JVC UX-QX3WA User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.MB574
2006/9
MICRO COMPONENT SYSTEM
MB57420069
UX-QX3WA,UX-QX3AA
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
CA-UXQX3W SP-UXQX1W
CA-UXQX3A SP-UXQX1A
SP-UXQX1W
SP-UXQX1A

1-2 (No.MB574)
SPECIFICATION
CD receiver section (CA-UXQX3W/CA-UXQX3A)
Speaker section (SP-UXQX1W/SP-UXQX1A)
Micro component system (UX-QX3W/UX-QX3A)
Design and specifications are subject to change without notice.
Amplifier Output power 20 W ×2ch (THD 10%/4 Ω)
Input terminal LINE IN ×1 LEVEL1 : 500 mV/47 kΩ
LEVEL2 : 250 mV/47 kΩ
LEVEL3 : 125 mV/47 kΩ
Output terminals Speaker ×2 20 W/4 Ω
Impedance : 4 Ω- 16 Ω
Headphones (×1) 25 mW/32 Ω
Impedance : 16 Ω- 1 kΩ
LINE OUT ×1 1 V/47 kΩ
Tuner 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)
General Power requirement AC 240 V , 50 Hz
Power consumption 55 W (at operation)
8 W (Touch illumination ON/QP Link ON)
1.1 W (Touch illumination OFF/QP Link OFF)
Dimensions 165 mm (W) ×204 mm (H) ×339.5 mm (D)
Mass (approx.) 4.1 kg
CD player Playable discs Audio CDs and MP3
System 2-way bass reflex type
Speakers Woofer 11 cm cone speaker ×1
Tweeter 4 cm cone speaker ×1
Power handling capacity 20 W
Impedance 4 Ω
Frequency range 56 Hz - 40 kHz
Sound pressure level 84 dB/W·m
Dimensions 135 mm (W) ×200.5 mm (H) ×215 mm (D)
Mass (approx.) 1.9 kg each
Dimensions 435 mm (W) ×204 mm (H) ×339.5 mm (D)
Mass (approx.) 7.9 kg

(No.MB574)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. 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 per-
formed 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 characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice 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 charac-
teristics 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 reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna 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, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent 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, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W 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 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.).
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 pre-
forming 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)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

1-4 (No.MB574)
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.
(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.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Pickup Connector Card wire
Short land section

(No.MB574)1-5
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.
REPRODUCTION AND POSITION OF LABELS and PRINT
!Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
WARNING LABEL and PRINT

1-6 (No.MB574)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB574)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the rear cover
(See Fig. 1, 2)
(1) Remove the six screws Aattaching the rear cover. (See
Fig. 1)
(2) Remove the three screws Battaching the rear cover from
bottom side of main body. (See Fig. 2)
Fig.1
Fig.2
A
A
ARear cove
r
B

1-8 (No.MB574)
3.1.2 Removing the side panel
(See Fig. 3, 4)
(1) Remove the two screws Cattaching the both side panels.
(See Fig. 3)
(2) Slide to backward and lift up then remove the both side
panels. (See Fig. 4)
Fig.3
Fig.4
Side panel
C
c
hook
Side panel

(No.MB574)1-9
3.1.3 Removing the top cover
(See Fig. 5 to 8)
(1) Remove the one screw Dattaching the tuner bracket. (See
Fig. 5)
(2) Disconnect the card wire from tuner pack connected the
connector CN709 of the micon board. (See Fig. 6)
(3) Disconnect the card wire from touch illumination board
connected the connector CN711 of the micon board, (See
Fig. 6)
(4) Remove the two screws Eattaching the top cover. (See
Fig.6, 7)
(5) Disengage the hook aand bform front panel assembly.
(See Fig. 6, 7)
(6) Lift up the top panel and then, disconnect the connector
wire from fan connected to the connector CN108 of the
power amplifier board. (See Fig. 8)
Fig.5
Fig.6
Fig.7
Fig.8
D
Top cover
CN709
CN711
Micon board
Ea
d
hook
hook
Eb
e
hook
hook
CN108
Power amplifier board

1-10 (No.MB574)
3.1.4 Removing the front panel assembly
(See Fig. 9, 3, 6, 7)
(1) Disconnect the card wires from front panel assembly con-
nected to the connector CN702 and CN710 of the micon
board. (See Fig. 9)
(2) Disengage the hook c, dand efrom the bottom chassis.
(See Fig. 3, 6 and 7)
Fig.9
3.1.5 Removing the heat sink
(See Fig. 10)
(1) Remove the two screws Fattaching the heat sink.
Fig.10
CN710 CN702
F

(No.MB574)1-11
3.1.6 Removing the power amplifier board assembly
(See Fig. 11, 12)
(1) Remove the two screws Gattaching the power amplifier
board assembly. (See Fig. 11)
(2) Disconnect the board to board connectors CN101 connect-
ed to secondary board assembly, CN102 and CN103 con-
nected to micon board assembly. (See Fig. 11)
(3) Disconnect the connector wire from head phone board as-
sembly connected to connector CN109 of the amplifier
board assembly and disconnect the card wire from CD
board connected to connector CN106 of the power amplifi-
er board. (See Fig. 12)
Fig.11
Fig.12
G
CN103 CN102 CN101
Power amplifier board
CN109
CN106
Power amplifier board

