Jvc UX-G68-EV, UX-G68-EN, UX-G68-E Service Manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

MB59520072SERVICE MANUAL

UX-G68E,UX-G68EN,UX-G68EV

CA-UXG68

SUPER VIDEO

COPYRIGHT © 2007 Victor Company of Japan, Limited

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)

SP-UXG68SP-UXG68

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

COPYRIGHT © 2007 Victor Company of Japan, Limited

No.MB595

2007/2

SPECIFICATION

CA-UXG68

Amplifier Output Power 120 W (60 W + 60 W) at 6Ω (10% THD)

Audio Input AUX 500 mV/50 kΩ (at "AUX LVL1")

250 mV/50 kΩ (at "AUX LVL2")
125 mV/50 kΩ (at "AUX LVL3")

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

Digital input USB MEMORY

Video Out Color system PAL (interlaced/progressive)

Composite video 1 V(p-p)/75Ω
S-VIDEO Y (luminance) : 1 V(p-p)/75Ω

RGB 0.7 V(p-p)/75Ω
COMPONENT (Y) : 1 V(p-p)/75Ω

Speaker impedance 6Ω - 16Ω

Tuner FM tuning range 87.50 MHz - 108.00 MHz

AM (MW) tuning range 522 kHz - 1 629 kHz

Disc/file player Playable disc DVD Video/DVD Audio/CD/VCD/SVCD/CD-R/CD-RW

Playable file MP3/WMA/WAV/JPEG/MPEG-1/MPEG-2/ASF/DivX format

Dynamic range 80 dB

Horizontal resolution 500 lines

Wow and flutter Immeasurable

General Power requirement AC 230 V , 50 Hz

Power consumption 125 W (at operation)

Dimensions (approx.) 170 mm × 250 mm × 342 mm (W/H/D)

Mass (approx.) 5 kg

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

(PB/PR) : 0.7 V(p-p)/75Ω

(CD/SVCD/VCD/MP3/WMA/WAV/JPEG/MPEG-1/MPEG-2/ASF/DivX format)
DVD-R/-RW
(DVD-VR/DVD Video/MP3/WMA/WAV/JPEG/MPEG-1/MPEG-2/ASF/DivX format)
+R/+RW
(DVD Video/MP3/WMA/WAV/JPEG/MPEG-1/MPEG-2/ASF/DivX format)
DVD-ROM
(MP3/WMA/WAV/JPEG/MPEG-1/MPEG-2/ASF/DivX format)

13 W (at standby)
1 W (at standby dimmer OFF mode)

SP-UXG68

Speakers Speaker units Tweeter 4 cm cone × 1

Woofer 12 cm cone × 1
Impedance 6Ω
Dimensions (approx.) 145 mm × 250 mm × 195 mm (W/H/D)

Mass (approx.) 2.2 kg each

• Design and specifications are subject to change without notice.

• Manufactured under license from Dolby Laboratories. "Dolby", "Pro Logic", "MLP lossless", and the double-D symbol are trademarks of Dolby
Laboratories.

• DTS and "DTS 2.0+ Digital Out" are trademarks of Digital Theater Systems, Inc.

• Official DivX® Ultra Certified product "Plays all versions of DivX® video (including DivX® 6) with enhanced playback of DivX® media files and the
DivX® Media Format" "DivX, DivX Ultra Certified, and associated logos are trademarks of DivX, Inc. and are used under licence."

• USE OF THIS PRODUCT IN ANY MANNER THAT COMPLIES WITH THE MPEG-4 VISUAL STANDARD IS PROHIBITED, EXCEPT FOR USE
BY A CONSUMER ENGAGING IN PERSONAL AND NON-COMMERCIAL ACTIVITIES.

• This product incorporates copyright protection technology that is protected by U.S. patents and other intellectual property rights. Use of this copy­right protection technology must be authorized by Macrovision, and is intended for home and other limited viewing uses only unless otherwise
authorized by Macrovision. Reverse engineering or disassembly is prohibited.

