JVC AV-29L31(-PH), AV-29L31B(-PH) Service Manual

Download

Page 1

SERVICE MANUAL

COLOR TELEVISION

AV-29L31 AV-29L31B

BASIC CHASSIS

POWER

DISPLAY

BASS

CHANNEL VOLUME

CLOSED

MUTING

CAPTION

TV/VIDEO

123

456

PICTURE MODE

7809

RETURN

100

CHANNEL SCAN

OFF TIMER

ECO SENSOR

RM-C249 REMOTE CONTROL UNIT

RM-C249-2C

[AV-29L31B(-PH)]

AV-29L31 AV-29L31B

POWER

DISPLAY

CHANNEL VOLUME

CLOSED

MUTING

CAPTION

TV/VIDEO

123

456

PICTURE MODE

7809

100

RETURN

CHANNEL SCAN

OFF TIMER

ECO SENSOR

RM-C248 REMOTE CONTROL UNIT

RM-C248-2C

[AV-29L31

(-PH)]

(-PH)

a SPECIFICATIONS ....................................................................................................................................2

a SAFETY PRECAUTIONS ........................................................................................................................3

a FEATURES ..............................................................................................................................................4

a FUNCTIONS .............................................................................................................................................5

a SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................6

¤ OPERATING INSTRUCTIONS (APPENDIX) ....................................................................................... 1-1

a SERVICE ADJUSTMENTS ....................................................................................................................16

¤ STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1

a PARTS LIST ...........................................................................................................................................35

No. 51906

Oct. 2001

Page 2

AV-29L31 AV-29L31B

SPECIFICATIONS

Items

Dimensions (W × H × D)

Mass 47kg 50kg

TV RF System CCIR(M)

Color System TV Mode NTSC3.58

VIDEO Mode NTSC3.58

Stereo System BTSC (Multi channel Sound)

Receiving Frequency VHF (VL) 54MHz – 88MHz (02 – 06)

VHF (VH) 174MHz – 216MHz (07 – 13)

UHF 470MHz – 806MHz (14 – 69)

CATV Low Band (02 – 06, A-8) by (02 – 06 & 01)

Intermediate VIF Carrier 45.75MHz

Frequency SIF Carrier 41.25MHz (4.5MHz)

Color Sub Carrier Frequency NTSC (3.58MHz)

Aerial Input Terminal 75Ø Unbalanced

Power Input AC110 – 240V, 50/60Hz

Power Consumption 172W

Picture Tube Visible size : 68cm measured diagonally

High Voltage 32kV + 1/–1.5kV (at cut-off in service mode)

Speaker 5cm × 12cm Oval type × 2 3.5cm + 10cm Round type × 2

Audio Output 7W + 7W 15W + 15W

Video / Audio Input (1 / 2 / 3) Video(1,3) : 1Vp-p, 75Ø (RCA pin jack)

73.2cm × 58.8cm × 51.8cm

High Band (07 – 13) by (07 – 13)

Mid Band (A – I) by (14 – 22)

Super Band (J – W) by (23 – 36) (54MHz – 804MHz)

Hyper Band (W+11 – W+23) by (47 – 59)

Ultra Band (W+29 – W+84) by (65 – 125)

Sub Mid Band (A8, A7 – A1) by (01, 93 – 99)

TV/CATV Total Channel 180 Channel

(Max.)

Audio(1,2,3) : 500mVrms ( -4dBs ), High Impedance (RCA pin jack)

Component Input ( Input 2 )

Y : 1Vp-p positive (negative sync provided, when terminated with 75Ø)

CB/CR : 0.7Vp-p 75Ø

AV-29L31-PH AV-29L31B-PH

/ 108W

(Avg.) 195W(Max.) / 120W(Avg.)

Contents

—

Video/Audio Output 1Vp-p, 75Ø (RCA pin jack)

500mVrms(-4dBs)

Low impedance (400Hz when modulated 100%) (RCA pin jack)

Headphone Jack Stereo mini jack (3.5φ)

Remote Control Unit RM-C248-2C RM-C249-2C

(Battery size: AA/R06/UM-3 × 2)

Design & specifications are subject to change without notice.

2 No. 51906

Page 3

SAFETY PRECAUTIONS

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

PLACE THIS PROBE ON EACH EXPOSED ME TAL PAR T

1500Ω 10W

0.15µF AC-TYPE

GOOD EARTH GROUND

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 (!) on the parts list in Service manual. 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 (NEU-

TRAL) 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 : ( ) side GND, the ISOLATED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don't short between the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure with a measuring apparatus (oscilloscope etc.) the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time. 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.

AV-29L31 AV-29L31B

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.

(1) 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.

(2) 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.).

● Alternate 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 1500Ø 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.).

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 10kØ 2W resistor to the anode button.

No. 51906 3

Page 4

AV-29L31 AV-29L31B

FEATURES

s New chassis design enables use of an interactive on-screen control. s Pure flat CRT produces fine textured picture in every detail. s Wide range voltage (110V ~ 240V) for AC power input. s With AUDIO/VIDEO/COMPONENT input terminals.

C bus control utilizes single chip ICs.

s I s By means of AUTO PROGRAM, the TV stations can be selected

automatically and the TV channels can also be rearranged automatically.

s Built-in DIGITAL ECO MODE (ECONOMY, ECOLOGY).

In accordance with the brightness in a room, the brightness and/or contrast of the picture can be adjusted automatically to make the optimum picture which is easy on the eye.

s Built-in OFF TIMER & RETURN +.

4 No. 51906

Page 5

FUNCTIONS

a FRONT PANEL

L/MONOVR

IN (VIDEO-3)

a REAR PANEL

COMPONENT

VIDEO-1

(

)

VIDEO-2

INPUT

AV-29L31 AV-29L31B

OUTPUT

MONO

a REMOTE CONTROL UNIT

[AV-29L31-PH]

DISPLAY

CLOSED

CAPTION

TV/VIDEO

PICTURE MODE

CHANNEL SCAN

ECO SENSOR

MONO

RRC

RM-C248-2C

CHANNEL VOLUME

123

456

7809

RETURN 100

POWER

MUTING

OFF TIMER

RM-C249-2C

[AV-29L31B-PH]

DISPLAY

BASS

CHANNEL VOLUME

CLOSED CAPTION

TV/VIDEO

PICTURE MODE

CHANNEL SCAN

RETURN 100

ECO SENSOR

POWER

123

456

7809

MUTING

OFF TIMER

RM-C248 REMOTE CONTROL UNIT

RM-C249 REMOTE CONTROL UNIT

No. 51906 5

Page 6

AV-29L31B

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE [AV-29L31-PH]

REMOVING THE REAR COVER

1. Unplug the AC power cord.

2. Remove the 16 screws marked

3. Withdraw the Rear cover toward you.

[CAUTION]

When reinstalling the rear cover, carefully push it inward after in-

•

serting the Main PWB into the rear cover groove.

as shown in Fig.1.

