CH1 RMS = 350 mV
26 5.48 V (IC401, #1)
27 4.48 V (IC401, #2)
CH1 P-P = 5.48 V
CH1 RMS = 1.362 V
CH1 P-P = 4.48 V
CH1 RMS = 284 mV
7-1-6 Misconvergence
Readjust Misconvergence.
Spec in? (Center : 0.3 mm, Cornor : 0.4 mm) Yes Done
No
Change CRT and readjust Miconvergence and color.
7-4
CHA42*7L/5**7L
7 Troubleshooting
7-1-7 Poor Focus
Adjust Focus VR.
Improved Focus?
Yes
Aging monitor and check focus change for 1~2 hours.
No Check Focus lead from FBT to CRT Socket. Yes Are the CRT Socket and connection OK? Yes Check and replace CRT. No Replace and connect it.
7-1-8 Purity Failure
Degaussing
Is purity OK?
Yes
Done
No IS degaussing circuit OK? No Refer to 7-2-19 Degaussing Failure.
Yes Check if there is strong electric or magnetic fields near user's circumstance? No Change CRT and readjust misconvergence and color. Yes Recommend free electric or magnetic field.
CHA42*7L/5**7L
7-5
7 Troubleshooting
7-2 Detail Repair Section
Notes: 1. If a picture does not appear check first · if AC power cord is plugged or not, · if signal cable is connected or not, · if signal generator (PC) is operated well or not (DPMS mode) · if the Timing mode is out of spec or not (14": 30~55 kHz, 15": 30~61 kHz)
7-2-1 No Power
Check and replace Q402, Q508, D403, D408, D409, IC101, Q410
Does recitfied voltages of secondary part appear on C617, C620, C627, C632? No Are D608, D611, D620, D615, D616 and D617 OK? Yes Does rectified voltage (1.4 x AC input) of primary part appear on C617? Yes
1
Yes
Refer to 7-2-3 No Raster and 7-2-12 High Voltage Failure.
No
Replace it.
No
Check and replace FH601, TH602, D604~D607.
No
Desolder IC602's Pin 1. Yes
Is IC602's Pin 1 OK?
No
Does rectified voltage (1.4 x AC input) of primary part appear on C617? Yes No
Yes
2
Is IC602's Pin 5 OK?
No
Check and replace IC602, T601. Check and replace T601 and around parts.
Yes Check and Replace OP601, IC601, T602. Check and replace IC602, D614, R616, D619, D618, OP601, IC601, T602.
WAVEFORMS
1 410 V (IC602, #1) 2 8.40 V (IC602, #5)
CH1 P-P = 410 V
CH1 RMS = 332.8 V
CH1 P-P = 8.40 V
CH1 RMS = 4.680 V
7-6
CHA42*7L/5**7L
7 Troubleshooting
7-2-2 DPMS Failure
7-2-2 (a) Off Mode (No H/V sync) Make sure that there is No H/V sync from signal generator. (Signal cable should be connected)
Is LED blinking? (1 sec toggle)
Yes
Is OP201 OK?
Yes
Check and replace OP201, Q201.
No
No Check and replace IC202.
Are there 5V on IC202's Pin 7 (sus) and 0V on IC202's Pin 8 (off)? Yes +12 V Off?
No
Check and replace IC202.
No
Check and replace Q602, Q605, Q606.
Yes +6.3 V line Off? No Check and replace Q603, Q604.
Yes Done
CHA42*7L/5**7L
7-7
7 Troubleshooting 7-2-2 (b) Suspend Mode (H sync: OK, V sync: No) Make sure that H sync is OK and V sync is not. (Signal cable should be connected)
Is LED blinking? (0.5 sec toggle) No
Yes
Is OP201 OK? No Check and replace IC202.
Yes
Check and replace OP201, Q201.
Are there 5V on IC202's Pin 7 (sus) and 5V on IC202's Pin 8 (off)? Yes +12 V Off? Yes Done
No
Check and replace IC202.
No
Check and replace Q602, Q605, Q606.
7-2-2 (c) Stand-by Mode (H sync: No, V sync: OK) Make sure that H sync is not and V sync is OK. (Signal cable should be connected)
Is LED blinking? (0.5 sec toggle) No
Yes
Is OP201 OK? No Check and replace IC202.
Yes
Check and replace OP201, Q201.
