ADJUSTMENT INSTRUCTION These instructions are applied to only NC-5AA chassis.
Notes 1.So this is a hot chassis, you must be careful, and be caution not to touch 1st and 2nd concurrently. 2.Adjustment must be done in the correct order. 3.Power supply of a SET which is adjusted is 100~240V A.C./50~60Hz. 4.The receiver must be operated for about 30 minutes proir to the adjustment.
2) Connect H.Scope and Pulse output of Sweamer Generator to H.Input and Marker input of Alignment Scope, respectively. 3) Apply AGC Voltage(D.C.) to TP11 of IC201.(7.5±0.05V) 4) Apply B+ of IC201 to TP12 of R591.(12.0±0.1V) 5) Set VR526(AGC Adjustment) to mechanical center.
1.3. Adjustment A. VCO 1) Set the vertical range of Alignment Scope to 1V/DIV and CAL position, and, by applying D.C. 0~9V, do DC Calibration to place D.C 4.5V point of waveform to center of Screen. 2) Connect the Input terminal of Alignment Scope to TP3(Video Detection Output), and set Vertical Variable Switch to CAL position. 3) Apply AGC Voltage to TP11 of IC201 through 470§ to be 7.5±0.05V 4) Adjust L501 so that BEAT appears on 45.75MHz Marker like If not, adjust again after attenuating output 10 ~20dBu. f (MHz) 42.75 45.0 47.25
CONTENTS 1) VIF, AFT and SIF Adjustment 2) Sound Multiplex Adjustment 3) FOCUS Adjustment 4) AGC Adjustment 4)-1 Picture AGC Adjustment 5) V-Size and V-Center Adjustment 6) Horizontal Size, Center and Side Pincushion Adjustment 7) Purity and Convergence Adjustment 8) White Balance Adjustment 9) SUB-Bright Adjustment 10) Vertical Center Adjustment 11) Horizontal Center Adjustment
1. VCO and AFT Adjustment This Adjustment must be applied only to PCB Assy.
1.1. Necessary Instruments 1) Sweamer Generator : can sweep 35MHz~55MHz(over 120dBu) 2) PLUG in Unit : With PIF(45.75MHz), SIF(41.25MHz) Marker 3) Alignment Scope : X-Y mode, 10mV~20V Variable 4) D.C. Power Supply : 0~12V Variable 5) D.C. Power Supply : 13.5V±0.2V (over 300mA) 6) Digital Multimeter
45.75MHz (Turn L105 so that the position of Beat is same with 45.75MHz Marker)
B. AFT 1) Connect the Input of Alignment Scope to TP4 with keeping DC voltage of 2pin of IC201. 2) Keep the output of Sweamer Generator 100±5dBu. 3) Adjust L506 so that waveform of Alignment Scope to be that of . 4) Adjust Vertical Volume of Alignment Scope to place DC level of waveform to center (4.5V) and 45.75MHz Marker to 7.5V¡ 0.5V. 45.75 MARKER
1.2. Preliminary Steps 1) Connect the output of Sweamer Generator like . Here, set the output of Sweamer Gen. to 100±5dBu. POWER SUPPLY +
470/0.5W
7.5V TP11 +
VCO COIL 2 51
L501
9V 8V
C508
50
TP4 47 R507 TUNER IF
TP2
SAW FILTER
C122 9 R520
AFT COIL 9V
L506
IC501 LA7674
46 45 C521
AFT
8
0V Q503
44 11 R518 14
R517 L503 Z502
VCO
TP3 12.5V +
L502 SWEEMAR GENERATOR
2. SIF Adjustment 2.1. Necessary Instruments 1) Sweamer Generator : can sweep 3~6MHz 2) Plug In Unit : with 4.5MHz Marker 3) Alignment Scope : X-Y mode(can measurable 10mV~ 20Vp-p) 4) DC Power Supply : 13.5V, over 300mA 5) DC Power Supply : 0~12V variable
R591 D502 + -ALIGNMENT SCOPE
POWER
-
SUPPLY +B
TP12
- 1 -
