SHARP 20U-FS1, CU20FS1 Service Manual

20U-FS1
CU20FS1

SERVICE MANUAL

S52J320U-FS1/

COLOR TELEVISION

Chassis No. GA-2

20U-FS1

MODELS

In the interests of user-safety (Required by saf ety regulations in some countries ) the set should be restored to its
original condition and only parts identical to those specified should be used.

CU20FS1

CONTENTS

Page

» ELECTRICAL SPECIFICATIONS .........................................................................................................1

» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2

» LOCATION OF USER'S CONTROL .....................................................................................................6

» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................7

» SERVICE MODE...................................................................................................................................8

» ADJUSTMENT METHOD ...................................................................................................................13

» CHASSIS LAYOUT .............................................................................................................................28

» BLOCK DIAGRAM ..............................................................................................................................29

» SCHEMATIC DIAGRAMS ...................................................................................................................34

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................42

» REPLACEMENT PARTS LIST............................................................................................................46

» PACKING OF THE SET......................................................................................................................55

ELECTRICAL SPECIFICATIONS

POWER INPUT.....................................................AC 120 V, 60 Hz

POWER RATING .................................................................... 90W

PICTURE SIZE .......................................... 1,239 cm2 (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 ........................................2.5 W(RMS) x 2pcs

SPEAKER

SIZE ...................................................................6 x 12 cm, 2pcs

VOICE COIL IMPEDANCE ............................ 16 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.

20U-FS1
CU20FS1

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 pow er 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 and the horizontal output 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 ser vicemen 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 k ept at the rated v alue

−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 excessiv e high voltage, a void 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

0.15 F

TEST PROBE

TO EXPOSED
METAL PARTS

CONNECT TO
KNOWN EARTH
GROUND

(Continued)

20U-FS1
CU20FS1

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 A C 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 necessar y, 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

20U-FS1
CU20FS1

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 av ant 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
D'INCENDIE, REMPLACER LE

4A 125V

FUSIBLE PAR UN FUSIBLE DE
MEME TYPE 4A-125V .

REPARATION DU SYSTEME A HAUTE 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 mesur ables si la haute tension est mainten ue
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 peuv ent entrer dans l'en v eloppe 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

20U-FS1

2
2

CU20FS1

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 w atts 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 tr avers
de la résistance.

» Toucher 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

0.15 F

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

20U-FS1
CU20FS1

LOCATION OF USER'S CONTROL

Front Panel

POWER

Press → On.
Press again → Off.

SENSOR AREA FOR
REMOTE CONTROL

MENU.

Press → Accesses MAIN MENU.
Press again → Exits MAIN MENU.

VOLUME UP/DOWN

(+) Increases sound.
(–) Decreases sound.

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 Pref erence 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 buttons)
to the TV and VCR control.
In CATV/DVD position, sends power
and channel select commands to a
cable TV con verter and D VD control.

DVD/VCR CONTROL

DVD
VCR

PUSH BUTTON

DISPLAY

POWER

POWER

TV

1 2 3
4 5 6
7 8 9

FLASHBACK

PERSONAL PREFERENCE

A B C D

VOL

—

MENU MUTE

REW PLAY FF

PAUSE

TV • CATV • VCR • DVD

0

CH

CH

STOP REC

ENTER

100

CATV TV

DVD VCR

CH/SKIP

INPUT

VOL

VIDEO IN 2 L-AUDIO-R

(INSIDE DOOR)

CHANNEL UP/DOWN

(') Selects next higher channel.
(") Selects next lower channel.

Infrared T ransmitter Window

DISPLAY

Press → Displa ys 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 or COMPONENT
mode.
Press 2 times → Switch to external video
INPUT 2 mode.
Press 3 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.

Note:

• The above shaded buttons on the Remote Control glow in the dark. To use the glow-in-the-dark display on the
remote control, place it under a fluorescent light or other lighting.

• The phosphorescent material contains no radioactive or toxic material, so it is safe to use.

• The degree of illumination will vary depending on the strength of lighting used.

• The degree of illumination will decrease with time and depending on the temperature.