REMOVING THE CHASSIS (CHASSIS BASE AND CONTROL BASE)

After removing the rear cover.

•

1. Slightly raise the both sides of the chassis by hand and remove the 2 claws marked ı under the chassis from the front cabinet as shown in Fig.1.

2. Withdraw the chassis backward.

(If necessary, take off the wire clamp, connector’s etc.)

When conducting a check with power supplied, be sure to confirm

that the CRT earth wire is connected to the CRT SOCKET PWB and the Main PWB.

REMOVING THE AV TERMINAL BOARD

After removing the rear cover.

•

1. Remove the 4 screws marked Ç as shown in Fig.1.

2. When you pull out the AV Terminal board in the direction of arrow marked Î as shown in Fig.1, it can be removed.

CHECKING THE MAIN PW BOARD

1. To check the back side of the Main PWB.

1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).

2) Erect the chassis vertically so that you can easily check the back side of the Main PWB.

[CAUTION]

When erecting the chassis, be careful so that there will be no con-

•

tacting with other PW Board. 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.

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.

REMOVING THE CONTROL BASE

After removing the rear cover and the chassis.

•

1. While pushing down the 2 claws maked ´ as shown in Fig. 2.

2. When you pull out the Control base in the direction of arrow maked as shown in Fig. 2.

(If necessary, take off the wire, connector’s etc.)

REMOVING THE SPEAKER

After removing the rear cover.

•

1. Remove the 4 screws marked ˝ and 2 screws maked Ó as shown

in Fig.1.

2. Withdraw the speaker backward.

3. Follow the same steps when removing the other hand speaker.

6 No. 51906

Page 7

PICTURE TUBE

[FRONT SIDE]

CONTROL BASE

AV-29L31B

FRONT CABINET

SPEAKER

(×4)

FRONT CONTROL PWB (1/2)

CONTROL BASE

CRT SOCKET PWB

Fig.2

SPEAKER

CHASSIS BASE

Fig.2

(×4)

FRONT CONTROL PWB (2/2)

MAIN PWB

CLAW B

AV TERMINAL BOARD

REAR COVER

CHASSIS BASE

CLAW B

(×4)

(×16)

Fig.1

No. 51906 7

Page 8

AV-29L31B

DISASSEMBLY PROCEDURE [AV-29L31B-PH]

REMOVING THE REAR COVER

1. Unplug the AC power cord.

2. Remove the 16 screws marked Å as shown in Fig. 3.

3. Withdraw the Rear cover toward you.

[CAUTION]

When reinstalling the rear cover, carefully push it inward after in-

•

serting the Main PWB into the rear cover groove.

REMOVING THE CHASSIS (CHASSIS BASE AND CONTROL BASE)

After removing the rear cover.

•

1. Slightly raise the both sides of the chassis by hand and remove the

2 claws marked in Fig. 3.

2. Withdraw the chassis backward.

(If necessary, take off the wire clamp, connector’s etc.)

When conducting a check with power supplied, be sure to confirm

that the CRT earth wire is connected to the CRT SOCKET PWB and the Main PWB.

under the chassis from the front cabinet as shown

REMOVING THE AV TERMINAL BOARD

After removing the rear cover.

•

1. Remove the 4 screws marked Ç as shown in Fig. 3.

2. When you pull out the AV Terminal board in the direction of arrow

marked Î as shown in Fig. 3, it can be removed.

CHECKING THE MAIN PW BOARD

1. To check the back side of the Main PWB.

1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).

2) Erect the chassis vertically so that you can easily check the back side of the Main PWB.

[CAUTION]

When erecting the chassis, be careful so that there will be no con-

•

tacting with other PW Board. 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.

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.

REMOVING THE CONTROL BASE

After removing the rear cover and the chassis.

•

1. While pushing down the 2 claws maked ´ as shown in Fig. 4.

2. When you pull out the Control base in the direction of arrow maked as shown in Fig. 4.

(If necessary, take off the wire, connector’s etc.)

REMOVING THE DOME SPEAKER BOX

After removing the rear cover.

•

1. Remove the lower side screw marked “ ˝ ” first, and then the upper

side screw as shown in Fig. 3.

2. Follow the same step for removing the other hand speaker box.

8 No. 51906

Page 9

PICTURE TUBE

[FRONT SIDE]

CONTROL BASE

AV-29L31B

FRONT CABINET

FRONT CONTROL PWB (1/2)

CONTROL BASE

CRT SOCKET PWB

Fig. 3

CHASSIS BASE

Fig. 4

DOME SPEAKER BOX

(×2)

FRONT CONTROL PWB (2/2)

MAIN PWB

CLAW B

AV TERMINAL BOARD

REAR COVER

DOME SPEAKER BOX

(×2)

CHASSIS BASE

CLAW B

(×4)

(×16)

Fig. 3

No. 51906 9

Page 10

AV-29L31 AV-29L31B

REMOVING THE CRT

* Replacement of the CRT should be performed by 2 or more persons.

After removing the rear cover, chassis etc.,

•

1. Putting the CRT change table on soft cloth, the CRT change table

should also be covered with such soft cloth (shown in Fig. 5).

2. While keeping the surface of CRT down, mount the TV set on the

CRT change table balanced will as shown in Fig. 6.

3. Remove 4 screws marked by arrows with a box type screwdriver as

shown in Fig. 6. Since the cabinet will drop when screws have been removed, be

•

sure to support the cabinet with hands.

4. After 4 screws have been removed, put the cabinet slowly on cloth

(At this time, be carefully so as not to damage the front surface of the cabinet) shown in Fig. 7. The CRT should be assembled according to the opposite sequence

•

of its dismounting steps.

* The CRT change table should preferably be smaller that the CRT sur-

face, and its height be about 35cm.

