JVC HXGX-7 Service manual
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB16120043
HX-GX7
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada
CA-HXGX7 SP-HXGX7SP-HXGX7
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MB161
2004/3
SPECIFICATION
Amplifier section-CA-HXGX7
Output Power
SUBWOOFERS 180 W per channel, min. RMS, driven into 6 Ω at 63 Hz with no more than 10 %total
harmonic distortion.
MAIN SPEAKERS 80 W per channel, min. RMS, driven into 6 Ω at 1 kHz with no more than 10 %total
harmonic distortion.
Audio input sensitivity/impedance (Measured at 1 kHz, with tape recording signal 300 mV)
AUX 300 mV/47 kΩ
Speakers/impedance SUBWOOFERS 6 Ω - 16 Ω
MAIN SPEAKERS 6 Ω - 16 Ω
Tuner
FM tuning range 87.5 MHz - 108.0 MHz
AM tuning range 530 kHz - 1 710 kHz
CD player
CD capacity 5 discs
Dynamic range 87 dB
Signal-to-noise ratio 90 dB
Wow and flutter Immeasurable
MP3 recording format MPEG 1/2 Audio Layer 3
Max. Bit rate 320 kbps
Cassette deck
Frequency response Normal (type I) 50 Hz - 14 000 Hz
Wow and flutter 0.15 % (WRMS)
General
Power requirement AC 120 V , 60 Hz
Power consumption 245 W/310 VA (at operation) 26 W (on standby)
Dimensions (approx.) 205 mm × 370 mm × 432 mm (W/H/D) (8 1/8 in. × 14 5/8 in. × 17 1/0 16 in.)
Mass (approx.) 10.5 kg (23.2 lbs)
Speaker section-SP-HXGX7
Type 3-Way 4-Speaker Bass-Reflex Type
Speaker Systems Subwoofer 16 cm (6 5/16 in.) cone × 1
Woofer 12 cm (4 3/4 in.) cone × 2
Tweeter 5 cm (2 in.) cone × 1
Power handling capacity Subwoofer 360 (180 + 180) W
Main speaker 160 (80 + 80) W
Impedance Subwoofer 6 Ω
Main speaker 6 Ω
Frequency range Subwoofer 27 Hz - 1000 Hz
Main speaker 70 Hz - 25 000 Hz
Sound pressure level Subwoofer 78 dB/W·m
Main speaker 88 dB/W·m
Dimensions (approx.) 227 mm × 432 mm × 376 mm (W/H/D) (8 15/16 in. × 17 1/16 in. × 14 13/16 in.)
Mass (approx.) 8 kg (17.7 lbs) each
Design and specifications are subject to change without notice.
1-2 (No.MB161)
SECTION 1
PRECAUTION
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 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.).
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 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 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.MB161)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 diode) in devices such as laser products.
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.
(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 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 pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
wire is disconnected without applying solder, the 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.
Short round
Card wire
1-4 (No.MB161)
Pickup
Flexible board
1.8 Importance administering point on the safety
F102
F101
8A-125V
8A-125V
3.15A-125V
F104
F001
6.3A-125V
Caution: For continued protection against risk of
fire, replace only with same type 6.3 A/125 V for
F001, 8 A/125 V for F101 and F102, 3.15 A/125 V
for F104.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F001 comme le meme type
que 6,3 A/125 V, 8 A/125 V pour F101 et F102, et
3.15 A/125 V pour F104.
Ce sont des fusibles suretes qui functionnes rapide.
^
(No.MB161)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MB161)
SECTION 3
r
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the metal cover
(See Figs.1 to 3)
(1) From the back side of the main body, remove the six
screws A attaching the metal cover. (See Fig.1.)
(2) From the both sides of the main body, remove the two
screws B attaching the metal cover. (See Figs.2 and 3.)
(3) Remove the metal cover from the main body while lifting
the rear section of the metal cover in the direction of the arrow. (See Figs.2 and 3.)
Metal cover
A
A
Metal cover
A
Fig.1
B
Fig.2
Metal cove
B
Fig.3
(No.MB161)1-7
3.1.2 Removing the front panel assembly
(See Figs.4 to 7)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the right side of the main body, disconnect the card
wires from the connectors (CN43
on the main board. (See Fig.4.)
(2) Disconnect the earth wire from the chassis base. (See
Fig.4.)
(3) From the top side of the main body, disconnect the parallel
wires from the connectors (CN201
board. (See Fig.5.)
Reference:
When reassembling, pass the parallel wire through the
hole a on the plastic chassis before connecting the parallel wire to the connector CN201
(See Fig.5.)
(4) Disconnect the earth wire from the chassis base. (See
Fig.6.)
(5) From the both sides of the main body, remove the two
screws C attaching the front panel assembly. (See Figs.4
and 6.)
(6) From the bottom side of the main body, remove the three
screws D attaching the front panel assembly. (See Fig.7.)