1-12 (No.MB574)
3.1.7 Removing the secondary board assembly
(See Fig. 13)
(1) Disconnect the connector wire from primary board assem-
bly connected to connector CN202 of the secondary board.
(2) Remove the two screws Hattaching the secondary board
assembly.
Fig.13
3.1.8 Removing the micon board assembly
(See Fig. 14)
(1) Disconnect the card wire from the CD servo board connect-
ed to connector CN705 of the micon board.
(2) Disconnect the connector wire from primary board assem-
bly connected to connector CN713 of the micon board as-
sembly.
(3) Remove the two screws Jattaching the micon board as-
sembly.
Fig.14
CN202
HH
Secondary board
CN713
CN705
J
J
Micon board

(No.MB574)1-13
3.1.9 Removing the primary board assembly with power transformer
(See Fig. 15)
(1) Remove the three screws Kattaching the primary board
assembly with power transformer.
(2) Slide to direction of the arrow and then take out it.
Fig.15
KK

1-14 (No.MB574)
3.1.10 Removing the CD mechanism assembly
(See Fig.16, 17)
(1) Remove the four screws Lattaching the CD mecha brack-
et. (See Fig. 16)
(2) Disengage the card wire from the CD board assembly en-
gaged to bracket board. (See Fig. 16)
(3) Remove the one screw Mattaching the CD mechanism as-
sembly. (See Fig.17)
Fig.16
Fig.17
LL
M
CD mechanism assembly

(No.MB574)1-15
3.1.11 Removing the Headphone board assembly
(See Fig. 18)
(1) Remove the two screws Nattaching the headphone jack
board assembly.
Fig.18
N
Head phone board

1-16 (No.MB574)
3.1.12 Removing the LCD board assembly
(See Fig. 19)
(1) Remove the three screws Pattaching the LCD board as-
sembly.
3.1.13 Removing the key function board assembly
(See Fig. 19, 20)
(1) Remove the volume knob from front panel assembly.
(2) Remove the one screw Qattaching the key function board
assembly from front side. (See Fig. 20)
(3) Remove the five screws Rattaching the key function board
assembly. (See Fig. 19)
Fig.19
Fig.20
P
RR
R
LCD board
Key function board
Q

(No.MB574)1-17
3.2 CD mechanism assembly
• Remove the CD mechanism assembly from main body.
(Refer to "Disassembly method")
3.2.1 Removing the CD cover
(See fig.1 and 2)
(1) Remove the two screws Aattaching the CD cover from top
side of CD mechanism assembly. (See fig.1)
(2) Remove the card wire from connector CN4 on the LED as-
sembly. (See fig.1)
(3) Take out the CD cover.
Caution:
The spring which presses down a card wire is attached to CD
cover.
Please do not lose a spring. (See fig.2)
Fig.1
Fig.2
CD cover
A
ALED assembly
CN4
Spring
CD cover

1-18 (No.MB574)
3.2.2 Removing the tray assembly
(See fig.3 and 4)
• Remove the CD cover.
(1) From the right-hand side of CD mechanism assembly, a
slide cam is pushed and a tray assembly is pulled out in the
direction of an arrow. (See fig.3)
(2) Remove the two screws Battaching the tray assembly
from top side of CD mechanism. (See fig.4)
(3) Remove the bushing of tray assembly from hook aof CD
mechanism assembly, and then take out the tray assem-
bly. (See fig.4)
Fig.3
Fig.4
Tray assembly CD mechanism assembly
Slide cam
BTray assembly
Hook aHook a

(No.MB574)1-19
3.2.3 Removing the LED assembly
(See fig.5)
• Remove the CD cover and tray assembly.
(1) Remove the double face tape attaching the LED assembly
from top side of tray assembly, and then take out the LED
assembly.
Fig.5
3.2.4 Removing the traverse mechanism assembly
(See fig.6)
• Remove the CD cover.
(1) Remove the four screws Cattaching the traverse mecha-
nism assembly from bottom side of CD mechanism assem-
bly.
(2) Remove the card wire from connector CN602 on CD servo
board, and then take out the traverse mechanism assem-
bly and CD servo board together.
Reference:
When attach the traverse mechanism assembly, the wire
should through part b.
Fig.6
Tray assembly LED assemlbyDouble face tape
CD mechanism assembly
CN602
CD servo board
CC
Traverse mechanism assembly
Slot b

1-20 (No.MB574)
3.2.5 Removing the CD servo board
(See fig.7 and 8)
• Remove the CD cover and traverse mechanism assembly.
(1) Remove the two screws Dattaching the CD servo board
from bottom side of traverse mechanism assembly. (See
fig.7)
(2) Remove the solder from soldered section cof CD servo
board. (See fig.7)
(3) Remove the yellow wire and white wire from soldered sec-
tion dof CD servo board. (See fig.7)
(4) CD servo board is removed upward, hook eis removed in
the direction 1 of an arrow, and CD servo board is turned
over. (See fig.7)
(5) Solder the short land section fof pickup. (See fig.8)
(6) The lock of the connector CN601 of CD servo board is re-
moved in the direction 2 of an arrow, and a card wire is re-
moved. (See fig.8)
Caution:
• Please solder the short land section fof a pickup before re-
moving a card wire from the connector CN601 of CD servo
board. If a card wire is removed without soldering, a pickup
may be destroyed by static electricity. (See fig.8)
• At the time of CD servo board attachment, please remove
the solder of the short land section fof a pickup after attach-
ing a card wire in a connector CN601. (See fig.8)
Fig.7
Fig.8
Travers mechanism assemblyCD servo board
Wire(yellow)
Wire(white)
Soldered section c
Soldered
section d
DD
Hook e
CN601
Hook e
11
Pickup
Short land section f
22
Traverse mechanism assembly
CD servo board
CN601