Sharp 21MJ50 User manual

20J-S100/100S
CJ20S10/21MJ50
1
SERVICE MANUAL
In the interests of user-safety (Required by safety regulations in some countries ) the set should be
restored to its original condition and only parts identical to those specified should be used.
Specifications are subject to change without prior
notice.
20J-S100/S100S
CJ20S10
21MJ50
COLOR TELEVISION
Chassis No. SN-70
MODELS
?CH
>
–VOL
+
POWER
MTSSTEREO
V
I
D
EO
IN
L
-
A
U
D
I
O
-
R
ELECTRICAL SPECIFICATIONS
Page
»ELECTRICAL SPECIFICATIONS.............................................................................................1
»IMPORTANT SERVICE SAFETY PRECAUTION ....................................................................2
»LOCATION OF USER'S CONTROL.........................................................................................6
»INSTALLATION AND SERVICE INSTRUCTIONS....................................................................7
»CHASSIS LAYOUT ................................................................................................................13
»BLOCK DIAGRAM .................................................................................................................14
»SCHEMATIC DIAGRAMS ......................................................................................................15
»PRINTED WIRING BOARD ASSEMBLIES ............................................................................21
»REPLACEMENT PARTS LIST ...............................................................................................29
»PACKING OF THE SET .........................................................................................................37
CONTENTS
POWER INPUT ........................... 120 V AC 60 Hz
POWER RATING ........................................... 93W
PICTURE SIZE.....................1240cm2(192sq inch)
CONVERGENCE ....................................Magnetic
SWEEP DEFLECTION............................Magnetic
FOCUS....................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ............. 45.75 MHz
Sound IF Carrier Frequency.............. 41.25 MHz
Color Sub-Carrier Frequency ............ 42.17 MHz
(Nominal)
AUDIO POWER
OUTPUT RATING1.3+1.3W (at 10% distortion &
dual ch operate)
SPEAKER
SIZE ................................................8cm(Round)
VOICE COIL IMPEDANCE ....... 8ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF............................ 75 ohm Unbalanced
TUNING RANGES
VHF-Channels....................................... 2thru 13
UHF-Channels .................................... 14thru 69
CATV Channels................................... 1thru 125
USA: (EIA, Channel Plan)
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135
SHARP ELECTRONICS OF CANADA LTD.
335 Britannia Road East Mississauga, Ontario L4Z 1W9 Canada
SHARP CORPORATION
S77B620J-S100

20J-S100/100S
CJ20S10/21MJ50
2
IMPORTANT SERVICE SAFETY PRECAUTION
Service work should be performed only by qualified service technicians who are
thoroughly familiar with all safety checks and servicing guidelines which follow:
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
3. Semiconductor heat sinks are potential shock
hazards when the chassis is operating.
4. The chassis in this receiver has two ground systems
whichareseparated byinsulationmaterial. Thenon-
isolated (hot) ground system is for the B+ voltage
regulator circuit and the horizontal output circuit.The
isolatedgroundsystemisforthelow B+ DCvoltages
and the secondary circuit of the high voltage
transformer.
To prevent electrical shock use an isolation
transformer between the line cord and power
receptacle, when servicing this chassis.
SERVICING OF HIGH VOLTAGE SYSTEM
AND PICTURE TUBE
When servicing the high voltage system, re-
move the static charge by connecting a 10k
ohmresistor in serieswith an insulatedwire
(such as a test probe) between the picture
tube ground and the anode lead. (AC line
cord should be disconnected from AC out-
let.)
1. Picture tube in this receiver employs integral
implosion protection.
2. Replace with tube of the same type number for
continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing
shatterproof goggles and after discharging the high
voltage anode completely.
CAUTION: FOR CONTINUED
PROTECTION AGAINST A
RISKOF FIRE, REPLACE
ONLY WITH SAME TYPE 4A-
125V FUSE.
4A 125V
X-RADIATION AND HIGH VOLTAGE
LIMITS
1. Be sure all service personnel are aware of the
proceduresand instructions covering X-radiation.The
only potential source of X-ray in current solid state
TVreceiversis the picture tube.However,the picture
tubedoes not emit measurableX-Ray radiation ifthe
high
voltage is as specified in the "High Voltage Check"
instructions.
It is only when high voltage is excessive that X-
radiation is capable of penetrating the shell of the
picture tube including the lead in glass material. The
importantprecaution is to keep the highvoltagebelow
the maximum level specified.
2. It is essential that service personal have available at
all times an accurate high voltage meter.
The calibration of this meter should be checked
periodically.
3. Highvoltage should always be kept attheratedvalue
−no higher. Operation at higher voltages may cause
a failure of the picture tube or high voltage circuitry
and; also under certain conditions, may produce
radiation that exceeds specifications.
4. Whenthe high voltage regulator isoperatingproperly
thereis no possibility of an X-radiationproblem.Every
time a color chassis is serviced, the brightness
should be tested while monitoring the high voltage
with a meter to be certain that the high voltage does
notexceedthespecifiedvalueandthat it is regulating
correctly.
5. Do not use a picture tube other than that specified or
make unrecommended circuit modifications to the
high voltage circuitry.
6. Whentroubleshootingandtakingtestmeasurements
onareceiver with excessive high voltage, avoid being
unnecessarily close to the receiver.
Donot operate the receiver longerthan is necessary
to locate the cause of excessive voltage.