CRT CHANGE TABLE

CLOTH

CRT CHANGE TABLE

Fig. 5

CRT

APPROX. 35cm

BOX TYPE SCREW DRIVER

COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.

Subsequent to replacement of the CRT and HV transformer or repair

•

of the anode cap, etc. by dismounting them, be sure to coat silicon grease for electrical insulation as shown in Fig. 8.

1. Wipe around the anode button with clean and dry cloth. (Fig. 8)

2. Coat silicon grease on the section around the anode button. At this

time, take care so that any silicon greases dose not sticks to the anode button. (Fig. 9)

夝 Silicon grease product No. KS - 650N

CRT

Anode button

CABINET

Approx. 20mm (Do not coat grease on this section

Fig. 6

CRT

CRT CHANGE TABLE

Fig. 7

Silicon grease should be coated by 5mm or more from the outside diameter of anode cap.

Silicon grease

coating

Fig. 8

10 No. 51906

Anode button (No sticking of silicon grease)

Coating position of silicon grease

Anode cap

Fig. 9

Page 11

REPLACEMENT OF MEMORY IC

AV-29L31 AV-29L31B

1. MEMORY IC

This TV uses the following memory IC.

Memory IC: IC1702 on MAIN PW Board

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”.

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 &/^ key, and set the correct value with the MENU –/+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 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 3.) If readjustment is necessary, perform adjustment referring to “SERVICE ADJUSTMENTS”.

SERVICE MENU

1. IF

3. DEF

5. PRESET

7. PLUG & PLAY (OFF)

1-7 : SELECT DISPLAY : EXIT

2. VC

4. VSM PRESET

6. AUDIO

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

Fig. 1

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 1

COLOR SYSTEM COMB TILT SUPER BASS

89 : SEL

+ : OPE DISP : EXIT

NTSC NO NO NO

NAME OF REMOTE CONTROL KEYS

DISPLAY

PICTURE MODE

CLOSED CAPTION

TV/VIDEO

PICTURE MODE

CHANNEL SCAN

ECO SENSOR

CHANNEL VOLUME

123

456

7809

RETURN

POWER

MUTING

100

OFF TIMER

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 2

MSP B / B SOUND TUNER COLOR AUTO

ΙΙ

YES NO NO MU

89 : SEL

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 3

LOCK LONG WAIT

89 : SEL

No. 51906 11

+ : OPE DISP : EXIT

SHORT WAIT

+ : OPE DISP : EXIT

Fig. 2

ΙΙΙ

: 001 : 001

Page 12

AV-29L31 AV-29L31B

SETTING OF SYSTEM CONSTANT SET

Setting item Setting content

COLOR SYSTEM

COMB

TILT

SUPER BASS

MSP

B/B SOUND

TUNER

COLOR AUTO

LOCK LONG WAIT

SHORT WAIT

NTSC TRIPLE

YES NO

MU MA

YES NO

000 255

Table 1

NTSC

YES

001

Setting value

AV-29L31B-PHAV-29L31-PH

PSEUDO

12 No. 51906

Page 13

USER SETTING VALUES

Setting item Setting value

SUB POWER ON

CHANNEL POSITION CH-02

CHANNEL PRESET REFER TO OPERATING INSTRUCTIONS

VOLUME 15 ± 2

TV/VIDEO TV

VNR OFF

COMPRESS (16:9) OFF

AUTO SHUTOFF OFF

CHILD LOCK OFF

BLUE BACK ON

VIDEO-2 SET VIDEO

LANGUAGE ENG

MONO SURROUND OFF

AI VOLUME ON

ON SCREEN DISPLAY POSITION INDICATION

COLOR SYSTEM NTSC

SOUND SYSTEM M

PICTURE MODE-VSM BRIGHT

OFF TIMER 00

ECO SENSOR OFF

PICTURE TILT 00

BASS CENTER

TREBLE CENTER

BALANCE CENTER

CLOSED CAPTION OFF (CC1/T1)

AV-29L31 AV-29L31B

Table 2

No. 51906 13

Page 14

AV-29L31 AV-29L31B

SERVICE MENU SETTING ITEMS

Service menu Setting item

1. IF 1. VCO

2. DELAY POINT

2. VC 1. CUTOFF(R/G)

2. DRIVE(R/G/B)

3. BRIGHT

4. PICTURE

5. COLOR

6. TINT

7. DETAIL

8. YDELAY

3. DEF 1. VER. SLOPE

2. VER. HEIGHT

3. VER. POSITION

4. VER. SCURVE

5. HOR. POSITION

6. HOR. WIDTH

7. EW-PIN

8. EW-TRAPEZ

9. UP CORNER

10. DW CORNER

11. HOR. PARALL

12. HOR. BOW

13. V. ZOOM

Do not adjust

Service menu Setting item

5. PRESET 1. CB

Do not adjust

6. AUDIO 1. STATUS

Do not adjust

PLUG & PLAY(OFF)

2. ACL

3. MUS

4. MAT

5. FCO

6. BPS

7. IFLH

8. VID

9. STM

10. AFCW

11. VSW

12. FFI

13. AGC

14. CL

15. AKB

16. HBL

17. BKS

18. READ STATUS

19. VNR

2. STANDARD SELECTION

3. FM PRESCALE

4. VSM PRESET 1. TINT

(BRIGHT/STD/SOFT) 2. COLOR

Do not adjust

3. BRIGHT

4. PICTURE

5. DETAIL

Table 3

14 No. 51906

Do not adjust

Page 15

REPLACEMENT OF CHIP COMPONENT

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.

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.

REPLACEMENT STEPS

1. How to remove Chip parts

Resistors, capacitors, etc.

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

nately melt the solder at each end.

AV-29L31 AV-29L31B

2. How to install Chip parts

Resistors, capacitors, etc.

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

(2) Shift with tweezers and remove 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 alter-

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

SOLDER

(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 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.

Note : After removing the part, remove remaining solder from the

pattern.

No. 51906 15

Page 16

AV-29L31 AV-29L31B

SERVICE ADJUSTMENTS

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 which set 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 adjustment-variable resistors, transformers, capacitors, etc.

