JVC HV-34LZ, HV-34LZ/-A, HV-34LZ/EE, HV-34LZ/HK Service Manual

HV-34LZ

SERVICE MANUAL

COLOUR TELEVISION

HV-34LZ

HV-34LZ/HK

HV-34LZ/-A

HV-34LZ/EE

BASIC CHASSIS

MF

[RM-C1030]	[RM-C1031]
HV-34LZ	HV-34LZ /HK
HV-34LZ /-A
HV-34LZ /EE

CONTENTS

! SPECIFICATIONS 2	! SPECIFIC SERVICE INSTRUCTIONS 8
! SAFETY PRECAUTIONS 3	! SERVICE ADJUSTMENTS 15
! MAIN DIFFERENCE LIST 4	! PARTS LIST 37
! FEATURES 4	OPERATING INSTRUCTIONS
! FUNCTIONS 6	STANDARD CIRCUIT DIAGRAM 2-1

1	COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.	No.52020
		Sep. 2002

HV-34LZ

SPECIFICATIONS

Item	Content

Dimensions ( W×H×D )

Mass

TV RF System

Colour System

Stereo System

Teletext System

		VL
Receiving		VH
Frequency		UHF
		CATV
Intermediate		VIF
Frequency		SIF
		PAL
Colour Sub Carrier		SECAM
Frequency
		NTSC
Power Input
Power Consumption
Aerial Input Term
Picture Tube
High Voltage
Audio Power Output
Speaker
		Video
		Audio(L/R)
Input		S / Video
Terminal
		Component Cb/Cr
Output		Video
Terminal		Audio(L/R)
AV Compulink
Headphone jack
Remote Control Unit

89.8cm×72.8cm×57.9cm
68.0kg
B/G, I, D/K, K1, M
PAL / SECAM / NTSC 3.58 / NTSC 4.43
A2 (B/G) / NICAM (B/G, I, D/K)
Fastext (UK system) *	[ * Without TEXT mode : HV-34LZ/HK ]
WST(world standard text)
46.25MHz 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 240V , 50/60Hz Max 215W / Avg. 153W 75Ωunbalanced, Coaxial 34”(87cm) measured diagonally

+1.0kV

32.0kV -1.5kV (At zero beam current ) 7W + 7W

5×12cm Oval type×2 1Vp-p 75Ω

500mV(rms) (-4dBs), High Impedance

Y: 1V(p-p) Positive (Negative sync provided) 75Ω C : 0.286V(p-p) (burst signal), 75Ω

Y: 1V(p-p), 75Ω

Cb : B-Y 0.7V(p-p), 75Ω / Cr : R-Y 0.7V(p-p), 75Ω 1V(p-p) 75Ω

500mV(rms) (-4dBs), Low Impedance Mono mini jack (φ3.5mm )

Stereo mini jack (φ3.5mm )

RM-C1030 (AA/R06 / UM-3 , Dry cell battery×2) : HV-34LZ / HV-34LZ/-A / HV-34LZ/EE

RM-C1031 (AA/R06 / UM-3 , Dry cell battery×2) : HV-34LZ/HK

Design & specifications are subject to change without notice.

2

No.52020

HV-34LZ

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 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 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 ISOLATED (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 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 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.

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 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 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 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 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 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 sensitivity 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 to each exposed metal part, particularly any exposed metal part having a return 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 area, this must not exceed 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	ON EACH EXPOSED
	METAL PART
GOOD EARTH GROUND

No.52020

3

HV-34LZ

MAIN DIFFERENCE LIST

	!	Model name	HV-34LZ	HV-34LZ/HK	HV-34LZ/-A	HV-34LZ/EE
		Part name
		MICOM PWB	SMF-0M701A	SMF-0M702A	SMF-0M703A	SMF-0M704A
			QMP40D0-200J5		QMPR010-200-E2
	!	POWER CORD	or	QMPN050-200-E2	or	QMP40D0-200J5
			QMP40D0-200J3		QMPR010-200-K2
		JVC MARK	LC41037-001A	LC41037-003A	LC41037-001A
	!	REAR COVER	LC10180-003A-HH	LC10180-005A-H	LC10180-003A-HH
	!	INST BOOK	LCT1200-001A-H	LCT1201-001A-H	LCT1200-001A-H	LCT1202-001A-H
		REMOTE CONTROL UNIT	RM-C1030-1H	RM-C1031-2H	RM-C1030-1H
	!	DIGEST MANUAL	×	×	LCT1203-001A-H	×
	!	CONVERSION PLUG	×	×	QAM0055-001	×
		WARRANTY CARD	×	×	×	BT-54012-2

	TELETEXT		FASTEXT			○	×	○	○
			WST

FEATURES

"New chassis design enable use of an interactive on screen control.

