JVC AV-2115EE, AV-21Q3/AU, AV-21Q3/D, AV-21Q3/HK, AV-21Q3MG3 Service Manual

SERVICE MANUAL

COLOUR TELEVISION

AV-21Q3

AV-21QMG3

AV-2115EE

AV-21Q3/D / AV-21Q3

AV-21Q3

/HK

AV-21QMG3

AV-2115EE

/AU

/ AV-21QMG3

/ AV-21QMG3

/-A

BASIC CHASSIS

CG

/U

CONTENTS

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

!

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

!

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

!

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

!

MAIN DIFFERENCE LIST ････････････････････････････････

!

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

!

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

!

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

!

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

1

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

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

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

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

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

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

･･･････････････････････････････････

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

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

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

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

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

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

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

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

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

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

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

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

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

COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.

･････････････････････････････ 2

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

･･･････････････････････ 3

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

･･････････････････････････････････

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

･･･････････････････････ 7

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

･････････････････････ 14

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

････････････････････････････････････ 33

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

･･･ 4

･･････

･･ 5

････

･････････････ 8

･･････････････････････････

････････････････ 2-1

････････････････････････････････

No. 52027
Aug. 2002

A

V-21Q3

A

A

V-21QMG3
V-2115EE

SPECIFICATIONS

CONTENTS

ITEM

Dimensions(W×H×D) 497mm×454mm×480mm

Mass(Net) 19kg

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

AV-21Q3/D / AV-21Q3/AU

AV-21Q3

/HK

/ AV-2115EE

AV-21QMG3

AV-21GMG3

/-A /

AV-21QMG3

/U

Colour System

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

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

Picture Tube Visible size: 51cm measured diagonally

High Voltage 26.5kV±1.5kV(at zero beam current)

Receiving Frequency VHF (VL) 46.25MHz～140.25MHz

VHF (VH) 143.25MHz～423.25MHz

UHF 439.25MHz～865.25MHz

Cable TVs of Mid (X-Z, S1-S10)

CATV

Super (S11-S20) & Hyper (S21-S41)
bands receivable

VIF Carrier 38.0MHz

Intermediate
Frequency

SIF Carrier

32.5MHz (5.5MHz)

31.5MHz (6.5MHz)

32.0MHz

(6.0MHz)

PAL (4.43MHz),

Colour Sub Carrier Frequency

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

/ AV-2115EE ]

/D

/ AV-21Q3

/AU

/HK

]

Power Input Rated Voltage

[AV-21Q3
: AC110～240V, 50 / 60Hz
[AV-21Q3
: AC220～240V, 50 / 60Hz

Power Consumption 90W (Max) / 60W(Avg)

32.5MHz(5.5MHz) /33.5MHz (4.5MHz)

31.5MHz (6.5MHz)

32.0MHz

(6.0MHz)

AC110～240V, 50 / 60Hz

Speaker 5cm×9 cm, Oval type×1

Audio Output 3W (monaural)

Aerial Input Terminal 75Ω Unbalanced

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

Audio

500mV(rms) (-4dBs), High impedance,
RCA×2 (Front / Rear)

Output Video 1V(p-p), 75Ω

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

Headphone jack 3.5mm mini jack

Remote Control Unit

RM-C364GY
(Battery size : AA / R06 / UM-3×2)

Design and specifications are subject to change without notice.

2

No. 52027

A

A

A

SAFETY PRECAUTIONS

V-21Q3

V-21QMG3

V-2115EE

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 service is requir ed, obser ve 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.52027

3

A

V-21Q3

A

A

V-21QMG3
V-2115EE

FEATURES

" New chassis design enables use of an inter active on-screen control.

/AU

" Wide range voltage (110V～240V) AC power input.(Except for AV-21Q3

" 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.

2

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 AI ECO (ECONOMY, ECOLOGY) sensor

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

" Built-in ON TIMER, RETURN + & CHILD LOCK.

and AV-21Q3

SYSTEM BLOCK DIAGRAM

/HK

)

IC702

MEMORY

SCL2/SDA2

IC701

MICRO

COMPUTER

IC301

VIDEO/CHROMA

DECORDER

SCL1/SDA1

TU001

TUNER

4

No. 52027

A

A

A

FUNCTIONS

■ FRONT PANEL

MENU butt ons

1

(Replacement of IC301)

CHANNEL －/＋ buttons

2

VOLUME －/＋ buttons

3

(Replacement of IC301)

