JVC RX-7030VBK Service Manual
SERVICE MANUAL
CONTROL
AUDIO /VIDEO CONTROL RECEIVER
2205820035
RX-7030VBK
A/V CONTROL RECEIVER
231
MENU
564
ENTER
7/P
89
+10
10/0
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Area Suffix
J ------------------ U.S.A.
C --------------- Canada
TABLE OF CONTENTS
1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 4
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.22058
2003/5
SPECIFICATION
At Stereo operation Front ch
Amplifier Output Power
At Surround
operation
Audio Input Sensitivity/Impedance (1
kHz)
Audio Input
(DIGITAL IN)*
Audio Output Level SUBWOOFER OUT : 1V
Recording Output Level VCR OUT, TAPE/CDR OUT : 200 mV
Digital output Optical : DIGITAL OUT
Audio
Video
FM tuner
(IHF)
AM tuner Tuning Range 530 kHz to 1 710 kHz
General
Signal wave length 660 nm
Output level -21 dBm to -15 dBm
Signal-to-Noise Ratio (‘66 IHF/’78 IHF) DVD IN, VCR IN, TV SOUND/DBS IN 87 dB/80 dB
CD IN TAPE/CDR IN 87 dB/80 dB
Frequency Response (8Ω at 1 kHz, with no more than 0.8% total harmonic
distortion.) DVD IN, VCR IN, TV SOUND/DBS IN
CD IN, TAPE/CDR IN 20 Hz to 100 kHz (+1 dB, -3 dB)
Equalization (5 bands) 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz (±8 dB)
Bass boost +6 dB ±1.0 dB at 100 Hz
Video Input Sensitivity/Impedance Composite video DVD IN, VCR IN, TV SOUND/DBS IN 1 V(p-p)/75Ω
S-video
Component video DVD IN, DBS IN
Video Output Level Composite video VCR OUT, MONITOR OUT 1 V(p-p)/75Ω
S-video
Component video MONITOR OUT
Synchronization Negative
Signal-to-Noise Ratio 45 dB
Tuning Range 87.5 MHz to 108.0 MHz
Usable Sensitivity Monaural 12.8 dBf (1.2 µV/75Ω)
50 dB Quieting Sensitivity
Stereo Separation at REC OUT 35 dB at 1 kHz
Power Requirements AC 120V ~ 60 Hz
Power Consumption 320 W/440 VA (at operation) 2 W (in standby mode)
Dimensions (W x H x D) 435 mm x 157 mm x 425 mm (17 3/16 in. x 6 3/16 in. x 16 3/4 in.)
Mass 12.1 kg (26.7 lbs)
DVD IN, VCR IN, TV SOUND/DBS IN 200 mV/47 kΩ
CD IN, TAPE/CDR IN 200 mV/47 kΩ
Coaxial DIGITAL 1 (DVD) : 0.5 V(p-p)/75 Ω
Optical
DVD IN, VCR IN,
TV SOUND/DBS IN
VCR OUT,
MONITOR OUT
Monaural 16.0 dBf (1.7 µV/75Ω)
Stereo 37.5 dBf (20.5 µV/75Ω)
110 W per channel, min. RMS, driven into
8Ω, 20 Hz to 20 kHz, with no more than
0.08% total harmonic distortion.
110 W per channel, min. RMS, driven into 8Ω
Front ch
Center ch
Surround ch
Surround Back ch
DIGITAL 2 (CD), DIGITAL 3 (TV), DIGITAL 4 (CDR) :
-21 dBm to -15 dBm (660 nm ±30 nm)
(Y: luminance) 1 V(p-p)/75Ω
(C: chrominance, burst) 0.286 V(p-p)/75Ω
(Y: luminance) 1 V(p-p)/75Ω
(PB/PR): 0.7 V(p-p)/75Ω
(Y: luminance) 1 V(p-p)/75Ω
(C: chrominance, burst) 0.286 V(p-p)/75Ω
(Y: luminance) 1 V(p-p)/75Ω
(PB/PR) 0.7 V(p-p)/75Ω
at 1 kHz, with no more than 0.8% total
harmonic distortion.
110 W, min. RMS, driven into 8Ω at 1 kHz,
with no more than 0.8% total harmonic
distortion.
110 W per channel, min. RMS, driven into 8Ω
at 1 kHz, with no more than 0.8% total
harmonic distortion.
110 W, min. RMS, driven into 8Ω at 1 kHz,
with no more than 0.8% total harmonic
distortion.
20 Hz to 100 kHz (+1 dB, -3 dB)
* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz).
