This Simplified Service Manual is issued to add listed models to the Main Service Manual order No. MTNC010527C1
(CT-27SX31E). A set of schematics, unique settings and a complete parts list are included in this Manual.
Please file and us e this Simplified Service Ma nual together with Main Serv ice Manual, order No. MTNC010527C1
(CT-27SX31E).
Chassis
“WARNING! This Service Man ual is desig ned for expe rienced repa ir technici ans only and is not designed f or use by t he general p ublic.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired onl y by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this Service Manual by anyone else cou ld result in serious injury or death.”
The service technician is required to read and follow the “Safety Precautions” and “Important Safety Notice” in the Ma in Ma nual.
Copyright 2001 by M atsush ita Elec tric Co rporatio n of
America. All rights reserved. Unauthorized copying
®
and distribution is a violation of law.
Page 2
Important Safety Notice
Special components are us ed in this television s et which are important for safety. These parts are identified on the
schematic diagram by the sy mbol and printed in BOLD TYPE on the replaceme nt part list. It is essenti al that
these critical parts are replaced with the manufacturer ’s specified replacement part to prevent X-ray radiation,
shock, fire or other hazards. Do not modify the original design without the manufacturer’s permission.
Safety Precautions
General Guidelines
An Isolation Transformer should always be used
during the servicing of a r eceiver whose c hassis is not
isolated from AC power line. Use a transformer of
adequate power rating a s this protects the techn ician
from accidents resulting in personal injury from
electrical shocks. It will also protec t the Receiver from
being damaged by accide ntal shorting that may occur
during servicing.
When servicing, observe the original lead dress,
especially in the high voltage circuit. Replace all
damaged parts (also parts that show signs of
overheating.)
Always Replace Protective Devices, such as
fishpaper, isolation resistors and capacitors, and
shields after servicing the Receiver. Use only
manufacturer ’s recommended rating for fuses, circu its
breakers, etc.
High potentials are present when this Receiver is
operating. Operation of the Receiver without the rear
cover introduces danger for elect rical shock. S ervicing
should not be performed by anyone who is not
thoroughly familiar with the necessary precautions
when servicing high-voltage equipment.
Extreme care should be practiced when Handling the
Picture T ube. Rough handling may cause it to implode
due to atmospheric pres sure. (14.7 lbs per sq. in.). D o
not nick or scratch the glass or subject it to any undu e
pressure. When handling, use safety goggles and
heavy gloves for protection. Discharge the picturetube by shorting the anode to chassis ground (not to
the cabinet or to other mounting hardware). When
discharging connect cold ground (i.e. dag ground lead)
to the anode with a well insulated wire or use a
grounding probe.
Avoid prolonged exposure at close range to unshielded
areas of the picture tube to prevent exposure to
X-ray radiation.
The Test Picture Tube used for servicin g the chassis
at the bench should incorporate safety glass and
magnetic shieldi ng. The safety glass pro vide shielding
for the tube viewing area against X-ray radiation as
well as implosion. The m agnetic shield limits the X-ray
radiation around the bell of the pict ure tube in addition
to the restricting magnetic effects. When using a
picture tube test jig for service, ensure that the jig is
capable of handling 50kV without causing
X-ray radiation.
Before returning a serviced rec eiver to the owner,
the service technic ian must thoroughly test the unit to
ensure that is completely safe to operate. Do not use a
line isolation transformer when testing.
Leakage Current Cold Check
Unplug the AC cord and connect a jumper between the
two plug prongs.
Measure the resistance between the jumpered AC plug
and expose metallic parts such as screwheads,
antenna terminals, control shafts, etc. If the exposed
metallic part has a return path to the chassis, the
reading should be between 240kΩ and 5.2MΩ. If the
exposed metall ic part does not have a re turn path to
the chassis, the re adi ng sh oul d be infinite.
Leakage Current Hot Check (Fig. 1)
Plug the AC cord directly into the AC outlet. Do not use
an isolation transformer during the check.
Connect a 1.5kΩ 10 watt resistor in parallel with a
0.15µF capacitor between an exposed metallic part
and ground. Use earth ground, for example a
water pipe.
Using a DVM with a 1000 ohms/volt sensitivity or
higher, measure the AC potential across the resistor.
Repeat the procedure and measure the voltage
present with all other exposed metallic parts.
