JVC AV-14AMG3/U Service Manual

SERVICE MANUAL

COLOR TELEVISION

AV-14AMG3

BASIC CHASSIS

SPECIFICATIONS ････････････････････････････････

SAFETY PRECAUTIONS ････････････････････････････････

FEATURES････････････････････････････････

FUNCTIONS ････････････････････････････････

SPECIFIC SERVICE INSTRUCTIONS ････････････････････････････････

SERVICE ADJUSTMENTS ････････････････････････････････

PARTS LIST ････････････････････････････････

★ OPERATING INSTRUCTIONS ★ STANDARD CIRCUIT DIAGRAM ････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････ 2

･･････････････････････････････････････････････････････････

･･･････････････････････ 3

･･････････････････････････････････････････････

･･････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････ 12

･･････････････････････････････････････････

････････････････････････････････････ 31

････････････････････････････････････････････････････････････････

･･･ 4

･･････

･･ 5

････

･････････････ 6

･･････････････････････････

････････････････ 2-1

････････････････････････････････

No. 52069 Aug. 2002

V-14AMG3

SPECIFICATIONS

ITEM

Dimensions(W×H×D) 364mm×333.5mm×374mm (

Mass (Net) 9.3kg

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

Color System

Picture Tube Visible size: 34cm (

High Voltage 22.5kV±1.5kV(at zero beam current)

Receiving

Intermediate Frequency

Color Sub Carrier Frequency

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

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

13”)

VHF (VL) 46.25MHz～168.25MHz

VHF (VH) 175.25MHz～463.25MHz

UHF 471.25MHz～863.25MHz

CATV

VIF Carrier 38.0MHz

SIF Carrier

Cable TVs of Mid (X-Z, S1-S10) Super (S11-S20) & Hyper (S21-S41) bands receivable

32.5MHz(5.5MHz)

33.5MHz (4.5MHz)

31.5MHz (6.5MHz)

32.0MHz (6.0MHz)

PAL (4.43MHz), SECAM (4.40625MHz / 4.25MHz) NTSC (3.58MHz / 4.43MHz)

14-3/8”×13-1/8”×14-3/4”)

measured diagonally

CONTENT

Power Input Rated Voltage AC110～240V, 50 / 60Hz

Power Consumption 68W (Max) / 47W(Avg)

, Round type×1

Speaker Φ8cm (

Audio Output 2W (monaural)

Aerial Input Terminal 75Ω Unbalanced

Input Video 1V(p-p), 75Ω RCA×2 (Front / Rear)

Audio

Output Video 1V(p-p), 75Ω

Audio

Headphone jack 3.5mm mini jack

Remote Control Unit

500mV(rms) (-4dBs), High impedance,

RCA×2 (Front / Rear)

500mV(rms) (-4dBs), Low impedance

RCA×1

RM-C360GY (Battery size : AA / R06 / UM-3×2)

3-1/16”)

Design and specifications are subject to change without notice.

No. 52069

SAFETY PRECAUTIONS

V-14AMG3

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 identic al 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 theref rom.

3. Many electric al 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 subst itute replacement which does not

have the s ame 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 differenc e 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 meas ure 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 incr ease 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 det ermine the caus e by visual inspection (incorrect installation, cr acked 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 manuf actur er 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 10kΩ 2W resistor to the anode button.

8. When servic e is required, observe the original lead dress. Extra precaution should be given to assure correct lead dress in the high voltage circuit area. W here a short circuit has occurred, those components that indicat e evidenc e of overheating should be replaced. Always us e the manufacturer's replacement components.

9. Isolation Check

(Safety for Electrical Shock Hazard)

After re-assembling the product, always perf orm an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal c abinet, screwheads, earphone jack, c ontrol shafts, etc.) to be sure the product is safe to operat e without danger of electr ical shoc k.

(1) Dielectr ic Strength Test

The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any expos ed metal part having a return path to the chass is 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 applianc e

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 s ervice trade.

