Sharp CL20S10 User manual

1
20L-S100S
CL20S10, 21ML50
COLOR TELEVISION
Chassis No. SN-80
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.
S59G320L-S100
»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 ........................................................................................ 19
»REPLACEMENT PARTS LIST ........................................................................................................... 22
»PACKING OF THE SET ..................................................................................................................... 29
Page
SHARP CORPORATION
CONTENTS
SERVICE MANUAL
POWER INPUT ................................................... 120 V AC 60 Hz
POWER RATING ....................................................................88 W
PICTURE SIZE ............................................1,240cm2 (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 RATING.................... 1.3W + 1.3W (at 10% distortion)
ELECTRICAL SPECIFICATIONS
SPEAKER
SIZE ...................................................................... 8 cm (Round)
VOICE COIL IMPEDANCE...............................8 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ....................................................75 ohm Unbalanced
TUNING RANGES
VHF-Channels .............................................................. 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels .......................................................... 1 thru 125
(EIA, Channel Plan U.S.A.)
MODELS
20L-S100S
CL20S10, 21ML50
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
Specifications are subject to change without
prior notice.

2
20L-S100S
CL20S10, 21ML50
IMPORTANT SERVICE SAFETY PRECAUTION
Serviceworkshouldbe performed only by qualifiedservicetechnicianswhoare thoroughly
familiar with all safety checks and the servicing guidelines which follow:
4A 125V
SERVICING OF HIGH VOLTAGE SYSTEM
AND PICTURE TUBE
When servicing the high voltage system,
remove the static charge by connecting a
10k ohm resistor in series with an insulated
wire (such as a test probe) between the pic-
ture tube ground and the anode lead. (AC
line cord should be disconnected from AC
outlet.)
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.
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
TVreceivers is the picture tube.However, thepicture
tube does not emit measurable X-Ray radiation, if
the 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 the glass material.
The important precaution is to keep the high voltage
below the maximum level specified.
2. It is essential that servicemen 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 at therated value
–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 in exceeding of desirable levels.
4. Whenthehighvoltage regulator is operating properly
thereis no possibility of an X-radiation problem.Every
timeacolor chassis is serviced, the brightness should
be tested while monitoring the high voltage with a
meter to be certain that the high voltage does not
exceed the specified value and that 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
ona receiver with excessive high voltage, avoidbeing
unnecessarily close to the receiver.
Do not operate the receiver longer than is necessary
to locate the cause of excessive voltage.
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
whichare separated by insulatingmaterial. The non-
isolated (hot) ground system is for the B+ voltage
regulatorcircuit and the horizontal outputcircuit. The
isolatedgroundsystemisforthelowB+ 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.
CAUTION: FOR CONTINUED
PROTECTION AGAINST A
RISK OF FIRE, REPLACE
ONLY WITH SAME TYPE 4A-
125V FUSE.

3
20L-S100S
CL20S10, 21ML50
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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 replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these 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.
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 two clip leads, connect a 1.5k ohm, 10 watt
resistorparalleled by a 0.15µF capacitor in series with
all exposed metal cabinet parts and a known earth
ground,suchaselectricalconduitorelectricalground
connected to earth ground.
•Use anAC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure theAC voltage drop
across the resistor.
For continued protection, replacement parts must be
identical to those used in the original circuit. The use of
substitutereplacement parts which do not have thesame
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks.
•Connect the resistor connection to all exposed metal
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 checks must be repeated with the AC ine 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 not exceed0.5 milliamp.
Any measurements not within the limits outlined
above indicate of a potential shock hazard and
corrective action must be taken before returning the
instrument to the customer.
1.5k ohm
10W
0.15µF
TEST PROBE
CONNECT TO
KNOWN EARTH
GROUND
TO EXPOSED
METAL PARTS
AC
VOLTMETER

4
20L-S100S
CL20S10, 21ML50
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
masse isolée est pour les tensions DC 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.
4A 125V
PRECAUTION: POUR LA
PROTECTION CONTINUE
CONTRE LES RISQUES
D'INCENDIE, REMPLACER LE
FUSIBLE PAR UN FUSIBLE DE
MEME TYPE 4A-125V.
REPARATION DU SYSTEMEA HAUTE 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'alimentation doit 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'enporantdes lunettes
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 haute tensionest maintenue
à un niveau préconisé dans la section "Vérification
de la haute tension".
C'estseulement quand la haute tensionestexcessive
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 tensionquidoitêtrepériodiquement
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. Nepasutiliser un tube-image autre quecelui 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.
Ne pas faire fonctionner le récepteur plus longtemps
que nécessaire pour localiser la cause de la tension
excessive.

