JVC UXH-9 Service manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

MB10720041

UX-H9

TIMER

TIMER SET

STANDBY/ON

ON/OFF

INTRO

RDS SEARCH

RANDOM SLEEP

/

REMAIN

/RDS MODE

TUNER

TAPE CD

/BAND

BEAT CUT

DISPLAY

/CLOCK SET

SOUND

MUTING

/BASS

REPEAT
ST/MONOPROGRAM

CD

VOLUME

STANDBY/ON

STANDBY

MICRO COMPONENT SYSTEM

UX-H9

VOLUME

RM-SUXH9R REMOTE CONTROL

CD SYNCHRO RECORDING

OPEN

Area Suffix

E ------ Continental Europe
EN ------ Noerthern Europe

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED

No.MB107

2004/1

SPECIFICATION

Amplifier Section
CA-UXH9

Tuner FM tuning range 87.50 MHz-108.00 MHz

CD player Dynamic range 60 dB

Cassette deck Frequency response Normal (type I):100 Hz-10 000 Hz

General Power requirement AC 230 V , 50 Hz

Speaker Section
SP-UXH9

Output Power (IEC 268-3) 10 W (5 W + 5 W) at 4 Ω (10% THD)
Speakers/Impedance 4 Ω - 16 Ω

AM (MW) tuning range 522 kHz-1 629 kHz

Signal-to-noise ratio 60 dB

Wow and flutter Immeasurable

Wow and flutter 0.35 % (WRMS)

Power consumption 22 W (at operation)

3.0 W (on standby)

Dimensions (W/H/D) (approx.) 145 mm × 209 mm × 226 mm

Mass (approx.) 2.8 kg

Type Full range Bass-reflex type

Speakers 10 cm cone ×1

Power handling capacity 5 W

Impedance 4 Ω

Frequency range 100 Hz to 15 kHz

Dimensions (W/H/D) (approx.) 135 mm × 209 mm × 152 mm

Mass (approx.) 1.3 kg each

Design and specifications are subject to change without notice.

1-2 (No.MB107)

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

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.MB107)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.MB107)

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 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 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 CD pickup unit.

• Apply solder to the short land sections before the flexible wire is disconnected from the connector on the CD servo board. (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.

(No.MB107)1-5

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

ADVARSEL: Usynlig laser­strŒling ved Œbning, nŒr
sikkerhedsafbrydere er ude
af funktion. UndgŒ uds¾t­telse for strŒling (d)

CLASS 1
LASER PRODUCT

CAUTION: Invisible laser

radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE
TO BEAM. (e)

VARNING: Osynlig laser­strŒlning nŠr denna del Šr
šppnad och spŠrren Šr
urkopplad. Betrakta ej
strŒlen. (s)

VARO: Avattaessa ja suo­jalukitus ohitettaessa olet
alttiina nŠkymŠttšmŠlle
lasersŠteilylle. lŠ katso
sŠteeseen. (f)

1-6 (No.MB107)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB107)1-7

SECTION 3

y

y

DISASSEMBLY

3.1 Main body

3.1.1 Removing the Front panel assembly
(See Fig.1 ~ 5)

(1) Remove the two screws A and the two screws B on the

back of the body.
(2) Remove the four screws C on each side of the body.
(3) Remove the two screws D on the bottom of the body.
(4) Move the front panel assembly in the direction of the arrow

and detach. Disconnect the wire from connector CN860

and FM-ANT.

Caution:

When reassembling, set the tab “a” on the right and left side to
the groove, and move.

CD mechanism assembly

A

Front panel assembl

D

Fig.3

CD mechanism assembl

Fig.1

Front panel assembly

C

Joint a

B

Front panel
assembly

Joint a

Fig.4

FM-ANT

1-8 (No.MB107)

Fig.2

CN860

Fig.5

3.1.2 Removing the Main board
(See Fig.6 , 7)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) Disconnect the wire from all connectors on the main board.
(2) Remove the two screws E and release the joint b.