• The time needed to charge the phosphorescent display will vary depending on the surrounding lighting.

• Sunlight and fluorescent lighting are the most effective when charging the display.

6

20U-FS1
CU20FS1

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 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 accur ate
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 18.9 ±1.1V.

5. Apply external 24.5V DC at TP653 by using an
external DC supply, TV must be shut off.

6. To reset the protector, unplug the AC cord and mak e
a short circuit between TP651 and TP652. 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 set Y-mute ON by using
Service R/C.

4. The voltage should be approximately 28.6kV (at zero
beam).
If a correct reading cannot be obtained, check circuitry
for malfunctioning components. After the v oltage test,
make Y-mute off to the normal mode.

7

20U-FS1
CU20FS1

SERVICE MODE

Service Mode Overview

1. Service mode is entered by SERVICE key input or CH-UP +VOL-DOWN input during reset.

2. Service mode is cleared by entering SERVICE key or CH-UP +VOL-DOWN key command during service mode.

3. If key input port (SERVICE) input is LOW, then it is in service mode.

4. During key input port (SERVICE) input is LOW, clearing service mode by key input SERVICE or CH-UP + VOL­DOWN is disabled.

5. Service mode can be switched to 4 modes as follows by key input MENU;

Option mode

Adjustment mode

Setting mode

Check mode

6. AFT processing is disabled during service mode. PLL setting data is set to fo data.

7. All user data are set to default during service mode. FAO and SPEAKER user settings are off and on respectively
in service mode. Energy Save is off.

8. Sleep timer, View timer and Off timer are inactivated in Service mode.

9. Sound is muting in service mode except at Adjustment Items V20, M01, M02, M03, M04, M05, and M06.

First mode of service mode when SERVICE key is
pressed.

First mode of service mode when local key
CH-UP + VOL-DOWN is pressed after MCU reset.

8

Adjustment Mode Items

No. Item Name IC Register Range Default

V01 SUB-PICTURE 1 Chip CONTRAST 0~127 127
V02 SUB-TINT 1 Chip TINT 0~127 64
V03 SUB-COLOR 1 Chip COLOR 0~127 64
V04 SUB-BRIGHT 1 Chip BRIGHT 0~255 128
V05 SUB-SHARP 1 Chip VIDEO-TONE 0~63 32
V06 V-SHIFT 1 Chip V-SHIFT 0~7 4
V07 H-SHIFT 1 Chip H-PHASE 0~31 16
V08 RF-AGC 1 Chip RF-Delay 0~127 127
V09 V-SIZE 1 Chip V-SIZE 0~63 32
V10 PIF-VCO 1 Chip VIF-VCO 0~63 32
V11 R-CUTOFF 1 Chip R-CUTOFF 0~255 127
V12 G-CUTOFF 1 Chip G-CUTOFF 0~255 127
V13 B-CUTOFF 1 Chip B-CUTOFF 0~255 127
V14 R-DRIVE 1 Chip R-DRIVE 0~127 64
V15 B-DRIVE 1 Chip B-DRIVE 0~127 64
V16 SUB-COLOR(YUV) 1 Chip COLOR 0~127 64
V17 SUB-TINT(YUV) 1 Chip BASEBAND-TINT 0~127 64
V18 CC-POS Micron 0~255 32
V19 (Vertical mode) 1 Chip V-MUTE,SERVICE 0, 1, 2 0
V20 SUB-VOL 1 Chip A-ATT 0~127 127

V21 H-VCO 1 Chip H-VCO 0~7 4
M01 MTS-ATT MTS ATT 0~15 10
M02 MTS-VCO MTS VCO 0~63 32
M03 MTS-FILTER MTS FILTER 0~63 28
M04 MTS-WIDEBAND MTS WIDEBAND 0~63 27
M05 MTS-SPECTRAL MTS SPECTRAL 0~63 32
M06 SUB-VOL MTS VOL 0~63 63

