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COLOR TELEVISION RECEIVER
Chassis : KS7A(P) REV.1
Model : CW25M064NRXXEC
SERVICE Manual
COLOR TELEVISION RECEIVER CONTENTS
1. Specifications
2. Alignment and Adjustments
3. Exploded Views and Parts List
4. Electrical Parts List
5. PCB Diagram
6. Schematic Diagrams
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Specifications
1. Specifications
Count ry INDEX
Or igin Mark Made in Local Country(Fact ory) or Made By Samsung
C ol o r
PAL/SECAM/NTSC4 . 43/NTSC3. 58(NTSC3.58 is option) , ( SECAM-L' , L is option)
demodulat ion
Sound
Quas i - s p l i t ( Related t o VCTI)
receving way
Sound
F Vi rt ual Dol by/Nicam/St ereo/Line St ereo
demodulat ion
I
Ant enna 75ohmDin - Jack( V/U)
X
E C hannel s earch Pr ogrammable F/S
D C hnnel numbers 100 CH PROGRAM MEMORY
Eas t - As ia, Middle- East As ia , Afr ica( 100V ~ 260V ) ,
I nput voltage
Cis ( 160V ~ 300V) , Europe( 230V) , 240V
Po wer Input
50/60H z
fr e quency
Power STR Fr ee Vol t ( X6757) , Single Volt ( X6750)
Pow er insulat ion SMPS/C LD
O
U Recei vi ng ( P/G ) C H V F: 2 ~ 13, U F: 14 ~ 69, C TV: S1~S41
H H A
n
BRAND / BUYER SAMSUNG/Depend on t he Buyer
f
i S afet y Depend on t he count ry
x
Pow er cord/
e CP2/No( 4. 0) , AP 2/Yes , EP2/No
Polar it y
d
* 2T- PI P/1T- PI P/ No PIP
* ANT display( Opt ion)
Cha r act e r
* DNIe Jr ( Opt ion)
* FM Radio(Opt ion)
Samsung Electronics 1-1
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Alignment and Adjustments
2. Alignment and Adjustments
2-1 General Alignment Instructions
1. Usually, a color TV-VCR needs only slight 5. Avoid overload. Excessive signal from a
touch-up adjustment upon installation. Check sweep generator might overload the front-end
the basic characteristics such as height, of the TV. When inserting signal markers, do
horizontal and vertical sync and focus. not allow the marker generator to distort test
results.
2. Observe the picture for good black and white
details. There should be objectionable color 6. Connect the TV only to an AC power source
shading; if color shading is present, with voltage and frequency as specified on the
demagnetize, perform purity and convergence backcover nameplate.
adjustments described below.
7. Do not attempt to connect or disconnect any
3. Use the specified test equipment or its wires while the TV is turned on. Make sure
equivalent. that the power cord is disconnected before
replacing any parts.
4. Correct impedance matching is essential.
8. To protect against shock hazard, use an
isolation transformer.
2-2 Automatic Degaussing
A degaussing coil is mounted around the If the chassis or parts of the cabinet become
picture tube, so that external degaussing after magnetized, poor color purity will result. If
moving the TV should be unnecessary. But this happens, use an external degaussing coil.
the receiver must be properly degaussed upon Slowly move the degaussing coil around the
installation. faceplate of the picture tube and the sides and
front of the receiver. Slowly withdraw the coil
The degaussing coil operates for about 1 to a distance of about 6 feet before turning
second after the power is switched ON. If the power OFF.
set is moved or turned in a different direction,
the power should be OFF for at least 10 If color shading persists, perform the
minutes. following Color purity and Convergence
adjustments.
2-3 High Voltage Check
CAUTION : There is no high voltage adjustment
on this chassis. The B+ power supply should be
+135 volts (with 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
current).
3. Adjust the Brightness and contrast controls to
both extremes. Ensure that the high voltage
does not exceed 30 KV under any conditions.
Samsung Electronics 2-1
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Alignment and Adjustments
2-4 FOCUS Adjustment
1. Iput a crosshatch pattern.
2. Adjust the tuning control for the clearest picture.
3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.
2-5 SCREEN Adjustment
1. Input Toshiba Pattern
If a Toshiba pattern is not available,
Enter "Service Mode" and
select "Test pattern 2"(Toshiba pattern)
ex) IBRM = 175
2. Enter "Service Mode". WDRV = 110
CDL = 250
3. Select "G2-Adjust". COLR G B = 110 110 110
4. Set the values as example
5. Turn the SCREEN VR until "Read Cutoff" and "Read Drive" are green.
(The incorrect SCREEN Voltage may result that "Read Cutoff" and "Read Drive" should be red)
2-6 White Balance Adjustment
1. Warm up the TV set for at least 30 minutes.
2. Enter the Service Mode by pressing the remote control keys in the following sequence:
Power Off