Jvc UX-P55 Service Manual
SERVICE MANUAL
MICRO COMPONENT SYSTEM
2203620034
UX-P55
COMPACT
DIGITAL AUDIO
CD-R/RW PLAYBACK
STANDBY / ON
DISPLAYDIMMER
AUTO
SOUND
FM MODE
PRESET
MODE
CD
CD
MULTI KEY
CANCEL
PTY
DISPLAY
/EON
MODE
AHB
VOLUME
PRO
RM-SUXP5R REMOTE CONTROL
MICRO COMPONENT SYSTEM UX·P55
STANDBY / ON
STANDBY/ON
SLEEP
MD/AUX
REPEATRANDOMPROG
FM/AM
TAPE
SET
AHB PRO
SOUND
PHONES
DIRECT OPERATING
FUNCTION
CD
/
TAPE
FM/AM
REC
AUTO REVERSE
MD/AUX
CLOCK
VOLUME
TIMER
REV.MODE
REC
SP-UXP55
CA-UXP55 SP-UXP55
Area Suffix
B ----------------------------- U.K.
E --------- Continental Europe
EN ------------ Norther Europe
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.22036
2003/4
SECTION 1
Good earth ground
d
AC VOLTMETER
Important Safety Precautions
1.1 Safety Precautions
(1) This d esign of this product co ntains 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 o f the design or circuitry of the p roduct 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 origin al 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 exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
1-2 (No.22036)
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 0.5µ
mA AC (r.m.s.).
(Having 1000
ohms/volts,
or more sensitivity)
0.15 F AC TYPE
Place this
probe on
1500 10W
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the leg al 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 a re 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 expose
metal part.
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) A ny 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 not e 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 shoul d 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.22036)1-3
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 dio de) in devices such as CD players.
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 sh eet) 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 instal lation, both sides of the laser di ode on the replacement optica l
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 adju sts 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 CD pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the CD servo boar d.
(If the flexible wire is disconnected without applying solder, the CD 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.
1-4 (No.22036)
Flexible wire
Shorting round
Shorting round
CN601 on
mechanism
board
1.9 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 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 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.
!
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 LABEL and PRINT
WARNING LABEL and PRINT
Caution
Label
(No.22036)1-5
SECTION 2
A
A
A
A
Disassembly method
2.1 Main body
2.1.1 Removing the metal cover
(See Fig.1, 2)
(1) Remove the six screws A on the back of the body.
(2) Remove the two screws B on the side of the body.
(3) Pul l both side s of the meta l cover outward and lift the rear
part of the cover.
Metal cover
Metal cover
A
Fig.1
1-6 (No.22036)
B x 2
Fig.2
2.1.2 Removing the rear cover
r
r
(See Fig.3)
• Prior to performing the following procedure, remove the metal
cover.
(1) Remove the two screws C on the back of the body.
2.1.3 Removing the tuner board
(See Fig.4, 5)
• Prior to performing the following procedure, remove the metal
cover.
(1) Disconnect the card wire from connector CN1 on the tuner
board.
(2) Remove the screw D on the right side of the bod y.
(3) Remove the two screws E on the rear panel.
(4) Remove the b and bundling the wire and pull out the wire
through the hole of the CD-R board.
C
Rear panel
E
C
Rear cove
Fig.3
CD-R board
Band
D
Fig.4
CN 1
Tuner board
Rear cove
Rear panel
Fig.5
(No.22036)1-7
2.1.4 Removing the CD-R mechanism assembly
(See Fig.6 ~ 8)
• Prior to performing the following procedure, remove the metal
cover and the rear cover.
(1) Disconne ct the card wires from connector CN903, CN904
and the wire from CN905 on the main board on the upper
side of the body.
(2) Remove the screw D attaching the tuner board and the
CD-R mechanism on the right side of the body.
(3) Remove the two screws F attaching the rear panel and the
CD-R mechanism on the back of the body.
(4) Move the rea r part of the CD-R mechanism assembly up-
wards to disengage the two joints a and release fro m the
rear panel.
Pull the front panel toward the front and move the rear part
of the CD-R mechanism assembly upwards. Then pull out
the CD-R mechanism assembly from the fr on t p a ne l ba ckward.
REFERENCE:
To remove the CD-R mechanism assembly efficiently, disconnect the card wireconnecting the tuner board with the main
board in advance.
Main board
CN905
CN904
CN903
Front panel assembly
Rear panel
Tuner board
Card wires
CD-R mechanism assembly
Fig.6
2.1.5 Remove the rear panel
(See Fig.8 ~ 11)
• Prior to performing the following procedure, remove the metal
cover, rear cover and the CD-R mechanism assembly.
(1) Remove the seven screws G attaching the rear panel.
(2) Di sconnect the card wire from CN902 on the main board.
(3) Di sengage the lower two joints b on each side of the rear
panel using a screwdriver and remove the rear panel backward (The tuner board and the fan will be also detached.Remove them as needed).
