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UOC TDA9361/81 SERIES
SERVICE MANUAL
COLOUR TELEVISION
.
CONTENTS
1. safety precautions...................................................................................................3
2. block diagram
and PHILIPS UOC functional difference between the various IC versions ......................4
3£® Replacement of memory IC.......................................................................................7
4£® Service adjustment...................................................................................................7
5£® ICs functional description..........................................................................................11
6£® Test point waveform.................................................................................................15
7£® All ICs/transistors voltages........................................................................................16
8£® Purity / convergence adjustment................................................................................17
2
.
SAFETY PRECAUTIONS
1. The design of this product contains special hardware, many 10. 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 11. The surface of the TV screen is coated with a thin film which
not be made. Any design alterations or additions will void can easily be damaged. Be very careful with it when handle
the manufacturer's warranty and will further relieve the the TV. Should the TV screen become soiled, wipe it with a
manufacturer of responsibility for personal injury or property soft dry cloth. Never rub it forcefully. Never use any cleaner
damage resulting therefrom. or detergent on it.
3. Many electrical and mechanical parts in the products have (1) Dielectric Strength Test
special safety-related characteristics. These characteristics The isolation between the AC primary circuit and all metal
are often not evident from visual inspection nor can the parts exposed to the user, particularly any exposed metal
protection afforded by them necessarily be obtained by part having a return path to the chassis should withstand a
using replacement components rated for higher voltage, voltage of 3000V AC (r.m.s.) for a period of one second.
wattage, etc. Replacement parts which have these special (...Withstand a voltage of 1100V AC (r.m.s.) to an appliance
safety characteristics are identified in the parts list of rated up to 120V, and 3000V AC (r.m.s.) to an appliance
Service manual. Electrical components having such rated 200V or more, for a periode of one second.)
features are identified by shading on the schematics This method of test requires a test equipment not generally
and by ( £¡ ) on the parts list in Service manual. The use found in the service trade.
of a substitute replacement which does not have the same (2) Leakage Current Check
safety characteristics as the recommended replacement Plug the AC line cord directly into the AC outlet (do not use
part shown in the parts list of Service manual may cause a line isolation transformer during this check.). Using a
shock, fire, or other hazards "Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
4. Don't short between the LIVE side ground and any exposed metal part having a return path to the chassis,
ISOLATED (NEUTRAL) side ground or EARTH side to a known good earth ground (water pipe, etc.). Any
ground when repairing. Some model's power circuit is leakage current must not exceed 0.5mA AC (r.m.s.).
partly different in the GND. The difference of the GND is However, in tropical area, this must not exceed 0.2mA AC
shown by the LIVE: ( ) side GND, ISOLATED (NEUTRAL) : (r.m.s.).
( ) side GND and EARTH : ( ) side GND. Don't short Alternate Check Method
between the LIVE side GND and ISOLATED (NEUTRAL) Plug the AC line cord directly into the AC outlet ( do not use
side GND or EARTH side GND and never measure with a a line isolation transformer during this check.). Use an AC
measuring apparatus (oscilloscope etc.) the LIVE side GND voltmeter having 1000 ohms per volt or more sensitivity in
and ISOLATED (NEUTRAL) side GND or EARTH side GND the following manner. Connect a 1500 ¦¸ 10W resistor
at the same time. If above note will not be kept, a fuse or paralleled by a 0.15 ¦Ì F AC-type capacitor between an
any parts will be broken. exposed metal part and a known good earth ground (water
pipe, etc.). Measure the AC voltage across the resistor with
5. If any repair has been made to the chassis, it is the AC voltmeter. Move the resistor connection to each
recommended that the B1 setting should be checked or exposed metal part, particularly any exposed metal part
adjusted (See ADJUSTMENT OF B1 POWER SUPPLY). having a return path to the chassis, and measure the AC
voltage across the resistor. Now, reverse the plug in the AC
6. The high voltage applied to the picture tube must conform outlet and repeat each measurement. Any voltage
with that specified in Service manual. Excessive high measured must not exceed 0.75V AC (r.m.s.). This
voltage can cause an increase in X-Ray emission, arcing corresponds to 0.5mA AC (r.m.s.).
and possible component damage, therefore operation under However, in tropical area, this must not exceed 0.3V AC
excessive high voltage conditions should be kept to a (r.m.s.).
minimum, or should be prevented. If severe arcing occurs, This corresponds to 0.2mA AC (r.m.s.)
