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SERBIKE
CAUTION
Before Servicing
MAWAL
`,:, "
TCl9i'm
the chassis. read the "IMPORTANT SERVICE SAFETY I N F O R M A T I O N " on page 2 of ,,:
this manual.
19' REMOTE CONTROL COLOR TELEVISION WITH ON-SCREEN PICTURE CONTROLS
AKB
CCD
AUTOMATIC KlNE BIAS CLOSED CAPTION DECODER
CONTENTS
IMPORTANT SERVICE SAFETY INFORMATION ................... 2 ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL ADJUSTMENTS 1-1. PREPARE THE FOLLOWING MEASUREMENT T O O L S F O R E L E C T R I C A L ADJUSTMENTS .... 3 2. BASiC AOJUSTMENTS 2-1. VIF AND AFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 D 2-2: BRIGHT. AGC. TINT AND COLOR .3. 4 2.3: CUT OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2-4. FOCUS . . 5
2-6.
SPECIFICATIONS
2-5. VERTICAL SIZE . . . . . . . . . . . . . . . . . . . . VERTICAL POSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N 2-7. HORIZONTAL POSITION . . . . . . . . . . . . . . . . . . . .
5
j
5
0+/-3db 6KHz SPEAKER SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1/16" 0.33 oz. Magnet E VOICE COIL IMPEDANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 o h m s at 6 0 z 0H ANTENNA INPUT IMPEDANCE . . . . . . . . . . . ....75 ohm Coaxial input T RECEIVING CH A N NE L S
UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CATV . . . . . . . . . . . .
. 1
.
.
.
. . .
. 14-22 . 23-36 . (AA-FFF) .
. . . Carrier Frequency ................................... 45 .75MHz Sound IF Carrier Frequency ................... . .................. 41 .25MHz y Color S u b Frequency ................................... 42 .17MHz WEIGHT ........................................................................ 3 8 l b s DIMENSIONS ....................... S
3. PURITY AND CONVERGENCE ADJUSTMENT 3-1. STATIC CONVERGENCE ROUGH ADJUSTMENT ... 5 j 3.2: PURITY ............................................................... 5 y 3-3. STATIC CONVERGENCE ....................................... 6 3-4: DYNAMIC CONVERGENCE ................................. 6 . M J R COMPONENTS LOCATION GUIDE ............................ 7 AO E SEMICONDUCTOR BASE CONNECTIONS ............................. 8 S BLOCK DIAGRAM .............................................................. 9 , 4 6 9 PRlNTED CIRCUIT BOARDS M A I N. ...................................................................... 10. , , . CRT/REMOCON ............................................................ . 2 N SCHEMATIC DIAGRAMS TUNER .......................................................................... . 2 R IF/MICON.. ................................................................... . 3 . CHROMA ........................................................................ 14 DEFLECTION .................................................................. . 5 N POWER/AUDIO ............................................................ 1 6 O MECHANICAL EXPLODED V I E W ........................................ . 7 . MECHANlCAL REPLACEMENT PARTS L I S T . . . . . . . . . . . . . . . . . 8 ELECTRlCAL REPLACEMENT PARTS LIST ...... ...-............13. 19
ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL ADJUSTMENTS
Read and perform t h e s e adjustments when repairing the circuits or replacing electrical parts or PCB assemblies. CAUTION Use an isolation transformer when performing any service on lhis chassis. Before removing the anode cap. discharge electricity because it contains high voltage When removing a PCB or related component. alter unfastening or changing a wire. be sure to put the wire back in its original position. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors. use only specified silicon grease (YG6260M). Remove all old silicon before applying new silicon. l-l: Prepare the following measurement tools for electrical adjustments 1. 2. 3. 4. Sweepmarker Generator Oscilloscope Digital Voltmeter Color Bar Generator 1OK ohm 12V
77
AGC TP210 4. Adjust L205 until the waveform marker (45.75MHz) becomes as shown in Fig. 2-l-b.
45.75MHz
1
5, Disconnect output terminal of the sweepmarker generator from TP201. then connect it to TP of the tuner pack. 6. Adjust tuner pack coil until the waveform becomes as shown in Fig. 2-l-c.