2.2. Adjustment 1) Connect Sweamer Generator and Alignment Scope the same method of VIF adjustment. 2) Connect the output of Sweamer Generator to TP5 like . 3) Connect the Input of Alignment Scope to TP6. 4) Apply AGC voltage of IC201 to TP11(7.5±0.05V). 5) Apply B+ of IC201 to TP12. 6) Adjust L502 S-shaped waveform of Alignment Scope to be that of . Adjust (A=B) Because 4.5MHz Marker doesn't with horizontal line, apply (a) marker(4.5MHz) to be the center of (b), (c)Markers. ALIGNMENT SCOPE
100% WHITE
75% WHITE
A B
DC POWER SUPPLY DC 12V
R591
TP12
TP13
DC POWER SUPPLY DC 12.5V
C206
ZD201
PATTERN GENERATOR
TP6 POWER SUPPLY +
1
8 7
VR202 Q202
1 C509
A/V IN VIDEO
2
TP8 R210
Q206 3
470/0.5W
7.5V TP11 +
IC202
6 5
Q201 L201 C201
VIDEO TP10 D SOUND
SWEEMAR GENERATOR 2 SOUND
A
C204
4
C508 1 8 7 Q601 C510
SIF COIL
L502 4
C507
Q603
2 3
IC501 LA7674 TP5 C515
R609
IC601
6 R618
11 14
45 C516
COLD
HOT
OSCILLOSCOPE 6.0MHz
Z501
R591
12.5V + POWER
3.3 Adjustment TP12
SUPPLY +B
9V
Adjust VR202 to get Luminance signal(Color Bar) level like below. ( Refer to ) 1) White 100% modulated 1.78±0.1Vp-p 2) White 75% modulated 1.46±0.1Vp-p
4. Automatic Gain Control(AGC) Adjustment (b) A
A=B B
(a) 4.5 MARKER
4.1Turn on a SET and receive Digital Pattern of 65¡ 1dB through 75§ Ant. terminal. 4.2 Connect DMM(Digital Multi-Meter) to J27. 4.3 Adjust VR101 to read 5.7±0.05V of DMM. (Where, you can set proper AGC voltage according to signal condition.)
(c) 0V
5. Purity and Convergence Adjustment This adjustment should be made when a complete re-alignment is required or a new picture tube is installed.
5.1 Purity Adjustment 5.1.1 Necessary instruments and Preliminary steps 1) Pattern Generator : 216/1 or Equivalents 2) Degauss CPT and Cabinet with Degaussing coil. 3) Maximize Contrast level. 4) Pre-adjust the DY.
3. Composite Video Signal Adjustment 3.1.Necessary Instruments 1) Pattern Generator : PM5518(PHILIPS) or Equivalents 7 Step Color Bar Pattern with 75§ out 2) Oscilloscope : VP-5650A or Equivalents can measure over 1.0Vp-p Vertical Freq. : over 4MHz 3) DC Power Supply : 12.2±0.2V/400mA 2EA
5.1.2 Adjustment 1) Receive Raster signal(Red). 2) Push the DY to get Picture like . 3) Adjust 2-pole magnet to place RED center of screen orthogonally.
3.2. Preliminary Steps 1) Connect the output of Pattern Generator to TP8 like . Where, the output of Pattern Generator is 1.0Vp-p.(Point position "A") 2) Connect DC Power Supply to TP12 and TP13. Where, devide Ground of TP12 and TP13(HOT/COLD). 3) Connect probe to TP10(point "D").
B
R
G
- 2 -
4) Pre-fix 2-pole magnet after adjustment with Lock Ring. 5) Pull the DY back slowly to get uniformly RED picture and fix it.
6. White Balance 6.1 White Balance Adjustment 6.1.1 Necessary Instrument 1) White BAlance Meter
6.1.2 Preliminary Steps 1) Do this adjustment after operating the SET more than 30 minutes. 2) Receive Standard White pattern. 3) Adjust under "APC ON" condition. 4) Turn Screen VR CCW. 5) Set Red driver(VR571) and Blue driver(VR572) to mechanical center. 6) Set Red Bias(VR574) ,Blue Bias(VR575) and Green Bias(VR573) to 1/3 point to Clock-wise from full CCW. 7) Set SVC SW to "SVC" to get Horizontal line.