(2) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer dur ing this check.). Using a "Leakage Current T ester", 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 c urrent must not exceed

0.5mA AC (r.m.s.). However, in tr opical 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 volt meter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor between an expos ed 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 resist or. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage meas ured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tr opical area, this must not exc eed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

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

0.15μF AC-TYPE

PLACE THIS PROBE

1500 Ω 10W

GOOD EARTH GROUND

ON EACH EXPOSED METAL PART

No.52069

V-14AMG3

FEATURES

" New chassis design enables use of an inter active on-screen control. " Wide range voltage (110V～240V) AC power input.

" With AUDIO / VIDEO INPUT & OUTPUT terminal. " MUTING button can reduce the audio level to zero instantly. " Functional remote control to operate TV set (for channel s elect, volume c ontrol, power ON/OFF, etc.) from a distanc e.

C bus control utilizes single chip ICs for IF, V/C, DEF. VSM PRESET, PRESET & SETUP TOUR.

" I " By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be r earranged automatic ally. " Built – in ON TIMER, RETURN + & CHILD LOCK.

SYSTEM BLOCK DIAGRAM

IC301

VIDEO/CHROMA

DECORDER

IC702

MEMORY

IC701

SCL1/SDA1

TU001

TUNER

SCL2/SDA2

MICRO

COMPUTER

No. 52069

FUNCTIONS

■ FRONT PANEL

1 2 3 4 5 678

MENU butt ons

(Replacement of IC301)

CHANNEL －/＋ buttons

VOLUME －/＋ buttons

(Replacement of IC301)

REMOTE CONTROL sensor

POWER / ON TIMER lamp

MAIN POWER button

A/V INPUT terminal

HEADPHONE jack

V-14AMG3

■ REAR TERMINAL

■

■ REMOTE CONTROL UNIT

ANT Terminal

VIDEO INPUT Terminal

AUDIO INPUT Terminal

AUDIO OUTPUT Terminal

VIDEO OUTPUT Terminal

SOUND SYSTEM key

COLOUR SYSTEM key

TV/VIDEO key

OFF TIMER key

CHANNEL SCAN key

RETURN＋key

DISPLAY key

CHANNEL－/＋ key

POWER key

PICTURE MODE key

Number (CH.) key

－/－－key

MUTING key

MENU key

MENU ▲/▼ key MENU －/＋ key

VOLUME－/＋ key

No. 52069

V-14AMG3

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

screws marked

2. As shown in figure, remove the

screw marked

3. Withdr aw the rear cover toward you.

[CAUTION] " When reinstalling the rear cover, carefully push it inward after

inserting the MAIN PW B into the rear cover groove.

and a screw marked

""""

####

REMOVING THE MAIN PW BOARD

" After removing the rear cover.

1. Slightly rais e the both sides of the MAIN PW BOARD by hand

and remove the PWB stopper marked

2. Withdr aw the MAIN PW BOARD backward. (If necessary, take off the wire clamp, connectors etc.)

from the front cabinet.

$$$$

!!!!

and a

REMOVING THE SPEAKER

" After removing the rear cover.

1. By holding up the SPEAKER HOLDER marked unlocking the claw, the SPEAKER HOLDER can be removed. Then you can remove the SPEAKER.

slightly and

%%%%

CHECKING THE MAIN PW BOARD

1. To check the back side of the PW Board.

1) Pull out the MAIN PW Board. (Refer to REMOVING THE MAIN PW Boar d)

2) Erect the PW Boar d vertically so that you can easily check the back side of the PW Board.

[CAUTION]

" When erecting the PW Board, be careful so that there will be no

contac ting with oth er PW Boar d.

" Before turning on power, make sure that the CRT earth wire and

other connector are properly connected.

WIRE CLAMPING AND CABLE TYING

1. Be sure t o clamp the wire.

2. Never remove the cable tie used for tying t he wires together. Should it be inadvertently removed, be sure to tie the wires with a new cable tie.

No. 52069

FRONT CABI.

CRT SOCKET

PWB

SPEAKER

V-14AMG3

SPEAKER

HOLDER

POWER

CORD

MAIN PWB

REAR

COVER

PWB

STOPPER

(××××1)

(××××4)

No. 52069

V-14AMG3

REPLACEMENT OF MEMORY ICs

1. MEMORY ICs

This model uses memory ICs. This memory IC data are for proper operation of the video and deflection circ uits. When replacing memory ICs, be sure to use ICs written with the initial values of data.

