Jvc TH-G40, TH-G30 Service Manual

SERVICE MANUAL

DVD DIGITAL THEATER SYSTEM

TH-G40J, TH-G40C, TH-G40UJ,

TH-G30J, TH-G30C

TH-G40		SP-THG50W
	SP-THG50F	SP-THG50F (for Rear)
	SP-THG50C
	XV-THG40

TH-G30		SP-THG50W
	SP-THG50F	SP-THG50F (for Rear)
	SP-THG50C
	XV-THG30

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

COPYRIGHT © 2008 Victor Company of Japan, Limited

No.MB672<Rev.002>

2008/9

		SPECIFICATION
	TH-G40
		General
	Power supply		Refer to main label.
	Power consumption		Refer to main label.
	Net Weight		4 kg
	External dimensions (W x H x D)		430 x 72 x 307 mm
	Operating conditions		Temperature: 5°C to 35°C Operation status: Horizontal
	Operating humidity		5% to 85%
	Laser		Semiconductor laser, wavelength 650 nm
		CD/DVD
	Video system		NTSC
	Frequency response (audio)		140 Hz to 20 kHz *
	Signal-to-noise ratio (audio)		More than 75 dB (1 kHz 20 kHz LPF/A-Filter) *
	Dynamic range (audio)		More than 75 dB *
	Harmonic distortion (audio)		0.5 % (1 kHz at 1W position) (20 kHz LPF) *
		Video
	Video output		1.0 V (p-p) 75 Ω negative sync. RCA jack x 1
	COMPONENT VIDEO OUT		(Y) 1.0 V (p-p) 75 ohms negative sync RCA jack x 1
			(PB)/(PR) 0.7 V (p-p) 75 ohms RCA jack x 1
	HDMI OUT		480p/720p/1080i/1080p
		Tuner (FM)
	Tuning Range		87.5 - 108.0 MHz
	Intermediate Frequency		10.7 MHz
	Signal-to Noise Ratio		60 dB (Mono) *
	Frequency Response		140 - 10,000 Hz *
		Amplifier
	Stereo mode		155 W + 155 W (4Ω at 1 kHz, THD 10 %)
	Surround mode		Front: 155 W + 155 W (THD 10 %)
	(* Depending on the sound mode settings
			center*: 155 W
	and the source there may be no sound output.)
			Surround*: 155 W + 155 W (4Ω at 1 kHz THD 10 %)
			Subwoofer*: 225 W (3Ω at 70 Hz THD 10 %)
	Inputs		AUDIO IN, OPTICAL IN, AUX IN
	Outputs		MONITOR OUT HDMI OUT COMPONENT VIDEO OUT
		Speakers
	Front/Rear Speaker	Type	1 Way 1 Speaker
		Impedance	4 Ω
		Frequency Response	120 - 20000 Hz
		Sound Pressure Level	83 dB/W (1m)
		Rated Input Power	155 W
		Max. Input Power	310 W
		Net Dimensions (W x H x D)	117 x 210 x 111 mm
		Net Weight	0.9 kg

1-2 (No.MB672<Rev.002>)

center speaker	Type	1 Way 1 Speaker
	Impedance	4 Ω
	Frequency Response	120 -20000 Hz
	Sound Pressure Level	83 dB/W (1m)
	Rated Input Power	155 W
	Max. Input Power	310 W
	Net Dimensions (W x H x D)	300 x 115 x 111 mm
	Net Weight	1.1 kg
Passive Subwoofer	Type	1 Way 1 Speaker
	Impedance	3 Ω
	Frequency Response	40 - 1500 Hz
	Sound Pressure Level	82 dB/W (1m)
	Rated Input Power	225 W
	Max. Input Power	450 W
	Net Dimensions (W x H x D)	236 x 435 x 391 mm
	Net Weight	5.7 kg
Items with * are measured at Front Speaker Terminals in STEREO mode
Designs and specifications are subject to change without notice.
TH-G40UJ
	General
Power supply	110-240 V ~ 50/60 Hz
Power consumption	130 W
Net Weight	4 kg
External dimensions (W x H x D)	430 x 72 x 307 mm
Operating conditions	Temperature: 5°C to 35°C,Operation status: Horizontal
Operating humidity	5% to 85%
Laser	Semiconductor laser,wavelength 650 nm
	CD/DVD
Video system	NTSC
Frequency response (audio)	140 Hz to 20 kHz*
Signal-to-noise ratio (audio)	More than 75 dB (1 kHz,20 kHz LPF/A-Filter)*
Dynamic range (audio)	More than 75 dB*
Harmonic distortion (audio)	0.5 % (1 kHz,at 1W position) (20 kHz LPF)*
	Video
Video output	1.0 V (p-p),75 Ω,negative sync.,RCA jack x 1
COMPONENT VIDEO OUT	(Y) 1.0 V (p-p),75 ohms,negative sync,RCA jack x 1
	(PB)/(PR) 0.7 V (p-p),75 ohms,RCA jack x 1
HDMI OUT	480p/720p/1080i/1080p
	Tuner (FM)
Tuning Range	87.5 - 108.0 MHz
Intermediate Frequency	10.7 MHz
Signal-to Noise Ratio	60 dB (Mono)*
Frequency Response	140 - 10000 Hz*
	Amplifier