CONSUMERS SHOULD NOTE THAT NOT ALL HIGH DEFINITION TELEVISION SETS ARE FULLY COMPATIBLE WITH THIS PRODUCT.AND
MAY CAUSE ARTIFACTS TO BE DISPLAYED IN THE PICTURE. IN CASE OF 525 OR 625 PROGRESSIVE SCAN PICTURE PROBLEMS,.IT IS
RECOMMENDED THAT THE USER SWITCH THE CONNECTION TO THE STANDARD DEFINITION" OUTPUT. IF THERE ARE QUESTIONS
REGARDING OUR TV SET COMPATIBILITY WITH THIS MODEL 525p AND 625p DVD PLAYER, PLEASE CONTACT OUR CUSTOMER SER­VICE CENTER."

1-2 (No.MB595)

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.MB595)1-3

1.5 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.

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

1.7 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.

1-4 (No.MB595)

Solder short land section

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.

REPRODUCTION AND POSITION OF LABELS and PRINT

WARNING LABEL and PRINT

(No.MB595)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MB595)

SECTION 3

DISASSEMBLY

3.1 Main body

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

(1) Remove the four screws A (both side) attaching the Metal

cover. (See Fig.1)

(2) Remove the two screws B attaching the Rear cover. (See

Fig.2)

(3) Remove the five screws C attaching the Metal cover. (See

Fig.2)

A

Fig.1

C

B

CC

Fig.2

(No.MB595)1-7

3.1.2 Removing the Front panel assembly
(See Fig.3 to 5)

(1) Disconnect the card wire from the FL board assembly con-

nected to connector CN205 of the Micon board assembly.
(See Fig.3)

(2) Remove the two screws D attaching the Front panel as-

sembly. (See Fig.4)

(3) Disengage the hook a (Fig.4) and hook b (Fig.5) from the

bottom chassis. (See Fig.4, 5)

FL board
assembly

Micon board
assembly

CN205

Fig.3

DD

Hook a

Fig.4

1-8 (No.MB595)

Hook b

Fig.5

3.1.3 Removing the Fan

(See Fig.6, 7)

(1) Disconnect the connector wire from the Fan connected to

connector CN602

(2) Remove the two screws E attaching the Fan. (See Fig.7)

of the Audio board assembly. (See Fig.6)

3.1.4 Removing the Tuner pack

(See Fig.7, 8)

(1) Disconnect the card wire from the Tuner pack connected to

connector CN11

(2) Remove the two screws F attaching the Tuner pack. (See

Fig.7)

of the Micon board assembly. (See Fig.8)

CN602

Fig.6

EF

Fig.7

Tuner pack

CN11

Fig.8

(No.MB595)1-9

3.1.5 Removing the Audio board assembly
(See Fig.9 to 11)

(1) Disconnect the connector wire from the Power transformer

connected to connector CN601 of the Audio board assem­bly. (See Fig.9)

(2) Disconnect the card wire from the USB jack board assem-

bly connected to connector CN811
sembly. (See Fig.9)

(3) Disconnect the card wire from the Audio board assembly

connected to connector CN203
bly. (See Fig.9)

(4) Disconnect the card wire from Micon board assembly con-

nected to connector CN217
(See Fig.9)

(5) Disconnect the card wire from DVD mechanism assembly

connected to connector CN722
bly. (See Fig.9)

(6) Disconnect the card wire from USB jack board assembly

connected to connector CN810
bly. (See Fig.9)

(7) Disconnect the card wire from Micon board assembly con-

nected to connector CN219
assembly. (See Fig.9)

(8) Remove the two screws G attaching the Audio board as-

sembly. (See Fig.9)

(9) Remove the two screws H attaching the Power amplifier

IC. (See Fig.10)

(10) Remove the three screws J attaching the Amplifier board

assembly. (See Fig.11)

and CN220 of the Audio board

of the Audio board as-

of the Micon board assem-

of the Audio board assembly.

of the Audio board assem-

of the Audio board assem-

CN810

G

CN220

CN219

CN203CN217CN722

G

CN811

CN601

Fig.9

H

Fig.10

J

Fig.11

1-10 (No.MB595)

3.1.6 Removing the Micon board assembly

(See Fig.12, 13)

(1) Disconnect the connector wire from Power transformer

connected to connector CN202
bly. (See Fig.12)

(2) Disconnect the card wire from Power trans board assembly

connected to connector CN201
bly. (See Fig.12)

(3) Disconnect the card wire from DVD mechanism assembly

connected to connector CN21
Micon board assembly. (See Fig.12)

(4) Disconnect the card wire from the USB jack board assem-

bly connected to connector CN206
sembly. (See Fig,12)