Are there 0V on IC202's Pin 7 (sus) and 5V on IC202's Pin 8 (off)? Yes Is high voltage On? Yes Video Mute? Yes Done 7-8
No
Check and replace IC202.
No
Refer to 7-2-3 No Raster and 7-2-12 High Voltage Failure.
No
Refer to 7-2-16 No Video and 7-2-13 I2C Failure.
CHA42*7L/5**7L
7 Troubleshooting
7-2-3 No Raster : No Raster means (Power: OK, High Voltage: No)
Is 56 V on C517? No
Refer to 7-2-1 No Power.
Yes Is 12 V on C629? Yes Is 0 V on IC202's Pin 7 (sus)? Yes Check and replace Q605, Q602, Q606, IC101, IC401.
No
No Are H/V sync on IC202's Pins 29 and 30? No Check signal cable and pattern. Yes Check and replace IC202.
3
Does oscillation waveform appear on IC401's Pin 6? Yes
No
Check and replace C409, IC401, R406.
WAVEFORMS
3 5.12 V (IC401, #6)
4
Does horizontal output waveform appear on IC401's Pin 26? Yes Is Q402 OK?
No
Check and replace Q403, T401, Q402, T501, Q508.
CH1 P-P = 5.12 V CH1 RMS = 4.256 V
4 4.60 V (IC401, #26)
No
Replace it.
Yes
CH1 P-P = 4.60 V CH1 RMS = 3.054 V
Is Q508 OK?
No
Replace it.
Yes Check and replace D409, D408, D403, D515.
Operating? Yes Check and replace IC401, Q403, T401, D503, D505, D519, C440, C407, D216, Q203, T501, CRT. CHA42*7L/5**7L 7-9
7 Troubleshooting
7-2-4 S-correction Failure
Symptoms: Poor Horizontal linearity Corner: wide, Center: narrow or Corner: narrow, Center: wide Are S1 and S2 OK at IC202's Pins 14 and 15? Yes No No
Are Q406 and Q407 OK?
Replace Q406, Q407.
Yes Check and replace IC202. No
Are Q404 and Q405 OK?
Replace it.
Yes Check and replace Q406, Q407, D406, D407, C422, C423, C424. Table 7-1. 31 ~ 36 S1 S2 0V 0V 36 ~ 41 0V 5V 41 ~ 50 5V 0V 50 ~ 61 5V 5V
* As CRT vendor and inch, there are differential items like L401, C422, C423, C424, R426, R212. If you want to change a PCB board to another one that is for different CRT and inch, you have to change differential items at schematic diagram.
7-2-5 H-Linearity Failure
Are code nomber and polarity of L402 right? Yes Are D401, C410, R416 OK? No Check and replace it. No
Check and replace it.
Yes Refer to 7-2-4 S-correction Failure.
7-10
CHA42*7L/5**7L
7 Troubleshooting
7-2-6 Invariable H_Size
Are Q410 and D408 OK? No
Replace it.
Yes Does the PWM duty of IC202's Pin 18 vary, pressing H_Size button? No Yes Is Q409 OK? No Check and replace Q409.
No Replace IC202.
WAVEFORMS
8
Is paravola waveform on IC401's Pin 24? Yes
No
Replace IC401.
8 1.12 V (IC401, #24)
Check and replace Q408, Q409, L402.
CH1 P-P = 1.12 V CH1 RMS = 3.094 V
7-2-7 Abnormal H_Size
Check if R444 and R434 are right as CRT differential items?
Does PWM duty of IC202's Pin 22 vary with different timings? (Low freq. : narrow duty High freq. : wide duty) Yes Does the FBT B+ voltage on T501's Pin 2 vary with different timings? Yes Adjust horizontal minium size with softjig. (Refer to 6-2-1)
No
Check and replace IC202 and some parts around it.
No
Refer to 7-2-12 High Voltage Failure.
CHA42*7L/5**7L
7-11
7 Troubleshooting
7-2-8 S_Pin, Trap, Para, V_Lin, Pin_Bal Failure
Key check (7-2-19)
WAVEFORMS
8 1.12 V (IC401, #24)
8
Is IC401's Pin 24 OK?
No
Check and replace IC401.
Yes
CH1 P-P = 1.12 V CH1 RMS = 3.094 V
Refer to 7-2-13 I2C Failure.
7-2-9 Tilt Failure
Check tilt connector. (CN303)
Key check (7-2-19)
Does the PWM duty of IC202's Pin 17 vary, pressing tilt and + or key? No Does the output voltage of IC302's Pin 1 vary, pressing tilt and + or key? Yes Check and replace CRT.
