JVC UX-G38B, UX-G38E, UX-G39E, UX-G39EN, UX-G37B Service Manual
...
SERVICE MANUAL
MICRO COMPONENT SYSTEM
MB61120075SERVICE MANUAL
UX-G38B,UX-G38E,UX-G38EN,UX-G38EV,
UX-G39E,UX-G39EN,UX-G39EV,UX-G37B,
UX-G37E,UX-G37EN,UX-G37EV
SP-UXG38
SP-UXG38
SP-UXG39
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)
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
COPYRIGHT © 2007 Victor Company of Japan, Limited
CA-UXG37
CA-UXG38
CA-UXG39
UX-G39 is derivertive model and different color model of UX-G38.
UX-G37 is different color model of UX-G38.
SP-UXG38
SP-UXG38
SP-UXG39
TABLE OF CONTENTS
No.MB611
2007/5
SPECIFICATION
Amplifier section OUTPUT POWER 40 W (20 W + 20 W) at 6 Ω (10% THD)
Speakers/Impedance 500 mV/47 kΩ (at "LINE IN LVL1")
Audio input LINE IN 250 mV/47 kΩ (at "LINE IN LVL2")
125 mV/47 kΩ (at "LINE IN LVL3")
Audio output LINE OUT 1.0 Vrms (47 kΩ) (at "LINE OUT LVL1")
2.0 Vrms (47 kΩ) (at "LINE OUT LVL2")
Digital input USB MEMORY
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 522 kHz - 1 629 kHz
CD player section Dynamic range 88 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
USB storage USB specification Compatible with USB 2.0 Full Speed
Compatible device Mass storage class
Compatible file system FAT16, FAT32
Bus power supply Max. 500 mA
Speakers Speaker units 10 cm cone × 1
Impedance 6 Ω
Dimensions (approx.) 145 mm × 251 mm × 162 mm (W/H/D)
Mass (approx.) 1.6 kg each
General Power requirements AC 230 V , 50 Hz
Power supply to USB mass storage class device 5 V/500 mA
Power consumption 22 W (power on)
3.0 W (standby mode)
1.5 W or less (Save Mode)
Dimensions (W × H × D) 175 mm × 251 mm × 247 mm
Mass 2.6 kg
Specifications and appearance are subject to change without prior notice.
1-2 (No.MB611)
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.MB611)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.MB611)
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
Pickup connector Card wire
(No.MB611)1-5
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.
!
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
1-6 (No.MB611)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB611)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the Metal cover
(See Fig.1, 2)
(1) Remove the six screws A attaching the metal cover. (See
Fig.1)
(2) Remove the two screws B attaching the both side of metal
cover. (See Fig.2)
AA
Fig.1
B
Fig.2
1-8 (No.MB611)
3.1.2 Removing the Front panel assembly
(See Fig.3 to 5)
(1) Disconnect the card wire from front panel assembly con-
nected to connector CN432
(See Fig.3)
(2) Remove the two screws C attaching the Front panel as-
sembly. (See Fig.4)
(3) Disengage the hook a engaged Front panel assembly.
(See Fig.4)
(4) Disengage the hook b engaged both side of Front panel
assembly. (See Fig.5)
of the Main board assembly.
CN432
Fig.3
CC
hook a
Fig.4
hook b
Fig.5
(No.MB611)1-9
3.1.3 Removing the Tuner pack
(See Fig.6, 7)
(1) Disconnect the card wire from Tuner pack connected to
connector CN911 of the Main board assembly. (See Fig.6)
(2) Remove the two screws D attaching the Tuner pack. (See
Fig.7)
CN911
Fig.6
D
3.1.4 Removing the Rear Panel
(See Fig.8, 9)
(1) Remove the two screws E attaching the Speaker terminal.
(See Fig.8)
(2) Remove the two screws F attaching the Power board as-
sembly. (See Fig.8)
(3) Disengage the hook c engaged both side of Rear panel.