20U-FS1
CU20FS1

9

20U-FS1
CU20FS1

Ë

SELF ADJUSTMENT

H-VCO

1. When there is H-VCO self-adjustment key input for adjustment item H-VCO, self-adjustment is performed.

2. H-FREE(1chip) is set to 1.

3. H-OUT is set by intelligent monitor output.

4. IM input is set as TIM input.

5. H-VCO(1chip) data is changed so that the number of input pulse is 125 inside 8ms interval.

6. When adjustment completed, OSD display and H-VCO self-adjustment status data of EEPROM are updated.

7. H-FREE(1chip), intelligent monitor output and IM input mode are recovered.

RF-AGC

1. When there is RF-AGC self-adjustment key input for adjustment item RF-AGC, self-adjustment is performed.

2. AGC-OUT is set by intelligent monitor output.

3. IM input is set as AD input.

4. By decreasing RF-AGC (1chip) data from current RF-AGC adjustment value to 0, AFT input voltage becomes the
maximum setting value.

5. Increase RF-AGC(1chip) data, when AFT input voltage is at (max. 0.3V) point, adjustment is completed.

6. When adjustment completed, OSD display and RF-AGC self-adjustment status data of EEPROM are updated.

7. Intelligent monitor output and IM input mode are recovered.

PIF-VCO

1. When there is PIF-VCO self-adjustment key input for adjustment item PIF-VCO, self-adjustment is performed.

2. VIF-DEF(1chip) is set to 1.

3. AFC is set by intelligent monitor output.

4. IM input is set as AD input.

5. VIF-VCO(1chip) data is changed so that input voltage becomes 2.5V.

6. When adjustment completed, OSD display and PIF-VCO self-adjustment status data of EEPROM are updated.

7. VIF-DEF(1chip), intelligent monitor output and IM input mode are recovered.

MTS-FILTER

Adjustment is performed in the center of the range when FILTER status is OK.

1. If data is changed from 0 to 63, point where NG → OK is A and point where OK → NG is B.

2. If data is changed from 63 to 0, point where NG → OK is C and point where OK → NG is D.

3. (A+B+C+D)/4 is the adjustment point.

