JVC HV-L34PRO/K Service Manual

SERVICE MANUAL

COLOUR TELEVISION

HV-L34PRO

BASIC CHASSIS

MF

HV-L34PRO

/K

CONTENTS

SPECIFICATIONS



SAFETY PRECAUTIONS



FEATURES



FUNCTIONS



SPECIFIC SERVICE INSTRUCTIONS



SERVICE ADJUSTMENTS



PARTS LIST



★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

1

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COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

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14
37

2-1

2
3
4
6
8

No.51938
Jul. 2001

HV-L34PRO

SPECIFICATIONS

Item Content

Dimensions ( W

Mass

TV RF System

Colour System

Stereo System

Receiving

Frequency

Intermediate

Frequency

Color Sub Carrier

Frequency

Power Input

Power Consumption

Aerial Input Term

Picture Tube

High Voltage

Audio Power Output

Speaker (Dome Speaker)

Input

Terminal

Output Video

Terminal

AV Compulink

Headphone jack

Remote Control Unit

D )

××××H××××

Operated Voltage

Video

Audio(L/R)

S / Video

Component Cb/Cr

Audio(L/R)

VL

VH

UHF

CATV

VIF

SIF

PAL

SECAM

NTSC

Rated Voltage

89.8cm×72.8cm×57.9cm

75.0kg

B/G, I, D/K, K1, M

PAL / SECAM / NTSC 3.58 / NTSC 4.43

A2 (B/G) / NICAM (B/G, I, D/K, K1)

46.25MH z ～ 168.25MHz

175.25MHz ～ 463.25MHz

471.25MHz ～ 863.25MHz

Mid (X～Z+2, S1～S10), Super (S11～S20) & Hyper (S21～S41)

38.0MHz

32.5MHz(5.5MHz) / 32.0MHz(6.0MHz) / 3.15MHz(6.5MHz) / 33.5MHz (4.5MHz)

4.43MHz

4.40625MHz / 4.25MHz

3.58MHz / 4.43MHz

AC 110V～220V , 60Hz

AC 110V～240V , 50/60Hz

Max 255W / Avg. 170W

75Ωunbalanced, Coaxial

34”(87cm) measured diagonally

+1.0kV

32.0kV (At zero beam current )

20W + 20W

φ

1Vp-p 75

500mVrms(-4dBs), High Impedanc e

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

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

Y : 1V(p-p), 75

Cb : B-Y 0.7V(p- p), 75Ω / Cr : R-Y 0.7V(p-p), 75

1V(p-p) 75

500mVrms(-4dBs), Low Impedanc e

Mono mini jack (φ3.5mm )

Stereo mini jack (φ3.5mm )

RM-C215 (AA/R06 / UM-3 , Dry cell battery×2)

-1.5kV

12cm Round type×2 / φ3.5cm Round type×2

Ω

Ω

Ω

Ω

Ω

Ω

Design & specifications are subject to change without notice

2

No.51938

.

SAFETY PRECAUTIONS

HV-L34PRO

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 t o the original
design unless authorized in writing by the manufacturer.
Replacement parts must be identical to those us ed 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 t he 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.

components having such features are identified by shading
on the schematics and by (
manual.

have the s ame safety char acteristics as the recommended
replacement part shown in the parts list of S ervice manual may
cause shock, fire, or other hazards.

The us e of a substitute replacement which does not

) on the parts list in Service



Electrical

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 (oscillosc ope 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 adjust ed (See
ADJUSTMENT OF B1 POWER SUPPLY).

6. The high voltage applied to the picture tube must conform with
that specified in Servic e manual. E xcessive 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 s evere 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 circuitr y
including the picture tube must be the exact replacements or
alternatives approved by the manufacturer of the c omplete
product.

7. Do not check high voltage by drawing an arc. Use a high voltage
meter or a high voltage probe with a VT VM. 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 10k: 2W resistor to the anode button.

8. W hen service is required, observe the original lead dress. Extra
precaution should be given to assure c orrect lead dress in the
high voltage circuit area. W here a short circuit has occ urred,
those components that indicate evidence of overheating should
be replaced. Always use the manuf acturer's replacement
components.

9.

