JVC HV32D25EUW - Service Manual Immediate Download

SERVICE MANUAL

No.52068

2002/12

HV-32D25EUW

HV-32D25EJW

COLOUR TELEVISION

52068

2002

HV-32D25EUW

HV-32D25EJW

CONTENTS

SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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

SERVICE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

BASIC CHASSIS

HV-32D25EUW

HV-32D25EJW

SPECIFICATION

Item

Content

HV-32D25EUW

HV-32D25EJW

Dimensions (W x H x D)

94.6cm x 56.2cm x 55.1cm

Mass

58.0kg

TV RF System

CCIR B/G, I, D/K, L/L'

Colour System

PAL / SECAM / NTSC

*The EXT terminals also support the NTSC 3.58MHz/4.43MHz system.

Stereo System

A2 (B/G, D/K) / NICAM (B/G, I, D/K, L)

Teletext System

FLOF(Fastext), TOP, WST(World Standard system)

Receiving Frequency

VHF

UHF

CATV

47MHz ~ 470MHz

470MHz ~ 862MHz

116MHz ~ 172MHz / 220MHz ~ 469MHz

47MHz ~ 470MHz (IRELAND only)

470MHz ~ 862MHz

Intermediate Frequency VIF

SIF

38.9MHz(B/G, D/K, I) / 33.95MHz(L')

33.4MHz(5.5MHz:B/G) / 32.9MHz(6.0MHz:I) / 32.4MHz(6.5MHz:L,D/K) /

40.45MHz(6.5MHz:L')

Colour Sub Carrier

Frequency

PAL

SECAM

NTSC

4.43MHz

4.40625MHz / 4.25MHz

3.58MHz / 4.43MHz

Power Input

AC 220V~AC240V, 50Hz

Power Consumption

Max 300W / Avg. 160W

Aerial Input

75 ohm unbalanced, coaxial

Picture Tube

Visible size 76 cm(measured diagonally) Aspect ratio 16:9

High Voltage

31.0kV

0.2kV (At beam current : 0uA )

Speaker

MAIN

CENTER

WOOFER

10W + 10W, 13 cm x 6.5 cm oval x2

7.5W, 16 cm x 4 cm oval x 1

18W, 13 cm round x 1

EXT-1 (Input/Output)

21 pin Euro connector (SCART socket)

· Video input, Audio L/R inputs and RGB inputs are available.

· TV broadcast outputs (Video and Audio L/R) are available.

EXT-2 (Input/Output)

21 pin Euro connector (SCART socket)

· Video input, S-Video (Y/C) input, Audio L/R inputs and RGB inputs are available.

· Video and Audio L/R outputs are available.

· T-V LINK functions are available.

EXT-3 (Input/Output)

21 pin Euro connector (SCART socket)

· Video input, S-Video (Y/C) input and Audio L/R inputs are available.

EXT-4 (Input)

Component

video

RCA pin jack x 3

Y : 1V(p-p), 75 ohm

Pb / B-Y: 0.7V(p-p), 75 ohm

Pr / R-Y : 0.7V(p-p), 75 ohm

Progressive-scanning signals(626p or 525p) are available

Audio (L/R)

500mv(rms) (-4dBs), High Impedance RCA pin jack x 2

EXT-5 (Input)

Video

1V(p-p), 75 ohm RCA pin jack x 1

Audio (L/R)

500mv(rms) (-4dBs), High Impedance RCA pin jack x 2

S-Video

Mini DIN 4-pin

Y : 1V(p-p) Positive (Negative sync provided), 75 ohm

C : 0.286V(p-p) (burst signal), 75 ohm

DIGITAL AUDIO INPUT

OPTICAL x 1

COAXIAL x 1 (Dolby Digital is available.)

AUDIO OUT (Variable)

0~1V(rms), Low Impedance RCA pin jack x 3

SURROUND REAR OUT

7.5W + 7.5W, 8 ohm (push terminal)

Headphone jack

Stereo mini jack (Ø3.5mm)

Remote Control Unit

RM-C61 (AAA/R03 Dry cell battery x 2) : HV-32D25EUW

RM-C62 (AAA/R03 Dry cell battery x 2) : HV-32D25EJW

Design & specifications are subject to change without notice.

Manufactured under license from Dolby Laboratories Licensing Corporation.

"Dolby" and the double-D symbol (

)are trademarks of Dolby Laboratories Licensing Corporation.