Verify that any potential does not exceed 0.75 volt
RMS. A leakage cu rrent te ster (such a Simp son M odel
229, Sencore Model P R57 or equiv alent) may be used
in the above procedure, in which case any current
measure must not exceed 0.5 milliamp. If any
measurement is out of the specified limits, th ere is a
possibility of a shoc k haz ar d and the Receiver mus t be
repaired and rechecked before it is returned to the
customer.
AC VOLTMETER
COLD
WATER
PIPE
(GROUND)
0.15µF
TO INSTRUMENT’S
EXPOSED METAL
PARTS
1500Ω,10 W
Figure 1. Hot Check Circuit
X-ray Radiation
WARNING: The potential source of X-ray radiation in the
TV set is in the High Voltage section and th e pictu re tube .
Note: It is important to use an accurate, calibrated
high voltage meter.
Set the brightness, picture, sharpness and color
controls to Minimum. Measure the High Voltage. The
high voltage should be 30.55 ± 1.25kV. If the upper
limit is out of tolerance, immediate service and
correction is required to insure safe operation and to
prevent the possibility of premature component failure.
the solid state devices due to arcing or static
discharge, make certain that al l ground wires and CTR
DAG wire are securely connected.
WARNING: This Receiver has been designed to meet
or exceed applicable safety and X-ray radiation
protection as specified by government agencies and
independent testing laboratories.
CAUTION: The power supply circuit is above earth
ground and the chassis cannot be polarized. Use an
isolation transformer when servicing the Receiver to
avoid damage to the test equipment or to the chassis.
Connect the test equipment to the proper groun ( ) or
( ) when servicing, or incorrect voltages will be
measured.
Board Table Description
BOARDPART NUMBERBOARD DESCRIPTION
A-BOARDTNP2AH025CAMain board
To maintain original product safety design standards
relative to X-ray radiation and shock and fire hazard,
parts indicated with the s ymbol on the schematic
must be replaced with identical parts. Order parts from
the manufacturer’s parts center using the parts
numbers shown in this servic e manual, or provide the
chassis number and the part reference number.
For optimum performance and reliability, all other parts
should be replaced with components of
identicalspecification.
* Note: When ordering a replacement board assembly,
append an “S” to the board number.
Example: To order the A-Board, the replacement board is
TNP2AH025CAS.
- 4 -
Page 5
Receiver Feature Table
FEATURE/MODELCT-24SX11E/CE/UE
ChassisAP367
Tuning system96K
# of channels181
Menu languageEng/Span/Fr
Closed CaptionX
V-ChipX
75 Ω inputX
Remote Model #EUR511502
Picture tubeA60LUQ085X
PureFlat Picture TubeX
Comb Filter3 Line Digital
V. Edge CorrectionX
V/A normBoth
Color Te mp.X
MTS/SAP/DBXX
Bass/Treble/BalanceX
Surround SoundX
AI SoundX
Spatializer/BBEBBE
FAO & VAOX
Built-in audio power7Wx2 (10%)
# of speakers2
A/V in (rear/front)3(2/1)
Component Input1(1/0)
S-VHS Input (rear/front)1/1
Headphone JackX
Dimensionsmm
(WxDxH)in
Weight (kg/lbs)35/77.16
Power source (V/Hz)120/60
Anode voltage30.55kV ± 1.25kV
Video input jack
Audio input jack500mV RMS 47kΩ
550x479x491.5
21.7 x 18.9 x 19.4
75Ω, phono jack
1V
p-p
Table 1. Receiver Features
Specifications are subject to change without notice or obligation.
Dimensions and weights are approximate.
- 5 -
Page 6
Location of Controls (Remote)
POWER Button
Press to turn ON and OFF.
MUTE Button
Press to mute sound.
A second press resumes sound.
Press also to access and delete
Closed Caption display.
VCR, DVD, LD/CD, AUX, TV, CBL,
DBS, RCVR
Component function buttons
VOL (volume) Buttons
Press to adjust TV sound level.
Use with Channel buttons to
navigate in menus.
R-TUNE (Rapid Tune) Button.
Press to switch to the previous
channel.
ACTION Button
Press to display Main Menu and
access or exit On Screen features
and Adjustment Menus.
REW, PLAY, FF, TV/VCR, STOP,
PAUSE, REC, VCR CHANNEL
Component function buttons.
TV/VIDEO Button
Press to select TV or Video input.
CH (channel) Buttons
Press to select channel s .
Use with volume buttons to
navigate in menus.
Figure 2. Location of Controls (Remote).