7. 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

VNR OFF

BASS,TREBLE,BALANCE CENTER

TINT,COLOR,BRIGHT,PICTURE,DETAIL CENTER

MEASURING INSTRUMENT

1. DC voltmeter (or Digital voltmeter)

2. Oscilloscope

3. Signal generator (Pattern generator) [NTSC]

4. Remote control unit

ADJUSTMENT ITEMS

B1 POWER SUPPLY

•

FOCUS adjustment

•

IF circuit adjustment

•

VCO (CW) adjustment DELAY POINT adjustment

VC (VIDEO/CHROMA) circuit adjustment

•

WHITE BALANCE (Low light) adjustment WHITE BALANCE (High light) adjustment SUB BRIGHT adjustment SUB PICTURE adjustment SUB COLOR adjustment SUB TINT adjustment

DEFLECTION circuit adjustment

•

VER. SLOPE adjustment VER. POSITION adjustment V. ZOOM adjustment HOR. POSITION adjustment HOR. WIDTH adjustment EW-PIN adjustment EW-TRAPEZ adjustment VER. SCURVE adjustment UP CORNER and DW CORNER adjustment HOR. PARALL adjustment HOR. BOW adjustment

VSM PRESET adjustment

•

PRESET adjustment

•

AUDIO adjustment

•

PURITY and CONVERGENCE adjustments

•

PURITY adjustment STATIC CONVERGENCE adjustment DYNAMIC CONVERGENCE adjustment

16 No. 51906

Page 17

ADJUSTMENT LOCATIONS

AV-29L31 AV-29L31B

FRONT CONTROL PWB(1/2) FRONT CONTROL PWB(2/2)

POWER SW.

S901

FRONT

CN002

CN001

S804

S805

S806 S802

CN002

CN00A

S803S801

J304 J303 J302

MAIN PWB

DEG

CN001

IC702

IC701

J801

CN003

FRONT

S801 : CH UP + S802 : CH DOWN – S803 : MENU S804 : TV/VIDEO S805 : VOL UP+ S806 : VOL DOWN –

J804J801 J802 J803

AV IN/OUT

CRT SOCKET PWB

TP-47G

TU001

GND B1

TP-47B

HVT

UPPER : FOCUS (F1)

MIDDLE : FOCUS (F2)

LOWER : SCREEN

(SOLDER SIDE)

TOP

TP-E

CRT EARTH

(BRAIDED ASS'Y)

No. 51906 17

Page 18

AV-29L31 AV-29L31B

BASIC OPERATION IN SERVICE MENU

1. TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the remote control unit.

2. 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.VC .................................... For entering/adjusting the setting values (adjustment values)of the VIDEO/CHROMA circuit.

•

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

•

4.VSM PRESET ..................For setting the values of STANDARD,SOFT and BRIGHT.

•

5.PRESET ........................... For setting the values of the preset.

•

6.AUDIO .............................. For entering/adjusting the setting values (adjustment values) of the multiplicity sound circuit.

•

7.PLUG & PLAY (OFF) ....... This is not used for service.

•

3. BASIC OPERATION IN SERVICE MENU

(1) How to enter SERVICE MENU

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 7 on the remote control unit, and select the SUB MENU SCREEN from the SERVICE MENU.(See Fig.1 on the next page.)

(VSM:video status memory)

SERVICE MENU → SUB MENU 1. IF

2. VC

3. DEF

4. VSM PRESET

5. PRESET

6. AUDIO

7. PLUG & PLAY (OFF)

(3) Method of Setting

*Once the setting values are set,they are memorized automatically. *It must not adjust without inputting a signal.

1) 1. IF

[1.VCO ]

(a) 1 Key......................... Select 1.IF.

(b) 1 Key......................... Select 1.VCO.

Under normal conditions, no adjustment is required.

[2.DELAY POINT ]

(a) 1 Key......................... Select 1. IF.

(b) 2 Key......................... Select 2.DELAY POINT.

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

2) 2. VC, 3. DEF, 4. VSM PRESET, 5. PRESET and 6. AUDIO

(a) 2 ~ 6 Keys................. Select one from 2. VC, 3. DEF, 4. VSM PRESET, 5. PRESET and 6. AUDIO.

(b) MENU &/^ key ....... Select setting items.

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

•

Use the number keys on the remote control unit for setting of WHITE BALANCE.

•

For the setting, refer to each item concerned.

3) 7. PLUG & PLAY (OFF)

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.

18 No. 51906

Page 19

AV-29L31 AV-29L31B

SERVICE MENU

1. IF

3. DEF

5. PRESET

7. PLUG & PLAY (OFF)

1-7 : SELECT DISPLAY : EXIT

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

2. VC

4. VSM PRESET

6. AUDIO

SUB MENU 1. IF

1. VCO

2. DELAY POINT

1-2 : SELECT DISPLAY : EXIT

SUB MENU 2. VC

V/C

NTSC3.58

1. CUTOFF

60 Hz

MENU 89: SELECT

(R) (G)

/+ : OPERATE

** **

DISPLAY : EXIT

Setting item

1. CUTOFF (R/G)

2. DRIVE (R/G/B)

3. BRIGHT

4. PICTURE

5. COLOR

6. TINT

7. DETAIL

8. YDELAY

VCO (CW)

