Sharp 20SL43 User manual

1
20SL43
COLORTELEVISION
Chassis No. MSA
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.
S49F614LK20A/
»ELECTRICAL SPECIFICATIONS .........................................................................................................1
»IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2
»LOCATION OF USER'S CONTROL .....................................................................................................4
»INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................5
»CHASSIS LAYOUT .............................................................................................................................13
»BLOCK DIAGRAM ..............................................................................................................................14
»SCHEMATIC DIAGRAMS ...................................................................................................................18
»PRINTED WIRING BOARD ASSEMBLIES ........................................................................................21
»REPLACEMENT PARTS LIST ............................................................................................................24
»PACKING OF THE SET ......................................................................................................................29
Page
CONTENTS
SERVICE MANUAL
MODELS
POWER INPUT........................................ 110-220 V AC 50/60 Hz
POWER RATING
....................................................................72 W
PICTURE SIZE .......................................... 1,194 cm2(185sq inch)
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ...............................................................QPF 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
....................... 1.5 + 1.5 W (at 10% distortion)
ELECTRICAL SPECIFICATIONS
SPEAKER
SIZE ................................................................ 9 ×5 cm (Round)
VOICE COIL IMPEDANCE
........................... 32 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
Specifications are subject to change without
prior notice.
SHARP CORPORATION
20SL43
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2
20SL43
IMPORTANT SERVICE SAFETY PRECAUTION
ËService workshould be performedonlybyqualifiedservice technicians whoare thoroughly
familiar with all safety checks and the servicing guidelines which follow:
X-RADIATION AND HIGHVOLTAGE LIMITS
1. Be sure all service personnel are aware of the
proceduresand instructionscoveringX-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 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. Highvoltageshould always bekeptatthe ratedvalue
−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. Whenthe highvoltageregulator isoperatingproperly
thereis nopossibilityof anX-radiationproblem.Every
timea colorchassisis serviced, thebrightness 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. Whentroubleshooting andtakingtest measurements
ona receiverwith excessivehighvoltage,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
which are separated by insulating material.The non-
isolated (hot) ground system is for the B+ voltage
regulatorcircuit and thehorizontaloutput circuit.The
isolatedgroundsystemisforthe lowB+ DCvoltages
and the secondary circuit of the high voltage
transformer.
To prevent electrical shock use an isolation
transformer between the line cord and power
receptacle, when servicing this chassis.
SERVICING OF HIGH VOLTAGE SYSTEM
AND PICTURETUBE
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. Picturetube inthisreceiveremploysintegralimplosion
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.
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3
20SL43
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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 increasedbyusingreplacementcomponents
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 and 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 110~220 volt AC
outlet, (Do not use an isolation transformer for this
test).
•Using two clip leads, connect a 1.5k ohm, 10 watt
resistorparalleled bya 0.15µFcapacitor inserieswith
all exposed metal cabinet parts and a known earth
ground,suchas electrical conduitor electricalground
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. 1.5k ohm
10W
0.15µF
TEST PROBE
TO EXPOSED
METAL PARTS CONNECT TO
KNOWN EARTH
GROUND
For continued protection, replacement parts must be
identical to those used in the original circuit.The use of
substitutereplacement partswhich donothavethe same
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
BEFORE RETURNINGTHE 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 and 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.)
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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4
20SL43
LOCATION OF USER'S CONTROL
TV
Infrared Transmitter Window
INPUT
Press→Switch to external video input
mode.
Press again →Switch to TV mode.
Press →Switch to external video
INPUT 1 mode.
Press 2 times →Switch to external
video INPUT 2 mode.
CHANNEL UP/DOWN
(') Selects next higher channel.
(" ) Selects next lower channel.
• Moves the “ ” mark of the MENU
screen.
MENU
Press →Accesses MAIN MENU.
Press again →Exits MAIN MENU.
DISPLAY
Press→Displaysreceivingchannelfor
4 seconds.