(5) Remove the two screws K attaching the Micon board as-

sembly. (See Fig.12)

(6) Remove the four screws L attaching the Micon board as-

sembly. (See Fig.13)

of the Micon board assem-

of the Micon board assem-

, CN711 and CN831 of the

of the Micon board as-

CN206

CN711

CN21

K

K

CN831

CN202

CN201

Fig.12

LL

Fig.13

(No.MB595)1-11

3.1.7 Removing the DVD mechanism assembly
(See Fig.14 to 16)

(1) Remove the two screws M (both side) attaching the brack-

et. (See Fig.14)

(2) Disconnect the connector wire from DVD mechanism as-

sembly connected to connector CN803
board assembly. (See Fig.15)

(3) Remove the one screw N attaching the DVD mechanism

assembly. (See Fig.16)

of the USB jack

M

Fig.14

CN803

Fig.15

3.1.8 Removing the USB jack board assembly
(See Fig.17)

(1) Remove the one screw P attaching the USB jack board as-

sembly.

N

Fig.16

1-12 (No.MB595)

P

Fig.17

3.1.9 Removing the Power trans board assembly

(See Fig.18 to 20)

(1) Remove the one screw Q attaching the Power trans board

assembly. (See Fig.18)

(2) Remove the one screw R attaching the Power trans board

assembly. (See Fig.19)

(3) Disconnect the connector wire from Power cord connected

to connector CN101
from Power transformer connected to connector CN102
the Power trans board assembly. (See Fig.20)

and disconnect the connector wire

of

Q

Fig.18

R

CN101

Fig.19

CN102

Fig.20

(No.MB595)1-13

3.1.10 Removing the FL board assembly
(See Fig.21)

(1) Remove the five screws S attaching the FL board assem-

bly.

3.1.11 Removing the Key board assembly
(See Fig.21)

(1) Remove the Volume knob.
(2) Remove the six screws T attaching the Key board assem-

bly.

(3) Disengage the six hooks c engaged Key board assembly.

S

SS

hook c hook c

TT

hook c

Fig.21

1-14 (No.MB595)

3.2 DVD mechanism

3.2.1 Removing the traverse mechanism

(See Fig.1 to 6)

(1) Remove the two screws A attaching the tramecha holder

from top side of DVD mechanism assembly. (See Fig.1)

(2) Remove the two screws B attaching the DVD module

board. (See Fig.2)

(3) Remove the four screws C attaching the CB holder and

take out it. (See Fig.3)

(4) Remove the four screws D attaching the traverse mecha-

nism. (See Fig.4)
(5) Solder the solder part of DVD pick up. (See Fig.5)
(6) Disconnect the card wire from CN101

DVD module board. (See Fig. 6)

Caution:

• Solder the short land section on the DVD pickup before dis-

connecting the card wire from the connector on the DVD
pickup. If the card wire is disconnected without attaching sol­ders, the pickup may be destroyed by static electricity.

• When attaching the DVD pickup, be sure to remove solders

from the short land section after connecting the card wire to
the connector on the DVD pickup.

and CN201 on the

A

Clamper base

B

A

DVD mechanism assembly

Fig.1

DVD mechanism assembly

B

DVD module board

Fig.2

(No.MB595)1-15

DVD module board

Solder short land section

Fig.5

C

C

CC

Fig.3

DVD mechanism assembly

Traverse mechanism assembly

DVD module board

CN101

CN201

Fig.6

DD

Fig.4

1-16 (No.MB595)

3.2.2 Removing the pickup assembly
(See Fig.7 to 11)

(1) Remove the two rod springs pressing the guide shaft. (See

Fig.7)

(2) Remove the screw E and F attaching the spring holder.

(See Fig.8)

(3) Remove the read screw from traverse mechanism assem-

bly. (See Fig.9)

Caution:

When remove the lead screw, do not loss the middle

gear. (See Fig.10 and 11)
(4) Remove the bar spring pressing the shaft. (See Fig.10)
(5) Take out the pickup assembly from traverse mechanism

chassis by order. (See Fig.11)

(SHAFT)

(T.TABLE)

HOOK

(BAR SPRING)

Fig.10

ROD SPRING ROD SPRING

Fig.7

Spring holder

Fig.8

order 2

order 3

order 1

Fig.11

EF

Middle gear

Lead screw

Fig.9

(No.MB595)1-17