(7) Release the joints b of the front panel assembly from the
chassis base and remove the front panel assembly in the
direction of the arrow. (See Figs.4,6 and 7.)
Front panel assembly
Card wires
, CN44, CN802, CN803)
, CN205) on the bridge
on the bridge board.
Main board
CN802
Bridge board
CN201
Parallel wire
Parallel wire
CN205
Parallel wire
a
Plastic chassis
Fig.5
Front panel assembly
C
Earth wire
b
Card wires
Fig.4
CN43
CN44
CN803
Chassis base
Chassis base
Front panel assembly
D
C
b
Earth wire
Fig.6
b
1-8 (No.MB161)
Fig.7
Chassis base
b
3.1.3 Removing the tuner
(See Figs.8 and 9.)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the right side of the main body, disconnect the card
wire from the connector CN560
Fig.8.)
(2) From the back side of the main body, remove the two
screws E attaching the tuner to the rear panel. (See Fig.9.)
on the main board. (See
CN560
Tuner Main board
Fig.8
Card wires
E
Rear panel
Fig.9
(No.MB161)1-9
3.1.4 Removing the rear panel
r
(See Figs.10 to 12)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, disconnect the wire
from the connector CN202
Fig.10.)
(2) From the back side of the main body, remove the screw F
and two screws G attaching the rear cover. (See Fig.11.)
(3) Release the sections d and remove the rear cover. (See
Fig.11.)
(4) Remove the screw H and eleven screws J attaching the
rear panel. (See Fig.12.)
(5) From the both sides of the main body, release the joints e
attaching the rear panel to the chassis base and remove
the rear panel with the fan. (See Fig.12.)
3.1.5 Removing the fan
(See Figs.10 to 12)
• Prior to performing the following procedures, remove the metal
cover.
(1) From the top side of the main body, disconnect the wire
from the connector CN202
Fig.10.)
(2) From the back side of the main body, remove the screw F
and two screws G attaching the rear cover. (See Fig.11.)
(3) Remove the two screws K attaching the fan. (See Fig.12.)
(4) Take out the fan from the main body.
on the bridge board. (See
on the bridge board. (See
Bridge board
CN202
Fig.10
G
F
d
Rear panel
J
Fan
J
d
d
Fig.11
Rear cove
J
K
HK
J
1-10 (No.MB161)
J
ee
Fig.12
3.1.6 Removing the main board
(See Figs.13 and 14)
• Prior to performing the following procedures, remove the metal
cover and rear panel.
Reference:
Remove the tuner as required.
(1) From the right side of the main body, disconnect the card
wires from the connectors (CN43
CN803) on the main board. (See Fig.13.)
(2) Remove the two screws L attaching the main board. (See
Fig.14.)
(3) Disconnect the connector CN217
ward this side and disconnect the connector CN501
main board in the direction of the arrow. (See Fig.14.)
Reference:
• When attaching the main board, insert the sections f of the
bridge board in the hole of the main board. (See Fig.14.)
• Insert the section g of the main board in the hole of the chassis base before attaching the screws L.
, CN44, CN661, CN802,
on the main board to-
on the
Card wires
Card wires
Bridge board
CN802
CN44
Fig.13
f
Main board
CN803
CN661
CN43
Main board
L
CN217
L
f
CN501
Main board
g
Chassis base
Fig.14
(No.MB161)1-11
3.1.7 Removing the main amplifier board/subwoofer amplifier boards
(See Figs.15 to 17)
• Prior to performing the following procedures, remove the metal
cover, rear panel and main board.
(1) From the top side of the main body, disconnect the wires
from the connector (CN206
(See Fig.15.)
(2) From the back side of the main body, disconnect the con-
nectors (CN600
amplifier boards from the connection board in the direction
of the arrow. (See Fig.16.)
(3) From the side of the main amplifier/subwoofer amplifier
boards, remove the tie band bundling the wires. (See
Fig.17.)
Reference:
After reassembling, bundle the wires with the tie band.
(See Fig.17.)
(4) Remove the two screws M and screw N attaching the main
amplifier board. (See Fig.17.)
(5) Removing the two screws P and screw Q attaching the
subwoofer amplifier board. (See Fig.17.)
, CN700) on the main amplifier/subwoofer
, CN208) on the bridge board.
Bridge board
Wires
CN206CN208
Fig.15
Main amplifier board
Subwoofer amplifier board
Heat sink
Connection board
Tie band
P
Q
CN606 CN700
Fig.16
Wires
M
N
1-12 (No.MB161)
Subwoofer amplifier board
Fig.17
Main amplifier board
3.1.8 Removing the connection board
r
(See Fig.18.)
• Prior to performing the following procedure, remove the metal
cover, rear panel, main board and main amplifier/subwoofer
amplifier boards.
(1) From the top side of the main body, remove the two screws
R attaching the connection board on the chassis base.
Reference:
When reassembling, attach the connection board to the section h and align the projection i of the chassis base to the hole
of the connection board.