Press again→Removes display.
• Temporarily displays receiving
channel when in Closed Caption
mode.
Front Panel
CHANNEL UP/DOWN
(') Selects next higher channel.
(") Selects next lower channel.
VOLUMEUP/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.
VOLUMEUP/DOWN
(+) Increases sound.
(–) Decreases sound.
• In menu mode, changes or selects
the TV adjustments.
MUTE
Press →Mutes sound.
Press again →Restores sound.
• CLOSED CAPTION appears when
sound is muted.
MENU
Press ;Accesses MAIN MENU.
Press again ;Exits MAIN MENU.
VIDEO/AUDIO IN TERMINALS
(VIDEO/AUDIO terminals are also
provided on the rear.)
ON TIMER indicator.
SENSORAREAFOR
REMOTE CONTROL
POWER
Press →On.
Press again →Off.
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5
20SL43
CIRCUIT PROTECTION
The receiver is protected by a 3.15A fuse (F701),
mounted on PWB-A, wired into one side of the AC
line input.
+B DC REGULATOR CONFIRMATION
The+ B DCoutput voltageadjustment is notincluded
in this circuit.However, should confirmation be
reguired proceed as follows.
1. Actuate receiver with 220V AC input voltage.
2. Receive a local channel.
3. Connect positive lead of digital voltmeter to C754
positive side on PWB-A ; negative lead to chassis
ground.
4. Confirm this voltage reading is as below.
CAUTION: The reading should be within +130.0 ± 2.0V
DC to ensure normal function and circuitry
reliability.
X-RADIATION PROTECTOR CIRCUITTEST
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. Apply220V ACusingavariac transformerforaccurate
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 toTP653 and make sure
that the voltmeter reads 21.4 ± 1.5V.
5. Apply external 27.9V DC at TP653 by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and make
ashortcircuitbetweenTP651 andTP652.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 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. Operatereceiverforatleast 15minutes at110~220V
AC line voltage, with a strong air signal or a properly
tuned in test signal.
3. Receve a good local channel.
4. The voltage should be approximately, 25.5kV (at
pictuer MAX Bright center condition).
Ifacorrect readingcannotbe obtained,checkcircuitry
for malfunctioning components.
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.
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6
20SL43
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 item 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 item will vary in increments
of one.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.
Short JA137&JA138 for 1 Second and release to switch
to the service mode position, and the microprocessor is
in input mode.(Adjustment through the I2C bus control.)
To exit the service mode, turn the television off by
pressing the power button.
25AGC:
DATA NUMBER
SERVICE ADJUSTMENT ITEM
Figure A.
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7
20SL43
SERVICE MODE
(1) In the Service Mode, Key is used to select the mode in the following oreder.
AGC & WHITE POINT SUB
GEOMETRIC ADJ. ADJ.
MODE MODE MODE
OFFSET
ADJ.
MODE
FEATURE IC MTS
OPTION OPTION ADJ.
MODE MODE MODE
AGC &
GEOMETRIC
MODE
↓
AGCTAKE OVER POINT (AGC)
↓
VERTICAL SLOPE (V-LIN)
↓
VERTICAL AMP (V-AMP)
↓
VERTICAL SHIFT (V-CENT)
↓
VERTICAL ZOOM (V-ZOOM)
↓
HORIZONTAL SHIFT (H-CENT)
↓
EAST-WEST WIDTH (H-SIZE)
↓
HORIZONTAL PARALLELOGRAM (EW//)
↓
EAST-WEST PARABOLA / WIDTH (PARA)
↓
EAST-WEST UPPER CORNER
PARABOLA (COR(U))
↓
EAST-WEST LOWER CORNER
PARABOLA (COR(L))
↓
EAST-WEST TRAPEZIUM (TRAPE)
↓
HORIZONTAL BOW (HB)
↓
S-CORRECTION (S-COR)
WHITE POINT
ADJ.