(No.MB672<Rev.002>)1-3

	Surround mode	Front: 155 W + 155 W (THD 10 %)
	(* Depending on the sound mode
		center*: 155 W
	settings and the source
		Surround*: 155 W + 155 W (4Ω at 1 kHz,THD 10 %)
	there may be no sound output.)
		Subwoofer*: 225 W (3Ω at 70 Hz,THD 10 %)
	Inputs	AUDIO IN,OPTICAL IN,AUX IN
	Outputs	MONITOR OUT,HDMI OUT,COMPONENT VIDEO OUT
		Speakers
	Front/Rear Speaker	Type	1 Way 1 Speaker
		Impedance	4 Ω
		Frequency Response	120 - 20000 Hz
		Sound Pressure Level	83 dB/W (1m)
		Rated Input Power	155 W
		Max. Input Power	310 W
		Net Dimensions (W x H x D)	117 x 210 x 111 mm
		Net Weight	0.9 kg
	center speaker	Type	1 Way 1 Speaker
		Impedance	4 Ω
		Frequency Response	120 -20000 Hz
		Sound Pressure Level	83 dB/W (1m)
		Rated Input Power	155 W
		Max. Input Power	310 W
		Net Dimensions (W x H x D)	300 x 115 x 111 mm
		Net Weight	1.1 kg
	Passive Subwoofer	Type	1 Way 1 Speaker
		Impedance	3 Ω
		Frequency Response	40 - 1500 Hz
		Sound Pressure Level	82 dB/W (1m)
		Rated Input Power	225 W
		Max. Input Power	450 W
		Net Dimensions (W x H x D)	236 x 435 x 391 mm
		Net Weight	5.7 kg

Items with * are measured at Front Speaker Terminals in STEREO mode

Designs and specifications are subject to change without notice.

1-4 (No.MB672<Rev.002>)

TH-G30

	General
Power supply		Refer to main label.
Power consumption		Refer to main label.
Net Weight		4 kg
External dimensions (W x H x D)		430 x 72 x 307 mm
Operating conditions		Temperature: 5°C to 35°C Operation status: Horizontal
Operating humidity		5% to 85%
Laser		Semiconductor laser, wavelength 650 nm

		CD/DVD
	Video system		NTSC
	Frequency response (audio)		140 Hz to 20 kHz *
	Signal-to-noise ratio (audio)		More than 75 dB (1 kHz 20 kHz LPF/A-Filter) *
	Dynamic range (audio)		More than 75 dB *
	Harmonic distortion (audio)		0.5 % (1 kHz at 1W position) (20 kHz LPF) *
		Video
	Video output		1.0 V (p-p) 75 Ω negative sync. RCA jack x 1
	COMPONENT VIDEO OUT		(Y) 1.0 V (p-p) 75 ohms negative sync RCA jack x 1
			(PB)/(PR) 0.7 V (p-p) 75 ohms RCA jack x 1
	HDMI OUT		480p/720p/1080i/1080p
		Tuner (FM)
	Tuning Range		87.5 - 108.0 MHz
	Intermediate Frequency		10.7 MHz
	Signal-to Noise Ratio		60 dB (Mono) *
	Frequency Response		140 - 10,000 Hz *
		Amplifier
	Stereo mode		155 W + 155 W (4Ω at 1 kHz, THD 10 %)
	Surround mode		Front: 155 W + 155 W (THD 10 %)
	(* Depending on the sound mode settings
			center*: 155 W
	and the source there may be no sound output.)
			Surround*: 155 W + 155 W (4Ω at 1 kHz THD 10 %)
			Subwoofer*: 225 W (3Ω at 70 Hz THD 10 %)
	Inputs		AUDIO IN, OPTICAL IN, AUX IN
	Outputs		MONITOR OUT HDMI OUT COMPONENT VIDEO OUT
		Speakers
	Front/Rear Speaker	Type	1 Way 1 Speaker
		Impedance	4 Ω
		Frequency Response	120 - 20000 Hz
		Sound Pressure Level	83 dB/W (1m)
		Rated Input Power	155 W
		Max. Input Power	310 W
		Net Dimensions (W x H x D)	117 x 210 x 111 mm
		Net Weight	0.9 kg