20J-S100/100S
CJ20S10/21MJ50
3
BEFORE RETURNING RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks.
IMPORTANT SERVICE SAFETY PRECAUTION
(Continued)
1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacity networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
»Plug the AC cord directly into a 120 volt AC outlet,
(Do not use an isolation transformer for this test).
»Using to clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as electrical conduit or electrical
ground connected to earth ground.
»Use anAC voltmeter having with 5000 ohm per volt,
orhigher, sensitivityto measure the ACvoltage drop
across the resistor.
AC
VOLTMETER
1.5k ohm
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS CONNECT TO
KNOWN EARTH
GROUND
SAFETY NOTICE
Many electrical and mechanical parts in television
receivers have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarilyincreased by using replacementcomponents
rated for higher voltage, wattage, etc.
Replacement parts which have special safety
characteristics are identified in this manual; electrical
components having such features are identified by
" å" and shaded areas in the Replacement Parts Lists
and Schematic Diagrams.
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»Connectthe resistor connectionto all exposedmetal
parts having a return to the chassis
(antenna, metal cabinet, screw heads, knobs and
control shafts, escutcheon, etc.) and measure the
AC voltage drop across the resistor.
AII check must be repeated with the AC line cord
plug connection reversed. (IF necessary, a non-
polarized adapter plug must be used only for the
purpose of completing these check.)
Anycurrent measured must notexceed0.5 milliamp.
Any measurements not within the limits outlined
above are indicative of a potential shock hazard and
corrective action must be taken before returning the
instrument to the customer.
For continued protection, replacement parts must be
identical to those used in the original circuit.The use of
substitutereplacementpartswhichdonothavethesame
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.

