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

3.1.3 Removing the HDMI board (See Fig. 7, 8)

(1) Remove the one screw C attaching t h e HDMI board. ( Se e

Fig.7)

(2) Disconnect the card wire from Main board connected to

connector CN810

(3) Remove the three screws D attaching the HDMI board.

(See Fig.8)

of the HDMI board. (See Fig.8)

C

Fig.7

D

3.1.4 Removing the DVD mechanism (See Fig.9)

(1) Disconnect the card wires from DVD mechanism connect-

ed to connector P400

(2) Remove the four screws E attaching the DVD mechanism.

and P401 of the Main board.

CN810

Fig.8

EE

P400P401

Fig.9

1-12 (No.MB672<Rev.002>)

3.1.5 Removing the Rear panel (See Fig.10, 11)

(1) Disconnect the Power cord from connector PN901

SMPS board. (See Fig.10)

(2) Disconnect the connector wir e from FA N connected to con-

nector PN603

(3) Remove the one screw F and seven screws G attaching

the Rear panel. (See Fig.11)

3.1.6 Removing the Front jack board (See Fig.12)

(1) Disconnect the card wire from Front jack board connected

to connector PN204 of the Main board.

(2) Remove the two screws H attaching the Front jack board.

of the Amp board. (See Fig.10)

of the

PN901

PN603

Fig.10

F

G

Fig.11

H

PN204

Fig.12

(No.MB672<Rev.002>)1-13

3.1.7 Removing the Main board (See Fig.13, 14)

(1) Remove the two screws J attaching the bracket. (See

Fig.13)

(2) Disconnect the connector wire from Main board connected

to connector CN901

(3) Disconnect the card wires from Amp board connected to

connector PN202 and PN203 of the Main board. (See
Fig.14)

(4) Remove the two screws K attaching t h e M ain bo a r d. ( S ee

Fig.14)

of the SMPS board. (See Fig.14)

J

Fig.13

CN901

K

3.1.8 Removing the SMPS board (See Fig.15)

(1) Disconnect the connector wire from Amp board connected

to connector CN602

(2) Remove the five screws L attaching the SMPS board.

of the SMPS board.

PN202

PN203

Fig.14

L

1-14 (No.MB672<Rev.002>)

CN602

Fig.15

3.1.9 Removing the Amp board (See Fig.16)

(1) Remove the four screws M attaching the Amp board.

3.1.10 Removing the Front key board (See Fig.17)

(1) Remove the one screw N attaching the Front key board.

M

Fig.16

N

3.1.11 Removing the FL board (See Fig.18)

(1) Remove the five screws P attaching the FL board.

Fig.17

P

Fig.18

(No.MB672<Rev.002>)1-15

3.2 DVD mechanism

3.2.1 Main base (See Fig.1)

(1) Place the disc clamp assembly as Fig.1.
(2) Lift up the disc clamp assembly i n direction of the a rrow (A).
(3) Separate the disc clamp assembly from the Clamp holder.
(4) Turn the Clamper plate to counterclockwise direction and

then lift up the clamper plate.

3.2.2 Disc tray (See Fig.2)

(1) Insert and push a screwdriver in the emergency eject hole

(A) at the right side, or put the screwdriver on the lever (B)
of the emergency gear and pull the lever (B) in direction of
arrow so that the Disc tray is ejected about 15 ~ 20 mm.

(2) Pull the Disc tray until it is separated from the Main base

completely.

Clamper plate
Magnet clamp

Upper clamp

Disc tray

Main base

Disc clamp assembly

(A)

(Fig. A)

Clamp holder

Main base

Fig.1

Main base

Lever

(B)

Main base

BOTTOM SIDE VIEW

Fig.2

1-16 (No.MB672<Rev.002>)

3.2.3 Slide base assembly (See Fig.3)

(1) Release the four screws (S2).
(2) Disconnect the FFC connector (C1).
(3) Release the screw (S3).

Rubber damper
Distinguish upper and
lower sides
(Assemble with care)

Rubber damper

(S2)

(S3)

(C1)

Reck gear

Spindle motor assembly

Rubber damper

(S2)

General pickup assembly

Fig.3

(S2)

Pickup base

(S2)

(No.MB672<Rev.002>)1-17

3.2.4 Up/Down frame assembly (See Fig.4)

NOTE:

Put the Main base face down (Bottom side)

(1) Release the screw (S4).
(2) Unlock the Locking tab (L3) in direction of arro w and then lift u p the Up/down f rame assembly t o separate it fro m the Main base.

