JVC XV-N350B User manual

M
O
DEL
S
: XV-N350B
/
XV-N352
S
S
E
R
VI
C
E MANUA
L
P
/
N
O
:
AFN
3162
9
3
9
4MAR
C
H
,
200
7
M
O
DEL
S
: XV-N350B
/
XV-N352
S
DVD-VIDE
O
PLAYE
R

CONTENTS
SECTION 1.........SUMMARY
SECTION 2.........CABINET & MAIN CHASSIS
SECTION 3.........ELECTRICAL
SECTION 4.........MECHANISM (DP-11)
SECTION 5.........REPLACEMENT PARTS LIST

1-2
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS..................................1-3
SERVICING PRECAUTIONS....................................................................................................................1-4
• GENERAL SERVICING PRECAUTIONS
• INSULATION CHECKING PRODEDURE
• ELECTROSTATICALLY SENSITIVE (ES) DEVICES
SERVICE INFORMATION FOR EEPROM ...........................................................................................1-5
SPECIFICATIONS ........................................................................................................................................1-6

1-3
PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original design be
modified or altered without permission from JVC. All components should be replaced
only with types identical to those in the original circuit and their physical location, wiring
and lead dress must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component
designators and are required to maintain safe performance. No deviations are
allowed without prior approval by LG Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into the
set are not delayed until the new service literature is printed.
CAUTION : Do not attempt to modify this product in any way. Never perform
customized installations without manufacturer’s approval. Unauthorized
modifications will not only void the warranty, but may lead to property damage or user
injury.
Service work should be performed only after you are thoroughly familiar with these
safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to alert
the service personnel to important safety information in the service
literature.
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage” that may be of sufficient magnitude
to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equilateral
triangle is intended to convey to the service personnel the following
fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF
FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After
the original service problem has been corrected, make a check of the following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and from
the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields, strain
reliefs, power supply cords, and other hardware have been reinstalled per the
original design. Be sure that the safety purpose of the polarized line plug has not
been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign particles.
4. Check for physical evidence of damage or deterioration to parts and components,
for frayed leads or damaged insulation (including the AC cord), and replace if
necessary.
5. No lead or component should touch a high current device or a resistor rated at 1
watt or more. Lead tension around protruding metal surfaces must be avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of
electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING
THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity
in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15
mfd 150V AC type capacitor between a known good earth ground water pipe,
conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC
voltage across the combination of 1500 ohm resistor and .15 mfd capacitor.
Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage
measurements for each exposed metallic part. Voltage measured must not
exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value
exceeding this limit constitutes a potential shock hazard and must be corrected
immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf
space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where dew
is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer should also
avoid the use of decorative scarves or other coverings that might obstruct
ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must follow
the factory-approved mounting instructions. A product mounted to a shelf or
platform must retain its original feet (or the equivalent thickness in spacers) to
provide adequate air flow across the bottom. Bolts or screws used for fasteners
must not touch any parts or wiring. Perform leakage tests on customized
installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilted
position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small casters
across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.

1-4
SERVICING PRECAUTIONS
CAUTION: Before servicing the DVD covered by this service
data and its supplements and addends, read and follow the
SAFETY PRECAUTIONS. NOTE: if unforeseen circumstances
create conflict between the following servicing precautions
and any of the safety precautions in this publication, always
follow the safety precautions.
Remember Safety First :
General Servicing Precautions
1.Always unplug the DVD AC power cord from the AC power
source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnecting or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an
electrolytic capacitor.
Caution: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2.Do not spray chemicals on or near this DVD or any of its
assemblies.
3.Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner,
cotton-tipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4.Do not defeat any plug/socket B+ voltage interlocks with
which instruments covered by this service manual might
be equipped.
5.Do not apply AC power to this DVD and / or any of its
electrical assemblies unless all solid state device heat
sinks are correctly installed.
6.Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter (500V)
to the blades of the attachment plug. The insulation
resistance between each blade of the attachment plug and
accessible conductive parts (Note 1) should be more than
1Mohm.
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1.Immediately before handling any semiconductor
component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device,
which should be removed for potential shock reasons prior
to applying power to the unit under test.
2.After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3.Use only a grounded-tip soldering iron to solder or
unsolder ES devices.
4.Use only an anti-static solder removal device. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices.
5.Do not use freon-propelled chemicals. These can generate
an electrical charge sufficient to damage ES devices.
6.Do not remove a replacement ES device from its
protective package until immediately before you are ready
to install it. (Most replacement ES devices are packaged
with leads electrically shorted together by conductive
foam, aluminum foil, or comparable conductive material).
7.Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution: Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8.Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static
electricity sufficient to damage an ES device.)

