JVC AV-21CS24, AV-21CX14 Service Manual

Page 1

SERVICE MANUAL

FLAT COLOUR TELEVISION

AV-21CS24 AV-21CX14

BASIC CHASSIS

1 PRECAUTION ......................................................................................................................................................... 1-3

2 SPECIFIC SERVICE INSTRUCTIONS ................................................................................................................... 1-4

3 DISASSEMBLY ....................................................................................................................................................... 1-8

4 ADJUSTMENT ...................................................................................................................................................... 1-14

5 TROUBLESHOOTING ........................................................................................................................................... 1-30

No.YA106

2004/7

Page 2

SPECIFICATION

Items

Dimentions (W x H x D) 50.2cm x 47.7cm x 47.2cm

Mass 22kg

TV RF System B, G, I, D, K, M

Colour System TV Mode PAL / SECAM / NTSC3.58 / NTSC 4.43

Video Mode PAL / SECAM / NTSC3.58 / NTSC4.43

Stereo System A2(B/G) / NICAM(B/G,I,D/K) Playback

Teletext system FLOF (Fastext), WST (World Standard Text) ---

Receiving Frequency VHF Low 46.25MHz ~ 140.25MHz (AS0 ~ S6)

VHF High 147.25MHz ~ 423.25MHz (S7 ~ S36)

UHF 431.25MHz ~ 863.25MHz (S37 ~ CHINA 57)

CATV Mid: X ~ Z, S1 ~ S10

Super: S11 ~ S20

Hyper: S21 ~ S41

Intermediate VIF 38.0MHz

Frequency SIF

Colour Sub Carrier Frequency 4.43MHz (PAL), 4.40MHz / 4.25MHz (SECAM), 3.58MHz / 4.43MHz (NTSC)

Aerial Input Terminal 75Ω unbalanced, coaxial

Power Input AC110V ~ AC240V, 50Hz / 60Hz

Power Consumption 88W (Max.) / 65 W (Avg.)

Picture Tube

Screen Size Visible size: 50.5cm (Diagonal) / 40.4cm x 30.3cm (H x V)

High Voltage 32kV -1.5kV / +1.0kV (at zero beam current)

Speaker 5cm x 9cm, oval type x 2

Audio Output 3W + 3W

Video / Audio Input Video [1/2] 1V (p-p), negative sync, 75Ω, RCA pin jack x 2

(1/2) Audio [1/2] 500mV (rms) (-4dBs), High impedance, RCA pin jack x 4

Video / Audio Output Video 1V (p-p), 75Ω, RCA pin jack x 1

Headphone 3.5mm stereo mini jack x1

Remote Control Unit RM-C1281-2H



D/K: 31.5MHz (6.5MHz) D/K: 31.5MHz (6.5MHz)

[NICAM: 32.15MHz (5.85MHz)] I: 32.0MHz (6.0MHz)

I: 32.0MHz (6.0MHz) B/G: 32.5MHz (5.5MHz)

[NICAM: 31.45MHz (6.55MHz)] M: 33.5MHz (4.5MHz)

B/G: 32.5MHz (5.5MHz)

[A2: 32.26MHz (5.74MHz)]

[NICAM: 32.15MHz (5.85MHz)

M: 33.5MHz (4.5MHz)

A51LXR195X

21-inch, aspect ratio 4:3, flat square face type, tinted

Audio

500mV (rms) (-4dBs), Low inpedance (400Hz when modulated 100%), RCA pin jack x 2

(AA/R06/UM-3 battery x 2)

AV-21CS24 AV-21CX14

Contents

Design & specifications are subject to change without notice.

1-2 (No. YA106)

Page 3

SECTION 1

PRECAUTION

1. 1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.

(2) Alterations of the design or circuitry of the products should

not be made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components

having such features are identified by shading on the schematics and by (

The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards.

(4) Don't short between the LIVE side ground and ISOLATED

(NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( GND, the ISOLATED (NEUTRAL) : ( EARTH : ( side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time with a measuring apparatus (oscilloscope etc.). If above note will not be kept, a fuse or any parts will be broken.

(5) If any repair has been made to the chassis, it is

recommended that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).

(6) The high voltage applied to the picture tube must conform

with that specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper minimum level of soft X-Ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product.

(7) Do not check high voltage by drawing an arc. Use a high

voltage meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10k 2W resistor to the anode button.

) on the parts list in Service manual.

) side

) side GND and

) side GND. Don't short between the LIVE

(8) When service is required, observe the original lead dress.

Extra precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.

(9) Isolation Check

(Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an

appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the service trade.

b) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).

Alternative Check Method

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Use an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500

Ω 10W resistor paralleled by a 0.15µF AC-type

capacitor between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER (HAVING 1000Ω/V, OR MORE SENSITIVITY)

0.15µF AC-TYPE

PLACE THIS PROBE

1500Ω 10W

Ω

GOOD EARTH GROUND

ON EACH EXPOSED ME TAL PART

(No. YA106) 1-3

Page 4

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2. 1 FEATURES

• New chassis design enables use of an interactive on-screen control.

• Pure flat CRT produces fine textured picture in every detail.

• Wide range voltage (110V ~ 240V) for AC power input.

• With AUDIO/VIDEO/S-VIDEO input terminals.

• I

C bus control utilizes single chip ICs.

• By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged

automatically.

• Built-in OFF TIMER & RETURN +.

2. 2 MAIN DIFFERENCE LIST

 Items AV-21CS24 AV-21CX14

 MAIN PWB ASS’Y SCW-1005A-H2 SCW-1010A-H2  FRONT CABINET ASS’Y GG10263-002A-H GG10263-003A-H

2.3 FUNCTIONS

REMOTE CONTROL UNIT

RM-C1281-2H

4 5 6

11 12 13 14 15 16 17

25 26 27 28 29 30 31

SOUND SYSTEM key

COLOUR SYSTEM key

FAVORITE CHANNEL keys

DISPLAY BACK key

MENU (OK) key

TEXT key

SOUND TURBO key

PICTURE MODE key

SOUND setting key (Stereo/Bilingual Ι/Bilingual ΙΙ/Monaural)

OFF TIMER key

RETURN + key

CHANNEL (-/+) keys

MODE key

INDEX key

REVEAL key

Not used

INPUT / STORE key

Not used

POWER key

TV / VIDEO key

MENU (/, /) keys

MUTING key

Number keys

-/-- key

VOLUME (-/+) keys

SUBPAGE key

HOLD key

CANCEL key

SIZE key

BASS key

CINEMA SURROUND key

1-4 (No. YA106)

Page 5

FRONT PANEL CONTROLS

REAR TERMINAL

L / M

IN (VIDEO-2)

HEADPHONE jack

IN (VIDEO-2) : VIDEO

IN (VIDEO-2) : AUDIO L/MONO

IN (VIDEO-2) : AUDIO R

MENU (OK) button

CHANNEL (-/+) buttons

NEL

6 7

VOLUME

VOLUME (-/+) buttons

Remote control sensor

POWER lamp

MAIN POWER button

POWER

4 5

VIDEO-1 INPUT TERMINAL

VIDEO

VIDEO-1

INPUT

OUTPUT

AUDIO L/MONO

AUDIO R

OUTPUT TERMINAL

VIDEO

MONO

AUDIO L

AUDIO R

Aerial input terminal

(No. YA106) 1-5

Page 6

2.3 MAIN CPU [MAIN PWB : IC701] PIN FUNCTION

Pin No.