NOTE:

When reassembling move the Up/Down guide in direction of arrow (C) until it is positioned as Fig (C).
When reassembling insert (A) position of the Up/down frame assembl y in the (B) position of the Up/down frame as sembly as Fig (B).

3.2.5 Pulley gear (See Fig.4)

(1) Unlock the locking tab (L4) in direction of arrow (B) and then separate the pulley gear from the main base.

3.2.6 Up/down guide (See Fig.4)

(1) Move the Up/down guide in direction of arrow (A) as Fig (A).
(2) Push the locking tab (L5) down and then lift up the Up/down guide to separate it from the main base.

NOTE:

When reassembling pla ce the Up/ down guide as Fig (C) and m ove it directio n arrow (B) unti l it is lock ed by the lock ing tab (L5). And
confirm the Up/down guide as Fig (A).

3.2.7 Loading board assembly (See Fig.4)

(1) Release one screw (S5).
(2) Unlock the loading motor (C2) from the hook (H1) on the main base.
(3) Unlock two locking tabs (L6) and separate the loading board assembly from the main base.

Up/Down guide

Loading gear

Screw insertion
torque control

Up/Down guide

Pully gear

Loading belt

(A)

(L5)

FIG. (A)

(L4)

Loading board assembly

Main base

(A)

(B)

(C)

(B)

Up/Down guide

FIG. (C)

Fig.4

(S5)

(L3)

(H1)

(C2)

(A)

(B)

FIG. (B)

Up/Down guide

(L6)

(L6)

Main base

(S4)

(S4)

Up/Down frame assembly

1-18 (No.MB672<Rev.002>)

SECTION 4

ADJUSTMENT

This service manual does not describe ADJUSTMENT.

(No.MB672<Rev.002>)1-19

5.1 Power Supply Circuit

Insert power cord.

SECTION 5

TROUBLESHOOTING

YES

Is the Digitron on correctly?

YES

Turn power on.

YES

Is power on?

YES

Does initial read work?

YES

NO

NO

NO

Check power plug and power

supply circuit.

Check power supply circuit.

Check laser circuit.

Check focus circuit.

Check disc.

Does it play?

Does it output

1-20 (No.MB672<Rev.002>)

audio?

OK

NO

Check tracking servo circuit.

YES

NO

Check audio circuit.

YES

5.2 Front circuit

Power on.

YES

Blue LED turn off?

YES

Is the Digitron on

correctly?

YES

Check if all

buttons are ok?

YES

NO

NO

NO

Check if

PN301 is ok?

YES

Check if the front

power is ok?

YES

Check if

DIS301 is ok?

Check if the

power part of the

front is ok?

YES

Check if

R345~R350, R154

ok?

YES

NO

Reconnect it.

NO

Refer to SMPS part.

NO

Check pattern and resoldering

NO

Refer to power(SMPS).

NO

Check if the remote

control is ok?

YES

Front B/D ok.

Refer to MICOM circuit.

NO

Check if the power

part of the front is ok?

Check if the remote

control waveform of PN301

pin11 is ok?

Check if RC2

voltage is ok(5V)?

Resolder or Replace RC2.

Replace R345 ~ R350, R154.

NO

Refer to power(SMPS).

YES

NO

Refer to MICOM circuit.

YES

NO

Check RM circuit

YES

(No.MB672<Rev.002>)1-21

5.3 System operation flow

Power on.

1. Initializes SERVO, DSP & RISC registers.

2. Write RISC code to SDRAM.

3. Reset RISC.

Show LOGO.

YES

Tray closed?

NO

Tray close to closed position.

YES

SLED at inner side?

NO

SLED moves to inner position.

1. Judge whether have disc and disc type.

2. Jump to related disc reading procedure.

Recieve

OPEN/ CLOSE

Key?

NO

1-22 (No.MB672<Rev.002>)

NO

1. Execute Pressed Key & IR Key.

2. System operation routine loop.

1. Stop Playback & Open Tray.

2. Display tray open message & LOGO.

YES

Receive

CLOSE Key?

YES

5.4 AMP Protection

"PROTECTION" appears on the FLD.

After unplug power cord, connect again.

YES

YES

Power on.

YES

"PROTECTION"

appears continuously on the FLD.

YES

Is the IC101 pin54

"LOW" signal(0V)?

YES

Is the Q703, Q704 and Q705 normal?

YES

Replace TI AMP IC(IC701, IC702, IC703, IC704)

NO

OK.

NO

Replace IC101.