No
Check and replace IC302, IC202.
No
Check and replace IC302, +13 V and 12 V line.
7-12
CHA42*7L/5**7L
7 Troubleshooting
7-2-10 Vertical Deflection Failure
Symptoms: One horizontal line Rainbow color, No Video No
Are +13 V, 12 V line OK?
Check and replace D616, D608, IC301, IC302.
Yes
9
Is V_out waveform on IC401's Pin 23? Yes
No
Is 8 V on IC401's Pin 21?
No
Check and replace R314, R315, IC401.
Yes Check and replace IC401.
10
Is V_deflection waveform on IC301's Pin 5? Yes Refer to 7-2-13 I2C Failure.
No
Check and replace IC301, R312, R310, and some parts around it.
WAVEFORMS
9 3.16 V (IC401, #23) 10 50.8 V (IC301, #5)
CH1 P-P = 3.16 V
CH1 RMS = 3.686 V
CH1 P-P = 50.8 V
CH1 RMS = 7.04 V
7-2-11 Invariable V_Size or V_Position WAVEFORMS
9 3.16 V (IC401, #23)
Key check (7-2-18)
9
Does V_Out (IC401's Pin 23) vary, pressing V_Size or V_Posi key? No Refer to 7-2-13 I2C Failure.
Yes
Check and replace IC301 and some parts around it.
CH1 P-P = 3.16 V CH1 RMS = 3.686 V
CHA42*7L/5**7L
7-13
7 Troubleshooting
7-2-12 High Voltage Failure
Symptoms 1: No Power No Raster Unstable operation (Fixed FBT B+ voltage with different H_frequency, Over 31 kHz: whistle sound, Narrow H_Size, Unsynchronized image, 31 kHz: OK) No
Is 56 V on C617?
Refer to 7-2-1 No Power.
Yes
13
Is Q508's drain waveform ok?
No
Are Q508, D515, L501 ok? Yes
11
No
Check and replace it.
Yes
Are Q402, D409, D408, D403 and Q410 ok? Yes
No
Check and replace it.
Check and replace AFC input line from T501 to IC401's Pin 12. : D412, D413, C441, R401. Does the PWM duty of IC202's Pin 16 vary with different H_freq.? Yes Are D503, D505, D519, R508, R506, R530, Q203, D216 and D415 ok? Yes Does B_Out duty of IC401's Pin 28 vary with different H_frequency and image load (Full White or No Video)? Yes Check and replace Q507, Q509, IC401, T501. No Check and replace IC401, Q507, Q509, T501 and REG_IN line to IC401's Pin 15. No Check and replace it. No Check and replace IC202, Q203, D216.
12
WAVEFORMS
11 12 14.0 V (IC401, #28) 13 136 V (Q508, Drain)
CH1 P-P = 5.12 V
CH1 RMS = 4.256 V
CH1 P-P = 14.0 V
CH1 RMS = 7.34 V
CH1 P-P = 136 V
CH1 RMS = 78.3 V
7-14
CHA42*7L/5**7L
7 Troubleshooting Symptoms 2: X-ray protection One vertical line and then high voltage shut down. No
Are D505, C502, R506, R503 and C445 ok? Yes Check and replace Q402, Q508, D409, D408, D403, IC401.
Check and replace it.
Check and replace Q203, IC202.
7-2-13 I2C Failure
Almost data (Horizontal drive duty, FBT B+ duty, display image data, color data) is transferred from IC203 to IC101 and IC401 through I2C data line during power on. After user adjusts display image data, contrast and brightness data, these are saved to IC203.
Key check (7-2-18)
WAVEFORMS
14 5.92 V (IC203, #5, 6)
Is 5 V on IC401's Pin 32 and IC203's Pin 8? Yes
14
No
Check and replace it.
CH1 P-P = 5.92 V CH1 RMS = 3.812 V
Is there data communication on IC401's Pins 30 and 31? Yes Is there data communication on IC401's Pins 30 and 31 during I2C function? (H/V Posi, V_Size, S_Pin, Trap, Cont, Brit) Yes Done
No
CH1 : IC401's Pin 31 CH2 : IC401's Pin 30
No
14
Check I2C data and clock line.