20J-S100/100S
CJ20S10/21MJ50
4
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement
accoutumé à toute vérification de sécurité et aux conseils suivants.
AVERTISSEMENT
1. N'entreprendre aucune modification de tout circuit.
C'est dangereux.
2. Débrancher le récepteur avant toute réparation.
3. Les déversoirs thermiques à semi-conducteurs
peuvent présenter un danger de choc électrique
lorsque le réceqteur est en marche.
4. Le châssis de ce récepteur possède deux systèmes
de masse qui sont séparées par du matériel
d'isolation. Le système de masse non-isolée (sous
tension) est pour le circuit du régulateur de tension
+ B et le circuit de sortie horizontale. Le système de
masseisolée est pour les tensionsDC + B basses et
lecircuitsecondairedutransformateurhautetension.
Pour éviter tout risque d'électrocution lors de
l'entretien de ce châssis, utiliser un transformateur
d'isolation entre le cordon de ligne et la prise de
courant.
PRECAUTION: POUR LA
PROTECTION CONTINUE
CONTRE LES RISQUES
D'INCENDIE, REMPLACER LE
FUSIBLE PAR UN FUSIBLE DE
MEME TYPE 4A-125V.
4A 125V
REPARATION DU SYSTEMEAHAUTE TEN-
SION ET DU TUBE-IMAGE
Lors de la réparation de ce systéme,
supprimer la charge statique en branchant
une résistance de 10 kΩen série avec un fil
isolé (comme une sonde d'essai) entre la
mise à la terre du tube-image et le fil
d'anodel.(Le corden d'alimentationdoit être
retiré de la prise murale.)
1. Le tube image dans ce récepteur emploie une
protection intégrée contre l'implosion.
2. Par mesure de sécurité, changer le tube-image pour
un tube du même numéro de type.
3. Ne pas lever le tube-image par son col.
4. Nemanipulerletube-imagequ'enporantdeslunettes
incassables et qu'après avoir déchargé totalement
la haute tension.
LIMITES DES RADIATIONS X ET DE LA
HAUTE TENSION
1. Tout le personnel réparateur doit être instruit des
instructions et procédés relatifs aux radiations X.
Le tube-image, seule source de rayons X dons les
téleviseurs transistorisés, n'émet pourtant pas de
rayonsmesurables si la hautetensionest maintenue
à un niveau préconisé dans la section "Vérification
de la haute tension".
C'estseulement quand la haute tension estexcessive
que les rayons X peuvent entrer dans l'enveloppe
du tube-image y compris le conducteur de verre. Il
est important de maintenir la haute tension en-
dessous du niveau spécifié.
2. Il est essentiel que le réparateur ait sous la main un
voltmètreà haute tension quidoitêtrepériodiquement
étalonné.
3. La haute tension doit toujours être maintenue à la
valeur de régime -et pas plus haute. L'opération à
des tensions plus élevées peut entraîner une panne
du tube-image ou du circuit à haute tension et, dans
certaines conditions, peut entraîner une radiation
dépassant les niveaux préscrits.
4. Quand le régulateur à haute tension fonctionne
correctement, il n'y a aucun problème de radiation
X. Chaque fois qu'un châssis couleurs est réparé, la
luminosité doit être examinée bout en contrôlant la
haute tension à l'aide d'un voltmètre pour s'assurer
que la haute tension ne dépasse pas la valeur
spécifiée et qu'elle soit correctement réglée.
5. Nepas utiliser un tube-imageautrequecelui spécifié
et ne pas effectuer de modifications déconseillées
du circuit à haute tension.
6. Lors de la recherche des pannes et des mesures
d'essai sur un récepteur qui présente une haute
tension excessive, éviter de s'approcher inutilement
du récepteur.
Nepas faire fonctionnerle récepteur pluslongtemps
que nécessaire pour localiser la cause de la tension
excessive.