EUR511502
- 6 -
Page 7
Service Mode (Electronic Controls)
This Receiver has electronic technology using the I²C Bus Concept. It performs as a control function and it
replaces many mechanical controls. Instead of adjusting mechanical controls individually, many of the control
functions are now performed by using “On Screen Display Menu”. (The Service Adjustment Mode.)
Note: It is suggested that the tec hnician reads all the way through and understand the following proced ure for
Entering/Exiting the Service Adjustment Mode; then proceed with the instructions working with the
Receiver. When becoming familiar with the procedure, the Flow Chart for Service Mode may be used as a
quick guide.
Quick Entry to Service Mode:
At times when minor a djustments need to b e done to the electroni c controls, the meth od of Entering the ser vice
Mode without removal of the cabinet back is as follows using the Remote Control:
1. Select SET-UP icon and select CABLE mode.
2. Select TIMER icon and set SLEEP time for 30 Min.
3. Press ACTION button 3 times to exit menus.
4. Tune to the Channel 124.
5. Adjust VOLUME to minimum ( 0) .
6. Press the VOL button (decrease) on Receiver. Red “CHK” appears in upper corner.
To toggle between Aging and Service modes:
While the “CHK” is displayed on the left top corner of the CRT, pressing the Action and the Volume Up buttons
on the Receiver si multaneously will toggle between the modes. Red “CHK” for Service and yellow “CHK ” for
Aging.
7. Press the Power Button on the Remote Control to select one of the Service Adjustment Modes.
1) B Service VCJ S U B-DATA ADJUSTMENT.
2) C Service VCJ CUT- O F F ADJUSTMENT.
3) D Service GEOMETRY ADJUSTMENT.
4) M Service MTS ADJUSTMENTS.
5) P Service PIP ADJUSTMENT.
6) S Service S OPTION ADJUSTMENTS.
7) X Service COMB FILTER ADJUSTMENT.
8) E Service AUDIO ADJUSTMENTS
9) “CHK” = Normal operation of CHANNEL and VOLUME .
Note: Only the appli c able settings for
b
32 B 02 215 C 0
a
b
a
the Receiver serviced will be
available (See
a
in Fig. 3).
An address Menu appears in the right
hand corner of the screen
Figure 3. Service Mode Menu Adjustments.
Exiting the Service Mode:
Press the Action and the Power buttons on the Receiver simultaneously for at least 2 seconds.
THE RECEIVER EXITS SERVICE MODE.
The Receiver momentarily shuts off; then comes back on tuned to channel 3 with a preset level of sound.
Any programmed channels, channels caption data and some others user defined settings will be erased.
IMPORTANT NOTE:
Always Exit the Service Mode
Following Adjustments.
- 7 -
Page 8
Press the Power Button on the Remote Control to select the Service Adjustment.
For Adjustments:
1.Press Channel Up/Down on the
Remote Control to select one of
the available Se rvice Adjustments
(a in Fig. 3).
Note: Write Down the original
value set (b in
Fig. 3
) for
each address before
modifying anything. It is
easy to erroneously adjust
the wrong item.
2.Press Volume Up/Down on the
Remote Control to adjust the
level of the selected Service
Adjustment (b in Fig. 3).
2. In the Service Mode, select (B01) DAC Sub-Tint
Adjustment. Adjust until the waveform measured is
as the one shown in Fig. 25.
TP47B (A-Board)
A to B = 1 unit
B to C = 2 units
A
A
C
1 2 3 10
4 5 6 7 8 9
B
Figure 4. TP47B waveform
3. Connect the oscilloscope to TP47R (TPL1) and
cold GND.
4. Select DAC Sub-Color Adjustment (B00) and
adjust for peak to peak amplitude to be
0.95Vp-p ±0.1V as shown in Fig. 26.
TP47G (A-Board)
1 2 3 4 5 6
7 8 9 10
0.95Vp-p±0.1V
Figure 5. TP47R waveform
Remove short jumper and set RGB GAMMA (S03)
DAC to 1.
Color Temperature Adjustment
(B/W Tracking)
Service DAC Adjust.
(C00) (C01) (C02) (C04) (C05)
Minor Touch-Up Method
OBSERVE low and high brightness areas of a B/W
picture for proper tracking. Adjust only as required for
“good gray scale and warm hi ghl ights”.
1. LOW LIGHT areas – In Ser vice Mode for making
electronic adjustments, select Cutoff (C00) RED,
(C01) GRN, (C02) BLU and adjust the picture for
gray.