2. PROCEDURE FOR REPLACING MEMORY ICs

(1) Power off

Switch the power off and disconnect the power plug from the wall outlet.

(2) Replace ICs

Be sure to use memory ICs written with the initial data values.

(3) Power on

Connect the power plug into the wall outlet and switch the power on.

(4) Check and set SYSTEM CONSTANT SET

・・・・It must not adjust without adjustment signals.

1) Press the DISPLAY key and the PICTURE MODE key of the REMOTE

CONTROL UNIT simultaneously.

2) The SERVICE MENU screen of Fig. 1 will be displayed.

3) While the SERVICE MENU is displayed, again press the DISPLAY key and

PICTURE MODE key simultaneously, and the S YSTEM CONSTANT SET

screen of Fig. 2 will be displayed.

4) Check the setting values of the SYSTEM CONSTANT SET of Table 1 If the

value is different, select the setting item with the MENU ▼/▲key, and set the

correct value with the MENU - / + key.

5) Press the DI SPLAY key twice, and return to the normal screen.

(5) Receive channel of setting

Refer to the OPERATING INSTRUCTIONS and set the r eceive channels

(channels preset) as described

(6) User Setting

Check the user setting value of 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 items of the SERVICE MENU, and reset where necessar y.

For setting, refer to the SERVICE ADJUSTMENTS.

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.SETUP TOUR OFF

1-6 SELECT DISP : EXIT

******

***********

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

SYSTEM CONSTANT SET 1

: SELECT

- / + : OPERATE DISP : EXIT

SYSTEM CONSTANT SET 2

: SEL - / + : OPE DISP : EXIT

SERVICE MENU

***** **

**.****

** **

****

********

** ***

** ***** ***

**********

*** ** **

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

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

Fig.1

SYSTEM CONSTANT-ⅠⅠⅠⅠ

COLOUR : MULTI BILINGUAL : NO TUNER : MU ECO SENSOR : NO LANGUAGE : E/R/A/P

SYSTEM CONSTANT-ⅡⅡⅡⅡ

B/B SOUND : OFF LOCK : 180 COLOUR AUTO : NO QSS : MINT ALC : NO TEXT RATE : 20

SYSTEM CONSTANT-ⅢⅢⅢⅢ

PICTURE

MODE ke y

NUMBERS

SYSTEM CONSTANT SET 3

AMP TUNER : NO VNR : YES TEXT TABLE : CYL VOLUM PWM : POS

key

: SEL - / + : OPE DISP : EXIT

DISPLAY

key

▼/▲ key

Fig.2

－/＋key

No. 52069

SETTING OF SYSTEM CONSTANT SET

Setting item Setting contents Setting value

V-14AMG3

COLOUR

BILINGUAL

TUNER

ECO SENSOR

LANGUAGE

B/B SOUND

LOCK

COLOUR AUTO

QSS

ALC

TEXT RATE

AMP TUNER

VNR

TEXT TABLE

VOLUM PWM

MULTI.

YES NO

E/R/A/P

YES 10 20

YES NO

MINT MQSS

YES NO

10 20 40 80

YES NO

POS

E/R

OFF

CYL

NEG

PALTRIPLE

230 240 250

～

MULTI.

E / R / A / P

OFF

180

MINT

YES

CYL

POS

Table 1

USER SETTING VALUES

Setting item Setting value Setting item Setting value

SUB POWER ON LANGUAGE ENGLISH

CHANNEL POSITION 1 POSITION CHANNEL PRESET Refer to OPERATING INSTRUCTION

VOLUME About 10 SETUP TOUR ON

TV/VIDEO

ON SCREEN DISPLAY

COLOR SYSTEM PAL ON TIMER PR1 0:00

SOUND SYSTEM B / G BLUE BACK OFF

OFF TIMER OFF OSD.Shows 00 CHILD LOCK OFF

PICTURE MODE (VSM) BRIGHT

TV VNR OFF

POSITION INDICATION AUTO SHUTOFF OFF

Table 2

No. 52069

+ 21 hidden pages

JVC AV-14AMG3/U Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

FUNCTIONS

SPECIFIC SERVICE INSTRUCTIONS