JVC UX-G35US User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.MB536
2006/6
MICRO COMPONENT SYSTEM
MB53620066
UX-G35US,UX-G35UB,UX-G33A,
UX-G33US,UX-G33UB,UX-G33UW,
UX-G30US,UX-G30UB,UX-G30UW
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
CA-UXG35 SP-UXG35SP-UXG35
CA-UXG33 SP-UXG33SP-UXG33
CA-UXG30 SP-UXG30SP-UXG30

1-2 (No.MB536)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier section Output Power 60 W (30 W + 30 W) at 6 Ω(10% THD)
Speakers/Impedance 6 Ω- 16 Ω
Audio Input AUX 500 mV/50 kΩ(at "AUX LVL 1")
250 mV/50 kΩ(at "AUX LVL 2")
125 mV/50 kΩ(at "AUX LVL 3")
Tuner section FM tuning range 531 kHz - 1 710 kHz (at 9 kHz intervals)
AM tuning range 530 kHz - 1 710 kHz (at 10 kHz intervals)
CD player section Dynamic range 88 dB
Signal-to-noise ratio 93 dB
Wow and flutter Immeasurable
Cassette deck section Frequency response Normal (type I): 50 Hz - 14 000 Hz
Wow and flutter 0.15% (WRMS)
Speakers Speaker units 10 cm cone ×1 + 1.5 cm dome ×1
Impedance 6 Ω
Dimensions (approx.) 140 mm ×231 mm ×195 mm (W/H/D)
Mass (approx.) 1.7 kg each
General Power requirement Hong Kong AC 220 V , 50 Hz
Australia AC 240 V , 50 Hz
other AC 110 V/AC 127 V/AC 220 V/AC 230 V - 240 V , 50 Hz/60 Hz
(adjustable with the voltage selector)
Power consumption Hong Kong 50 W (at operation)
9.5 W (on standby/display on)
1.1 W (on standby/display off)
Australia 50 W (at operation)
10 W (on standby/display on)
1.3 W (on standby/display off)
other 60 W (at operation)
14.8 W (on standby/display on)
3.8 W (on standby/display off)
Dimensions (approx.) 165 mm ×231 mm ×328 mm (W/H/D)
Mass (approx.) 4.5 kg

(No.MB536)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 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.).
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.MB536)
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. Replace-
ment 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.

(No.MB536)1-5
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.
(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.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Pickup connector Card wire
Short land section

1-6 (No.MB536)
1.9 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

(No.MB536)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-8 (No.MB536)
SECTION 3
DISASSEMBLY
3.1 Main Body
3.1.1 Removing the side panel
(See Fig.1 to 3)
(1) Remove the one screw Aattaching the rear cover. (See
Fig.1)
(2) Remove the five screws Battaching the side panel and top
cover. (See Fig.1)
(3) Remove the two screws Cattaching the front panel assem-
bly. (See Fig.2)
(4) Slide the both side panels in the direction of the arrow. (See
Fig.3)
Fig.1
Fig.2
Fig.3
B
A
B
C
(both side)

(No.MB536)1-9
3.1.2 Removing the front panel assembly
(See Fig.4)
(1) Remove the two screws Dattaching the front panel and top
cover.
(2) Disconnect the card wire of the switch board from the con-
nector CN401 of the micon board.
(3) Disengage the two hooks athen remove the front panel as-
sembly.
Fig.4
3.1.3 Removing the top cover
(See Fig.5)
(1) Disconnect the card wire from connector CN100.
Fig.5
CN401
aa
D
aa
D
CN100
R
R
R

1-10 (No.MB536)
3.1.4 Removing the tuner pack
(See Fig.6, 7)
(1) Disconnect the card wire of the tuner pack from connector
CN405 of the micon board. (See Fig.6)
(2) Remove the two screws Eattaching the tuner pack. (See
Fig.7)
3.1.5 Removing the micon board
(See Fig.6 to 8)
(1) Remove the two screws Fattaching the micon board. (See
Fig.7)
(2) Disconnect the card wires from connectors CN400, CN406
of the micon board. (See Fig.6)
(3) Disconnect the micon board from the power amplifier board
in the direction of the arrow while releasing the claw b, cof
the connectors CN151, CN152 on the power amplifier
board. (See Fig.8)
(4) Remove the tow screws Gattaching the micon board. (See
Fig.6)
3.1.6 Removing the power amplifier board
(See Fig.7, 8)
(1) Remove the two screws Hattaching the power IC. (See
Fig.7)
(2) Remove the one screw Jattaching the amplifier board.
(See Fig.8)
(3) Disconnect the power amplifier board from the trans board
in the direction of the arrow while releasing the claw dof
the connector CN150 on the power amplifier board. (See
Fig.8)
Fig.6
Fig.7
CN405CN406
CN400
G
E
F
H
L
H
P