2. BASIC
ADJUSTMENTS
41.24MHz
2-1: VIF AND AFT NOTE Connect input and output terminals of the sweepmarket generator to the circuit as shown in Fig. 2-l-a. then adjust it.
SWEEPMARKER GENERATOR OUTPUT
0.022.uF
SWEEPMARKER GENERATOR INPUT 47KohmIN60 ""E TP -60 ,GND
I
Fig. 2-1 a
1. Connect output terminal of the sweepmarker generator to TP201. (Connect a 2.7K ohm resistor between them.) 2. Connect input terminal of the sweepmarker generator t o TP204. 3. Connect a 1OK ohm variable resistor to IF AGC terminal (TP210). 12V line and ground. then adjust to make the waveform of the oscilloscope readable.
7 Disconnect the 10K ohm variable resistor and 2.7K ohm resistor. 8. Disconnect input and output terminals of the sweepmarker generator. 9 Connect the AFT adjustment oscillator (45.75MHzl to TP, of the tuner pack through a 2.7K ohm resistor. 10 Connect the digital voltmeter to TP206. 11 Adjust L 2 0 4 to find the point where the voltage of TP206 changes dramatically. and adjust to 4.5VDC at that point.
2-2: BRIGHT, AGC, TINT AND COLOR
On-Screen Display Adjustment Insert the point o f a straightened paper clip into the hole on, the remote control marked with an arrow as shown in Fig. 2-2. The adjustment mode display will appear as shown in Fig. 2-3.
3
ELECTRICAL
NOTE
Use the 1 - 7 keys on the remote control to Select
ADJUSTMENTS
4. Confirm noise does not appear, 5. Change the channel. confirm other channels are `normal. 2-2-C: TINT
the options show" in Fig. 2-3. Press the 7 key to end the adjustments
1. Receive the color bar patter". 2. Using the remote Control. set the brightness and color to center position. 3. Using the remote control, set the contrast to maxlmum position. 4. Connect the oscilloscope to TPO23. 5. Activate the adjustment mode display and press the 5 key. 6. Press the VOL. UP/DOWN key a" the remote Control until the waveform becomes as show" in Fig. 2-4 I
ADJUSTMENT MODE 1. AGC/BRIGHT/TINT/COLOR AUTO 2. SUB BRIGHT AUTO 3. AGC MANUAL 4. COLOR MANUAL 5. TINT MANUAL 6, BRIGHT MANUAL 7. END
c 2-2-A: BRIGHT
Fig. 2-3 2-2-D: COLOR 1. Receive the color bar patter", 2. Using the remote control, set the brightness and tint to center position. 3. Using the remote control, set the contrast t o m a x i m i m position 4. Connect the oscilloscope to TP022. 5. Activate the adjustment mode display and press the 4 key. 6. Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 5 scales a" the Screen of Ihe oscilloscope. 7. Press the VOL. UP/DOWN key on the remote control until the red color level is set to the 4.75th scale (95%) from while 0%. (Refer to Fig. 2-5)
1. Receive the monochrome pattern 2. Activate the adiustment mode display and press the 6 key. 3. Press the VOL. UP/DOWN key on the remote control until 0% of gray scale will begins to lighten. 2-2-B. AGC NOTE Adjust after performing adjustments in section 2-l In case of weak electric field. 1. Tune to a noisy channel. 2. Activate the adjustment mode display and press the 3 key. 3. Press the VOL. UP/DOWN key a" the remote control until noise is at minimum. 4. Change the channel. confirm other channels are normal. I" case of strong electric field. (Radio frequency interlerence can cause diagonal streaks to appear.) 1. Aclivate the adjustment mode display and press the 3 key. 2. Press the VOL. UP/DOWN key on the remote control until diagonal streaks are at minimum. 3. If there is still a problem after pressing the VOL. UP/DOWN key on the remote control. install an attenuator to the antenna terminals the" repeat step 1. 4
Fig. 2.5
ELECTRICAL
4. Confirm red and blue c o l o r s 5. Adjust the slant of Ihe deflection yoke while
ADJUSTMENTS
watching the screen. then tighten the fixing screw.