(No.MB672<Rev.002>)1-5

center speaker	Type	1 Way 1 Speaker
	Impedance	4 Ω
	Frequency Response	120	-20000 Hz
	Sound Pressure Level	83 dB/W (1m)
	Rated Input Power	155	W
	Max. Input Power	310	W
	Net Dimensions (W x H x D)	300 x 115 x 111 mm
	Net Weight	1.1 kg
Passive Subwoofer	Type	1 Way 1 Speaker
	Impedance	3 Ω
	Frequency Response	40 - 1500 Hz
	Sound Pressure Level	82 dB/W (1m)
	Rated Input Power	225	W
	Max. Input Power	450	W
	Net Dimensions (W x H x D)	236 x 435 x 391 mm
	Net Weight	5.7 kg

Items with * are measured at Front Speaker Terminals in STEREO mode

Designs and specifications are subject to change without notice.

1-6 (No.MB672<Rev.002>)

SECTION 1 PRECAUTION

1.1Safety Precautions

(1)This 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. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

(2)Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture 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 the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

(4)The leads in the products are routed and dressed with ties, clamps, tubings, 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 reassembling.

(5)Leakage shock hazard testing

After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check.

•Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).

•Alternate check method

Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000Ω per volt or more sensitivity in the following manner. Connect a 1,500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor between an exposed metal part and a known good earth ground.

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. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

	AC VOLTMETER
	(Having 1000
	ohms/volts,
	or more sensitivity)
0.15 F AC TYPE
	Place this
	probe on
1500 10W	each exposed
	metal part.

Good earth ground

1.2Warning

(1)This 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.

1.3Caution

Burrs formed during molding may be left over on some parts of the chassis.

Therefore, pay attention to such burrs in the case of preforming repair of this system.

1.4Critical parts for safety

In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.

(This regulation dose not Except the J and C version)

(No.MB672<Rev.002>)1-7

1.5Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.5.1Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be careful to use proper grounding in the area where repairs are being performed.

(1)Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

(2)Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption)

Anti-static wrist strap

1M

Conductive material (conductive sheet) or iron palate

(3)Handling the optical pickup

•In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.

(Refer to the text.)

•Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

1.6Handling the traverse unit (optical pickup)

(1)Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

(2)Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

(3)Handle the flexible cable carefully as it may break when subjected to strong force.

(4)I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.7Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the pickup unit.

•Apply solder to the short land sections before the card wire is disconnected from the connecto on the servo board. (If the card wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

•In the assembly, be sure to remove solder from the short land sections after connecting the card wire.

Solder short land section

1-8 (No.MB672<Rev.002>)

1.8Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not stare into beam.

(Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.

4.CAUTION : This laser product uses visible and/or invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able to function.

6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified here in may result in hazardous radiation exposure.

!

Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

(No.MB672<Rev.002>)1-9

1.9Importance admistering point on the safety

slow blow type / type a fusion lent

	Full Fuse Replacement Marking			Marquage Pour Le Remplacement
				Complet De Fusible
	Graphic symbol mark			Le symbole graphique (Ce symbole signifie
	(This symbol means slow blow type fuse.)
				fusible de type a fusion lent.)
			should be read as follows ;			doit etre interprete comme suit ;
				^
			FUSE CAUTION	PRECAUTIONS SUR LES FUSIBLES
	FOR CONTINUED PROTECTION AGAINST RISK			POUR UNE PROTECTION CONTINUE CONTRE
	OF FIRE, REPLACE ONLY WITH SAME TYPE			DES RISQUES D'INCENDIE, REMPLACER
	AND RATING OF FUSES ;			SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;
			F901 : T12AH 250V			F901 : T12AH 250V

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-10 (No.MB672<Rev.002>)

SECTION 3

DISASSEMBLY

3.1Main body

3.1.1 Removing the Metal cover (See Fig. 1, 2)

(1)Remove the three screws A attaching the Metal cover. (See Fig.1)

(2)Remove the four screws B attaching the both side of the Metal cover. (See Fig.2)

3.1.2 Removing the Front Panel (See Fig. 3 to 6)

(1)Disconnect the card wire from Front panel connected to connector PN103 of the Amp board. (See Fig.3)

(2)From the top side of the Front panel, disengage three

hooks a engaged Front panel. (See Fig.4)

(3) From the both side of the Front panel, disengage two hooks b engaged Front panel. (See Fig.5)

(4)From the bottom side of the Front panel, disengage three hooks c engaged Front panel. (See Fig.6)

A

Fig.1

B

Fig.2

hook a

Fig.4

hook b

Fig.5

PN103

hook c

Fig.6

Fig.3

(No.MB672<Rev.002>)1-11