JVC UX-H10 User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB066
2004/1
MICRO COMPONENT SYSTEM
MB06620041UX-H10
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
TIMER SET
RANDOM SLEEP
INTRO
STANDBY/ON
TIMER
ON/OFF
REMAIN
BEAT CUT
DISPLAY
/CLOCK SET
MUTING
RM-SUXH10U REMOTE CONTROL
SOUND
/BASS
CD
TAPE CD
VOLUME
TUNER
/BAND
REPEAT
ST/MONOPROGRAM
STANDBY/ON
STANDBY
OPEN
VOLUME
MICRO COMPONENT SYSTEM
UX-H10
CD SYNCHRO RECORDING
Area Suffix
US ---------------- Singapore
UT ---------------------Taiwan
UW ---- Brazil,Mexico,Peru

1-2 (No.MB066)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier Section
CA-UXH10 Output Power (IEC 268-3) 10 W (5 W + 5 W) at 4 Ω(10% THD)
Speakers/Impedance 4 Ω- 16 Ω
Tuner FM tuning range 87.50 MHz-108.00 MHz
AM tuning range AM 10 kHz intervals 530 kHz- 1 710 kHz
AM 9 kHz intervals 531 kHz-1 710 kHz
CD player Dynamic range 60 dB
Signal-to-noise ratio 60 dB
Wow and flutter Immeasurable
Cassette deck Frequency response Normal (type I) 100 Hz-10 000 Hz
Wow and flutter 0.35 % (WRMS)
General Power requirement AC 110 V-127 V/ 220 V-240 V , adjustable with the voltage selector, 50 Hz/ 60 Hz
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
Speaker Section
SP-UXH10 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

(No.MB066)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.MB066)
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 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.
(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 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.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap

(No.MB066)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MB066)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the Front panel assembly
(See Fig.1 ~ 5)
(1) Remove the two screws Aand the two screws Bon the
back of the body.
(2) Remove the four screws Con each side of the body.
(3) Remove the two screws Don 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.
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5
A
B
CD mechanism assembly
C
Front panel assembly
D
Front panel assembly
Joint a
Joint a
Front panel
assembly
CD mechanism assembly
FM-ANT
CN860

(No.MB066)1-7
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 Eand release the joint b.
Fig.6
Fig.7
CN801
CN851
CN850
CN370
CN301
CN601
CN602
CN260
Main board
CD mechanism
assembly
Front panel
assembly
E
Main board
CD mechanism
assembly
Front panel assembly
Joint b

1-8 (No.MB066)
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 on the CD mechanism board.
(3) Remove the two screws Fon the front panel assembly.
(4) Release the joint dof the CD mechanism assembly.
(5) Remove the five screws Gattaching the switch board to the
CD mechanism assembly.
Fig.8
Fig.9
Fig.10
Band
F
F
Band
CN705
Open switch
connecter CD mechanism
assembly
Front panel
assembly
Joint d
CD mechanism
assembly
Front panel assembly
G
GSwitch board
CD mechanism
assembly
Front panel
assembly

(No.MB066)1-9
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 Hon 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 Jattaching the wire on the CD
mechanism board.
Caution:
The metal washer and nut come off.
(5) Remove the four screws Kattaching the CD mechanism.
Fig.11
Fig.12
Fig.13
HH
Switch board
CD mechanism
board
CD mechanism
assembly
Front panel
Connecter
Band
J
Band
Connecter
CD mechanism
assembly
Nut
CD mechanism
board
KK
CD mechanism
assembly
CD mechanism

1-10 (No.MB066)
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 Lon the bracket and pull out the
headphone board.
Fig.14
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 Mand the two screws Non the
Front panel assembly.
Fig.15
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 Pon the front panel assembly and
press the eject button on the front side to remove the
cassette mechanism assembly.
Fig.16
L
Head phones board
Head phones
bracket
CD mechanism
assembly
Switch board
Front panel
assembly
LCD board
N
M
M
M
PP
Cassette mechanism
assembly.

(No.MB066)1-11
3.1.8 Removing the Transformer board
(See Fig.17)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the screw Qon the rear cover assembly.
(2) Pull out the transformer board in the direction of the arrow.
(3) Unsolder the wire extending from the transformer.
Fig.17
3.1.9 Removing the Transformer
(See Fig.18 , 19)
• Prior to performing the following procedure, remove the front
panel assembly and the transformer board.
(1) Remove the two screws Rattaching the voltage selector on
the bottom of the rear cover assembly.
(2) Remove the four screws Son the rear cover assembly.
(3) Remove the two screws Tsetting 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.
3.1.10 Removing the FM-antenna board
(See Fig.19)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the screw Uon the rear cover assembly.
(2) Unsolder the FM-antenna wire on the FM-antenna board.
Fig.18
Fig.19
Q
Trans borad
Solder point
R
U
TS
S
FM ANT board
Solder point
e Section

1-12 (No.MB066)
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 Ωimpeadance)
(6) Attenuator (600 Ωimpeadance)
(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

(No.MB066)1-13
4.1.5 Cassette Amplifier Section
Check and adjustment procedure Standard value Adjusting part Measuring ConditionItem
Head azimuth
adjustment
Output level:
Within 2 dB of
maximum output
level
Phase difference
L and R
channels:
Minimum
Head azimuth
adjusting
screw (To be
used only
after head
replacement)
See Fig 3-1
Tape
speed:
Motor
semifixed
resister
check only
Deviation between
1 kHz and 8 kHz:
0 (+3~-6) dB
T360
Level difference
between REC and
PB: Within 0 (+3~-6)
dB.
2940 to 3090 Hz
Within 0.38%
(unweighted)
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)
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)
Tape speed
and wow/
flutter check
and adjustment
PB frequency
response check
Bias frequency
check
REC and PB
frequency
response
adjustment
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.
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.
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.

