SHARP 27R-S480, CR27S48 Service Manual
27R-S480
CR27S48
SERVICE MANUAL
S71X427R-S480
COLOR TELEVISION
Chassis No. MS-B
27R-S480
MODELS
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.
CR27S48
CONTENTS
Page
» ELECTRICAL SPECIFICATIONS .........................................................................................................1
» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2
» LOCATION OF USER'S CONTROL .....................................................................................................6
» INSTALLATION AND SERVICE INSTRUCTIONS................................................................................7
» SERVICE ADJUSTMENT ...................................................................................................................11
» CHASSIS LAYOUT .............................................................................................................................14
» BLOCK DIAGRAM ..............................................................................................................................15
» SCHEMATIC DIAGRAMS...................................................................................................................16
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................27
» REPLACEMENT PARTS LIST ............................................................................................................32
» PACKING OF THE SET......................................................................................................................43
ELECTRICAL SPECIFICATIONS
POWER INPUT..................................................... 120V AC 60 Hz
POWER RATING .................................................................. 126W
PICTURE SIZE ........................................... 2,187cm2 (339sq 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 .............. 3.0W + 3.0W (at 10% distortion and
Dual CH Operate)
SPEAKER
SIZE ..........................................................9 x 5 cm oval (2 pcs.)
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.)
Specifications are subject to change without
prior notice.
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
27R-S480
CR27S48
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be performed only by qualified service technicians who are
thoroughly familiar with all safety checks and the 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
which are separated by insulating material. The nonisolated (hot) ground system is for the B+ voltage
regulator circuit. The isolated ground system is for
the low B+ DC voltages 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
4A 125V
ONLY WITH SAME TYPE 4A125V FUSE.
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 picture 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 VOLTA GE LIMITS
1. Be sure all service personnel are aware of the
procedures and instructions covering X-radiation. The
only potential source of X-ray in current solid state
TV receivers is the picture tube. However, the picture
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 Xradiation 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. High voltage should always be kept at the rated 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. When the high voltage regulator is operating properly
there is no possibility of an X-radiation problem. 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 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. When trouble shooting and taking test measurements
on a receiver with excessive high voltage, avoid being
unnecessarily close to the receiver.
Do not operate the receiver longer than is necessary
to locate the cause of excessive voltage.
2
2
2
2
IMPORTANT SERVICE SAFETY PRECAUTION
1.5k ohm
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
(Continued)
27R-S480
CR27S48
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks.
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
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 an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure the AC voltage drop
across the resistor.
• 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 line cord
plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the
purpose of completing these check.)
Any current measured must not exceed 0.5 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.
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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
necessarily increased 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.
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For continued protection, replacement parts must be
identical to those used in the original circuit. The use of
substitute replacement parts which do not have the same
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
3
27R-S480
CR27S48
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
Ë
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 a deux systèmes de mise
à la terre qui sont séparés par un matériau isolant.
Le système de mise à la terre non-isolée (chaud) est
pour le circuit du régulateur de tension +B et le circuit
de sortie horizontale. Le système de mise à la terre
isolé est pour les basses tensions C. C. +B et le circuit
secondaire du transformateur de haute tension.
PRECAUTION:POUR LA
PROTECTION CONTINUE
CONTRE LES RISQUES
4A 125V
D'INCENDIE, REMPLACER LE
FUSIBLE P AR UN FUSIBLE DE
MEME TYPE 4A-125V.
REPARA TION DU SYSTEME A HA UTE TENSION ET DU TUBE-IMAGE
Lors de la réparation de ce systéme,
supprimer la charge statique en branchant
une résistance de 10 k en série a vec un fil
isolé (comme une sonde d'essai) entre la
mise à la terre du tube-image et le fil
d'anodel. (Le cor den d'alimentation doit être
retiré de la prise murale.)
1. Il est à noter que le tube-image de ce récepteur est
intégralement protégé 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. Ne manipuler le tube-image qu'en porant des 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
rayons mesurables si la haute tension est maintenue
à un niveau préconisé dans la section "Vérification
de la haute tension".
C'est seulement quand la haute tension est excessive
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
voltmètre à haute tension qui doit être périodiquement
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. Ne pas utiliser un tube-image autre que celui 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.