MODE
↓
W.P.RED OFFSET HIGH /
OFFSET BLUE TONE (DRI-R-HI)
↓
W.P.GREEN OFFSET HIGH /
OFFSET BLUE TONE (DRI-G-HI)
↓
W.P.BLUE OFFSET HIGH /
OFFSET BLUE TONE (DRI-B-HI)
↓
W.P.RED MH / STD (DRI-R-MH)
↓
W.P.GREEN MH / STD (DRI-G-MH)
↓
W.P.BLUE MH / STD (DRI-B-MH)
↓
W.P.RED OFFSET ML /
OFFSET RED TONE (DRI-R-ML)
↓
W.P.GREEN OFFSET ML /
OFFSET RED TONE (DRI-G-ML)
↓
W.P.BLUE OFFSET ML /
OFFSET RED TONE (DRI-B-ML)
↓
W.P.RED OFFSET LOW (DRI-R-LO)
↓
W.P.GREEN OFFSET LOW (DRI-G-LO)
↓
W.P.BLUE OFFSET LOW (DRI-B-LO)
SUB
ADJ.
MODE
↓
MAX VOLUME (SUB-VOL)
↓
SUB CONTRAST (SUB-CON)
↓
SUB TINT (SUB-TINT)
↓
SUB COLOUR (SUB-COL)
↓
SUB BRIGHTNESS (SUB-BRI)
↓
SUB SHARPNESS (SUB-SHP)
↓
MAX HOTEL VOLUME (HTL-VOL)
↓
HOTEL PROGRAM NO(HTL-PRG)
↓
BLUE BACK CONTRAST (BB-CON)
↓
OSD GRB REFERENCE (RGB)
↓
BLACK LEVEL OFFSET R(CUT-R)
↓
BLACK LEVEL OFFSET G(CUT-G)
↓
CATHODE DRIVE LEVEL(CDL)
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8
20SL43
1Press the CH DOWN/UP key on the remote controller to get ready to select the mode one by one.
2Press the CH DOWN/UP key on the remote controller to select the modes reversibly one by one.
3Using the VOLUME UP/DOWN key on the remote controller, the data can be modified.
(OSD disturbance can be erased by R/C display key)
Figure B: ADJUSTMENT CATEGORIES
OFFSET
ADJ.
MODE
↓
Y-D TIME (TV) [YD ] (DL-TV)
↓
Y-D TIME (AV) [ YD ] (DL-AV)
↓
INITIAL/DEFAULT LANGUAGE (INIT)
↓
FAO-MAX VOLUME (FAO-VOL)
↓
ENERGY SAVE OFFSET (ESV_OFFS)
↓
CLOSE CAPTION POSITION (CCPOS)
MTS
ADJ.
