JVC AV-20N13/PH, AV-20N33/PH, AV-21D13/PH, AV-21D33/PH Service Manual

SERVICE MANUAL

COLOR TELEVISION

AV-21D13
AV-21D33
AV-20N13
AV-20N33

BASIC CHASSIS

RM-C372GY
[AV-21D13/PH]
[AV-20N13/PH]

RM-C373GY
[AV-21D33/PH]
[AV-20N33/PH]

AV-21D13
AV-21D33

AV-20N13
AV-20N33

[AV-21D13/PH]
[AV-21D33/PH]

/PH

/PH

/PH

/PH

GA2

[AV-20N13/PH]
[AV-20N33/PH]

CONTENTS

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

!

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

!

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

!

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

!

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

!

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

!

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

!

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

!

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

1

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

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

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

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

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

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

･･･････････････････････････････････

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

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

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

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

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

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

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

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

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

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

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

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

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

COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.

･････････････････････････････ 2

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

･･･････････････････････ 3

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

･･･････････････････････ 4

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

･･････････････････････････････････

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

･････････････････････ 17

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

････････････････････････････････････ 35

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

･･･ 4

･･････

･･ 5

････

･････････････ 8

･･････････････････････････

････････････････ 2-1

････････････････････････････････

No.52022

Jul. 2002

Jul. 2002

A

V-21D13

A

A

A

V-21D33
V-20N13
V-20N33

SPECIFICATIONS

Items

Dimensions (W××××H××××D) 598mm×468mm×478mm 619mm×458mm×488mm

Mass 21.0kg 19.0kg

TV RF System CCIR (M)&(N)

Color / Sound System NTSC / PAL-M / PAL-N

TV Receiving Channels
and Frequency

CATV Receiving Channels
and Frequency

TV/CATV Total Channel 181 Channels

Intermediate Frequency Video IF Carrier

VL Band

VH Band

UHF Band

Low Band

High Band

Mid Band

Super Band

Hyper Band

Ultra Band

Sub Mid Band

Sound IF Carrier

AV-21D13

BTSC (Multi Channel Sound) [AV-21D33

(02～06) 54MHz～88MHz
(07～13) 174MHz～216MHz
(14～69) 470MHz～806MHz

(02～06)
(07～13)
(14～22)
(23～36)
(37～64)
(65～94, 100～125)
(01, 96～99)

45.75MHz

41.25MHz (4.5MHz)

/PH / AV-21D33/PH AV-20N13/PH / AV-20N33/PH

(54MHz～804MHz)

Contents

NTSC / PAL-M / PAL-N
BTSC (Multi Channel Sound) [AV-20N33

/PH]

/PH]

Color Sub Carrier NTSC : 3.579545MHz

PAL-M : 3.57561149MHz

PAL-N : 3.58205625MHz

Antenna terminal

Rated VoltagePower Input

Oper ating Voltage

Power Consumption 66W 60W

Picture Tube Vis ible size 51cm measured diagonally Vis ible size 48cm measured diagonally

High Voltage

Speaker

Audio Power Output

Input Video input

Audio input

Output

Headphone Jack Ster eo mini Jack (φ3.5mm)

Video output

Audio output

75Ω(VHF/UHF) Terminal,
F-Type Connector

110V～240V AC, 50Hz/60Hz
90V～260V AC, 50Hz/60Hz

26.5kV±1.0kV (at zero beam current)

5cm×12cm Oval type×2

2W (monaural) [AV-21D13

1.5W+1.5W (stereo) [AV-21D33

1V(p-p) 75Ω (RCA pin jack)

500mVrms (-4dBs) / High impedance
(RCA pin jack)

1V(p-p) 75Ω (RCA pin jack)

500mVrms (-4dBs) / Low impedance
(RCA pin jack)

/PH

]

/PH

]

/PH

2W (monaural) [AV-20N13

1.5W+1.5W (stereo) [AV-20N33

]

/PH

]

Remote Control Unit RM-C372GY [AV-21D13

RM-C373GY [AV-21D33
(AA/R6/UM-3 battery×2)

/PH

/PH

]

]

RM-C372GY [AV-20N13

RM-C373GY [AV-20N33
(AA/R6/UM-3 battery×2)

/PH

/PH

]

]

Design & specifications are subject to change without notice.