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
9. manufacturer's replacement components.
3
.
2 TV Block diagram for PAL/SECAM
TDA9361
video
Vo
TUNER SAW IF IN Y IN Y
V2i
RF AGC V IN Cr 4052 video
BAND1 V1i
BAND2 U IN Cb
CVBSINT video Y
video CHROMA S-VHS
S
TRAP IFVO OUT video C
CVBS/Y IN
ARo
24C04 audio
ALo
SDA NICAM ARi2
bus
SCL TDA9874 ARi1
AUDIO OUT IK
A OUTR
A OUTL
AV2 R
AV2 R
SDA/SCL
M OUTR
M OUTL
RGB OUT XS303
MAIN R
MAIN L
TDA9859
AV1 L
AV2 L
V OUT H OUT
7
4
5
1
2
6
7
8
ALi2
bus 5V
audio ALi1
audio
AN7522
CRT PCB Vi1
V IN H IN 200V OUT1-
130V audio OUT1+
CD8145 +15V
24V TDA8351 H OUT
POWER -15V Vi2
16V EW SCREEN CRT
V OUT H OUT OUT2-
8V
UNIT OUT2+
5V FOCUS
3.3V
DY
4
.
PHILIPS UOC FUNCTIONAL DIFFERENCE BETWEEN THE VARIOUS IC VERSIONS
IC VERSION 9350 9351 9352 9353 9360 9361 9362 9363 9364 9365 9366 9367 9380 9381 9382 9383 9384 9385 9386 9387 9388 9389 9370 9373 9375 9377 9378
TV rang 90 90 90 110 90 90 110 110 110 110 90 90 90 90 90 110 110 110 110 90 110 110 90 110 110 90 110
Mono inter-carrier multi-standard
Sound demodulator (4.5-6.5MHz)
With switch able centre frequency
Audio switch
Automatic volume leveling
Automatic volume leveling or
Subcarrier output (for comb filter
applications)
QSS sound IF amplifier with
Separate input and AGC circuit
AM sound demodulator without
Extra reference circuit
PAL decoder
SECAM decoder
NTSC decoder
Horizontal geometry(E-W)
Horizontal and vertical zoom
ROM size 32- 32- 32- 32- 64- 64- 64- 64- 64- 64- 64- 64- 16- 16- 16- 16- 16- 16- 16- 16- 16- 16- 32- 32- 32- 32- 32-
64k 64k 64k 64k 128 128 128 128 128 128 128 128 64k 64k 64k 64k 64k 64k 64k 64k 64k 64k 55k 55k 55k 55k 55k
User RAM size 1k 1k 1k 1k 2k 2k 2k 2k 2k 2k 2k 2k 1k 1k 1k 1k 1k 1k 1k 1k 1k 1k 2.25 2.25 2.25 2.25 2.25
Teletext 1p 1p 1p 1p 10p 10p 10p 10p 10p 10p 10p 10p
Closed captioning
5
.
Block diagram TDA93xX PS/N2 series with mono intercarrier sound demodulator
6
3.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 "QV" key holding about 4 second and then press "MENU1" key on the Remote control unit.
Or Press "TEST" key on the Remote control unit for factory used.
2) The "TEST" will be displayed on the screen.
3) Press digital key, (Mkey) and corresponding on-screen display will be appeared.
Some time "PASSWORD" on-screen display will be appeared, you need to input 828.
4) Check the setting value of the SYSTEM default value of Table below. If the value is different,
select items by [CH+]/[CH-] keys and set value by [VOL+]/[VOL-] keys.
5) Press "STANDBY" key again and return to the normal screen.
4.SERVICE ADJUSTMENT
B1 POWER SUPPLY
1. Receive normal colour bar signal.
2. Connect DC voltmeter to VD541- and isolated ground.
3. Adjust potentiometer in power unit to get the voltage as 110V ±1.0V for 21 inch hereinafter,
130 ±1.0V for 25 inch upwards.