20J-S100/100S
CJ20S10/21MJ50
5
VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE
Avant de rendre le récepteur à l'utilisateur, effectuer
les vérifications suivantes.
»Toucheravec lasonded'essai les pièces métalliques
exposées qui présentent une voie de retour au
châssis (antenne, coffret métallique, tête des vis,
arbres de commande et des boutons, écusson, etc.)
et mesurer la chute de tension CA en-travers de la
résistance. Toutes les vérifications doivent être
refaites après avoir inversé la fiche du cordon
d'alimentation.(Sinécessaire,une prise d'adpatation
non polarisée peut être utilisée dans le but de
terminer ces vérifications.)
Tous les courants mesurés ne doivent pas dépasser
0,5 mA.
Dans le cas contraire, il y a une possibilité de choc
électrique qui doit être supprimée avant de rendre le
récepteur au client.
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
(Suite)
1. Inspectertous les faisceaux de câblespours'assurer
que les fils ne soient pas pincés ou qu'un outil ne
soit pas placé entre le châssis et les autres pièces
métalliques du récepteur.
2. Inspecter tous les dispositifs de protection comme
les boutons de commande non-métalliques, les
isolants,ledos du coffret, les couverclesoublindages
de réglage et de compartiment, les réseaux de
résistance-capacité, les isolateurs mécaniques, etc.
3. S'assurer qu'il n'y ait pas de danger d'électrocution
en vérifiant la fuite de courant, de la facon suivante:
»Brancherlecordond'alimentationdirectem-ent à une
prise de courant de 120V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).
»Al'aidededeuxfilsàpinces,brancherunerésistance
de1,5kΩ10 watts en parallèle avec un condensateur
de0,15µFen série avec toutes les pièces métalliques
exposées du coffret et une terre connue comme une
conduite électrique ou une prise de terre branchée à
la terre.
»Utiliser un voltmètre CA d'une sensibilité d'au moins
5000Ω/Vpour mesurer la chute detensionentravers
de la résistance.
AC
VOLTMETER
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS CONNECT TO
KNOWN EARTH
GROUND
SONDE D'ESSAI
AUX PIECES
METALLIQUES
EXPOSEES
BRANCHER A UNE
TERRE CONNUE
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AVIS POUR LA SECURITE
Denombreusespièces, électriques et mécaniques, dans
lestéléviseursprésententdescaractéristiquesspéciales
relativesàlasécurité, qui ne sont souventpasévidentes
à vue. Le degré de protection ne peut pas être
nécessairement augmentée en utilisant des pièces de
remplacement étalonnées pour haute tension,
puissance, etc.
Les pièces de remplacement qui présentent ces
caractéristiques sont identifiées dans ce manuel; les
piècesélectriques qui présententces particularités sont
identifiées par la marque " å" et hachurées dans la
liste des pièces de remplacement et les diagrammes
schématiques.
Pour assurer la protection, ces pièces doivent être
identiques à celles utilisées dans le circuit d'origine.
L'utilisation de pièces qui n'ont pas les mêmes
caractéristiques que les pièces recommandées par
l'usine, indiquées dans ce manuel, peut provoquer des
électrocutions, incendies, radiations X ou autres
accidents.
1.5k ohm
10W
Voltmètre CA

20J-S100/100S
CJ20S10/21MJ50
6
LOCATION OF USER'S CONTROL
(Model : 25J-S100)
POWER
POWER –
VOL + CH
?CH
>
–VOL
+
POWER
MTSSTEREO
VI
DE
OIN
L-
A
U
D
I
O
-
R
VOLUME UP/DOWN
(+) Increases sound.
(–) Decreases sound.
CHANNEL UP/DOWN
(8) Selects next higher channel.
(9) Selects next lower channel.
SENSOR AREA FOR
REMOTE CONTROL
POWER
Press →ON.
Press again →OFF.
(Model : 20J-S100)
VIDEO/AUDIO IN TERMINALS
(25J-S100: VIDEO/AUDIO terminals are
also provided on the rear.)
CH
–
VOL +
POWER
TV
POWER
Press n On.
Press again n Off.
FLASHBACK
Returns to previously viewed
channel.
VOLUME UP/DOWN
(+) Increases sound.
(–) Decreases sound.
• In menu mode, changes or
selects the TV adjustments.
MUTE
Press n Mutes sound.
Press again n Restores sound.
• CLOSED CAPTION appears
when sound is muted.
DISPLAY
Press n Displays receiving
channel for 4 seconds.
Press again n Removes display.
• Temporarily displays receiving
channel when in Closed Caption
mode.
Infrared Transmitter Window
INPUT
(20J-S100)
Press n Switch to external video
input mode.
Press again n Switch to TV mode.
(25J-S100)
Press n Switch to external video
INPUT 1 mode.
Press again n Switch to external
video INPUT 2 mode.
Press 3 times n Switch back to the
original TV mode.
See page 17.
Direct Access
Accesses any channel by the
keypad.
CHANNEL UP/DOWN
(8) Selects next higher channel.
(9) Selects next lower channel.
• See pages 15, 16 for channel
presetting.
• Moves the “ ” mark of the
MENU screen.
MENU
Press n Accesses MAIN MENU.
Press again n Exits MAIN MENU.