2

No.52022

A

A

A

A

SAFETY PRECAUTIONS

V-21D13
V-21D33
V-20N13
V-20N33

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.52022

3

A

V-21D13

A

A

A

V-21D33
V-20N13
V-20N33

FEATURES

" New chas sis design enables use of a main board with simplified

circuitry.

" Provided with miniatur e tuner (TV/CATV).
" PLL synthesizer system TV/CATV totaling 181 channels.
" Multifunctional remote control permits picture adjustment.
" With NTSC/PAL-M&PAL-N color/sound systems.

" Adoption of the VIDEO STATUS func tion.
" With 75ΩV/U in common (F-Type) ANT Terminal.
" Wide range rated voltage (110V～240V) AC power input.

" Clos ed-caption broadcasts can be viewed.

MAIN DIFFERENCE LIST

Model Name

!

Part Name(Item)

MAIN PW B SGA-1062A SGA-1061A SGA-1064A SGA-1063A

REMOTE CONTROL UNIT RM-C372GY-1H RM-C373GY-1H RM-C372GY-1H RM-C373GY-1H

!

FRONT CABINET LC11129-019A-H LC11129-020A-H LC10438-030A-H LC10438-031A-H

!

REAR COVER GG10130-007A-H LC10448-003A-HK

!

PICTURE TUBE A51LEC065X A48KXR064X

TERMINAL SHEET GG30058-002A-H GG30058-001A-H GG30058-002A-H GG30058-001A-H

AV-21D13

/PH

AV-20D33

/PH

AV-20N13

/PH

AV-20N33

/PH

SPEAKER CEBSS12D-07KJ2 CEBSS12D-04KJ2 CEBSS12D-07KJ2 CEBSS12D-04KJ2

PACKING CASE GG10056-076A-H GG10056-078A-H GG10056-074A-H GG10056-075A-H

NTSC / PAL-M / PAL-N

Color / Sound System NTSC / PAL-M / PAL-N

Power Consumption 66W

Speaker

Audio Power Output 2W (monaural) 1.5W+1.5W (stereo) 2W (monaural) 1.5W+1.5W (stereo)

5× 12cm Oval type×2

(monaural)

BTSC(Multi Channel

Sound)

5× 12cm Oval type×2

(stereo)

NTSC / PAL-M / PAL-N

60W

5× 12cm Oval type×2

(monaural)

NTSC / PAL-M / PAL-N

BTSC(Multi Channel

Sound)

5× 12cm Oval type×2

(stereo)

4

No.52022

A

A

A

A

FUNCTIONS

■ FRONT PANEL

V-21D13
V-21D33
V-20N13
V-20N33

910

[AV-21D33/PH]

■ REAR TERMINAL

2

[AV-21D13/PH]

10 9 1 2 3 4 5 6 7 8

2

1

4

3

1

MENU butt ons

CHANNEL －/＋ buttons

2

VOLUME －/＋ buttons

3

AI ECO sensor

4

REMOTE CONTROL sensor

5

ON TIMER lamp

6

POWER lamp

7

MAIN POWER button

8

A/V INPUT terminal

9

HEADPHONE jack

10

5

1

6

3

[AV-21D13/PH]

1

ANT Terminal

2

VIDEO INPUT Terminal

3

AUDIO INPUT Terminal

4

VIDEO OUTPUT Terminal

5

AUDIO OUTPUT Terminal

5

4

[AV-21D33/PH]

ANT Terminal

1

VIDEO INPUT Terminal

2

AUDIO L/MONO INPUT Terminal

3

AUDIO R IN PUT Terminal

4

VIDEO OUTPUT Terminal

5

AUDIO L OUTPUT Terminal

6

AUDIO R OUTPUT Terminal

7

7

No. 52022

5

A

V-21D13

A

A

A

V-21D33
V-20N13
V-20N33

■ FRONT PANEL

9

10

[AV-20N33/PH]

10 9

■ REAR TERMINAL

2

[AV-20N13/PH]

1

3 4

2

5

7

6

1

4

8

2

3

1

MENU butt ons

CHANNEL －/＋ buttons

2

VOLUME －/＋ buttons

3

4

AI ECO sensor

5

REMOTE CONTROL sensor

6

ON TIMER lamp

7

POWER lamp

8

MAIN POWER button

9

A/V INPUT terminal

10

HEADPHONE jack

5

1

6

3

[AV-20N13/PH]