4
27R-S480
2
2
CR27S48
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
(Suite)
VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE
Avant de rendre le récepteur à l'utilisateur , effectuer
les vérifications suivantes.
1. Inspecter tous les faisceaux de câbles pour s'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, le dos du coffret, les couvercles ou blindages
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:
» Brancher le cordon d'alimentation directem-ent à une
prise de courant de 120V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).
» A l'aide de deux fils à pinces, brancher une résistance
de 1,5 k 10 watts en parallèle avec un condensateur
de 0,15µF en 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
5000 /V pour mesurer la chute de tension en travers
de la résistance.
» T oucher avec la sonde d'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. (Si
nécessaire, 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.
Voltmètre CA
1.5k ohm
10W
0.15µF
SONDE D'ESSAI
AUX PIECES
METALLIQUES
EXPOSEES
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BRANCHER A UNE
TERRE CONNUE
AVIS POUR LA SECURITE
De nombreuses pièces, électriques et mécaniques, dans
les téléviseurs présentent des caractéristiques spéciales
relatives à la sécurité, qui ne sont souvent pas 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
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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.
5
27R-S480
CR27S48
LOCATION OF USER'S CONTROL
Front Panel
POWER
Press → On.
Press again → Off.
MENU.
Press → Accesses MAIN
MENU.
Press again → Exits MAIN
MENU.
Basic Remote Control Functions
POWER
Press → On.
Press again → Off.
REMOTE KEYPAD
Accesses any channel from keypad.
FLASHBACK
Returns to previous channel.
PERSONAL PREFERENCE
With the Personal Preference buttons,
you can program your favorite
programs by using the 4 categories A,
B, C and D. The channels can be
accessed quickly by using these
buttons.
VOLUME UP/DOWN
(+) Increases sound.
(–) Decreases sound.
• In menu mode, changes or selects
the TV adjustments.
MENU
Press → Accesses MAIN MENU.
Press again → Exits MAIN MENU.
CATV/DVD-TV/VCR MODE
SELECT SWITCH
In TV/VCR position, sends power and
channel select commands (Channel
up/down and Random Access b uttons)
to the TV and VCR control.
In CATV/DVD position, sends power
and channel select commands to a
cable TV converter and DVD control.
DVD/VCR CONTROL
SENSOR AREA FOR
REMOTE CONTROL
POWER
TV
DVD
VCR
DISPLAY
1 2 3
4 5 6
7 8 9
FLASHBACK
ENTER
0
PERSONAL PREFERENCE
A B C D
CH
VOL
—
CH
MENU MUTE
CATV TV
DVD VCR
REW PLAY FF
PA USE
STOP REC
PIP
SWAP FREEZE MOVE SELECT
TV • CATV • VCR • D VD
100
VOL
CH/SKIP
INPUT
+
VIDEO/AUDIO TERMINALS
IN 2
(INSIDE DOOR)
CHANNEL UP/DOWN
( ) Selects next higher channel.
'
( ) Selects next lower channel.
"
• Press both at the same time to
access the MAIN MENU screen.
VOLUME UP/DO WN
(+) Increases sound.
(–) Decreases sound.
Infrared Transmitter Window
DISPLAY
Press → Displays receiving channel for
four seconds.
Press again → Removes display.
• Temporarily displays receiving
channel when in Closed Caption
mode.
INPUT
Press → Switch to external video
INPUT 1 mode.
Press 2 times → Switch to external video
INPUT 2 mode.
Press 3 times → Switch to external
COMPONENT mode.
Press 4 times → Switch back to the
original TV mode.
ENTER
Used in some instances where a Cable
Converter Box requires an “enter”
command after selecting channels,
when using the REMOTE KEYPAD
button.
CHANNEL UP/DOWN
'
) Selects next higher channel.
(
) Selects next lower channel.
(
"
•
Moves the “»” mark of the MENU
screens.
MUTE
Press → Mutes sound.
Press again → Restores sound.
• CLOSED CAPTION appears when
sound is muted.
PIP FUNCTION
With the VIDEO inputs, you can watch
two pictures at the same time.