NO

Replace the Q703, Q704 and Q705.

(No.MB672<Rev.002>)1-23

5.5 AUDIO Micom Circuit (DVD & AMP)

Power On.

YES

Does

CD/DVD appear at

FLD?

YES

Does

Loading appear

at FLD?

YES

Does

no Disc or Time

appear at FLD?

YES

Check

if DVD an audio

micom insert is

OK.

YES

NO

NO

Does

it appear DVD Error

at FLD?

YES

Check

power part of Main

B/D.

YES

Check

oscillator

X101.

YES

Does AV1,

TV AUDIO, AV1 OPT and

FM 87.5 appear

at FLD.

NO

NO

NO

Refer to SMPS.

NO

Refer to oscillator cir-

cuit.

YESNO

OK

Check Power.

YES

Check DVD Module.

YES

Check SMPS.

NO

Check

if IC101 Pin5

is high.

YES

Check

if IC101 Pin9,36,59 are

high(5V).

YES

Check

if IC101 Pin44

is high.

YES

Replace IC101.

NO

Check IC101 reset

waveform.

NO

Check 5V line.

NO

Check power section

circuit.

1-24 (No.MB672<Rev.002>)

5.6 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

5.6.1 SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL

1) ES8391 main clock is at 27MHz(X501)

1

2) ES8391 reset is high active.

1

IC101

PWR_CTL

DVD_RESET

MRST#

1

2

3

2 1

IC501

3

(No.MB672<Rev.002>)1-25

5.6.2 SDRAM CLOCK

1) ES8391 main clock is at 27MHz(X501)

DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V

1

5.6.3 TRAY OPEN/CLOSE SIGNAL

1) Tray open/close waveform 2) Tray close waveform

1

OPENSW

CLOSESW

CLOSE

3) Tray open waveform

OPEN

OPENSW

CLOSESW

OPEN

CLOSE

1

OPENSW

1

CLOSESW

2

2
3

4

OPEN

CLOSE

3

4

1

1
2

2
3

1-26 (No.MB672<Rev.002>)

4

4
3

5.6.4 SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)

1

2

3

4

1

2

5.6.5 LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)

1

2

3

3

4

1

IC501

2
3

(No.MB672<Rev.002>)1-27

5.6.6 LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)

1

2

1

IC501

3

23

1-28 (No.MB672<Rev.002>)

5.6.7 DISC TYPE JUDGEMENT WAVEFORMS

F+

CD_DVDCT

1

2

F+

CD_DVDCT

3

RF

RF

(DVD)

F+ F+

1

CD_DVDCT

2

CD_DVDCT

1

2

3

(DVD)

1

2

RF

1

(CD)

3

RF

3

(CD)

2

3

IC501

(No.MB672<Rev.002>)1-29

5.6.8 FOCUS ON WAVEFORM S

CD_DVDCT

1

1

FOO
F+

F-

(DVD)

CD_DVDCT

FOO
F+
F-

(DVD)

5.6.9 SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION)

2

3

4

1

2

3

4

2

3
4

IC501

SPINO
SP-

SP+

2

3

1
2

3

1

IC501

1-30 (No.MB672<Rev.002>)

5.6.10 TRACKING CONTROL RELATED SIGNAL(System checking)

CD_DVDCT

TRO

TR-

(DVD)

CD_DVDCT

TRO

TR-

TR+

1

1

2

3

4

IC501

1

2

IC501

2

3

TR+

4

(CD)

4
3

(No.MB672<Rev.002>)1-31

5.6.11 ES8391 VIDEO OUTPUT WAVEFORMS

1) Full colorbar signal(COMPOSIT)

2) Y

1

1

IC501

5.6.12 AUDIO OUTPUT FROM PWM IC

1) Audio related Signal

1

1

1

IC501

IC501

1-32 (No.MB672<Rev.002>)

2

3

5.6.13 DVD & AMP WAVEFORMS

1)

2)

FL+ : TP611 -> R705
FL- : TP612 -> R710

3)

RL+ : TP603 -> R775
RL- : TP604 -> R780

5)

FR+ : TP609 -> R718
FR- : TP610 -> R722

4)

RR+ : TP601 -> R788
RR- : TP602 -> R792

6)

C+ : TP605 -> R731
C- : TP606 -> R736

W+ : TP607 -> R767
W- : TP608 -> R762

4
3

5

6
2

1

(No.MB672<Rev.002>)1-33

Victor Company of Japan, Limited

Audio/Video Systems category 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB672<Rev.002>)

Printed in Japan

VPT