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 c abinet, screwheads, earphone jack, control shafts, etc.)
to be sure the product is safe to operate without danger of
electr ic al 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 3000V
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 f ound
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 during 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 curr ent 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 M ethod

zzzz

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 sensitivity in the following
manner. Connect a 1500: 10W resistor paralleled by a 0.15PF
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 to each exposed metal part, particularly any exposed
metal part having a retur n path to the chassis, and measure the
AC voltage across the resistor. 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 ar ea, this must not exceed 0.3V AC (r.m.s.).
This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER

0.15μF AC-T YPE

1500

GOOD EARTH GROUND

:

(HAVING 1000
OR MORE SENSITIVITY)

10W

/V,

:

PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

No.51938

3

HV-L34PRO

FEATURES

New chassis design enable use of an interactive on screen

z

control.

Pure FLAT CRT reproduce fine textured.

z

Digi Pure pro : Auto digi pure with motion pictur e compensation.

z

Because this TV unit corresponds to multiplex broadcast, users

z

can enjoy music programs and sporting events with live realism.
In addition, BILINGUAL programs can be heard in their original
language.

Built-in ECO (ECONOMY, ECOLOGY) MODE.

z

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

4

No. 51938

SYSTEM BLOCK DIAGRAM

MICON PWB

HV-L34PRO

IC004

MEMORY

SDA 0
SCL

0

SDA 2
SCL 2

IC001

MICRO COMPUTER

SDA 1
SCL

1

MAIN PWB

IC701

BBE CONTROL

IC101

MULTI SOUND

PROCESSOR

IC301

DEF & RGB

PROCESSOR

TU001

TUNER

SYNC SEP PWB 100Hz PWB

IC301

SYNC SEP PWB

AV SW PWB

IC101

SW

TU001

TUNER

IC101

VIDEO PROCESS

&

CODEC MAIN

IC151

VIDEO PROCESS

&

CODEC SUB

IC201

SAMPLE RATE

CONVERTER

IC301

ENHANCE

No. 51938

5

HV-L34PRO

FUNCTIONS

■■■■

Front Terminal & Control

1
2
3
4
5
6

■■■■

Rear Terminal

Headphone jack

Video-4 T erminal (S-VIDEO / VIDEO / L/MONO / R)

MENU/OK Button
Channel -/+ (MENU UP/DOWN) Button

VOLUME -/+ (MENU LEFT/RIGHT) Button

TV/VIDEO / EXIT Button

SENCER (Remote Control & ECO)

7

SPATIALIZER Lamp

8

ECO Lamp

9

POWER Lamp

A

POWER SW Button

B

Video-1 (INPUT) Terminal (S, V, L, R)

1

Video-2 (INPUT) Terminal (V, L, R )

2

Video-3 (INPUT) Terminal (V/Y, Cb, Cr, L, R)

3

Output (AUDIO/VIDEO) T erminal (V, L, R)

4

AV COMPULINK T erminal

5

Aerial socket

6

6

No. 51938

■■■■

Remote Control Unit

POWER Key

1

BASS Key

2

SPATIALIZER Key

3

TV/VIDEO Key

4

PICTURE MODE Key

5

ZOOM Key

6

CHANNEL Key

7

-/-- Key

8

RETURN + Key

9

MULTI Key

A

VOLUME +/- Key

B

CHANNEL +/- Key

C

MUTING Key

D

PIP MODE

E

PIP Key

F

POSITION Key

G

FREEZE Key

H

SUB P (PIP)+&- Key

I

NEXT Key

J

SWAP Key

K

STROBE Key

L

DISPLAY Key

M

STEREO Ⅰ/ⅡKey

N

: Stereo / : Mono

: Bilingual (subⅠ)

Ⅰ

: Bilingual (subⅡ)

Ⅱ

HV-L34PRO

FUNCTION Key(▲/▼&

O

MENU/OK Key

P

COLOR Key

Q

COLOR SYSTEM Key

R

SOUND SYSTEM Key

S

/ )

No. 51938

7

HV-L34PRO

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power cord.

2. Remove the 18 screws marked

3. W ithdraw the rear cover toward you.

as shown in the Fig. 1.