6
27R-S480
CR27S48
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.
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 v oltage 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 TP651 and make sure
that the voltmeter reads 13.2 ±0.7V.
5. Apply external 16.3V DC at TP651 by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and plug
the AC cord power on. Now make 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 VOLT A GE 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
line voltage, with a strong air signal or a properly tuned
in test signal.
3. Enter the service mode and select the service
adjustment "V18" and Bus data "01" (Y -mute on, CRT
Cut Off).
4. The voltage should be approximately 29.0kV (at zero
beam).
If a correct reading cannot be obtained, check circuitry
for malfunctioning components. After the voltage test,
make Y-mute off to the normal mode.
7
27R-S480
CR27S48
For adjustments of this model, the bus data is conver ted 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 service 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 Chdown button on the remote controller or at the set.
The service adjustment number will vary in
increments of one, from "V01" to "P08". Select the
item you wish to adjust.
3. Data number selection
Press the Vol-up or V ol-down button to adjust the data
number.
DATA NUMBER
SERVICE ADJUSTMENT NUMBER
To enter the ser vice mode and exit service mode.
To enter the service mode manually just press and hold
the Vol-down and Ch-up buttons at the same time, 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.
CHANNEL
V01
Figure A.
55(085)
02
8
27R-S480
CR27S48
SERVICE
NUMBER
V01 PICTURE 03 0-15(00h-0Fh)
V02 TINT 3E 0-127(00h-7Fh)
V03 COLOR 2D 0-127(00h-7Fh)
V04 SUB-COLOR 10 0-31(00h-1Fh) Must be set to "10"
V05 BRIGHT 4D 0-127(00h-7Fh)
V06 R CUT-OFF 40 64-255(40h-FFh)
V07 G CUT-OFF 40 64-255(40h-FFh)
V08 B CUT-OFF 40 64-255(40h-FFh)
V09 G DRIVE 40 0-127(00h-7Fh)
V10 B DRIVE 40 0-127(00h-7Fh)
V11 SHARP 14 0-63(00h-3Fh) Must be set to "1E"
V12 N PHASE 01 0-3(00h-03h) Must be set to "01"
V13 DC RESTORATION 00 0-3(00h-03h) Must be set to "00"
V14 BLACK STRETCH 03 0-3(00h-03h) Must be set to "03"
V15 ABL START POINT 03 0-3(00h-03h) Must be set to "03"
V16 ABL GAIN 02 0-3(00h-03h) Must be set to "02"
V17 γ POINT 00 0-3(00h-03h) Must be set to "00"
V18 Y-MUTE/V-STOP 00 0-2 "00"=Normal, "01"=No-Y, "02"=No-Y & No-Vertical
V19 ENERGY SAVE 28 0-63(00h-3Fh) Must be set to "28"
V20 RTONE-G F6 0-255(00h-FFh) Must be set to "F6"
V21 RTONE-B F6 0-255(00h-FFh) Must be set to "F6"
V22 BTONE-G 00 0-255(00h-FFh) Must be set to "00"
V23 BTONE-B 0A 0-255(00h-FFh) Must be set to "0A"
V24 LOW-G F7 0-255(00h-FFh) Must be set to "F7"
V25 LOW-B E8 0-255(00h-FFh) Must be set to "E8"
V26 ML-G 00 0-255(00h-FFh) Must be set to "00"
V27 ML-B F9 0-255(00h-FFh) Must be set to "F9"
V28 HIGH-G 03 0-255(00h-FFh) Must be set to "03"