5.2.2 Preliminary Steps 1) Do this adjustment after operating the SET more than 30 minutes. 2) Degauss CPT and Cabinet with Degaussing coil. 3) Receive Cross hatch pattern. 4) Adjust Contrast and Bright properly. 5) Untighten half-fixed Magnet Assy lock ring
6.1.3 Adjustment 5.2.3 Adjustment A. Center(Static) Convergence Adjustment 1) Unify Red and Blue vertical lines at center of screen by varying the angle of two tabs of 4-pole magnet. 2) Rotate tab with sustaining the angle of item 1) and unify Red and Blue vertical lines at center of screen. 3) Unify Red,Blue and Green vertical lines by adjusting two tab2 of 6-pole magnet. 4) Rotate tab with sustaining the angle of item 3) and unify Red,Blue and Green vertical lines. 5) To get more detail adjustment repeat 1),2) with remembering changes of Red,Blue and Green. 6) Fix magnet assy lock ring. B. Dynamic Convergence Adjustment 1) Prepare bonded rubber wedge. 2) Adhere rubber wedge to "A" part halfly. (Don't remove paper of bonding part.) 3) Move the DY every direction to get best convergence in every corner. 4) Adhere rubber wedge to bottom of CPT.(Refer ). 5) After checking the locatons of 3 wedges and check Convergence. 6) Paint white lacquer on DY fixing nut and magnet. ADHESIVE TAPE DEFLECTION YOKE PURITY &CONVERGENCE MAGNET ASSEMBLY
1) Turn screen VR slowly to see first horizontal line on screen 2) Make horizontal line white with 2 Bias VRs which aren't displayed in 1). 3) Vary screen VR to get very dim horizontal line. 4) Set SVC SW to "Normal" position. 5) Receive adjustment signal-White in upper and Black in Lower. 6) Vary Red driver(VR571) and Blue driver(VR572) to get White screen in White. 7) Vary Bias and Drivers to get the best screen in White and Black. 8) Check adjustment condition with White Balance Meter. 9) Refer below for Adjustment
Color Temperature 10,000K High Light : 40fl Low Right : 4fl
X 0.281
Y 0.288
7. Focus Adjustment 1) Receive Digital pattern. 2) Set screen conditon to "APC ON". 3) Turn Focus VR to get the best condition in center and every corner.
8. Sub-Bright Adjustment 1) Receive Digital pattern. 2) Do this adjustment after operating the SET more than 30 minutes. 3) After selecting Sub-mode with SVC Remocon and vary to distinguish 4 and 5 step of Gray scale.
, ,,,,
RUBBER WEDGES
PURITY MAGNET 4-POLE
GLASS CLOTH TAPE
9. Vertical Size Adjustment 1) Receive Digital pattern and set screen conditon to "APC ON". 2) Vary Vertical Size adjustment VR(VR301) to reach inner circle of large circle to edge of frame.
TEMPORARY MOUNTING
30¡£
30¡£
10. Vertical Center Adjustment ADHESIVE
DEFLECTION YOKE 30¡£ RUBBER WEDGES LOCA TION
1) Receive Digital pattern and set screen condition to "APC ON". 2) Adjust the center of screen with SVC SW(SW301) to place center.
11. Horizontal Center Adjustment 1) Receive Digital pattern and set screen condition to "APC ON". 2) Adjust the center of screen with VR505 to place center.
- 3 -
HOT
COLD IC601 3 AUDIO IN VIDEO IN
Q603 T403
JA001
IC501 PRE-AMP. Z101 VIF
TU100 Q102
8
SIF 9
LA7674 AFT
48
SIF-IN SFE4.5
IC202 40 Q208
TUNER VCO LOCK CLOCK DATA CS 5V 12V 33V
50
44 34 6 21 H V
DET-OUT
IC1 13
SHARP 51 BRI 45 COLOR AFT TINT 46 CONT
IC602 TPS4.5 -Y
1
TDA 2006
4
SP
BLOCK DIAGRM
TX
PA1
PRE-AMP IC2
TMP67CC31 35
23 28 CPT PCB R, G, B, Ys
R-Y, B-Y, G-Y H.Vcc of IC501
CPT
- 1 D/G COIL
EEPROM
SDA/SCL
D/G 26 FBP FROM FBT 39 41 PWR Q11
IC301 2 12 Q402 Q401 H. D. T 1877
Q10
RL801 12V Q806
5V
T402 FBT Q805
D801
SMPS TRANS 3 1 6 5 8 24V CPT 180V TO IC1 TO CPT TO T403 HT 24V 12V FBP