10

Setting Mode Items

No. Item Name IC Register Range Default

F01 VideoTone-Gain (TV) 1chip V-TONE 0 / 1 0
F02 VideoTone-Gain (AV) 1chip V-TONE 0 / 1 0
F03 VideoTone-Gain(YUV) 1chip V-TONE 0 / 1 0
F04 ABCL 1chip ABCL 0 / 1 0
F05 BS 1chip BS-OFF 0 / 1 0
F06 ABCL-G 1chip ABCL-G 0 / 1 0
F07 SHP-AV OFFSET VIDEO-TONE(OFFSET) -16~+16 0
F08 SHP-YUV OFFSET VIDEO-TONE(OFFSET) -16~+16 0
F09 RGB-CLIP 1chip ExtRGB-Clip 0 / 1 0
F10 E-SAVE OFFSET CONTRAST(OFFSET) 0~63 30
F11 FAO-VOL 1chip A-ATT 0~127 120
F12 PIF-G 1chip VIF-GAIN 0~7 4
F13 Y-DELAY(TV) 1chip Y-Delay 0~7 0
F14 Y-DELAY(AV) 1chip Y-Delay 0~7 0
F15 Y-DELAY(YUV) 1chip Y-Delay 0~7 0
F16 TINT-AV OFFSET TINT(OFFSET) -32~+32 0
F17 COL-AV OFFSET COLOR(OFFSET) -32~+32 0
F18 R-DRI(R2) OFFSET R-DRI(OFFSET) -32~+32 0
F19 R-DRI(R) OFFSET R-DRI(OFFSET) -32~+32 0
F20 R-DRI(B) OFFSET R-DRI(OFFSET) -32 ~+32 0
F21 B-DRI(R2) OFFSET B-DRI(OFFSET) -32~+32 0
F22 B-DRI(R) OFFSET B-DRI(OFFSET) -32~+32 0
F23 B-DRI(B) OFFSET B-DRI(OFFSET) -32~+32 0
F24 V-FREE 1chip V-FREE 0 / 1 0
F25 GAMMA 1chip GAMMA 0~3 0
F26 TRAP(TV) 1chip TRAP-FINE 0~3 2
F27 TRAP(AV) 1chip TRAP-FINE 0~3 2
F28 H-FREE 1chip H-FREE 0 / 1 0
F29 1W(TV) 1chip V.Window 0 / 1 0
F30 1W(AV) 1chip V.Window 0 / 1 0
F31 YLPF 1chip YSW-LPF 0 / 1 1
F32 BS-D 1chip BS-DISCHARGE 0~3 0
F33 BS-C 1chip BS-CHARGE 0~3 0
F34 SL(TV) 1chip S-SLICE DOWN 0~3 0
F35 SL(AV) 1chip S-SLICE DOWN 0~3 0
F36 SL(YUV) 1chip S-SLICE DOWN 0~3 0
F37 AFC2 1chip AFC2-G 0 / 1 0
F38 VD(TV) 1chip Vsync-Det 0 / 1 0
F39 VD(AV) 1chip Vsync-Det 0 / 1 0
F40 AS(TV) 1chip Auto-Slice 0 / 1 0
F41 AS(AV) 1chip Auto-Slice 0 / 1 0
F42 AS(YUV) 1chip Auto-Slice 0 / 1 0
F43 FBP(TV) 1chip FBP Vth 0 / 1 0
F44 FBP(AV) 1chip FBP Vth 0 / 1 0
F45 FBP(YUV) 1chip FBP Vth 0 / 1 0
F46 C.Clip Level 1chip C.Clip Level 0 / 1 0
F47 PSW MTS PSW 0 / 1 0
F48 FAO-VOL MTS VOL 0~63 60
F49 CP PLL CP 0 / 1 0
F50 CC LEVEL MICRON 0
F51 OSD POS MICRON 0
F52 OFFSET-ADJ-COL 1 chip COLOR -32~32 0
F53 OFFSET-ADJ-TINT 1 chip TINT -32~32 0
F54 OFFSET-ADJ-TINT-YUV 1 chip BASEBAND-TINT -32~32 0

20U-FS1
CU20FS1

11

20U-FS1
CU20FS1

Option Mode Items

No ITEM 0 1 DEFAULT
O01 DEM0 Without DEMO With DEMO 1
O02 DOWNLOAD Without V-CHIP OP With V-CHIP OP 1
O03 V-CHIP Without V -CHIP With V-CHIP 1
O04 SPEAKER Without SPEAKER With SPEAKER 1
O05 FAO Without FAO With FAO 1
O06 P.PREF Without P.PREF With P.PREF 1
O07 UNIV+ Without UNIV+ With INIV+ 1
O08 VIEW TIMER Without VIEW TIMER With VIEW TIMER 1
O09 EZ-SETUP EZ-SETUP AUTO PRESET 1
O10 PON-CH Without POWER-ON With POWER-ON 1
O11 FAV-COL FAV-COL COL-TEMP 1
O12 COMPONENT Without COMPONENT With COMPONENT 1
O13 AV Without AV With AV 1
O14 AV2 AV1 system AV2 system 1
O15 MTS Without MTS With MTS 1
O16 TONE-CTRL Without S-ADJ With S-ADJ 1
O17 AUTO-OFF Without AUTO-OFF With AUTO-OFF 1
O18 INIT-LANG ENGLISH SPANISH 0
O19 SETUP-FLAG NO SETUP AUTO SETUP 1

3: Display "FRONT A/V INPUTS" and
"REAR A/V INPUTS" in DEMO mode.

O20 FR.AV (Front, 2

Rear AV)

2: Display "FRONT A/V INPUTS" only in
DEMO mode.
1: Display "REAR A/V INPUTS" only in
DEMO mode.
0: No display of above lines in DEMO mode.

Check Mode

Micron mask version, software version and ROM correction function status are displayed in check mode.