2. HIGH LIGHT areas – In Service Mod e for making
electronic adjustments, select Drive (C04) GRN,
(C05) BLU and adjust the picture for warm whites.
Complete Adjustment
Preparation:
1. Turn the Receiver “ON” and allow 30 minutes
warm up at high brightness.
2. Apply a color bar signal with color “OFF”.
3. Turn the SCREEN control (part of FBT T551) fully
counterclockwis e.
Procedure:
Preset the following Se rv i ce DACs for best results:
• C0 . . . . . . . . . . . . . .128
• C1 . . . . . . . . . . . . . 128
• C2 . . . . . . . . . . . . . .128
• C4 . . . . . . . . . . . . . . 64
• C5 . . . . . . . . . . . . . . 64
1. Connect the oscilloscope to TPL1 (C-Board).
2. In Service Mode, select the Sub-Bright DAC (B02).
3. Press the R-Tune key on the remote.
4. Observe the oscilloscope waveform at Horizontal
rate and adjust the Service Mode Sub-Bright DAC
(B02) level until a scanning period of 2.4V ab ove
DC ground is measured, as indicated in Fig. 28.
2.4V DC
0V DC
Figure 6. TPL1 Waveform
5. Press the R-Tune key on the remote.
6. Connect the scope to RED Cathode (KR) on the
CRT-Board.
7. In the Service Mode, select the RED CUTOFF
DAC (C00).
8. Press the R-Tune key on the remote.
9. View scope trace at Horizon tal rate and adjust th e
Service Mode DAC (C00) level until a scanning
period of 170V above DC g round is measured, as
indicated in Fig. 29.
10. Press the R-Tune key on the remote.
11. Write the same C00 data to C01 and C02.
12. Press the R-Tune key on the remote.
13. Turn the Screen Control (part of FBT) slowly
clockwise until a slightly color horizontal line
appears.
14. Adju st DAC C01 and C02 until the horizontal lin e
becomes white.
- 13 -
Page 14
15. Press the R-Tune key on the Remote
170±2V DC
Figure 7. KR Waveform
0V DC
(Ground)
16. In the Service Mode select the DAC DRIVE
adjustments (C04) GRN, (C05) BLUE and adjust
for warm white in a white color bar pattern.
17. Apply a mon oscope pattern and check for a good
picture.
18. Perform Minor Touch-Up Method if necessary.
EXIT the Service Mode
- 14 -
Page 15
Chassis Service Adjustment Procedures
All service adjustments are factory preset and should not require adjustment unless controls and/or
associated components are re placed.
Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use heat sink when the HOT ground symbol
( ) is used. Otherwise, use COLD ground () — Tuner shield.
IC6501
C003
+
-
TP
T
U
IC3001
N
E
R
18
+
C584
-
IC101
IC2301
IC451
A/V REAR INPUTS
+
C583
-
+
-
TPD8
IC001
C047
TPD9
TPD3
A-BOARD
Q551
TPD7
P-BOARD
IC4802IC4801
TPD11TPD10
TPD12
T801
Q801
140.0V B+ Voltage Confirmation
1. Set the Bright and the Picture to Minimum by
using the Picture Menu.
2. Connect the DVM between
(+ side) and cold
TPP12
ground (). (In P-Board).
3. Confirm that B+ voltage is 140.0V ± 1.5V. This
voltage supplies B+ to the Horizontal Output &
Flyback circuits.
P-Board B+ Voltages
120V AC line input. Se t the Bright and the Picture to
Minimum by using th e Picture Menu. Use cold ground
) for the (-) lead of the DVM.
(
.
LOCATION
(P-Board)
VOLTAGE
Board
connected
TPP12B+140.0V ± 1.5V90.0V ± 9V
TPP11
TPP10
STBY 12
SOUND
13.0V ± 2V8.2V ± 1V
33.0V ± 5V25.0V ± 3V
For Sound GND use connector P1-pin 5
VOL TAGE
Board
w/o connect
A-Board B+ Voltages
120V AC line input. Set the Bright and the Picture to
Minimum by using th e Picture Menu. Use cold ground
) for the (-) lead of the DVM.
(
LOCAT ION (A-Board)VOLTAGE
C584 (+)
C583 (+)
TPD9
TPD3
TPD8
C047 (+)
TPD7
MAIN 9
MAIN 5
MAIN -15
MAIN 15
MAIN 7.5
ST-BY
MAIN 220
Adjust Picture Menu for normalized video adjustments.