Check and replace I2C devices. (IC101, IC401, IC203)
CHA42*7L/5**7L
7-15
7 Troubleshooting
7-2-14 ABL Failure
Symptoms : Full white luminance is too bright. (ABL minium is over 35 F/L) Full white luminance is too dark. (ABL maximum is under 35 F/L) The luminance of full white and No Video are almost same.
Display the full white pattern.
Check connections between CN202 and CN202_2.
No
Does full white luminance vary, adjusting ABL step with Softjig? Yes
Yes
Are full white and white square luminance almost same? No
Does the PWM duty of IC202's Pin 21 vary adjusting ABL step? No Check and replace IC202 and around parts.
Yes
No
Is R121 right as CRT's differential items? Yes
Replace R121 to higher or lower one that meets the spec.
Replace it.
Does the voltage of IC101's Pin 8 vary between full white and No Video?
F/W: 4.1~4.3V No Video: 5.3~6.0V
Yes
Check and replace IC101.
No Yes
Does T501's Pin 8 voltage vary between full white and No Video?
F/W: 1.5~3.0V No Video: 5.5~7.0V
Check and replace D518, IC101.
No No
Are 12 V line, R504, L504, Q501 and Q518 ok? Yes Are C509, D514, Q502 and Q506 ok? Yes Check and replace T501 and CRT.
Replace it.
No
Replace it.
7-16
CHA42*7L/5**7L
7 Troubleshooting
7-2-15 Invariable Contrast, Brightness Control
Refer to 7-2-18 Key Check. (Contrast, Brightness)
WAVEFORMS
15 3.16 V (IC101, #21)
I2C check (7-2-13) Yes
15
CH1 P-P = 3.16 V CH1 RMS = 1.008 V
Does IC101's output (Pins 18, 21 and 23) vary, pressing cont, brit key? Yes
No
16 43.2 V (IC102, #3)
Replace IC101.
16
Does IC102's output (Pins 1, 3 and 5) vary, pressing cont, brit key? Yes
No
Replace IC102.
CH1 P-P = 43.2 V
CH1 RMS = 63.56 V
Check and replace Q101R, Q101G, Q101B, Q102R, Q102G, Q102B, Q103R, Q103G, Q103B.
CHA42*7L/5**7L
7-17
7 Troubleshooting
7-2-16 No Video
Check signal cable connection. Check Cont, Brit key (All max).
Is heater voltage (5.9~6.3V) on SK103's heater Pin? Yes
No
Are D617, Q603 and R631 ok?
No
Replace it.
Yes Is 0V on Q604's collector? No Check and replace Q603, R624, R625.
Yes Is 5V on IC202's Pin 8 No Check and replace IC202.
Yes Check and replace Q604, R621.
17
Is G1 voltage OK at SK103's G1 Pin? Yes Check CN103's connection (G2).
No
Check and replace SK102, C119, Q504, D510, R513, R521, R520, D513, T501.
WAVEFORMS
17 35.2 V (SK103, G1)
CH1 P-P = 35.2 V
CH1 RMS = 80.84 V
Desoldering SK101 and C118, is G2 voltage ok? Yes Is 12 V on IC101's Pins 1 and 7?
No
Check and replace SK101, C118 and then T501.
No
Opening BD102, is it short between IC101's Vcc and ground? Yes Replace IC101.
No
Refer to 7-2-1 No Power.
Yes
15
Is IC101's output on Pins 18, 21 and 23?
No
18
Is clamp signal on IC101's Pin 12?
No
Check and replace IC202 and around it.
7-18
CHA42*7L/5**7L
7 Troubleshooting
7-2-16 No Video Continued
Is IC101's output on Pins 18, 21 and 23? Yes No Is clamp signal on IC101's Pin 12? Yes Refer to 7-2-15 ABL Failure. No Check and replace IC202 and around it.
15
18
Replace IC101.
16
Is IC102's output on Pins 1, 3 and 5? Yes
No
Is 75 V on IC102's Pin 6?
No
Check 75 V line.
Yes Replace IC102.
Are there waveforms on SK103's R, G, B? No Disconnect Video PCB from CRT neck.
Yes
Check again cont, brit key. 6.3 V line, G1, G2 line. Is it ok? Yes
19
Are ther waveforms on SK103's R, G, B? No
Yes
Check and replace SK103 and CRT.
Check and replace Q101R, Q101G, Q101B, Q102R, Q102G, Q102B, D103R, D103G, D103B and PCB pattern.
