JVC UX-G70-1 Schematic

SERVICE MANUAL

MICRO COMPONENT SYSTEM

MB50520066

UX-G70J,UX-G70C,UX-G70B,

UX-G70E,UX-G70EN,

UX-G70EV,UX-G70EE

CA-UXG70

SUPER VIDEO

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

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37

COPYRIGHT © 2006 Victor Company of Japan, Limited

SP-UXG70SP-UXG70

No.MB505

2006/6

SPECIFICATION

Amplifier section Output Power Northern america 120 W per channel, min. RMS, driven into 6 Ω at 1kHz with no more than 10% total

harmonic distortion. (for northern america)

Europe 160 W (80 W+80 W) at 6

Audio Input LINE IN 500 mV/49 k

250 mV/49 k
125 mV/49 k

GAME IN (northern america) 500 mV/49 k

TV SOUND IN 500 mV/49 kΩ

Audio Output LINE OUT 1.0 Vrms (3 kΩ) (at "L.OUT LVL1")

SUBWOOFER OUT 260 mVrms/3.9 k

HEADPHONES OUT 17 mW/32 Ω

Digital output DVD OPTICAL DIGITAL OUT -21 dBm to -15 dBm (660 nm ±30 nm)

USB input USB AUDIO

Video Output Color system NTSC (interlaced/progressive) for northern america

VIDEO (composite) 1 V(p-p)/75

S-VIDEO Y (luminance) : 1 V(p-p)/75 Ω

RGB 0.7 V(p-p)/75

COMPONENT (Y) : 1 V(p-p)/75

Speaker impedance 6

Headphone impedance 16 Ω - 1 kΩ

Tuner section FM tuning range 87.5 MHz - 108.0 MHz

AM tuning range 530 kHz - 1 710 kHz for northern america

Disc player section Playable disc DVD Video/DVD Audio/CD/VCD/SVCD

Dynamic range 80 dB

Horizontal resolution 500 lines

Wow and flutter Immeasurable

General Power requirement AC 120 V , 60 Hz for northern america

Power consumption 90 W (at operation) for northern america

Dimensions (approx.)(W/H/D) 175 mm

Speakers Speaker units Tweeter 1.5 cm (5/8 inch) dome

Squawker 4 cm (1-5/8 inch) cone

Woofer 13.5 cm (5-3/8 inch) cone

Impedance 6

Dimensions (approx.) (W/H/D) 166 mm × 250 mm × 232 mm (6-9/16 inch × 9-7/8 inch × 9-3/16 inch)

Mass (approx.) 2.8 kg (6.2 lbs) each

500 mVrms (1.5 k

PAL (interlaced/progressive) for europe

C (chrominance, burst) : 0.286 V(p-p)/75 Ω for northern america

C (chrominance, burst) : 0.3 V(p-p)/75

(PB/PR) : 0.75 V(p-p)/75 Ω for northern america

(PB/PR) : 0.7 V(p-p)/75

Ω - 16 Ω

522 kHz - 1 629 kHz fro europe

CD-R/CD-RW (CD/SVCD/VCD/MP3/WMA/JPEG format)
DVD-R/-RW (DVD-VR/DVD Video/MP3/WMA/JPEG format)
+R/+RW (DVD Video format)
DVD-ROM (DVD Video format)

AC 230 V , 50 Hz for europe

95 W (at operation) for europe
14 W (at standby)

1.0 W (at standby display OFF mode)

Ω

Ω (at "L.IN LVL1")
Ω (at "L.IN LVL2")
Ω (at "L.IN LVL3")

Ω

Ω

Ω for europe

Ω

× 250 mm × 411 mm (6-9/10 inch × 9-7/8 inch × 16-1/5 inch)

Ω (10% THD) for europe

Ω) (at "L.OUT LVL2")

Ω

Ω for europe

Ω for europe

× 1

× 1

× 1

Design and specifications are subject to change without notice.

1-2 (No.MB505)

SECTION 1

PRECAUTION

1.1 Safety 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 ex-

posed 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

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 provided, 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 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)

each exposed
metal part.

(No.MB505)1-3

1.5 Safety Precautions (U.K only)

(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-

tinued 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.

(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot

accept responsibility for personal injury or property damage resulting therefrom.

(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never

be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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 re-assembling.

1.5.1 Warning

(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.

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 (No.MB505)

1.6 Preventing 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.

1.6.1 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 check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.

1.7 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 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.

