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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. 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 70 kHz (Automatic) Vertical: 50 Hz to 160 Hz (Automatic) Unless otherwise specified, adjust at the 16Ó/17Ó: 1024 x 768 mode (68 kHz/85 Hz), 15Ó: 800 x 600 mode (54 kHz/85 Hz) signals. Refer to Table 3-1 on page 3-3.
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: 1024 x 768 @ 85 Hz, or 800 x 600 @ 85 Hz (minimum). 6. Personal computer 7. Required software: Softjig.exe from Samsung which includes the cg17e.c data file 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 AssÕy (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
CHB5**7L/6**7L/7**7L
6-1
6 Alignment and Adjustments
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.
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR PARALLEL CABLE PC SIGNAL GENERATOR SIGNAL CABLE
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.
6-1-5
6-1-5 (a) HIGH VOLTAGE ADJUSTMENT Signal: No signal Display image: Self raster Contrast: Maximum Brightness: Maximum Limit: 26 kV ± 0.2 kV (17Ó) 25 kV ± 0.2 kV (15Ó/16Ó) Measure the high voltage level at the anode cap. High voltage should be within the limit as above. If the high voltage needs adjustment use the following procedure. PROCEDURE 1. Increase or decrease HFV to adjust the high voltage to limit. 2. Click factory save. 6-1-5 (b) G2 (SCREEN) VOLTAGE ADJUSTMENT Signal: No signal Display image: Self raster Contrast: Maximum Brightness: Maximum Adjust the Screen VR of the FBT so that the G2 (Screen) Voltage for 17Ó SDD CRT: 470 V ± 10 V, TSB CRT: 630 V ± 10 V for 16Ó SDD CRT: 410 V ± 10 V for 15Ó SDD CRT: 560 V ± 10 V, TSB CRT: 630 V ± 10 V. 6-1-5 (c) CENTER RASTER Adjust SW451 so that the back raster comes to the center when you apply a signal of 60 kHz/75 Hz.
3-WIRE CABLE
Figure 6-1. Setup 1, With Signal Generator
MONITOR INTERFACE BOARD VER. 2.0 5V DC ADAPTOR SIGNAL CABLE PARALLEL CABLE PC D-SUB CONNECTOR 3-WIRE CABLE
Figure 6-2. Setup 2, Without Signal Generator
6-2
CHB5**7L/6**7L/7**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: 306 mm (H) x 230 mm (V) for 17Ó, 290 mm (H) x 217.5 mm (V) for 16Ó, 267 mm (H) x 200 mm (V) for 15Ó. Adjust the horizontal position and vertical position to ² 4.0 mm of the center point of the screen. |A-B| ² 4.0 mm.
C DISPLAY AREA A B EDGE OF BEZEL D
6-2-1 (c) HORIZONTAL POSITION ADJUSTMENT CONDITIONS Scanning frequency: Display image: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern
Click on the << or >> box next to H_POSI to center the horizontal image on the raster. 6-3-1 (d) VERTICAL POSITION ADJUSTMENT CONDITIONS Scanning frequency: Display image: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern
|C-D| ² 4.0 mm.
Click on the << or >> box next to V_POSI to center the vertical image 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 6-2 and 6-3, an image appears distorted, elongated or squashed. Table 6-1. Standard Modes Linearity: 640x480/75Hz, 800x600/85Hz and 1024x768/85Hz
Standard Modes Linearity Each block (10 %) 4:3 Difference between adjacent blocks (4 %)
Figure 6-3. Centering 6-2-1 (a) HORIZONTAL SIZE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern Maximum Maximum
Click on the << or >> box next to B+OUT to adjust the horizontal size of the display pattern to 306 mm (17Ó), 290 mm (16Ó) and 267 mm (15Ó). (Tolerance: ± 3 mm.) 6-2-1 (b) VERTICAL SIZE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern Maximum Maximum
Horizontal: 18.2~20.1 Horizontal: Less than 0.77 mm Vertical : 18.2~20.1 Vertical : Less than 0.77 mm Horizontal: 17.1~18.9 Horizontal: Less than 0.72 mm Vertical : 18.2~20.1 Vertical : Less than 0.77 mm
5:4
Table 6-2. Other Modes Linearity: VGA, SVGA, XGA, MAC, etc.