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.
EW ADJUSTMENT(only upper 25 inch)
1. adjust VR433 for horizontal size, to get 90% of horizontal picture contents would be displayed on CRT.
2. adjust VR432 for EW parabola, to straighten the vertical at the sides.
3. adjust VR431 for EW trapezium, to set the line at the sides vertical.
7
BUS CONTROL ADJUSTMENT
To enter BUS control mode, Press "TEST" key on the Remote control unit of factory.
Press "0" to "9" key, (Mkey) and corresponding on-screen display will be appeared.
On TV screen "TEST" will be indicated, this means entered bus control mode.
And press following key, each function will be available.
Remote Hand Unit keys
[M1] [M2] [M3]
[M0] MENU8
V SLOPE 31
V SHIFT 31
V AMP 31
V SCOR 31
H SHIFT 31
[M8] menu
MENU0 Geometrical adjustment
Receive PAL standard Complete pattern signal.
Adjustment steps£º
a) Adjust V. SLOPE, to the center horizontal line just appeare from half bottom shadow.
b) Adjust V. SIZE, to get 90% of vertical picture contents would be displayed on CRT.
c) Adjust V. SHIFT, the center horizontal line correspond to CRT vertical center.
d) Adjust H.SHIFT, to get the picture horizontal center correspond to CRT horizontal center.
Receive NTSC signal and repeat above [M0] and [M1] adjustment.
[M7] Menu
AGC Adjustment.
Receive 60dB¦Ì (1mV)VH colour bar pattern signal£¬ adjust AGC value£¨ voltage from high to low£©£¬ to
noise reduce gradually and just disappeared point.
[M9] Menu
CRTcut off and white balance adjustment.
Receive white signal.
a) CRT cut off adjustment.
1. Select "SC", then automatically vertical scan will be stopped.
2. 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).
b) White balance adjustment.
1. Select RD/BD menu.
2. Adjust RD/BD to get colour temperature as x=281, y=311
c) Sub-Brightness adjustment. (Use stair case signal)
1. Select SB menu.
2. Adjust SB to get the darkest step being cutoff.
8
ICs Default Settings
a) TDA9381(1.0) EK cord=NTDA9381-----NG
MI Items Variable Preset MI Items Variable Preset
M0 AVL ON/OFF ON M4 SUBCON 0~63 63
FSL ON/OFF ON SUBCOL 0~63 63
FMWS ON/OFF OFF SUBSHP 0~63 63
FFI ON/OFF OFF SUBTINT 0~15 15
OSO ON/OFF ON YDLY PAL 0~15 12
FCO ON/OFF OFF YDLY NTSC 0~15 12
WOOFER ON/OFF OFF YDLY SEC 0~15 12
DUAL OUT 0~1 0 YDLY AV 0~15 12
Volume mode 0~1 1 UOC VOL ON/OFF Off