WEDGE MAGNET SCRE W
WEDGE
WEDGE (
6 POLE MAGNETS
/ /
- 4 POLE MAGNETS
WEDGE POSITION
Fig. 3-2-b
I
Fig. 3-1
PURITY MAGNETS
3-3: STATIC CONVERGENCE NOTE Adjust after performing adjustmenls in section 3-2. 1. Receive the crosshatch pattern from color bar generator. 2. Combine red and blue of `the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets. 3. Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets. 3-4: DYNAMIC CONVERGENCE NOTE Adjust after performing adjustments in section 3-3. 1. Adjust the differences around the screen by moving the deflection yoke upward/downward and right/left. (Refer to Fig. 3-2-a) 2. Insert three wedges between the deflection yoke and CRT funnel to fix the deflection yoke. (Refer to Fig. 3-2-b)
Fig. 3-2-e
ELECTRICAL ADJUSTMENTS
2-3: CUT OFF 1. Receive the color bar petter". 2. Using the remote control. set brightness and contrast to minimum position. 3. Connect the oscilloscope to ,TPO24. 4. Adjust the screen control until voltage is 150VOC. (Refer to Fig. 2-6) NOTE Lessen the value of R444......Picture will move right. Lessen the value of C460 ,...,.Picture will move left. R444 and C460 are fixed components. Use a variable resistor or capacitor to determine the optimal value and insert that value component.
ON"
2-4: FOCUS 2-5: VERTICAL SIZE
--
jiO"
Fig. 2-f
3. PURITY A N D CONVERGENCE ADJUSTMENT
NOTE 1. Turn the unit on and let it warm up for at least 30 minutes before performing the followiiig adjustments. 2. Place the CRT surface facing east or west to reduce the terrestrial magnetism. 3. Turn ON the unit and demagnetize with a degauss Coil, 3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT 1. Tighten the screw for the magnet. Refer to the adjusted C R T for the position. (Refer t o Fig. 3-1) If the deflection yoke and magnet are in one body, untighten the screw for the body. 2. Receive the green raster patter" from c o l o r bar generator. 3. Slide the deflection yoke until it touches the funnel side o f the CRT. 4. Adjust center of screen to green. with red and blue a" the sides, using the pair of purity magnets. 5. Switch the color bar generator from the green raster patter" to, the crosshatch pattern. 6. Combine red and blue of the 3 color crosshatch Patter" on the center of the screen by adjusting the pair of 4 pole magnets. 7. Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets. 8. Adjust the crosshatch petter" to change to white by repeating steps 6 and 7. 3-2: PURITY NOTE Adjust after; performing adjustments in section 3-1 Receive the green raster petter" from color bar generator. Adjust the pair of purity magnets to center the color on the screen. Adjust the pair of purity magnets so the color at ends are equally wide. Move the deflection yoke backward (to neck side) slowly, and Stop it at the position when the whole screen is green.
1. Receive the broadcasting signal. 2. Adiust the locus control until picture is distinct
1. Receive the crosshatch petter" from the color bar generator. 2. Adjust the bright and contrast controls until the crosshatch patter" is distinct. 3. Adjust VA401 until the center of crosshatch is square. 4. Receive broadcasting signal, the" confirm picture is normal. 2-6: VERTICAL POSITION 1, Receive the color bar patter". 2. Using the remote control. set brightness and Contrast Lo maximum position. 3. Adjust the value of A429 and R430 until horizontal line of the color bar comes to approximate center of the CRT. NOTE Lessen the value of R430......Picture will move about 5mm UP. Lessen the value of R429.....Picture will move about 5mm DOWN. R429 and R430 are fixed resistors. Use a variable resistor to determine the optimal value and insert that value resistor. 2 - 7 : HORIZONTAL POSITION Receive the color bar patter". Using the remote control. set brightness and contrast to maximum position. Adjust the value of R444 and C460 until the color width of both screen edges are equal. Receive the broadcasting signal, the" confirm picture is normal.