R
Connection board
h
i
3.1.9 Removing the bridge board
(See Figs.19 and 20)
• Prior to performing the following procedures, remove the metal
cover, rear panel and main board.
(1) From the top side of the main body, disconnect the wires
from the connectors (CN206
bridge board. (See Fig.19.)
Reference:
After connecting the wire to the connector CN214
wire with the wire holder. (See Fig.19.)
(2) Disconnect the parallel wires from the connectors (CN201,
, CN213) on the bridge board. (See Fig.19.)
CN205
(3) Remove the two screws S attaching the bridge board on
the 5CD changer mechanism assembly. (See Fig.20.)
(4) Bend the claw j in the direction of the arrow and remove the
bridge board in an upward direction. (See Fig.20.)
Reference:
• When attaching the bridge board, align the projections (k,m)
in the hole of the bridge board. (See Fig.20.)
• When reassembling, pass the wires through the sections (n,
p) of the plastic chassis. (See Fig.19.)
, CN208, CN214) on the
, fix the
Chassis base
Wires
CN206
CN208
Fig.18
Bridge board
CN205
CN213CN201
Fig.19
mk
S
R
n
Bridge board
Parallel wire
CN214
p
Wire holder
S
j
Fig.20
5CD change
mechanism
assembly
(No.MB161)1-13
3.1.10 Removing the 5CD changer mechanism assembly
(See Figs.21 and 23)
• Prior to performing the following procedures, remove the metal
cover, rear panel, main board and bridge board.
(1) From the both sides of the main body, remove the two
screws T attaching the 5CD changer mechanism assembly
to the front panel assembly. (See Figs.21 and 22.)
(2) Take out the 5CD changer mechanism assembly from the
main body.
Reference:
When attaching the 5CD changer mechanism assembly,
pass the wires through the sections (n, p) of the plastic
chassis. (See Fig.22.)
(3) From the both and top sides of the 5CD changer mecha-
nism assembly, remove the two screws U and screw V attaching the main chassis. (See Fig.23.)
(4) From the top side of the 5CD changer mechanism assem-
bly, remove the three screws W and screw X attaching the
5CD changer mechanism assembly on the plastic chassis.
Reference:
• When reassembling, align the projections (q,r,s) of the plastic chassis to the holes of the 5CD changer mechanism assembly before attaching the screws W and X. (See Fig.23.)
• Align the projections t of the plastic chassis to the holes of
the main chassis before attaching the screw V. (See Fig.23.)
Front panel assembly
5CD changer mechanism assembly
T
Fig.21
Front panel assembly
5CD changer mechanism assembly
Wires
n
5CD changer
mechanism assembly
W
Main chassis
W
s
W
Fig.22
U
U
Fig.23
T
p
Plastic chassis
t
V
t
r
q
W
Earth wire
X
1-14 (No.MB161)
3.1.11 Removing the primary board
Y
Y
(See Figs.19,21,22,24 and 25)
• Prior to performing the following procedures, remove the metal
cover, rear panel and main board.
(1) From the top side of the main body, disconnect the wires
from the connectors (CN206
bridge board. (See Fig.19.)
Reference:
After connecting the wire to the connector CN214
wire with the wire holder. (See Fig.19.)
(2) Disconnect the parallel wires from the connectors (CN201
CN205, CN213) on the bridge board. (See Fig.19.)
(3) From the both sides of the main body, remove the two
screws T attaching the 5CD changer mechanism assembly
to the front panel assembly. (See Figs.21 and 22.)
Reference:
It is not necessary to remove the bridge board from the
5CD changer mechanism assembly.
(4) Take out the 5CD changer mechanism assembly with the
bridge board from the main body.
Reference:
When attaching the 5CD changer mechanism assembly,
pass the wires through the sections (m, n) of the 5CD
changer mechanism assembly. (See Fig.22.)
(5) From the top and left sides of the main body, remove the
four screws Y and screw Z attaching the primary board on
the chassis base. (See Figs.24 and 25.)
(6) From the forward side of the primary board, disconnect the
power cord from the connector CN200
, CN208, CN214) on the
, fix the
. (See Fig.25.)
Primary board
,
Chassis base
Fig.24
Primary board
CN200
3.1.12 Removing the FL board
(See Fig.26)
• Prior to performing the following procedures, remove the metal
cover and front panel assembly.
(1) From the inside of the front panel assembly, remove the
soldered sections (u, v) on the FL board to remove the parallel wires.
(2) Disconnect the card wire from the connector CN902
FL board.
(3) Remove the four screws AA attaching the FL board.
Reference:
When attaching the FL board, align the projections w of the
front panel assembly in the holes of the FL board before attaching the screws AA.
on the
Z
Front panel assembly
w
u
Parallel wire
AA
Card wire
Chassis basePower cord
Fig.25
FL board
CN902
Fig.26
AA
Parallel wire
w
AAAA
v
(No.MB161)1-15
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