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SERVICE MANUAL
COLOUR TELEVISION
EXK-LA76818
MC8907
(DRAFT)
CONTENTS
SPECIFICATIONS ..................................................................................................... 2
SAFETY PRECAUTIONS ............................................................................................ 3
SERVICE ADJUSTMENTS
1
.
SPECIFICATIONS
Item Specifications
TV RF System B/GŁ¬ and DK I or M will be option.
Colour System TV Mode PAL SECAM will be option.
Video Mode PAL SECAM NTSC will be option.
Receiving Frequency VHF (VL) 46.25 MHz to 168.25 MHz
VHF (VH) 175.25 MHz to 463.25 MHz
UHF 471.25 MHz to 863.25 MHz
CATV Yes
Intermediate VIF Carrier 38.9 MHz
Frequency SIF Carrier 33.4 MHz
Colour Sub Carrier Frequency PAL /SECAM(4.43 MHz),
Aerial Input Terminal 75 Ohm Unbalanced
Power Input Rated Voltage 220 V AC, 50/60 Hz
Input AV Video 1 Vpp, 75 Ohm, RCA
Audio 500 mVrms (-4dBs), High impedance, RCA
S-VHS Y 1 Vpp, 75 Ohm, 4-pin S connector
YUV Y 1 Vpp, 75 Ohm, RCA
CrCb 0.7 Vpp, 75 Ohm, RCA
Output Video 1 Vpp, 75 Ohm, RCA
Audio 500mVrms (-4dBs), Low impedance, RCA
Headphone jack NONE
Remote Control Unit RE-001 (Battery size: AA/R03/UM-4 x 2)
Design & specifications are subject to change without notice.
2
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SAFETY PRECAUTIONS
1. The design of this product contains special hardware, many 9. Isolation Check
circuits and components specially for safety purposes. For (Safety for Electrical Shock Hazard)
continued protection, no changes should be made to the After re-assembling the product, always perform an isolation
original design unless authorized in writing by the check on the exposed metal parts of the cabinet (antenna
manufacturer. Replacement parts must be identical to those terminals, video/audio input and output terminals, Control
used in the original circuits. Service should be performed by knobs, metal cabinet, screwheads, earphone jack, control
qualified personnel only. shafts, etc.) to be sure the product is safe to operate without
danger of electrical shock.
2. Alterations of the design or circuitry of the products should (1) Dielectric Strength Test
not be made. Any design alterations or additions will void The isolation between the AC primary circuit and all metal
the manufacturer's warranty and will further relieve the parts exposed to the user, particularly any exposed metal
manufacturer of responsibility for personal injury or property part having a return path to the chassis should withstand a
damage resulting therefrom. voltage of 3000V AC (r.m.s.) for a period of one second.
(...Withstand a voltage of 1100V AC (r.m.s.) to an appliance
3. Many electrical and mechanical parts in the products have rated up to 120V, and 3000V AC (r.m.s.) to an appliance
special safety-related characteristics. These characteristics rated 200V or more, for a periode of one second.)
are often not evident from visual inspection nor can the This method of test requires a test equipment not generally
protection afforded by them necessarily be obtained by found in the service trade.
using replacement components rated for higher voltage, (2) Leakage Current Check
wattage, etc. Replacement parts which have these special Plug the AC line cord directly into the AC outlet (do not use
safety characteristics are identified in the parts list of a line isolation transformer during this check.). Using a
Service manual. Electrical components having such "Leakage Current Tester", measure the leakage current
features are identified by shading on the schematics from each exposed metal part of the cabinet, particularly
and by ( ) on the parts list in Service manual. The use any exposed metal part having a return path to the chassis,
of a substitute replacement which does not have the same to a known good earth ground (water pipe, etc.). Any
safety characteristics as the recommended replacement leakage current must not exceed 0.5mA AC (r.m.s.).
part shown in the parts list of Service manual may cause However, in tropical area, this must not exceed 0.2mA AC
shock, fire, or other hazards (r.m.s.).