TOO HIGH ABOVE REFERENCE BELOW REFERENCE TOO LOW

DELAY POINT VHF

AGC TAKE-OVER

/+ : OPERATE

MHz

*****

DISPLAY : EXIT

SUB MENU 6. AUDIO

1. STATUS

2. STANDARD SELECTION

3. FM PRESCALE

MENU 89: SELECT MENU

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

STEREO SAP MONO

/+ : OPERATE

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

MHzAUDIO

*****

DISPLAY : EXIT

SUB MENU 3. DEF

4 : 3 / 16 : 9

4 : 3

NTSC3.58

DISPLAY : EXIT

1. VER. SLOPE

2. VER. HEIGHT

3. VER. POSITION

4. VER. SCURVE

5. HOR. POSITION

6. HOR. WIDTH

DEF

1. VER. SLOPE

60Hz

MENU 89: SELECT

/+ : OPERATE

Setting item

7. EW-PIN

8. EW-TRAPEZ

9. UP CORNER

10. DW CORNER

11. HOR. PARALL

12. HOR. BOW

13. V. ZOOM

SUB MENU 4. VSM PRESET

BRIGHT / STD / SOFT

BRIGHT

TINT COLOR BRIGHT PICTURE DETAIL

MENU 89: SELECT

/+ : OPERATE

** ** ** ** **

DISPLAY : EXIT

Setting item

1. TINT

2. COLOR

3. BRIGHT

PICTURE

5. DETAIL

SUB MENU 5. PRESET

Setting item

PRESET 60Hz

1. CB

MENU 89: SELECT

/+ : OPERATE

NTSC3.58

DISPLAY : EXIT

1. CB

2. ACL

3. MUS

4. MAT

5. FCO

6. BPS

7. IFLH

8. VID

9. STM

10. AFCW

11. VSW

12. FFI

13. AGC

14. CL

15. AKB

16. HBL

17. BKS

18. READ STATUS

19. VNR

Fig. 1

No. 51906 19

Page 20

AV-29L31 AV-29L31B

ADJUSTMENTS

B1 POWER SUPPLY

Item

Measuring

instrument

Test point Adjustment part Description

Check of B1 POWER

Signal Generator

SUPPLY

DC Voltmeter

FOCUS ADJUSTMENT

Item

Adjustment of FOCUS

Measuring instrument

Signal generator

B1 (pin 1) GND (pin 5) [CN00S 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 DC134.5 ± 2V.

Test point Adjustment part Description

FOCUS VR1,2 [In HVT]

Notes:

• Proceed to the following this adjustment after having completed the adjustments of B1 POWER SUPPLY, SUB BRIGHT and SUB CONT.

• Set PICTURE MODE (VSM) to “BRIGHT”.

• The final adjustment of CONVERGENCE must be done after the FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.) When makes difference by FOCUS adjustment, should be reconfirming PURITY adjustment.

1. Receive a cross-hatch signal.

2. While looking at the screen center, adjust the FOCUS VR2 (F2) so that the horizontal lines will be clear and in fine detail.

3. Adjust the FOCUS VR1 (F1) so that the vertical lines will be clear and in fine detail.

4. Make sure that the picture is in focus even when the screen gets darkened.

IF CIRCUIT ADJUSTMENT

Item

Adjustment of VCO (CW)

Adjustment of DELAY POINT

DELAY POINT (AGC TAKE-OVER)

Measuring instrument

Remote control unit

VCO (CW)

TOO HIGH ABOVE REFERENCE BELOW REFERENCE TOO LOW

Remote control unit

Setting

(Adjustment time)

Test point Adjustment part Description

. MHz

DISPLAY : EXIT

VCO (CW)

YELLOW

DELAY POINT (AGC TAKE-OVER)

Initial setting value

Note:

• Under normal conditions, no adjustment is required.

1. Select 1. IF from the SERVICE MENU.

2. Select 1. VCO by pressing the 1 key on the remote control unit.

3. Receive a broadcast signal.

4. Check the characters color of the BELOW REFERENCE displayed to yellow.

5. Press the DISPLAY key three times to return to normal screen.

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

2. Select 1. IF from the SERVICE MENU.

3. Select 2. DELAY POINT by pressing the 2 key on the remote con- trol unit.

4. Adjust the MENU –/+ key in order to eliminate any noise or beat from the image. Any increase above the initial value produces noise and any decrease below it produces 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.

20 No. 51906

Page 21

VC (VIDEO/CHROMA) CIRCUIT ADJUSTMENT

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”.

•

[SUB MENU 2. VC] : Do not adjust.

Setting (Adjustment)

item

Variable range NTSC3.58 COMPONENT

1 CUTOFF (R/G) –7 — +8 0

2 DRIVE (R/G/B) –30 — +31 0

BRIGHT

(COM./TV/V-1/V-2/V-3)

–30 — +31 –1/–16/0/0/0

4 PICTURE –30 — +31 0 —

5 COLOR –30 — +31 +10 +10

6 TINT (TV/VIDEO) –30 — +31 –15/0 —

7 DETAIL (TV/VIDEO) –30 — +31 –24/-10 —/0

8 YDELAY (TV/VIDEO) –8 — +7 0/+1 —

Initial setting value

AV-29L31 AV-29L31B

Item

Adjustment of WHITE BALANCE (Low light)

H.LINE OFF

H.LINE ON

R. CUTOFF (

Measuring

instrument

Test point Adjustment part Description

Signal generator

Remote control unit

MENU 89: SELECT

REMOTE CONTROL UNIT

12 3

)

1. CUTOFF

60 Hz

/+ : OPERATE

V/C

(R) (G)

1. CUTOFF (R) CUTOFF (G)

SCREEN VR [In HVT]

NTSC3.58

** **

DISPLAY : EXIT

G. CUTOFF (8)

Note:

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a NTSC black and white signal (color off).

2. Select 2. VC from the SERVICE MENU.

3. Select 1. CUTOFF (R) and (G) with MENU &/^ key, and set each value to initial setting value with the 4 and 7 keys, or 5 and 8 keys on the remote control unit.

4. Press the 1 key on the remote control unit to produce a single hori- zontal line.

5. Turn the SCREEN VR fully counterclockwise, then slowly turn it clockwise to where a red, blue or green color is faintly visible.

6. Use the keys 4 and 7 or 5 and 8 on the remote control unit and adjust the other 2 colors to where the single horizontal line appears white.

7. Turn the SCREEN VR to where the single horizontal line glows faintly.

8. Press the 2 key to return to 1. CUTOFF screen.

9. Press the DISPLAY key twice to return to the normal screen.

Setting (Adjustment) Variable Initial setting

Item range value

1. CUT OFF

R –7 — +8 0

G –7 — +8 0

R. CUTOFF (

789

)

G.CUTOFF (

)

No. 51906 21

Page 22

AV-29L31 AV-29L31B

Item

Adjustment of WHITE BALANCE (High light)

R. DRIVE (

Measuring instrument

Signal generator

Test point Adjustment part Description

2. DRIVE (R) DRIVE (G) DRIVE (B)

Remote control unit

NTSC3.58

V/C

1. DRIVE

60 Hz

MENU 89: SELECT

(R) (G) (B)

/+ : OPERATE

** ** **

DISPLAY : EXIT

REMOTE CONTROL UNIT

12 3

) B. DRIVE (8)

789

)

G. DRIVE (8)

B. DRIVE (

G.DRIVE (

Notes:

• Proceed to the following this adjustment after having completed the adjustment of LOW LIGHT WHITE BALANCE.

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a NTSC black and white signal (color off).

2. Select 2. VC from the SERVICE MENU.

3. Select 2. DRIVE (R), (G) and (B) with MENU &/^ key,and set each value to initial setting value with the 4 to 9 keys on the remote control unit.