12

20U-FS1
CU20FS1

ADJUSTMENT METHOD

Caution: to get into the service mode, one of the ways is press direct key for service items. the other ways

is short the main chassis JA309 and JA402

There is three stage of Service Mode data

First stage data from V01 ~ M06
to go into second stage of service mode data, press MENU key
Second stage data from F01 ~ F51
to go into third stage of service mode data, press MENU key

Third stage data from 001 ~ 020
Below is the contents of these data
First Stage

Data Service Mode Function Range Default Data

V01 SUB-PICTURE CONTRAST 0~127 127
V02 SUB-TINT TINT 0~127 64
V03 SUB-COLOR COLOR 0~127 64
V04 SUB-BRIGHT BRIGHT 0~255 128
V05 SUB-SHARP VIDEO-TONE 0~63 32
V06 V-SHIFT V-SHIFT 0~7 7
V07 H-SHIFT H-PHASE 0~31 16
V08 RF-AGC RF-DELAY 0~127 127
V09 V-SIZE V-SIZE 0~63 32
V10 PIF-VCO VIF-VCO 0~63 32
V11 R-CUTOFF R-CUTOFF 0~255 64
V12 G-CUTOFF G-CUTOFF 0~255 64
V13 B-CUTOFF B-CUTOFF 0~255 64
V14 R-DRIVE R-DRIVE 0~127 64
V15 B-DRIVE B-DRIVE 0~127 64
V16 SUB-COLOR(YUV) COLOR 0~127 64
V17 SUB-TINT(YUV) BASEBAND-TINT 0~127 64
V18 CC-POS 0~255
V19 CUT OFF
V20 SUB-VOL A-ATT 0~127 127
V21 H-VCO H-VCO 0~7
M01 MTS-ATT ATT (MTS) 0~15 10
M02 MTS-VCO VCO (MTS) 0~63 32
M03 MTS-FILTER FILTER (MTS) 0~63 28
M04 MTS-WIDEBAND WIDEBAND (MTS) 0~63 27
M05 MTS-SPECTRAL SPECTRAL (MTS) 0~63 32
M06 SUB-VOL VOL (MTS) 0~63 63

Auto Adjustment Item

1. H-VCO (Currently need manual adj)

2. RF-AGC

3. PIF-VCO

4. MTS-FILTER

13

20U-FS1
CU20FS1

Second Stage

Data Service Mode Function Range Default Data

F01 VIDEO TONE -GAIN (TV) V-TONE 0/1 0
F02 VIDEO TONE -GAIN (AV V-TONE 0/1 0
F03 VIDEO TONE -GAIN(YUV) V -T ONE 0/1 0
F04 ABCL ABCL 0/1 0
F05 BS BS-OFF 0/1 0
F06 ABCL-G ABCL-G 0/1 0
F07 SHP-AV VIDEO-TONE
F08 SHP-YUV VIDEO-TONE
F09 SHP-CLIP EXTRGB-CLIP 0/1 0
F10 E-SAVE CONTRAST(OFFSET) 0~63 30
F11 FAO-VOL A-ATT 0~127 120
F12 PIF-G VIF-GAIN 0~7 0
F13 Y-DELAY(TV) Y-DELAY 0~7 0
F14 Y-DELAY(AV) Y-DELAY 0~7 0
F15 Y-DELAY(YUV) Y-DELAY 0~7 0
F16 TINT-AV TINT(OFFSET) -32~+32 0
F17 COL-AV COLOR(OFFSET) -32~+32 0
F18 R-DRI(R2) R-DRI(OFFSET) -32~+32 0
F19 R-DRI( R) R-DRI(OFFSET) -32~+32 0
F20 R-DRI(B) R-DRI(OFFSET) -32~+32 0
F21 B-DRI(R2) B-DRI(OFFSET) -32~+32 0
F22 B-DRI( R) B-DRI(OFFSET) -32~+32 0
F23 B-DRI(B) B-DRI(OFFSET) -32~+32 0
F24 V-FREE V-FREE 0/1 0
F25 GAMMA GAMMA 0~3 0
F26 TRAP(TV) TRAP-FINE 0~3 2
F27 TRAP(AV) TRAP-FINE 0~3 2
F28 H-FREE H-FREE 0/1 0
F29 1W(TV) V.WINDOW 0/1 0
F30 1W(AV) V.WINDOW 0/1 0
F31 YLPF YSW-LPF 0/1 1
F32 BS-D BS-DISCHARGE 0~3 0
F33 BS-C BS-CHARGE 0~3 0
F34 SL(TV) S-SLICE DOWN 0~3 0
F35 SL(AV) S-SLICE DOWN 0~3 0
F36 SL(YUV) S-SLICE DOWN 0~3 0
F37 AFC2 AFC2-G 0/1 0
F38 VD(TV) VSYNC-DET 0/1 0
F39 VD(AV) VSYNC-DET 0/1 0
F40 AS(TV) AUTO-SLICE 0/1 0
F41 AS(AV) AUTO-SLICE 0/1 0
F42 AS(YUV) AUTO-SLICE 0/1 0
F43 FBP(TV) FBP VTH 0/1 0
F44 FBP(AV) FBP VTH 0/1 0
F45 FBP(YUV) FBP VTH 0/1 0
F46 C.CLIP LEVEL C.CLIP LEVEL 0/1 0
F47 PSW PSW 0/1 0
F48 FAO-VOL VOL 0~63 60
F49 CP CHARGE PUMP 0/1 0
F50 CC LEVEL
F51 OSD POS
F52 COL OFFSET (SUR → NOR) 0
F53 TINT OFFSET (SUR → NOR) 0
F54 TING-YUV TINT-YUV(OFFSET) 0

