Alignment & Adjustments - Samsung SyncMaster 1000s Service Manual

6 Alignment and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor. Direction
is given for adjustment using the RS232C Serial Communications Adapter and software.
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/Composite
(TTL level negative/positive)
Sync-on-Green:
Composite sync 0.286 Vp-p negative
(Video 0.714 Vp-p positive)
6-1-1 (e) SCANNING FREQUENCY
Horizontal: 30 kHz to 96 kHz
Vertical: 50 Hz to 160 Hz
All modes must be individually adjusted and
adjustments saved. This monitor does not
automatically adjust each mode.
Refer to Table 3-1 on page 3-3.
SyncMaster 1000s (CGP1607L)
6-1-1 (f) HIGH VOLTAGE AND +B 195V LINE ADJUSTMENT
Signal: 1024 x 768 mode
(68 kHz/85 Hz)
Display image: Full white
Contrast: Maximum
Brightness: Maximum
Limit: 27.5 kV ± 0.5 kV
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. Adjust VR501 on the Main PCB so that the
high voltage measures 27.5 kV ± 0.5 kV.
2. Using a soldering iron, melt the adjustment
cap on VR501 to prevent any movement.
6-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT
Signal: 1024 x 768 mode
(68 kHz/85 Hz)
Display image: Crosshatch pattern
Contrast: Maximum
Brightness: Maximum
Adjust the Screen VR of the FBT so that the G2
(Screen) Voltage for Hitachi is 530 V ± 10 V.
6-1-1 (h) CENTER RASTER
Signal: 1024 x 768 mode (68 kHz/85 Hz)
Display image: Crosshatch pattern
Contrast: Maximum
Brightness: Maximum
Adjust VR401 so that the back raster comes to the
center.
6-1-1 (i) BRIGHTNESS AND CONTRAST
Unless otherwise specified, adjust control buttons:
Brightness: Maximum
Contrast: Maximum
6-1