10 XtalIn I 24.576MHz for system clock 11 XtalOut O 24.576MHz for system clock 12 VssA1 - GND 13 NECK I V-guard input/ I/O switch 14 CONT I 1.8V regulator control 15 V5P1 I +5V 16 Ph2 - Phase-2 filter 17 Ph1 - Phase-1 filter 18 Gnd1 - GND 19 SecPll - SECAM PLL decoupling 20 Dec8G - Bandgap decoupling 21 EW O East-West drive output 22 VDRB- O Vertical drive B output 23 VDRB+ O Vertical drive A output 24 Vif1 I Video IF input 1 25 Vif2 I Video IF input 2 26 Vsc - Vertical sawtooth capacitor 27 Iref I Reference current input 28 GndIF - GND 29 Sif1 I Sound IF input 1 30 Sif2 I Sound IF input 2 31 AGC O Tuner AGC output 32 EHT I EHT/overvoltage protection input 33

34 L3 I Audio-L2 input (left signal) 35 R3 I Audio-R2 input (right signal) 36 L_OUT O Audio L output 37 R_OUT O Audio R output 38 DecsDem - Decoupling sound demodulator 39

40 Gnd2 - GND 41 PllIf - IF-PLL loop filter 42 SifAgc - AGC sound IF 43 IfVo/FmRo/DvbO O Not used 44 NC O Not used 45 V8AudioSwitches I 8V 46 AgcSsif - AGC capacitor second sound IF 47 V5P2 I 5V 48 V_OUT O Video output 49 L1 I Audio-L1 input 50 R1 I Audio-R1 input 51 V3 I Video V2 input 52 C4 I Not used 53 Audio2InL I Not used 54 Audio2InR I Not used 55 V2/Y I Video V2 input 56 L2 I Not used 57 R2 I Not used 58 Y3/Cvbs I S-Video Y1 input 59 C1 I S-Video C1 input 60 A_L O Audio L output for audio power amplifier 61 A_R O Not used 62 HP_L O Not used

Pin name I/O Function

1 VssP2 - GND 2 VssC4 - GND 3 V1.8C4 I 1.8V (Digital) 4 V3.3A3 I 3.3V 5 VrefP_Sdac I 3.3V (Positive) 6 VrefN_Sdac - GND 7 VrefP_Sdac I 3.3V (Negative) 8 VrefN_Sdac - GND 9 VrefP_Sdac I 3.3V (Positive)

Ssif/RefIn/Avl/RefOut

QssO/AmO/AudeEm

O Automatic Volume Levelling / sound IF

input / subcarrier reference output / external reference signal input for I signal mixer for DVB operation

O QSS intercarrier output / AM output /

deemphasis / (front-end audio out)

Pin No.

63 HP_R O Not used 64 CVBSO/PIP O Not used 65 SVM O Not used 66 FbiSo I Flyback input/sandcastle output 67 Hout O Horizontal output 68 VssComb - GND 69 V5Comb I 5V 70 Vin/R2/Pr I PIP R input 71 Uin/B2/Pb I PIP B input 72 Yin/G2/Y I PIP G input 73 Ysync I Not used 74 Yout O Not used 75 Uout/INSSW2 I YUV insertion input 76 NC O Not used 77 INSSW3 I YUV insertion input 78 R3/Pr I Not used 79 G3/Y I Not used 80 B3/Pb I Not used 81 Gnd3 - GND 82 V5P3 I 5V 83 BCL I Beam current limiter input 84 BLKIN I Black current input 85 Rout O R output 86 Gout O G output 87 Bout O B output 88 V3.3A1 I 3.3V 89 RefAdN - GND 90 V3.3RefAdP I 3.3V (Positive) 91 RefAd I 3.3/2V 92 GndA - GND 93 V1.8A I 1.8V 94 V3.3A2 I 3.3V 95 VssADC - GND 96 V1.8ADC I 1.8V 97 REMOTE I Remote control 98 PW_LED I POWER LED control

99 PW_LED I POWER LED control 100 V1.8C2 I 1.8V 101 VssC2 - GND 102 TIMER - Not used 103 TIMER - Not used 104 VER_PROTECT O X-ray protect 105 S_REDUCE O Sound control 106 P00/I2SDI1 O Not used 107 POWER O SUB POWER control 108 SCL1 I I2C bus clock 109 SDA1 I/O I2C bus data 110 V3.3P I 3.3V

111 ROTATION O Not used 112 3.58/OTHER O NTSC 3.58 detection 113 A_MUTE O Audio muting 114 4.5/OTHER O NTSC 4.43 detection 115 PROT I Protect 116 ECO_IN I ECO sensor level detection 117 V1.8C1 I 1.8V (Digital) 118 DecV1V8 I 1.8V 119 KEY_IN I Key scan data 120 VDO_DET I Video DET input 121 VSSC1+P1 - Digital GND 122 S_V_DET I S-Video DET input 123 P25/PWM4 O GTVA_reset 124 V1.8C3 I 1.8V (Digital) 125 VssC3 - GND 126 P12/Int2 I External interrupt 127 SDA0 I/O I2C sub data (for memory) 128 SCL0 I I2C sub clock (for memory)

Pin name I/O Function

1-6 (No. YA106)

Page 7

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

• Unplug the power cord. (1) Remove the 5 screws [A] and 2 screws [B] as shown

in Fig.1.

(2) Withdraw the REAR COVER toward you.

CAUTION:

When reinstalling the rear cover, carefully push it inward after inserting the MAIN PWB into the REAR COVER groove.

3.1.2 REMOVING THE MAIN PW BOARD

• Remove the REAR COVER. (1) Slightly raise the both sides of the MAIN PWB by hand. (2) Withdraw the MAIN PWB backward.

(If necessary, take off the wire clamp and connectors, etc.)

3.1.3 REMOVING THE SPEAKER

• Remove the REAR COVER. (1) Remove the 4 screws [C] as shown in Fig.1. (2) Follow the same steps when removing the other hand

SPEAKER.

3.1.4 CHECKING THE MAIN PW BOARD

• To check the back side of the MAIN PWB. (1) Pull out the MAIN PWB. (Refer to REMOVING THE MAIN

PW BOARD).

(2) Erect the MAIN PWB vertically so that you can easily

check its back side.

CAUTIONS:

• Before turning on power, make sure that the CRT earth wire and other connectors are properly connected.

• When repairing, connect the DEG. COIL to the DEG. connector on the MAIN PWB.

3.1.5 WIRE CLAMPING AND CABLE TYING

(1) Be sure to clamp the wire. (2) Never remove the cable tie used for tying the wires

together. Should it be inadvertently removed, be sure to tie the

wires with a new cable tie.

(No. YA106) 1-7

Page 8

FRONT CABINET

PICTURE TUBE

MAIN PWB (CRT SOCKET PWB)

SPEAKER

(x4)

MAIN PWB

FBT

SPEAKER

(x4)

REAR COVER

(x5)

(x2)

1-8 (No. YA106)

Fig. 1

Page 9

3.2 REPLACEMENT OF MEMORY IC

3.2.1 MEMORY IC

This TV uses the following memory IC.

Memory IC: IC702 on MAIN PWB

The memory IC memorizes data for correctly operating the video and deflection circuits. When replacing the memory IC, be sure to use the same type IC written with the initial values of data. In other words, use the specific IC listed in “PRINTED WIRING BOARD PARTS LIST”. For its mounting location, refer to “ADJUSTMENT LOCATIONS”.

