Toshiba 20AR22, 20AR32 Service Manual

TOSHIBA

FILE NO.050-200217

SERVICE MANUAL

COLOR TELEVISION

20AR22

20AR32

AUTO VOLT AGE

MTS STE REO AUTO VOLT AGE

DOCUMENT CREATED IN JAPAN, Aug., 2002

20AR22

S49F614LK20A/

20AR32

COLOR TELEVISION

Chassis No. MSA

AUTO VOLT AGE

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.

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

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

» LOCATION OF USER'S CONTROL .....................................................................................................4

» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................5

» CHASSIS LAYOUT .............................................................................................................................13

» BLOCK DIAGRAM ..............................................................................................................................15

» SCHEMATIC DIAGRAMS ...................................................................................................................20

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................28

» REPLACEMENT PARTS LIST ............................................................................................................32

» PACKING OF THE SET ......................................................................................................................39

MTS ST EREO AUTO VOLT AGE

MODELS

CONTENTS

20AR32

Page

20AR22

ELECTRICAL SPECIFICATIONS

POWER INPUT........................................ 110-220 V AC 50/60 Hz

POWER RATING

20AR21 ................................................................................72 W

20AR31 ................................................................................79 W

PICTURE SIZE .......................................... 1,192 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

20AR21 ................................... 1.5 + 1.5 W (at 10% distortion)

20AR31 ................................... 3.0 + 3.0 W (at 10% distortion)

SPEAKER

SIZE ................................................................ 9 × 5 cm (Round)

VOICE COIL IMPEDANCE

20AR21 ....................................................... 32 ohm at 400 Hz

20AR31 ......................................................... 4 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.

20AR22 20AR32

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be performed only b y 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 and the horizontal output circuit. The isolated ground system is for the low B+ DC v oltages and the secondary circuit of the high voltage transformer. To prevent electrical shock use an isolation transformer between the line cord and power receptacle, when servicing this chassis.

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

When servicing the high voltage system, 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 integr al 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. Howe ver , 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 kept 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, av oid being unnecessarily close to the receiver. Do not operate the receiver longer than is necessary to locate the cause of excessive voltage.

2 2

IMPORTANT SERVICE SAFETY PRECAUTION

(Continued)

20AR22 20AR32

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 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 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 ha ving with 5000 ohm per v olt, 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 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 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.

1.5k ohm 10W

0.15µF

TEST PROBE

TO EXPOSED

METAL PARTS

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

CONNECT TO KNOWN EARTH GROUND

SAFETY NOTICE

Many electrical and mechanical parts in television receivers have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be 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.

234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121

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.

20AR22 20AR32

LOCATION OF USER'S CONTROL

Front Panel

POWER

Press → On. Press again → Off.

ON TIMER indicator. SENSOR AREA FOR

REMOTE CONTROL

MTS STEREO AUTO VOLTAGE

VOLUME UP/DOWN

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

(20AR22)

VIDEO/AUDIO TERMINALS

(VIDEO/A provided on the rear

(20AR32)

VIDEO/AUDIO TERMINALS

CHANNEL UP/DOWN

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

UDIO terminals are also

Basic Remote Control Functions

POWER

Press → On. Press again → Off.

REMOTE KEYPAD

Accesses any channel from keypad.

FLASHBACK

Returns to previous channel.

VOLUME UP/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.

Press;Accesses MAIN MENU. Press again ;Exits MAIN MENU.

Infrared Transmitter Window

INPUT

Press→ Switch to external video input mode. Press agai n → Switch to TV mo de. (20AR22)

Press → Switch to external video INPUT 1 mode. Press 2 time s → Switch to exte rnal video INPUT 2 mode. Press 3 times → Switch back to the original TV mode. (20AR32)

CHANNEL UP/DOWN

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

• Moves the “ screen.

Press → Accesses MAIN MENU. Press again → Exits

DISPL

Press→ Displays receiving cha nnel for 4 seconds.

CT-818

Press again→ Removes display.

• Te channel when in Closed Caption mode.

” mark of the MENU

MAIN MENU.

mporarily displays receiving

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.

20AR22 20AR32

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 DC output voltage adjustment is not included 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 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:

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 110~220V 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). If a correct reading cannot be obtained, check circuitry for malfunctioning components.

1. Apply 220V AC using a variac transf ormer for accurate input voltage.

2. Allow for warm up and adjust all customer controls for normal picture and sound.

3. Receive a good local channel.

4. Connect a digital voltmeter to TP653 and make sure that the voltmeter reads 21.4 ± 1.5 V.

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 a short circuit between TP651 and TP652. No w make sure that normal picture appears on the screen.

7. If the operation of the hor izontal oscillator does not stop in step 5, the circuit must be repaired before the set is returned to the customer.

20AR22 20AR32

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 item selection

Once in the service mode, press the Ch-up or Chdown 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 ser vice mode and exit service 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.

SERVICE ADJUSTMENT ITEM

Figure A.

DATA NUMBER

25AGC:

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

FEATURE IC MTS

OPTION OPTION ADJ.

MODE MODE MODE

20AR22 20AR32

OFFSET

ADJ.

