JVC RX-DV31SL Service Manual
SERVICE MANUAL
HOME CINEMA DVD-AUDIO/VIDEO CONTROL CENTER
MB077200310
RX-DV31SL
Area Suffix
US ------------------ Singapore
UF ------------------------ China
UP ------------------------ Korea
UT ----------------------- Taiwan
UW ------- Brazil,Mexico,Peru
RX-DV31 HOME THEATER DVD-AUDIO/VIDEO RECEIVER
COMPACT
SUPER VIDEO
DVD/SUPER VCD/VCD/CD
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.MB077
2003/12
SPECIFICATION
Amplifier
Output Power At Stereo operation Front channels 80 W per channel, min. RMS, both
channels driven into 8 Ω at 1 kHz, with no
more than 0.9% total harmonic distortion.
(IEC268-3/DIN)
At Surround operation Front channels 80 W per channel, min. RMS, driven into 8
Ω at 1 kHz, with no more than 0.8% total
harmonic distortion.
Center channel 80 W, min. RMS, driven into 8 Ω at 1 kHz,
with no more than 0.8% total harmoni c
distortion.
Surround channels 80 W per channel, min. RMS, driven into 8
Ω at 1 kHz, with no more than 0.8% total
harmonic distortion.
Audio (Measured on AC 110 V/120 V/220 V/240 V)
Audio Input Sensitivity/
Impedance (1 kHz)
Audio Input (DIGITAL IN)* Coaxial DIGITAL 1 (DBS) 0.5 V(p-p)/75 Ω
Signal-to-Noise Ratio
('66 IHF/DIN)
Frequency Response (8 Ω) TV, TAPE/CDR, DBS, VCR 20 Hz to 20 kHz (±1 dB)
Tone Control Bass (100 Hz) ±10 dB ±2 dB
Video (Measured on AC 110 V/120 V/220 V/240 V)
Video Input Sensitivity/
Impedance (1 kHz)
Video Output Level/
Impedance (1 kHz)
Tuning Range 87.50 MHz to 108.00 MHz
Tuning Range 531 kHz to 1 602 kHz (at 9 kHz intervals)
Power Requirements AC 110 V/127 V/220 V/230 - 240 V , adjustable with the voltage selector, 50 Hz/60 Hz
Power Consumption 180 W (in operation)
Dimensions (W × H × D) 435 mm × 100 mm × 403.5 mm
Mass 8.4 kg
Designs & specifications are subject to change without notice.
TV, TAPE/CDR, DBS, VCR 240 mV/47 kΩ
Optical DIGITAL 2 (TV) -21 dBm to -15 dBm (660 nm ±30 nm)
* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency-32
kHz, 44.1 kHz, 48 kHz).
TV, TAPE/CDR, DBS, VCR 87 dB/67 dB
Treble (10 kHz) ±10 dB ±2 dB
Composite video DBS IN, VCR IN 1 V(p-p)/75 Ω
S-video DBS IN, VCR IN (Y:luminance) 1 V(p-p)/75Ω
(C:chrominance) 0.286 V(p-p)/75 Ω
Composite video VCR OUT, MONITOR OUT 1 V(p-p)/75 Ω
S-video VCR OUT, MONITOR OUT (Y:luminance) 1.0 V(p-p)/75 Ω
(C:chrominance) 0.7 V(p-p)/75 Ω
Component video DVD COMPONENT VIDEO OUT (Component-Y) 1.0 V(p-p)/75 Ω
(Component-PB/PR) 0.7 V(p-p)/75 Ω
Color System NTSC/PAL
Horizontal Resolution 500 lines
Signal-to-Noise Ratio (S/N) 63 dB
Synchronize Negative
FM tuner (IHF)
AM tuner
530 kHz to 1 600 kHz (at 10 kHz intervals)
General
5 W (in standby mode)
1-2 (No.MB077)
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, 1,000
in the following manner. Connect a 1,500
paralleled by a 0.15
exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
Ω per volt or more sensitivity
Ω 10W resistor
µF AC-type capacitor between an
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.MB077)1-3
1.5 Preventing static electricity
1.5.1 Grounding to prevent damage by 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.
1.5.2 About the earth processing for the destruction prevention by static electricity
Static electricity in the work area can destroy the optical pickup (laser dio de) in devices such as DVD 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
Conductive material
(conductive sheet) or iron plate
1.5.3 Handling the optical pickup
(1) In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pick-
up are shorted. After replacement, return the shorted parts to their orig inal condition. (Refer to the text.)
(2) Do not use a tester to che ck the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.5.4 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) Remove solder of the short lands on the flexible wire after replacing the optical pickup. For specific details, refer to the replace-
ment 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 wire carefully as it may break when subjected to strong force.
(4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.5.5 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the DVD pickup.
• Apply solder to the short circuit points before the flexible wire is disconnected from the connector on the DVD pickup.