3.2.2 PROCEDURE FOR REPLACING MEMORY IC

1. Power off

Switch the power off and unplug the power cord from the wall outlet.

2. Replacing the memory IC

Replace the memory IC with new one. Be sure to use the memory IC written with the initial data values.

3. Power on

Plug the power cord into the wall outlet and switch the power on.

4. Check and setting of SYSTEM CONSTANT SET:

(1) Press the [DISPLAY] key and the [PICTURE MODE]

key on the remote control unit simultaneously. The SERVICE MENU screen will be displayed.(See Fig.1.)

(2) In the SERVICE MENU, press the [DISPLAY] key and

[PICTURE MODE] key simultaneously. Then, the SYSTEM CONSTANT SET screen will be displayed.(See Fig.2.)

(3) Check whether the setting values of the SYSTEM

CONSTANT SET are the same as those indicated in Table1. If the value is different, select the setting item with the MENU [ with the MENU

]/[] key, and set the correct value

[]/[] key.

(4) Press the [DISPLAY] key twice to return to the normal

screen.

5. Receive channel setting

Refer to the OPERATING INSTRUCTIONS and set the receive channels (channels preset).

6. User setting

Check the user setting values in Table 2 and Table 3. If setting value is different, set the correct value. For setting, refer to the OPERATING INSTRUCTIONS.

7. Setting of SERVICE MENU

Verify the setting for each setting item in the SERVICE MENU.(See Table 4.) If readjustment is necessary, perform adjustment referring to “ADJUSTMENTS PROCEDURE”.

NAME OF REMOTE CONTROL KEYS

SERVICE MENU

1. IF

3. AUDIO

5. VSM W/B

7. PLUG & PLAY (OFF)

1-7 : SELECT DISPLAY : EXIT

******* **** ***** ***** **** **** *** ***

Fig. 1

SYSTEM CONSTANT-1

SYSTEM CONSTANT SET 1

SYSTEM COMB TILT SUPER BASS TEXT LANGUAGE

: SEL  : OPE



SYSTEM CONSTANT-2

SYSTEM CONSTANT SET 2

SOUND BILINGUAL BLUE BACK MUTE COLOUR AUTO ECO SENSOR

: SEL  : OPE



SYSTEM CONSTANT-3

SYSTEM CONSTANT SET 3

SURROUND

: SEL  : OPE



2. V/C

4. DEF

6. S TATUS

: MULTI

DISP : EXIT

NO NO NO SINGLE ERCMI

STEREO NO NO NO NO

YES NOPICTURE BOOSTER NOCOMPONENT NOPIP NOS INPUT

DISP : EXIT

DISPLAY / BACK

PICTURE MODE

Fig. 2

(No. YA106) 1-9

Page 10

3.2.3 FACTORY SHIPMENT SETTING VALUE

SETTING OF SYSTEM CONSTANT SET

Setting item Setting content

Setting value

AV-21CS24 AV-21CX14

SYSTEM MULTI ←

COMB NO ←

TILT NO ←

SUPER BASS NO ←

TEXT SINGLE NO

LANGUAGE E/R/C/M/I ←

SOUND STEREO PB

BILINGUAL NO ←

BLUE BACK MUTE NO ←

COLOUR AUTO NO ←

SURROUND YES ←

PICTURE BOOSTER NO ←

COMPONENT NO ←

S INPUT NO ←

MULTI TRIPLE PAL THAI

YES NO

SINGLE NO PAT

E/R/C/M/I E/C

STEREO PB MONO

YES NO

Table 1

1-10 (No. YA106)

Page 11

SETTING OF BASIC FUNCTIONS

Setting item Setting value

SERVICE MENU SETTING ITEMS

Setting item Setting value

POWER Off

SUB POWER On

VOLUME 15

COLOR SYSTEM PAL

SOUND SYSTEM B/G

PICTURE MODE(VSM) BRIGHT

CINEMA SURROUND OFF

OFF TIMER OFF

STEREO MODE STEREO[AV-21CS24]

CHANNEL POSITION PR1

Table 2

SETTING OF MENU SCREEN

Setting item Setting value

INPUT TV

VNR AUTO

COMPRESS (16:9) OFF

PICTURE TILT 

AUTO SHUTOFF OFF

CHILD LOCK OFF

BLUE BACK ON

VIDEO-2 SET VIDEO

AUTO PROGRAM Refer to OPERATING INSTRUCTIONS

EDIT / MANUAL Refer to OPERATING INSTRUCTIONS

LANGUAGE ENG

TEXT LANGUAGE GROUP-1[AV-21CS24]

TINT Centre

COLOUR Centre

BRIGHT Centre

CONT Maximum

SHARP Centre

BALANCE Centre

SOUND MODE DYNAMIC

SOUND TURBO OFF

AI VOLUME ON

FAVORITE CH RED PRO1

FAVORITE CH GREEN PRO2

FAVORITE CH YELLOW PRO3

FAVORITE CH BLUE PRO4

Table 3

1. IF 1. VCO

2. DELAY POINT

2. V/C 1. SCREEN

2. CUTOFF(B/G)

3. WDR(R/G/B)

4. BRIGHT(TV/VDO 1/2/3)

CONT(TV/VDO 1/2/3/TV 16:9/VDO 16:9)

6. COLOUR(TV/VDO 1/2/3/DVD)

7. TINT(TV/VDO 1/2/3)

8. SHARP

9. Y DELAY

10. TINT DVD

11. AMP T. SHARP

3. AUDIO 1. DCXO ADJ

[AV-21CS24] 2. NICAM lower ERRLIM

3. NICAM upper ERRLIM

4. A2 ID THR

5. MENU EQUALIZER

4. DEF 1. V-SHIFT

2. V-SLOPE

3. V-SIZE

4. H-CENT

5. H-SIZE

6. TRAPEZ

7. EW-PIN

8. COR-UP

9. COR-LO

10. ANGLE

11. BOW

12. V-S.CR

13. V-LIN

14. V-ZOOM

15. V-SCROLL

5. VSM W/B 1. BRIGHT

(BRIGHT/STANDARD/SOFT) 2. CONT

3. COLOUR

4. SHARP

5. HUE

(COOL/WARM/NORMAL) 1. R DRIVE

2. G DRIVE

3. B DRIVE

6. STATUS

[Display only]

7. PLUG & PLAY(ON)

[Display only]

[Do not adjust]

Table 4

(No. YA106) 1-11

Page 12

3.3 REPLACEMENT OF CHIP COMPONENT

3.3.1 CAUTIONS

(1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it.

3.3.2 SOLDERING IRON

(1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts.

3.3.3 REPLACEMENT STEPS

1. How to remove Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

(2) Shift with tweezers and remove the chip part.

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove the chip part.

Note :

After removing the part, remove remaining solder from the pattern.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead A as indicated in the figure.

(4) Then solder leads B and C.

1-12 (No. YA106)

Page 13

SECTION 4

ADJUSTMENT

4. 1 ADJUSTMENT PREPARATION

(1) You can make the necessary adjustments for this unit with either the remote control unit or with the adjustment

equipment and parts as given below.

(2) Adjustment with the remote control unit is made on the basis of the initial setting values, however, the new setting

values used for setting the screen to its optimum condition may differ from the initial settings.

(3) Make sure that AC power is turned on correctly. (4) Turn on the power for the set and test equipment before use, and start the adjustment procedures after waiting at least 30

minutes. (5) Unless otherwise specified, prepare the most suitable reception or input signal for adjustment. (6) Never touch any adjustment parts, which are not specified in the list for this variable resistors, transformers, trimmer

capacitors, etc.