####

REMOVING THE AV TERMINAL BOARD

After removing the rear cover.

z

1. Remove the 5 screws marked

2. W ithdraw the AV terminal board towar d you.

as shown in the Fig. 1.

$$$$

REMOVING THE CHASSIS

After removing the rear cover.

z

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. W ithdraw the chassis backward.
(If necessary, take off the wire clamp, connectors etc.)

REMOVING THE DOME SPEAKER BOX / SPEAKER

After removing the rear cover.

z

1. As shown in Fig. 1, remove the 2 screws marked
remove the dome speaker box.

2. Remove the 5 scr ews marked
remove the dome box.

3. Remove the 4 scr ews marked
remove the speaker.

4. Follow the same steps when removing the other hand dome
speaker box.

: When removing the screws marked

NOTE

box, remove the lower side scr ew first, and then remove the
upper one.

as shown in the Fig.2, then

&&&&

as shown in the Fig.2, then

''''

of the dome speaker

%%%%

%%%%

, then

CHECKING THE PW BOARD

To check the back side of the PW Board.

1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).

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

[CAUTION]

W hen erecting the chassis, be careful so that there will be no

z

contac ting with other PW Boar d.

Before turning on power, make sure that the wire connector is

z

properly connected.

When conducting a check with power supplied, be sure to confir m

z

that the CRT EARTH WIRE (BRAIDED ASS’Y) is connected to
the CRT SOCKET PW board.

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 to tie the wires with
a new cable tie.

DOME SPEAKER BOX

z

DOME

SPEAKER

SPEAKER
BOX

REMOVING THE TWEETER SPEAKER

After removing the rear cover.

z

1. As shown in Fig. 1, remove the 2 screws marked
out the tweeter speaker to remove it.

8

, then pull

((((

No.51938

DOME
SPEAKER

(Hone & Hone Panel)

(×4)

Fig. 2

E

(×5)

D

TWEETER
SPEAKER

HV-L34PRO

TWEETER
SPEAKER

FRONT CABINET

F

FRONT
CONTROL
PWB (R)

CONTROL
BASE

MAIN PWB

CRT
SOCKET
PWB

CLAW

F

FRONT
CONTROL
PWB (L)

CONTROL
BASE

AV SW PWB

MICON

PWB

100Hz

PWB

CLAW

BLK

PWB

DOME
SPEAKER BOX

POWER & DEF
PWB

CHASSIS

AV TERMINAL
BOARD

C

DOME
SPEAKER BOX

B

C

POWER CORD

REAR COVER

(×18)

A

(×5)

Fig. 1

No.51938

9

HV-L34PRO

A

REMOVING THE CRT

Replacement of the CRT should be performed by 2 or more



persons.

After removing the cover, chassis etc.,

x

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 screw driver

as shown in Fig.4.

Sinc e the cabinet will drop when scr ews have been removed, be

x

sure to support the cabinet with hands.

4. After 4 screws have been r emoved, 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

x

sequence of its dismounting steps.

The CRT change table should preferably be smaller that the CRT



surface, and its height be about 35cm. (Fig.3)

About CRT Spacer (Fig.4)



An appropriate CRT spacer should be us ed in the corresponding
CRT in accordance with the type of the CRT.
When a CRT is replaced, special attention should be paid to this
matter.

CRT CHANGE TABLE

CLOTH

Fig. 3

PPROX.

35cm

COATING OF SILICON GREASE FOR ELECTRICAL
INSULATION ON THE CRT ANODE CAP SECTION.

Subs equent to replacement of the CRT and HV transformer or

x

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 s ection around the anode button. At
this time, take care so that any silicon greases dose not stick to
the anode button. (Fig.7)

Silicon grease product No. KS - 650N

★★★★

CRT

Anode button

Silicon grease

coating

CABINET

Approx.
20mm (Do not
coat greas e on
this section

Anode button
(N o sticking of
silicon gr ease)

Fig. 4

CRT

CRT
CHANGE TABLE

Fig. 5

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

Coating position
of silicon grease

Anode c ap

Fig. 6 Fig. 7

10

No. 51938

REPLACEMENT OF MEMORY ICs

1. Memory ICs

This TV use memory ICs. In the memory ICs, there are memorized data
for correctly operating the video and deflection circuits. W hen replacing
memory ICs, be sure to use ICs written with the initial values of data.