Alternate Check Method
4. Don't short between the LIVE side ground and Plug the AC line cord directly into the AC outlet ( do not use
ISOLATED (NEUTRAL) side ground or EARTH side a line isolation transformer during this check.). Use an AC
ground when repairing. Some model's power circuit is voltmeter having 1000 ohms per volt or more sensitivity in
partly different in the GND. The difference of the GND is the following manner. Connect a 1500 10W resistor
shown by the LIVE: ( ) side GND, ISOLATED (NEUTRAL) : paralleled by a 0.15F AC-type capacitor between an
( ) side GND and EARTH : ( ) side GND. Don't short exposed metal part and a known good earth ground (water
between the LIVE side GND and ISOLATED (NEUTRAL) pipe, etc.). Measure the AC voltage across the resistor with
side GND or EARTH side GND and never measure with a the AC voltmeter. Move the resistor connection to each
measuring apparatus (oscilloscope etc.) the LIVE side GND exposed metal part, particularly any exposed metal part
and ISOLATED (NEUTRAL) side GND or EARTH side GND having a return path to the chassis, and measure the AC
at the same time. If above note will not be kept, a fuse or voltage across the resistor. Now, reverse the plug in the AC
any parts will be broken. outlet and repeat each measurement. Any voltage
measured must not exceed 0.75V AC (r.m.s.). This
5. If any repair has been made to the chassis, it is corresponds to 0.5mA AC (r.m.s.).
recommended that the B1 setting should be checked or However, in tropical area, this must not exceed 0.3V AC
adjusted (See ADJUSTMENT OF B1 POWER SUPPLY). (r.m.s.).
This corresponds to 0.2mA AC (r.m.s.)
6. The high voltage applied to the picture tube must conform
with that specified in Service manual. Excessive high
voltage can cause an increase in X-Ray emission, arcing
and possible component damage, therefore operation under
excessive high voltage conditions should be kept to a
minimum, or should be prevented. If severe arcing occurs,
remove the AC power immediately and determine the cause
by visual inspection (incorrect installation, cracked or melted
high voltage harness, poor soldering, etc.). To maintain the
proper minimum level of soft X-Ray emission, components
in the high voltage circuitry including the picture tube must
be the exact replacements or alternatives approved by the
manufacturer of the complete product.
7. Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting the other end of the lead through a 10k
2W resitor to the anode button.
8. When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
3
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REPLACEMENT OF MEMORY IC
1. MEMORY IC.
This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and
deflection circuits.
When replacing memory IC, be sure to use IC written with the initial value of data.
2. PROCEDURE FOR REPLACING MEMORY IC
(1) Power off
Switch the power off and unplug the power cord from AC outlet.
(2) Replace IC
Be sure to use memory IC written with the initial data values.
(3) Power On
Plug the power cord into the AC outlet and switch the power On.
(4) Check and set SYSTEM default value:
1) Press "TEST" key on the special service use factory Remote control unit.
2) The "TEST" will be displayed on the screen.
3) Press "0" to "2" key, (Mkey) and corresponding on-screen display will be appeared.
4) After pressed "SCAN" key, Press "3" to "9" key, (Mkey) and corresponding on-screen display will
be appeared.
5) In this section, except "0", "1" and "2" key function would be confirmed.
6) Check the setting value of the SYSTEM default value of Table 1. If the value is different, select
items by [CH+]/[CH-] keys and set value by [VOL+]/[VOL-] keys.
7) Press "TEST" key again and return to the normal screen.
4
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Table 1 Settings for SYSTEM DEFAULT
Mkey ITEM SETTINGS DEFAULT
3 IF 38M/38.9M/45.75M/58.75M 38.9M
PAL ON OFF ON
NTSC3.58 ON OFF ON
NTSC4.43 ON OFF ON
SECAM ON OFF OFF
6.5M ON OFF ON
6..0M ON OFF OFF
5.5M ON OFF ON
4.5M ON OFF OFF
SIF-PRIORITY 6.5M6.0M5.5M4.5M 5.5M
4 AV2 ON OFF ON
S-VHS ON OFF ON
YUV ON OFF ON
LOGO SW ON OFF OFF
LOGO POS 0 4 2
LOGO COLOR 0 7 7
START ON ON OFF OFF(standby)
BAND MODE 0 1 1(BUS TUNER)
CURTAIN 0 3 0(NON curtain)
POWER MUTE 0 7 2
5 OSD CONT 0 127 24
DIGITAL OSD ON OFF ON
BRI ABL TH 0 7 6
BRI ABL ON OFF OFF
BRI ABL MID ON OFF OFF
RGB TEMP ON OFF OFF
ARABIC ON OFF ON
RUSIAN ON OFF ON
FRENCE ON OFF ON
6 H BLK L 0 7 4
H BLK R 0 7 4
V COMP 0 7 4
P/O SELECT ON OFF ON
P/O ADJ 0 3 1
R/B BALANCE 0 15 7
R/B ANGLE 0 15 7
G-Y ANGLE 0 15 7
B-Y PAL 0 15 9
5
.