4. Use the keys 4 to 9 to produce a white screen.

5. Press the DISPLAY key twice to return to the normal screen.

Setting (Adjustment) Variable Initial setting

Item range value

R –30 — +31 0

2. DRIVE G –30 — +31 0

B –30 — +31 0

)

Adjustment of SUB BRIGHT

Adjustment of SUB PICTURE

Remote control unit

3. BRIGHT

4. PICTURE

Notes:

• Proceed to the following this adjustment after having completed the adjustments of LOW LIGHT WHITE BALANCE and HIGH LIGHT WHITE BALANCE.

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a broadcast.

2. Select 2. VC from the SERVICE MENU.

3. Select 3. BRIGHT with the MENU &/^ key.

4. Set the initial setting value with the MENU –/+ key.

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 this adjustment after having completed the adjustment of SUB BRIGHT.

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a broadcast.

2. Select 2. VC from the SERVICE MENU.

3. Select 4. PICTURE with the MENU &/^ key.

4. Set the initial setting value with the MENU –/+ key.

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.

22 No. 51906

Page 23

AV-29L31 AV-29L31B

Item

Adjustment of SUB COLOR-I

Adjustment of SUB COLOR-II

Measuring

instrument

Remote control unit

Signal generator

Oscilloscope

Remote control unit

Test point Adjustment part Description

5. COLOR

[Method of adjustment without measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB PICTURE.

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a NTSC broadcast.

2. Select 2. VC from the SERVICE MENU.

3. Select 5. COLOR with the MENU &/^ key.

4. Set the initial setting value for NTSC3.58 COLOR with the MENU –

/+ key.

5. If the color is not best with the initial setting value, make fine adjust-

ment until you get the best color.

6. Press the DISPLAY key twice to return to the normal screen.

TP-47G TP-E (H) [CRT SOCKET PWB]

5. COLOR [Method of adjustment using measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB PICTURE.

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a NTSC color bar signal (full field color bar 75% white).

2. Select 2. VC from the SERVICE MENU.

3. Select 5. COLOR with the MENU &/^ key.

4. Set the initial setting value of NTSC3.58 COLOR with the MENU –

/+ key.

5. Connect the oscilloscope between TP-47G and TP-E.

Adjust NTSC3.58 COLOR to set the value (A) in the figure to

+2V (V

W-G

(A)

(–) 0V

(+)

No. 51906 23

Page 24

AV-29L31 AV-29L31B

Item

Adjustment of SUB TINT-I

Adjustment of SUB TINT-II

Measuring instrument

Remote control unit

Signal generator

Oscilloscope

Remote control unit

Test point Adjustment part Description

6. TINT [Method of adjustment without measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB PICTURE.

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a NTSC color bar signal (full field color bar 75% white).

2. Select 2. VC from the SERVICE MENU.

3. Select 6. TINT with the MENU &/^ key.

4. Set the initial setting value of NTSC 3.58 with the MENU –/+ key.

5. If you cannot get the best tint with the initial setting value, make fine adjustment until you get the best tint.

6. Press the DISPLAY key twice to return to the normal screen.

TP-47G TP-E (H) [CRT SOCKET PWB]

6. TINT [Method of adjustment using measuring instrument]

Notes:

• Proceed to the following this adjustment after having completed the adjustment of SUB PICTURE.

• Set PICTURE MODE (VSM) to “BRIGHT”.

1. Receive a NTSC color bar signal (full field color bar 75% white).

2. Select 2. VC from the SERVICE MENU.

3. Select 6. TINT with the MENU &/^ key.

4. Set the initial setting value of NTSC 3.58 with the MENU –/+ key.

5. Connect the oscilloscope between TP-47G and TP-E.

Adjust NTSC 3.58 TINT to set the value (B) in the figure to

7. Press the DISPLAY key twice to return to the normal screen.

0V (Vw-cy).

(B)

(–) 0V (+)

24 No. 51906

Page 25

AV-29L31 AV-29L31B

DEFLECTION CIRCUIT ADJUSTMENT

Note:

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

[SUB MENU 3. DEF]

Setting

(Adjustment)

Variable range

item

1. VER. SLOPE –31 — +31 0 ——

2. VER. HEIGHT –31 — +31 0 –24 —

3. VER. POSITION –31 — +31 0 ——

4. VER. SCURVE –31 — +31 0 ——

5. HOR. POSITION –31 — +31 +7 — +7

6. HOR. WIDTH –31 — +31 –1 ——

7. EW-PIN –31 — +31 –1 –12 —

8. EW-TRAPEZ –31 — +31 0 ——

9. UP CORNER –31 — +31 0 0 —

10. DW CORNER –31 — +31 0 0 —

11. HOR. PARALL –31 — +31 0 ——

12. HOR. BOW –31 — +31 0 ——

13. V.ZOOM –31 — +31 –1 +14 —

Initial setting value

COMPONENT4:3 COMPRESS(16:9)

Item

Adjustment of VER. SLOPE

Adjustment of VER.POSITION

Measuring

instrument

Signal generator

Remote control unit

Signal generator

Remote control unit

Test point Adjustment part Description

1. VER. SLOPE 1. Receive a NTSC circle pattern signal.

2. Select 3. DEF from the SERVICE MENU.

3. Select 1. VER. SLOPE with the MENU &/^ key.

4. Set the initial setting value of 1. VER. SLOPE with the MENU –/+ key.

5. Adjust 1. VER. SLOPE to make “A = B” with the MENU –/+ key.

Blanking line

3. VER. POSITION 6. Select 3. VER. POSITION with the MENU &/^ key.

7. Set the initial setting value of 3. VER. POSITION with the MENU –/+ key.

8. Adjust 3. VER. POSITION to make “A = B” with the MENU –/+ key.

(to be continued)

No. 51906 25

Page 26

AV-29L31 AV-29L31B

Item

Adjustment of V. ZOOM

Screen

size

91%

Adjustment of HOR. POSITION

Measuring instrument

Signal generator

Remote control unit

Signal generator

Remote control unit

Test point Adjustment part Description

2. VER. HEIGHT

13. V. ZOOM

9. Receive a NTSC cross-hatch signal.

10. Select 2. VER. HEIGHT with the MENU &/^ key.

11. Set the initial setting value of 2. VER. HEIGHT with the MENU –/+ key.

12. Select 13. V. ZOOM with the MENU &/^ key.

13. Set the initial setting value of 13. V. ZOOM with the MENU –/+ key.

Screen size

14. Adjust 13. V. ZOOM and make the vertical screen size 91% of the picture size with the MENU –/+ key.

Picture size 100%

5. HOR. POSITION 15. Receive a NTSC circle pattern signal.

16. Select 5. HOR. POSITION with the MENU &/^ key.

17.