1

ANT Terminal

VIDEO INPUT Terminal

2

AUDIO INPUT Terminal

3

4

VIDEO OUTPUT Terminal

AUDIO OUTPUT Terminal

5

5

4

[AV-20N33/PH]

1

ANT Terminal

VIDEO INPUT Terminal

2

AUDIO L/MONO INPUT Terminal

3

AUDIO R IN PUT Terminal

4

VIDEO OUTPUT Terminal

5

AUDIO L OUTPUT Terminal

6

AUDIO R OUTPUT Terminal

7

7

6

No. 52022

A

V-21D13

A

A

A

V-21D33
V-20N13
V-20N33

■ REMOTE CONTROL UNIT

1

2

3

4

5

6

7

8

9

10

This illustration is written about RM-C373GY(AV-21D33/PH
& AV-20N33/PH),There are no key of HYPER SURROUND in
the RM-C372GY(AV-21D13/PH & AV-20N 13/PH).

11

12

13

14

15

16

17

TV/VIDEO key

1

DISPLAY key

2

PICTURE BOOSTER key

3

CLOSED CAPTION key

4

SLEEP TIMER key

5

VIDEO STATUS key

6

COLOUR SYSTEM key

7

100＋key

8

EXIT key

9

CHANNEL－/＋ key

10

POWER key

11

Number (CH.) keys

12

RETURN＋key

13

HYPER SURROUND key

14

[AV-21D33

MENU key

15

MENU ▲/▼ key
MENU －/＋ key

MUTING key

16

17

VOLUME－/＋ key

/PH &

AV-20N33

/PH

Only]

No. 52022

7

A

V-21D13

A

A

A

V-21D33
V-20N13
V-20N33

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

screws marked

2. As shown in figure, remove the
2 screws marked

3. Withdr aw the rear cover toward you.

""""

.

7

REMOVING THE PW BOARD

" After removing the rear cover.

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

2. Withdr aw the 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. Follow the same steps when r emoving the other hand speak er.

2

####

!!!!

.

and the

CHECKING THE PW BOARD

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

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

2) Erect the PW Board vertically so that you c an 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. 52022

A

A

A

A

FRONT CABI.

A

A

SPEAKER

CRT SOCKET

PWB

PW BOARD

V-21D13
V-21D33
V-20N13
V-20N33

This exploded view describes

/PH

about AV-21D13

Although AV-21D33

different from this figure, you

can use the exploded view for

disassembling the AV-21D33

in the same step as for the AV-

/PH.

21D13

C

（×

（×2））））

（×（×

.

/PH

is slightly

/PH

SPEAKER

POWER

CORD

（×

（×2））））

（×（×

C

V-21D13/PH

V-21D33/PH

REAR

COVER

A

（×

（×7））））

（×（×

No. 52022

B

（×

（×2））））

（×（×

9

A

V-21D13

A

A

A

V-21D33
V-20N13
V-20N33

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

screws marked

2. As shown in figure, remove the

screws marked

2

3. Withdraw the rear cover toward you.

""""

.

6

REMOVING THE PW BOARD

" After removing the rear cover.

1. Slightly raise the both sides of the PW Board by hand.

2. Withdr aw the 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. Follow the same steps when r emoving the other hand speak er.

2

CHECKING THE PW BOARD

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

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

2) Erect the PW Board vertically so that you c an 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.

####

!!!!

.

and the

WIRE CLAMPING AND CABLE TYING

1. Be sure to clamp the wire.

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

10

No. 52022

A

A

A

A

FRONT CABI.

SPEAKER

V-21D13
V-21D33
V-20N13
V-20N33

This exploded view describes

/PH

about AV-20N13

Although AV-20N33

different from this figure, you

can use the exploded view for

disassembling the AV-20N33

in the same step as for the AV-

PH.

20N13/

.

/PH is slightly

/PH

SPEAKER

REAR

COVER

C

(××××2)

POWER

CORD

CRT SOCKET

PWB

PW BOARD

C

(××××2)

-

-

B

(××××2)

A

(××××6)

No. 52022

11