WAVEFORMS
15 3.16 V (IC101, #21) 16 43.2 V (IC102, #3) 18 5.60 V (IC101, #12) 19 46.4 V (SK103, G)
CH1 P-P = 3.16 V
CH1 RMS = 1.008 V
CH1 P-P = 43.2 V
CH1 RMS = 63.56 V
CH1 P-P = 5.60 V
CH1 RMS = 4.908 V
CH1 P-P = 46.4 V
CH1 RMS = 38.16 V
CHA42*7L/5**7L
7-19
7 Troubleshooting
7-2-17 Micom Failure
Check the connection of signal cable. If signal cable is disconnected, self raster (No Video, Bright Raster) appears.
Check H/V sync from PC or signal generator.
If there is no H/V sync, monitor is operated as DPMS mode.
Check if timing is out of spec or not.
If out of sepc, monitor is operated as stand-by mode. (No Video, LED: 0.5 sec toggle) 14": Horizontal 30 ~ 55 kHz, Vertical 50 ~ 125 Hz 15": Horizontal 30 ~ 61 kHz, Vertical 50 ~ 125 Hz
Key check (all key) : Refer to 7-2-19.
Is 5V on IC202's Pins 9 and 35?
No
Is 13 V on C627?
No
Refer to 7-2-1 No Power.
Yes
Yes Check and replace IC603.
20
Are oscillation (8 MHz) on IC202's Pins 34 and 35? Yes Check reset part. Are Q204, C223 and R210 ok? Yes Check power key (IC202's Pin 2). Normal : 5 V, Pressing key : 0 V Yes
No
Check and replace X201, C205 ,C206.
WAVEFORMS
20 4.92 V (IC202, #33)
No
Replace it.
CH1 P-P = 4.92 V CH1 RMS = 2.912 V
No
Check and replace SW211, IC202.
24 25
Are H/V sync input on IC202's Pins 29 and 30?
Yes
When disconnecting signal cable: Is 0V on IC202's Pin 13? When connecting signal cable: Is 5V on IC202's Pin 13?
No
Cceck and replace R201, IC202, Signal cable.
7-20
CHA42*7L/5**7L
7 Troubleshooting
7-2-17 Micom Failure Continued
Yes When disconnecting signal cable: Is 0V on IC202's Pin 13? When connecting signal cable: Is 5V on IC202's Pin 13? Yes Sus (Pin 7) : 0 V, Off (Pin 8) : 5 V? Yes Check D211 ~ D215. LED is ok? Yes Check PCB pattern to Pins 30 and 31.
26 27
24 25
Are H/V sync input on IC202's Pins 29 and 30? Yes Check signal cable. Yes
No
Cceck and replace R201, IC202, Signal cable.
No
Check signal cable.
No
Replace it.
Yes Are H/V sync input from IC202 on IC401's Pins 1 and 2? Yes Replace IC202. Refer to 7-2-13 I2C Failure. No Check PCB pattern to IC401.
WAVEFORMS
24 5.28 V (IC202, #30) 25 4.96 V (IC202, #30) 26 5.48 V (IC401, #1) 27 4.48 V (IC401, #2)
CH1 P-P = 5.28 V
CH1 RMS = 1.218 V
CH1 P-P = 4.96 V
CH1 RMS = 350 mV
CH1 P-P = 5.48 V
CH1 RMS = 1.362 V
CH1 P-P = 4.48 V
CH1 RMS = 284 mV
CHA42*7L/5**7L
7-21
7 Troubleshooting
7-2-18 Key Check
1) Key Map
Keyout3 (#5) Keyout2 (#4) Keyout1 (#3) Keyin4 (#39) Keyin3 (#40) Keyin2 (#42) Keyin1 (#1)
R241
R242
R243
R244
R245
R246
R247
SW204 (V-Size)
SW203 (H-Size)
SW202 (V-Posi)
SW201 (H-Posi)
SW208 (Cont)
SW207 (Brit)
SW206 (Trap)
SW205 (S-Pin)
SW209 (Up)
SW210 (Down)
2) Voltage Check of Keyin and Keyout Press the key what you want to check. At that moment, the voltage of keyin and keyout that is connected with together should be changed as follows. Normal Keyout Keyin 5V 0V Pressed CH1 of Picture Pin 21 CH2 of Picture Pin 21 RMS voltage 0.7 ~ 0.9 V 0.7 ~ 0.9 V
3) LED Check Pressing key, LED should be blinked. 4) How to Repair? If only one key has a key problem, replace that key. But if some keys that are connected with same keyin or keyout line have problems, check and replace PCB pattern and IC202.
