JVC UX-P400 User manual

SERVICE MANUAL
COPYRIGHT © 2004 Victor Company of Japan, Limited No.MB262
2004/6
MICRO COMPONENT SYSTEM
MB26220046
UX-P400
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
Area suffix
US ------------------------ Singapore
UF ------------------------------ China
UP ----------------------------- Korea
UT ---------------------------- Taiwan
UW ----------- Brazil,Mexico,Peru
CA-UXP400 SP-UXP400SP-UXP400

1-2 (No.MB262)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier section Output Power 40 W (20 W + 20 W) at 4 Ω(10% THD)
Speakers/Impedance 4 Ω- 16 Ω
Audio Input AUX 400 mV/50 kΩ
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 531 kHz - 1 710 kHz (at 9 kHz intervals)
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
Impedance 4 Ω
Dimensions (approx.) 145 mm ×230 mm ×191 mm (W/H/D)
Mass (approx.) 1.8 kg each
General Power requirement AC 110 V/AC 127 V/AC 220 V/AC 230 V - AC 240 V
(adjustable with the voltage selector), 50 Hz/60 Hz
Power consumption 50 W (at operation)
4.4 W (on standby)
Dimensions (approx.) 170 mm ×230 mm ×311 mm (W/H/D)
Mass (approx.) 4.5 kg

(No.MB262)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.MB262)
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 flexible wire is disconnected from the connecto on the servo board. (If the flexible
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 flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
CD pickup
Short land section
Traverse mechanism assembly CD servo board
CN601
Card wire

(No.MB262)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.
REPRODUCTION AND POSITION OF LABELS
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)
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)
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT
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)
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)
WARNING LABEL

1-6 (No.MB262)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB262)1-7
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the side panels L/R
(See Figs.1 to 4)
(1) From the back side of the main body, remove the four
screws Aattaching the side panels L/R to the rear panel.
(See Fig.1.)
(2) From the bottom side of the main body, remove the two
screws Battaching the side panels L/R to the bottom chas-
sis. (See Fig.2.)
(3) From the both sides of the main body, release the engage-
ment sections (a, b) of the side panels L/R from the top
cover assembly in the direction of the arrow. (See Figs.3
and 4.)
(4) Remove the side panels L/R toward this side.
Fig.1
Fig.2
Fig.3
Fig.4
Side panel R Side panel L
Rear panel
AA
Side panel L
B
B
Bottom chassis
Side panel R
Top cover assembly
a
a
a
Side panel R
Top cover assembly
b
b
b
Side panel L

1-8 (No.MB262)
3.1.2 Removing the front panel assembly
(See Figs.5 to 8)
• Prior to performing the following procedures, remove the side
panels L/R.
(1) From the right side of the main body, push the slide cam
and pull the tray out of the main body in the direction of the
arrow 1. (See Fig.5.)
(2) Remove the tray fitting from the tray in the direction of the
arrow 2. (See Fig.5.)
(3) From the both sides of the main body, remove the two
screws Cattaching the front panel assembly. (See Figs.6
and 7.)
(4) Release the two claws cand claws dto draw out the front
panel assembly in the direction of the arrow. (See Figs.6
and 7.)
(5) From the right side of the main body, disconnect the card
wire from the connector CN730 on the main board. (See
Fig.8.)
(6) Disconnect the wire from the connector CN271 on the main
board. (See Fig.8.)
(7) Remove the front panel assembly in the direction of the ar-
row. (See Fig.8.)
Fig.5
Fig.6
Fig.7
Fig.8
1
2
Front panel assembly
Slide cam
Tray
Tray fitting
Front panel assembly
Cc
d
Front panel assembly
C
c
d
Front panel assembly
CN271
Main board
CN730Card wire
Wire

(No.MB262)1-9
3.1.3 Removing the top cover assembly
(See Figs.9 and 10)
• Prior to performing the following procedures, remove the side
panels L/R and front panel assembly.
(1) From the back side of the main body, remove the screw D
attaching the top cover assembly to the rear panel. (See
Fig.9.)
(2) From the right side of the main body, disconnect the card
wires from the connectors (CN701, CN702) on the main
board. (See Fig.10.)
(3) Take out the top cover assembly from the main body.
Fig.9
Fig.10
Top cover assembly
D
Rear panel
Top cover assembly Card wires
CN702 CN701
Main board