MODE
↓
ATTENUATE INPUT SIGNAL LEVEL (ATT)
↓
VCO FREE RUNNING FREQUENCY ADJ. (VCO)
↓
STEREO, SAP, DBX FILTER ADJ.(FILTER)
↓
STEREO SEPARATION ADJUSTMENT (300HZ) (WIDEBAND)
↓
STEREO SEPARATION ADJUSTMENT (3kHZ) (SPECTRAL)
↓
BASS LEVEL (BASS)
↓
TREBLE LEVEL (TREBLE)
IC
OPTION
MODE
↓
VERTICAL SCAN DISABLE (VSD)
↓
BLACK STRETCH (BKS)
↓
AUTOMATIC VOLUME LEVELLING (AVL)
↓
FAST FILTER IF-PLL ( FFI )
↓
ENABLE VERTICAL GUARD ( EVG )
↓
EHT TRACKING MODE ( EHT )
↓
OVERSCAN SWITCH OFF (OSO)
↓
AUTO COLOUR LIMIT (ACL)
↓
FORCED COLOUR-ON (FCO)
↓
VIDEO MUTE AT IDENT LOSS (VMI)
↓
VIDEO MUTE AT PROGRAM/SOURCE CHANGE (VMC)
↓
HOTEL MODE (HTL)
↓
GAIN FM DEMODULATOR (BTSC)
↓
CHARGE PUMP (CP)
↓
FM WINDOW SELECTION (FMWS)
↓
SOUND MUTE BIT 0 (SM0)
↓
SOUND MUTE BIT 1 (SM1)
↓
IF AGC SPEED BIT 0 (AGC0)
↓
IF AGC SPEED BIT 1 (AGC1)
↓
PHI 1 TIME CONSTANT FOR FE (FOA-FE)
↓
PHI 1 TIME CONSTANT FOR FE (FOB-FE)
↓
PHI 1 TIME CONSTANT FOR AV (FOA-AV)
↓
PHI 1 TIME CONSTANT FOR AV (FOB-AV)
↓
FORCED SLICING LEVEL FOR VERTICAL SYNC.(FSL)
↓
SYNCHRONISATION OF OSD/TEXT DISPLAY (HP2)
↓
RGB BLANK (RGBL)
FEATURE
OPTION
MODE
↓
V-CHIP (V-CHIP)
↓
MTS DECODING ENABLED (MTS)
↓
DEMO MODE (DEMO)
↓
REAL TIME CLOCK / ON TIMER (CLOCK)
↓
ENERGY SAVE (E-SAVE)
↓
PERSONAL PREFERENCE PROGRAM (P_PREF)
↓
UNIVERSAL PLUS (UNIV+)
↓
SPEAKER ON/OFF (SPEAKER)
↓
FIXED AUDIO OUT (FAO)
↓
VIEW TIMER (VIEW-TM)
↓
FRENCH LANGUAGE (FRENCH)
↓
EZ SETUP / AUTOPRESET (EZ-SETUP)
↓
WHITE TEMP OR FAVORITE COLOR (W-TEMP)
↓
AV ENABLED OR DISABLED (AV)
↓
AV2 ENABLED OR DISABLED (AV2)
↓
DYNAMIC SKIN CONTROL (DSK)
↓
RATIO PRE- AND OVERSHOOT BIT 0 (RPO0)
↓
RATIO PRE- AND OVERSHOOT BIT 1 (RPO1)
↓
GAIN FM DEMODULATOR (AGN)
↓
AUTO SWITCH OFF ENABLED (AUTO-OFF)
FORWARD : CH DOWN KEY
REVERSE : CH UP KEY
( ) means OSD display.
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9
20SL43
SERVICE
POSITION ADJUST ITEM DATA
RANGE
INITIALVALUE FIX/ADJ REMARK
AGC AGC TAKE OVER POINT 0~63 14 ADJ
V-LIN VERTICAL SLOPE 0~63 32 ADJ
V-AMP VERTICAL AMP 0~63 32 ADJ
V-CENT VERTICAL SHIFT 0~63 32 ADJ
V-ZOOM VERTICAL ZOOM 0~63 32 FIX
H-CENT HORIZONTAL SHIFT 0~63 32 ADJ
H-SIZE EAST-WEST WIDTH 0~63 32 FIX
EW// HORIZONTAL PARALLELOGRAM 0~63 32 FIX
PARA EAST-WEST PARABOLA / WIDTH 0~63 32 FIX
COR(U) EAST-WEST UPPER CORNER PARABOLA 0~63 32 FIX
COR(L) EAST-WEST LOWER CORNER PARABOLA 0~63 32 FIX
TRAPE EAST-WEST TRAPEZIUM 0~63 32 FIX
HB HORIZONTAL BOW 0~63 32 FIX