4. 2 PRESETTING BEFORE ADJUSTMENT

Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit.

User mode setting position

Setting item Setting value

PICTURE MODE (VSM) BRIGHT

TINT, COLOUR, BRIGHT, SHARP Centre

CONT Maximum

VNR OFF

BALANCE Centre

SOUND TURBO OFF

CINEMA SURROUND OFF

COMPRESS 4:3

4. 3 MEASURING INSTRUMENT AND FIXTURES

(1) DC voltmeter (or Digital voltmeter) (2) Oscilloscope (3) Signal generator (Pattern generator) [PAL/SECAM/NTSC] (4) Remote control unit

4.4 ADJUSTMENT ITEMS

 B1 VOLTAGE

 FOCUS ADJUSTMENT

 IF CIRCUIT ADJUSTMENTS

• IF VCO adjustment

• DELAY POINT (AGC TAKE-OVER) adjustment

 VIDEO CIRCUIT ADJUSTMENTS

• WHITE BALANCE (Low light) adjustment

• WHITE BALANCE (High light) adjustment

• SUB BRIGHT adjustment

• SUB CONTRAST adjustment

• SUB COLOUR 1 adjustment

• SUB COLOUR 2 adjustment

• SUB TINT 1 adjustment

• SUB TINT 2 adjustment

 AUDIO SETTING

 DEFLECTION CIRCUIT ADJUSTMENTS

• V.SLOPE adjustment

• V.POSITION adjustment

• V.HEIGHT adjustment

• H.POSITION adjustment

• V.LINEARITY adjustment

• H. PARALLEL adjustment

• H.BOW adjustment

 VSM PRESET SETTING  PURITY AND CONVERGENCE ADJUSTMENTS

• PURITY adjustment

• STATIC CONVERGENCE adjustment

• DYNAMIC CONVERGENCE adjustment

(No. YA106) 1-13

Page 14

4. 5 ADJUSTMENT LOCATIONS

POWER CORD

DEG COIL

MAIN PWB ASS'Y

POWER SW

S901

DEG

S804 S802

S805 S803 S801

IC701

J804J801

TU001

J808

GND 5V

CN00C

1. 5V

2. SCL0

3. SDA0

4. SCL1

5. SDA1

6. GND

J807

IC702

J809

J806

CN00S

GND

CN00X

1. B1

2. NC

3. X-RAY2

4. X-RAY1

5. GND

MAIN PWB ASS'Y (CRT SOCKET)

(SOLDER SIDE)

FRONT

DEF

HVT

UPPER : FOCUS

LOWER : SCREEN

YOKE

TOP

1-14 (No. YA106)

TP-47G

TP-E

TP-47R

TP-47B

CRT EARTH

(BRAIDED ASS'Y)

Page 15

4.6 BASIC OPERATION IN SERVICE MENU

Operate the SERVICE MENU with the remote control unit.

4.6.1 SERVICE MENU ITEMS

With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings:

1. IF For entering/adjusting the setting values (adjustment values) of the IF circuit.

2. V/C For entering/adjusting the setting values (adjustment values) of the VIDEO circuit.

3. AUDIO For entering/adjusting the setting values (adjustment values) of the AUDIO circuit.

4. DEF For entering/adjusting the setting values (adjustment values) of the DEFLECTION circuit.

5. VSM W/B For setting the values of STANDARD, SOFT, BRIGHT and COOL, NORMAL, WARM.

6. STATUS This is not used for service. PLUG & PLAY (ON)

4.6.2 BASIC OPERATION IN SERVICE MENU

1. HOW TO ENTER SERVICE MEN

Press the [DISPLAY] key and the [PICTURE MODE] key on the remote control unit simultaneously. The SERVICE MENU screen will be displayed. (See Fig. 1 on the next page.)

2. SELECTION OF SUB MENU SCREEN

Press one of the keys 1 to 6 on the remote control unit, and select the SUB MENU SCREEN from the SERVICE MENU. (See Fig.1 on the next page.)

SERVICE MENU

1. IF 5. VSM W/B

2. V/C 6. STATUS

3. AUDIO 7. PLUG & PLAY (ON)

4. DEF

This is not used for service.

→ SUB MENU

3. METHOD OF SETTING

NOTES:

• Once the setting values are set, they are memorized automatically.

• It must not be adjusted without inputting a signal.

(1) 1. IF

[1.VCO ] : Under normal conditions, no adjustment is required.

(a) [1] key Select 1. IF. (b) [1] key Select 1. VCO. (c) [DISPLAY] key When this is pressed twice, you will return to the SERVICE MENU.

[2.DELAY POINT ]

(a) [1] key Select 1. IF. (b) [2] key Select 2. DELAY POINT. (c)

MENU []/[] key

(d) [DISPLAY] key When this is pressed twice, you will return to the SERVICE MENU.

(2) 2. V/C, 3. AUDIO and 4. DEF

(a) [2] ~[4] keys Select one from 2. V/C and 3. AUDIO, 4. DEF. (b)

MENU []/[] key

MENU []/[] key

(c)

(d) [DISPLAY] key When this is pressed, you will return to the SERVICE MENU.

(3) 5. VSM W/B

(a) [5] key Select 5. VSM W/B. (b) MENU [OK] key Select preset items. (c)

MENU []/[] key

(d)

MENU []/[] key

(e) [DISPLAY] key When this is pressed, you will return to the SERVICE MENU.

Adjust the setting value.

Select setting items. Adjust the setting values of the setting items.

Use the number keys on the remote control unit for setting the WHITE BALANCE. For the setting, refer to each item concerned.

Adjust setting items. Adjust the setting values of the setting items.

(4) 6. STATUS

This is for display only.

(5) 7. PLUG & PLAY (ON)

This is not used for service.

4. Release of SERVICE MENU

After completing the setting, return to the SERVICE MENU by pressing the [DISPLAY] key, then again press the [DISPLAY] key to return to the normal screen.

(No. YA106) 1-15

Page 16

4.6.3 SERVICE MENU FLOW CHART

SERVICE MENU

1. IF

3. AUDIO

5. VSM W/B

7. PLUG & PLAY (ON)

1-7 : SELECT DISPLAY : EXIT

******* **** ***** ***** **** **** *** ***

2. V/C

4. DEF

6. STATUS

IF SERVICE MENU

1. VCO

2. DELAY POINT

V/C

1. SCREEN

1. IF

2. V/C

PAL

HBC

WBC

BRI

VCO (CW)

TOO HIGH ABOVE REFERENCE JUST REFERENCE BELOW REFERENCE TOO LOW

DELAY POINT

AGC TAKEOVER

Setting item

1. SCREEN

2. CUTOFF (B/G)

** ** **

3. WDR (R/G/B)

4. BRIGHT (TV/VDO1/2/3)

5. CONT (TV/VDO1/2/3/TV 16:9/VDO16:9)

6. COLOUR (TV/VDO1/2/3/ DVD)

7. TINT (TV/VDO1/2/3)

8. SHARP (TV/VDO1/2/3) Y DELAY (TV/VDO1/2/3

/S-DVO)