(No.MB536)1-11
Fig.8
CN151
power amplifier
board
l
CN152
power amplifier
board
l
CN150
power amplifier
board
l
b
c
J
d

1-12 (No.MB536)
3.1.7 Removing the DVD mechanism assembly
(See Fig.9)
(1) Remove the one screw Kattaching the DVD mechanism
assembly.
Fig.9
3.1.8 Removing the trans board
(See Fig.7, 10, 11)
(1) Remove the two screws Lattaching the trans board. (See
Fig.7)
(2) Disconnect the connector wire from the connector CN900
of the trans board. (See Fig.10)
(3) Remove the one screw Mattaching the trans board. (See
Fig.10)
(4) Remove the three screws Nattaching the power transform-
er. (See Fig.11)
Fig.10
Fig.11
K
CN900 M
N

(No.MB536)1-13
3.1.9 Removing the rear panel
(See Fig.7, 12)
(1) Remove the one screw Pattaching the rear panel. (See
Fig.7)
(2) Disengage the two hooks ethen remove the rear panel.
(See Fig.12)
Fig.12
3.1.10 Removing the jack board
(See Fig.13)
(1) Remove the two screws Qattaching the jack board.
(2) Disengage the tow hooks fthen remove the jack board.
Fig.13
3.1.11 Removing the cassette mechanism assembly
(See Fig.5)
(1) Remove the four screws Rattaching the cassette mecha-
nism assembly.
e
Q
f

1-14 (No.MB536)
3.1.12 Removing the switch board
(See Fig.14, 15)
(1) Take out the volume knob. (See Fig.14)
(2) Remove the six screws Sattaching the switch board. (See
Fig.15)
(3) Disengage the two hooks gthen remove the switch board.
(See Fig.15)
Fig.14
Fig.15
Volume knob
S
S
gg

(No.MB536)1-15
3.2 CD mechanism assembly
• Remove the CD mechanism assembly from main body.
3.2.1 Removing the CD cover
(See Fig.1)
(1) Remove the two screws Aattaching the CD cover from bot-
tom side of CD mechanism assembly.
(2) Lift up the CD cover from disengage boss aof the CD
mechanism assembly.
(3) Slide the CD cover to direction of the arrow and remove the
CD cover from fixing part of b.
(4) Remove the CD cover.
Fig.1
3.2.2 Removing the tray assembly
(See Fig.2 and 3)
• Remove the CD cover.
(1) Press slide cam and pull out the tray assembly to direction
of the arrow from right side of CD mechanism assembly.
(See Fig.2)
(2) Remove the two screws Battaching the tray assembly
from upper side of CD mechanism. (See Fig.3)
(3) Remove the bussing of the tray assembly from boss cof
the CD mechanism assembly and remove the tray assem-
bly. (See Fig.3)
Fig.2
Fig.3
A
ACD cover
CD mechanism assembly
Boss a
Boss a
Fixing part b
Fixing part b
Tray assembly CD mechanism assembly
Slide cam
Bussing
Boss c
Tray assemblyCD mechanism assembly
Boss c
B

1-16 (No.MB536)
3.2.3 Removing the traverse mechanism assembly
(See Fig.4)
(1) Remove the four screws Cattaching the traverse mecha-
nism assembly from bottom side of CD mechanism assem-
bly.
(2) Disconnect the card wire from connector CN602 of the CD
servo board and then take out the traverse mechanism as-
sembly and CD servo board together.
Reference:
When reattaching the traverse mechanism assembly, the card
wire should through the part d.
Fig.4
CD mechanism assembly
CN602
CD servo board
CC
d
Card wire
Traverse mechanism assembly

(No.MB536)1-17
3.2.4 Removing the CD servo board
(See Fig.5 and 6)
• Remove the traverse mechanism assembly.
(1) Remove the two screws Dattaching the CD servo board
from bottom side of traverse mechanism assembly. (See
Fig.5)
(2) Remove the solder from solder part eof the CD servo
board. (See Fig.5)
(3) Remove the yellow wire from solder part fof the CD servo
board. (See Fig.5)
(4) Remove the white wire from solder part hof the CD servo
board. (See Fig.5)
(5) Remove the CD servo board to upper side, disengage the
hook cto direction of the arrow 1 then turn over the CD ser-
vo board. (See Fig.5)
(6) Solder to short land part jof pickup. (See Fig.6)
(7) Release the lock of connector CN601 to direction of the ar-
row 2 and disengage the card wire. (See Fig.6)
Caution:
• Solder to short land part jof the pickup then disconnect the
card wire from connector CN601 of the CD servo board. If
disconnect the card wire before soldering, pickup is make
sure destroyed by static electricity. (See Fig.6)
• When reattaching the CD servo board, connect the card wire
to connector CN601 and then remove the solder of short
land part jof the pickup.
Fig.5
Fig.6
Traverse mechanism assemblyCD servo board
Yellow wire
White wire
Solder part e
Solder
part f
Solder
part g
DD
Hook h
CN601
Hook h
㧝㧝
Pickup
Short land part j
22
Traverse mechanism assembly
CD servo board
CN601