CATHODE 0~15 15
M1 BAND 0~2 2 SC BRI 0~63 10
AV CFG* 0~8 3
NTSC MX USA M5 OSD VPOS 0~63 53
VIDEO OUT CVBS OSD HPOS 0~59 15
PIN5 NTSC WIDE 0~63 15
PRO 0~3 0 ZOOM 0~63 59
NENU TITLE 0~6 3
M2 VISION IF 38.9M E2PROM ADRESS 0~33
DK ON/OFF OFF E2PROM VALUE 0~95
BG ON/OFF ON E2PROM WRITE
I ON/OFF OFF
M ON/OFF OFF M8 FREQUENCY 50HZ 60HZ
SIF PREFER BG VSLOPE 0~63 31 31
AUTO SOUND ON/OFF ON VSHIFT 0~63 31 31
VAMP 0~63 31 31
M3 START ON 0~2 0 VSCOR 0~63 31 31
ENGLISH ON/OFF ON HSHIFT 0~63 31 31
ARABIC ON/OFF OFF
PERSIAN ON/OFF OFF M9 BT 0~63 48
TURKISH ON/OFF OFF CT 0~63 48
FRANCE ON/OFF OFF SC OFF
RUSSIA ON/OFF OFF RB 0~63 32
GB 0~63 32
M6 SHIPMODE RD 0~63 32
SEARCH SPEED 0~3 0 GD 0~63 32
M7 AGC-TOP 0~63 25 BD 0~63 32
AGC-SPEED 0~3 2 SB 0~63 40
9
b) TDA9361(1.1) EK cord=NTDA9361-----NF
MI Items Variable Preset MI Items Variable Preset
M0 AVL ON/OFF ON M4 SUBCON 0~63 63
FSL ON/OFF ON SUBCOL 0~63 63
FMWS ON/OFF OFF SUBSHP 0~63 63
FFI ON/OFF OFF SUBTINT 0~15 15
OSO ON/OFF ON YDLY PAL 0~15 12
FCO ON/OFF OFF YDLY NTSC 0~15 12
WOOFER ON/OFF OFF YDLY SEC 0~15 12
DUAL OUT 0~1 0 YDLY AV 0~15 12
Volume mode 0~1 1 UOC VOL ON/OFF Off
CATHODE 0~15 15
M1 BAND 0~2 2 SC BRI 0~63 10
AV CFG* 0~8 3
NTSC MX USA M6 LOGO ON/OFF ON
VIDEO OUT CVBS LOGO COLUR 0~7 0
PIN5 NTSC LOGO POSITION 0~11 0
PRO 0~3 0 LOGO CHAR
SHIPMODE
M2 VISION IF 38.9M SEARCH SPEED 0~3 0
DK ON/OFF OFF
BG ON/OFF ON M7 AGC-TOP 0~63 25
I ON/OFF OFF AGC-SPEED 0~3 2
M ON/OFF OFF
SIF PREFER BG M8 FREQUENCY 50HZ 60HZ
AUTO SOUND ON/OFF ON VSLOPE 0~63 31 31
VSHIFT 0~63 31 31
M3 START ON 0~2 0 VAMP 0~63 31 31
ENGLISH ON/OFF ON VSCOR 0~63 31 31
ARABIC ON/OFF OFF HSHIFT 0~63 31 31
PERSIAN ON/OFF OFF
TURKISH ON/OFF OFF M9 BT 0~63 48
FRANCE ON/OFF OFF CT 0~63 48
RUSSIA ON/OFF OFF SC OFF
Spanish bit 0~1 0 RB 0~63 32
TXT DEF 0~3 0 GB 0~63 32
RD 0~63 32
M5 OSD VPOS 0~63 53 GD 0~63 32
OSD HPOS 0~59 15 BD 0~63 32
WIDE 0~63 15 SB 0~63 40
ZOOM 0~63 59
NENU TITLE 0~6 3
10
5. ICs functional description
UOC TDA93XX
SYMBOL PIN DESCRIPTION
STAND BY output. 1 In STAND BY mode, high level (Power OFF).
For Power ON this pin will be reduced to low.
SCL 2 I2C-bus clock line
SDA 3 I2C-bus data line
TUNING 4 tuning Voltage (Vt) PWM output
P3.0/NTSC SW 5 Port 3.0 or NTSC output/SCART SW input, Forced NTSC selection,
Low-level output, otherwise High output.