V29 HIGH-B 06 0-255(00h-FFh) Must be set to "06"
V30 WPS 01 0-1 Must be set to "01"
V31 RGB CONTRAST 20 0-63(00h-3Fh) Must be set to "25"
V32 Y-DL 02 0-7(00h-07h) Must be set to "02"
V33 Y-DL-INPUT 01 0-7(00h-07h) Must be set to "01"
V34 VSM GAIN 07 0-7(00h-07h) Must be set to "07"
V35 N COMB 01 0-1 Must be set to "01"
V36 BPF/TOF-INPUT 00 0-1 Must be set to "00"
V37 CORING 00 0-1 Must be set to "00"
V38 VSM PHASE 00 0-1 Must be set to "00"
V39 COLOR γ 00 0-1 Must be set to "00"
V40 SHARP-INPUT 14 0-63(00h-3Fh) Must be set to "1E"
V41 TINT-INPUT 3E 0-127(00h-7Fh)
V42 PICTURE-COMPONENT 03 0-15(00h-0Fh)
V43 TINT-COMPONENT 10 0-31(00h-1Fh) Must be set to "10"
V44 COLOR-COMPONENT 30 0-127(00h-7Fh) Must be set to "44"
V45 BRIGHT-COMPONENT 4A 0-127(00h-7Fh)
V46 R CUT OFF-COMPONENT 40 64-255(40h-FFh)
V47 G CUT OFF-COMPONENT 40 64-255(40h-FFh)
V48 B CUT OFF-COMPONENT 40 64-255(40h-FFh)
V49 G DRIVE-COMPONENT 40 0-127(00h-7Fh)
V50 B DRIVR-COMPONENT 40 0-127(00h-7Fh)
V51 SHARP COMPONENT 14 0-63(00h-3Fh) Must be set to "1E"
V52 N PHASE-COMPONENT 01 0-3(00h-03h) Must be set to "01"
V53 C-TRAP 00 0-1 Must be set to "00"
ADJUSTMENT ITEM
INITIAL VALUE
DATA
ADJUSTMENT CONTENTS
RANGE
R01 RF-AGC 24 0-63(00h-3Fh)
R02 PIF VCO coil –
R03 RF-AGC REF 5C 0-255(00h-FFh) Must be set to "5C"
D01 V POSITION 00 0-7(00h-07h)
D02 H POSITION 10 0-31(00h-1Fh)
D03 V SIZE 12 0-63(00h-3Fh)
D04 H SIZE 1F 0-63(00h-3Fh) Must be set to "0B"
D05 V-LINEARITY 07 0-15(00h-0Fh)
D06 V-S CORRECTION 08 0-15(00h-0Fh) Must be set to "08"
D07 EW PARABOLA 21 0-63(00h-3Fh) Must be set to "21"
D08 EW TRAPEZIUM 0E 0-31(00h-1Fh) Must be set to "0E"
D09 EW CORNER 0C 0-15(00h-0Fh) Must be set to "00"
D10 AFC GAIN 02 0-3(00h-03h) Must be set to "02"
Table - A
9
27R-S480
CR27S48
SERVICE
NUMBER
D11 V EHT 07 0-7(00h-07h) Must be set to "07"
D12 H EHT 03 0-7(00h-07h) Must be set to "03"
EX1 FAO VOLUME 24 0-50(00h-32h) Must be set to "24"
EX2 CC-POSITION 21 0-127(00h-7Fh)
EX3 INT 7A 0-255(00h-FFh) Must be set to "7A"
EX4 A-ATT 5A 0-127
OP1 OPTION1 BA 0-255(00h-FFh) Must be set to "B6" (27R-S480), "A6" (CR27S48)
OP2 OPTION2 01 0-7(00h-07h) Must be set to "09"
M01 INPUT LEVEL 09 0-15(00h-0Fh) Must be set to "09"
M02 MTS VCO 24 0-63(00h-3Fh)
M03 FILTER 1F 0-63(00h-3Fh)
M04 WIDEBAND 18 0-63(00h-3Fh)
M05 SPECTRAL 10 0-63(00h-3Fh)
P01 CONTRAST-PIP 32 0-127(00h-7Fh)
P02 TINT-PIP 29 0-63(00h-3Fh) Must be set to "29"
P03 COLOR-SAT-PIP 32 0-127(00h-7Fh)
P04 Y-OFFSET-PIP 09 0-31(00h-1Fh) Must be set to "09"
P05 HXA-PIP 0A 0-255(00h-FFh) Must be set to "0A"
P06 HADJ-PIP 00 0-15(00h-0Fh) Must be set to "00"
P07 FREE RUN-PIP 0B 0-15(00h-0Fh) Must be set to "0B"
P08 TINT-PIP-INPUT 24 0-63(00h-3Fh) Must be set to "24"
ADJUSTMENT ITEM
INITIAL VALUE
DATA
ADJUSTMENT CONTENTS
RANGE
Table - A
Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will
automatically write the above initial values into IC2102.
