Jvc TH-G40, TH-G30 Service Manual

SERVICE MANUAL

MB672<Rev.002>20089SERVICE MANUAL

DVD DIGITAL THEATER SYSTEM

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

TH-G30J, TH-G30C

TH-G40

TH-G30

SP-THG50C

SP-THG50C

SP-THG50F SP-THG50F (for Rear)

XV-THG40

SP-THG50F SP-THG50F (for Rear)

XV-THG30

SP-THG50W

SP-THG50W

COPYRIGHT © 2008 Victor Company of Japan, Limited

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

(* Depending on the sound mode settings
and the source there may be no sound output.)

Inputs AUDIO IN, OPTICAL IN, AUX IN
Outputs MONITOR OUT HDMI OUT COMPONENT VIDEO OUT

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

Front: 155 W + 155 W (THD 10 %)
center*: 155 W
Surround*: 155 W + 155 W (4Ω at 1 kHz THD 10 %)
Subwoofer*: 225 W (3Ω at 70 Hz THD 10 %)

Speakers

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
(* Depending on the sound mode
settings and the source
there may be no sound output.)

Inputs AUDIO IN,OPTICAL IN,AUX IN
Outputs MONITOR OUT,HDMI OUT,COMPONENT VIDEO OUT

Front/Rear Speaker Type 1 Way 1 Speaker

center speaker Type 1 Way 1 Speaker

Passive Subwoofer Type 1 Way 1 Speaker

Items with * are measured at Front Speaker Terminals in STEREO mode
Designs and specificat ion s are sub jec t to chan ge witho ut noti ce .

Front: 155 W + 155 W (THD 10 %)
center*: 155 W
Surround*: 155 W + 155 W (4Ω at 1 kHz,THD 10 %)
Subwoofer*: 225 W (3Ω at 70 Hz,THD 10 %)

Speakers

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 Dimensi ons (W x H x D) 117 x 210 x 111 mm
Net Weight 0.9 kg

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 Dimensi ons (W x H x D) 300 x 115 x 111 mm
Net Weight 1.1 kg

Impedance 3 Ω
Frequency Respon se 40 - 1500 Hz
Sound Pressure Level 82 dB/W (1m)
Rated Input Power 225 W
Max. Input Power 450 W
Net Dimensi ons (W x H x D) 236 x 435 x 391 mm
Net Weight 5.7 kg

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, wavelen gth 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 syn c 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

(* Depending on the sound mode settings
and the source there may be no sound output.)

Inputs AUDIO IN, OPTICAL IN, AUX IN
Outputs MONITOR OUT HDMI OUT COMPONENT VIDEO OUT

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

Front: 155 W + 155 W (THD 10 %)
center*: 155 W
Surround*: 155 W + 155 W (4Ω at 1 kHz THD 10 %)
Subwoofer*: 225 W (3Ω at 70 Hz THD 10 %)

Speakers

(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 specificat ion s are sub jec t to chan ge witho ut noti ce .

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

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of this product contains special hardware and

many circuits and com ponen ts sp ecial ly for s afety purp os­es. 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 respo nsibility for pe rsonal 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 vi sual insp ection nor can the
protection afforded by them nec essaril y be obtained by us­ing replacement compon ents rated for higher voltag e, watt­age, etc. Replacement parts which have these special
safety characteristic s ar e identified in the Parts L is t of Ser­vice Manual. Electrical components having such features
are identified by shading on the schemat ics and by ( ) on
the Parts List in the Servic e Manual. The use o f a substitute
replacement which does not have the s am e 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 w ith ties,

clamps, tubings, barrie r s a nd th e li ke 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 reass embling the produc t, always perform an is ola­tion check on the exposed metal parts of the product (an­tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, con trol shaft s, etc.) to be sure th e product
is safe to operate without danger of elect rical 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 Test er", measure the leak age cu rrent
from each exposed metal parts of the cabinet, parti cular­ly any exposed metal part having a return path to the
chassis, to a kn own good earth g round. Any lea kage 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 mann er. C on nec t 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 measu re t he AC volt age acros s
the resis tor. Now, r ever se th e plug in th e AC o utlet 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

Good earth ground

1.2 Warning

(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 provid ed, check setting for local

voltage.

1.3 Caution 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.

1.4 Critical parts for safety

In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB dia gra ms , the pa rts 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)

each exposed
metal part.

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

1.5 Preventing static electricity

Electrostatic disc ha rge (ESD ), wh ic h oc cu rs w he n st ati c el ec tric ity sto red in the body, fabric, e tc. is d is cha rge d, ca n de stroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.5.1 Grounding 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 ch eck the co ndition of th e laser dio de in the op tical pickup . The tester' s interna l power sourc e can easily
destroy th e laser diode.

1.6 Handling 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 nip pers, etc . after replac ing the optic al pickup. For sp ecific det ails, refer to the

replacement procedu re i n the text. Remove the an ti-s tatic pin when repl aci ng the traverse unit. Be careful not to take t oo lon g 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.

1.7 Attention when traverse unit is decomposed *Please refer to "Disassembly method" in the text for the pickup unit.

• Apply solder to the short lan d se cti ons befo re the card wi re is di sc on nec ted from the con ne cto on the s erv o boa rd. (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>)

1.8 Important 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

1.9 Importance admistering point on the safety

slow blow type / type a fusion lent

Full Fuse Replacement Marking

Graphic symbol mark
(This symbol means slow blow type fuse.)

should be read as follows ;

FUSE CAUTION

FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE
AND RATING OF FUSES ;

F901 : T12AH 250V F901 : T12AH 250V

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

Marquage Pour Le Remplacement
Complet De Fusible

Le symbole graphique (Ce symbole signifie
fusible de type a fusion lent.)

^

doit etre interprete comme suit ;

PRECAUTIONS SUR LES FUSIBLES

POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

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

SECTION 3

DISASSEMBLY

3.1 Main 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

(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)

of the Amp board. (See Fig.3)

A

Fig.1

Fig.2

hook

Fig.4

B

a

Fig.3

hook b

Fig.5

PN103

hook c

Fig.6

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