R-Y PAL 0 15 9
7 MODE STANDARDSOFTSHARPFACTORY STANDARD
BRIGHT 0 63 48
CONT 0 63 48
COLOR 0 63 32
SHARP 0 63 32
TEST SIGNAL 0 3 0
C/VCO SW ON OFF OFF
C/VOC ADJ 0 3 3
VERSET TIMING ON OFF OFF
H LOCK VDET ON OFF ON
8 WPL OPE 0 3 2
Y gamma 0 3 2
Coring 0 3 1
Blk str star 0 3 2
Blk str 0 3 2
DC rest 0 3 2
AUTO flesh ON OFF ON
Local powre ON OFF Off
VOL select ON OFF ON
9 VIDEO LEVEL 0 7 4
SUB CONT 0 127 127
SUB COLOR 0 127 127
SUB SHARPNESS 0 63 32
SUB TINT 0 127 63
OVER MOD SW ON OFF Off
OVER MOD 0 15 8
HALF TONE 0 3 0
6
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SERVICE ADJUSTMENT
B1 POWER SUPPLY
1. Receive normal colour pattern signal.
2. Connect DC voltmeter to VD631( or jump wire W261) and isolated ground.
3. Adjust VR631 to get the voltage as 110V ±1.0V (for 21inch) or 130V ±1.0V (for 25/29 inch)
FOCUS ADJUSTMENT
1. Receive a crosshatch signal.
2. While watching the screen, adjust the FOCUS VR to make the vertical and horizontal lines as fine and
sharp as possible.
BUS CONTROL ADJUSTMENT
To enter BUS control mode, use special remote control with "TEST" key, and push "TEST" key. On TV
screen "TEST" will be indicated, this means entered bus control mode.
And following key press, each function will be available.
Remote Hand Unit keys
[M1] [M2]
[M0]
MENU0
V . POSI 49
[M0] menu V . SIZE 24
V . LINE 12
V . SC 0
MENU0 Geometrical adjustment H -PHASE 10
Receive standard Crosshatch pattern signal. OSD.H 37
Adjustment steps:
a) Adjust V.POSI value, to picture center and CRT screen center would be coincided, vertically.
b) Adjust V.SIZE value, to vertical size to be adequate.
c) Adjust V.LINE value, to upper square and lower square height would be coincided.
d) Adjust V.SC value, to upper, lower and center squares height would be coincided.
e) Adjust H-PHASE value, to picture center and CRT screen center would be coincided, horizontally.
f) Adjust OSD H value, to place OSD bar with left and right to be balanced.
7
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[M1] menu MENU1
RF-AGC 40
MENU1 RF AGC adjustment B-Y DC LEVEL 7
Receive 60dB(1mV)VH colour pattern signal, R-Y DC LEVEL 7
SHIPPING
adjust AGC value(voltage from high to low),
to noise reduce gradually and just disappeared point.
MENU2
[M2] menu BR 50
CN 50
* MENU2 Screen control, White balance and sub-brightness adjustment SC
RB 50
· When entering MENU2 adjustment, CPU will set "PICTURE" GB 50
BB 50
to "FACTORY" mode and "Picture Enhancement" to "OFF" RD 60
automatically. GD 12
BD 60
SB 60
Receive gray and white 2 steps signal.
a) Confirm BR(BRIGHNESS) value, SB(Sub-Brightness) and CN(CONTRAST) value, with initial value.
Remote Hand Unit keys
- RB +
In this mode, keys on Remote Unit works as left.
- GB +
BB +
- BB
b) Press V+ on SC, adjust SCREEN control on Flyback transformer to get the darkest single horizontal line
(red, green, or blue, sometimes shows more yellow, more purple or more white).
Using (above) 1,2,5,6,9,0 keys, to get one white horizontal bar. Then re-adjust SCREEN control to get
horizontal bar would be just visible.
c) Press [CH+]/[CH-] key and back to normal screen, and confirm the dark area white balance would be
adjusted adequately.
d) Select to RD, GD and/or BD, adjust RD, GD and BD value, to get brighter area white balance would be
adequate.
e) Repeat b) and d) steps, such that both gray and white area color temperature become adequate.
g) Receive black and white 8 steps signal, re-adjust SB (SUB-BRIGHNESS) value such that No.1 (the most
black) and No. 2 step (the 2nd darkest) just distinguish brightness difference.