9.0V ± 0.5V
5.0V ± 0.3V
-15V ± 2V
15V ± 2V
7.1V ± 1.0V
3.3V ± 0.2V
220V ± 9.0V
- 15 -
Page 16
Speaker
Bracket
Speaker
Rear View
Deflection YokeCRT Anode, HV
C-Board
TunerP-Board
Figure 8. CT-24SX11E/CE/UE Rear View
Rear AV Jacks
Degauss
Coil
- 16 -
Page 17
NOTES:
- 17 -
Page 18
REPLACEMENT PARTS LIST
Model:CT-24SX11E, CT-24SX11UE, CT-24S X11CE
Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing
any of these components use only manufacturer’s specified parts.
REF NO.PART NO.DESCRIPTION
CAPRISTORS
CRA801TP00842-51TAPING GAP TERMINAL
CRA802TP00842-51TAPING GAP TERMINAL
C- Board Schematic, Layout & Voltages - Diagrama Eléctrico, Diagrama Impreso y Voltajes Tarjeta-C
ALL MODELS
IC351
1
. . . . . .1.75
2
. . . . . .1.75
3
. . . . . .1.76
4
. . . . . .0.00
5
. . . . . .1.85
6
. . . .218.39
7
. . . .141.10
8
. . . .142.90
9
. . . .144.90
C-Board V oltages - Voltajes Placa-C
Q369
B
C
E
6.90
2.11
8.39
Q956
B
C
E
1.00
73.80
0.00
Q951
2.48
8.93
1.85
Q957
7.20
0.00
7.84
Q952
1.13
7.20
0.49
Q958
7.19
8.93
6.51
Q953
7.84
8.93
7.20
Q961
0.00
0.00
0.00
Q954
6.51
0.00
7.15
Q962
3.10
8.94
2.49
Q955
141.90
73.70
142.40
- 27 -
CHIP TRANSISTOR
LEAD DESIGNATION
B
E
IDENTIFICACIÓN DE TERMINALES
PARA TRANSISTORE S EN
B
E
C
CHIP
C
Schematic Notes
1.Resistors are carbon 1/4W unless noted
otherwise.
2.Ca pacitors are ceramic 50V un less noted
otherwise.
3.Coil valu e n otes is inductance in µH.
4.Test point indicated by ; Test point but
no pin .
5.Co mponents in dicated w ith are criti cal
parts and replacement should be made
with manufacture specified replacement
parts only.
Notas de los Diagramas
1.Las Res istencias son de Carbón de 1/4W, a
menos que se indique otra característica.
2.Los Capacitores son de Cerámica para 50V, a
menos que se indique otra característica.
3.El valor indicado de las Bobinas es la
inductancia expresada en µH.
4.Los p untos de prueb a en la term inal de algún
componente son indicados por Los puntos
de prueba fuera de los componentes se
indican con .
5.Los componentes señalados con el símbolo
son considerados compon entes críticos y
6. (BOLD LINE) indicates the
route of B+ supply.
7.The schematic diagrams are current at
the time of printing an d are subject to
change without notice.
8.Ground symbol indicates HOTGROUND CONNECTION;
indicates COLD GROUND.
NOTE: All other component symbols are
used for engineering design
purposes.
deben ser reemplazado s sólo con las partes
especificadas por el fabricante.
6. (LINEA GRUESA) indica las líneas de
alimentación de los Voltajes B+.
7.Los diagramas eléctricos están sujetos a
cambio sin previo aviso.
8.El símbolo indica que es una conexión a
Tierra Caliente y el símbolo indica
conexión a Tierra F ría.
NOTA: Los demas símbolos de componentes
incluidos son usados con fines de
diseño.
Page 28
ALL MODELS
A-Board Schematic, Left Portion - Diagrama Eléctrico de la Tarjeta-A, Sección Izquierda
- 28 -
Page 29
A-Board Schematic, Right Portion - Diagrama Eléctrico de la Tarjeta-A, Sección Derecha
ALL MODELS
IMPORTANT SAFETY NOTICE
THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL FEATURES
THAT ARE IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE
AND ELECTRICAL SHOCK HAZARDS. WHEN SERVICING IT IS
ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE
USED FOR THE CRITICAL COMPONENTS DESIGNATED WITH A IN
THE SCHEMATIC.
1.Medición de voltaje:
-El voltaje de entrada al Receptor
es de 120V de Corriente Alterna.