5
20L-S100S
CL20S10, 21ML50
VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE
Avant de rendre le récepteur à l'utilisateur, effectuer
les vérifications suivantes.
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AVIS POUR LA SECURITE
Denombreuses pièces, électriques et mécaniques, dans
lestéléviseursprésententdescaractéristiquesspéciales
relativesàla sécurité, qui ne sont souventpas évidentes
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
pièces électriques qui présentent ces particularités sont
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
(Suite)
1. Inspectertousles faisceaux de câbles pour s'assurer
queles fils nesoient pas pincés ouqu'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,le dos du coffret,lescouverclesoublindages
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-entà une
prise de courant de 120V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).
•Al'aidededeuxfilsàpinces,brancherunerésistance
de1,5 kΩ10 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 de tensionen travers
de la résistance.
•Toucheravec la sonde d'essai lespièces 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
nonpolarisée peut êtreutiliséedansle but determiner
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.
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.
Voltmètre CA
1.5k ohm
10W
BRANCHER A UNE
TERRE CONNUE
AUX PIECES
METALLIQUES
EXPOSEES
0.15µF
SONDE D'ESSAI

6
20L-S100S
CL20S10, 21ML50
LOCATION OF USER'S CONTROL

7
20L-S100S
CL20S10, 21ML50
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
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. Receive a good local channel.
4. Connect a digital voltmeter to TP653 and make sure
that the voltmeter reads 22.2 ±1.5V.
5. Apply external 28.9V DC at TP653 by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug theAC cord and make
ashortcircuitbetweenTP651 andTP652.Nowmake
sure that normal picture appears on the screen.
7. If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
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 120V AC
linevoltage, with astrongairsignal or aproperlytuned
in test signal.
3. Enter the service mode and select the service
adjustment "S19" and Bus data "01" (Y-mute on).
4. Thevoltageshouldbe approximately,27.0kV(atzero
beam).
Ifa correct readingcannotbeobtained,checkcircuitry
formalfunctioning components. After the voltage test,
make Y-mute off to the normal mode.
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (1)When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2)Before performing adjustments, the TV set must be on at least 15 minutes.

8
20L-S100S
CL20S10, 21ML50
Figure A.
S01 02
CHANNEL
SERVICE ADJUSTMENT NUMBER
DATA NUMBER
For adjustments of this model, the bus data is converted 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 the service adjustment is required. See "Table-B" to determine, if serv-
ice adjustments are required.
1. Service mode
Before putting unit into the service mode, check that
customer adjustments are in the normal mode. Use
the reset function in the video adjustment menu to
ensure customer controls are in their proper (reset)
position.
2. Service number selection
Once in the service mode, press the Ch-up or Ch-
down button on the remote controller 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 Vol-up or down button to adjust the data
number.
To enter the service mode and exit serv-
ice mode.
While pressing the Vol-up and Ch-up buttons at the
sametime, 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, turn the television off by
pressing the power button.
55(085)
S01 D:00

