4-3-3 High Voltage Check
CAUTION: There is no high voltage adjustment on this chassis.
The B+ power supply must be set to +125 volts (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 controls to minimum (zero beam cur-
rent).
3. The high voltage should not exceed 27.5KV.
4. Adjust the Brightness and contrast controls to
both extremes. Ensure that the high voltage
does not exceed 27.5KV under any conditions.
4-3-4 FOCUS Adjustment
1. Input a black and white signal.
2. Adjust the tuning control for the clearest pic-
ture.
3. Adjust the FOCUS control for well defined
scanning lines in the center area of the screen.
4-3-5 Cathode Voltage Adjustment
(Screen Adjustment)
1. Connect CRT socket pin GK to an oscilloscope
probe.
2. Input a gray scale pattern. (Use a pattern gen-
erator, PM5518)
3. Use the P mode key (on the remote control)
for the STANDARD picture.
4. Adjust the Screen VR (on the FBT) so that the
voltage on the oscilloscope becomes 130+2.5V
(See Fig. 4-1).
4-3-6 Purity Adjustment
1. Warm up the receiver for at least 20 minutes.
2. Plug in the CRT deflection yoke and tighten
the clamp screw.
3. Plug the convergence yoke into the CRT and
set in as shown in Fig. 4-2.
4. Input a black and white signal.
5. Fully demagnetize the receive by applying an
external degaussing coil.
6. Turn the CONTRAST and BRIGHTNESS con-
trols to maximum.
7. Loosen the clamp screw holding the yoke.
Slide the yoke backward or forward to pro-
vide vertical green belt. (Fig. 4-3).
8. Tighten the convergence yoke.
9. Slowly move the deflection yoke forward,
and adjust for the best overall green screen.
10. Temporarily tighten the deflection yoke.
11. Produce blue and red rasters by adjusting the
low-light controls. Check for good purity in
each field.
12. Tighten the deflection yoke.
Alignment and Adjustments
4-16
Samsung Electronics
Fig. 4-1
130 2.5V
+_
GND
14, 16" :120 2.5V
20, 21" : 130 2.5V
+_
+_
_
Summary of Contents for CK331EZR4X/BWT
Page 2: ...ELECTRONICS Samsung Electronics Co Ltd MAY 1998 Printed in Korea 3SCT13B 31K101 ...
Page 10: ...2 4 Samsung Electronics MEMO ...
Page 14: ...3 4 Samsung Electronics MEMO MEMO ...
Page 34: ...MEMO 4 20 Samsung Electronics ...
Page 47: ...10 2 Samsung Electronics MEMO ...
Page 48: ...Schematic Diagrams 11 1 Samsung Electronics 11 Schematic Diagrams 11 1 TTX Micom ...
Page 49: ...Schematic Diagrams 11 2 Samsung Electronics 11 2 W O TTX Micom ...
Page 50: ...Schematic Diagrams 11 3 Samsung Electronics 11 3 ONE CHIP CHROMA Block ...
Page 51: ...Schematic Diagrams 11 4 Samsung Electronics 11 4 IF Sound EXT A V Block ...
Page 52: ...Schematic Diagrams 11 5 Samsung Electronics 11 5 Power Vertical Horizontal CRT ...
Page 53: ...Schematic Diagrams 11 6 Samsung Electronics 11 6 A V Front SUB ...
