JVC UX-QD7M, UX-QD7W Service Manual

MB334200411

SERVICE MANUAL

MICRO COMPONENT MD SYSTEM

UX-QD7M,UX-QD7W

Area suffix

UB ---------------------- Hong Kong

(SP-UXQD6M)
(SP-UXQD6W)

(CA-UXQD7M)
(CA-UXQD7W)

(SP-UXQD6M)
(SP-UXQD6W)

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-48

COPYRIGHT © 2004 Victor Company of Japan, Limited

No.MB334

2004/11

SPECIFICATION

MD/DVD receiver (CA-UXQD7)

Amplifier Output power 20 W + 20 W at 4 Ω (10% THD)

Input terminals Analog AUX×1,

500 mV/47 kΩ(LEVEL1)
250 mV/47 kΩ(LEVEL2)

Digital Digital optical input × 1

-23 dBm to -15 dBm
(Optical square terminal)
(Compatible with frequency of 32 kHz, 44.1 kHz and 48 kHz)

Output terminals Analog Speaker×1, 20 W/4 Ω

Impedance 4 Ω - 16 Ω
Headphone (×1), 25 mW/32 Ω
Impedance 16 Ω - 1 kΩ

Digital DVD/CD optical input × 1

-23 dBm to -15 dBm
(Optical square terminal)

Other AV COMPU LINK × 2 (Ø 3.5)

Tuner Frequency FM 87.50 MHz - 108.00 MHz

AM 531 kHz - 1 710 kHz (9 kHz spacing)

530 kHz - 1 710 kHz (10 kHz spacing)

DVD player Playable discs DVD VIDEO, DVD AUDIO, CD, VCD, SVCD, CD-R/CDRW (CD, VCD,

SVCD, MP3/ WMA/JPEG format), DVD-R/ DVD-RW (video format)

MD recorder Audio playing system MiniDisc digital audio system

Recording system Magneto-optical overwrite system
Reading system Non-contact, semiconductor laser pickup
Recording/Playback time

(when using an 80-minute
MD)

Sampling frequency 44.1 kHz
Audio compression system ATRAC (Adaptive Transform Acoustic Coding)/ATRAC3 (MDLP)

Cassette
deck

General Power source AC 220 V , 50 Hz

Frequency response Normal (type l) 60 Hz - 14 000 Hz

Power consumption 70 W (at operation) 1.3 W (on standby)

Dimensions 165 mm (W) × 200 mm (H) × 355 mm (D)

Mass (approx.) 5.1 kg

SP 80 minutes
LP2 160 minutes
LP4 320 minutes

Wow and flutter 0.15% (WRMS)

Speaker (SP-UXQD6)

System 3-way bass reflex type, Magnetically shielded type

Speakers Woofer 10 cm × 1

Midrange 4 cm × 1
Tweeter 1.5 cm × 1

Power handling capacity 20 W

Impedance 4 Ω

Frequency range 58 Hz - 40 kHz
Sound pressure level 85 dB/W

Dimensions 135 mm (W) × 200.5 mm (H) × 211.5 mm (D)

Mass (approx.) 2.0 kg (1 unit)

Micro component MD system (UX-QD7)

Dimensions 435 mm (W) × 200.5 mm (H) × 355 mm (D)

Mass (approx.) 9.1 kg

U.S. and foreign patents licensed from Dolby Laboratories.
Design and specifications are subject to change without notice.

1-2 (No.MB334)

·m

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, 1,000
in the following manner. Connect a 1,500
paralleled by a 0.15
exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC

Ω per volt or more sensitivity

Ω 10W resistor

µF AC-type capacitor between an

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.MB334)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.

1-4 (No.MB334)

1.7 Attention when pickup unit is removed

r

1.7.1 Attention when MD pickup unit is removed

*Please refer to "DISASSEMBLY" in the text.

(1) Apply solder to short land section before the flexible wire is disconnected from the connector CN310 on the MD servo control

board.
(If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

(2) In the assembly, be sure to remove solder from the short land section after connecting the flexible wire.

MD servo control board

MD servo control board

CN310

Short land section

Flexible wire

Pickup

(3) Apply solder to short land section before the flexible wire is disconnected from the connector on the pickup.

(If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

(4) In the assembly, be sure to remove solder from the short land section after connecting the flexible wire.

Pickup

Short land section

Flexible wire

1.7.2 Attention when DVD pickup unit is removed

*Please refer to "DISASSEMBLY" in the text.

(1) Apply solder to short land sections before the card wire is disconnected from the connector on the pickup.

(If the card wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

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

Short land sections

Pickup

Card wire

Connecto

(No.MB334)1-5

1.8 Important for laser products

!

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace

the complete Laser Unit if it malfunctions.

4.CAUTION : The CD,MD and DVD player uses 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

WARNING LABEL

CAUTION : Visible and Invisible

laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)

CLASS 1
LASER PRODUCT

ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)

CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)

VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)

VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)

VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)

ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)

VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)

1-6 (No.MB334)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB334)1-7

SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the rear cover
(See Figs.1 and 2)

(1) From the back side of the main body, remove the twelve

screws A attaching the rear cover. (See Fig.1.)

