JVC HX-C6 - Twin GIGA Tube Audio System User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB366
2005/6
COMPACT COMPONENT SYSYTEM
MB36620056
HX-C6
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
CA - H X C 6 SP - H X C 6
SP - H X C 6
Area suffix
J ---------------------------- U.S.A.

1-2 (No.MB366)
SPECIFICATION
Amplifier section-CA-HXC6
Speaker section-SP-HXC6
Design and specifications are subject to change without notice.
Output Power SUB WOOFER 170 W per channel, min. RMS, driven into 6 Ωat 63 Hz with no more than
10% total harmonic distortion.
MAIN SPEAKER 80 W per channel, min. RMS, driven into 4 Ωat 1 kHz with no more than
10% total harmonic distortion.
Audio input sensitivity/
impedance
AUX 400 mV/47 kΩ
USB USB Version 1.1
Speakers/impedance SUB WOOFER 6 Ω- 16 Ω
MAIN SPEAKER 4 Ω- 8 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
General Power requirement AC 120 V , 60 Hz
Power consumption 90 W/110 VA (at operation)
11 W (on standby; with power saving off-Normal mode)
1.2 W (on standby; with power saving on-Eco mode)
Dimensions (W/H/D) (approx.) 175 mm ×373 mm ×389 mm (6 15/16 in. ×14 11/16 in. ×15 3/8 in.)
Mass (approx.) 9.8 kg (21.6 lbs)
Type Speaker Systems Subwoofer 16 cm (6 5/16 in.) cone ×1
Woofer 16 cm (6 5/16 in.) cone ×1
Mid range 7 cm (2 13/16 in.) cone ×1
Tweeter 2 cm (13/16 in.) piezo ×1
Power handling capacity Subwoofer 340 (170 + 170) W
Main speaker 160 (80 + 80) W
Impedance Subwoofer 6 Ω
Main speaker 4 Ω
Frequency range Subwoofer 25 Hz - 1 000 Hz
Main speaker 50 Hz - 20 000 Hz
Sound pressure level Subwoofer 73 dB/W·m
Main speaker 82 dB/W·m
Dimensions (W/H/D) (approx.) 295 mm ×452 mm ×387 mm (11 5/8 in . ×17 13/16 in . ×15 1/4 in.)
Mass (approx.) 8.6 kg (19.0 lbs) each

(No.MB366)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.MB366)
1.5 Importance administering point on the safety
Caution: For continued protection against risk of fire,
replace only with same type 6.3 A/250 V for RFS1,
6.3 A/250 V for RFS05 and RFS06, 8 A/250 V for
RFS07 and RFS08, 5 A/250 V for RFS09.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de RFS1 comme le meme type
que 6,3 A/250 V, 6,3 A/250 V pour RFS05 et RFS06,
8 A/250 V pour RFS07 et RFS08, et 5 A/250V pour
RFS09.
Ce sont des fusibles suretes qui functionnes rapide.
^
P/T board (Forward side)
Main board (Forward side)
RFS1
RFS09
RFS06
RFS05
RFS07 RFS08

(No.MB366)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MB366)
SECTION 3
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 three
screws Aattaching the metal cover. (See Fig.1.)
(2) From the both sides of the main body, remove the six
screws Aattaching 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 ar-
row. (See Figs.2 and 3.)
Fig.1
Fig.2
Metal cover
A
A
A
Metal cover
A
A

(No.MB366)1-7
Fig.3
Metal cover
A
A

1-8 (No.MB366)
3.1.2 Removing the front panel assembly
(See Figs.4 to 7)
• Remove the metal cover.
(1) From the right side of the main body, remove the spacer fix-
ing the card wire and remove the card wire from the sec-
tions a. (See Fig.4.)
Reference:
When reassembling, pass the card wire through the sec-
tions aas before. (See Fig.4.)
(2) From the both sides of the main body, remove the four
screws Band two screws Cattaching the front panel as-
sembly. (See Figs.4 and 5.)
(3) From the top side of the main body, disconnect the card
wire from the connector FW101 on the FL board. (See
Fig.4.)
(4) Disconnect the wire from the connector AW102 on the am-
plifier board. (See Fig.6.)
(5) From the both and bottom sides of the main body, release
the joints (b, c) and remove the front panel assembly from
the main body in the direction of the arrow. (See Figs.4 to
7.)
Reference:
Remove the main board from the connectors (FW302, FW303,
FW304) on the volume board of the front panel assembly at
the same time. (See Fig.6.)
Fig.4
Fig.5
Front panel assembly
Spacer
b
a
C
B
Front panel assembly
b
C
B

(No.MB366)1-9
Fig.6
Fig.7
Front panel assembly
AW102
Amplifier board
FW303
FW304
FW302
Main board
Volume board
FW101
FL board
Front panel assembly
c