Un generador de patrones con
formato NTSC se conecta a la
entrada de la antena. (Patrón de
Barras de Colores con 100 IREs
para el Blanco y 7.5 IREs para el
Negro.)
-Los ajustes de los Menus Picture y
Audio se normalizan.
En el Menú Set-Up, en la opción
ANTENA, se selecciona el modo de
CABLE.
El nivel de Volumen se minimiza.
De los modos TV y Video,
seleccionar el modo TV.
Seleccionar modo Estereo del
Audio.
Medición de Voltajes
-Las mediciones de los voltajes
son nominales y pueden variar
hasta 10% en componentes en
funcionamiento. Las lecturas
de los voltajes pueden variar
por la potencia de la señal y el
contenido de la imagen.
-Las fuentes de voltajes son
nominales.
2.El símbolo indica el tipo de tierra
que se utiliza en la conexión del
medidor.
PRECAUCION: Si no se utiliza la
conexión a la tierra adecuada, se
obtendrán mediciones equivocadas
y podría dañar el equipo de
medición.
Voltage Measurements
1.Voltage measurement:
-AC input to the Receiver is 120V.
NTSC (HD, 1125i & 525P when
applicable) signal generator is
connected to the antenna of the
Receiver. (Color bar pattern of
100 IRE white and 7.5 IRE black.)
-All Picture and Audio adjust men ts
are set to Normalize.
TV ANT/CABLE - (Set-Up Menu)
in TV/ANT Mode
Vol ume - Mi n.
TV/Video SW - TV position
Audio Mode - Stereo
NOTA DE SEGURIDAD
LOS DIAGRAMAS ELÉCTRICOS INCLUYEN CA RACTERÍSTICAS
ESPECIALES MUY IMPORTANTES PARA LA PROTECCIÓN
CONTRA RAYOS-X, QUEMADURAS Y DESCARGAS
ELÉCTRICAS. CUANDO SE DE SERVICIO ES IMPORTANTE
USAR PARA REEMPLAZO DE COMPONENTES CRITICOS,
SOLO PARTES ESPECIFICADAS POR EL FABRICANTES. LOS
COMPONENTES CRITICOS ESTAN SEÑALADOS EN LOS
DIAGRAMAS POR EL SIMBOLO
-Voltage readings are nominal
and may vary ±10% on active
devices. Some voltage
reading will vary with signal
strength and picture content.
-Supply voltages are nominal.
2.Ground symbol indicates
ground lead connection of meter.
Incorrect ground connection will
result in erroneous readings.
CAUTION: Incorrect ground
connection of the test equipment
will result in erroneous readings.
IDENTIFICACIÓN DE TERMINALES
PARA TRANSISTORE S EN
B
E
CHIP TRANSISTOR
LEAD DESIGNATION
B
E
CHIP
C
C
Nota:
La medición de los voltajes se
hizo con un Voltímetro Digital.
Note:
Obtained voltages with a digital
multimeter.
Medición de Formas de Onda
1.Un símbolo como indica el punto
para medir una señal. (La medic ión
puede hacerse en el punto con
mayor accesibilidad, siempre que
sea común al indicado.)
2.Se midieron utilizando un
generador con formato NTSC
conectado a la terminal de la
antena. (Patrón de 8 Barras de
Colores EAI, formato NTSC de 100
IREs para el Blanco y 7.5 IREs
para el Negro.)
3.Los ajustes de usuario de los
Menus PICTURE y AUDIO se
normalizaron. Posteriormente el
nivel de volumen se ajusta al
mínimo.
3
4.Las formas de onda de Video y
Color fueron tomadas con un
osciloscopio de banda alta y con un
punta de prueba de baja
capacitancia (10 a 1). La forma y
amplitud de las ondas puede variar
según el tipo de osciloscopio que
se utilice y sus características.
5.El símbolo de tierra que apar ece
junto al número de la forma de
onda, indica que se utiliza conexión
a Tierra Caliente en el extremo
negativo de la punta de prueba.
PRECAUCION: Si no se utiliza la
conexión a la tierra adecuada, se
obtendrán mediciones equivocadas
y podría dañar el equipo de
medición.
- 31 -
1.Medición de voltaje:
-El voltaje de entrada al Receptor
es de 120V de Corriente Alterna.
Un generador de patrones con
formato NTSC se conecta a la
entrada de la antena. (Patrón de
Barras de Colores con 100 IREs
para el Blanco y 7.5 IREs para el
Negro.)
