JVC AV-32220/G, AV-32220/H, AV-32220/M Service Manual

A

SERVICE MANUAL

COLOR TELEVISION

AV-32220

/G

V-32220

BASIC CHASSIS

GF3

AV-32220
AV-32220

/H

/M

CONTENTS

!

SPECIFICATIONS

!

SAFETY PRECAUTIONS

!

FEATURES

!

MAIN DIFFERENCE LIST

!

HOW TO IDENTIFY MODELS

!

FUNCTIONS

!

SPECIFIC SERVICE INSTRUCTIONS

!

SERVICE ADJUSTM ENTS

!

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

1

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

････････････････････････････････ ････

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

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

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

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

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

･････････････････

･･････････････････････････････････

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････････････････････････････････ ････

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

･･････････････････

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･･･････

･･････････････

･･････

････････････

････

････････

2-1

2
3
4
4
4
5

6
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31

No.51782

Jan. 2001

Jan. 2001

A

V-32220

SPECIFICATIONS

Items Contents

Dimensions (W
Mass
TV System and Color system

TV RF System
Color System
Sound System

TV Receiving Channels and Frequency

VL Band
VH Band
UHF Band

CATV Receiving Channels and Frequency

Low Band
High Band
Mid Band
Super Band
Hyper Band
Ultra Band
Sub Mid Band

TV/CATV Total Channel
Intermediate Frequency

Video IF Carrier
Sound IF Carrier

Color Sub Carrier
Power Input
Power Consumption
Picture Tube
High Voltage
Speaker
Audio Power Output
INPUT

S-Video

Video
Audio

Audio Output
(Variable / Fix : Selectable)

AV Compu link EX Input
Antenna terminal
Remote Control Unit

××××H××××

D)

30-1/4”×26-1/4”×21-1/2” inch / (768mm×667mm×547mm)

112.2lbs (51.0kg)

CCIR(M)
NTSC
BTSC (Multi Channel Sound)

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

(02～06, A-8) by (02～06&01)
(07～13) by (07～13)
(A～1) by (14～22)
(J～W) by (23～36)
(W+1～W+28) by (37～64)
(W+29～W+84) by (65～125)
(A8, A4～A1) by (01, 96～99)

180 Channels

45.75 MHz

41.25 MHz (4.5MHz)

3.58 MHz
120V AC, 60Hz
125W / 1.8A
32” (80cm) measured diagonally, Ful l Square

31.0kV±1.3kV (at zero beam current )
2”×4-3/4” / 5×12cm Oblong type×2

3W+3W

Y : 1Vp-p positive (negative sync provided, when term i nated with 75Ω)
C : 0.286Vp-p (burst signal, when terminated with 75Ω)

1Vp-p 75Ω (RCApin jack)
500mVrms (-4dBs ), High Impedance (RCA pin jack)

Variable: More then 0～1550mVrms (+6dBs)

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

Fix : 500mVrms(-4dBs)

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

3.5mm mini jack
75Ω (VHF/UHF) Termi nal , F-Type Connector

RM-C306-1A (AA/R6/UM-3 battery×2)

Design & specifications are subject to change without notice.

(54MHz

～

804MHz)

2

No.51782

A

SAFETY PRECAUTIONS

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

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

3. Many electrical and mechanical parts in the products have
special safety-related characteristi cs. These charact eris t ics are
often not evident from visual inspection nor c an 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 (
in Service manual.

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.

Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products
are connected to one side of the AC power line. An isolation
transformer of adequate capacity should be inserted between
the product and the AC power supply point while performing
any service on some products when the HOT chassis is
exposed.

5.

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 diff erent 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.

6. 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).

7. 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.

8. 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.

9. 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.

The use of a substitute replacement which

!!!!

) on the parts list

V-32220

10.