10. TINT DVD (DVD)

11. AMP T.SHARP

*****

MHz

6. STATUS

STATUS

V/C STATUS

ECO EOF NOL VNR

***********

COSMIC STATUS

** ** ** ** ** ** ** **

5. VSM W/B

VSM PRESET BRIGHT

1. BRIGHT

***

1. BRIGHT

2. CONT

3. COLOUR

4. SHARP

5.HUE

Setting item

1. R-DRIVE

2. G-DRIVE

3. B-DRIVE

3. AUDIO

AUDIO

1. DCXO ADJ. = NOT NICAM

0002

0009

000A

***

******* *******

*******

4. DEF

DEF FULL 50Hz

1. V-SHIFT

***

(**)

Setting item

1. DCXO ADJ

2. NICAM lower ERRLIM

3. NICAM upper EERLIM

4. A2 ID THR

MENU EQUALIZER DYNAMIC MUSIC NEWS USER

4 : 3 / 16 : 9

Setting item

1. V-SHIFT

2. V-SLOPE

3. V-SIZE

4. H-CENT

5. H-SIZE

6. TRAPEZ

7. EW-PIN

8. COR-UP

Setting value (Hexadecimal)

Setting value

Sereen size

9. COR-LO

10. ANGLE

11. BOW

12. V-S. CR

13. V-LIN

14. V-ZOOM

15. V-SCROLL

1-16 (No. YA106)

Fig. 1

Page 17

4.7 ADJUSTMENT PROCEDURE

4.7.1 B1 VOLTAGE

Item

Measuring

instrument

Test point Adjustment part Description

B1 VOLTAGE check

Signal generator

DC voltmeter

4.7.2 FOCUS ADJUSTMENT

Item

FOCUS adjustment

Measuring

instrument

Signal generator

B1 (pin 1) GND (pin 5) [CN00X connector

(1) Receive a black and white signal. (2) Connect a DC voltmeter between B1 and GND (between

pins 1 and 5 of the connector CN00S).

(3) Make sure that the voltage is DC134.5V ± 2V. in MAIN PWB]

Test point Adjustment part Description

FOCUS VR [In HVT]

Notes:

• Set PICTURE MODE (VSM) to “BRIGHT”.

• The final adjustment of CONVERGENCE must be done

after the FOCUS adjustment. (CONVERGENCE is affected by the FOCUS adjustment.) If any aeviation in CONVERGENCE is found, PURITY must be adjusted to restore the convergence.

(1) Receive a crosshatch signal.

(2) Adjust the FOCUS VR so that the vertical and horizontal

lines will be clear and in fine detail on the screen.

(3) Make sure that the picture is in focus even when the screen

gets darkened.

4.7.3 IF CIRCUIT ADJUSTMENTS

Item

IF VCO check

DELAY POINT (AGC

Measuring

instrument

Remote control unit

VCO (CW)

TOO HIGH ABOVE REFERENCE JUST REFERENCE BELOW REFERENCE TOO LOW

Remote control unit

Test point Adjustment part Description

. MHz

DISPLAY : EXIT

TAKE-OVER) adjustment

Adjustment item

NTSC 3.58

2. DELAY POINT

(AGC TAKE-OVER)

[1. IF]

1. VCO (CW)

Receiving frequenc

YELLOW

[1. IF]

2. DELAY POINT

Initial setting value

OTHERS

VHF UHF VHF UHF

323232

Note:

• Under normal conditions, no adjustment is required.

(1) Receive a broadcast signal.

(2) Select 1. IF from the SERVICE MENU.

(3) Select 1. VCO.

(4) Check the characters colour of the JUST REFERENCE

displayed to yellow.

(5) Press the [DISPLAY] key three times to return to normal

screen.

(1) Receive a black and white broadcast signal (colour off).

(2) Select 1. IF from the SERVICE MENU.

(3) Select 2. DELAY POINT.

(4) Adjust in order to eliminate any noise or beat from the

image. Any increase above the initial value produces the noise and any decrease below it produces the beat.

(5) Press the [DISPLAY] key three times to return to the normal

screen.

(6) Turn to other channels and make sure that there are no

irregularities.

(No. YA106) 1-17

Page 18

4.7.4 VIDEO CIRCUIT ADJUSTMENTS

• The setting (adjustment) using the remote control unit is made on the basis of the initial setting values.

• The setting values which adjust the screen to the optimum condition can be different from the initial setting values.

• Do not change the initial setting values of the setting (adjustment) items not listed in “ADJUSTMENT PROCEDURE”.

• The initial setting values in parenthesis ( ) are fixed offset values, needing no further adjustment.

Adjustment item

1. 1.SCREEN BRI 0 ~ 63 32 32 32 32

2. 2.CUT OFF B 0 ~ 63 11 11 11 11 G 0 ~ 63 7 7 7 7

3. 3.WDR R 0 ~ 63 32 32 32 3 2 G 0 ~ 63 32 32 32 32 B 0 ~ 63 45 45 45 45

4. 4.BRIGHT RF 0 ~ 63 39 39 39 39 VIDEO 1(COMPOSITE) (-32 ~ +31) (+1) (+1) (+1) (+1) VIDEO 2(COMPOSITE) (-32 ~ +31) (-1) (-1) (-1) (-1)

5. 5.CONT. RF 0 ~ 63 32 32 32 32 VIDEO (-32 ~ +31) (-5) (-5) (-5) (-5)

6. 6.COLOUR RF 0 ~ 63(-32 ~ +31) 4 2 32 37 0 VIDEO (-32 ~ +31) (+4) (+1) (+2) (-1)

7. 7.TINT RF 0 ~ 63(-32 ~ +31) --- --- 27 (+2) VIDEO (-32 ~ +31) --- --- (-1) (-1)

8. 8.SHARP RF 0 ~ 63 5 5 55 55 55 VIDEO 0 ~ 63 55 55 55 55

9. 9.Y DELAY RF 0 ~ 15 5 5 5 5 VIDEO 0 ~ 15 5 5 5 5

10. 10.TINT DVD RF VIDEO 0 ~ 63 3 4 4 1 2 9 2 9

11. 11.AMP T.SHARP RF / VIDEO 0 ~ 63 0 0 0 0

Variable range

Initial setting value

PAL SECAM NTSC3.58 NTSC4.43

1-18 (No. YA106)

Page 19

Item

Measuring

instrument

Test point Adjustment part Description

WHITE BALANCE (Low light) adjustment

B CUTOFF (

Signal generator

Remote control unit

2. CUTOFF

REMOTE CONTROL UNIT

12 3





)

789

)

V/C

[2. V/C]

2.CUTOFF (B)

2.CUTOFF (G)

SCREEN VR [In HVT]

PAL

(B)

(**)

(G)

G CUTOFF ( )

G CUTOFF (

)

(



Note:

• Set PICTURE MODE (VSM) to “BRIGHT”.

(1) Receive a PAL black and white signal (colour off). (2) Select 2. V/C from the SERVICE MENU. (3) Select 2. CUTOFF (B) and (G). (4) Set each value to initial setting value with the [4] / [7] keys

and [5] / [8] keys.

(5) Turn the SCREEN VR fully counterclockwise, then slowly

turn it clockwise to where a red, blue or green colour is faintly visible.

(6) Use the [4] / [7] and [5] / [8] keys to adjust so that the

other 2 colours appear white.

(7) Turn the SCREEN VR to where the single horizontal line

glows faintly. (8) Press the [2] key to return to 2. CUTOFF screen. (9) Press the [DISPLAY] key twice to return to the normal

screen.