9
20L-S100S
CL20S10, 21ML50
SERVICE
NUMBER DATA ADJUSTMENT CONTENTS
ADJUSTMENT ITEM RANGE
INITIAL VALUE
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 Must be set to "00" ~ "03"
S07 HORIZONTAL PHASE 12 00-1F
S08 RF-AGC 23 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 17 00-7F
S19 Y-MUTE 00 00,01,03 "00" = Normal, "01" = No-Y, "03" = No Vertical
S20 ENERGY SAVE OFFSET 20 00-3F Must be set to "23"
S21 D.D.E.OFFSET 03 00-1F Must be set to "03"
S22 OSD SETUP 00 00-03 Must be set to "00"
S23 TUNER SETUP 00 00-01 Must be set to "00"
OP OPTION 30 00-FF Must be set to "06"
M01 MTS LEVEL 0A 00-F
M02 STERO-VCO 20 00-3F
M03 FILTER 1C 00-3F
M04 LOWSEPARATION 20 00-3F
M05 HIGHSEPARATION 1B 00-3F
NECESSARY UNNECESSARY
ADJUSTMENT NOTES
PART REPLACED
IC2001
IC2101 X
CRT X
IC201 X
Data is stored in IC2101.
Adjust items related to picture tube only.
Table - A
Holdingdownboth the CH-up/down buttons onthe TV set atservice modefor more than2 secondswill automatically
write the above initial values into IC2101.
Table - B
X
The adjustment is needed to compensate for characteristics
of parts including IC201.
Holding down both the CH-up/down buttons on the TV set in
the service mode for more than 2 seconds will automatically
write the above initial values into IC2101.

10
20L-S100S
CL20S10, 21ML50
SERVICE ADJUSTMENT
VCO Adjustment
1. Connectadigital voltmeter between pin (44) of IC201
and ground.
2. Receive a good local channel.
3. Enter the service mode and select the service
adjustment "S10".
4. Adjust the data so that digital voltmeter reads 2.2V.
5. Adjustment is completed, remove the voltmeter,
return to "normal" mode.
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "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 : Setting the data to"00" willproduce a black
raster.
Screen Adjustment
1. Connect a digital voltmeter between TP852 and
TP853 on the CRT Unit.
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. Receive a good local channel.
3. Enter the service mode and select the service
adjustment "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 skip this step, if you selected a B/W picture or
monoscope pattern.
4. Select the service adjustment "S19" and adjust the
data value to "01", this turn off the luminance signal
(Y-mute).
5. Select the service adjustment "S04" and adjust data
value to obtain 0.17 volts on the digital voltmeter.
6. Adjust the master screen control until the raster
darkens to the point where raster is barely seen.
7. Adjusttheserviceadjustments"S11" red,"S12"green
and "S13" blue to obtain a good grey scale with
normal whites at low brightness level.
8. Select the service adjustment "S19" and reset data
to"00".Selecttheserviceadjustment"S03"andreset
data to obtain normal color level.
9. Removedigitalvoltmeter,andresetthemaster screen
control to obtain normal brightness range.
White Balance Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "S03" and set to "00" (minimum
color)(Record original data code under adjustment
"S03" before changing). "S03" does not have to be
adjusted,ifyouselectedaB/W picture or monoscope
pattern.
3. Alternatelyadjusttheservice adjustmentdataof"S14"
and "S15" until a good grey scale with normal whites
is obtained.
4. Select the service adjustment "S03" and adjust data
to obtain normal color level.
Sub-Picture Adjustment
1. Receive a good local channel.
2. Make sure the customer picture control is set to
maximum.
3. Enter the service mode and select the service
adjustment "S01".
4. Adjust the data value to achieve normal contrast
range.
Sub-Tint Adjustment
1. Receive a good local channel.
2. Set customer tint control to center of it's range.
3. Enter the service mode and select the service
adjustment "S02".
4. Adjust "S02" data value to obtain normal flesh tones.
Sub-Color Adjustment
1. Receive a good local channel.
2. Make sure the customer color control is set to center
position .
3. Enter the service mode and select the service
adjustment "S03".
4. Adjust "S03" data value to obtain normal color level.

