Samsung KCT52A, Training Manual

Page: 86 / 93

KCT52A Chassis
l
SAMSUNG GROUP
l
SAMSUNG GROUP
O
[
O
]
TOC
86
3-3-2 Automatic Degaussing
A degaussing coil is mounted around the picture tube, so
external degaussing after moving the TV should be unneces-
sary. However, the receiver must be properly degaussed upon
installation.
The degaussing coil operates for about 1 second after the
power is switched ON. If the set has been moved or turned in
a different direction, disconnect its AC power for at least 10
Minutes.
If the chassis or parts of the cabinet become magnetized, poor
color purity will result If this happens, use an external
degaussing coil. Slowly move the degaussing coil around the
faceplate of the picture tube and the sides and front of the
receiver. Slowly withdraw the coil to a distance of about 6
feet before removing power.
3-3-3 High Voltage Check
CAUTION: There is no high voltage adjustment on this chas-
sis. The B+ power supply must be set to 130V or
+125V (for "20" screen). Conditions: Full color bar input and
normal picture level.
1. Connect a digital voltmeter to the second anode of the
picture tube.
2. Turn on the TV. Set the Brightness and Contrast con-
trols to minimum (zero beam current).
3. The high voltage should not exceed 29.5KV.
4. Adjust the Brightness and contrast controls to both
extremes. Ensure that the high voltage does not exceed
29.5KV under any conditions.
SIZE 20" 25" 27"
MAX H-VOLTAGE 27.5KV 28.5KV 29.5KV