Front panel

assembly

CN301

CN370

CN601

CN602

CN260

CD mechanism

assembly

CN850

CN851

Joint b

CD mechanism

assembly

CN801

Main board

Fig.6

Front panel assembly

E

Main board

Fig.7

(No.MB107)1-9

3.1.3 Removing the CD mechanism assembly and the Switch board
(See Fig.8 ~ 10)

• Prior to performing the following procedure, remove the front

panel assembly and the main board.
(1) Cut off the four bands setting the wires.
(2) Disconnect the wire from connector on the CD open switch

and CN705
(3) Remove the two screws F on the front panel assembly.
(4) Release the joint d of the CD mechanism assembly.
(5) Remove the five screws G attaching the switch board to the

CD mechanism assembly.

on the CD mechanism board.

Front panel

assembly

Band

F

F

Band

Joint d

Open switch

connecter

CD mechanism

assembly

CN705

Fig.8

CD mechanism

assembly

1-10 (No.MB107)

Front panel assembly

G

G

Fig.9

Fig.10

Front panel

assembly

Switch board

CD mechanism

assembly

3.1.4 Removing the CD mechanism board
(See Fig.11 ~ 13)

• Prior to performing the following procedure, remove the front

panel assembly, the main board and the CD mechanism
assembly.
(1) Disconnect connector on the CD mechanism.
(2) Remove the four screws H on the CD mechanism

assembly.

(3) Cut off the band setting each wire and disconnect the card

wire from connector on the CD mechanism.

(4) Remove the screw J attaching the wire on the CD

mechanism board.

Caution:

The metal washer and nut come off.

(5) Remove the four screws K attaching the CD mechanism.

Front panel

CD mechanism

board

Switch board

HH

Connecter

Band

CD mechanism

board

J

Nut

Fig.11

Connecter

CD mechanism

Fig.12

CD mechanism

assembly

Band

assembly

CD mechanism

assembly

KK

CD mechanism

Fig.13

(No.MB107)1-11

3.1.5 Removing the Headphone board
(See Fig.14)

• Prior to performing the following procedure, remove the front

panel assembly, the main board and the CD mechanism
assembly.
(1) Remove the screw L on the bracket and pull out the

headphone board.

3.1.6 Removing the LCD board
(See Fig.15)

• Prior to performing the following procedure, remove the front

panel assembly, the main board and the CD mechanism
assembly.
(1) Remove the ten screws M and the two screws N on the

Front panel assembly.

CD mechanism

assembly

Switch board

Fig.14

Head phones board

Head phones

L

bracket

M

3.1.7 Removing the Cassette mechanism
(See Fig.16)

• Prior to performing the following procedure, remove the front

panel assembly and the main board.
(1) Remove the four screws P on the front panel assembly and

press the eject button on the front side to remove the
cassette mechanism assembly.

M

M

Front panel

assembly

N

LCD board

Fig.15

1-12 (No.MB107)

PP

Cassette mechanism

assembly.

Fig.16

3.1.8 Removing the transformer board

(See Fig.17,18)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) From the rear cover assembly, remove the screw Q

attaching the transformer board.
(2) Remove the four screws R attaching the transformer.
(3) Remove the two screws S setting the power cord.
(4) Pull out the transformer and the transformer board,

unsolder the eight soldering.

3.1.9 Removing the transformer
(See Fig.17,18)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) From the rear cover assembly, remove the screw Q

attaching the transformer board.
(2) Remove the four screws R attaching the transformer.
(3) Remove the two screws S setting the power cord.
(4) Pull out the transformer and the transformer board,

unsolder the six soldering.

Solder point

Trans borad

Solder point

Q

Fig.17

Solder point

3.1.10 Removing the FM-antenna board
(See Fig.18)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) Remove the screw T on the rear cover assembly.
(2) Unsolder the FM-antenna wire on the FM-antenna board.

