Alignment & Adjustments - Samsung CKA4217L Service Manual

5 Alignment and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor. Directions
are given for adjustments using the monitor Interface Board Ver. 2.0 and software (SoftJig).
5-1 Adjustment Conditions
Caution: Changes made without the SoftJig are saved only to the user mode settings. As such, the
settings are not permanently stored and may be inadvertently deleted by the user.
5-1-1 Before Making Adjustments
5-1-1 (a) ORIENTATION
When servicing, always face the monitor to the
east.
5-1-1 (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.
5-1-1 (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.
5-1-1 (d) SIGNAL
Analog, 0.714 Vp-p positive at 75 ohm, internal
termination
Sync: Separate
(TTL level negative/positive)
5-1-1 (e) SCANNING FREQUENCY
Horizontal: 30 kHz to 55 kHz (automatic)
Vertical: 50 Hz to 120 Hz (automatic)
Unless otherwise specified, adjust at the 800 x 600
mode (H : 53.7 kHz, V: 85 Hz) signals.
Refer to Table on page 2-5.
CKA42*7L/5227L
5-1-1 (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.
5-1-1 (g) HIGH VOLTAGE CHECK
No beam
Contrast: Maximum
Brightness: Maximum
Check the high voltage to 24.5 ± 0.5 kV at anode
and GND.
5-1-1 (i) CENTER RASTER
Adjust SW401 so that the back raster comes to the
center when you apply a signal of 53.7 kHz/
85 Hz.
5-1-1 (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)
5-1