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Alignment and Adjustments (Electrical)
4. Alignment and Adjustments (Electrical)
4-1 Preadjustment
4-1-1 Factory Mode
1. Do not attempt these adjustments in the Video
Mode.
2. The Factory Mode adjustments are necessary when either the EEPROM (IC902) or the CRT is replaced.
3. Do not tamper with the “Adjustment” screen of the Factory Mode menu. This screen is intended only for factory use.
4-1-3 When CRT Is Replaced
Make the following adjustments after setting up purity and convergence:
White Balance
Sub-Brightness
Vertical Center
Vertical Size
Horizontal Size
4-1-2 When EEPROM (IC902S) Is Replaced
1. When IC902 is replaced all adjustment data revert to initial values. It is necessary to reprogram this data.
2. After IC902 is replaced, warm up the TV for
10 seconds.
4-2 Factory (“Service”) Mode
4-2-1 Procedure for the “Adjustment” Mode
1. This mode uses the standard remote control.
The Service Mode is activated by: (1) pressing the “FACTORY” service key on the local-keyboard, or (2) by entering the following remotecontrol sequence (within 2 seconds):
STAND-BY →DISPLAY →MENU→ MUTE→
POWER ON
2. The “SERVICE (FACTORY)” message will be displayed. The Service Mode has three components: Adjustment, Option and Reset.
3. Access the Adjustment Mode by pressing the
“VOLUME” keys ( Up or Down). The adjustment parameters are listed in the accompanying table, and selected by pressing the CHAN-
NEL keys ( ▲,▼).
4. Selection sequences for the
PAL/SECAM B/G, L/systems: down or up key:
AGC>TXP>AFW>SBT>SCT>SCR>STT>RG>
GG>BG>TCT>SC>SL>PVS>PHS>NVS>
NHS>CDL>BKS
5. The VOLUME keys increase or decrease the adjustment values, (stored in the non-volatile memory) when Adjustment Mode is cancelled.
Samsung Electronics 4-1
Alignment and Adjustments (Electrical)
4-2-2 Main Adjustment Parameters
BLR
BLB
AGC2T
PF
RP
YD
CDL
SCL
PWL
OMD
PVS
PHS
NVS
NHS
OSD ABBREVIATION
AGC
XP
QSS
SBT
SCT
SCR
TCT
SC
SL
VA
STT
RG
GG
BG
RANGE
63
7
1
23
23
13
13
63
63
63
1
63
63
63
63
63
63
63
15
3
15
63
63
63
31
3
3
15
NOTE : PVS, PVA, PHS, NVS, NVA,NHS parameters must be aligned using both the 50 Hz and 60 Hz vertical-field rates.
31
27
15
2
2
5
12
26
4
1
27
40
38
22
0
11
30
38
9
38
32
32
INITIAL DATA
28
5
10
6
1
6
4-2-3 AGING Mode (Reference Only)
This pattern is used for pre-heating the CRT during manufacturing--it is accessed in the factory by twice pressing the "FACTORY" key .
Even if the TV power is cut off, the Aging Mode is not cancelled.
The "AGING" marking is displayed on the screen.
The AGINGmode is cancelled by repressing the "FACTORY" key.
4-2 Samsung Electronics
4-2-4 Option
5
6
3
4
BYTE
1
2
7
8
9
4-3 Reset
5
6
3
4
BYTE
1
2
7
8
9
ITEM
Contrast
Bright
Sharpness
Color
Tint
Volume
Program Number
Color System
Sound System
3DB LNA
Panel Lock
Language
Clock
Timer
On Time
Sleep
PICTURE MODE
ITEM
LANGUAGE
SYSTEM
TUNER
HELP MESSAGE
VCR HEAD
G-CODE
ATS OPTION
VPS/PDC
TTX
Alignment and Adjustments (Electrical)
0
EUROPE/URSSIA
CF/CI/CW/CX/CB/CII
1/2
ON/OFF
2HD/2HDLP/4HD/HIFI
SHOWVIEW/VIDEO PLUS/NONE
ON/OFF
PDC/VPS/NONE
ON/OFF
0
Samsung Electronics 4-3
Alignment and Adjustments (Electrical)
4-4 Other Adjustments
4-4-1 General
1. Usually, a color TV needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync and focus.
2. The picture should have good black and white details. There should be no objectionable color shading; if color shading is present, perform the purity and convergence adjustments described below.
3. Use the specified test equipment or its equivalent.
4. Correct impedance matching is essential.
5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the
TV. When inserting signal markers, do not allow the marker generator to distort test results.
6. Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate.
7. Do not attempt to connect or disconnect any wires while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.
8. To protect against shock hazard, use an isolation transformer.
4-4-2 Automatic Degaussing
A degaussing coil is mounted around the picture tube, so that external degaussing after moving the TV should be unnecessary. But 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.
4-4-3 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 current).
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.
4-4 Samsung Electronics
Alignment and Adjustments (Electrical)
4-4-4 FOCUS Adjustment
1. Input a black and white signal.
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.
4-4-5 Screen Adjustment
1. Turn to the ACTIVE channel.
2. Adjust the VR screen for a normal picture is (no blooming or flyback line).
3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.
4-4-6 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. 4-1.
4. Input a black and white signal.
5. Fully demagnetize the receive by applying an external degaussing coil.
6. Turn the CONTRAST and BRIGHTNESS controls to maximum.
7. Loosen the clamp screw holding the yoke. Slide the yoke backward or forward to provide vertical green belt. (Fig. 4-2).