1-18 (No.MB536)
3.2.5 Removing the pickup
(See Fig.7 to 9)
• Remove the traverse mechanism assembly.
(1) Remove the one screw Eattaching the plate from upper
side of traverse mechanism assembly. (See Fig.7)
(2) Remove the plate from fixing part kthen take out the plate.
(See Fig.7)
(3) Remove the two screws Fattaching the LEAD spring and
then take out the LEAD spring. (See Fig.8)
(4) Take out the feed gear, and then remove the shaft of pick-
up from part mof the traverse mechanism assembly. (See
Fig.8)
(5) Remove the pickup from part nof the traverse mechanism
assembly and then take out pickup with shaft. (See Fig.8)
(6) Release the shaft from pickup. (See Fig.8)
(7) Solder the short land part pof the pickup. (See Fig.9)
(8) Release the lock of the connector to direction of the arrow,
and then disconnect the card wire. (See Fig9)
Caution:
• Solder to short land part pof the pickup then disconnect the
card wire from connector. If disconnect the card wire before
soldering, pickup is make sure destroyed by static electricity.
(See Fig.9)
• When reattaching the pickup, connect the card wire to con-
nector and then remove the solder from short land part p.
(See Fig.9)
3.2.6 Attaching the pickup
(See Fig.7 to 10)
• Please refer the "Removing the pickup".
(1) Connect the card wire to connector of pickup, and then re-
move the solder from short land part pof the pickup. (See
Fig.9)
(2) Attach the shaft to pickup. (See Fig.8)
(3) Fit the pickup to part nof the traverse mechanism and then
attach the end of the shaft to part k. (See Fig.8)
(4) Attach the LEAD spring and feed gear. (See Fig.8)
(5) Attach the plate. (See Fig. 7)
(6) One turn the LEAD gear to direction of the arrow 1 and fully
shift to direction of the arrow 2. (See Fig.10)
Fig.7
Fig.8
Fig.9
Fig.10
Plate
E
Fixing part k
Traverse mechanism assembly
F
Part m
Part m
Pickup
Feed gear Shaft LEAD spring
Pickup Connector Card wire
Short land part p
Traverse mechanism assembly
LEAD gear
Pickup
1
2

(No.MB536)1-19
3.2.7 Removing the feed motor
(See Fig.11 to 13)
• Remove the traverse mechanism.
(1) Remove the yellow wire from solder part qof the CD servo
board from upper side of traverse mechanism. (See Fig.11)
(2) Remove the white wire from solder part rof the CD servo
board. (See Fig.11)
(3) Remove the one screw Gattaching the plate. (See Fig.12)
(4) Disengage the plate from fixing part s and take out the
plate. (See Fig.12)
(5) Remove the feed gear and take out the feed motor. (See
Fig13)
Reference:
When attaching the feed motor, the wire has to through the
part tof the traverse mechanism assembly. (See Fig.13)
Fig.11
Fig.12
Fig.13
Traverse mechanism assemblyCD servo board
Yellow wire
White wire
Soldered part q
Soldered part r
Plate
G
Fixing part s
Traverse mechanism assembly
Traverse mechanism assembly
Feed gear Feed motor part t

1-20 (No.MB536)
3.2.8 Removing the switch board
(See Fig.14)
(1) Disconnect the card wire from CN1 of the switch board
from bottom side of CD mechanism assembly.
(2) Remove the wire from solder part uof the switch board.
(3) Remove the one screw Hattaching the switch board to CD
mechanism assembly.
(4) Lift up the switch board by pushing the hook vof CD mech-
anism assembly and take out it from part w.
Reference:
• After attach the switch board to CD mechanism assembly,
wire hooked to part x.
•Hookuof the CD mechanism assembly, it have to bond
lock.
3.2.9 Removing the motor
(See Fig.14 and 15)
• Remove the tray assembly.
(1) Remove the wire from solder part u of the switch board
from bottom side of CD mechanism assembly.
(2) Remove the belt of motor pulley from upper side of CD
mechanism assembly. (See Fig.15)
Caution:
Belt should not apply grease.
(3) Remove the two screws Jattaching the motor to CD mech-
anism assembly and take out the motor from bottom side
of CD mechanism assembly. (See Fig.15)
Reference:
After motor attached to CD mechanism assembly, wire should
hook to part w. (See Fog.14)
Fig.14
Fig.15
Switch board Wire
Solder
part u
Hook v
Part w
CN1
CD mechanism assembly
HPart w
CD mechanism assembly
J
Belt
Motor pulley