KEY 6 Control keys input *3
VOL 7 Sound Volume control PWM output
MUTE 8 Sound mute output
VSSC/P 9 Digit ground for -controller core and periphery
BAND1 10 Tuner Band selection output
BAND2 11 Tuner Band selection output
VSSA 12 Analog ground of teletext decoder and digital ground of TV-processor
SECPLL 13 SECAM PLL decoupling
VP2 14 2nd supply voltage TV-processor(+8V)
DECDIG 15 decoupling digital supply of TV-processor
PH2LF 16 Phase-2 filter
PH1LF 17 Phase-1 filter
GND3 18 Ground 3 for TV-processor
DECBG 19 Band gap decoupling
AVL/EWD 20 Automatic volume leveling /EAST-WEST drive output
VDRB 21 Vertical drive B output
VDRA 22 Vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 Reference current input
VSC 26 Vertical sawtooth capacitor
TUNER AGC 27 Tuner AGC output
AUDEEM/SIFIN1 *1 28 Audio deemphasis or SIF input
DECSDEM/SIFIN2 29 decoupling sound demodulator or SIF input 2
GND2 30 ground 2 for TV processor
SNDPLL/SIFAGC *1 31 narrow band PLL filter or AGC sound IF
AVL/SNDIF/REF0/ 32 Automatic Volume Levelling / sound IF input / subcarrier reference output / audio
AMOUT *1 deemphasis
HOUT 33 horizontal output
FBISO 34 flyback input/sandcastle output
11
AUDEXT/QSSO/ 35 external audio output / QSS intercarrier out
AMOUT *1
EHTO 36 EHT/overvoltage protection input
PLL IF 37 IF-PLL loop filter
IFVO/SVO 38 IF video output / selected CVBS output
VP1 39 supply voltage TV processor
CVBS INT 40 internal CVBS input
GND1 41 ground for TV processor
CVBS/Y 42 CVBS/Y input
CHROMA 43 C input
AUDOUT/AMOUT *1 44 audio output /AM audio output (volume controlled)
INSSW2 45 2nd RGB / YUV insertion input
R2/VIN 46 2nd R input / V (R-Y) input / PR input
G2/YIN 47 2nd G input / Y input
B2/UIN 48 2nd B input / U (B-Y) input / PB input
BCLIN 49 beam current limiter input
BLKIN 50 black current input / V-guard input
RO 51 Red output
GO 52 Green output
BO 53 Blue output
VDDA 54 analog supply of Closed Caption decoder and digital supply of TV-processor (3.3
V)
VPE 55 OTP Programming Voltage
VDDC 56 digital supply to core (3.3 V)
OSCGND 57 oscillator ground supply
XTALIN 58 crystal oscillator input
XTALOUT 59 crystal oscillator output
RESET 60 reset
VDDP 61 digital supply to periphery (+3.3 V)
P1.0/INT1 62 TV/AV (AV1) / AV2 /S-VHS mode Output.
P1.1/T0 63 TV/AV (AV1) / AV2 /S-VHS mode Output.
P1.2/INT0 64 Remote control signal input.
Note
1. The function of pin 20, 28, 29, 31, 32, 35 and 44 is dependent on the IC version (mono intercarrier FM demodulator
/QSS IF amplifier and East-West output or not) and on some software control bits. The valid combinations are given in
table 1.
2. the vertical guard function can be controlled via pin 49 or pin 50. the selection is made by means of the
IVG bit in subaddress 2BH.
12
TABLE 1
IC version FM-PLL version QSS version
East-West N Y N Y
Y/N
CMB1/CMB 00 01/10/1 00 01/10/1 00 01/10/11 00 01/10/11
0 bits 1 1
AM bits - - - - - 0 1 - 0 1
Pin 20 AVL EWD AVL EWD
Pin 28 AUDEEM SIFIN1
Pin 29 DECSDEM SIFIN2
Pin 31 SNDPLL SIFAGC
Pin 32 SNDIF(1 REFO(2) AVL/SNDIF(1 REFO(2) AMOUT REFO(2) AMOUT REFO(2)
) )
Pin 35 AUDEXT AUDEX QSS AMOU AUDEXT QSS AMOU
T O T O T
Pin 44 AUDOUT Controlled AM or audio out
Note
1. When additional (external) selectivity is required for FM-PLL system pin 32 can be used as sound IF input.
This function is selected by means of SIF bit in subaddress 28H.
2. the reference output signal is only available for the CMB1/CMB0 setting of 0/1. for the other settings this pin is
a switch output(see also 5 table 67).
Pin No. 6: Control keys input (Max. Limit voltage)
Function POWER MENU TV/AV V- V+ P- P+
Voltage 0 0.4125 0.825 1.2375 1.65 2.0625 2.475
13
AN7522/7523 Function : audio output
Symbol PIN Function Symbol PIN Function
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.