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, screwheads, 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
1100V 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 c urrent 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 sensitivi ty in the
following manner. Connect a 1500Ω 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 t o each exposed metal
part, particularly any exposed metal part having a return path to
the chassis, and measure the AC voltage across the res istor.
Now, reverse the plug in the AC outlet and repeat each
measurement. Any voltage measured must not exceed 0.75V
AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER
(HAVING 1000

GOOD
EARTH
GROUND

11.

High voltage hold down circuit check.

After repair of the high voltage hold down circuit, this circuit
shall be checked to operate correctly.
See item "

circuit

This mark shows a fast
operating fuse, the
letters indicated below
show the rating.

0.15μF AC-TYPE

Ω

10W

1500

How to check the high voltage hold down

".

OR MORE SENSITIVITY)

PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

POWER CORD
REPLACEMENT WARNING.

Connecting the white line side of power
cord to “WHT” character side.

Ω

/V,

A V

No. 51782

3

A

V-32220

FEATURES

"

New chassis design enables use of a main board with

simplified circuitry.

"

Digital comb filter Improved picture quality.

"

Full-s quare CRT (cathode ray tube) reproduces fine textured

picture in every detail.

"

Closed-caption broadcasts can be viewed.

"

With AUDIO. VIDEO INPUT terminal.

2

"

I

C bus control utilizes single chip ICs.

MAIN DIFFERENCE LIST

Model

!

Part name
MAIN PWB

PICTURE TUBE

!

DEG.COIL

!

AV-32220

SGF-1017A-M2 SGF-1002A-M2 SGF-1003A-M2

A80QCF240X14L A80LJF30X08(G) M80JUA061X06

QQW0086-001 CELD066-002JA

/G

"

S-VIDEO input terminal for taking best advantage of Super

VHS.

"

Variable / Fix audio output terminal.

"

With AV COMPU LINK EX terminal.

AV-32220

/H

AV-32220

/M

←

HOW TO IDENTIFY MODELS

The difference between
As the result of the difference in

!

Parts name

RATING LABEL LC31139-001A-A

!

AV-32220/G, AV-32220/H

PICTURE TUBE

MODEL

AV-32220

INDICATED AV-32220 INDICATED AV-32220 INDICATED AV-32220

INDICATED

and

AV-32220/M

, the

MAIN PWB

/G

““““G””””

is in the

also differ.

PICTURE TUBE

AV-32220

←←←←

INDICATED

/H

““““H””””

.

AV-32220

/M

←←←←

INDICATED

““““M””””

4

No. 51782

A

FUNCTIONS

V-32220

FRONT PANEL

① ② ⑤④ ⑥ ⑦

REMOTE CONTROL UNIT

④

⑤
⑥

⑦

⑧

⑩

⑭

③

①

②

③

⑫
⑨

⑬
⑪

①

INPUT 2(V, L, R)

②

MENU CONTROL KEY

③

CHANNEL UP/DOWN KEYS

④

VOLUME UP/DOWN KEYS

⑤

POWER BUTTON

⑥

ON TIMER LAMP

⑦

REMOCON WINDOW

①

POWER BUTTON

②

INPUT SELECT KEY

③

CHANNEL KEYS

④

VIDEO STATUS KEY

⑤

DISPLAY KEY

⑥

SLEEP TIMER KEY

⑦

HYPER SURROUND KEY

⑧

MUTING KEY

⑨

V-CHIP KEY

⑩

MENU KEY

⑪

EXIT KEY

⑫

VOLUME UP/DOWN KEYS

⑬

CHANNEL UP/DOWN KEYS

⑭

VCR CONTROL KEYS

REAR PANEL

①

①

INPUT 1(S, V, L, R)

②

INPUT 2(V, L, R)

②

③

⑤

④

No. 51782

③

AUDIO OUTPUT

④

AV COMPULINK EX JACK

⑤

AERIAL SOCKET

5

A

V-32220

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

"

Unplug the power supply cord.

1. Remove the 11 screws marked

2. Remove the rear cover toward you.

*

When reinstalling the rear cover, carefully push it inward after
inserting the chassis into the rear cover groove.

as shown in Fig.2.