"The TELETEXT SYSTEM has a built-in FASTEXT (UK system), and WST (world standard text system).

* Except HV-34LZ/HK.

"Built-in ECO (ECONOMY, ECOLOGY) MODE.

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.

"Pure FLAT CRT reproduce fine textured.

"Digi Pure pro : Auto digi pure with motion picture compensation.

"Because this TV unit corresponds to multiplex broadcast, users can enjoy music programs and sporting events with live realism. In addition, BILINGUAL programs can be heard in their original language.

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No. 52020

HV-34LZ

SYSTEM BLOCK DIAGRAM

	MICON PWB
	IC004		IC001
		MICRO COMPUTER
	MEMORY
		SDA 0
		SCL 0
		SDA 2	SDA 1
		SCL 2	SCL 1
	MAIN PWB
	IC661		IC301
	3D SURROUND		DEF & RGB
	/ VOL / TONE		PROCESSOR
	IC101		TU001
	MULTI SOUND
			TUNER
	PROCESSOR
	AV SW PWB		100Hz PWB
			IC101
	IC101		VIDEO PROCESS
	SW		&
			CODEC
			IC201
			SAMPLE RATE
			CONVERTER
			IC301
			ENHANCE

No. 52020

5

HV-34LZ

FUNCTIONS

■ Front Terminal & Control

1HEADPHONE jack	7SENSOR(Remote Control & ECO)
2VIDEO-4 terminal (S-VIDEO / VIDEO / L/MONO / R)	8CINEMA SURROUND LAMP
3MENU/OK Button	9ECO LAMP
4CHANNEL -/+ (MENU UP/DOWN) Button	APOWER LAMP
5VOLUME -/+ (MENU LEFT/RIGHT) Button	BPOWER SW Button
6TV/VIDEO / EXIT Button

■ Rear Terminal

1VIDEO-1 (INPUT) terminal (S, V, L, R) 2VIDEO-2 (INPUT) terminal (V, L, R)

3VIDEO-3 (INPUT) terminal (V/Y, Cb, Cr, L, R) / COMPONENT

4OUTPUT (AUDIO/VIDEO) terminal (V, L, R)

5AV COMPULINK terminal

6AERIAL socket

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No. 52020

■Remote Control Unit

RM-C1030 : HV-34LZ, HV-34LZ/-A,HV-34LZ/EE

	2	1
	5	3
	6	4
	7
		8
	9
	10	13
	11
		14
	12
	16	15
	17	18
		19
		20

RM-C1031 : HV-34LZ/HK

	2	1
	5	3
	6	4
	7
		8
	9
	10
	11
		14
	12
	16	15
	17	18
		19

HV-34LZ

1POWER Key

2MUTING Key

3ZOOM Key

4CINEMA SURROUND Key

5COLOUR SYSTEM Key

6SOUND SYSTEM Key

7DISPLAY Key

8MENU / OK Key

9FUNCTION Key ( ▲/▼ &/Key ) ASTEREO / Key

: Stereo / : Mono

: Bilingual (sub )

: Bilingual (sub ) BTV/VIDEO Key

CPICTURE MODE Key DTV/TEXT Key

ECHANNEL Key F-/-- Key

GRETURN + Key HCHANNEL +/- Key IVOLUME +/- Key JCOLOUR Key

KTELETEXT Key

1POWER Key

2MUTING Key

3ZOOM Key

4CINEMA SURROUND Key

5COLOUR SYSTEM Key

6SOUND SYSTEM Key

7DISPLAY Key

8MENU / OK Key

9FUNCTION Key ( ▲/▼ &/Key ) ASTEREO / Key

: Stereo / : Mono

: Bilingual (sub )

: Bilingual (sub ) BTV/VIDEO Key

CPICTURE MODE Key ECHANNEL Key

F-/-- Key

GRETURN + Key HCHANNEL +/- Key IVOLUME +/- Key JCOLOUR Key

No. 52020

7

HV-34LZ

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1.Unplug the power cord.