(If the flexible wire is disconnected without applying solder, the DVD pickup may be destroyed by static electri city.)
• In the assembly, be sure to remove solder from the short circuit points after connecting the flexible wire.
Flexible wire
Short land sections
DVD mechanism assembly
CN101
DVD servo board
1-4 (No.MB077)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB077)1-5
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the top cover
(See Fig.1)
(1) From the both sides of the main body, remove the four
screws A attaching the top cover.
(2) From the back side of the main body, remove the three
screws B attaching the top cover.
(3) Remove the top cover in the directi on of the arrow 2 w hile
extending the lower sections of the top cover in the direction of the arrow 1.
3.1.2 Removing the front panel assembly
(See Figs.2 to 4)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, disconnect the card wire
from the connector CN114
(2) Remove the screw C attaching the earth wire and sub
trans. Board. (See Fig.2.)
Reference:
When attaching the screw C, attach the earth wi res together with it.
(3) From the bottom side of the main bo dy, remove the five
screws D attaching the front panel assembly. (See Fig.3.)
(4) From the both side of the main body, release the two joints
a using a flat-bladed screwdriver and remove the front panel assembly in the direction of the arrow. (See Fig.4.)
on the main board. (See Fig.2.)
Ax2
D
Ax2
2
1
Top cover
B
1
Fig.1
Front panel assembly
Earth wire
C
Sub trans board
Front panel assembly
Fig.2
CN114
Main board
Fig.3
Front panel assembly
Joint a
Fig.4
1-6 (No.MB077)
3.1.3 Removing the rear panel
r
(See Fig.5)
• Prior to performing the following p rocedures, remove the top
cover.
(1) From the back side of the main body, remove the strain re-
lief from the rear panel in the direction of the arrow.
(2) Remove the twenty three screws E attaching the each
board to the rear panel.
(3) Remove the four screws F attaching the rear panel.
3.1.4 Removing the DSP board
(See Figs.6 and 7)
• Prior to performing the following p rocedures, remove the top
cover.
(1) From the back side of the main body, remove the four
screws G attaching the DSP board to the rear panel. (See
Fig.6.)
(2) From the top side of the main body, disconnect the DSP
board from the connector CN611
board. (See Fig.7.)
(3) From the left side of the main body, lift the DSP board in the
direction of the arrow and disconnect the card wire from the
connector CN602
(4) Take out the DSP board.
3.1.5 Removing the video jack board
(See Figs.6 and 7)
• Prior to performing the following p rocedures, remove the top
cover and DSP board.
(1) From the back side of the main body, remove the four
screws H attaching the video jack board. (See Fig.6.)
(2) Disconnect the card wire from the connector CN402
video jack board and take out the video jack board. (See
Fig.7.)
on the DSP board. (See Fig.7.)
on the DSP connector
on the
E
F
Rear panel
Rear panel
DSP board
F
Strain relief
FE E
Fig.5
Fig.6
E
F
G
HJ
CN611
CN602
Card wire
3.1.6 Removing the tuner
(See Figs.6 and 8)
• Prior to performing the following p rocedures, remove the top
cover, DSP board and video jack board.
(1) From the back side of the main body, remove the two
screws J attaching the tuner. (See Fig.6.)
(2) From the top side of the main bo dy, disconnect the card
wire from the connector CN1
(3) Take out the tuner.
on the tuner. (See Fig.8.)
Video jack
board
Card wire
CN402
Card wire
Fig.7
Fig.8
DSP connector
board
CN 1
Tune
(No.MB077)1-7
3.1.7 Removing the DAC board
(See Fig.9)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, disconnect the DAC
board from the connectors CN911
board.
and CN912 on the main
CN911
DAC board
3.1.8 Removing the amp. board
(See Fig.10)
• Prior to performing the following procedures, remove the top
cover and rear panel.
(1) From the top side of the main body, disconnect the wire
from the connector CN201
(2) Remove the screw K attaching the earth wire to the heat
sink barcket.
(3) Remove the four screws L attaching the amp. board.
(4) Disconnect the conne ctor CN202
(5) Lift the amp. board and disconnect the wire from the con-
nector CN231 on the main board.
(6) Disconnect the parallel wire from the connecto r CN241
the main board and take out the amp. board.
on the amp. board.
on the amp. board.
on
Main board
Heat sink bracket
L
K
CN241
Fig.9
Earth wire
CN231
Fig.10
CN912
CN201
CN202
Amp. board
Main board
3.1.9 Removing the heat sink
(See Fig.11)
• Prior to performing the following procedures, remove the top
cover, rear panel and amp. board.
(1) Remove the screw M attaching the H.sensor board.
(2) Remove the five screws N attaching the IC bracket, heat
sink bracket and heat sink.
1-8 (No.MB077)
Heat sink
Heat sink bracket
IC bracket
N
M
N
Fig.11
H. sensor board
N
Amp. board
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