(OFFSET)
(OFFSET)

-16~+16 0

-16~+16 0

14

Third Stage

Data Service Mode DATA="0" DATA="1" Default Data

001 DEMO DEMO OFF ON 1
002 DOWNLOAD V-CHIP OP OFF ON 1
003 V-CHIP V-CHIP OFF ON 1
004 SPEAKER SPEAKER OFF ON 1
005 FAO FAO OFF ON 1
006 P.PREF P.REF OFF ON 1
007 UNIV+ UNIV+ OFF ON 1
008 VIEW TIMER VIEW TIMER OFF ON 1
009 EZ-SETUP EZ-SETUP AUTO PRESET 1
010 PON-CH POWER-ON OFF 0N 1
011 FAV-COL FAV-COL COL-TEMP 1
012 COMPONENT COMPONENT OFF ON 1
013 AV AV OFF ON 1
014 AV2 AV2 OFF ON 1
015 MTS MTS OFF ON 1
016 TONE-CTRL S-ADJ OFF ON 1
017 AUTO-OFF AUTO-OFF OFF ON 1
018 INIT-LANG ENGLISH SPANISH 1
019 SETUP-FLAG NO SET UP AUTO SET UP 1
020 AV-FR

"0"=NO AV "1"=REAR "2"=FRONT "3"=REAR & FRONT

3

20U-FS1
CU20FS1

15

20U-FS1
CU20FS1

–

–

–

OPTION SET UP

REFER AS BELOW STEP RANGE REFER AS BELOW

ADJUSTMENT

ITEM

CONTROL

ADJUSTMENT

POSITION

PRE-ADJUST

CONTENT

REQUIREMENT

14UFM1

OSD CHECKING

INPUT

CONDITION

OUTPUT

DATA SETUP FOR FIRST AND SECOND STAGE SERVICE DATA

V05 F13 F14 F16 F17 F30 F34 F38 F40 F49

SHARP Y-DL(TV) Y-DL(AV) TINT-AV COL-AV 1W(AV) SL(TV) VD(TV) AS(TV) CP

FUNCTION

14UFM1 50 5 2 8 4 1 1 1 1 1

16-2

F18 F19 F20 F21 F22 F23 F52 F53 F35 F41 F48

R-D(R2) R-D(R) R-D(B) B-D(R2) B-D(R) B-D(B) C-OF TI-OF SL(AV) AS(AV) FAO-VOL

DEF

CU14FM1 50 5 2 8 4 1 1 1 1 1

20U-FS1 50 5 2 8 4 1 1 1 1 1

CU20FS1 50 5 2 8 4 1 1 1 1 1

ADJUSTMENT

PROCEDURE

DATA SETUP FOR FIRST AND SECOND STAGE SERVICE DATA

FUNCTION

14UFM1 +8 +3 -2 -18 -8 +6 0 +8 1 1 60

CU14FM1 +8 +3 -2 -18 -8 +6 0 +8 1 1 60

20U-FS1 +8 +3 -2 -18 -8 +6 0 +8 1 1 58

CU20FS1 +8 +3 -2 -18 -8 +6 0 +8 1 1 58

DEF

–

OPTION SET UP

REFER AS BELOW STEP RANGE REFER AS BELOW

ADJUSTMENT

ITEM

CONTROL

ADJUSTMENT

POSITION

–

–

PRE-ADJUST

CONTENT

REQUIREMENT