1-10 (No.MB366)
3.1.3 Removing the tuner
(See Figs.8 and 9.)
• Remove the metal cover.
(1) From the left side of the main body, disconnect the card
wire from the connector on the tuner. (See Fig.8.)
(2) From the back side of the main body, remove the two
screws Dattaching the tuner to the rear panel. (See Fig.9.)
Fig.8
Fig.9
Tuner
Connector
Rear panel
D
Tuner

(No.MB366)1-11
3.1.4 Removing the fan motor
(See Figs.10 and 11)
• Remove the metal cover.
(1) From the top side of the main body, disconnect the wire
from the connector FAN101 on the amplifier board. (See
Fig.10.)
(2) From the back side of the main body, remove the two
screws Eattaching the fan motor to the rear panel. (See
Fig.11.)
(3) Take out the fan motor from the main body.
Fig.10
Fig.11
Amplifier board
FAN101
Fan motor
Fan motor
E
Rear panel

1-12 (No.MB366)
3.1.5 Removing the rear panel
(See Fig.12)
• Remove the metal cover.
(1) From the back side of the main body, remove the twelve
screws Fattaching the rear panel.
(2) Remove the sections dtoward this side and remove the
rear panel.
Fig.12
3.1.6 Removing the amplifier board
(See Fig.13)
• Remove the metal cover and rear panel.
(1) From the top side of the main body, disconnect the wire of
the fan motor from the connector FAN101 on the amplifier
board.
(2) Disconnect the wire from the connector FAN102 on the
amplifier board and remove the wire from the slot e.
(3) Disconnect the wire from the connector AW102 on the am-
plifier board.
(4) Disconnect the parallel wire from the connector CW108 on
the amplifier board and remove the parallel wire from the
slot e.
(5) Disconnect the card wire from the connector AW101 on the
amplifier board and remove the card wire from the slot f.
(6) Remove the card wire of the tuner from the slot f.
Reference:
• Remove the tuner as required.
• When connecting the each wire, pass them through
the slots (e, f) as before.
(7) Remove the screw Gand take out the amplifier board from
the main body. Fig.13
Rear panel
FF
d
Amplifier board
FAN101
Card wire (for the tuner)
AW101
FAN102
CW108 AW102
G
e
f

(No.MB366)1-13
3.1.7 Removing the power amplifier ICs
(See Figs.14 to 16)
• Remove the metal cover, rear panel and amplifier board.
(1) From the forward side of the amplifier board, remove the
four screws Hand screw Jattaching the power amplifier
ICs to the heat sink. (See Figs.14 and 15.)
(2) From the reverse side of the amplifier board, remove the
three screws Kattaching the heat sink. (See Fig.16.)
(3) Remove the soldered sections (g, h, j) and remove the
power amplifier ICs from the forward side of the amplifier
board. (See Fig.16.)
Fig.14
Fig.15
Fig.16
Amplifier board
H
Heat sink
Power amplifier IC (AIC01)
Amplifier board
H J
Heat sink Power amplifier IC (PIC021)
Power amplifier IC (AIC02)
Amplifier board
K
g
j
h

1-14 (No.MB366)
3.1.8 Removing the 5CD changer mechanism assembly
(See Figs.17 to 22)
• Remove the metal cover, rear panel and amplifier board.
(1) From the top side of the main body, disconnect the card
wire from the connector FW101 on the FL board of the front
panel assembly. (See Fig.17.)
(2) Remove the spacer and remove the card wire from the sec-
tions kon the shield. (See Fig.17.)
(3) From the right side of the main body, remove the spacer
and remove the card wires from the sections mof the
shield. (See Fig.18.)
(4) From the both sides of the main body, remove the four
screws Mand remove the shield from the main body. (See
Figs.18 and 19.)
(5) From the both sides of the main body, remove the four
screws Nand remove the 5CD changer mechanism as-
sembly from the main body in the direction of the arrow.
(See Figs.20 and 21.)
(6) From the top side of the 5CD changer mechanism assem-
bly, remove the two screws Pand two screws Qand re-
move the base 1 and base 2. (See Fig.22.)
(7) From the bottom side of the 5CD changer mechanism as-
sembly, disconnect the wire from the connector CW104 on
the mechanism control board. (See Fig.22.)
Reference:
When the resolution of 5CD changer mechanism assembly is
done sequentially, release the claws n of the tray panel and re-
move the five tray panels from the 5CD changer mechanism
assembly. (See Fig.22.)
Note:
When releasing the claws n, take care not to break them. (See
Fig.22.)
Fig.17
Fig.18
Spacer
Shield
k
FW101
FL board
Front panel assembly
Shield
Spacer
m
m
M