HV-L34PRO

2. Procedure for replacing memory ICs

(1)

Power off

Switch the power off and unplug the power cord from the wall outlet.

(2)

Replace ICs

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

(3)

Power on

Plug the power c ord into the wall outlet and switch the power on.

(4)

Check and set SYSTEM CONSTANT SET:

It must not adjust without signal.

****

.

1. IF 2. V/C

3. AUDIO 4. DEF

5. VSM PRESET 6. STATUS

7. PIP 8. WB PRESET

9. SHIPPING(OFF) 0. BUS FREE

1-0 : SELECT D ISP : EXIT

SERVICE MENU

Fig.1

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 S ERVICE MENU is dis played, press the DISPLAY key and PICTURE MOD E key simult aneously, and the SYSTEM
CONSTANT SET screen of Fig. 2 will be dis played.

4) Check the setting values of the SYSTEM CONSTANT SET of Table 1. If the value is different, select the setting item with the
FUNCTION UP/DOWN key, and set the correct value with the FUNCTION LEFT/RIGHT key.

5) Press the MENU(OK) key to memorize the setting value.

6) Press the DISPLAY key, and return to the normal screen.

SERVICE MENU KEY

SYSTEM CONSTANT SET

1. TEXT

**

OK

+ : STORE DISP : EXIT

Fig.2

**
**
**
**
**

(5)

Setting of receive channels

2. BLUE BACK MUTE

3. E.M.C

4. WHITE BACK

5. COLOUR AUTO

6. PICTURE TILT

Set the r eceive c hannel.
For setting, refer to the OPERATING INSTRUCTIONS.

(6)

Setting of SERVICE MENU

Verify the setting items of the

SERVICE MENU

of Table 2, and
reset where necessary.
For setting, refer to the SERVICE ADJUSTMENTS.

(7)

User settings

Check the user setting values of Table 3, and if setting value is
different , set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.

ZOOM

(ASPECT )

key

SETTING ITEM

SELECT key

(Numbers key)

PICTURE

CONTENTS

key

PIP key

FUNCTION key

(UP/DOWN &

LEFT/RIGHT key)

MENU/OK key

MEMORY

(STORE)

key

SERVICE
MENU/
&SYSTEM
CONSTANT
key

No. 51938

11

HV-L34PRO

SETTING VALUES OF SYSTEM CONSTANT SET (TABLE 1)

Setting item Setting value

1. TEXT NO

2. BLUE BACK MUTE

3. E. M. C

4. WHITE BACK

5. COLOUR AUTO

6. PICTURE TILT YES

↑

↑

↑

↑

SERVICE MENU SETTING ITEMS (TABLE 2)

Setting item Setting value Setting item Setting value

1. IF 1. VCO

2. ATT ON / OFF

2. V / C 1. RGB BLK

2. WDR R

3. WDR G

4. WDR B

5. BRIGHT

6. CONTRAST

7. COLOR

8. HUE

9. SHARP

11. VID AGC

12. SYC SLI

5. VSM PRESET

BRIGHT
STANDARD
SOFT

6. STATUS

(Do not adjust)

(Don’t change)

1. CONT.

2. BRIGHT

3. SHARP

4. COLOR

5. TINT

1. SOFT

2. TELETEXT
ASPECT

3.

Indicated for STATUS.

*

This is not related to the adjustment.

3. AUDIO

(Do not adjust)

4. DEF. 1. V-SHIFT

1. ERR LI MIT

2. A2 ID THR

3. QUASI

2. V-SIZE

3. H-CENT

4. H-SIZE

5. TRAPEZ

6. EW-PIN

7. COR-PIN

8. COR-UP

9. COR-LO

10. ANGLE

11. BOW

12. V-S.CR

13. V.LIN

14. V.BLK-UP

12

7. PIP 1. PIP VCO ADJ

8. WB PRESET 1. WDR R

9. SHIPPING (OFF)

0. BUS FREE.

No. 51938

2. PIP VID AGC

3. PIP SYC SLI

2. WDR G

3. WDR B

Don’t select under the adjustment as this

*

menu is set in ON after the inspection.

When users press the MAIN POWER

*

button, the JVC logo appears. If they press
any keys, the LANGUAGE menu appears.

*

Don’t Adjust.