11
20L-S100S
CL20S10, 21ML50
Sub-Brightness Adjustment
1. Receive a good local channel.
2. Make sure the customer brightness control is set to
center position.
3. Enter the service mode and select the service
adjustment "S04".
4. Adjust "S04" data value to obtain normal brightness
level.
Vertical-Size Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the 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. Enter the service mode and select the service
adjustment "S06".
2. Adjust data value to "00" ~ "03".
Note: This must be set "00" ~ "03" when changed
data retrace line will appear.
Horizontal Position Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "S07".
3. Adjust "S07" data value so that picture is centered.
Caption Position Adjustment (Horizontal)
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "S18".
3. A black text box appears on the screen. (see Figure
B below)
4. Adjust "S18" data value so that text box is positioned
in the center of the screen.
3.58MHz Trap Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the 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, Audio Balance, Energy Save
Offset, DDE Offset, OSD Setup, Tuner
Setup and Option Adjustments
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustments "S05" for sharpness, "S17" for balance,
"S20" for energy save offset, "S21" for DDE offset,
"S22" for OSD setup, "S23" for tuner and "OP" for
option.
»Sharpness Adjustment
3. Adjust data value to "24" (center of data range) for
sharpness adjustment.
»Audio Balance Adjustment
4. Adjust data value to "20" (center of data range) for
Audio balance adjustment.
»Energy Save Offset Adjustment
5. Adjust data value to "23".
»DDE Offset Adjustment
6. Adjust data value to "03".
»OSD Setup Adjustment
7. Adjust data value to "00".
»Tuner Setup Adjustment
8. Adjust data value to "00".
»Option Adjustment
9. Adjust data value to "06".
Figure B.

12
20L-S100S
CL20S10, 21ML50
MTS 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 reads.
490 ±10mVrms.
MTS VCO Adjustment
1. Keep the unit in no-signal state.
2. Connectthefrequency counter to pin (39)of IC3001.
3. Connect a capacitor (100µF, 50V) in between
positive(+) side of C3005 and ground.
4. Enter the service mode and select the service
adjustment "M02"
5. Adjust the data so that the frequency counter reads.
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.
5. Receive the following composite stereo signal 2.
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 the AC voltage reading of the
rms voltmeter is minimum.
8. Take the above steps 1 thru 7 again for fine
adjustment.

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20L-S100S
CL20S10, 21ML50
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CHASSIS LAYOUT
PWB-E PWB-B
PWB-A

14
20L-S100S
CL20S10, 21ML50
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BLOCK DIAGRAM

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20L-S100S
CL20S10, 21ML50
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DESCRIPTION OF SCHEMATIC DIAGRAM
NOTES:
1. The unit of resistance "ohm" is omitted.
(K=k Ω =1000 Ω , M=M Ω )
2. All resistors are 1/16 watt, unless otherwise noted.
3. All capacitors are µ F, unless otherwise noted.
(P=pF=µµF)
4. (G) indicates ±2% tolerance may be used.
5. indicates line isolated ground.
6. indicates hot ground.
VOLTAGE MEASUREMENT CONDITIONS:
1. All DC voltages are measured with DVM connected
between points indicated and chassis ground, line
voltagesetat120VACandallcontrolsset for normal
picture unless otherwise indicated.
2. All voltages measured with 1000µ V B & W or Color
signal.
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.)
å AND SHADED ( ) COMPONENTS
= SAFETY RELATED PARTS.
' MARK= X-RAY RELATED PARTS.
DRGANNES MARQUES å ET HACHRES ( ):
PIECES RELATIVES A LA SECURITE.
MARQUE ' : 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.
WAVEFORMS

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87109654321
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SCHEMATIC DIAGRAM: MAIN Unit
(DUNTK9532WEV7) 20L-S100S
(DUNTK9532WEV9) CL20S10
(DUNTK9532WEW1) 21ML50
VTST5UF78S(`1)
115B8025AM(`2)
(`1)
150
2W(VV)(`2)
(`1)
1000
16V
(`2)
(`1)
(`1)
1
2W
(NVV)
(`2)
(`1) (`1)
10k
(`2)
2.2
50V
(`2)
(20L-S100S,
21ML50)
F0090CE
(CL20S10)
`1
(20L-S100S, CL20S10)
`2
(21ML50)

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1716 1918151413121110
S
10)

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SCHEMATIC DIAGRAM: CRT and MTS MODULE Unit
2SD601AR
CRT
MTS MODULE

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PRINTED WIRING BOARD ASSEMBLIES
PWB-E: MTS MODULE Unit
(Chip Parts Side)
PWB-E: MTS MODULE Unit
(Wiring Side)
PWB-B: CRT Unit (Wiring Side) PWB-B: CRT Unit (Chip Parts Side)

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PWB-A: MAIN Unit (Wiring Side)