JVC UX-L40 User manual

1-1
UX-L40/UX-L30
SERVICE MANUAL
MICRO COMPONENT SYSTEM
No.21105
Jul. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
UX-L40/UX-L30
UX-L40/UX-L30
Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
Contents
Flow of functional operation
until TOC read (CD)
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-2
1-3
1-4
1-5
1-19
1-24
1-25
1-25
1-26~35
STANDBY/ON
DISPLAY
CLOCK
/TIMER
SLEEP
BASS
TREBLE
UP
DOWN CANCEL
SET
CD TAPE FM/AM AUX/MD
CD
PRGM RANDOM REPEAT
SURROUND AHB PRO
DIMMER
VOLUME
REV.MODE FM MODE AUTO
PRESET
RM-SUXL40U REMOTE CONTROL
COMPACT
DIGITALAUDIO
CD-R/RW PLAYBACK
REC SURROND AHB PRO
VOLUME
BASS TREBLE
PHONES
AUTO REVERSE
CD TAPE
FM/AM
MICRO COMPONENT SYSTEM UX-L40
CLOCK/TIMER AUX/MD
DOWN UP
STANDBY/ ON
+–
PUSH
OPEN
SP-UXL40 SP-UXL40CA-UXL40 SP-UXL30 SP-UXL30CA-UXL30
STANDBY/ON
DISPLAY
CLOCK
/TIMER
SLEEP
BASS
TREBLE
DOWN CANCEL
SET
CD
PRGM RANDOM REPEAT
AHBPRO
DIMMER
VOLUME
REV.MODE FM MODE AUTO
PRESET
1
4
7
10
2
5
8
3
6
9
+10
RM-SUXL30U REMOTE CONTROL
UP
CD
/
TAPE FM/AM AUX/MD
COMPACT
DIGITALAUDIO
CD-R/RW PLAYBACK
REC REV.MODE AHB PRO
VOLUME
BASS TREBLE
PHONES
AUTO REVERSE
CD TAPE
FM/AM
MICRO COMPONENT SYSTEM UX-L30
CLOCK/TIMER AUX/MD
DOWN UP
STANDBY/ ON
+–
PUSH
OPEN
US ----------------- Singapore
UP ----------------------- Korea
UW ------- Brazil,Mexico,Peru
UJ -------------------- U.S.Military
Area Suffix
UX-L30
US ----------------- Singapore
UP ----------------------- Korea
UW ------- Brazil,Mexico,Peru
Area Suffix
UX-L40

1-2
UX-L40/UX-L30
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 manufacturer`s 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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling 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 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F 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 meausre 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. 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.
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
!
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.
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.
(This regulation does not correspond to J and C version.)

1-3
UX-L40/UX-L30
Preventing static electricity
1.Grounding to prevent damage by 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.
2.About the earth processing for the destruction prevention by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 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.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
3. Handling the optical pickup
1. 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.)
2. 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.
4.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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Attention when traverse unit is decomposed
1.Solder is put up before the card wire is removed from connector on
the CD substrate as shown in Figure.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
2.Please remove solder after connecting the card wire with
when you install picking up in the substrate.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
CN601 on
mechanism
board
Shorting round
Shorting round
Flexible wire

1-4
UX-L40/UX-L30
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 compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. 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 herein may result in
hazardous radiation exposure.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Äläkatso
säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngåutsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

1-5
UX-L40/UX-L30
Remove the six screws Aon the back of the main
body.
Remove the screw Bon each side and remove the
cover in the direction of the arrow.
1.
2.
Disassembly method
<Main body>
Removing the Metal cover
(See Fig.1 to 3)
Fig.1
Fig.2Fig.3
A
A
A
BB

1-6
UX-L40/UX-L30
Remove the metal cover.
Remove the two screws Cretaining the rear cover.
1.
Removing the Rear cover
(See Fig.4)
Remove the metal cover and the rear cover.
Remove the twelve screws Dretaining the rear
panel. Release the two joints aon the rear side and
the joint bon each side.
1.
Removing the Rear panel
(See Fig.5)
Fig.4
Fig.5
CC
D
D
D
DD
D
a
bb

1-7
UX-L40/UX-L30
Remove the metal cover.
Disconnect the card wire from connector CN1 on the
tuner board.
Remove the two screws Eon the rear side and the
screw Fon the side.
1.
2.
Removing the Tuner board
(See Fig.6)
Remove the metal cover.
Disconnect the shield wire from connector CN905 on
the optical digital board.
Remove the screw Gon the rear side and the screw
Hon the upper side.
1.
2.
Removing the Optical digital board
(See Fig.7)
Fig.6
Fig.7
E
F
G
H
CN1
CN905
Tuner board
Optical digital board