-Los ajustes de los Menus Picture y
Audio se normalizan.
En el Menú Set-Up, en la opción
ANTENA, se selecciona el modo de
CABLE.
El nivel de Volumen se minimiza.
De los modos TV y Video,
seleccionar el modo TV.
Seleccionar modo Estereo del
Audio.
Medición de Voltajes
-Las mediciones de los voltajes
son nominales y pueden variar
hasta 10% en componentes en
funcionamiento. Las lecturas
de los voltajes pueden variar
por la potencia de la señal y el
contenido de la imagen.
-Las fuentes de voltajes son
nominales.
2.El símbolo indica el tipo de tierra
que se utiliza en la conexión del
medidor.
PRECAUCION: Si no se utiliza la
conexión a la tierra adecuada, se
obtendrán mediciones equivocadas
y podría dañar el equipo de
medición.
Page 32
ALL MODELS
P-Board Schematic, Layout & Voltages - Diagrama Impreso, Eléctrico y Voltajes Tarjeta-P
L
V
- 32 -
Page 33
IC801
1
. . . . 14.09
2
. . . . 15.76
3
. . . . . 0.16
4
. . . . 13.02
IC802
1
. . . . .11.00
2
. . . . . 3.45
3
. . . . . 0.00
4
. . . . .11.00
IC820
1
. . . . 13.02
2
. . . . . 0.00
3
. . . . . 2.44
P- Board Layout & Volt ages - Cir cuito Impreso y Voltajes Tarjeta-P
ALL MODELS
Q001
B
C
E
0.00
0.00
0.00
Q821
B
C
E
IDENTIFICACIÓN DE TERMINALES
PARA TRANSISTORE S EN
0.56
0.00
0.00
B
E
Q007
Q822
11.00
CHIP
C
0.69
0.36
0.00
0.00
0.00
Q801
0.10
-30.50
3.43
Q804
0.00
3.45
0.00
Q803
0.00
3.40
0.00
Q805
0.00
3.43
0.00
CHIP TRANSISTOR
LEAD DESIGNATION
B
E
C
Nota:
La medición de los voltajes se
hizo con un Voltímetro Digital.
IMPORTANT SAFETY NOTICE
THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL FEATURES
THAT ARE IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE
AND ELECTRICAL SHOCK HAZARDS. WHEN SERVICING IT IS
ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE
USED FOR THE CRITICAL COMPONENTS DESIGNATED WITH A IN
THE SCHEMATIC.
Note:
Obtained voltages with a digital
multimeter.
NOTA DE SEGURIDAD
LOS DIAGRAMAS ELÉCTRICOS INCLUYEN CA RACTERÍSTICAS
ESPECIALES MUY IMPORTANTES PARA LA PROTECCIÓN
CONTRA RAYOS-X, QUEMADURAS Y DESCARGAS
ELÉCTRICAS. CUANDO SE DE SERVICIO ES IMPORTANTE
USAR PARA REEMPLAZO DE COMPONENTES CRITICOS,
SOLO PARTES ESPECIFICADAS POR EL FABRICANTES. LOS
COMPONENTES CRITICOS ESTAN SEÑALADOS EN LOS
DIAGRAMAS POR EL SIMBOLO
.
- 33 -
Page 34
ALL MODELS
A-Board Waveforms - Formas de Onda Tarjeta A
Waveforms - A-Board
N/A
1.0-1.1V p-p [20µs]
1
IC3001 PIN 36 (VIDEO)
1.1-1.3V p-p [20µs]
2
IC3001 PIN 32 (Y IN)
0.8 p-p [20µs]
3
IC3001 PIN 34 (C IN)
3.58MHz X’tal
IC101 PIN 49
4
3.58VCO
OSC
3.9-5.4V p-p [20µs]
5
6
7
8
(R OUT)
TP47R
3.8-5.0V p-p [20µs]
(G OUT)
TP47G
3.8-5.1V p-p [20µs]
(B OUT)
TP47B
1.0-1.2V p-p [20µs]
IC101 PIN 38 (SYNC)
4.1-4.2V p-p [5ms]
913
IC101 PIN 33 (VERT OUT)
1.2-1.3V p-p [5ms]
10
IC101 PIN 25 (DRIVE)
53.6-56.3V p-p [5ms]
11
IC451 PIN 2 (VERT OUT)
28.4-30.0V p-p [5ms]
12
IC451 PIN 3
503KHz X’tal
IC101 PIN 41
14
15
16
IC101 PIN 34 (H SYNC)
H OSC
OSC
5.9-6.1V p-p [20µs]
IC101 PIN 35 (H OUT)
7.7-7.9V p-p [20µs]
178.0-180.0V p-p [20µs]
17
Q501 Collector (H DRIVE)
268.0-272.0V p-p [20µs]
18
19
T551 PIN 1
27.2-27.6V p-p [20µs]
T551 PIN 6
344.0-348.0V p-p [5µs]
20
IC803 PIN 2
344.0-348.0V p-p [5µs]
21
Q802 Collector
3
Waveform Measurements
1. indicates waveform measurement.