1-5
SERVICE INFORMATION FOR EEPROM
POWER ON
Press number 0~8, Press charater
A~F (1~6 for a while)
Press pause key once
Change will be applied when power
OFF-->ON.
Use arrow key (F D G E) to move
to approprite position and make
changes
DVD LOGO Status (NO Disk status)
Remotecontrol
Pause key-->1-->4-->7-->2 in order.
MODEL: XV-N350B/XV-N352S
NAME HEX
OPT 1 00
OPT 2 00
OPT 3 00
OPT 4 00
OPT 5 00
OPT 6 00
OPT 7 00
OPT 8 00
DETECT NEW EEPROM
(OPTION EDIT SCREEN)

1-6
SPECIFICATIONS
• GENERAL
Power requirements : AC 200 ~ 240V, 50/60Hz
Power consumption : 8W
Dimensions (Approx.) : 430 x 35 x 202mm (17 x 1.4 x 7.9inches)
(W x H x D) without foot
Net Weight (Approx.) : 1.6kg (3.5lbs)
Operating temperature : 5°C to 35°C (41°F to 95°F)
Operating humidity : 5% to 90%
• OUTPUTS
VIDEO OUT : 1.0V(p-p), 75Ω, sync negative, RCA jack x 1 / SCART (TO TV)
AUDIO OUT : 2.0Vrms (1KHz, 0dB), 600Ω, RCA jack (L, R) x 1 / SCART (TO TV)
DIGITAL OUT (COAXIAL) : 0.5V(p-p), 75Ω, RCA jack x 1
SCART Model only
• SYSTEM
Laser : Semiconductor laser, wavelength 650nm
Signal system : PAL / NTSC
Frequency response : DVD (PCM 96 kHz) : 8Hz to 44kHz
DVD (PCM 48 kHz) : 8Hz to 22kHz
CD : 8Hz to 20kHz
Signal-to-noise ratio : More than 90dB (ANALOG OUT connectors only)
Harmonic distortion : Less than 0.02%
Dynamic range : More than 95dB (DVD/CD)
Accessories : Video cable (1), Audio cable (1), Remote control (1), Batteries (2)

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS .....................................................................................................................................2-2
1. CABINET AND MAIN FRAME SECTION ..................................................................................................2-2
2. DECK MECHANISM SECTION (DP-11) ...................................................................................................2-3
3. PACKING ACCESSORY SECTION...........................................................................................................2-4

OPTIONAL PART
CB
462
460
460
460
250
462
A44
A
300
A26
283
261
261
260
262
320
467
465
261
D
A
C
B
462
462
A48
A46
P101
A47
MAIN
SMPS
5.1CH
SCART
452
D
A43
A49
CABLE1
CN903
452
280
KEY
TIMER
452
A42
2-2
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION

2-3
2. DECK MECHANISM SECTION (DP-11)
A26
A02
439
018
013
017
014
001
002
003
020
016
015B
015A
435
015
019
440 432
012A
010
439
431
435
030
024
025
036
A03
430
021
012A
012
012
026
A01

2-4
3. PACKING ACCESSORY SECTION
808 BATTERY
810 CABLE SET ASS’Y
811 PLUG ASS’Y 1WAY(YELLOW)
812 PLUG ASS’Y 2WAY
801 OWNER’S MANUAL
804 PACKING SHEET
803 PACKING
900 REMOCON
803 PACKING
802 BOX CARTON