AI ECO sensor

4

REMOTE CONTROL sensor

5

ON TIMER lamp

6

POWER lamp

7

MAIN POWER button

8

V-21Q3

V-21QMG3

V-2115EE

10 9 1 2 3 4 5 6 7 8

■ REAR TERMINAL

1

A/V INPUT terminal

9

HEADPHONE jack

10

ANT Terminal

1

2

3

4

5

VIDEO INPUT Terminal

2

AUDIO INPUT Terminal

3

4

AUDIO OUTPUT Terminal

VIDEO OUTPUT Terminal

5

No. 52027

5

A

V-21Q3

A

A

V-21QMG3
V-2115EE

■ REMOTE CONTROL UNIT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ECO SENSOR key

1

SOUND SYSTEM key

2

COLOUR SYSTEM key

3

TV/VIDEO key

4

OFF TIMER key

5

CHANNEL SCAN key

6

RETURN＋key

7

DISPLAY key

8

CHANNEL －/＋ key

9

POWER key

10

PICTURE MODE key

11

Number (CH.) key

12

－/－－key

13

MUTING key

14

MENU key

15

MENU ▲/▼ key
MENU －/＋ key

VOLUME－/＋ key

16

6

No. 52027

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A

A

MAIN DIFFERENCE LIST

V-21Q3

V-21QMG3

V-2115EE

Model Name

AV-21Q3

AV-21Q3

AV-21Q3

AV-21QMG3 SCG-1443A

AV-21QMG3

AV-21QMG3

AV-2115EE SCG-1442A GG10196-001B-H

Model Name

AV-21Q3

AV-21Q3

AV-21Q3

AV-21QMG3 LCT1196-001A-H

AV-21QMG3

AV-21QMG3

Part Name

/D

/AU

/HK

/-A

/U

Part Name

/D

/AU

/HK

/-A

/u

Main PWB Front Cabinet JVC Mark Power Cord

SCG-1424A GG10196-001B-H CM43094-009-H QMPR340-165-K2

SCG-1441A

CM48125-009 QMPG090-165-K2

GG40023-001A-H QMPR370-165-E2

GG10196-002A-H QMPR340-165-K2

QMPR380-165-K2

SCG-1431A QMPR340-165-K2

Inst Book Digest Manual Warranty Card Conversion Plug

LCT1188-001A-H LCT1190-001A-H

BT-56001-2

LCT1208-001A-H

LCT1197-001A-H

AV-2115EE LCT1195-001BH BT-56001-2

QAM0055-001

/D

/AU

/HK

Item

TV RF System

B/G, I, D/K PAL / SECAM

Model Name

AV-21Q3

AV-21Q3

AV-21Q3

AV-21QMG3 B/G, I, D/K,M

AV-21QMG3

AV-21QMG3

/-A

/U

AV-2115EE B/G, I, D/K

Colour System

[RF Mode]

PAL / SECAM

NTSC3.58 / NTSC4.43

PAL / SECAM

Power Input OSD Language

AC110～240V,

50 / 60Hz

E / C / M / I

AC220～240V,

50 / 60Hz

E / C

AC110～240V,

50 / 60Hz

E / R / A / P

E / R / U

No. 52027

7

A

V-21Q3

A

A

V-21QMG3
V-2115EE

SPECIFIC SERVICE INSTRUCTIONS

REMOVING THE REAR COVER

1. Unplug the power plug.

screws marked

2. As shown in figure, remove the

screw marked

3. Remove the back board and remove the power c ord from the
rear cover.

4. Withdr aw the rear cover toward you.

and a scr ew marked

""""

5

.

####

REMOVING THE MAIN PW BOARD

" After removing the rear cover.

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

from the cabinet

and remove the PWB stopper marked
bottom.

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

$$$$

REMOVING THE SPEAKER

" After removing the rear cover.

screws marked

1. As shown in figure, remove the

2

%%%%

!!!!

.

and a

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.

8

No. 52027

A

A

A

FRONT CABI.

V-21Q3

V-21QMG3

V-2115EE

CRT SOCKET

PWB

MAIN PWB

REAR

COVER

SPEAKER

(××××2)

E

D

PWB STOPPER

(××××1)

C

(××××1)

B

POWER

CORD

A

(××××5)

No. 52027

9

A

V-21Q3

A

A

V-21QMG3
V-2115EE

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 S YSTEM CONSTANT SET of T able 1 If the

value is different, s elect 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 :
BILINGUAL : NO
TUNER : MU
ECO SENSOR : YES
LANGUAGE :

/

***

***

SYSTEM CONSTANT-ⅡⅡⅡⅡ

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

/

***

***

SYSTEM CONSTANT-ⅢⅢⅢⅢ

DISPLAY key

MENU

-/+ key

PICTURE

MODE ke y

MENU

▼/▲ key

SYSTEM CONSTANT SET 3

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

: SEL - / + : OPE DISP : EXIT

/

Fig.2

(RM-C364GY)

10

No. 52027