JVC UXH-10 Service manual
SERVICE MANUAL
MICRO COMPONENT SYSTEM
MB06620041
UX-H10
TIMER
STANDBY/ON
TIMER SET
ON/OFF
RANDOM SLEEP
INTRO
REMAIN
TUNER
TAPE CD
/BAND
BEAT CUT
DISPLAY
/CLOCK SET
SOUND
MUTING
/BASS
REPEAT
ST/MONOPROGRAM
CD
VOLUME
STANDBY/ON
STANDBY
MICRO COMPONENT SYSTEM
UX-H10
VOLUME
RM-SUXH10U REMOTE CONTROL
CD SYNCHRO RECORDING
OPEN
Area Suffix
US ---------------- Singapore
UT ---------------------Taiwan
UW ---- Brazil,Mexico,Peru
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MB066
2004/1
SPECIFICATION
Amplifier Section
CA-UXH10
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 110 V-127 V/ 220 V-240 V , adjustable with the voltage selector, 50 Hz/ 60 Hz
Speaker Section
SP-UXH10
Design and specifications are subject to change without notice.
Output Power (IEC 268-3) 10 W (5 W + 5 W) at 4 Ω (10% THD)
Speakers/Impedance 4 Ω - 16 Ω
AM tuning range AM 10 kHz intervals 530 kHz- 1 710 kHz
AM 9 kHz intervals 531 kHz-1 710 kHz
Signal-to-noise ratio 60 dB
Wow and flutter Immeasurable
Wow and flutter 0.35 % (WRMS)
Power consumption 22 W (at operation)
4.5 W (on standby)
Dimensions (W/H/D) (approx.) 145 mm × 209 mm × 226 mm
Mass (approx.) 2.6 kg
Type Full range bass-reflex type
Speakers 10 cm cone x1
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
1-2 (No.MB066)
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of th is product contains special hardw are 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 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 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 resp onsibility 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 compone nts 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.MB066)1-3
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 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 an d before installation, bo th sides of the laser diode on the re placement 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 CD pickup unit.
• Apply solder to the short land sections before the fle xible 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.
1-4 (No.MB066)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB066)1-5
SECTION 3
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 assembly
D
Fig.3
CD mechanism assembly
Fig.1
Front panel assembly
C
Joint a
B
Front panel
assembly
Joint a
Fig.4
FM-ANT
1-6 (No.MB066)
Fig.2
CN860
Fig.5
3.1.2 Removing the Main board
(See Fig.6 , 7)
• Prior to performing the fol lowing 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.MB066)1-7
3.1.3 Removing the CD mechanism assembly and the Switch board
(See Fig.8 ~ 10)
• Prior to performing th e 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
Fig.8
CD mechanism
assembly
CD mechanism
assembly
CN705
1-8 (No.MB066)
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 fol lowing 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
Connecter
Nut
Fig.11
Band
CD mechanism
assembly
Fig.12
CD mechanism
assembly
CD mechanism
assembly
KK
CD mechanism
Fig.13
(No.MB066)1-9
3.1.5 Removing the Headphone board
(See Fig.14)
• Prior to performing th e 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 th e 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.
Head phones board
Head phones
bracket
L
CD mechanism
assembly
Fig.14
Switch board
M
3.1.7 Removing the Cassette mechanism
(See Fig.16)
• Prior to performing th e 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
1-10 (No.MB066)
PP
Cassette mechanism
assembly.
Fig.16
3.1.8 Removing the Transformer board
(See Fig.17)
• Prior to performing the fol lowing procedure, remove the front
panel assembly.
(1) Remove the screw Q on the rear cover assembly.
(2) Pull out the transformer board in the direction of the arrow.
(3) Unsolder the wire extending from the transformer.
3.1.9 Removing the Transformer
(See Fig.18 , 19)
• Prior to performing the fol lowing procedure, remove the front
panel assembly and the transformer board.
(1) Remove the two screws R attaching the voltage selector on
the bottom of the rear cover assembly.
(2) Remove the four screws S on the rear cover assembly.
(3) Remove the two screws T setting the power cord on the
rear cover assembly.
(4) Cut off the band connecting the power cord to the
transformer if necessary, remove the transformer.
Trans borad
Solder point
Q
Fig.17
R
3.1.10 Removing the FM-antenna board
(See Fig.19)
• Prior to performing the fol lowing procedure, remove the front
panel assembly.
(1) Remove the screw U on the rear cover assembly.
(2) Unsolder the FM-antenna wire on the FM-antenna board.
FM ANT board
U
T
Fig.18
Solder point
e Section
S
S
Fig.19
(No.MB066)1-11
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
1-12 (No.MB066)
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.MB066)1-13
4.1.6 Tuner Section
Item
AM IF adjustment
AM tracking
adjustment
FM Tracking
Adjustment
Measuring
Condition
Signal input:
Loop ANTENNA
Signal output:
U201 PIN 16
Signal input:
Loop antenna
PHONES (with 32
ohm Load)
Signal input point:
FM-ANT
Phones With 32
ohm load
Check and adjustment procedure Standard value Adjusting part
1.Set the intermediate frequency sweep generator to
AM 450 kHz.
2.Adjust the T201 for maximum and center output.
1.Set the TUNER at 531 kHz adjust T202 until the
test pin of R229 Voltage at 1.5V 0.1V.
2.Set the TUNER at 1710 kHz, Check the pin of
R229 Voltage at 8.4V 6V.
3.Set theTUNER and S/G at 603 kHz, adjust T204
for maximum output.
4.Set the TUNER and S/G at 1404 kHz, adjust
VC201 for maximum output.
5.Repeat the above steps 3 and 4.
1.Set the Tuner at 87.5MHz adjust L203 until the test
pin of R230 voltage at 2.4V 0.1V
2.Set the Tuner at 108MHz. Check the pin of R230
voltage at 8 0.8V
3.Set the Tuner and S/G at 90.1MHz. Adjust L204 for
maximum output.
4.Set the Tuner and S/G at 106.1MHz. Adjust VC 202
for maximum output.
5.Repeat the above step 3 and 4
T201
See Fig 3-3
T202
T204
R229
VC201
R230
L204
VC202
1-14 (No.MB066)
Location of adjusting parts
Cassette mechanism section
Tape Speed Adj.
-
+
CASSETTE MOTOR
Figure 3-1 Head Output Signal
Main board assembly
(AM lF)
(FM OSC)
L203
T201
Figure 3-2
R230
(FM VT)
T202
(AM OSC)
VC202
(FM RF)
L204 (FM RF)
R229
(AM VT)
T202
T204
(AM RF)
FM-ANT
(AM RF)
T360
(BIAS FREQUENCY)
(No.MB066)1-15
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