S-COR S-CORRECTION 0~63 0 FIX must be "17"
DRI-R-HI “W,P RED OFFSET HIGH / OFFSET BLUE TONE” 0~63 32 FIX must be "32"
DRI-G-HI W.P. GREEN OFFSET HIGH / OFFSET BLUE TONE 0~63 32 FIX must be "33"
DRI-B-HI W.P.BLUE OFFSET HIGH / OFFSET BLUE TONE 0~63 32 FIX must be "37"
DRI-R-MH W.P. RED MH / STD 0~63 25 FIX must be "32"
DRI-G-MH W.P. GREEN MH / STD 0~63 32 ADJ
DRI-B-MH W.P. BLUE MH / STD 0~63 32 ADJ
DRI-R-ML W.P. RED OFFSET ML / OFFSET RED TONE 0~63 32 FIX must be "32"
DRI-G-ML W.P. GREEN OFFSET ML / OFFSET RED TONE 0~63 32 FIX must be "32"
DRI-B-ML W.P. BLUE OFFSET ML / OFFSET RED TONE 0~63 32 FIX must be "25"
DRI-R-LO W.P. RED OFFSET LOW 0~63 32 FIX must be "32"
DRI-G-LO W.P. GREEN OFFSET LOW 0~63 32 FIX must be "22"
DRI-B-LO W.P. BLUE OFFSET LOW 0~63 32 FIX must be "19"
SUB-VOL MAX VOLUME 0~63 63 FIX must be "63"
SUB-CON SUB CONTRAST 0~63 63 FIX must be "54"
SUB-COL SUB COLOUR 0~63 32 ADJ
SUB-BRI SUB BRIGHTNESS 0~63 32 ADJ
SUB-TINT SUB TINT 0~63 32 ADJ
SUB-SHP SUB SHARPNESS 0~63 32 FIX must be "27"
HTL-VOL MAX HOTEL VOLUME 0~63 32 FIX
HTL-PRG HOTEL PROGRAM NO 0~125 or >125 for none 255 FIX
BB-CON BLUE BACK CONTRAST 0~15 10 FIX must be "5"
RGB OSD GRB REFERENCE 0~15 15 FIX must be "5"
CUT-R BLACK LEVEL OFFSET R 0~63 32 ADJ
CUT-G BLACK LEVEL OFFSET G 0~63 32 ADJ
CDL CATHODE DRIVE LEVEL 0~15 0 FIX must be "6"
DL-TV Y-D TIME (TV) [YD ] 0~15 12 FIX must be "2"
DL-AV Y-D TIME (AV) [YD ] 0~15 12 FIX must be "8"
INIT INITIAL/DEFAULT LANGUAGE 0(English), 1(Spanish), 0 FIX must be "1"
2(French)
FAO-VOL FAO-MAXVOLUME 0~63 63 FIX must be "63"
ESV_OFFS ENERGY SAVE OFFSET 0~63 10 FIX must be "20"
CCPOS CLOSE CAPTION POSITION 0~255 32 ADJ
ATT ATTENUATE INPUT SIGNAL LEVEL 0~15 10 FIX*
VCO VCO FREE RUNNING FREQUENCY ADJ. 0~63 32 FIX*
FILTER “STEREO, SAP, DBX FILTER ADJ.“0~63 28 FIX*
WIDEBAND STEREO SEPARATION ADJUSTMENT (300HZ) 0~63 32 FIX*
SPECTRAL STEREO SEPARATION ADJUSTMENT (3kHZ) 0~63 27 FIX*
BASS BASS LEVEL 0Å‘15 8 FIX
TREBLE TREBLE LEVEL 0Å‘15 8 FIX
VSD VERTICAL SCAN DISABLE 0 or 1 when item selected 0 FIX
BKS BLACK STRETCH 0(disable) or1(enable) 1 FIX
AVL AUTOMATIC VOLUME LEVELLING 0(disable) or1(enable) 1 FIX
FFI FAST FILTER IF-PLL 0(disable) or1(enable) 0 FIX
EVG ENABLE VERTICAL GUARD 0(disable) or1(enable) 1 FIX
EHT EHT TRACKING MODE 0(disable) or1(enable) 1 FIX
OSO OVERSCAN SWITCH OFF 0(disable) or1(enable) 0 FIX
ACL AUTO COLOUR LIMIT 0(disable) or1(enable) 0 FIX
FCO FORCED COLOUR-ON 0(disable) or1(enable) 0 FIX