3-1
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE.....................................................................................3-2
1. POWER CHECK FLOW ..........................................................................................................................3-2
2. SYSTEM OPERATION FLOW.................................................................................................................3-3
3. SYSTEM TEST FLOW.............................................................................................................................3-4
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING .........................................3-10
1. SYSTEM 27MHZ CLOCK, RESET, FLASH R/W SIGNAL ....................................................................3-10
2. SDRAM CLOCK.....................................................................................................................................3-12
3. TRAY OPEN/CLOSE SIGNAL ...............................................................................................................3-12
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)............................................................3-13
5. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................................3-13
6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................3-14
7. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) ...............................................................3-14
8. FOCUS ON WAVEFORM ......................................................................................................................3-15
9. RACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) ......................................................3-16
10. ZR966 AUDIO COAXIAL OUTPUT (SPDIF) .........................................................................................3-17
11. ZR966 VIDEO OUTPUT WAVEFORM...................................................................................................3-17
12. AUDIO OUTPUT FROM ZR966 ............................................................................................................3-18
CONNECTOR PICTURE ..........................................................................................................................3-19
1. ALL CONNECTOR PICTURE................................................................................................................3-19
2. P2201 CONNECTOR PICTURE............................................................................................................3-20
3. P2202 CONNECTOR PICTURE............................................................................................................3-20
4. PW6101 CONNECTOR PICTURE ........................................................................................................3-21
5. P6501 CONNECTOR PICTURE............................................................................................................3-21
6. P6602 CONNECTOR PICTURE............................................................................................................3-22
7. P6901 CONNECTOR PICTURE............................................................................................................3-22
8. P7301 CONNECTOR PICTURE............................................................................................................3-23
BLOCK DIAGRAMS ..................................................................................................................................3-24
1. OVERALL BLOCK DIAGRAM ...............................................................................................................3-24
2. POWER SUPPLY BLOCK DIAGRAM ...................................................................................................3-25
3. SERVO BLOCK DIAGRAM ...................................................................................................................3-26
4. MPEG & MEMORY BLOCK DIAGRAM.................................................................................................3-27
5. VIDEO BLOCK DIAGRAM.....................................................................................................................3-28
6. AUDIO BLOCK DIAGRAM.....................................................................................................................3-29
CIRCUIT DIAGRAMS................................................................................................................................3-31
1. POWER (SMPS) CIRCUIT DIAGRAM ..................................................................................................3-31
2. SYSTEM (MPEG) CIRCUIT DIAGRAM.................................................................................................3-33
3. SERVO CIRCUIT DIAGRAM .................................................................................................................3-35
4. AV/JACK CIRCUIT DIAGRAM ...............................................................................................................3-37
5. TIMER/KEY CIRCUIT DIAGRAM ..........................................................................................................3-39
CIRCUIT VOLTAGE CHART...................................................................................................................3-41
PRINTED CIRCUIT BOARD DIAGRAMS...........................................................................................3-43
1. MAIN P.C.BOARD..................................................................................................................................3-43
2. KEY P.C.BOARD ...................................................................................................................................3-45
3. TIMER P.C.BOARD ...............................................................................................................................3-45
4. SMPS P.C.BOARD ................................................................................................................................3-47
5. SCART P.C.BOARD (SCART MODEL ONLY).......................................................................................3-47

3-2
ELECTRICAL TROUBLESHOOTING GUIDE
Is 5.6V present at
collector of Q126?
No 3.3VA
YES YES
YES YES
No 5V No 3.3VA.
Replace Q126. Check FR101 Replace Q121.
YES
Is there a DC voltage at
cathode of D105 or D107?
YES
NO
NO
NO
NO
Replace IC101.
1. POWER CHECK FLOW
A. B.
Check D105/D106/D107/
D108 and replace.
Is 3.3VA
section working?
Is 3.3VA
section working?
Is 3.3V
present at emitter
of Q121?

3-3
ELECTRICAL TROUBLESHOOTING GUIDE
Power on
1. 8032 initializes SERVO,DSP & RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
Show LOGO
Tray close to closed position
SLED moves to inner position
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
1. Execute pressed Key & IR key
2. System operation routine loop
1. Stop playback & open Tray
2. Display tray open message & LOGO
NO
YES
YES
NO
YES
YES
NO
NO
2. SYSTEM OPERATION FLOW
Tray closed ?
SLED at inner side ?
Recieve OPEN/CLOSE Key?
Receive CLOSE Key?

3-4
3. SYSTEM TEST FLOW
TEST
Replace power PCBA or AC transformer.
YES
NO
Switch on the power PCBA
Repair or Replace power PCBA
YES
NO
Make sure the main PCBA don't
short on VCCs and switch it on.
YES
Check the regulators or related diodes.
YES
NO
Connect to PC RS232 cable and
update the FLASH memory code.
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal PRD,
RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.
NO
A
YES
Check the AC
Voltage Power PCBA (110V
or 220V)
Update FLASH
successfully?
Is the DC
voltage outputs OK?
(5V, 3.3V, 12V, 5.6V
MOTOR)
Is 3.3V
and 1.8V DC outputs normal
on main PCBA?
ELECTRICAL TROUBLESHOOTING GUIDE