2.Remove the 18 screws marked ! as shown in the Fig. 1.

3.Withdraw the rear cover toward you.

REMOVING THE AV TERMINAL BOARD

" After removing the rear cover.

1.Remove the 5 screws marked " as shown in the Fig. 1.

2.Withdraw the AV terminal board toward you.

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.Withdraw the chassis backward.

(If necessary, take off the wire clamp, connectors etc.)

REMOVING THE SPEAKER

" After removing the rear cover.

1. Remove the 2 screws marked #, and remove the speaker holder as shown in Fig. 1.

NOTE : When removing the screws marked # of the speaker holder remove the lower side screw first, and then remove the upper one.

2.Remove the 4 screws $ attaching the speaker.

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

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]

"When erecting the chassis, be careful so that there will be no contacting with other PW Board.

"Before turning on power, make sure that the wire connector is properly connected.

"When conducting a check with power supplied, be sure to confirm 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.

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No.52020

					HV-34LZ
	FRONT CABINET		SPEAKER
			HOLDER
					C
					(×2)
		CRT SOCKET			D
					(×4)
		PWB
				SPEAKER
		FRONT CONTROL
		PWB (L)
		CONTROL	MICOM
			PWB
		BASE		CLAW	POWER & DEF.
					PWB
		FRONT
		CONTROL			CHASSIS
		PWB (R)
		C			AV TERMINAL
		(×2)			BOARD
		CONTROL
		BASE		BLK PWB
		MAIN PWB
				100Hz PWB
		CLAW
		D
		AV SW PWB
SPEAKER		(×4)
HOLDER	SPEAKER
REAR COVER					B
					(×5)
				POWER CORD
		A (×18)

Fig. 1

No.52020

9

HV-34LZ

REMOVING THE CRT

Replacement of the CRT should be performed by 2 or more persons.

• After removing the 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.While 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.

•Since the cabinet will drop when screws have been removed, be sure to support the cabinet with hands.

4.After 4 screws have been removed, 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. (Fig.3)

About CRT Spacer (Fig.4)

An appropriate CRT spacer should be used 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.

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 silicon greases dose not stick to the anode button. (Fig.7)

Silicon grease product No. KS - 650N

CRT	Anode button

Silicon grease coating

Fig. 6

CRT CHANGE TABLE

APPROX.

35cm

CLOTH

Fig. 3

Fig. 4

CRT

CABINET	CRT
	CHANGE TABLE
	Fig. 5
Approx.	Silicon grease
20mm (Do not	should be coated
coat grease on	by 5mm or more
this section	from the outside
	diameter of
	anode cap.
Anode button	Coating position
(No sticking of
silicon grease)	of silicon grease
	Anode cap
	Fig. 7

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No. 52020

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. 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 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 cord into the wall outlet and switch the power on.

HV-34LZ

SERVICE MENU

1. IF	2. V/C
3. AUDIO	4. DEF
5. VSM PRESET	6. STATUS
7. WB PRESET	8. SHIPPING(OFF)
9. BUS FREE
1-9 : SELECT	DISP : EXIT

Fig.1

(4)Check and set SYSTEM CONSTANT SET:

* It must not adjust without signal.

1)Press the DISPLAY key and the PICTURE TUBE 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, press the DISPLAY key and PICTURE TUBE key simultaneously, and the SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.

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 ▲/▼ key, and set the correct value with the FUNCTION / key.

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

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

SYSTEM CONSTANT SET

1. TEXT **

+OK : STORE DISP : EXIT

Fig.2

2. BLUE BACK MENU		**
3.	E.M.C	**
4.	WHITE BACK	**
5. COLOUR AUTO		**
6.	PICTURE TILT	**

(5)Setting of receive channels

Set the receive channel.

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

SERVICE MENU KEY

							ZOOM
							(ASPECT)
SERVICE							key
MENU /
& SYSTEM							FUNCTION key
CONSTANT		(					▲/▼ & / key)
key
							MENU / OK key
							MEMORY
							(STORE) key
							SETTING ITEM
							SELECT key
							(Numbers key)

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.

No. 52020

11