LA78040/78045 Function : vertical output
Symbol PIN Function Symbol PIN Function
INV IN 1 Input V OUT 5 Vertical output
VCC1 2 Power VCC2 6 Output power supply
PUMP UP 3 Pump up power NON INV IN 7 Negative feedback
GND 4 Ground
TDA9859 Function : Universal Sound processor
Symbol Pin Function Symbol Pin Function
AV1L 1 AV1 Audio Left input AV1R 32 AV1 Audio input Right
P1 2 Not used P2 31 Not used
MAINL 3 Main Audio Left input AV2R 30 AV2 Audio input Right
CSMO 4 Smoothing Capacitor CPS1 29 Pseudo stereo Cap. 1
MAINR 5 Main Audio Right input AV2L 28 AV2 Audio input Left
VP 6 Power Supply CPS2 27 Pseudo stereo Cap. 2
OUT R 7 Right Output OUT L 26 Left Output
GND 8 Ground MAD 25 Not used (GND)
LINOR 9 Line Output Right LINOL 24 Line Output Left
LINIR 10 Line Input Right LINIL 23 Line Input Left
CBR1 11 Bass Cap. Right 1 CBL1 22 Bass Cap. Left 1
CBR2 12 Bass Cap. Right 2 CBL2 21 Bass Cap. Left 2
Headphone R 13 Headphone-R output Headphone L 20 Headphone-L output
CTR 14 Treble Cap. Right CTL 19 Treble Cap. Left
MAINOR 15 Main Audio out Right MAINOL 18 Main Audio out Left
SCL 16 I2C Bus clock SDA 17 I2C Bus data
CD 8145 Function : EW parabola correction
Symbol PIN Function Symbol PIN Function
Keystone input 1 Trapezium NON INV IN 8 Non-inverting 100 ua
correction input Current sink
Sawtooth input 2 frame sawtooth INV IN 7 Parabola output
current input Inverting input
I ref 3 Current reference VCC 6 VCC
GND 4 Ground Output 5 Output
14
6. Test point Waveforms
2.6Vpp 1.2Vpp 3.8Vpp 2.5Vpp 2.5Vpp
H H H H H
TDA93XX PIN38 TDA93XX PIN40 TDA93XX PIN53 TDA93XX PIN52 TDA93XX PIN51
95Vpp 95Vpp 95Vpp 0.9Vpp 5Vpp
H
H H H H
TDA93XX PIN33 TDA93XX PIN34
CRT KR CRT KG CRT KB
1Vpp 0.8Vpp 1.3Vpp 2.7Vpp
1000Vpp
V V H H
V451 B V451 C
TDA93XX PIN21 TDA93XX PIN22 TDA93XX PIN59
22Vpp 300Vpp
H H
HEATER T511 PIN7
15
7. IC voltages
TDA93XX
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
V 2.8 3.8 3.6 3.3 3.5 3.5 0.1 0.1 0 5.4 0.1 0 2.3 8 5 3
PIN 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
V 4 0 4 0.9 0.7 0.8 1.9 1.9 3.9 3.8 1.6 3.2 3.4 0 2.4 0.1
PIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
V 0.6 0.5 3.7 1.7 2.4 3.1 8 3.8 0 3.4 1.5 3.6 2.3 2.6 2.6 2.6
PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
V 2.3 7.2 2.7 2.7 2.7 3.5 0 3.5 0.1 1.7 1.8 0 3.5 0.1 0.1 5
LA76040
PIN 1 2 3 4 5 6 7
V 0.7 15 -12 -15 0.3 15.9 -0.07
AN 7522
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
TDA9859
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14
V 4.0 0 4.0 8.0 4.0 8.0 4.0 0 4.0 4.0 4.0 4.0 4.0 4.0
PIN 15 16 17 18 19 20 21 22 23 24 25 26 27 28
V 4.0 4.5 4.6 4.0 4.0 4.0 4.0 4.0 4.0 4.0 0 4.0 4.0 4.0
PIN 29 30 31 32
V 4.0 4.0 0 4.0
CD 8145
PIN 1 2 3 4 5 6 7 8
V 1.6 1.8 8.2 0 9.4 26.5 10 10
16
8. 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