1-10 (No.MB262)
3.1.4 Removing the cassette mechanism assembly
(See Fig.11)
• Prior to performing the following procedures, remove the side
panels L/R, front panel assembly and top cover assembly.
(1) From the bottom side of the top cover assembly, discon-
nect the card wires from the connectors (CN33, CN34) on
the head amp. & mechanism control board.
(2) Remove the four screws Eattaching the cassette mecha-
nism assembly and take out the cassette mechanism as-
sembly from the top cover assembly.
Fig.11
E
CN34 CN33
Cassette mechanism assembly
Head amp. & mechanism control board
Top cover assembly
Card wires
E

(No.MB262)1-11
3.1.5 Removing the tuner
(See Figs.12 and 13)
• Prior to performing the following procedures, remove the side
panel L.
(1) From the back side of the main body, remove the two
screws Fattaching the tuner to the rear panel. (See
Fig.12.)
(2) Disconnect the card wire from the connector CN1 on the
tuner. (See Fig.13.)
Fig.12
Fig.13
F
Rear panel
Card wire
CN1
Tuner

1-12 (No.MB262)
3.1.6 Removing the rear panel
(See Fig.14)
• Prior to performing the following procedures, remove the side
panels L/R.
(1) From the back side of the main body, remove the eight
screws Gattaching the rear panel.
(2) Release the engagement sections eand remove the rear
panel.
(3) Disconnect the wire from the connector CN711 on the main
board.
Reference:
After connecting the wire to the connector CN711, fix the wire
with the wire holder.
3.1.7 Removing the fan
(See Figs.14 and 15)
• Prior to performing the following procedures, remove the side
panels L/R and rear panel.
(1) From the outside of the rear panel, remove the two screws
Hattaching the fan bracket to the rear panel. (See Fig.14.)
(2) From the inside of the rear panel, move the fan bracket in
the direction of the arrow to release the engagement sec-
tions (f, g). (See Fig.15.)
(3) Remove the fan bracket from the rear panel and remove
the fan. (See Fig.15.)
Fig.14
Fig.15
Rear panel
H
G
G
ee
CN711
Wire
holder
Wire
Main board G
fFan bracket
Fan Rear panel
g

(No.MB262)1-13
3.1.8 Removing the main board
(See Fig.16)
• Prior to performing the following procedures, remove the side
panels L/R, front panel assembly, top cover assembly, tuner
and rear panel.
(1) From the right side of the main body, remove the two
screws Jattaching the main board.
(2) Remove the main board toward this side and disconnect
the connector CN200 on the main board.
(3) From the forward side of the main board, disconnect the
card wires from the connectors (CN210, CN221).
Fig.16
3.1.9 Removing the power supply board
(See Fig.17)
• Prior to performing the following procedures, remove the side
panel L and rear panel.
(1) From the left side of the main body, remove the screw Kat-
taching the power supply board.
(2) Remove the power supply board toward this side and dis-
connect the connector CN104 on the power supply board.
(3) From the forward side of the power supply board, discon-
nect the wires from the connectors (CN101, CN102,
CN103, CN105).
Reference:
When attaching the power supply board, insert the section hof
the power supply board in the hole of the bottom chassis be-
fore attaching the screw K.
Fig.17
JJ
CN200 Card wire CN221
Main board
CN210
Power supply board
CN103
CN102
CN101
CN105 CN104
K
h

1-14 (No.MB262)
3.1.10 Removing the power amplifier board
(See Fig.18)
• Prior to performing the following procedures, remove the side
panels L/R, front panel assembly, top cover assembly, tuner,
rear panel, main board and power supply board.
(1) From the top side of the main body, remove the four screws
Lattaching the power amplifier board.
(2) Lift the power amplifier board and remove it from the en-
gagement sections (i, j) of the shield case.
Fig.18
3.1.11 Removing the heat sink
(See Fig.19.)
• Prior to performing the following procedure, remove the side
panels L/R, front panel assembly, top cover assembly, tuner,
rear panel, main board, power supply board and power ampli-
fier board.
(1) From the side of the power amplifier board, remove the two
screws Mattaching the heat sink.
(2) From the side of the power amplifier board, remove the two
screws Nattaching the heat sink.
Fig.19
Power amplifier board
L
L
LL
Shield case
j
i
Heat sink
Power amplifier board N
M M