8
.
I2C bus control adjustment item default setting
Mn Item Scope Default Remarks Mn Item Scope Default Remarks
setting setting
M0 V. POSI 0·` 63 54 M2 BR 0·` 63 50
M0 V. SIZE 0·` 127 50 M2 CN 0·` 127 50
M0 V. LINE 0·` 31 12 M2 SC 0·` 127 0
M0 V.SC 0·` 31 15 M2 RB 0·` 255 50
M0 H-PHASE 0·` 31 11 M2 GB 0·` 255 50
M0 OSD. H 0·` 63 25 M2 BB 0·` 255 50
M2 RD 0·` 127 60
M1 RF AGC 0·` 63 40 M2 GD 0·` 15 12
B-Y DC LEVEL 0·` 15 7 M2 BD 0·` 127 60
B-Y DC LEVEL 0·` 15 7 M2 SB 0·` 127 60
SHIPPING
9
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ICs functional description
N801 MC8907 function:Microcomputer
NAME PIN FUNCTION NAME PIN FUNCTION
BAND1 1 BAND output AV1/AV2 36 TV/AV1/AV2 control output
BAND2 2 BAND output TV/AV 35 TV/AV1/AV2 control output
2 2
I C SDA 3 I C Bus (Data) --- 34 Not used
2 2
I C SCL 4 I C Bus (Clock) --- 33 Not used
GND 5 Ground TUNING 32 Tuning Voltage PWM out
X in 6 32KHz X'tal connection VOLUME 31 Volume control
X out 7 32KHz X'tal connection MUTE 30 MUTE output
VDD 8 Vdd 5V --- 29 Not used
KEY1 9 Control keys input IR-IN 28 Remote control signal input
AFT in 10 AFT Voltage input SD 27 Signal detection input
POWER TEST 11 Power test signal input --- 26 Not used
--- 12 Not used --- 25 Not used
RESET 13 Reset --- 24 Not used
FILT 14 Filter SECAM 23 SECAM system control
output
SAFTY 15 X-RAY protection input OSD BLANK 22 Fast blanking pluse output
POWER 16 STAND BY output B OUT 21 Blue on screen display
V.SYN 17 Vertical Sync.pulse input G OUT 20 Green on screen display
H.SYN 18 Hor. Sync.pulse input R OUT 19 Red on screen display
MC8907 pins description:
· Pin No.1 and No.2 : Tuner band selection output.
· Pin No.3: I2C BUS port0 data line (SDA1)
· Pin No.4: I2C BUS port0 clock line(SCL1)
· Pin No.5: Ground
· Pin No.6 and 7: 32Khz X'tal oscillator connection.
· Pin No.8: VDD(5V)
· Pin No.9: Control key input (Analog to Digital Convertor)
(Max. Limit voltage)
FUNCTION P+ P- V+ V- TV/AV MENU POWER
VOLTAGE 0 1 1.4 2.0 2.7 3.1 3.75
· Pin No.10: AFT Voltage input.
· Pin No.11: POWER test Voltage input.
· Pin No.13: Reset. Low to High: Reset
· Pin No.14: Filter.
· Pin No.15: X-RAY protection input, High-Voltage protection input.
· Pin No.16: STAND BY output.
In STAND BY mode low level. In normal operation, High level.
· Pin No.17: Verttical Sync. pulse input.
· Pin No.18: Horizontal Sync. pulse input.
10
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· Pin No.19, 20,21: R, G, B On screen display and blue back signal output.
· Pin No.22: Fast blanking for on screen display pulse output.
· Pin No.27: Signal detection input.
Note: Without this pin's input TV will go enter Standby mode after 10 minutes. (Auto-power Off) But this function
does not work in AV mode.
· Pin No.28 Remote control signal input.
· Pin No.30 Sound MUTE output.
Normally in low level. Forced MUTE or CH change, TV/AV and in no-signal
condition, High level output.
Note: Without SD (Pin 27) input (No reception signal), mute will output automatically in TV mode, but in AV
mode this will not work.
· Pin No.31: Volume control.
· Pin No.32: Tuning voltage (Vt) PWM output.
· Pin No.35 and No.36: TV/AV1/AV2 output.