1.8 Attention 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.

Short land section

Connector

Card wire

DVD pickup

DVD changer mechanism assembly

(No.MB505)1-5

1.9 Importance administering point on the safety

D9044

D9047

D9043

Q9044

IC901

B9105

D9048

C9041

B9301

B9302

B9300

B9104

HS902

C9045

B9106

D9040

B9501

B9600

B9502

D9025

B9202

D9024

D9023

C9022

CN901

HS901

R9046

R9045

C9042

D9042

R9044

FT913

D9004

D9003

C9003

C9024

B9204

C9004

C9023

C9025

C9021

D9022

D9014

D9021

B9900

D9046

D9045

Q9043

FT914

B9203

D9002

D9001

C9005

C9014

D9012

D9011

D9013

B9303

B9205

C9012

R9031

D9031

B9101

RY901

B9102

B9103

C9043

C9044

C9002

FT907

C9001

FT905

C9015

FT909

C9011

FT911

C9013

R9033

R9032

D9032

Q9031

C9031

T9000

FT908

FT906

FT910

FT912

CN903

B9100

B9700

LF901

FT903

FT904

C9052

C9051

B9305

B9304

CN906

R9050

EP901

B9201

B9200

CN904

FT901

FT902

B9500

B9950

CN905

S9001

Full Fuse Replacement Marking

Graphic symbol mark
(This symbol means fast 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 ;

F9001 : 6.3A 125V
F9002 : 6.3A 125V
F9003 : 3.15A 125V
F9004 : 3.15A 125V
F9006 : 2.5A 125V

Marquage Pour Le Remplacement
Complet De Fusible

Le symbole graphique (Ce symbole signifie

fusible de type a fusion rapide.)

^

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 ;

F9001 : 6.3A 125V
F9002 : 6.3A 125V
F9003 : 3.15A 125V
F9004 : 3.15A 125V
F9006 : 2.5A 125V

1-6 (No.MB505)

1.10 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.

REPRODUCTION AND POSITION OF LABELS and PRINT

WARNING LABEL and PRINT

(No.MB505)1-7

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-8 (No.MB505)

SECTION 3

A

DISASSEMBLY

3.1 Main body

3.1.1 Removing the side panel

(Fig.1, 2)

(1) Remove the six screws A attaching the side panel. (See

Fig.1)

(2) Remove the four screws B attaching the side panel. (See

Fig.2)

3.1.2 Removing the top cover

(Fig.1, 3)

(1) Remove the one screw C attaching the top cover. (See

Fig.1)

(2) Remove the two screws D attaching the top cover. (See

Fig.3)

C G

B

G

Fig.1

B

Fig.2

D

A

Fig.3

(No.MB505)1-9

3.1.3 Removing the front panel
(Fig.4 to 6)

(1) Disconnect the card wire from the connector CN359

on the regulator board. (See the Fig.4)

CN360

(2) Disconnect the card wire from the connector CN760 on the

main board. (See Fig.4)

(3) Disconnect the connector wire from the connector CN713

on the main board. (See Fig.4)

(4) Disconnect the connector wire from the connector CN405

on the video board. (See Fig.4)

(5) Remove the two screws E and two screws F attaching the

front panel. (See Fig.5)
(6) Remove the hook a. (See Fig.5)
(7) Remove the hook b and then removing the front panel.

(See Fig.6)

and

CN360

E

CN359

Fig.4

CN706CN713CN405

Fig.5

hook b

hook a

F

3.1.4 Removing the rear cover
(Fig.1)

(1) Remove the two screws G attaching the rear cover.

1-10 (No.MB505)

Fig.6

3.1.5 Removing the video board

(Fig.7, 8)

(1) Disconnect the card wire from the connector CN401

on the video board. (See Fig.7)

CN402

(2) Remove the three screws H attaching the video board.

(See Fig.8)

3.1.6 Removing the tuner pack

(Fig.8, 9)

(1) Disconnect the card wire from the connector CN712

main board. (See Fig.9)

(2) Remove the two screws J attaching the tuner pack. (See

Fig.8)

3.1.7 Removing the fan

(Fig.8, 9)

(1) Disconnect the connector wire from the connector CN708

on the main board. (See Fig.9)

(2) Remove the two screws K attaching the fan. (See Fig.8)

on the

and

CN401

CN402

Fig.7

H

J

H

CN712

K

Fig.8

CN708

Fig.9

(No.MB505)1-11

3.1.8 Removing the rear panel
(Fig.10, 11)

(1) Remove the eight screws L attaching the rear panel. (See

Fig.10)

(2) Remove the rear panel from the hook c. (See Fig.11)

L

L

L

L

Fig.10

1-12 (No.MB505)

hook c

Fig.11