1-8
UX-L40/UX-L30
Remove the metal cover, the rear cover, the rear
panel, the tuner board and the optical digital board.
Disconnect the card wire from connector CN903 and
CN904 on the main board.
Pull the joint cin the direction of the arrow and
remove the CD-R/RW mechanism assembly
backward while releasing the joint d.
1.
2.
Removing the CD-R/RW mechanism
assembly (See Fig.8)
Fig.8
cd
CD-R/RW mechanism
assembly
Main board
CN904
CN903

1-9
UX-L40/UX-L30
Remove the metal cover, the rear cover and the rear
panel.
Disconnect the card wire from connector CN902,
CN903, CN904 and CN905 on the main board and
remove the CD-R/RW mechanism assembly.
1.
Removing the Main board/ the Heat sink
board (See Fig.9 to 11)
Remove the two screws Ito remove the main board.
Disconnect the card wire from connector CN931,
CN935, CN933, CN934, CN913, CN901, CN900 and
CN917 on the main board.
Remove the band fand disconnect the card wire
from connector CN951 on the power transformer
assembly. Remove the main board / the heat sink
board from the body.
Release the joint eof the main board and disconnect
connector CN944 and CN945 of the heat sink board
from connector CN915 and CN916 of the main board
respectively.
2.
3.
4.
5.
Refer to the method of removing the
CD-R/RW mechanism assembly and
Fig.8.
REFERENCE:
Fig.9
CN916
CN900
CN901
CN913
CN934
CN933
CN935
CN917
CN951
CN905
CN902 CN904
CD-R/RW mechanism assembly
CN903
CN915
Fig.10Fig.11
CN945
CN944
I
f
I
e
Main board
Main board
Main board
Heat sink board
Heat sink board
Power transformer
assembly
CN931

1-10
UX-L40/UX-L30
Remove the metal cover, the rear cover, the rear
panel, the CD-R/RW mechanism assembly and the
main board.
Disconnect the power cord from connector J1000 on
the power transformer assembly.
Remove the four screws J.
1.
2.
Removing the Power transformer
assembly (See Fig.12)
J
JJ
J1000
Power transformer
assembly
Fig.12

1-11
UX-L40/UX-L30
Remove the metal cover.
Remove the screw Kon each side. Pull the joint h
on both sides and lift the front panel assembly to
release the joint g.
Disconnect connector CN931, CN935, CN933 and
CN934 on the main board.
Disconnect the card wire from connector CN33 and
CN34 on the cassette mechanism board.
1.
2.
3.
Removing the Front panel assembly
(See Fig.13 to 16)
Fig.13
Fig.14
Fig.15Fig.16
K
K
h
hh
g
g
h
g
Main board
Front panel
assembly
Front panel
assembly
CN935 CN931
CN933
CN934
CN34 CN33
Cassette mechanism
board
Cassette mechanism
assembly

1-12
UX-L40/UX-L30
Prior to performing the following procedure, remove
the metal cover and the front panel assembly.
Disconnect connector CN913 on the main board.
1.
Removing the Phones board
(See Fig.17)
Prior to performing the following procedure, remove
the metal cover and the front panel assembly.
Remove the four screws Lretaining the cassette
mechanism assembly.
1.
Removing the Cassette mechanism
assembly (See Fig.18)
Main board
CN913
Phones board
Fig.17
Fig.18
L
L
Cassette mechanism
assembly

1-13
UX-L40/UX-L30
Prior to performing the following procedure, remove
the metal cover and the front panel assembly.
Remove the seven screws Mto remove the control
board.
1.
Removing the Control board
(See Fig.19)
Prior to performing the following procedure, remove
the metal cover and the front panel assembly.
Remove the four screws Nattaching the volume
panel on the front panel assembly.
Remove the six screws Oattaching the volume
board on the volume panel, and remove the volume
board.
1.
2.
Removing the Volume board
(See Fig.20 and 21)
Control board
Fig.19
Fig.20
Fig.21
M
M
NN
OO
Volume board
Volume panel
O