(2) From the bottom side of the main body, remove the three

screws B attaching the rear cover. (See Fig.2.)

(3) Remove the rear cover from the main body.

A

Rear cover

B

A AA

Fig.1

Rear cover

Fig.2

1-8 (No.MB334)

3.1.2 Removing the side panels (L)/(R)

(See Fig.3)

• Remove the rear cover.

(1) From the bottom side of the main body, remove the two

screws C attaching the side panels (L)/(R).

(2) Slide the side panels (L)/(R) in the direction of the arrow

and remove the side panels (L)/(R).

C

Side panel(R)

3.1.3 Removing the top cover assembly

(See Figs.4 and 5)

• Remove the rear cover and side panels(L)/(R).

(1) From the left side of the main body, disconnect the card

wires from the connectors (CN703
board. (See Fig.4.)

(2) Remove the screw D attaching the top cover assembly.

(See Fig.4.)

(3) From the right side of the main body, disconnect the card

wire from the connector CN105
Fig.5.)

(4) Disconnect the wire from the connector CN108 on the main

board. (See Fig.5.)

Reference:

When connecting the wire, pass it through the slot b of
the main board as before. (See Fig.5.)

(5) From the both sides of the main body, remove the two

screws E and screw F attaching the top cover assembly.
(See Figs.4 and 5.)

(6) Release the joints a and remove the top cover assembly.

(See Figs.4 and 5.)

, CN709) on the micon

on the main board. (See

C

E

Side panel(R)

Fig.3

Top cover assembly a

Fig.4

Top cover assembly

a CN108 CN105

ED

Micon boardCN703 CN709

F

b

Main board

Fig.5

(No.MB334)1-9

3.1.4 Removing the front panel assembly
(See Figs.6 to 8)

• Remove the rear cover, side panels(L)/(R) and top cover as-

sembly.
(1) From the left side of the main body, disconnect the card

wires from the connectors (CN702
board. (See Fig.6.)

(2) From the right side of the main body, disconnect the earth

wire from the micon board. (See Fig.6.)

(3) From the both sides and bottom sides of the main body, re-

lease the joints c and joint d. (See Figs.6 to 8.)

(4) Remove the front panel assembly in the direction of the ar-

row. (See Figs.6 to 8.)

, CN710) on the micon

Front panel assembly

CN710

CN702

Micon board

c

Front panel assembly

d

c

Fig.6

Earth wire

Fig.7

Front panel assembly

Micon board

1-10 (No.MB334)

Fig.8

3.1.5 Removing the fan motor

(See Figs.9 and 10)

• Remove the rear cover, side panels(L)/(R) and top cover as-

sembly.
(1) From the back side of the top cover assembly, remove the

screw G attaching the fan motor. (See Fig.9.)

Reference:

When attaching the screws G, attach the spacer with it.
(See Fig.9.)

(2) Take out the fan motor.

Reference:

When attaching the fan motor, pass the wire through the
slot e. (See Fig.10.)

3.1.6 Removing the tuner

(See Figs.9 and 10)

• Remove the rear cover, side panels(L)/(R) and top cover as-

sembly.
(1) From the back side of the top cover assembly, remove the

two screws H attaching the tuner bracket. (See Fig.9.)

(2) From the inside of the top cover assembly, remove the

screw J attaching the tuner bracket. (See Fig.10.)
(3) Take out the tuner with the tuner bracket.
(4) Remove the tuner from the tuner bracket.

Fan motor

Fan motor

G

G

Tuner bracket

H

3.1.7 Removing the cassette mechanism assembly
(See Fig.10)

• Remove the rear cover, side panels(L)/(R) and top cover as-

sembly.
(1) From the inside of the top cover assembly, remove the

screw K, screw L and two screws L’ attaching the cassette
mechanism assembly.

(2) Loosen the screw M attaching the cassette mechanism as-

sembly.

(3) Remove the cassette mechanism assembly.

Reference:

When attaching the screws L’, attach the shield with them.

Spacer

Cassette mechanism assembly

J

Tuner

Fig.9

L'L'

Shield

M

K

e

Fan motor

Tuner bracket

L

Fig.10

(No.MB334)1-11

3.1.8 Removing the heat sink
(See Fig.11)

• Remove the rear cover, side panels(L)/(R) and top cover as-

sembly.
(1) From the back side of the main body, remove the eight

screws N attaching the heat sink.

(2) Remove the heat sink from the main board and regulator

board.

N

Heat sink

N

3.1.9 Removing the main board
(See Figs.12 and 13)

• Remove the rear cover, side panels(L)/(R), top cover assem-

bly and heat sink.
(1) From the forward side of the main board, disconnect the

card wire from the connector CN107

Reference:

Remove it when a lug wire from the main board is in­stalled with a screw P.
(When the screw P and lug wire are installed, apply it.)
(See Fig.12.)

