Samsung CF21M, Руководство по обслуживанию

Страница: 5 / 76

4-1-1 Before Making Adjustments
4-1-1 (a) ORIENTATION
When servicing, always face the monitor to the
east.
4-1-1 (b) 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.
4-1-1 (c) SIGNAL
Analog, 0.7 Vp-p positive at 75 ohm, internal
termination
Sync: Separate/Composite
(TTL level negative/positive)
Sync-on-Green:
Composite sync 0.3 Vp-p negative
(Video 0.7 Vp-p positive)
4-1-1 (d) SCANNING FREQUENCY
Horizontal: 30 kHz ~ 115 kHz (Automatic)
Vertical:
50 Hz ~ 160 Hz (Automatic)
Unless otherwise specified, adjust at the
1280 x 1024 mode (H: 91 kHz, V: 85 Hz) signals.
Refer to Table 2-1 on pages 2-2 and 2-3.
4-1-1 (e) HIGH VOLTAGE ADJUSTMENT
Signal: 1280 x 1024 mode (91 kHz/85 Hz)
Display image: Full white
Contrast:
Maximum
Brightness: Maximum
Limit: 27.5 kV ± 0.5 kV
Measure the hight voltage level at the anode cap.
High voltage should be within the limit as above.
4-1-1 (f) G2 (SCREEN) VOLTAGE
The Screen Voltage is fixed in the firm so don’t
need to adjust the Screen voltage.
4-1-1 (g) CENTER RASTER
Adjust VR401 so that the back raster comes to the
center when you apply a signal of 91 kHz/85 Hz.
4-1-2 Required Equipment
The following equipment may be necessary for
adjustment procedures:
4-1-2 (a) DISPLAY CONTROL ADJUSTMENT
1. Non-metallic (–) screwdriver: 1.5 mm
Non-metallic (–) screwdriver: 3 mm
2. Philips (+) screwdriver: 1.5 mm
3. Non-metallic hexkey: 2.5 mm
4. Digital Multimeter (DMM), or
Digital Voltmeter (DVM)
5. Signal generator, or
Computer with a video board that uses the
ET-4000 chipset (strongly recommended if
using Samsung DM 200 software) and that
displays: 1280 x 1024 @ 85 Hz, or 1600 x 1200
@ 85 Hz (maximum).
6. Personal computer
4-1-2 (b) COLOR ADJUSTMENTS
1. All equipment listed in 4-1-2 (a), above
2. Color analyzer, or any luminance
measurement equipmen
4-1-3 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.
CF21M* 4-1
4 Alignment and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor.
4-1 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.