20J-S100/100S
CJ20S10/21MJ50
7
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdriver or TV alignment tools.
(2) Before performing adjustment, TV set must be on at least 15 minutes.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within safe
and efficient design limitations as specified checks
should be as follows:
1. Connect an accurate high voltage meter between
ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 120VAC
line voltage, with strong air signal or properly tuned
in test signal.
3. Set service mode on (See next page.),Service
No.S19 and Bus data "01" (Y-mute on).
4. Thevoltage should be approximately26.5kV(at zero
beam).
Ifa correct readingcannotbeobtained,check circuitry
for malfunctioning components. After the voltage
test,make Y-mute off (normal mode).
CIRCUIT PROTECTION
The receiver is protected by a 4.0A fuse (F701),
mounted on PWB-A, wired into one side of the AC
line input.
X-RADIATION PROTECTOR CIRCUIT
TEST
1. After service has been performed on the
horizontal deflection system, high voltage
system, B + system, test the X-Radiation
protection circuit to ascertain proper operation
as follows:
1) Apply 120V AC using a variac transformer for
accurate input voltage.
2) Allow for warm up and adjust all customer controls
for normal picture and sound.
3) Select a local channel.
4) Connect a digitalvoltmeter to TP653 andmake sure
that the voltmeter reads 21.5±1.5V.
5) Apply external 26.8V DC at TP653 by using an
external DC supply, TV must be shut off.
6) To reset the protector, unplug theAC cord and make
ashortcircuit betweenTP651 andTP652.Nowmake
sure that normal picture appears on the screen.
7) If the operation of the horizontal oscillator does not
stopin step5, the circuit must be repaired before the
set is returned to the customer.

20J-S100/100S
CJ20S10/21MJ50
8
1. Service mode -
Beforeputting unit intothe service mode,check, that
customer adjustments are in the normal mode. use
the reset function in the video adjust menu to ensure
customer controls are in their
2. Service number selection
Once in the service mode, press the channel up or
channel down button on the remote transmitter or at
the set. the service adjustment number will vary in
increments of one, from "S01" to M05.
Select the item you wish to adjust.
3. Data number selection
Press the volume up or down button to adjust the
data number.
To enter the service mode .
While Pressing the Vol-up and Ch- up buttons at once,
plug the AC cord into a wall socket.Now the TV set is
switched on and enters the service mode.
To exit the service mode, shut the television off by
pressing the power button.
For adjustments of this model, the bus data is convered to various analog signals by the D-A converter circuit.
Note: There are still a few analog adjustments in this series such as focus and master screen voltage.
Follow the steps below whenever service adjustment is required. See Figure "B" to determine if service adjust-
ments are required.
Vertical-size adjustment
1. Have unit receive a good local channel.
2. Entertheservice mode and select service adjustment
"S09".
3. While observing the top and bottom of the screen,
adjust "S09" data value to proper vertical size .
Vertical phase adjustment
1. Entertheservice mode and select service adjustment
"S06".
2. Adjust data value to "00"~"03" so that picture is
approximate center.
Note: Thismust be set "00"~"03" whenadjust another
data retrace line will be appear.
"Horizontal position adjustment
1. Have unit receive a good local channel.
2. Entertheservice mode and select service adjustment
"S07".
3. Adjust "S07" data value so that picture is centered.
Figure B.
S01 D:00
02S01 55
DATA NUMBER
CHANNEL
SERVICE ADJUSTMENT
NUMBER