Supported Timing Mode Each block (10 %) 4:3 Horizontal: 17.8~20.5 Vertical : 17.8~20.5 Horizontal: 16.7~19.2 Vertical : 17.8~20.5 Difference between adjacent blocks (5 %) Horizontal: Less than 0.96 mm Vertical : Less than 0.96 mm Horizontal: Less than 0.90 mm Vertical : Less than 0.96 mm
Click on the << or >> box next to V_SIZE to adjust the vertical size of the display pattern to 230 mm (17Ó), 217.5 mm (16Ó) and 200 mm (15Ó). (Tolerance: ± 3 mm.)
5:4
CHB5**7L/6**7L/7**7L
6-3
6 Alignment and Adjustments 6-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT CONDITIONS Scanning frequency: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum To adjust the Horizontal Linearity, refer to Tables 6-1 and 6-2 for the tolerance range. Increase or decrease H_LIN to optimize the image. 6-2-2 (b) VERTICAL LINEARITY ADJUSTMENT CONDITIONS Scanning frequency: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Display image: Crosshatch pattern Brightness: Maximum Contrast: Maximum To adjust the Vertical Linearity, refer to Tables 6-1 and 6-2 for the tolerance range. Increase or decrease V_LIN to optimize the image.
6-2-4 Pinbalance Adjustment
CONDITIONS Scanning frequency: Display image: Brightness: Contrast:
D1
68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern Maximum Maximum
D2 D1
Figure 6-5. Pinbalance Increase or decrease PIN_BAL to optimize the image.
6-2-5 Parallelogram Adjustment
CONDITIONS Scanning Frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern Maximum Maximum
6-2-3 Trapezoid Adjustment
CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern Maximum Maximum
Increase or decrease PARALL to make the image area rectangular.
Increase or decrease TRAPE to make the image area rectangular.
| A - B | < 4 mm A A
4 mm
Figure 6-6. Parallelogram
B
B
Figure 6-4. Trapezoid
6-4
CHB5**7L/6**7L/7**7L
6 Alignment and Adjustments
6-2-6 Side Pincushion Adjustment
CONDITIONS Scanning frequency: Display image: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern
6-2-7 Tilt Adjustment
CONDITIONS Scanning Frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Crosshatch pattern Maximum Maximum
Increase or decrease BARREL to straighten the sides of the image area.
| C1 |, | C2 | 2.0 mm, | D1 |, | D2 | 2.0 mm. C2
Increase or decrease ROTATE to correct the tilt of the display.
6-2-8 Degauss
D1 D2
No adjustments are available for the degaussing circuit. The degaussing circuit can effectively function only once per 30 minutes.
6-2-9 To Delete the User Mode Data
C1
Figure 6-7. Pincushion
To delete the adjustment data from the user modes, click USER DELETE.
6-2-10 Save the Data
To save the adjustment data for a mode, press FACTORY SAVE.
CHB5**7L/6**7L/7**7L
6-5
6 Alignment and Adjustments
6-3 Color 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: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Display image: White flat field at center of display area Luminance: Maximum PROCEDURE Use the directions in sections 6-3-2 through 6-3-3 to adjust the color coordinates for: 9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02 6500K to x = 0.313 ± 0.02, y = 0.329 ± 0.02 6-3-2 (b) G-GAIN ADJUSTMENT
1/3H-1/2H FRONT BEZEL OPENING 1/3V-1/2V BACK RASTER GREEN WINDOW
Figure 6-8. Green Box Pattern CONDITIONS Scanning frequency: Display image: Brightness: Contrast:
68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Green box pattern Maximum Maximum
6-3-2 Color Adjustments for 9300K
6-3-2 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast:
1. Increase or decrease G_GAIN to adjust the brightness of the Green Gain to 40 ± 1 ft-L. (only 17Ó S-2 CDT : 37 ft-L) Note: If you canÕt increase the Green Gain to the appropriate value, click on the >> box next to increase the ABL point. 6-3-2 (c) WHITE BALANCE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Full white pattern Maximum Maximum
FRONT BEZEL OPENING BACK RASTER WHITE WINDOW
68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Back raster pattern Maximum Maximum
1. Select COLOR CHANNEL 1 to control the color for 9300K. 2. Adjust the luminance of the back raster to between 0.5 to 0.7 ft-L using the G_CUT controls. 3. Increase or decrease B_CUT to set the ÒyÓ coordinate to 0.298 ± 0.02. 4. Increase or decrease R_CUT to set the ÒxÓ coordinate to 0.283 ± 0.02.