1-14
UX-L40/UX-L30
Remove the two screws Aon the bottom of the
loading base.
Disconnect the card wire from connector CN606 on
the CD servo board. Turn over the CD servo board
as shown in Fig.2 and put aside temporarily.
Solder the shorting round on the pickup board in the
CD pickup section.
Disconnect the card wire from connector CN601 and
the wire from CN801 on the CD servo board.
1.
2.
3.
4.
<CD mechanism assembly section>
Removing the CD servo board
(See Fig.1, 2)
Solder the shorting round before disconnecting
the card wire extending from the pickup. If
you do not follow this instruction, the pickup
may be damaged.
CAUTION:
When reassembling, make sure to unsolder
the shorting round after connecting the card
wire from the pickup to the connector.
CAUTION:
Fig.1
Fig.2
CD servo board
CN801
A
CN606
CN601
CD servo board
CN601
CN801
CD pickup
CD pickup
Pickup board
Shorting round
Shorting round
(Soldering)

1-15
UX-L40/UX-L30
Bring up the fitting in the direction of the arrow to
release the three joints a.
On the front side of the body, move the cam plate
lever to the center.
Remove the stopper screw Band pull out the tray
toward the front.
Remove the four screws Cattaching the clamper
base.
From the rear side, remove the clamper base
upward.
1.
2.
3.
4.
5.
Removing the clamper base / tray
(See Fig.3 ~ 5)
Fig.3
Fig.5
Fig.4
Tray
Tray
Joint a Joint a
Fitting
Clamper Cam plate
(Lever)
Tray
Clamper base
B
C
C
C

1-16
UX-L40/UX-L30
Prior to performing the following procedure, remove
the clamper base / tray and the CD servo board.
Remove the screw Dattaching the CD mechanism
assembly.
Move the CD mechanism assembly backward to
release the two joints bof the CD base on the front
side.
1.
2.
Removing the CD mechanism assembly
(See Fig.6, 7)
When reassembling, fit the front part of the
CD mechanism assembly to the two
chassis joints band attach the four
dampers correctly.
CAUTION:
Fig.6
Fig.7
b
CD mechanism assembly D
damper
damper
damper
damper
CD mechanism assembly
CD base
b
D

1-17
UX-L40/UX-L30
Prior to performing the following procedure, remove
the clamper base / tray and the CD servo board.
From upside of the loading base, remove the belt
from the motor pulley.
Remove the two screws Eattaching the loading
motor.
At the bottom of the body, release the three joints c
outward and pull out the loading motor board from
the shaft. The loading motor comes off with the
loading board.
Unsolder the two soldered points don the loading
motor board and remove the loading motor.
1.
2.
3.
4.
Removing the loading motor / loading
motor board (See Fig.8, 9)
When removing the loading motor board
only, unsolder the two soldering don the
loading motor and release the three joints c.
REFERENCE:
Fig.8
Fig.9
E
E
Loading motor
Motor pulley
Belt
Soldering d
c
c
Loading motor board
Loading motor

1-18
UX-L40/UX-L30
Prior to performing the following procedure, remove
the CD servo board.
Remove the two screws Fattaching the CD base on
the bottom of the loading base.
Remove the rear part of the CD base upward and
pull out the shaft eof the CD base from the camplate
on the front side of the loading base.
1.
2.
Remove the leaf spring on the upside of the loading
base.
Remove the screw Gattaching the cam plate fitting.
Remove the screw Hand the cam plate upward.
Remove the belt from the C.D. gear (1).
Pull out the C.D. gear (1), (2) and (3) respectively.
3.
4.
5.
6.
7.
Removing the C.D. gear (1), (2) and (3)
(See Fig.10 ~ 13)
The CD mechanism assemly comes off
with the CD base.
REFERENCE:
Fig.10
Fig.11
Fig.13Fig.12
(Bottom)
CD base
FF
Loading base
Loading base
CD base
e
CD mechanism assembly F
F
H
Cam plate
G
Cam plate fitting
Spring
C.D. gear (3)
C.D. gear (2) C.D. gear (1)
Belt