Set the initial setting value of 5. HOR. POSITION with the MENU –/+ key.

18. Adjust 5. HOR POSITION to make “C=D” with the MENU –/+ key.

Adjustment of HOR. WIDTH

Screen

91%

size

Signal

6. HOR. WIDTH 19. Receive a NTSC cross-hatch signal.

generator

Remote control unit

Screen size 91%

Picture size 100%

20. Select 6. HOR. WIDTH with the MENU &/^ key.

21. Set the initial setting value of 6. HOR. WIDTH with the MENU –/+ key.

22. Adjust 6. HOR. WIDTH and make the horizontal screen size 91% of the picture size with the MENU –/+ key.

(to be continued)

Picture size 100%

26 No. 51906

Page 27

AV-29L31 AV-29L31B

Item

Adjustment of EW-PIN

Adjustment of EW-TRAPEZ

Measuring

instrument

Signal generator

Remote control unit

Signal generator

Remote control unit

Test point Adjustment part Description

7. EW-PIN 23. Select 7. EW-PIN with the MENU &/^ key.

24. Set the initial setting value of 7. EW-PIN with the MENU –/+ key.

25. Adjust 7. EW-PIN so that the first vertical lines at the left and right edges on the screen are straight.

Straight

8. EW-TRAPEZ 26. Select 8. EW-TRAPEZ with the MENU &/^ key.

27. Set the initial setting value of 8. EW-TRAPEZ with the MENU –/+ key.

28. Adjust 8. EW-TRAPEZ so that the vertical lines at the left and right edges on the screen are in parallel.

Adjustment of VER. SCURVE

Signal generator

Remote control unit

Parallel

4. VER. SCURVE 29. Select 4. VER. SCURVE with the MENU &/^ key.

30. Set the initial setting value of 4. VER. SCURVE with the MENU –/+ key.

31. Adjust 4. VER. SCURVE so that the spaces of each line on TOP, CENTER and BOTTOM become uniform.

TOP

CENTER

(to be continued)

BOTTOM

No. 51906 27

Page 28

AV-29L31 AV-29L31B

Item

Adjustment of UP CORNER and DW CORNER

Adjustment of HOR. PARALL

Measuring instrument

Signal generator

Remote control unit

Signal generator

Remote control unit

Test point Adjustment part Description

9. UP CORNER

10. DW CORNER

11. HOR. PARALL 37. Select 11. HOR. PARALL with the MENU &/^ key.

32. Select 9. UP CORNER with the MENU &/^ key.

33. Set the initial setting value of 9. UP CORNER with the MENU –/+ key.

34. Select 10. DW CORNER with the MENU &/^ key.

35. Set the initial setting value of 10. DW CORNER with the MENU –/+ key.

36. Adjust 9. UP CORNER and 10. DW CORNER so that the vertical lines at the four corners on the screen are straight.

38. Set the initial setting value of 11. HOR. PARALL with the MENU –/+ key.

39. Adjust 11. HOR. PARALL to optimize the parallelogram distortion.

Adjustment of HOR. BOW

Signal generator

Remote control unit

12. HOR. BOW 40. Select 12. HOR. BOW with the MENU &/^ key.

41. Set the initial setting value of Select 12. HOR. BOW with the MENU

–/+ key.

42. Adjust 12. HOR. BOW to optimize the horizontal arc distortion.

43. Press the DISPLAY key twice to return to the normal screen.

Straight

28 No. 51906

Page 29

[COMPRESS (16 : 9)]

Item

Measuring

instrument

AV-29L31 AV-29L31B

Test point Adjustment part Description

Adjustment of V. ZOOM and VER. HEIGHT

Screen

size

Adjustment of EW-PIN

Signal generator

Remote control unit

Signal generator

Remote control unit

Screen size

13. V. ZOOM

2. VER. HEIGHT

295 mm

7. EW-PIN

1. Receive a NTSC cross-hatch signal.

2. Select COMPRESS from the MENU and set COMPRESS to ON.

3. Select 3. DEF from the SERVICE MENU.

4. Set the initial setting value of 13. V. ZOOM with the MENU –/+ key.

5. Select 2. VER. HEIGHT with the MENU &/^ key.

6. Set the initial setting value of 2. VER. HEIGHT with the MENU –/+ key.

7. Adjust 2. VER. HEIGHT to set the vertical amplitude of the image to 295 mm.

8. Select 7. EW-PIN with the MENU &/^ key.

9. Set the initial setting value of 7. EW-PIN with the MENU –/+ key.

10. Adjust 7. EW-PIN so tha the first vertical lines at the left and right

edges on the screen are straight.

Adjustment of UP CORNER and DW CORNER

Signal generator

Remote control unit

Straight

9. UP CORNER

10. DW CORNER

11. Select 9. UP CORNER with the MENU &/^ key.

12. Set the initial setting value of 9. UP CORNER with the MENU –/+

key.

13. Select 10. DW CORNER with the MENU &/^ key.

14. Set the initial setting value of 10. DW CORNER with the MENU

–/+ key.

15. Adjust 9. UP CORNER and 10. DW CORNER so that the vertical

lines at the four corners on the screen are straight.

16. Press the DISPLAY key twice to return to the normal screen.

No. 51906 29

Page 30

AV-29L31 AV-29L31B

[COMPONENT]

Item

Measuring instrument

Test point Adjustment part Description

Adjustment of HOR. POSITION

Signal

5. HOR. POSITION 1. Receive a NTSC circle pattern signal to VIDEO-2 terminal.

generator

Remote control unit

2. Select VIDEO-2 SET from the MENU and set VIDEO-2 SET to COMPONENT.

3. Select 3. DEF from the SERVICE MENU.

4. Select 5. HOR. POSITION with the MENU &/^ key.

Set the initial setting value of 5. HOR. POSITION with the MENU –/+ key.