3-5
RESET or power on.
NO NO
YES
Check connection lines
between FLASH & ZR966
and the FLASH access time
whether is suitable or not.
NO
YES
Check connection lines
between SDRAM & ZR966
and the SDRAM is damaged.
NO
YES
Check the related
circuit of ZR966.
NO
YES
Check the filtering and amp
circuit of TV signal.
Check AV cable
connection to TV set.
NO NO
YES
Check the load OPEN &
CLOSE switch
NO
YES
Check the Tray control IO
pins on ZR966 & AM5890S.
NO
YES
Check the Tray control
amplifying circuit on motor driver.
Check the cable connection
between main PCBA and loader.
YES
YES
Show LOGO?
Flash
memory operates
properly?
ZR966
VIDEO outputs
properly?
Normal
TROUT & TRIN
signals?
Normal
TRCLOSE & TROPEN
signal?
Normal LOAD+ &
LOAD signal?
Does
Tray move inside
when it is not at closed
position?
SDRAM
works properly?
Have TV
signal output?
A
B
ELECTRICAL TROUBLESHOOTING GUIDE

3-6
NONO
YES
Check the connection line
of DRVSB signal.
NO
YES
Check the related
circuit of Sled_s.
NO
YES
Check the amp circuit on
motor driver.
Check the cable connection
with MECHA.
Do not put in disc and
tray close.
YES
YES
Check cable connect on
with pick-up head.
YES
YES
Motor
Driver DRVSB Pin
is high?
Is sled_s
DC Level higher than
1.4V?
SL+ and
SL- output properly?
Does
the SLED move
to inner side when it is
at outter position?
NONO Check focus_s connection
on ZR966 and motor dirver.
Proper
focus_s outputs to motor
driver?
NO Check the amp circuit on
motor dirver.
Proper F+ &
F- outputs?
Optical Lens has
movements for searching
focus?
B
C
ELECTRICAL TROUBLESHOOTING GUIDE

3-7
NO NO
YES
YES
Check the laser power circuit
on ZR966 and connecting to
power transistor.
Check cable connection
between transistor ouput
and pick-up head.
NO Laser off
NO NO
YES
Check the related circuit
on RF signal.
Check DVD_LD &
CD_LD signal
YES
YES
NO NO
YES
Check spindle_s related
circuit on ZR966.
SP+ & SP- output properly? NO
YES
Check the spindle control
amp circuit of motor driver.
Check the cable connection
between spindle and main
PCBA.
YES
YES
Laser
turns on when reading
disc?
DVD_LD,
CD_LD output properly?
NO Check the related circuit on
laser power transistor
Collector
voltage of power transistor
is OK?
Put disc in?
Disc ID is correct?
Does spindle rotate?Does spindle rotate? Proper spindle_s
signal on ZR966
Proper RF signal
on OPU
C
D
ELECTRICAL TROUBLESHOOTING GUIDE

3-8
NO NO
YES
YES
Check connections between
ZR966 and pick-up head.
Check cable connection on
pick-up head.
NO
YES
YES
YES
YES
YES
Check cable connection on
pick-up head.
Check RF signal waveform.
Focus on OK? Proper signals on
A,B,C,D of ZR966
NO NO Check the track_s connection
on ZR966 and motor dirver.
Track on OK?
Disc is play?
Properly track_s
signal on ZR966?
NO Check the tracking control
amp circuit on motor driver.
T+ & T- output
properly?
NO Check the focus_s connection
on ZR966 and motor driver.
Check focus_s
signal on ZR966
YES
Check the focus control
amp circuit on motor driver.
F+ & F- output
properly?
D
E
ELECTRICAL TROUBLESHOOTING GUIDE

3-9
NO NO
YES
YES
Check connection between
ZR966 & Audio DAC.
Check Audio filter,
amplify, mute circuit.
NO NO
YES
Check communication
lines on ZR966.
YES
YES
TEST END Check the cable connection
on Front pannel.
Normal
Audio output when disc
playback?
Audio
DAC received correct
data stream?
Commu-
nications between
IR.VFD Front pannel
key & ZR966 is
normally?
Normal
IR.VFD & Front
pannel key
functions?
NO Check the related
circuit of Audio DAC.
Normal Audio
DAC out?
E
ELECTRICAL TROUBLESHOOTING GUIDE