(See Fig.9)
Fig.7
E
FF
Fig.8
1-10 (No.MB611)
hook c
Fig.9
3.1.5 Removing the Main board assembly
(See Fig.10)
(1) Remove the one screw G attaching the Main board assem-
bly.
(2) Disconnect the connector CN373
Main board assembly and Power board assembly.
(3) Disconnect the connector CN401
assembly and Jack boaed assembly.
(4) Disconnect the connector wire from CD mechanism as-
sembly connected to connector CN708
assembly.
3.1.6 Removing the Power board assembly
(See Fig.11)
(1) Disconnect the card wire from DVD mechanism assembly
connected to connector CN701
bly.
(2) Remove the two screws H attaching the Power board as-
sembly.
(3) The slide is done, and it pulls and it raises it in the direction
of the arrow.
and CN709 connected
connected Main board
of the Main board
of the Power board assem-
CN709 CN373
CN708
CN401
Fig.10
H
G
H
CN701
Fig.11
(No.MB611)1-11
3.1.7 Removing the CD mechanism assembly
(See Fig.12, 13)
(1) Remove the one screw J attaching the CD mechanism as-
sembly. (See Fig.12)
(2) Turnover the CD mechanism, disconnect the connector
wire from CD mechanism assembly connected to connector CN104
of the Jack board assembly. (See Fig.13)
J
Fig.12
CN104
3.1.8 Removing the Front board assembly
(See Fig.14)
(1) Remove the volume knob.
(2) Remove the eleven screws K attaching the Front board as-
sembly.
K
Fig.13
K
Fig.14
1-12 (No.MB611)
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 A attaching the CD cover from bot-
tom side of CD mechanism assembly.
(2) Lift up the CD cover from disengage boss a of 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.
Boss a
A
Fixing part b
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 B attaching the tray assembly
from upper side of CD mechanism. (See Fig.3)
(3) Remove the bussing of the tray assembly from boss c of
the CD mechanism assembly and remove the tray assembly. (See Fig.3)
Fig.1
Fig.2
Boss
CD cover
c
Bussing
Boss a
A
CD mechanism assembly
Tray assembly CD mechanism assembly
Slide cam
Boss c
B
Fixing part b
Tray assemblyCD mechanism assembly
Fig.3
(No.MB611)1-13
3.2.3 Removing the traverse mechanism assembly
(See Fig.4)
(1) Remove the four screws C attaching the traverse mecha-
nism assembly from bottom side of CD mechanism assembly.
(2) Disconnect the card wire from connector CN602
servo board and then take out the traverse mechanism assembly and CD servo board together.
Reference:
When reattaching the traverse mechanism assembly, the card
wire should through the part d.
of the CD
Card wire
d
CD mechanism assembly
CD servo board
C
Traverse mechanism assembly
Fig.4
C
CN602
1-14 (No.MB611)
3.2.4 Removing the CD servo board
(See Fig.5 and 6)
• Remove the traverse mechanism assembly.
(1) Remove the two screws D attaching the CD servo board
from bottom side of traverse mechanism assembly. (See
Fig.5)
(2) Remove the solder from solder part e of the CD servo
board. (See Fig.5)
(3) Remove the yellow wire from solder part f of the CD servo
board. (See Fig.5)
(4) Remove the white wire from solder part h of the CD servo
board. (See Fig.5)
(5) Remove the CD servo board to upper side, disengage the
hook c to direction of the arrow 1 then turn over the CD ser-
vo board. (See Fig.5)
(6) Solder to short land part j of pickup. (See Fig.6)
(7) Release the lock of connector CN601
row 2 and disengage the card wire. (See Fig.6)
Caution:
• Solder to short land part j of the pickup then disconnect the
card wire from connector CN601
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
land part j of the pickup.
and then remove the solder of short
to direction of the ar-
of the CD servo board. If
CN601
Hook h
Solder part e
Yellow wire
DD
White wire
Solder
part f
Solder
㧝㧝
Traverse mechanism assemblyCD servo board
Fig.5
CD servo board
part g
Hook h
Pickup
Short land part j
CN601
22
Traverse mechanism assembly
Fig.6
(No.MB611)1-15
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