20J-S100/100S
CJ20S10/21MJ50
9
S01 PICTURE 55 00-7F
S02 TINT 46 00-7F
S03 COLOR 32 00-7F
S04 BRIGHTNESS 40 00-7F
S05 SHARPNESS 28 00-3F Must be set to “24”
S06 VERTICAL PHASE 00 00-07
S07 HORIZONTAL PHASE 12 00-1F
S08 RF-AGC 2A 00-3F
S09 VERTICAL AMP 20 00-3F
S10 VCO 2C 00-7F
S11 R CUT-OFF 00 00-FF
S12 G CUT -OFF 00 00-FF
S13 B CUT-OFF 00 00-FF
S14 G GAIN 7F 00-FF
S15 B GAIN 7F 00-FF
S16 TRAP(3.58MHz) 00 00 or 01 Must be set to “00”
S17 BALANCE 20 00-3F Must be set to “20”
S18 C.C.POSITION 18 00-7F
S19 Y-MUTE 00 00,01,03 00=NORMAL, 01=no “Y, 03=NO VERTICAL”
OP OPTION (Set to each mode ) 00-7E Must be set to “9”
M01 MTS LEVEL 0A 00-FF
M02 STEREO-VCO 20 00-3F
M03 FILTER 1C 00-3F
M04 LOW SEPARATION 20 00-3F
M05 HIGH SEPARATION 1B 00-3F
SERVICE
NUMBER DATA ADJUSTMENT CONTENTS
ADJUSTMENT ITEM RANGE
Holding down both the CH UP/DOWN keys on the TV set at service mode for more then 2 seconds will automatically
write the above initial values into IC2101.
NECESSARY UNNECESSARY
ADJUSTMENT NOTES
PART REPLACED
IC2001
The adjustment is needed to compensate for
characteristics of parts including IC201.
Data is stored in IC2101.
Adjust items related to picture tube only.
Holding down both the CH UP/DOWN keys on the TV set
at service mode for more than 2 seconds will automatically
write the above initial values into IC2101.
INITIAL VALUE
X
X
X
X
IC201
IC2101
CRT
IC3001 XAdjust items related to MTS only (M01~M05).
Table - B
Table - A

20J-S100/100S
CJ20S10/21MJ50
10
ËË
ËË
Ë adjustment
VCO Adjustment
1. Connecta digital voltmeter between pin (44)ofIC201
and ground.
2. Select a good local channel.
3. Enter the service mode. select adjustment "S10".
4. Adjust the data so that digital voltmeter shold read
2.2V
5. Adjustment is complete, remove the volt-meter,
return to "normal" mode.
RF AGC Adjustment
1. Have unit receive a good local channel.
2. Entertheservicemodeandselectserviceadjustment
"S08".
3. Set the data value to point where no noise or beat
appears.
4. Select another channel to confirm that no noise or
beat appears.
NOTE 1: You will have to come out of the service
mode to select another channel.
NOTE 2: Settingthedatato "00" will pro-duce a black
raster.
Screen adjustment
1. Connect a digital voltmeter between TP852 and
TP853 on the CRT socket PWB.
Note: These test points may not be provided.
Then connect the voltmeter to both ends of R852
located near Q852 on the foil side.
2. Select a good local channel.
3. Entertheservicemodeandselectserviceadjustment
“S03” and set the data value to “00” to set the color
level to minimum.(Record original data code under
adjustment“S03”before changing) You may skipthis
step if you selected a B/W picture or monoscope
pattern.
4. Select service adjustment “S19” and adjust the data
value to “01” this turn off the luminance signal (Y-
mute).
5. Select service adjustment "S04" and adjust data
value to obtain 0.17 volts on the digital voltmeter.
6. Adjust the master screen cotrol untill raster darkens
to the point where raster is barely seen.
7. Adjust service adjustments "S11" red,"S12" green
and "S13" blue to obtain a good grey scale with
normal whites at low brightness level.
8. Select service adjustment “S19” and reset data to
“00”.
Select service adjustment “S03” and reset data to
obtain normal color level.
9. Remove digital voltmeter.
Reset master screen cotrol to obtain normal
brightness range.
White balance adjustment
1. Have unit receive a good local channel.
2. Enter the service mode. select service adjustment
"S03" and set to "00" ( minimum color). "S03" does
not haveto be adjusted ifyouselected a B/Wpicture
or monoscope pattern.
3. Alternately adjust service adjustment data of "S14"
and"S15" untill a goodgrey scale withnormal whites
is obtained.
4. Select service adjustment "S03" and adjust data to
obtain normal color level.
Sub-picture adjustment
1. Have unit receive a good local channel.
2. Make sure the customer picture control is set to
maximum.
3. Entertheservicemodeandselectserviceadjustment
"S01".
4. Adjust the data value to achieve normal contrast
range.
Sub-Tint Adjustment
1. Have unit receive a good local channel.
2. Set customer tint control to center of it's range.
3. Entertheservicemodeandselectserviceadjustment
"S02".
4. Adjust"S 02" data valuetoobtain normal fleshtones.
Sub-color adjustment
1. Have unit receive a good local channel.
2. Makesure the customer colorcontrol is set tocenter
position .
3. Entertheservicemodeandselectserviceadjustment
"S03".
4. Adjust "S03"data value to obtain normal color level.
Sub-brightness adjustment
1. Have unit receive a good local channel.
2. Make sure the customer brightness control is set to
center position.
3. Entertheservicemodeandselectserviceadjustment
"S04".
4. Adjust "S04"data value to obtain normal brightness
level.