VMI VIDEO MUTE AT IDENT LOSS 0(disable) or1(enable) 1 FIX
VMC VIDEO MUTE AT PROGRAM/SOURCE CHANGE 0(disable) or1(enable) 1 FIX
HTL HOTEL MODE 0(disable) or1(enable) 0 FIX
BTSC GAIN FM DEMODULATOR 0(disable) or1(enable) 0 FIX
CP CHARGE PUMP 0(fast tuning) or 1 0 FIX
(moderate speed tuning)
SERVICE MODE





Table - A
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10
20SL43
SERVICE
POSITION ADJUST ITEM DATA
RANGE
INITIALVALUE FIX/ADJ REMARK
FMWS FM WINDOW SELECTION 0(disable) or1(enable) 0 FIX
SM0 SOUND MUTE BIT 0 (SM0) 0(disable) or1(enable) 1 FIX
SM1 SOUND MUTE BIT 1 0(disable) or1(enable) 0 FIX
AGC0 IF AGC SPEED BIT 0 0(disable) or1(enable) 1 FIX
AGC1 IF AGC SPEED BIT 1 0(disable) or1(enable) 0 FIX
FOA-FE PHI 1TIME CONSTANT FOR FE 0(disable) or1(enable) 0 FIX
FOB-FE PHI 1 TIME CONSTANT FOR FE 0(disable) or1(enable) 0 FIX
FOA-AV PHI 1 TIME CONSTANT FOR AV 0(disable) or1(enable) 1 FIX
FOB-AV PHI 1 TIME CONSTANT FOR AV 0(disable) or1(enable) 1 FIX
FSL FORCED SLICING LEVEL FORVERTICAL SYNC. 0(disable) or1(enable) 0 FIX
HP2 SYNCHRONISATION OF OSD/TEXT DISPLAY 0(disable) or1(enable) 0 FIX
RGBL RGB BLANK 0(disable) or1(enable) 0 FIX
V-CHIP V-CHIP 0(disable) or1(enable) 0 FIX
MTS MTS DECODING ENABLED 0(disable) or1(enable) 0FIX*
DEMO DEMO MODE 0(disable) or1(enable) 1 FIX
CLOCK REAL TIME CLOCK / ON TIMER 0(disable) or1(enable) 1 FIX must be "1"
E-SAVE ENERGY SAVE 0(disable) or1(enable) 1 FIX
P_PREF PERSONAL PREFERENCE PROGRAM 0(disable) or1(enable) 0 FIX
UNIV+ UNIVERSAL PLUS 0(disable) or1(enable) 0 FIX
SPEAKER SPEAKER ON/OFF 0(disable) or1(enable) 0 FIX
FAO FIXED AUDIO OUT 0(disable) or1(enable) 0 FIX
VIEW-TM VIEW TIMER 0(disable) or1(enable) 1 FIX must be "1"
FRENCH FRENCH LANGUAGE 0(disable) or1(enable) 0 FIX
EZ-SETUP EZ SETUP / AUTOPRESET 0(AUTOPRESET) or 1 FIX
1(EZ SETUP)
W-TEMP WHITE TEMP OR FAVORITE COLOR 0(FC) or 1(WT) 0 FIX
AV AV ENABLED OR DISABLED 0(without ext. source) or 0 FIX
1(with external source)
AV2 AV2 ENABLED OR DISABLED 0(1 input) or 1(2 input) 0FIX*
DSK DYNAMIC SKIN CONTROL 0(disable) or1(enable) 0 FIX
RPO0 RATIO PRE- AND OVERSHOOT BIT 0 0(disable) or1(enable) 0 FIX
RPO1 RATIO PRE- AND OVERSHOOT BIT 1 0(disable) or1(enable) 0 FIX
AGN GAIN FM DEMODULATOR 0(normal) or1(+6dB) 0 FIX
AUTO-OFF AUTO SWITCH OFF ENABLED 0(disable) or1(enable) 1 FIX
PON-CH 0(disable) or1(enable) 0 FIX
IC801
IC1003 X
CRT X
Data is stored in IC1003.