(2) From the right side of the main body, remove the two

screws Q attaching the main board. (See Fig.13.)

(3) Disconnect the connectors (CN101

CN110) on the main board toward this side. (See Fig.13.)

(4) From the forward side of the main board, disconnect the

wires from the connectors (CN109
Fig.13.)

. (See Fig.12.)

to CN104, CN106 and

and CN111). (See

Main board

Main board

Lug wire

CN107

Regulator board

Fig.11

P

Main board

Fig.12

Q

1-12 (No.MB334)

CN104

CN103

CN102

Fig.13

CN111

CN101CN106

CN109

CN110

3.1.10 Removing the regulator board

(See Fig.14)

• Remove the rear cover, side panels(L)/(R), top cover assem-

bly, heat sink and main board.
(1) From the top side of the main body, disconnect the wire

from the connector CN902

(2) Disconnect the wire from the connector CN202

ulator board.
(3) Remove the three screws R attaching the regulator board.
(4) Take out the regulator board from the main body.

Reference:

After attaching the regulator board, attach the barrier as be­fore.

on the transformer board.

on the reg-

Regulator board

CN202

R

Transformer
board

CN902

CN902

Transformer
board

3.1.11 Removing the transformer board
(See Fig.15)

• Remove the rear cover, side panels(L)/(R), top cover assem-

bly, heat sink, main board and regulator board.
(1) From the back side of the main body, remove the two

screws S attaching the heat sink bracket.

(2) From the left side of the main body, remove the tie band.

Reference:

After attaching the transformer board, fix the power cord
with the new tie band as before.

(3) Disconnect the wire from the connector CN903

transformer board.

(4) Disconnect the power cord from the connector CN901 on

the transformer board.

(5) Remove the three screws T attaching the power transform-

er and take out the transformer board from the main body.

Reference:

Remove the transformer shield as required.

on the

R

Transformer shield

Transformer board

CN903

Barrier

Fig.14

CN901

Power cord

Tie band

Heat sink
bracket

S

S

TT

Fig.15

(No.MB334)1-13

3.1.12 Removing the power transformer
(See Fig.16)

• Remove the rear cover, side panels(L)/(R), top cover assem-

bly, heat sink, main board, regulator board and transformer
board.
(1) From the reverse side of the transformer board, remove the

solders from the sections f on the transformer board.

(2) Remove the power transformer from the transformer

board.

3.1.13 Removing the jack board and component board
(See Fig.17)

• Remove the rear cover, side panels(L)/(R), top cover assem-

bly, heat sink, main board and regulator board.
(1) From the back side of the main body, remove the two

screws U attaching the heat sink bracket.

(2) From the top side of the main body, remove the screw V at-

taching the PWB holder and take out the PWB holder.

Reference:

When attaching the PWB holder, put the section g under
the hook of the bottom chassis.

(3) Remove the screw W attaching the jack board and take out

the jack board with the component board.

Reference:

• Remove the connector CN631
from the jack board as required.

• When attaching the jack board, attach it after putting a pro­jection h of the bottom chassis in a hole of the jack board.

on the component board

f

CN631

W

Component board

PWB holder

g

Bottom chassis

V

Fig.16

h

Jack board

Fig.17

Transformer board

Heat sink
bracket

U

U

1-14 (No.MB334)

3.1.14 Removing the joint board
(See Fig.18)

• Remove the rear cover, side panels(L)/(R), top cover assem-

bly, heat sink, main board, regulator board and transformer
board.

Reference:

Remove the jack board as required.
(1) From the back side of the main body, remove the two

screws X attaching the joint board.

(2) Remove the connector CN805

micon board toward this side.

(3) From the forward side of the joint board, disconnect the

card wires from the connectors (CN801
joint board.

(4) Take out the joint board from the main body.

on the joint board from the

to CN804) on the

CN803

CN805

Micon board

3.1.15 Removing the MD mechanism assembly
(See Figs.18 and 20)

• Remove the rear cover, side panels(L)/(R), top cover assem-

bly, front panel assembly, heat sink and main board.
(1) From the back side of the main body, disconnect the card

wire from the connector CN803
Fig.8.)

(2) Remove the screw Y attaching the MD mechanism assem-

bly. (See Fig.19.)

(3) From the right side of the main body, remove the screw Z

attaching the MD mechanism assembly. (See Fig.19.)

Reference:

When attaching the screw Z, attach it with the lug and
shield (C). (See Fig.19.)

(4) From the both sides of the main body, remove the three

screws AA and screw AA’ attaching the MD mechanism
assembly. (See Figs.19 and 20.)

Reference:

When attaching the screw AA’, attach the lug wire with
it. (See Fig.20.)

(5) Take out the MD mechanism assembly from the main

body.

on the joint board. (See

X

MD mechanism assembly

CN804

CN801

AA

CN802

Fig.18

Shield (C)

X

Joint board

Lug wire

Z

MD

Y

holder

Lug wire

AA'

Fig.19

MD mechanism assembly

AA

Fig.20

(No.MB334)1-15