11
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N201 LA76818 Function: I2C bus controled PAL/NTSC one chip processor
Symbol PIN Function Symbol PIN Function
AUDIO OUT 1 Audio output FBP IN 28 FBP input
FM OUT 2 FM output VCD I REF 29 VCD current ref
PIF AGC 3 PIF AGC CLOCK OUT 30 4MHz clock output
RF AGC OUT 4 RF AGC VCC(CCD) 31 Power(1H-DL)
PIF IN 5 PIF input CCD FIL 32 Delay circuit filter
PIF IN 6 PIF input GND(CCD/H) 33 Ground (IH-DL)
GND( IF ) 7 Ground(IF) SECAM B-Y IN 34 SECAM B-Y input
OR Cb input
VCC(VIF) 8 Power (IF) SECAM R-Y IN 35 SECAM R-Y output
OR Cr input
FM FIL 9 FM Filter APC2 FIL 36 Color AFC2
AFT OUT 10 AFT output FSC OUT 37 SECAM connection
BUS DATA 11 Bus data XIAL 38 Crystal oscillation
BUS CLOCK 12 Bus clock APC1 FIL 39 Color AFC1
ABL 13 ABL INPUT SELECT V OUT 40 Selected Video output
R IN 14 Red input GND(V/C/D) 41 Ground(video/color
/deflection)
G IN 15 Green input EXT V IN 42 Ext. video input
B IN 16 Blue input VCC(V/C/D) 43 Power(video/color/
deflection)
BL IN 17 BL input INT V IN 44 Int. Video input
VCC(RGB) 18 Power(RGB) BLACK STR 45 Black stretch
R OUT 19 Red output VIDEO OUT 46 Video output
G OUT 20 Green output APC FIL 47 APC Filter
B OUT 21 Blue output VCO COIL 48 VCO Coil
SYNC 22 Sync signal output VCO COIL 49 VCO Coil
V OUT 23 Vertical output VCO FIL 50 VCO Filter
RAMP FIL 24 Ramp Filter EXT AUDIO IN 51 Ext. audio input
VCC(H/D) 25 Power(vertical SIF OUT 52 SIF output
deflection / bus
control)
H APC FIL 26 Horizontal AFC SIF APC FIL 53 SIF APC filter
filter
H OUT 27 Horizontal SIF IN 54 SIF input
deflection output
12
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N131 AN7523//7522 Function : audio output
Symbol PIN Function Symbol PIN Function description
description
Vcc 1 Power supply GND 7 ground
Out 1 (+) 2 Ch 1 output (+) In 2 8 Ch 2 input
GND(out 1) 3 Ch 1Ground VOL 9 Volume Control
Out 1 (-) 4 Ch 1 output (-) Out 2 (-) 10 Ch 2 output (-)
Standby 5 Mute input GND(out 2) 11 Ch 2 Ground
In 1 6 Ch 1 input Out 2 (+) 12 Ch 2 output (+)
Note: AN7523 is pin 1 to 9, AN7522 is pin 1 to 12.
N501 LA78040 //LA78045 Function : vertical output
Symbol PIN Function Symbol PIN Function description
description
INV IN 1 Input V OUT 5 Vertical scan output
VCC1 2 Power VCC2 6 Output power supply
PUMP UP 3 Pump up power NON INV IN 7 Negative feedback
GND 4 Ground
13
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. Wave forms
5V P-P 5V P-P 2V P-P 1V P-P 1V P-P
H V H H H
N801 PIN18 N801 PIN17 N201 PIN46 N201 PIN44 N201 PIN42
3V P-P 3V P-P 3V P-P 2V P-P 5V P-P
H H H H H
N201 PIN21 N201 PIN20 N201 PIN19 N201 PIN40 N201 PIN27
5V P-P 1V P-P 0.5V P-P 1V P-P 12V P-P
H V V
N201 PIN28 N201 PIN23 N801 PIN6 N201 PIN1 N501 PIN1
48V P-P 30V P-P 3V P-P 1000V P-P
V H H H
N501 PIN5 V431 C V432 B V432 C
75V P-P 75V P-P 75V P-P 24V P-P 275V P-P
H H H H H
V902 C V903 C V901 C HEATER T511 PIN7
All IC/Transistors voltages
N801 MC8907
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14
V 4 4 0 1.9 2.5 5 5 2.7 1.8 0 5 3.2
PIN 15 16 17 18 19 20 21 22 23 24 25 26 27 28
V 5 0.4 5 4 0 0.2 0.2 0.5 0 0 0 4.6 0.7 4.7
PIN 29 30 31 32 33 34 35 36
V 0 0 0/5 0/5 0/5 0/5 0/5 0/5
14
.