Designs & specifications are subject to change without notice
1-2 (No.22058)
SECTION 1
Precautions
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 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 0.5µ
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 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 comp onents 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.22058)1-3
SECTION 2
Disassembly method
2.1 Removing the top cover (See Fig.1)
(1) From the right and left 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 to p cover in the di recti on of th e arrow 2 w hile
extending the lower sections of the top cover in the direction of the arrow 1.
2.2 Removing the front panel assembly (See Figs.2 and 3)
• Prior to performing the following procedures, remove the top
cover.
(1) Disconnect the card wire from the connector CN400 on the
micon board. (See Fig.2.)
(2) Disconnect the card wire from the connector CN402 on the
power supply board. (See Fig.2.)
(3) Remove the tie band and wire protection board fi xing the
card wire. (See Fig.2.)
(4) Remove the three screws C attaching the front panel as-
sembly. (See Fig.2.)
(5) From the bottom side of th e main body, remove the four
screws D attaching the front panel assembly. (See Fig.3.)
(6) Remove the front panel assembly in the direction of the ar-
row. (See Fig.3.)
Top cover
Tie band
Wire
protection
board
Card
wire
CN400
Micon
board
A
1
Front panel assembly
C
2
Fig.1
CN402
C C
Card wire
B
A
1
Power
supply
board
1-4 (No.22058)
Fig.2
Front panel assembly
DD
Fig.3
2.3 Removing the rear panel
1
(See Fig.4)
• Prior to performing the following procedures, remove th e 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-nine screws E, two screws F and three
screws G attaching the rear panel.
E
E
F
E
Strain relief
2.4 Removing the I/O board
(See Fig.5)
• Prior to performing the following procedures, remove th e top
cover and rear panel.
(1) Remove the two plastic ri vets in the direction of the arrow
1 from the top side of the main body, remove the stopper
boards in the direction of the arrow 2.
(2) Remove the tie bands bundling the wires.
(3) Disconnect the wire from the connector CN722 on the cen-
ter board.
(4) Disconnect the wire from the connector CN714 on the front
board(L).
(5) Disconnect the wire from the connector CN717 on the sur-
round back board.
(6) Disconnect the wire from the connector CN719 on the front
board(R).
(7) Disconnect the wire from the connector CN723 on the main
board.
(8) Disconnect the connectors (CN205,CN381,C N501) on the
I/O board in an upward direction.
G
Front board(R)
CN719
Main
board
CN723
Plastic
rivet
CN501
Stopper
board
CN381
CN205
Stopper board
Rear panel
Front board(L)
Surround board
CN717
22
22
11
1
1
Plastic rivet
GE
Fig.4
Fig.5
CN714
G
E
Center board
Tie band
CN722
Tie bands
I/O board
(No.22058)1-5
2.5 Removing the tuner, DSP board, audio board, video board and S-video board
r
(See Fig.6)
• Prior to performing the following procedures, remove the top
cover, rear panel and I/O board.
(1) Disconnect the card wire from the connector CN314 on the
audio board from the top side of the main body, take out the
tuner.
(2) (2) Disconnect the DSP board from the connector CN601
on the micon board.
(3) Disconnect the audio board from the connectors
(CN101,CN303) on the micon board.
(4) Disconnect the video bo ard from the connector CN201 on
the micon board.
(5) Disconnect the S-video b oard from the connector CN241
on the micon board.
CN314
CN303
CN101
DSP board
Card wire
CN201 CN241
Tune
2.6 Removing the micon board
(See Fig.7)
• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board, tuner, DSP board, audio board,
video board and S-video board.
(1) From the top side of the main body, disconnect the card
wire from the connector CN400 on the micon board.
(2) Disconnect the relay board from the connecto rs CN81 on
the micon board.
(3) Disconnect the parallel wire from th e connectors CN931
and CN932 on the micon board.
(4) Disconnect the parallel wire from the conn ecto r CN831 on
the main board.
(5) Remove the three screws H attaching the micon board.
(6) Remove the three screws J attaching the transistors
(Q921,Q931,Q941) to the chassis base.
(7) Loosen the screw K attaching the micon board.
CN601
Audio board
Card
wire
H
CN400
H
Micon board
Transistors
(Q921,Q931,Q941)
Video board
J
Fig.6
CN831
H
Fig.7
Micon board
S-video board
CN931
CN932
Main board
Relay
board
K
Chassis
base
CN81
1-6 (No.22058)
2.7 Removing the speaker board (See Fig.8)
• Prior to performing the following procedures, remove th e top
cover and rear panel.
(1) From the top side of the ma in body, remove the tie band
bundling the wires.
(2) Disconnect the wires from the connectors (CN813,CN814)
on the main board.