Adjustment Item

2. CUTOFF

B 0 ~ 63 11

G 0 ~ 63 7

)

Variable Initial setting

range value

WHITE BALANCE (High light) adjustment

R DRIVE (

Signal generator

[2. V/C]

3.WDR (R)

3.WDR (G)

Remote

3.WDR (B)

control unit

V/C

3. WDR

REMOTE CONTROL UNIT

12 3

) B DRIVE ()





789

)

PAL

(R)

(G) (B)

G DRIVE ()

B DRIVE (

G DRIVE (

(**)

(

** **(**

Notes:

• Proceed to the following adjustment after having completed

the WHITE BALANCE (Low light) adjustment.

• Set PICTURE MODE (VSM) to “BRIGHT”.

(1) Receive a PAL black and white signal (colour off). (2) Select 2. V/C from the SERVICE MENU. (3) Select 3. WDR (R), (G) and (B). (4) Set each value to initial setting value with the [4] to [9]

)



)



)

keys. (5) Use the [4] to [9] keys to produce a white screen. (6) Press the [DISPLAY] key twice to return to the normal

screen.

Adjustment Item

Variable Initial setting

range value

R 0 ~ 63 32

3. WDR G 0 ~ 63 32

B 0 ~ 63 45

(No. YA106) 1-19

Page 20

Item

Measuring

instrument

Test point Adjustment part Description

SUB BRIGHT adjustment

SUB CONTRAST adjustment

Remote control unit

[2. V/C]

4. BRIGHT

[2. V/C]

5. CONT

Notes:

• Proceed to the following adjustment after having completed

the WHITE BALANCE (Low light) and WHITE BALANCE (High light) adjustment.

• Set PICTURE MODE (VSM) to “BRIGHT”.

(1) Receive a broadcast. (2) Select 2. V/C from the SERVICE MENU. (3) Select 4. BRIGHT. (4) Set the initial setting value. (5) If the brightness is not best with the initial setting value,

make fine adjustment until you get the best brightness.

(6) Press the [DISPLAY] key twice to return to the normal

screen.

Notes:

• Proceed to the following adjustment after having completed

the SUB BRIGHT adjustment.

• Set PICTURE MODE (VSM) to “BRIGHT”.

(1) Receive a broadcast. (2) Select 2. V/C from the SERVICE MENU. (3) Select 5. CONT. (4) Set the initial setting value. (5) If the contrast is not best with the initial setting value,

make fine adjustment until you get the best contrast.

(6) Press the [DISPLAY] key twice to return to the normal

screen.

SUB COLOUR 1 adjustment

Remote control unit

[2. V/C]

6. COLOUR

[Method of adjustment without measuring instrument] Notes:

• Proceed to the following adjustment after having completed

the SUB CONTRAST adjustment.

• Set PICTURE MODE (VSM) to “BRIGHT”.

- PAL COLOUR -

(1) Receive a PAL broadcast. (2) Select 2. V/C from the SERVICE MENU. (3) Select 6. COLOUR. (4) Set the initial setting value for PAL COLOUR. (5) If the colour is not best with the initial setting value, adjust

until you get the best colour.

(6) Press the [DISPLAY] key twice to return to the normal

screen.

- SECAM COLOUR -

(1) Receive a SECAM broadcast. (2) Press the [COLOUR SYSTEM] key to select the SECAM

colour system.

(3) Adjust SECAM COLOUR in the same way as for “PAL

COLOUR”.

- NTSC 3.58 COLOUR -

(1) Receive a NTSC 3.58MHz broadcast. (2) Press the [COLOUR SYSTEM] key to select the NTSC

3.58 colour system.

(3) Adjust NTSC 3.58 COLOUR in the same way as for “PAL

COLOUR”.

- NTSC 4.43 COLOUR -

When adjustment is done for NTSC 3.58 COLOUR, appropriate values are automatically set for NTSC 4.43 COLOUR.

1-20 (No. YA106)

Page 21

Item

SUB COLOUR 2 adjustment

Measuring

instrument

Signal generator

Oscilloscope

Remote control unit

Test point Adjustment part Description

TP-47G TP-E [CRT SOCKET PWB]

[2. V/C]

6. COLOUR

[Method of adjustment using measuring instrument] Notes:

• Proceed to the following adjustment after having completed

the SUB CONTRAST adjustment.

• Set PICTURE MODE (VSM) to “BRIGHT”.

- PAL COLOUR -

(1) Receive a PAL colour bar signal (full field colour bar 75%

white). (2) Select 2. V/C from the SERVICE MENU. (3) Select 6. COLOUR. (4) Set the initial setting value of PAL COLOUR. (5) Connect the oscilloscope between TP-47G and TP-E. (6) Adjust PAL COLOUR to set the value (A) in the figure to

+10V.

(A)

(–) 0V

(+)

- SECAM COLOUR -

(1) Receive a SECAM colour bar signal (colour bar 75%

white). (2) Press the [COLOUR SYSTEM] key to select the SECAM

colour system. (3) Set the initial setting value of SECAM COLOUR. (4) Adjust SECAM COLOUR to set the value (A) in the figure

to +4V.

- NTSC 3.58 COLOUR -

(1) Receive a NTSC 3.58 colour bar signal (full field colour

bar 75% white). (2) Press the [COLOUR SYSTEM] key to select the NTSC

3.58 colour system. (3) Set the initial setting value of NTSC 3.58 COLOUR. (4) Adjust NTSC 3.58 COLOUR to set the value (A) in the

figure to -1V.

- NTSC 4.43 COLOUR -

When adjustment is done for NTSC 3.58 COLOUR, appropriate values are automatically set for NTSC 4.43 COLOUR.

SUB TINT 1 adjustment

Signal generator

Remote control unit

[2. V/C]

7. TINT

[Method of adjustment without measuring instrument]

Notes:

• Proceed to the following adjustment after having completed

the SUB CONTRAST adjustment.

• Set PICTURE MODE (VSM) to “BRIGHT”.

- NTSC 3.58 TINT -

(1) Receive a NTSC 3.58 colour bar signal (full field colour

bar 75% white).

(2) Press the [COLOUR SYSTEM] key to select the NTSC

3.58 colour system. (3) Select 2. V/C from the SERVICE MENU. (4) Select 7. TINT. (5) Set the initial setting value of NTSC 3.58. (6) If you cannot get the best tint with the initial setting value,

make fine adjustment until you get the best tint.

(7) Press the [DISPLAY] key twice to return to the normal

screen.

- NTSC 4.43 TINT -

When adjustment is done for NTSC 3.58 TINT, appropriate values are automatically set for NTSC 4.43 TINT.

(No. YA106) 1-21

Page 22

Item

Measuring

instrument

Test point Adjustment part Description

SUB TINT 2 adjustment

Signal generator

Oscilloscope

Remote control unit

(B)

TP-47G TP-E [CRT SOCKET PWB]

[2. V/C]

7. TINT

(–) 0V (+)

[Method of adjustment using measuring instrument]

Notes:

• Proceed to the following adjustment after having completed

the SUB CONTRAST adjustment.

• Set PICTURE MODE (VSM) to “BRIGHT”.

- NTSC 3.58 TINT -

(1) Receive a NTSC 3.58 colour bar signal (full field colour

bar 75% white).

(2) Press the [COLOUR SYSTEM] key to select the NTSC

3.58 colour system. (3) Select 2. V/C from the SERVICE MENU. (4) Select 7. TINT. (5) Set the initial setting value of NTSC 3.58. (6) Connect the oscilloscope between TP-47G and TP-E. (7) Adjust NTSC 3.58 TINT to set the value (B) in the figure to

0V.

(8) Press the [DISPLAY] key twice to return to the normal

screen.