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.
Samsung Electronics 4-5
Alignment and Adjustments (Electrical)
6 Pole Magnet
Clamper
Screw
4 Pole Magnet
2 Pole Magnet
2 POLE
PURITY
Fig. 4 -1 Convergence Magnet Assembly
YOKE
CLAMP
SCREW
6 POLE
CONVERGENCE
4 POLE
CONVERGENCE
Vertical Green Belt
ADJUST
(VERTICA
31m/m
4-4-7 White Balance Adjustment
4-4-7 (A) HIGH-LIGHT ADJUSTMENT
1. Input either a Lion Head or a “pure white” pattern.
2. Warm up the TV for 30 minutes.
3. Check the data in the Service Mode
4. Adjust RG, BG in the Factory Mode.
4-4-7 (B) LOW-LIGHT ADJUSTMENT
1. Automatically accomplished during the high-light adjustment.
4-6
Fig.4-2 Center Convergence Adjustment
Samsung Electronics
4-4-8 Center Convergence Adjustment
1. Warm up the receiver for at least 20 minutes.
2. Adjust the two tabs of the 4 pole magnets to change the angle between them. Superimpose the red and blue vertical lines in the center area of the screen.
3. Adjust the Brightness and Contrast controls for a well defined picture.
4. Adjust the two-tab pairs of the 4 pole magnets, and change the angle between them.
Superimpose the red and the blue vertical lines in the center area of the screen.
Alignment and Adjustments (Electrical)
5. Turn the both tabs at the same time, keeping the angle constant, and superimpose the red and blue horizontal line in the center of the screen.
6. Adjust the two-tab pairs of the 6-pole magnets to superimpose the red and blue line onto the green. (Changing the angle affects the vertical lines, and rotating both magnets affects the horizontal lines.)
7. Repeat adjustments 2~6, if necessary.
8. Since the 4-pole magnets and 6-pole magnets interact, the dot movement is complex
(Fig. 4-3).
BLUE RED
RED/BLUE GREEN
BLUE
RED
RED/BLUE
GREEN
4-Pole Magnet Movement
Fig 4-3 Center Convergence Adjustment
4-4-9 Dual Tuner AFT Adjustment
Test Equipment
1. TV Generator(PM5518, PM5418, ETC)
2. DC VOLTMETER
1. Connect DC Voltmeter to AFT terminal of TUNER IF-MODULE.
2. After selecting P00, input to IF1 terminal of TU002(38.9 MHz Using PM5518)
3. After selecting P00, set to 2.5V±0.2V(Using FRANCE : T101, PAL/SCAM B/G,I,D/K : L102)
6-Pole Magnet Movement
Samsung Electronics 4-7
Alignment and Adjustments (Electrical)
4-5 Electrical Adjustment (VCR Section)
4-5-1 Preparation
Electrical adjustments are required after replacing circuit components and certain mechanical parts.
It is important to perform these adjustment only after all repairs and replacements have been com pleted. Also, do not attempt these adjustments unless the proper equipment is available.
4-5-2 Required Test Equipment
1. Color Television or Monitor
2. Oscilloscope : Wide-band, dual-trace, triggered delayed sweep.
3. DC Voltmeter
4. TV CH Generator
5. Attenuator
6. Recording tape. (Blank tape)
7. Pattern Generator : PAL color bar. 100%
White.
White (75%) signal
White (100%) signal
0.7V
Burst Signal
(as fiat as possible)
0.3V
0.3V
Horizontal sync signal
Fig. 4-5 Color bar signal of pattern generator
White (100%)
White (75%)
1V
0.7V
0.3V
Horizontal sync signal
Color bar signal waveform
Burst
0.3V
Fig. 4-4 Alignment Tape
White
100%
Black
Color bar pattern
Fig. 4-6 Color bar signal of alignment tape (75% Color Bars)
4-8 Samsung Electronics
Alignment and Adjustments (Electrical)
4-5-3 PROGRAM SW
SW
POSITION
I a II b III c IV d V e VI f VII
SW A
SW B
SW C
S/SEN
ON
OFF
OFF
ON
E/SEN
POSITION
STANBY
POWER OFF
LOADING START
LOADING END
REV
PLAY
STOP1
STOP 2
FF / REW 1
FF / REW 2
POWER
OFF
STANDBY
LOAD
END
REV PLAY
LOAD
START
FL SW : ON-less than 3.5v / OFF-more than 3.5v (Input to A/D port)
START / END SENSOR : ON-"L", OFF-"H" : DON'T CARE
SPT1 SPT2 F/R1 F/R2
0
0
1
0
1
0
0
0
1
A
0
PROGRAM S/W
B
0
C
0
0
0
0 ->1
0
0
1
1
1
0
0
0
1
0
1
0
0
1
1
TAPE SEN
X
X
1
1
S
0
1
1
X
X
X
X
X
X
F
0
X
X
X
X
X
X
Eject
OPERATION MODE
Unload POWER OFF
(Tape loading start point)
(Tape loading end point)
Reverse Picture Ssarch, Reverse SLOW
Play, Rec,F-PS,Still,SLOW,F-ADV
Stop (Play position 5 Min. over)
(MAIN Break ON MODE)
High speed Rew, Low speed FF
High speed FF, Low speed Rew
X : DON’T CARE
Samsung Electronics 4-9
MEMO
4-10 Samsung Electronics
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