N201 LA76818
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14
V 2.3 2.3 0 3.7 2.9 2.9 0 5 2 2.3 4.7 4.7 4 0.8
PIN 15 16 17 18 19 20 21 22 23 24 25 26 27 28
V 0.8 1.1 0 8 2 2 2 0.4 2.2 2.7 5 2.6 0.7 1
PIN 29 30 31 32 33 34 35 36 37 38 39 40 41 42
V 1.6 1.3 5 8.8 0 2.6 2.1 3.9 2.4 2.9 3.6 2.5 0 2.6
PIN 43 44 45 46 47 48 49 50 51 52 53 54
V 2.5 2.8 1.9 2.2 3.6 4 4 2.4 2.2 1.9 2.2 3
N131 TDA7522
PIN 1 2 3 4 5 6 7 8 9 10 11 12
V 12 7 0 7 3.3 1.4 0 1.4 0 7 0 7
N501 LA78040
PIN 1 2 3 4 5 6 7
V 2.5 27 2 0 11.3 27 2.5
VD615 PC817
PIN 1 2 3 4
V 32 31 0.4 14.5
15
.
Transistors voltages
V151 V152 V431
B C E B C E B C E
8.9 0.2 8.8 0.2 3.7 0 0.2 20 0
V432 V449 V631
B C E B C E B C E
2 110 2.3 0 4.8 0 6 31 6
V682A V682 V683
B C E B C E B C E
0.6 0.3 0 0.7 0.3 0 26 27 27
V684 V801 V802
B C E B C E B C E
11 11.7 11.8 4.2 4.9 5 0.4 4 0
V803 V810 V901
B C E B C E B C E
0.3 5 0 0.5 0~27 0 2 132 1.8
V902 V903 V941
B C E B C E B C E
2 132 1.8 2 132 1.8 0.1 0 0.1
16
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PURITY / CONVERGENCE ADJUSTMENT
PURITY ADJUSTMENT
WEDGE
1. Demagnetize CRT with the demagnetizer.
DEFLECTION YOKE
2. Loosen the retainer screw of the deflection yoke.
P
3. Remove the wedges.
CRT
4. Input a green raster signal from the signal generator,
and turn the screen to green raster. 4 6
5. Move the deflection yoke backward.
P/C MAGNETS
6. Bring the long lug of the purity magnets on the short
lug and position them horizontally. (Fig2) P: PURITY MAGNET
4: 4-POLES (convergence magnets)
7. Adjust the gap between two lugs so that the GREEN
RASTER will come into the center of the screen. 6: 6-POLES (convergence magnets)
(Fig. 3)
Fig. 1
8. Move the deflection yoke forward, and fix the position
of the deflection yoke so that the whole screen will
become green.
PURITY MAGNETS
9. Insert the wedge to the top side of the deflection
yoke so that it will not move.
Long lug
10. Imput a crosshatch signal.
11. Verify that the screen is horizontal.
12. Input red and blue raster signals, and make sure that Short lug
purity is properly adjusted.
Bring the long lug over the short lug
and position them horizontally.
Fig. 2
(FRONT VIEW)
GREEN RASTER
CENTER
Fig. 3
17
.
STATIC CONVERGENCE ADJUSTMENT
1. Input a crosshatch signal.
2. Using 4-pole convergence magnets, overlap the red
and blue lines in the center of the screen (Fig. 1) and
turn them to magenta (red/blue).
(FRONT VIEW)
3. Using 6-pole convergence magnets, overlap the
magenta (red/blue) and green lines in the center of the
screen and turn them to white.
4. Repeat 2 and 3 above, and make the best
convergence.
Fig. 1
(FRONT VIEW)
DYNAMIC CONVERGENCE ADJUSTMENT
RED GREEN BLUE
1. Move the deflection yoke up and down and overlap
lines in the periphery. (Fig. 2) BLUE
2. Move the deflection yoke left to right and overlap the RED
lines in the periphery. (Fig. 3) GREEN GREEN
RED BLUE
3. Repeat 1 and 2 above, and make the best
convergence.
BLUE GREEN RED
Fig.2
(FRONT VIEW)
After adjustment, fix the wedge at the original position. RED GREEN BLUE BLUE GREEN RED
Fasten the retainer screw of the deflection yoke.
RED
Fix the 6 magnets with glue.
GREEN
BLUE
BLUE
GREEN
RED
Fig. 3
18