HV-32D25EUW

HV-32D25EJW

21-pin Euro connector (SCART) : EXT-1/EXT-2/EXT-3

(P-P= Peak to Peak, B-W= Blanking to white peak)

PinNo.

Signal Designation

Matching Value

EXT-1

EXT-2

EXT-3

AUDIO R output

500mV(rms) (Nominal),

Low impedance

Used (TV OUT)

Used (LINE OUT) NC

AUDIO R input

500mV(rms) (Nominal),

High impedance

Used

AUDIO L output

500mV(rms) (Nominal),

Low impedance

Used (TV OUT)

Used (LINE OUT) Not used

AUDIO GND

Used

GND (B)

Used

AUDIO L input

500mV(rms) (Nominal),

High impedance

Used

B input

700mV(B-W), 75 ohm

Used

Not used

FUNCTION SW

(SLOW SW)

Low : 0V-3V, High : 8V-12V,

High impedance

Used

GND (G)

Used

SCL

Not used

Used (SCL2)

Used (SCL3)

G input

700mV(B-W), 75 ohm

Used

Not used

SDA

Not used

Used(SDA2)

Used(SDA3)

GND (R)

Used

GND (YS)

Used

Not used

R / C input

R : 700mV(B-W), 75 ohm

C : 300mV(P-P), 75 ohm

Used (R)

Used (C2/R)

Used (C3)

Ys input

(FAST SW)

Low : 0V-0.4V, High : 1V-3V,

75 ohm

Used

Not used

GND (VIDEO output)

Used

GND (VIDEO input)

Used

VIDEO output

1V(P-P) (Negative going sync),

75 ohm

Used (TV OUT)

Used (LINE OUT) Not used

VIDEO / Y input

1V(P-P) (Negative going sync),

75 ohm

Used

COMMON GND

Used

[Pin assignment]

HV-32D25EUW

HV-32D25EJW

SECTION 1

SAFETY PRECAUTIONS

1.1 HV-32D25EUW

(1) The design of this product contains special hardware,

many circuits and components specially for safety purpos-

es. 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 per-

formed 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 prop-

erty damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteris-

tics 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 Ser-

vice manual. Electrical components having such fea-

tures 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 ISO-

LATED (NEUTRAL) 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 the LIVE side GND and ISOLATED (NEUTRAL)

side GND or EARTH side GND at the same time with a

measuring apparatus (oscilloscope etc.).

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 recom-

mended 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 volt-

age 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 min-

imum, or should be prevented. If severe arcing occurs, re-

move the AC power immediately and determine the cause

by visual inspection (incorrect installation, cracked or melt-

ed high voltage harness, poor soldering, etc.). To maintain

the proper minimum level of soft X-Ray emission, compo-

nents in the high voltage circuitry including the picture tube

must be the exact replacements or alternatives approved

by the manufacturer 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. Dis-

charge the picture tube before attempting meter connec-

tion, by connecting a clip lead to the ground frame and

connecting the other end of the lead through a 10k

resistor to the anode button.

(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 isola-

tion check on the exposed metal parts of the cabinet (an-

tenna 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.

a) 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 ap-

pliance rated up to 120V, and 3000V AC (r.m.s.) to an ap-

pliance rated 200V or more, for a period of one second.)

This method of test requires a test equipment not general-

ly found in the service trade.

b) 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 chas-

sis, 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 sen-

sitivity in the following manner. Connect a 1500 ohm

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 con-

nection to each exposed metal part, particularly any ex-

posed metal part having a return path to the chassis, and

measure the AC voltage across the resistor. Now, re-

verse the plug in the AC outlet and repeat each measure-

ment. 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

/V,

OR MORE SENSITIVITY)

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

1500

10W

0.15uF AC-TYPE

GOOD EARTH GROUND

HV-32D25EUW

HV-32D25EJW

1.2 HV-32D25EJW [UK VERSION]

(1) The design of this product contains special hardware and 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. Re-

placement 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 product should not be made. Any design alterations or additions will void the manu-

facturer'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 product have special safety-related characteristics. These characteristics are often

not evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacement com-

ponents 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 the 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) The leads in the products are routed and dressed with ties, clamps, tubing's, barriers and the like to be separated from live

parts, high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When

service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been

returned to normal, after re-assembling.

WARNING

(1) The equipment has been designed and manufactured to meet international safety standards.

(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

(3) Repairs must be made in accordance with the relevant safety standards.

(4) It is essential that safety critical components are replaced by approved parts.

(5) If mains voltage selector is provided, check setting for local voltage.