AAAA

REMOVING THE CHASSIS

"

After removing the rear cover.

1. Slightly raise the both sides of the chassis by hand and remove
the 2 claws under the both sides of the chassis from the front
cabinet.

2. Draw the chassis backward along the rail in the arrow direction
marked
(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.

as shown in the Fig.2.

BBBB

REMOVING THE TERMINAL BOARD

"

After removing the rear cover.

1. Remove the 3 screws marked

2. After removing the claw marked
mark as shown in Fig.1.

3. When you pull out the TERMINAL BOARD in the direct ion of
arrow marked

as shown in Fig.1, it can be removed.

FFFF

as shown in Fig.2.

CCCC

in the direction of arrow

EEEE

CHECKING THE MAIN PW BOARD

1. To c heck t he backsi de of t he MAIN PW Board.
(1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).
(2) Erect the chassis vertically so that you can easily check the

backside of the MAIN PW Board.

[CAUTION]

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

•

contacting with other PWB.
Before turning on power, make sure that the CRT earth wire and

•

other connectors are properly connected.

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 t o tie the wires with
a new cable tie.

TERMINAL BOARD

REMOVING THE FRONT CONTROL PW BOARD

"

After removing the rear cover and chassis.

1. Remove the 2 screws marked

2. Then remove the FRONT CONTROL PWB.

as shown in Fig.2.

DDDD

REMOVING THE SPEAKER

"

After removing the rear cover and chassis.

1. Remove the 2 screws marked

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

as shown in Fig.2.

GGGG

F

E

Fig. 1

6

No. 51782

A

V-32220

FRONT CABINET

PICTURE TUBE

CRT SOCKET

PWB

FRONT

CONTROL

PWB

SPEAKER

G

AV SELECTOR

PWB

FRONT JACK

PWB

CLAW

MAIN PWB

TUNER

SPEAKER

REAR COVER

D

B

G

CLAW

C

CHASSIS BASE

TERMINAL

BOARD

POWER CORD

A

Fig.2

No. 51782

7

A

V-32220

A

A
A

A

A

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.3).

2. W hile keeping the surface of CRT down, mount the TV set on
the CRT change table balanced will as shown in Fig.4.

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

Since the cabinet will drop when screws have been removed,

"

be sure to support the cabinet with hands.

4. After 4 screws have been rem oved, 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.5.

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 surface, and its height be about 35cm.

CRT CHANGE TABLE

PPROX.

35cm

CLOTH

Fig. 3

CRT

CRT
CHANGE
TABLE

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.6.
Wipe around the anode button with clean and dry cloth. (Fig.6)
Coat silicon grease on the section around the anode button. At
this time, take care so that any silic on greases dose not sticks
to the anode button. (Fig.7)

★★★★

Silicon grease product No. KS - 650N

CRT

node button

CABINET

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

Fig. 4

CRT

CRT
CHANGE TABLE

Fig. 5

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

Silicon grease

coating

Fig. 6 Fig. 7

8

No. 51782

node button
(No sticking of
silicon grease)

Coating position
of silicon grease

node cap

A

SYSTEM BLOCK DIAGRAM

IC702

MEMORY

SDA1SCL1

IC701

MAIN MICON

SDA3SCL3

AFC

V-32220

IF

Remote

control

unit

IC601

MTS, TONE

SURROUND CONTROL

IC201

1 CHIP

CONTROL

TU001

TUNER

No.51782

9

A

V-32220

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

How to remove Chip parts

1.

####

Resistors, capacitors, etc

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

alternately melt the solder at each end.

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

####

Transistors, diodes, variable resistors, etc

(1) Apply extra solder to each lead.

SOLDER

SOLDER

2. How to install Chip parts

####

Resistors, capacitors, etc

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

(2) Gras p 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) Appl y 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

as indicated in the figure.

A

A

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

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

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

pattern.

10

No.51782

(4) Then solder leads

and C.

B

C

A

C

B

B