MODE

AGC &

GEOMETRIC

MODE

AGC TAKE 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)

↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓

20AR22 20AR32

OFFSET

ADJ.

MODE

Y-D TIME (TV) [ YD ] (DL-TV) Y-D TIME (AV) [ YD ] (DL-AV)

INITIAL/DEFAULT LANGUAGE (INIT)

FA O-MAX V OLUME (FA O-V OL)

ENERGY SAVE OFFSET (ESV_OFFS)

CLOSE CAPTION POSITION (CCPOS)

↓ ↓ ↓ ↓ ↓ ↓

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)

↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓

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)

↓ ↓ ↓ ↓ ↓ ↓ ↓

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.

Figure B: ADJUSTMENT CATEGORIES

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)

SER VICE MODE

20AR22 20AR32

SERVICE

POSITION

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"

FAO-VOL FAO-MAX VOLUME 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* 20AR22=FIX WIDEBAND STEREO SEPARATION ADJUSTMENT (300HZ) 0~63 32 FIX* 20AR32=ADJ 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 AUT OMATIC 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

ADJUST ITEM

RANGE

2(French)

(moderate speed tuning)

DATA

INITIAL VALUE

FIX/ADJ

REMARK

    

Table - A

20AR22 20AR32

SERVICE

POSITION

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 1 TIME 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 FOR VERTICAL 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) 0 FIX* 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

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

AV2 AV2 ENABLED OR DISABLED 0(1 input) or 1(2 input) 0 FIX* 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

ADJUST ITEM

RANGE

1(EZ SETUP)

1(with external source)

DATA

INITIAL VALUE

FIX/ADJ

REMARK

20AR22→0/20AR32→1

Table - A

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.)

PART REPLACED

IC801

IC1003

CRT

NECESSARY

ADJUSTMENT

UNNECESSARY

NOTES

Data is stored in IC1003. 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.)

Adjust items related to picture tube only.

Table - B

WA VEFORM 1

YCYGMGR BW

SAME LEVEL

SERVICE ADJUSTMENT

RF AGC Adjustment

1. Receive a good local channel.

2. Enter the ser vice 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 confir m that no noise or beat appears.

CHROMA ADJUSTMENT

No. Adjusting point Adjusting procedure/conditions Waveform and others

SUB-TINT (I BUS CONTROL)

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)(Use Probe 10:1) » Sweep time : 10 µsec/div.

3. Call the "SUB-TINT" mode in ser vice mode. Adjust the "SUB-TINT" bus data to obtain the wav eform shown as Fig 1.

4. "SUB-TINT" bus data decrease 4 steps to get final waveform. (Fig 2.)

5. Clear the SERVICE mode.

Fig 1

FINAL WA VEFORM

Fig 2

20AR22 20AR32

HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT

No. Adjusting point Adjusting procedure/conditions Waveform and others

V-SLOPE(I2C

BUS CONTROL)

V-CENTER (I2C

BUS CONTROL)

V - AMP (I2C BUS CONTROL)

S-CORRECTION (I2C BUS CONTROL) H - CENTER

Focus

adjustment

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 or decrease "V-CENT" by Volume key till the picture is centered.

1. Call the "V-AMP" mode.

2. Increase or decrease "V - AMP" by V olume ke y to set overscan of 10.0% typical. Adjustment Spec 10.0% range ±1%.

FIXED DATA, NO NEED TO ADJUST.

1. Call the "H-CENT" mode.

2. Increase or decrease "H-CENT" by Volume key to center the picture horizontal.

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.

20AR22

1 2 3 4 5

20AR32

CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT

No. Adjusting point Adjusting procedure/conditions Waveform and others

CRT CUTOFF

ADJUSTMENT (I2C BUS CONTROL)

SUB-BRIGHT-

NESS ADJUSMENT (I2C BUS CONTROL)

WHITE BAL-

3 # 11,600° K X : 0.273

ANCE SERVICE MODE ADJ. (I2C BUS CONTROL)

1. Switch TV to VIDEO mode ,BLUE BACK OFF, 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. Adjust SCREEN VR ,so that the tip of signal reach

3.5 Vdc + 0.1 Vdc.

1. Call " SUB-BRI" in service mode. (Receive Crosshatch 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.

1. Receive the "Monoscope Pattern" signal.

2. Press R/C to set Picture NORMAL condition.

3. Connect the DC miliammeter betw een the TP 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 (MINOL T A CA-100) b y reducing LUMINA TE 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).

3.5Vdc

1 V

1, 2, 3 are in same black level.

Y : 0.280

( MINOLT A COLOUR ANALYZER CA-100) *NOTE: Above DATA can be UP/ DOWN by volume key.

LOW HIGH

20" 1.8cd/m2115cd/m * 11,600° K

DRI-GW="DRI-GS"DATA-5 DRI-BW="DRI-BS" DATA-5

Maximum beam check

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. Receive the "Monoscope Pattern" signal.

2. Press R/C to set Picture NORMAL condition.

3. Connect the DC miliammeter between TP603 (+) and TP602 (–). (Full Scale: 3 mA Range)

4. Beam current must be within 990 ± 50 µA.

MODEL 20AR22 CHASSIS LAYOUT

20AR22 20AR32

654321

+ 32 hidden pages