(3) Disconnect the parallel wire from the connectors
(CN931,CN932) on the micon board.
(4) Take out the speaker board in the direction of the arrow.
Micon board
Main board
Tie band
CN931
CN932
2.8 Removing the main board (See Fig.9)
• Prior to performing the following procedures, remove th e top
cover.
(1) From the top side of the main body, remove the tie bands
bundling the wires.
(2) Remove the tie band and wire protection board bu ndling
the card wire.
(3) Disconnect the wire from the connector CN811 on the pow-
er transformer board 1.
(4) Disconnect the relay board from the connectors (CN71,
CN81) on the power supply board and micon board.
(5) Disconnect the parallel wires from the connectors
(CN831,CN881) on the main board.
(6) Disconnect the wires from the connectors
(CN723,CN813,CN814) on the main board.
(7) Disconnect the wire from the connector CN722 on the cen-
ter board.
(8) Disconnect the wire from the connector CN714 on the front
board(L).
(9) Disconnect the wire from the connector CN717 on the sur-
round back board.
(10) Disconnect the wire from the connector CN719 on the front
board(R).
(11) Remove the screw K, five screws L, screw M and two
screws N attaching the main board.
(12) Take out the main board.
CN814
Front board(R)
L
Tie band
Wire
protection
board
M
Card wire
N
Main
board
CN723
CN814
Micon board
Heat sink
CN813
CN881
CN719
Surround
board
CN717
CN831
Fig.8
Front board(L)
Tie
band
CN714
N
CN813
Fig.9
Speaker board
Center board
CN811
L
CN71
CN722
Power
supply
board
Power
transformer
board 1
Tie bands
Relay board
K
CN81
Q
Fig.11
Q
(No.22058)1-7
2.9 Removing the heat sink (See Figs.10 and 11)
• Prior to performing the following procedures, remove the top
cover and main board.
(1) From the reverse side of the main board, remove the two
screws P attaching the main board to the heat sink. (See
Fig.10.)
(2) Disconnect the co nnectors (CN701-CN706) on the main
board, remove the main board. (See Fig.10.)
(3) Remove the twelve screws Q attaching the heat sink. (See
Fig.11.)
P
CN703
Heat sink
CN701
CN704
CN702
Fig.10
Main board
P
CN706
CN705
Heat sink
Fig.11
2.10 emoving the center board, surround back board, front amp. boards (L/R ) and rear amp. boards (L/R) (See Figs.10 and 12)
• Prior to performing the following procedures, remove the top
cover and main board.
(1) From the reverse side of the main board, remove the two
screws P attaching the main board to the heat sink. (See
Fig.10.)
(2) Disconnect the co nnectors (CN701-CN706) on the main
board, remove the main board. (See Fig.10.)
(3) Remove the two screws Q attaching the center board. (See
Fig.12.)
(4) Remove the two screws Q attaching the front board(L).
(See Fig.12.)
(5) Remove the two screws Q attaching the surround back
board. (See Fig.12.)
(6) Remove the two screws Q attaching the front board(R).
(See Fig.12.)
(7) Remove the two screws Q attaching the surround board(L).
(See Fig.12.)
(8) Remove the two screws Q attaching the surround
board(R). (See Fig.12.)
Surround board(R)
Front board(R)
Front board(L)
Q Q Q Q Q Q
Surround board
Surround board(L)
Fig.12
Q
Q
Center board
1-8 (No.22058)
2.11 Removing the power transformer
r
(See Fig.13)
• Prior to performing the following procedures, remove th e top
cover.
(1) From the top side of the ma in body, remove the tie band
bundling the wires.
(2) Disconnect the wire from the connectors (CN55,CN811) on
the power transformer board 1.
(3) Remove the solders from the soldered sections a on the
power transformer board 2.
(4) Remove the four screws R attachin g the powe r tra nsfo rm-
er.
2.12 Removing the power/fuse board
(See Fig.13)
• Prior to performing the following procedures, remove th e top
cover.
(1) From the back and top sides of the main body, remove the
screw S and screw T attaching the power/fuse board.
(2) Remove the solders from the soldered sections b attaching
the power cord.
(3) From the reverse side of the power/fuse board, remove the
solders from the soldered sections c attaching the wires.
Tie band
Soldered
sections a
CN811
CN55
Power
transformer
board 1
Power
transformer
RR
Power
transforme
board 2
T
Soldered
sections b
Soldered sections c
Power/fuse board
Power cord
S
Fig.13
(No.22058)1-9
2.13 Removing the power supply board (See Fig.14)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, disconnect the parallel
wires from the connector CN55 on the power transformer
board 1.
(2) Disconnect the card wire from the connector CN402 on the
power supply board.