- NTSC 4.43 TINT -

When adjustment is done for NTSC 3.58 TINT, appropriate values are automatically set for NTSC 4.43 TINT.

4.7.5 AUDIO SETTING [AV-21CS24]

This submenu is for display only, no adjustment is required.

Function Item Setting value

AUDIO 1. DC XO ADJ FOH

2. NICAM LOWER ERR LIM 6FH

3. NICAM UPPER ERR LIM BOH

4. A2 ID THR 00H

Function Item 100Hz 300Hz 1kHz 3kHz 8kHz

MENU EQUALIZER DYNAMIC +4 +3 -10 +3 +4

MUSIC +7 +2 +5 +2 +7 NEWS -6 +1 +6 +1 -6 USER 0 0 0 0 0

1-22 (No. YA106)

Page 23

4.7.6 DEFLECTION CIRCUIT ADJUSTMENTS

• The setting (adjustment) using the remote control unit is made on the basis of the initial setting values.

• The setting values which adjust the screen to the optimum condition can be different from the initial setting values.

• When performing deflection circuit adjustment, adjusts PAL signal (fv: 50 Hz) in 4:3 mode, and adjust the NTSC signal (fv:

60 Hz) similarly.

Note:

Proceed to the following adjustment after having completed the adjustments of SUB BRIGHT and SUB PICTURE.

4. DEF

Variable range

Adjustment item

4:3

50Hz

Others

1. V-SHIFT 0 ~ 63 -32 ~ +31 +32* 0*

2. V-SLOPE 0 ~ 63 -32 ~ +31 +32* 0*

3. V-SIZE 0 ~ 63 -32 ~ +31 +38* 0*

4. H-CENT 0 ~ 63 -32 ~ +31 +32* 0*

5. H-SIZE 0 ~ 63 -32 ~ +31 0 0

6. TRAPEZ 0 ~ 63 -32 ~ +31 0 0

7. EW-PIN 0 ~ 63 -32 ~ +31 0 0

8. COR-UP 0 ~ 63 -32 ~ +31 0 0

9. COR-LO 0 ~ 63 -32 ~ +31 0 0

10. ANGLE 0 ~ 63 -32 ~ +31 +32* 0*

11. BOW 0 ~ 63 -32 ~ +31 +32* 0*

12. V-S.CR 0 ~ 63 -32 ~ +31 +32* 0*

13. V-LIN 0 ~ 63 -32 ~ +31 +32* 0*

14. V-ZOOM 0 ~ 63 -32 ~ +31 (+25) (0)

15. V-SCROLL 0 ~ 63 -32 ~ +31 (+32) (0)

The value with an saterisk* is variable for adjustment. The values in parenthesis ( ) are fixed.

Note:

Initial setting value

4:3

50Hz

60Hz

Item

V. SLOPE adjustment

V. POSITION adjustment

Measuring

instrument

Signal generator

Remote control unit

Signal generator

Remote control unit

Test point Adjustment part Description

[4. DEF]

2. V-SLOPE

- PAL V. SLOPE -

(1) Receive a PAL circle pattern signal of vertical frequency

50Hz. (2) Select 4. DEF from the SERVICE MENU. (3) Select 2. V-SLOPE. (4) Set the initial setting value of 2. V-SLOPE. (5) Adjust 2. V-SLOPE to make “A = B”. (6) Press the [DISPLAY] key to refurn to SERVICE MENU

Blanking line

screen.

- NTSC V. SLOPE -

(1) Receive a NTSC circle pattern signal of vertical frequency

60Hz. (2) Make similar adjustment of NTSC V- SLOPE in the same

[4. DEF]

1. V-SHIFT

way as for

- PAL V. POSITION -

(1) Receive a PAL circle pattern signal of vertical frequency

“PAL V-SLOPE”.

50Hz. (2) Select 1. V-SHIFT. (3) Set the initial setting value of 1. V-SHIFT. (4) Adjust 1. V-SHIFT to make “A = B”.

- NTSC V. POSITION -

(1) Receive a NTSC circle pattern signal of vertical frequency

60Hz. (2) Make similar adjustment of NTSC V. POSITION in the

same way as for “PAL V. POSITION”.

(No. YA106) 1-23

Page 24

Item

Measuring

instrument

Test point Adjustment part Description

V. HEIGHT adjustment

Screen

size

92%

H. POSITION adjustment

Signal generator

[4. DEF]

3. V-SIZE

14. V-ZOOM Remote control unit

Picture size 100%

Signal generator

[4. DEF]

4. H-CENT

Remote control unit

- PAL V. HEIGHT -

(1) Receive a PAL crosshatch signal. (2) Select 3. V-SIZE. (3) Set the initial setting value of 3. V-SIZE. (4) Select 14. V-ZOOM. (5) Set the initial setting value of 14. V-ZOOM. (6) Adjust 14. V-ZOOM to make the vertical screen size to

92% of the picture size.

- NTSC V. HEIGHT -

(1) Receive a NTSC crosshatch signal. (2) Make similar adjustment of NTSC V. HEIGHT in the same

way as for “PAL V. HEIGHT”.

- PAL H. POSITION -

(1) Receive a PAL circle pattern signal. (2) Select 4. H-CENT. (3) Set the initial setting value of 4. H-CENT. (4) Adjust 4. H-CENT to make “C = D”.

- NTSC H. POSITION -

(1) Receive a NTSC circle pattern signal. (2) Make similar adjustment of NTSC H. POSITION in the

same way as for “PAL H. POSITION”.

V. LINEARITY adjustment

1-24 (No. YA106)

Signal generator

Remote control unit

[4. DEF]

12. V-S.CR

13. V-LIN

TOP

CENTRE

BOTTOM

- PAL V. LINEARITY -

(1) Receive a PAL crosshatch signal. (2) Select 12. V-S.CR. (3) Set the initial setting value of 12. V-S.CR.

(4) Select 13. V-LIN. (5) Set the initial setting value of 13. V-LIN.

(6) Adjust 12. V-S.CR and 13. V-LIN so that the spaces of

each line on TOP, CENTRE and BOTTOM become uniform.

- NTSC V. LINEARITY -

(1) Receive a NTSC crosshatch signal. (2) Make similar adjustment of NTSC V-S. CR in the same

way as for “PAL V-S. CR”.

Page 25

Item

Measuring

instrument

Test point Adjustment part Description

H. PARALLEL adjustment

H. BOW adjustment

Signal generator

Remote control unit

Signal generator

Remote control unit

Parallel

Straight

[4.DEF]

10. ANGLE

[4.DEF]

11. BOW

- PAL H. PARALLEL -

(1) Receive a PAL crosshatch signal. (2) Select 10. ANGLE. (3) Set the initial setting value of 10. ANGLE. (4) Adjust 10. ANGLE to optimize the trapezium distortion at

the centre of the screen.

- NTSC H. PARALLEL -

(1) Receive a NTSC crosshatch signal. (2) Make similar adjustment of NTSC H. PARALLEL in the

same way as for “PAL H. PARALLEL”.

- PAL H. BOW -

(1) Receive a PAL crosshatch signal. (2) Select 11. BOW. (3) Set the initial setting value of 11. BOW. (4) Adjust 11. BOW to optimize the horizontal arc distortion.

- NTSC H. BOW -

(1) Receive a NTSC crosshatch signal. (2) Make similar adjustment of NTSC H. BOW in the same

way as for “PAL H. BOW”.

(3) Press the [DISPLAY] key twice to return to the normal

screen.