WAVEFORMS
21 5.52 V (IC203, Keyout) 21 5.44 V (IC203, Keyin)
CH1 P-P = 5.52 V
CH1 RMS = 3.696 V
CH1 P-P = 5.44 V
CH1 RMS = 1.436 V
7-22
CHA42*7L/5**7L
7 Troubleshooting
7-2-19 User Control Failure
When pressing keys, does LED blink? Yes Refer to 7-2-18 Key Check. Refer to 7-2-18 Key Check. No Check knob function and space at front cover.
7-2-20 Degaussing Failure
Check if degaussing coil is connected with CN601.
When pressing cont and brit key simultaneously, does the voltage of IC202's Pin 6 vary from 0 V to 5 V for 2~3 seconds? Yes Check and replace Q601, D602, R602, RL602.
No
Refer to 7-2-18 Key Check.
Check and replace degaussing coil.
CHA42*7L/5**7L
7-23
7 Troubleshooting
7-2-21 Horizontal Blank Failure
Symptoms: Dark image and if shifting image to left or right side, image is rolled. Raster left or right side is rolled.
31
Is H_Blank waveform on Q510's collector? No
Yes
WAVEFORMS
Check CN202 and CN202_2.
31 5.36 V (Q510, Collector)
Check and replace IC101.
CH1 P-P = 5.36 V CH1 RMS = 4.210 V
Are Q504 and D517 ok?
No
Replace it.
Yes Check and replace C503, C516, R540, C515.
7-2-22 Whistle Sound
Check trans coil (L401, T501, T601, CRT)
7-2-23 Spot at Center During Power Off
Does G1 voltage vary from 60~80 Vrms to 200 Vrms during power off time? (After falling down to 200V, G1 voltage is slowly increased to 0V). No Are 12 V line and Q504 ok? No Replace it.
CH1 P-P = 158 V CH1 RMS = 151.1 V
WAVEFORMS
Yes Check and replace CRT.
32 158 V (CN202, G1)
32
Yes Check and replace D510, R513, R521, R520, C518.
7-24
CHA42*7L/5**7L
9 Electrical Parts List
9-1 Main PCB Parts
Loc. No. Coordinates (X,Y) BD101 BD102 BD104 BD105 BD401 BD403 BD404 BD405 BD406 BD407 BD502 BD603 BD604 BD605 BD608 BD610 BD611 C101B C101G C101R C103B C103G C103R C104B C104G C104R C106B C106G C106R C107 C110 C111 C112 C113 C114 C115 C116 C117 C118 C119 C120 C121 C122 C123 C124 Code No. 3301-000011 3301-000011 3301-000011 3301-000011 3301-000011 3301-000011 3301-000011 3301-000012 3301-000012 3301-000011 3301-000011 3301-000011 3301-000011 3301-000011 3301-000011 3301-000011 3301-000012 2401-000028 2401-000028 2401-000028 2301-000010 2301-000010 2301-000010 2202-002009 2202-002009 2202-002009 2401-000043 2401-000043 2401-000043 2305-000004 2202-002009 2401-000042 2202-002009 2401-000033 2401-000043 2202-002009 2401-000042 2202-002009 2201-000154 2201-000019 2202-002009 2202-002009 2201-000502 2202-002009 2401-000042 Description CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD CORE-FERRITE BEAD C-AL C-AL C-AL C-FILM,PEF C-FILM,PEF C-FILM,PEF C-CERAMIC,MLC-AXIAL C-CERAMIC,MLC-AXIAL C-CERAMIC,MLC-AXIAL C-AL C-AL C-AL C-FILM,MPEF C-CERAMIC,MLC-AXIAL C-AL C-CERAMIC,MLC-AXIAL C-AL C-AL C-CERAMIC,MLC-AXIAL C-AL C-CERAMIC,MLC-AXIAL C-CERAMIC,DISC CAP-CERAMIC,103Z,2H,DISC C-CERAMIC,MLC-AXIAL C-CERAMIC,MLC-AXIAL C-CERAMIC,DISC C-CERAMIC,MLC-AXIAL C-AL Specification AA,3.5x1.0x5.7mm,1500 AA,3.5x1.0x5.7mm,1500 AA,3.5x1.0x5.7mm,1500 A