(3) Disconnect the relay board from the conn ector CN71 on
the power supply board.
(4) Remove the three screws U attaching the power supply
board.
(5) Remove the power sup ply board from the hook d of the
chassis base bracket in the direction of the arrow, take out
the power supply board.
(6) Turn over the power supply board, remove the solders from
the soldered sections e attaching the wires.
CN881
Tie bands
Main board
CN71
CN402
Card wire
U
Power supply board
Headphone jack
CN55
board
Soldered
sections e
Power
transformer
board 1
U
U
2.14 Removing the headphone jack board (See Figs.14 and 15)
• Prior to performing the following procedures, remove the top
cover and front panel assembly.
(1) From the top side of the main body, remove the tie bands
attaching the parallel wire. (See Fig.14.)
(2) Disconnect the parallel wire from the conn ecto r CN881 on
the main board. (See Fig.14.)
(3) From the front side of the main b ody, remove the nut and
screw V attaching the headphone bracket to the front
bracket. (See Fig.15.)
(4) Remove the three screws U attaching the power supply
board. (See Fig.14.)
(5) Take out the headpho ne jack board from the inside of the
chassis base while lifting the power supply board.
Relay board
Nut
Headphone bracket
Hook d of the chassis
base bracket
Fig.14
V
Headphone jack board
Front bracket
Fig.15
1-10 (No.22058)
2.15 Removing the switch board
Y
(See Fig.16)
• Prior to performing the following procedures, remove th e top
cover and front panel assembly.
(1) From the back side of the front panel assembly, remove the
two screws W attaching the switch board.
(2) Take out the switch board, disconnect the wire from the
connector CN432 on the switch board.
2.16 Removing the power switch board
(See Fig.16)
• Prior to performing the following procedures, remove th e top
cover and front panel assembly.
(1) From the back side of the front panel assembly, remove the
two screws X attaching the power switch board.
(2) Take out the power switch board, disconnect the wire from
the connector CN430 on the power switch board.
2.17 Removing the front key & system control board
(See Figs.17 to 20)
• Prior to performing the following procedures, remove th e top
cover, front panel assembly, switch board and power switch
board.
(1) Pull out the volume and jog knobs from the front side of the
front panel assembly, remove the nut attaching the front
key & system control board. (See Fig.17.)
(2) From the back side of the front panel assembly, remove the
eight screws Y attaching the sub panel assembly. (See
Fig.18.)
(3) Remove the sub panel assembly while releasing the claws
f in the direction of the arrow. (See Figs.18 and 19.)
(4) Release the claws g attaching the front key & system con-
trol board in the direction of the arrow and take out the front
key & system control board. (See Fig.20.)
Front panel assembly
Volume knob
W
CN432
Switch board
W
Y
Claws f Claws f
Sub panel assembly
Front panel assembly
Power switch board
Fig.16
Front panel assembly
Sub panel assembly
Fig.18
Front panel assembly
CN430
X
Fig.19
Front panel assembly
Front key & System control board
Nut
Jog knob
Fig.17
Claws g
Fig.20
(No.22058)1-11
SECTION 3
Adjustment
3.1 Adjustment method Tuner section
1. Tuner range
FM 87.5 MHz to 108.0MHz
AM 530kHz to 1710kHz
Power amplifier section
Adjustment of idling current
Measurement location B2204-B2205 (Lch), B2213-B2214 (Rch)
Adjustment part VR787 (Lch), VR788 (Rch)
Attention:
This adjustment does not obtain a correct adju stment value i mmediately after the amplifier is used (state that an in ternal temperature has risen).
Please adjust, after you turn off amplifier and internal temperature falls.
<Adjustment method>
(1) Set the volume control to minimum during this adjustment. (No signal & No load)
(2) Set the surround mode OFF.
(3) Turn VR787 and VR788 fully counterclockwise to warm up before adjustment.
If the heat sink is already warm from previous use the correct adjustment can not be made.
(4) For L-ch, connect a DC voltmeter between B2204 and B2205 (Lch) and, connect it between B2213 and B2214 (Rch).
(5) 30 minutes later after power on, adjust VR787 for Lch, or VR788 for Rch so that the DC voltmeter value has 1mV to 10mV.
• It is not abnormal though the idling current might no t become 0mA even if it i s finished to turn variable resistance (VR787,
VR788) in the direction of counterclockwise.
Front amp. board (L)
VR787
B2204
B2205
Front amp. board (R)
VR788
B2213
B2214
VR787 (Lch)
B2204, B2205 (Lch)
VR788 (Rch)
B2213, B2214 (Rch)
1-12 (No.22058)
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