VIDEO - 2 SET : COMPONENT

Item

H. POSITION adjustment

Measuring

instrument

Signal generator

Remote control unit

Test point Adjustment part Description

[4. DEF]

4. H-CENT

(1) Receive a PAL circle pattern signal to VIDEO-2 component

terminal.

(2) Select VIDEO-2 SET from the MENU and set VIDEO-2

SET to COMPONENT. (3) Select 4. DEF from the SERVICE MENU. (4) Select 4. H-CENT. (5) Set the initial setting value of 4. H-CENT. (6) Adjust 4. H-CENT to make “C=D”. (7) Press the [DISPLAY] key twice to return to the normal

screen.

(No. YA106) 1-25

Page 26

4.7.7 VSM PRESET SETTING

Item

VSM PRESET

Measuring

instrument

Remote control unit

setting

Test point Adjustment part Description

[5. VSM W/B]

1. BRIGHT

2. CONT

3. COLOUR

4. SHARP

5. HUE

1. R-DRIVE

2. G-DRIVE

3. B-DRIVE

(1) Select 5. VSM W/B from the SERVICE MENU. (2) Select BRIGHT with the MENU [OK] key. (3) Set the value of 1. BRIGHT ~ 5. HUE to the values shown in

the table.

(4) Respectively select the VSM PRESET mode for SOFT and

STANDARD. (5) Select COOL with the MENU [OK] key. (6) Set the values of 1. R-DRIVE ~ 3. B-DRIVE to the value

shown in the table. (7) Select the W/B preset for WARM and NORMAL, respectively. (8) Press the [DISPLAY] key twice to return to the normal

screen.

SUB MENU 5. VSM W/B

VSM PRESET BRIGHT

1. BRIGHT

***

[Setting Values for SUB 5. VSM W/B]

VSM preset

BRIGHT STANDARD SOFT

Setting item

1. BRIGHT 0+40

2. CONT +15 +5 +4

3. COLOUR 00+1

4. SHARP 000

5. HUE 0 0 -10

W/B preset

COOL WARM NOMAL

Setting item

1. R-DRIVE 0+80

2. G-DRIVE 0-40

3. B-DRIVE 0 -12 -10

1-26 (No. YA106)

Page 27

4.7.8 PURITY AND CONVERGENCE



PURITY ADJUSTMENT

Note:

The final adjustment of CONVERGENCE must be done after the FOCUS adjustment. (CONVERGENCE is affected by the FOCUS adjustment.) If CONVERGENCE is found deviated after the FOCUS adjustment, the PURITY adjustment should be checked and reset, if required.

(1) Demagnetize the CRT with the demagnetizer. (2) Loosen the retainer screw of the deflection yoke. (3) Remove the wedges. (4) Input a green raster signal from the signal generator, and

turn the screen to green raster. (5) Move the deflection yoke backward. (6) Bring the long lug of the purity magnets on the short lug and

position them horizontally. (Fig. 2) (7) Adjust the gap between two lugs so that the GREEN

RASTER will come into the centre of the screen. (Fig. 3) (8) Move the deflection yoke forward, and fix the position of the

deflection yoke so that the whole screen will become green. (9) Insert the wedge to the top side of the deflection yoke so that

it will not move. (10)Input a crosshatch signal. (11) Verify that the screen is horizontal. (12)Input red and blue raster signals, and make sure that the

purity is properly adjusted.

WEDGE

CRT

• P/C MAGNETS

P : PURITY MAGNET 4 : 4 POLES (convergence magnets) 6 : 6 POLES (convergence magnets)

DEFLECTION YOKE

4 6

P / C

MAGNETS

Fig. 1

Long lug

Short lug

(FRONT VIEW)

PURITY MAGNETS

Bring the long lug over the short lug and position them horizontally.

Fig. 2

GREEN RASTE

CENTRE

Fig. 3

(No. YA106) 1-27

Page 28



STATIC CONVERGENCE ADJUSTMENT

(1) Input a crosshatch signal. (2) Using 4-pole convergence magnets, overlap the red and

blue lines in the centre of the screen (Fig. 4) and turn them to magenta (red/blue).

(3) Using 6-pole convergence magnets, overlap the

magenta(red/blue) and green lines in the centre of the screen and turn them to white.

(4) Repeat (2) and (3) above, and make the best convergence.



DYNAMIC CONVERGENCE ADJUSTMENT

(1) Move the deflection yoke up and down and overlap the lines

in the periphery. (Fig. 5)

(2) Move the deflection yoke from the left to the right and overlap

the lines in the periphery. (Fig. 6) (3) Repeat (1) and (2) above, and make the best convergence. (4) Adjust XV by XV coil. (Fig.7)

NOTES:

• After the adjustment, fix the wedge at the original position.

• Fasten the retainer screw of the deflection yoke.

• Fix the P/C magnets with glue.

(FRONT VIEW)

RED

BLUE

RED

BLUE

GREEN

BLUE

RED

GREENGREEN

BLUE

RED

(FRONT VIEW)

GREEN GREEN

RED

(FRONT VIEW)

BLUE

RED

GREEN BLUE

BLUE

GREEN

RED

GREEN

1-28 (No. YA106)

Page 29

After about 5 seconds

Power on Port

Start of detection

Detection of an abnormality

SUB-POWER OFF

Flashing LED

SECTION 5

TROUBLESHOOTING

5.1

SELF CHECK FUNCTIONS

5.1.1

OUTLINE

This model has self check functions given below. When an abnormality has been detected, the SUB POWER is turned off and POWER LED flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer.

SELF CHECK ITEMS

5.1.2

Check item Details of detection Method of detection State of abnormality

B1 over-current protection

An over-current on the low B1 line is detected.

CRT neck broken protection

Operation of CRT neck protection circuit

5.1.3

SELF CHECK INDICATING FUNCTION

When an abnormality has been detected at about 5 seconds after the power was turned on, the SUB POWER is turned off immediately and the POWER LED flashes.

The main microcomputer detects the possible abnormality at 24-msec. intervals and judges the results in every 16 time. Of the 16 times, if NG is detected more than 9 times, it is judged that there is an abnormality.

When an abnormality has been detected, the SUBPOWER is turned off. While the SUB-POWER is being turned off, the POWER key on the remote control unit is not operational until the power cord is disconnected and connected again.

[ INDICATION BY THE POWER LED]

Item LED flashing intervals

B1 over-current protection / CRT neck broken portection

0.3 seconds

(No. YA106) 1-29

Page 30

Victor Company of Japan, Limited

AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan

(No. YA106)

Printed in Japan

WPC

JVC AV-21CS24, AV-21CX14 Service Manual

AV-21CS24 AV-21CX14

TABLE OF CONTENTS

SPECIFICATION

1. 1 SAFETY PRECAUTIONS

2. 1 FEATURES

2.3 FUNCTIONS

2.3 MAIN CPU [MAIN PWB : IC701] PIN FUNCTION

3.1 DISASSEMBLY PROCEDURE

3.2 REPLACEMENT OF MEMORY IC

3.3 REPLACEMENT OF CHIP COMPONENT

4. 1 ADJUSTMENT PREPARATION

4. 2 PRESETTING BEFORE ADJUSTMENT

4. 3 MEASURING INSTRUMENT AND FIXTURES

4.4 ADJUSTMENT ITEMS

4. 5 ADJUSTMENT LOCATIONS

4.6 BASIC OPERATION IN SERVICE MENU

4.7 ADJUSTMENT PROCEDURE

SELF CHECK FUNCTIONS