1-14 (No.MB066)
4.1.6 Tuner Section
Measuring
Condition
Item
AM IF adjustment
T202
T204
R229
VC201
R230
L204
VC202
T201
See Fig 3-3
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
AM tracking
adjustment
FM Tracking
Adjustment
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

(No.MB066)1-15
+
-
T360
(BIAS FREQUENCY)
Location of adjusting parts
Cassette mechanism section
Figure 3-1 Head Output Signal
Main board assembly
CASSETTE MOTOR
Tape Speed Adj.
Figure 3-2
(FM VT)
VC202
L204 (FM RF)
R230
(FM RF)
(AM VT)
(AM RF)
(AM OSC)
(AM lF)
(AM RF)
FM-ANT
L203
T204
T202
T201
T202
R229
(FM OSC)

1-16 (No.MB066)
SECTION 5
TROUBLESHOOTING
Circuit Symptom Cause and Remedy
General No sound
AM No sound, weak sound
(Low sensitivity)
No sound, weak sound
(Low sensitivity)
FM
Tape No sound / Recording
Unsteady tape sound,
weak sound
CD Cannot read the TOC.
no sound
Speakers are not connected:
Check the speaker connection.
Wrong function is selected:
Set switch to the proper position.
Defective volume control:
Set the volume control to a proper sound level.
Defective the Headphone jack:
Replace the headphone jack.
Defect in U801
Check voltages. Replace if necessary.
Defect in U601
Check voltages. Replace if necessary.
Improper location of unit:
Rotate or reposition the unit.
Defect in IF T201:
Check registance, voltage, and current. Replace as needed.
Defect AM antenna coil L202 or oscilloscope coil T202:
Replace if necessary.
Intermediate frequency tuning faulty:
Readjust (see "Adustment").
RF tracking faulty:
Readjust (see "Adjustment").
Defective U201:
Check voltages. Replace if necessary.
Defective U260:
Check voltages. Replace if necessary.
Poor contact in antenna circuit:
Check resistance and resolder.
FM antenna not connected:
Connect the built-in or external antenna.
Defective band selector switch:
Replace or repair the switch.
Defective U201:
Check voltages. Replace if necessary.
Defective U260:
Check voltages. Replace if necessary.
Intermediate frquencytuning faulty:
Readjust (see !Adjustment").
Poor contact in FM antenna circuit:
Resolder or repair as required.
Dirty capstan or head:
Clean the capstan or head with alcohol.
Irreguler cassette tape winding:
Replace tape.
Defective U301:
Check voltage. Replace if necessary.
Cassette erasure prevention tabs broken out:
Replace tape or cover tab openings with adhesive tape.
Disc is inserted upside down:
Insert disc correctry.
Disc is dirty:
Wipe clean with a soft cloth.
Disc is scratched:
Use a new disc.
Disc is seriously warped:
Use a new disc.
A non-standard disc has been inserted:
Use only a barand neme disc.
Moisuture has formed inside the CD deck:
Wait about 20 to 30 minutes.
Defective IC701:
Check voltages. Replace if necessary.
Defective IC702:
Check voltages. Replace if necessary.
Defective IC703:
Check voltages. Replace if necessary.
Defect in the CD pickup mechanism:
Replace as required.

(No.MB066)1-17

(No.MB066)
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
VICTOR COMPANY OF JAPAN, LIMITED
WPC
Printed in Japan

SCHEMATIC DIAGRAMS
MICRO COMPONENT SYSTEM
No.MB066SCH
2004/1
COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LTD.
UX-H10
CD-ROM No.SML200401
Contents
Block diagram ------------------------------------------------------- 2-1
Standard schematic diagrams ---------------------------------- 2-2
Printed circuit boards --------------------------------------------- 2-9 to 12
TIMER SET
RANDOM SLEEP
INTRO
STANDBY/ON
TIMER
ON/OFF
REMAIN
BEAT CUT
DISPLAY
/CLOCK SET
MUTING
RM-SUXH10U REMOTE CONTROL
SOUND
/BASS
CD
TAPE CD
VOLUME
TUNER
/BAND
REPEAT
ST/MONOPROGRAM
STANDBY/ON
STANDBY
OPEN
VOLUME
MICRO COMPONENT SYSTEM
UX-H10
CD SYNCHRO RECORDING
Area Suffix
US ---------------- Singapore
UT ---------------------Taiwan
UW ---- Brazil,Mexico,Peru

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.)