Adjust items related to picture tube only.
Holding down to short JA137 & JA138 and turn on the main power SW will automatically write the initial values into
IC1003.
This is only can done when a new EEPROM is used. (Judge with the first 4 bytes.)
Table - B
Holding down to short JA137 & JA138 and turn on the main
powerSWwillautomaticallywrite theinitialvaluesinto IC1003.
This is only can done when a new EEPROM is used. (Judge
with the first 4 bytes.)
X
ADJUSTMENT
NECESSARY UNNECESSARY
PART REPLACED NOTES
Table - A
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20SL43
ËSERVICE ADJUSTMENT
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the service mode signal category and select
the service adjustment "AGC".
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.
HORIZONTAL ANDVERTICAL DEFLECTION LOOP ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
V-SLOPE(I2C
BUS CON-
TROL)
V-CENTER (I2C
BUS CON-
TROL)
V - AMP (I2C
BUS CON-
TROL)
S-CORREC-
TION (I2C BUS
CONTROL)
H - CENTER
1. Receive Monoscope Pattern Signal.
2. Call the "V-LIN" mode.
3. Increase or decrease "V-LIN" by Volume key till
the horizontal line in the center of monoscope is
just at the position where the blanking starts.
1. Call the "V-CENT" mode.
2.Increase ordecrease"V-CENT" byVolume keytill
the picture is centered.
1. Call the "V-AMP" mode.
2. Increaseordecrease "V-AMP" byVolume keyto
set overscan of 10.0% typical.
Adjustment Spec 10.0% range ±1%.
FIXED DATA, NO NEEDTO ADJUST.
1. Call the "H-CENT" mode.
2. Increase or decrease "H-CENT" by Volume key
to center the picture horizontal.
1
2
3
4
5
Focus
adjustment 1. Receive the "Monoscope Pattern" signal. 2. Press R/C to set Picture NORMAL condition.
3. Adjust the focus control to get the best focus.
6
No. Adjusting point Adjusting procedure/conditions Waveform and others
SUB-TINT (I2C
BUS CON-
TROL)
1. Receive the "Colour Bar" signal through AV in.
2. Connect the oscilloscope to TP853 (Pin (5) of
P882) BLUE-OUT.
»Range :100mV/div.(AC)(UseProbe10:1)
»Sweep time : 10 µsec/div.
3. Call the "SUB-TINT" mode in service mode. Ad-
just the "SUB-TINT" bus data to obtain the wave-
form shown as Fig 1.
4. "SUB-TINT" bus data decrease 4 steps to get fi-
nal waveform. (Fig 2.)
5. Clear the SERVICE mode.
1
CHROMA ADJUSTMENT
FINAL WAVEFORM
Fig 2
WAVEFORM 1
YCYGMGR BW
SAME LEVEL
Fig 1
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20SL43
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
CRT CUTOFF
ADJUSTMENT
(I2C BUS
CONTROL)
1. SwitchTV toVIDEOmode,BLUEBACKOFF, with
NO VIDEO signal.
2. Press R/C to set Picture Normal condition.
3. Connect the oscilloscope to Red OUT from
IC801.(TP47R)
Range : 1 V/Div (DC)
Sweep : 5 msec/Div
4. AdjustSCREENVR ,sothat thetipofsignalreach
3.5 Vdc + 0.1 Vdc.
1
Maximum
beam check 1. Receive the "Monoscope Pattern" signal. 2. Press R/C to set Picture NORMAL condition.