(No.MB262)1-15
3.1.12 Removing the CD mechanism assembly
(See Figs.20 and 21)
• Prior to performing the following procedures, remove the side
panels L/R, front panel assembly, top cover assembly, tuner,
rear panel, main board and power supply board.
(1) From the top side of the main body, remove the four screws
Pattaching the shield case to the bottom chassis. (See
Fig.20.)
Reference:
When attaching the shield case on the bottom chassis,
align the projections (k, m, n) of the bottom chassis in the
holes of the shield case. (See Fig.20.)
(2) Take out the shield case with the power amplifier board
from the bottom chassis.
(3) Remove the three screws Qattaching the CD mechanism
assembly to the bottom chassis. (See Fig.21.)
Fig.20
Fig.21
Bottom chassis
P
P
P
m
k
n
Shield case
Power amplifier board
CD mechanism assembly
Bottom chassis
Q
Q

1-16 (No.MB262)
3.1.13 Removing the power transformer
(See Figs.22 and 23)
• Prior to performing the following procedures, remove the side
panels L/R, front panel assembly, top cover assembly and rear
panel.
(1) From the forward side of the power supply board, discon-
nect the wires from the connectors (CN102, CN103,
CN105). (See Fig.22.)
Reference:
Remove the power supply board as required. (See
Fig.17.)
(2) From the top side of the main body, remove the four screws
Rattaching the power transformer. (See Fig.23.)
Fig.22
Fig.23
CN102 CN103
Power supply board
CN105
R
R
R
Power transformer

(No.MB262)1-17
3.1.14 Removing the FL board
(See Fig.24)
• Prior to performing the following procedures, remove the side
panels L/R and front panel assembly.
(1) From the inside of the front panel assembly, remove the
four screws Sattaching the FL board.
(2) Take out the FL board from the front panel assembly and
disconnect the card wire from the connector CN751 on the
FL board.
Reference:
When attaching the FL board, align the projections pof the
front panel assembly in the holes of the FL board.
Fig.24
CN751
Card
wire
FL board
p
SS
S
S
p
Front panel assembly

1-18 (No.MB262)
3.1.15 Removing the switch board
(See Figs.25 and 26)
• Prior to performing the following procedures, remove the side
panels L/R and front panel assembly.
(1) From the front side of the front panel assembly, pull out the
mic volume knob. (See Fig.25.)
(2) From the inside of the front panel assembly, remove the
ten screws Tattaching the switch board. (See Fig.26.)
(3) Take out the switch board from the front panel assembly
and disconnect the card wire from the connector CN760 on
the switch board. (See Fig.26.)
Reference:
When attaching the switch board, align the projections qof the
front panel assembly in the holes of the switch board. (See
Fig.26.)
Fig.25
Fig.26
Mic volume knob
Front panel assembly
CN760
Card wire T
q
q
T
T
Switch board

(No.MB262)1-19
3.1.16 Removing the headphone jack board
(See Fig.27)
• Prior to performing the following procedure, remove the side
panels L/R and front panel assembly.
(1) From the inside of the front panel assembly, remove the
screw Uattaching the headphone jack board.
Reference:
After attaching the headphone jack board, fix the wire with the
spacer.
Fig.27
Spacer
Headphone jack board
UFront panel assembly
Wire

1-20 (No.MB262)
3.2 CD mechanism section
• Remove the CD mechanism assembly from the main body.
(See "3.1.12 Removing the CD mechanism assembly".)
3.2.1 Removing the tray assembly
(See Figs.1 to 3)
(1) From the right side of the CD mechanism assembly, push
the slide cam and pull the tray assembly out of the CD
mechanism assembly in the direction of the arrow. (See
Fig.1)
(2) From the top side of the CD mechanism assembly, remove
the two screws Aattaching the leaf spring to the bushing
and remove the leaf spring. (See Fig.2)
(3) Remove the bushing of the tray assembly from the projec-
tion aon the CD mechanism assembly and move the tray
assembly in the direction of the arrow. (See Fig.3)
(4) Remove the claw bof the tray assembly from the CD
mechanism assembly and take out the tray assembly. (See
Fig.3)
Fig.1
Fig.2
Fig.3
3.2.2 Removing the traverse mechanism assembly
(See Figs.4)
(1) From the bottom side of the CD mechanism assembly, re-
move the four screws Battaching the traverse mechanism
assembly.
Tray assembly CD mechanism assembly
Slide cam
Bushing
Leaf spring
A
CD mechanism assembly
Bushing
Claw b
Projection a
Tray assembly
CD mechanism assembly