(Measurement can be taken at the
best accessible location in common
to the indicated point.)
2.Taken with an NTSC signal
generator connected to the antenna
terminal. (NTSC color bar pattern of
8 bars of EIA colors, 100 IRE white
and 7.5 IRE black.)
3.Customer Controls (Picture/Audio
Menu) are set to Normalize. Volume
is set to “MIN”.
4.All video and color waveforms are
taken with a wideband scope and
a probe with low capacitance (10
to 1). Shape and peak altitudes
may vary depending on the type
of Oscilloscope used and its
settings.
5.Ground symbol shown on
waveform number indicates (Hot)
ground lead connection of the
Oscilloscope.
CAUTION: Incorrect ground
connection of the test equipm ent will
result in errone ous re ad in gs .
Medición de Formas de Onda
1.Un símbolo como indica el punto
para medir una señal. (La medic ión
puede hacerse en el punto con
mayor accesibilidad, siempre que
sea común al indicado.)
2.Se midieron utilizando un
generador con formato NTSC
conectado a la terminal de la
antena. (Patrón de 8 Barras de
Colores EAI, formato NTSC de 100
IREs para el Blanco y 7.5 IREs
para el Negro.)
3.Los ajustes de usuario de los
Menus PICTURE y AUDIO se
normalizaron. Posteriormente el
nivel de volumen se ajusta al
mínimo.
3
4.Las formas de onda de Video y
Color fueron tomadas con un
osciloscopio de banda alta y con un
punta de prueba de baja
capacitancia (10 a 1). La forma y
amplitud de las ondas puede variar
según el tipo de osciloscopio que
se utilice y sus características.
5.El símbolo de tierra que apar ece
junto al número de la forma de
onda, indica que se utiliza conexión
a Tierra Caliente en el extremo
negativo de la punta de prueba.
PRECAUCION: Si no se utiliza la
conexión a la tierra adecuada, se
obtendrán mediciones equivocadas
y podría dañar el equipo de
medición.
- 34 -
NOTA DE SEGURIDAD
LOS DIAGRAMAS ELÉCTRICOS INCLUYEN CA RACTERÍSTICAS
ESPECIALES MUY IMPORTANTES PARA LA PROTECCIÓN
CONTRA RAYOS-X, QUEMADURAS Y DESCARGAS
ELÉCTRICAS. CUANDO SE DE SERVICIO ES IMPORTANTE
USAR PARA REEMPLAZO DE COMPONENTES CRITICOS,
SOLO PARTES ESPECIFICADAS POR EL FABRICANTES. LOS
COMPONENTES CRITICOS ESTAN SEÑALADOS EN LOS
DIAGRAMAS POR EL SIMBOLO
IMPORTANT SAFETY NOTICE
THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL FEATURES
THAT ARE IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE
AND ELECTRICAL SHOCK HAZARDS. WHEN SERVICING IT IS
ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE
USED FOR THE CRITICAL COMPONENTS DESIGNATED WITH A IN
THE SCHEMATIC.
.
Page 35
PARTS LIST ABBREVIATIONS GUIDE
RESISTOR
TYPETOLERANCE
CCarbonF± 1%
FFuseJ± 5%
M Metal OxideK± 10%
S SolidM± 20%
WWire WoundG± 2%
RES, C 270-J-1/4
CAPACITOR
TYPETOLERANCE
C CeramicC ± 0.25pF
E ElectrolyticD ± 0.5pF
P PolyesterF± 1pF
S StyrolJ± 5%
T TantalumK± 10%
L± 15%
M± 20%
P +10% -0%
Z +80% -20%
CAP, P .068UF-K-50V
- 35 -
Page 36
®
-32 -
Printed in USA
K01072223CM0731
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