1-19
UX-L40/UX-L30
Adjustment method
Measurement Instruments Required for
Adjustment
1. Low frequency oscillator
This oscillator should have a capacity to output
0dBs to 600 at an oscillation frequency of
50Hz-20kHz.
2. Attenuator impedance : 600
3. Electronic voltmeter
4. Distortion meter
5. Frequency counter
6. Wow & flutter meter
7. Test tape
VT703L : Head azimuth
VT712 : Tape speed and running unevenness
(3kHz)
VT724 : Reference level (1kHz)
8. Blank tape
TYPE : AC-225
TYPE : AC-514
9. Torque gauge : For play and back tension
FWD(TW2111A), REV(TW2121a) and
FF/REW(TW2231A)
10. Test disc: CTS-1000
Radio Input signal
AM frequency --------------------------------------- 400Hz
AM modulation ---------------------------------------- 30%
FM frequency --------------------------------------- 400Hz
FM frequency deviation ------------------------ 22.5kHz
Tuner section
FM tuning range: 87.5MHz 108.00MHz
AM tuning range:
At 9kHz intervals: 531kHz 1,710kHz
At 10kHz intervals: 530kHz 1,710kHz
Voltage applied to tuner +B : DC5.7V
VT : DC 12V
Reference measurement
output 26.1mV(0.28V)/3
Input positions AM : Standard loop antenna
FM : TP1 (hot) and TP2 (GND)
Standard measurement position of volume
Function switch to Tape
Beat cut switch to Cut
Super Bass/Active hyper Bass to OFF
Bass Treble to Center
Adjustment of main volume to reference output
VOL : 28
Precautions for measurement
1. Apply 30pF and 33k to the IF sweeper output
side and 0.082 F and 100k in series to the
sweeper input side.
2. The IF sweeper output level should be made as
low as possible within the adjustable range.
3. Since the IF sweeper is a fixed device, there is no
need to adjust this sweeper.
4. Since a ceramic oscillator is used, there is no need
to perform any MIX adjustment.
5. Since a fixed coil is used, there is no need to adjust
the FM tracking.
6. The input and output earth systems are separated.
In case of simultaneously measuring the voltage in
both of the input and output systems with an
electronic voltmeter for two channels, therefore, the
earth should be connected particularly carefully.
7. In the case of BTL connection amp., the minus
terminal of speaker is not for earthing. Therefore, be
sure not to connect any other earth terminal to this
terminal. This system is of an BTL system.
8. For connecting a dummy resistor when measuring
the output, use the wire with a greater code size.
9. Whenever any mixed tape is used, use the band
pass filter (DV-12).
Measurement conditions
Power supply voltage
AC110V/127V/220V/230V 240V , adjustable
Reference output : Speaker : 0.775V/4
: Headphone : 0.077V/32
Reference frequency and
input level ------------------------------ 1kHz, AUX : -8dBs
Measurement output terminal ------- at Speaker J3002
Load resistance --------------------------- 4

1-20
UX-L40/UX-L30
<<Arrangement of Adjusting Position>>
Cassette mechanism section Cassette mechanism section (Back side)
Head azimuth
adjusting screw
(Reverse side)
Head azimuth
adjusting screw
(Forward side)
Playback/Recording &
eraser head
Head azimuth
adjusting screw
(Forward side)
Head azimuth
adjusting screw
(Reverse side)
C202
C376
C103
C121
C106
C305
C108
C109
C107
C308
R203
C302
C203
R109
C206
R104
C209
C113
R209
C207
C301
C310
C303
C304
C208
C331
C313
R116
R204
C316
B106
C319
R103
C375
61
CN31
B158
70u FRE PLA PHO 5V MG SOL RRE TAP NC
110
CN32
91IC31
8 9
IC32
1
16
16
18
9
IC33
L301
Q101
Q201
Q305
Q302
B168
C334
B
Q375
E
Q376
Q371
B
E
C201
R101
R102 C104
R105
R106
R107
R108
C221
R110 R111
R112
R121
R201
R202
C204
R205
R206
R207
R208
C111
R210
R211
R212
R221
R301
R303
R304
B167
R335
R315 R314
R313
R310
R122
Q103
R305
B151
R371
R375
R376
R372
R338 R337
R341
R342
R343
R339
R336
R331
VR31 VR37
C210
C110
C102 C101
Q372
C213
C211
R215
D375
R115
R340
Q331
B113
R345
9
CN33
1
1
CN34
MS
MB
PBR
AG
PBL
SW8V
RECR
AG
RECL
MG
10
R327
C306
R216
C371
B153
B152
B162
C374
R222
B102
B200
B101
Q203
B110
B109B108
B164
B161
B163
R353
B155
C317
C314
L303
R373
B157
B159
B156
B160
B112
C307
B166
Q321
B198
C105
C205
C332 C333
MOTOR SPEED
VR37
BIAS ADJ
VR31
Cassette AMP board