Figure 6-9. Full White Pattern
6-6
CHB5**7L/6**7L/7**7L
6 Alignment and Adjustments 1. Increase or decrease R_GAIN and B_GAIN to make the video white. (For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02.) Note: Do not touch the G_GAIN controls. 2. Check the ABL. If it is not within the specifications (37 ± 1 ft-L), use the ABL controls to adjust it. (17Ó S-2 CDT: 35 ft-L, 16Ó CDT 33 ft-L) 3. Select COLOR FACTORY SAVE to save the data. 4. Select ALL MODE SAVE to save the CH2. 6-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION CONDITIONS Scanning frequency: Display image: X-Y Coordinates: ABL Luminance Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Back raster pattern x = 0.283 ± 0.02, y = 0.298 ± 0.02 35 ± 1 ft-L 33 ± 1 ft-L (16Ó CDT) Maximum Maximum
6-3-3 Color Adjustments for 6500K
6-3-3 (a) BACK RASTER COLOR ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Back raster pattern Maximum Maximum
1. Select COLOR CHANNEL 2 to control the color for 6500K. 2. Adjust the luminance of the back raster to between 0.5 to 0.7 ft-L using the G_CUT controls. Note: For 6500K adjustments you must not change the Screen VR of the FBT. To do so changes the 9300K setting values. 3. Increase or decrease R_CUT and B_CUT to adjust the R-Bias to x = 0.313 ± 0.02 and the B-Bias to y = 0.329 ± 0.02. 6-3-3 (b) G-GAIN ADJUSTMENT This procedure is the same as that for 9300K, refer to the procedure on page 6-6. 6-3-3 (c) WHITE BALANCE ADJUSTMENT CONDITIONS Scanning frequency: Display image: Brightness: Contrast: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) Full white pattern Maximum Maximum
1. Check whether the color coordinates of the back raster satisfy the above spec. If they do not, return to 6-3-2 (a) and readjust all settings. 2. Display a full white pattern. Note: Do not touch the G_GAIN controls.
3. Adjust the Contrast Control on the monitor so that the luminance of the video is about 5 ft-L. 4. Check whether the white coordinates of the video meet the above coordinates spec. 5. Adjust the Contrast Control again so that the luminance of the video is about 24 ft-L. 6. Check whether the white coordinates of the video satisfies the above spec. If they do not, return to 6-3-2 (a) and readjust all settings.
1. Increase or decrease R_GAIN and B_GAIN to make the video white. (For 6500K color adjustment: x = 0.313 ± 0.02, y = 0.329 ± 0.02.) 2. Refer to the procedure for 9300K, section 6-3-2 (c) steps 2 and 3. 6-3-3 (d) WHITE BALANCE ADJUSTMENT VERIFICATION Refer to the procedure for 9300K, section 6-3-2 (d).
CHB5**7L/6**7L/7**7L
6-7
6 Alignment and Adjustments
6-3-4 Luminance Uniformity Check
Luminance is considered uniform only if the ratio of lowest to highest brightness areas on the screen is not less than 7.5:10. CONDITIONS Scanning frequency:
CONDITIONS Orientation: Scanning frequency: Display image: Luminance:
Display image: Brightness: Contrast:
68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) (1024 x 768) White flat field Cut off point at 24 ft-L Maximum
Monitor facing east 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) White flat field Cut off point at the center of the display area
Note: 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. 2. Very carefully break the glue seal between the 2-pole purity convergence magnets (PCM), the band and the spacer (see Figures 6-12). 3. Make sure the spacing between the PCM assembly and the CRT stem is 29 mm ± 1 mm.
PROCEDURE Measure luminance at nine points on the display screen (see figure below).
Figure 6-10. Luminance Uniformity Check Locations
4. Display a green pattern over the entire display area. 5. Adjust the purity magnet rings on the PCM assembly to display a pure green pattern. (Optimum setting: x = 0.295 ± 0.015, y = 0.594 ± 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 = 0.640 ± 0.015 x = 0.295 ± 0.015 x = 0.142 ± 0.015 y = 0.323 ± 0.015 y = 0.594 ± 0.015 y = 0.066 ± 0.015
6-3-5 Focus Adjustment
CONDITIONS Scanning frequency: 68 kHz/85 Hz (17Ó/16Ó) 54 kHz/85 Hz (15Ó) (1024 x 768) ÒHÓ character pattern Cut off point Maximum
Display image: Brightness: Contrast:
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.