20J-S100/100S
CJ20S10/21MJ50
11
Caption position adjustment (horizontal)
1. Have unit receive a good local channel.
2. Entertheservicemodeandselectserviceadjustment
"S18".
3. A black text box appears on the screen (see Figure
C ) .
4. Adjust"S18" data valueso that textbox is positioned
in the center of the screen.
Figure C.
3.58MHz trap adjustment
1. Have unit receive a good local channel.
2. Enterthe service mode and select service adjustment
"S16" .
3. This is a two position adjustment, "00"is ON , "01" is
OFF.
4. Adjust data value to "00" for normal viewing.
Sharpness and Audio balance adjust-
ments
1. Have unit receive a good local channel.
2. Enter the service mode and select "S05" for
sharpness and "S17" for balance.
• Sharpness adjustments
3. Adjust data value to "24" (center of data range) for
sharpness adjustment.
• Audio balance adjustments
4. Adjust data value to "20" (center of data range) for
Audio balance adjustment.
5. Receive the following composite stereo signal2.
Stereo signal :30% modulation , left channel only,
noise reduction on, 3kHz.
6. Enter the service mode and select the service
adjustment "M05".
7. Adjust the data until theAC voltage reading of the
rms voltmeter is minimum.
8. Take the above steps 1 thru 8 again for fine
adjustment.
MTS level adjustment
1. Feed the following monaural signal to pin (14) of
IC3001.
Monaural signal: 300Hz,245mVrms
2. Connect the rms voltmeter to pin (39) of IC3001.
3. Enter the service mode and select the service
adjustment "M01".
4. Adjust the data so that the rms voltmeter should take
the reading below. Spec:490 ±10mVrms.
Stereo VCO adjustment
1. Keep the unit in no-signal state.
2. Connectthe frequency counter to pin (39) ofIC3001.
3.Connecta capacitor (100µF, 50V)inbetween positive
(+) side of C3005 and ground.
4. Enter the service mode and select the service
adjustment "M02".
5. Adjustthe data so thatfrequencycountershould take
the reading below.Spec:62.94 ±0.75kHz
Filter adjustment
1. Feed the following stereo pilot signal to pin (14) of
IC3001.Stereo pilot signal:9.4kHz,600mVrms.
2. Enter the service mode and select the service
adjustment "M03".
3. Adjust the data at the point where "OK" appears on
the screen. The "OK" represents the approximate
center of the adjustable range of the data.
Separation Adjustment
1. Connect the rms voltmeter to pin (39) of IC3001.
2. Receive the following composite stereo signal 1.
Composite stereo signal: 30% modulation, left
channel only, noise reduction on, 300Hz.
3. Enter the service mode and select the service
adjustment "M04".
4. Adjust the data until the AC voltage reading of the
rms voltmeter is minimum.