14UFM1

OSD CHECKING

INPUT

CONDITION

OUTPUT

BUS OPTION FOR THIRD STAGE SERVICE DATA

001 002 003 004 005 006 007 008 009 010

DEMO DOWNLOAD V-CHIP SP FAO P.PREF UNIV+ VIEW EZ PON-CH

FUNCTION

14UFM1 1 1 1 0 0 0 0 1 0 0

16-1

011 012 013 014 015 016 017 018 019 020

BUS OPTION FOR THIRD STAGE SERVICE DATA

FAV-COL COMP AV AV2 MTS TONE AUTO LAN SETUP AV-FR

FUNCTION

14UFM1 1 0 1 0 0 0 0 0 1 3

CU14FM1 1 0 1 0 0 0 0 0 1 3

20U-FS1 1 1 1 1 1 1 0 0 1 3

CU20FS1 1 1 1 1 1 1 0 0 1 3

009 → “0”=EZ-SETUP “1”=AUTO PRESET

DEF “0”=DISABLE “1”=ENABLE

CU14FM1 1 0 0 0 0 0 0 1 0 0

20U-FS1 1 1 1 1 1 1 1 1 0 0

CU20FS1 1 0 0 1 1 1 1 1 0 0

ADJUSTMENT

PROCEDURE

018 → “0”=ENGLISH “1”=SPANISH

019 → “0”=NO SET UP “1”=AUTO SETUP

DEF 011 → ”0”=FAV-COL “1”=COL-TEMP

16

H-POSITION

AB

V07 STEP RANGE 0-31

20U-FS1
CU20FS1

17-2

C BUS CONTROL

2

I

ADJUSTMENT

ITEM

+B ADJUSTMENT

CONTROL

ADJUSTMENT

POSITION

–

OPTION SET UP, BUS SET UP, CRT-PURITY

US 4 CH LION HEAD (MONOSCOPE)

AC 120V, US MAGNETIC FIELD

PRE-ADJUST

CONTENT

REQUIREMENT

INPUT

CONDITION

1. ADJUST THE V07 BUS DAT A T O HA VE A BALANCE POSITION TO SPEC

CONFIRMATION BY CRT SCREEN

OUTPUT

OF A=B.

B SLIDELY SMALLER THAN A

2. IF CANNOT MAKE IT T O A=B, ADJ FROM THE BEST POINT SO THAT

ADJUSTMENT

PROCEDURE

[CHECKING SPEC]

LEFT AND RIGHT SYMMETRICAL

17-1

– STEP RANGE –

AFTER ALL ADJUSTMENT FINISHED.

US 4 CH LION HEAD (MONOSCOPE PATTERN)

AC 120V, RF INPUT

CONNECT THE DIGITAL VOLTMETER AND MEASURE

+B LINE

ADJUSTMENT

ITEM

CONTROL

ADJUSTMENT

POSITION

PRE-ADJUST

CONTENT

REQUIREMENT

INPUT

CONDITION

OUTPUT

ADJUST R737 SO THAT THE +B VOLTAGE IN VOLTMETER READING IS

AS BELOW.

17

ADJUSTMENT

PROCEDURE

[VOLTAGE COMFIRMATION]

130 ± 0.5VDC (CHECKING SPEC : 130V ± 0.8 VDC)