Alignment and Adjustments
4-3 Other Adjustments
4-3-1 GeneralIf the chassis or parts of the cabinet become
magnetized, poor color purity will result. If
1. Usually, a color TV needs only slight touch-this happens, use an external degaussing coil.
up adjustment upon installation. Check theSlowly move the degaussing coil around the
basic characteristics such as height, horizontalfaceplate of the picture tube and the sides and
front of the receiver. Slowly withdraw the coil
and vertical sync and focus. to a distance of about 6 feet before removing
2. The picture should have good black and whitepower.
details. There should be no objectionable
color shading; if color shading is present, per-4-3-3 High Voltage Check
form the purity and convergence adjustments
described below.
CAUTION: There is no high voltage adjust-
3. Use the specified test equipment or its equiva-ment on this chassis. The B+ power supply
lent.must be set to +130/155 volts.
(Full color bar input and normal picture
4. Correct impedance matching is essential. level).
5. Avoid overload. Excessive signal from a sweep1. Connect a digital voltmeter to the second
generator might overload the front-end of theanode of the picture tube.
TV. When inserting signal markers, do not
allow the marker generator to distort test2. Turn on the TV. Set the Brightness and
results.Contrast controls to minimum (zero beam cur-
rent).
6. Connect the TV only to an AC power source
with voltage and frequency as specified on the3. The high voltage should not exceed 33KV.
backcover nameplate.
4. Adjust the Brightness and contrast controls to
7. Do not attempt to connect or disconnect anyboth extremes. Ensure that the high voltage
wires while the TV is turned on. Make suredoes not exceed 33KV under any conditions.
that the power cord is disconnected before
replacing any parts.
4-3-4 FOCUS Adjustment
8. To protect against shock hazard, use an isola-
tion transformer.1. Input a black and white signal.
2. Adjust the tuning control for the clearest pic-
4-3-2 Automatic Degaussingture.
A degaussing coil is mounted around the pic-3. Adjust the FOCUS control for well defined
ture tube, so that external degaussing afterscanning lines in the center area of the screen.
moving the TV should be unnecessary. But
the receiver must be properly degaussed upon
installation. 4-3-5 Screen Adjustment
The degaussing coil operates for about 1 sec-1. Turn to the ACTIVE channel.
ond after the power is switched ON. If the set
has been moved or turned in a different direc-2. Adjust the VR screen for a normal picture is
tion, disconnect its AC power for at least 10(no blooming or flyback line).
minutes.
3. Adjust the FOCUS control for well defined
scanning lines in the center area of the screen.
4-6Samsung Electronics |
ACEC
SAMSUNG