FM ANT board

T

S

R

R

Fig.18

(No.MB107)1-13

SECTION 4

ADJUSTMENT

4.1 Measuring instructions required for adjustment

(1) AM signal generator
(2) FM signal generator
(3) Intter mediate frequency sweep generater
(4) FM stereo signal generator
(5) Low-frequency oscillator (oscillation frequency 50 Hz-20

kHz, 0dB output with 600 Ω impeadance)

(6) Attenuator (600 Ω impeadance)

(7) Electric voltmeter
(8) Distotion meter

(9) Torque guage (cassette for CTG-N)
(10) Wow & flutter meter
(11) Frequency counter meter

4.1.1 Amplifier section

Reference output

Speaker output 0 dB(1V)/ 4 Ω
H. Phone output -10 dB(0.1V) 32Ω

4.1.2 CD section

Test disc: JVC standard disc

4.1.3 Test tape

JVC standard test tape

4.1.4 Measuring instruments Radio section

FM 1 kHz, 22.5 kHz deviation
FM STEREO : 1kHz, 67.5 kHz deviation
Pilot signal: 7.5 kHz
AM : 1 kHz, 30% modulation
Reference output:

Speaker output : 0 dB (1V) 4 Ω
Headphone output : -10 dB (0.1V) 32 Ω

1-14 (No.MB107)

4.1.5 Cassette Amplifier Section

Head azimuth
adjustment

Tape speed
and wow/
flutter check
and adjustment

PB frequency
response check

Measuring ConditionItem

Test tape:
8 kHz
Signal output
terminal:
PHONES
(with 32 ohm load)

Test tape:
3 kHz
Signal output
terminal:
PHONES
(with 32 ohm load)

Test tape:

Signal output
termnal:
PHONES
(with 32 ohm load)

Check and adjustment procedure

1. Play back the test tape (8 kHz).

2. Adjust the head azimuth adjusting screw so that
the phase difference between the R and L
channels is minimized at an output level that is
within 2 dB of the maximum output level. After
thie adjustment, lock the head azimuth adjusting
screw with screw, sealant to cover more than a
half of the screw head.

3. When the head azimuth is maladjusted, correct it
with the head azimuth adjusting screw.

1. Play back the test tape (3 kHz) by
the end portion.

2. Connect a frequency counter and check that it
reads between 2940 and 3090 Hz. If not, adjust
the frequency with the motor semifixed resistor.

3. Check that the wow/flutter is within 0.38%
(unweighted.)

Play back the test tape while con-firming
that deviation between the 1 kHz signal and 8 kHz
signal should be 0 (+3~-6) dB.

Standard value
Output level:

Within 2 dB of
maximum output
level
Phase difference
L and R
channels:
Minimum

2940 to 3090 Hz

Within 0.38%
(unweighted)

Deviation between
1 kHz and 8 kHz:
0 (+3~-6) dB

Adjusting part

Head azimuth
adjusting
screw (To be
used only
after head
replacement)
See Fig 3-1

Tape
speed:
Motor
semifixed
resister

check only

Bias frequency
check

REC and PB
frequency
response
adjustment

Tape: Normal
Signal output
terminal: Cassette
REC./PLAY HEAD

Test tape:
Signal input FM22.5
DEV 60dB with
Emphasis
signal output
terminal: PHONES
(with 32 ohm load)

Set the TUNER or CD function and with TAPE to
record. Check to see if the frequency at the
measuring point T360 is 60 kHz 1 kHz if not
adjst T360 until the frequency counter indicates
60 kHz 1 kHz.

At TUNER, set the BAND to the FM position, and
record the reference 1 kHz signal and 8kHz signal
alternately repeatedly. While playing back the
recorded signal differ from that of the 1 kHz signal
by within 0 (+3~-6) dB.

T360

Level difference
between REC and
PB: Within 0 (+3~-6)
dB.

(No.MB107)1-15