3. Connect the DC miliammeter betweenTP603 (+)
andTP602 (–).
(Full Scale: 3 mA Range)
4. Beam current must be within 990 ± 50 µA.
4
SUB-BRIGHT-
NESS
ADJUSMENT
(I2C BUS
CONTROL)
1. Call" SUB-BRI"in servicemode.(ReceiveCross-
hatch pattern with 5 black level windows)
2. Adjust the " SUB BRIGHT " bus data in order that
the line 1, 2 and 3 have the same darkness
wherelse line 4 is slightly brighter than line 1, 2
and 3 and finally line 5 will be the brighter than
line 4.
2
1, 2, 3 are in same black level.
WHITE BAL-
ANCE SERV-
ICE MODE
ADJ. (I2C BUS
CONTROL)
3# 11,600°K X : 0.273
Y : 0.280
( MINOLTA COLOUR ANALYZER
CA-100)
*NOTE: Above DATA can be UP/
DOWN by volume key.
LOW HIGH
20" 1.8cd/m2115cd/m2
* 11,600°K
DRI-GW="DRI-GS"DATA-5
DRI-BW="DRI-BS" DATA-5
1.Receive the "Monoscope Pattern" signal.
2. Press R/C to set Picture NORMAL condition.
3.Connect theDC miliammeterbetween theTP 602
( - ) TP 603 ( + ).
4.Check Beam current should be around (990µA)
5.Set it to service mode and adjust the DRI-G-MH,
& DRI-B-MH data to have a colour temperature
of 11,600°K ( white ).
6. Receive "WHITE" pattern, WITH BURST signal,
and set BRIGHTNESS Y by generator, to ** 10
cd/m2(MINOLTACA-100)byreducingLUMINATE
Y signal.
7.Adjust "CUT-R" & "CUT-G" to get 11,600°K.Then
go back NORMAL mode (HIGH BRIGHT**) to
check colour temperature. If out of range, back
to (1).
Note: This adjustment must be done after
warming up the unit for 30 minutes or
longer with a beam current over 500µA.
DRI-R-MH=32 (FIXED)
DRI-G-MH=33 (FIXED)
DRI-B-MH=37 (FIXED)
DRI-R-MH=32 (FIXED)
1 2 3 4 5
1 V
3.5Vdc
0
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20SL43
MODEL 20SL43 CHASSIS LAYOUT
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20SL43
BLOCK DIAGRAM-1
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20SL43
15
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MODEL 20SL43 BLOCK DIAGRAM-2
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17
20SL43
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
voltage set at 120V AC and all controls set 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.
This circuit diagram is a standard one, printed circuits
may be subject to change for product improvement
without prior notice.
WAVEFORMS
1 1.0 Vp-p
Horiz. Rate Horiz. Rate Horiz. Rate Horiz. Rate Horiz. Rate
Horiz. Rate Horiz. Rate Vert. Rate Horiz. Rate Horiz. Rate
Horiz. Rate Vert. Rate Horiz. Rate Horiz. Rate Power Supply Rate
2 2.8 Vp-p 3 2.6 Vp-p 4 2.7 Vp-p 5 65.0 Vp-p
6 67.0 Vp-p
q 8.4 Vp-p w 40.8 Vp-p e 98.0 Vp-p r 1,160 Vp-p t 415.0 Vp-p
7 80.0 Vp-p 8 3.0 Vp-p 9 2.3 Vp-p 0 116.0 Vp-p
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MODEL 20SL43 BLOCK DIAGRAM-2
20SL43
18 19
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SCHEMATIC DIAGRAM: CRT Unit
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20SL43
PWB-A: MAIN Unit (Wiring Side)
PRINTEDWIRING BOARD ASSEMBLIES
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PWB-A: MAIN Unit (Chip Parts Side)
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