2.1.6 Removing the fan
(See Fig.9 ~ 12)
• Prior to performing the following procedure, remove the metal
cover, the rear cover andthe CD-R mechanism assembly.
(1) Disconne ct the wire from connector CN908 on the main
board.
(2) Remove the two screws H on the back of the body.
(3) Move the fan upwards to disengage the four joints c and re-
lease from the rear panel.
CD-R mechanism
assembly
CN 1
Band
Front panel assembly
Fig.7
Tuner board
1-8 (No.22036)
Rear panel
Joint a Joint a
F
G
G
G
Main board
CN908
CN902
Fig.8
Fan
G
Rear panel
Joint c
H
Rear panel
Rear panel
Joint b
Fig.11
Fan
Joint c
H
Rear panel
Joint c
Joint c
Fig.12
Tuner board
Fig.9
Joint b
Fig.10
(No.22036)1-9
2.1.7 Removing the power amplifier board / power amplifier sub board / main board / heat sink
(See Fig.13 ~ 21)
• Prior to performing the following procedure, remove the metal
cover, the rear cover, the CD-R mechanism assembly and the
rear panel.
(1) Disconne ct the card wire from connector CN900, CN901,
CN933 and CN931 on the main board respectively.
(2) Di sconnect the wire from connector CN949, CN950 and
CN951 on the power supply board.
(3) Remove the two screws I on the right side of the body.
(4) Move the boards and heat sink assembly upwards and dis-
engage the joint d and the two joints e to release the power
amplifier board and the main board from the chassis (Refer
toFig.15 , 16).
Move the rear part of the board and heat sink assembly to
the right side.
CAUTION:
The wire extending from the lower side of the main board
is still connected with the body (Refer to Fig.17).
(5) Disco nnect the wire from connector CN906 on the lower
side of the main board (Refer to Fig.18).
2.1.8 Removing the power amplifier board
(See Fig.19 ~ 21)
(1) Disconnect the power amplifier board from connector
CN941 on the power amplifier sub board.
2.1.9 Removing the power amplifier sub board
(See Fig.19 ~ 21)
(1) Disconne ct the two wires from connector CN944, CN9 45,
CN946 and CN947 on the power amplifier sub board.
(2) Remov e the two screws J attaching the power amplifier
sub board and the heat sink.
2.1.10 Removing the main board
(See Fig.19 ~ 21)
(1) Disconnect the wires from connector CN944, CN945,
CN946 and CN947 on the power amplifier sub board.
(2) Remo ve the two screws K attaching the main board and
the heat sink.
REFERENCE:
The power amplifier board, the power amplifier sub board, the
main board and the heat sink can be remove drespectively.
Front panel assembly
CN931
CN901
CN933
CN900
Main board
Main board
CN900
CN933
CN901
CN931
Main board
Power supply board
CN949
CN950
CN951
Front panel assembly
Fig.14
Front panel assembly
II
Joint e
Fig.15
Heat sink
Power supply board
1-10 (No.22036)
CN949 / CN950 / CN951
Fig.13
Power amplifier board
Joint d
Chassis
Fig.16
Main board
Main board
Heat sink
Main board
Power amplifier board
Fig.17
Main board
CN906
Fig.18
Heat sink
K
CN944
CN945
CN947
CN946
Power amplifier sub board
CN941
Fig.20
Main board
Power amplifier board
J
Heat sink
Power amplifier sub board
Fig.19
Heat sink
Power amplifier board
Power amplifier
sub board
Fig.21
Power amplifier board
(No.22036)1-11
2.1.11 Removing the power transformer assembly
(See Fig.22, 23)
• Prior to performing the following procedure, remove the metal
cover, the rear cover, the CD-R mechanism assembly and the
rear panel.
• Remove the assembly consisting of the power amplifier board,
the power amplifier sub board and the main board fromthe
chassis incompletely (Refer to Fig.17).
(1) Remove the cord stopper upwards on the back of the body.
(2) Di sconnect the power cord from connector J1000 on the
board of the power transformer assembly .
(3) Remove the four screws L attaching the power transform-
er assembly.
Power transformer assembly
J1000
Power cord
Cord stopper
Cord stopper
Fig.22
Power cord
J1000
LL
1-12 (No.22036)
Power transformer assembly
Fig.23
2.1.12 Removing the front panel assembly
(See Fig.24, 25)
• Prior to performing the following procedure, remove the metal
cover, the rear cover, the CD-R mechanism assembly and the
rear panel.
• Remove the assembly consisting of the power amplifier board,
the power amplifier sub board and the main board (Refer to
Fig.17, 18).
(1) Remove the two screws M on each lower side of the body.
(2) Disen gage the two joints f on each lowe r side of th e body
using a screwdriver andpull out the front panel assembly
toward the front.
Front panel assembly
Front panel assembly
M
Joint c
Fig.24
Joint c
Fig.25
M
(No.22036)1-13
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