PART REPLACED
IC2001
IC201
IC2102
CRT
IC3001
IC1801
NECESSARY UNNECESSARY
ADJUSTMENT
X
X
X
X
X
NOTES
X
Data is stored in IC2102.
The adjustment is needed to compensate for characteristics of parts
including IC201 and MTS level (M01).
Holding down both the VOL-up and CH-up buttons on the TV set in
the service mode for more than 2 seconds will automatically write the
above initial values into IC2102. Then perform a complete adjustment.
Adjust items related to picture tube only.
Adjust items related to MTS only (M01~M05).
Adjust items related to P-IN-P only (P01~P08).
Table - B
10
SERVICE ADJUSTMENT
27R-S480
CR27S48
VCO Adjustment
1. Connect a digital voltmeter between pin (55) of IC201
and ground.
2. Receive a good local channel.
3. Enter the service mode and select the service
adjustment "R02".
4. Adjust T201 so that digital voltmeter reads
2.5±1.0VDC.
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 "R01".
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" will produce a black
raster.
Screen Adjustment
White Balance Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "V03" and set to "00" (minimum
color)(Record original data code under adjustment
"V03" before changing). "V03" does not have to be
adjusted, if you selected a B/W picture or monoscope
pattern.
3. Alternately adjust the service adjustment data of "V09"
and "V10" until a good grey scale with normal whites
is obtained. (RF Input)
4. For component input, the data value of "V49" and
"V50" is adjusted to follow the data value of "V09"
and "V10" respectively.
5. Select the service adjustment "V03" and reset data
to obtain normal color level.
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 "V01".
4. Adjust the data value to achieve normal contrast
range.
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "V03" and set the data value to "00" to
set the color level to minimum. (Record original data
code under adjustment "V03" before changing) You
may skip this step, if you selected a B/W picture or
monoscope pattern.
3. Select the service adjustment "V18" and adjust the
data value to "01", this turn off the luminance signal
(Y-mute).
4. Adjust the master screen control until the raster
darkens to the point where raster is barely seen.
5. Adjust the service adjustments "V06" red, "V07" green
and "V08" blue to obtain a good grey scale with
normal whites at low brightness level.
6. Select the service adjustment "V18" and reset data
to "00". Select the service adjustment "V03" and reset
data to obtain normal color level.
7. For component input, the data value of "V46" red,
"V47" green and "V48" blue is adjusted to follow the
data value of "V06", "V07" and "V08" respectively.
8. Reset the master screen control to obtain normal
brightness range.
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 "V02".
4. Adjust "V02" data value to obtain normal flesh tones.
5. Input same data to "V41".
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 service adjustment
"V04".
4. Adjust "V04" data value to obtain normal color level.
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 "V05".
4. Adjust "V05" data value to obtain normal brightness
level.
11
27R-S480
CR27S48
Vertical-Size and Linearity Adjustments
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "D03" for V-size.
3. Adjust the "D03" bus data to get the proper V-size.
4. For V-linearity adjustment, select data bus "D05" and
adjust to get the proper vertical linearity.
Note: Aging for 10 min before adjustment. After the
adjustment of V-center and V-size, readjustment for this V-line.
Vertical Phase Adjustment
1. Enter the service mode and select the service
adjustment "D01".
2. Adjust "D01" data value so that picture is centered.
Horizontal Position Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "D02".
3. Adjust "D02" data value so that picture is centered.
Caption Position Adjustment (Horizontal)
Other Adjustments
1. Enter the service mode.
2. Adjust the following data values as listed below.
SERVICE ADJUST DATA(Hex)
POSITION ITEM 27R-S480 CR27S48
OP1 OPTION1 B6 A6
OP2 OPTION2 09 09
1. Receive a good local channel.
2. Enter the service mode and select the service
adjustment "EX2".
3. A black text box appears on the screen. (see
B.
below)
4. Adjust "EX2" data value so that text box is positioned
in the center of the screen.
Figure
Figure B.
12
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