(For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02)
6-3-6 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.
7. When you have the PCMs properly adjusted, carefully glue them together to prevent their movement during shipping.
6-8
CHB5**7L/6**7L/7**7L
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 Circle (A) Circle (B) Edge (C) Error in mm 0.25 0.3 0.35
1 11
115 MM C 230 MM B A
CRT Dot Pitch 0.28 0.28 0.28
306 MM
Figure 6-13. Convergence Measurement Areas
6-4-1 Static (Center) Convergence
CRT FRONT
10
2 3 4 5 6 7 8 9
Static convergence involves alignment of the red, blue and green lines in the center area of the display. See ÒDynamic ConvergenceÓ for alignment of the color fields around the edges of the display. CONDITIONS Direction: Warm-up: Display image: Tolerances:
Samsung SDD CRT
1 Setup Bolt 5 Spacer 9 Holder 2 Bow Magnet 6 4-Pole Magnet 10 Band 3 Band 7 Spacer 11 Tabs 4 2-Pole Magnet 8 6-Pole Magnet
Monitor facing east 30 minutes Crosshatch pattern See Table 6-4
Figure 6-11. Magnet Configuration
PROCEDURE As shown in Figure 6-11, the CRT used in these monitors has the same magnet configuration as shown in Table 6-5 below. Table 6-5. Magnet Order
1 11
CRT Manufacturer SDD
CRT FRONT
Magnet Order from Front of CRT Convergence bow, 2-pole, 4-pole, 6-pole Convergence bow, 2-pole, 6-pole, 4-pole
Toshiba
10
2 3 4 5 6 7 8 9
Use the following steps to correct any static misconvergence: 1. Make sure the display is not affected by external magnetic fields. 2. Locate the pair of 4-pole magnet rings. 3. Unlock the rings and rotate the individual rings (change the spacing between tabs) to converge the vertical red and blue lines. 4. Rotate the pair of rings (maintaining the spacing between tabs) to converge the horizontal red and blue lines.
Toshiba CRT
1 Setup Bolt 5 Band 9 Holder 2 Bow Magnet 6 6-Pole Magnet 10 Band 3 Spacer 7 Spacer 11 Tabs 4 2-Pole Magnet 8 4-Pole Magnet
Figure 6-12. Toshiba Magnet Configuration
CHB5**7L/6**7L/7**7L
6-9
6 Alignment and Adjustments 5. After completing the red and blue center convergence adjustment, locate the pair of 6-pole magnet rings. 6. Rotate the individual rings (change the spacing between tabs) to converge the vertical red and blue (magenta) and green lines. 7. 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. 8. 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. 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 rubber magnets on the back of the CRT to correct the misconvergence. Be careful not to remove the paper protecting the adhesive on the magnets 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 magnets 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.
6-4-2 Dynamic (Edge) Convergence
Use the following procedure to correct minor dynamic (edge) misconvergence. If, after using this procedure, dynamic misconvergence around the periphery of the display area is still greater than the tolerance, contact the Regional After Service Center for possible CRT replacement.
!
Figure 6-14. 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
6-10
CHB5**7L/6**7L/7**7L
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: Flat-head (Ð) screwdriver, 1.5 mm Philips (+) screwdriver, 1.5 mm Hexkey, 2.5 mm PROCEDURE Bow convergence adjustments are not available for the CRTs used in the CHB5**7L/6**7L/7**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 Figures 6-12 and 6-13). 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 6-17. Horizontal Line Balance Misconvergence 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. HORIZONTAL BALANCE COIL Figure 6-18. Vertical Line Balance Misconvergence Use a 1.5 mm screwdriver (flat-head [Ð] for SDD DYs and phillips type [+] for Toshiba DYs) at the YH variable register. Turning the VR 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
YH Xv Yv
Figure 6-15. SDD Deflection Yoke
RED BLUE
RED BLUE
Figure 6-19. Upper and Lower Balance Misconvergence
YH YV
XV
Figure 6-16. Toshiba Deflection Yoke
Use a 1.5 mm screwdriver (flat-head [Ð] for SDD DYs and phillips type [+] for Toshiba DYs) at the Yv variable register. 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.
CHB5**7L/6**7L/7**7L
6-11
6 Alignment and Adjustments
Memo
6-12
CHB5**7L/6**7L/7**7L