6 Adjust 5. HOR POSITION to make “C=D” with the MENU –/+ key.

7. Press the DISPLAY key twice to return to the normal screen.

VSM PRESET ADJUSTMENT

Item

Setting of VSM PRESET

Measuring instrument

Remote control unit

SUB MENU 4. VSM PRESET

TINT COLOR BRIGHT PICTURE DETAIL

MENU 89: SELECT

/+ : OPERATE

Test point Adjustment part Description

BRIGHT

DISPLAY : EXIT

** ** ** ** **

1. TINT

2. COLOR

3. BRIGHT

4. PICTURE

5. DETAIL

1. Select 4. VSM PRESET from the SERVICE MENU.

2. Select BRIGHT with the PICTURE MODE key.

3. Adjust the MENU &/^ key and MENU –/+ key to reset the set val- ues of 1. TINT – 5. DETAIL to the values shown in the table.

4. Respectively select the VSM PRESET mode for SOFT and STANDARD, and make similar adjustment as in 3 above.

5. Press the DISPLAY key twice to return to the normal screen.

[Setting Values for SUB MENU 4. VSM PRESET]

VSM preset VSM mode BRIGHT STANDARD SOFT Setting item

1. TINT

SETTING VALUE

2. COLOR

SETTING VALUE

3. BRIGHT

SETTING VALUE

4. PICTURE

SETTING VALUE

5. DETAIL

SETTING VALUE

15 11

15 0

30 No. 51906

Page 31

AV-29L31

Setting item Variable range Initial setting value (fixed)

1. STATUS

(Do not adjust.)

2. STANDARD SELECTION

3. FM PRESCALE STEREO

SAP

MONO

34H00H – FFH

00H – FFH

—

34H

AV-29L31B

PRESET ADJUSTMENT

Do not adjust 5. PRESET in the SERVICE MENU as it requires no adjustment.

•

[SUB MENU 5. PRESET]

Setting item Variable range Initial setting value

1 CB 0/1 0 2 ACL 0/1 0 3 MUS 0/1 0 4 MAT 0/1 0 5 FCO 0/1 0 6 BPS 0/1 0 7 IFLH 0/1 0 8 VID 0/1 0 9 STM 0/1 0 10 AFCW 0/1 0 11 VSW 0/1 0 12 FFI 0/1 0 13 AGC 00/10/01 10 14 CL 50 — 95 77 15 AKB 0/1 0 16 HBL 0/1 0 17 BKS 0/1 1 18 READ STATUS —— 19 VNR 00 — 63 25

AUDIO ADJUSTMENT

Do not adjust 6. AUDIO (1. STATUS, 2. STANDARD SELECTION, 3. FM PRESCALE) in the SERVICE MENU as it requires no adjustment.

•

[SUB MENU 6. AUDIO]

No. 51906 31

Page 32

AV-29L31 AV-29L31B

PURITY AND CONVERGENCE ADJUSTMENTS

Note: The final adjustment of CONVERGENCE must be done after the

FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.) When makes difference by FOCUS adjustment, should be reconfirming PURITY adjustment.

WEDGE

DEFLECTION YOKE

PURITY ADJUSTMENT

1. Demagnetize 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 center 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.

CRT

4 6

P / C

MAGNETS

• P/C MAGNETS

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

Fig. 1

PURITY MAGNETS

Long lug

11. Verify that the screen is horizontal.

12. Input red and blue raster signals, and make sure that purity is properly adjusted.

Short lug

(FRONT VIEW)

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

Fig. 2

GREEN RASTER

CENTER

Fig. 3

32 No. 51906

Page 33

STATIC CONVERGENCE ADJUSTMENT

1. Input a crosshatch signal.

AV-29L31 AV-29L31B

2. Using 4-pole convergence magnets, overlap the red and blue lines in the center 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 center of the screen and turn them to white.

4. Repeat 2 and 3 above, and make best convergence.

DYNAMIC CONVERGENCE ADJUSTMENT

1. Using the YH VR on the deflection yoke, match the YH (CROSS). (Fig. 5 and 8)

2. Using the YV VR on the deflection yoke, match the YV. (Fig. 6 and 8)

3. Repeat the steps 1 and 2, obtain an optimum convergence.

4. Differential coil ADJUSTMENT. In case where the horizontal lines of red and blue around the center of both sides of the picture as shown in Fig. 7, adjust the XV difference by using the differential coil on the top of the deflection yoke (Fig. 8) so as to minimize the XV difference.

(FRONT VIEW)

RED

BLUE

RED

BLUE

Fig. 4

GREEN

Fig. 5

BLUE

RED

GREENGREEN

BLUE

RED

After adjustment, fix the wedge at the original position.

•

Fasten the retainer screw of the deflection yoke. Fix the 6 magnets with glue.

YV VR YH VR

FRONT

coil

Fig. 8

(FRONT VIEW)

GREEN GREEN

RED

(FRONT VIEW)

BLUE

Fig. 6

BLUE

RED

GREEN

BLUE

GREEN

RED

GREEN

Fig. 7

No. 51906 33

Page 34

AV-29L31 AV-29L31B

SELF-CHECK FUNCTIONS

1. Outline

This model has self-check functions given below.When an abnormality has been detected,the SUB POWER is turned off and both ECO and ON TIMER LEDs flash to inform of the failure.An abnormality is detected by the signal input state of the control line connected to the microcomputer.

2. Self check items

Check item Details of detection Method of detection State of abnormality

Over-current protection

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

CRT NECK protection

Operation of CRT NECK protection circuit

3. Self check indicating function

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

The main microcomputer detects the possible abnormality at 30msec.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.

DITTO

After about 5 seconds

Powe r on

Start of detection

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

DITTO

Detection of an abnormality

Flashing LEDs

SUB-POWER OFF

[ Indication by the LEDs]

Item LEDs flashing intervals Priority of detection

1 Over-current protection At 0.2-second intervals 1

2 CRT NECK protection At 1-second intervals 2

Note: In case of 1 + 2, the item 1 is indicated.

34 No. 51906

Page 35

VICTOR COMPANY OF JAPAN, LIMITED

HOME AV NETWORK BUSINESS UNIT 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan

AV29L31PH-SK #4

AV29L31BPHSK #4

Printed in Japan VP0110 SW

JVC AV-29L31(-PH), AV-29L31B(-PH) Service Manual

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

FUNCTIONS

SPECIFIC SERVICE INSTRUCTIONS

SERVICE ADJUSTMENTS