20J-S100/100S
CJ20S10/21MJ50
12
DESCRIPTION OF SCHEMATIC DIAGRAM
WAVEFORM MEASUREMENT CONDITIONS:
1. Photographs taken on a standard gated color bar
signal, the tint setting adjusted for proper color. The
wave shapes at the red, green and blue cathodes of
the picture tube depend on the tint, color level and
picture control.
2. indicates waveform check points (See chart,
waveforms are measured from point indicated to
chassis ground.)
NOTE:
1. The unit of resistance "ohm" is omitted (K:1000
ohms, M:1 Meg ohm).
2. All resistors are 1/8 watt, unless otherwise noted.
3. All capacitors are µ F, unless otherwise noted P:
µµ F.
4. (G) indicates ±2% tolerance may be used.
5. indecates line isolated ground.
6. indecates hot ground.
VOLTAGE MEASUREMENT CONDITIONS:
1. All DC voltages are measured with DVM connected
between points indicated and chassis ground, line
voltage set at 120V AC and all controls set for
normal picture unless otherwise indicated.
2. All voltages measured with 1000 µ V B & W or Color
signal.
å AND SHADED ( ) COMPONENTS
= SAFETY RELATED PARTS.
ç MARK= X-RAY RELATED PARTS.
DRGANNES MARQUES å ET HACHRES ( ):
PIECES RELATIVES A LA SECURITE.
MARQUE ç : PIECS RELATIVE AUX RAYONS X.
This circuit diagram is a standard one, printed circuits
may be subject to change for product improvement
without prior notice.
WAVE FORMS

20J-S100/100S
CJ20S10/21MJ50
13
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123456
CHASSIS LAYOUT

20J-S100/100S
CJ20S10/21MJ50
14
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123456
BLOCK DIAGRAM

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123456789101112
20J-S100/100S
CJ20S10/21MJ50 20J-S100/100S CJ20S10/21MJ50
15 16
SCHEMATIC DIAGRAM :CRT Unit

20J-S100/100S
CJ20S10/21MJ50 20J-S100/100S CJ20S10/21MJ50
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SCHEMATIC DIAGRAM: MAIN Unit: 20J-S100, 21MJ50, CJ20S10
IX2701CEN1 – 20JS100/CJ20S10
IX2573CE – 21MJ50
L701
20J-S100/21M50
CILF0235CE
CILF0087CE
CILF0029PE
CJ20S10
CILF0090CE
*
*

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20J-S100/100S
CJ20S10/21MJ50 20J-S100/100S CJ20S10/21MJ50
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SCHEMATIC DIAGRAM: MAIN Unit: 20J-S100S

20J-S100/100S
CJ20S10/21MJ50 20J-S100/100S CJ20S10/21MJ50
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PRINTED WIRING BOARD ASSEMBLIES: 20J-S100, 21MJ50, CJ20S10
PWB-B:CRT Unit (Wiring Side)
PWB-E:MTS Unit (Wiring Side)
PWB-A:MAIN Unit (Wiring Side)

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123456789101112
20J-S100/100S
CJ20S10/21MJ50 20J-S100/100S CJ20S10/21MJ50
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PWB-B:CRT Unit (Chip Parts Side)
PWB-E:MTS Unit (Chip Parts Side)
PWB-A:MAIN Unit (Chip Parts Side)

20J-S100/100S
CJ20S10/21MJ50 20J-S100/100S CJ20S10/21MJ50
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PWB-B:CRT Unit (Wiring Side)
PWB-A:MAIN Unit (Wiring Side)
PRINTED WIRING BOARD ASSEMBLIES: 20J-S100S
PWB-E:MTS Unit (Wiring Side)