(No.MB366)1-15
Fig.19
Fig.20
Fig.21
Fig.22
Shield
M
5CD changer mechanism assembly
N
5CD changer mechanism assembly
N
Base 2
Base 1
QP
QP
5CD changer
mechanism assembly
Tray panels
n
CW104
Mechanism
control board
n

1-16 (No.MB366)
3.1.9 Removing the power transformer
(See Fig.23)
• Remove the metal cover, rear panel, amplifier board and 5CD
changer mechanism assembly.
(1) From the top side of the main body, disconnect the wire
from the connector PW101 on the main board.
(2) Remove the three screws Rattaching the power transform-
er on the bottom chassis.
(3) Take out the power transformer.
3.1.10 Removing the main board
(See Figs.23 and 24)
• Remove the metal cover, rear panel, amplifier board and 5CD
changer mechanism assembly.
(1) From the top side of the main body, remove the screw Sat-
taching the earth wire on the bottom chassis. (See Fig.23.)
(2) From the forward side of the main board, disconnect the
wire from the connector PW101. (See Figs.23 and 24.)
(3) Disconnect the power cord from the connector PW103.
(See Fig.24.)
(4) Remove the screw Tattaching the main board. (See
Fig.24.)
(5) Disconnect the connectors (CW101, CW102, CW105) on
the main board from the front panel assembly in the direc-
tion of the arrow. (See Fig.24.)
Fig.23
Fig.24
3.1.11 Removing the FL board
(See Fig.25)
• Remove the metal cover and front panel assembly.
(1) Form the inside of the front panel assembly, remove the
four screws Uattaching the FL board.
(2) Take out the FL board from the front panel assembly and
disconnect the card wire from the connector FW102 on the
forward side of the FL board.
Fig.25
Earth wire Bottom chassis
Main board
Power transformer
PW101
S
R
Main board
PW101
PW103 CW101
CW102
CW105
Power cord
Front panel assembly
T
U
U
FW102 FL board
Front panel assembly

(No.MB366)1-17
3.1.12 Removing the switch board
(See Figs.26 and 27)
• Remove the metal cover, front panel assembly and FL board.
(1) From the front side of the front panel assembly, pull out the
preset knob in the direction of the arrow. (See Fig.26.)
(2) Form the inside of the front panel assembly, remove the six
screws Uattaching the switch board. (See Fig.27.)
(3) Take out the switch board from the front panel assembly
and disconnect the card wire from the connector FW201 on
the forward side of the switch board. (See Fig.27.)
3.1.13 Removing the volume and jack boards
(See Figs.26 and 28)
• Remove the metal cover and front panel assembly.
(1) From the front side of the front panel assembly, pull out the
volume knob in the direction of the arrow. (See Fig.26.)
(2) Disconnect the card wire from the connector FW301 on the
volume board. (See Fig.28.)
(3) Form the inside of the front panel assembly, remove the
ten screws Uattaching the volume and jack boards. (See
Fig.28.)
(4) Take out the volume board with the jack board from the
front panel assembly.
Reference:
When removing the jack board from the volume board, remove
the soldered sections pon the jack board as required. (See
Fig.28.)
Fig.26
Fig.27
Fig.28
Front panel assembly
Preset knob
Volume knob
U
FW201
Switch board
U
FW301
Volume board
U
U
Jack board
p
U

1-18 (No.MB366)
3.2 Speaker section
3.2.1 Removing the side panel assembly
(See Fig.1)
(1) From the side of the speaker main body, remove the four
screws Aattaching the side panel assembly.
(2) Insert the tip of a flat-bladed screwdriver or similar tool into
the space between the speaker main body and side panel
assembly, and lift the side panel assembly little by little to
remove the joint sections a.
Note:
To prevent damaging the side panel assembly and speaker
main body, insert cushioning plates etc. into the space be-
tween the speaker main body and side panel assembly.
Fig.1
A
A
a
a
Side panel assembly

(No.MB366)1-19
3.2.2 Removing the front panel assembly
(See Figs.2 and 3)
Reference:
Remove the side panel assembly as required.
(1) Insert the tip of a flat-bladed screwdriver or similar tool into
the space between the speaker main body and front panel
assembly, and lift the front panel assembly little by little to
remove the joint sections b. (See Fig.2.)
(2) From the inside of the front panel assembly, disconnect the
wires (blue and black wires) from the terminals on the
tweeter. (See Fig.3.)
3.2.3 Removing the tweeter
(See Fig.3)
• Remove the front panel assembly.
Reference:
Remove the side panel assembly as required.
(1) From the inside of the front panel assembly, remove the
wires (red and black wires) from the soldered sections con
the terminals of the tweeter.
(2) Remove the two screws B, take out the tweeter from the
front panel assembly.
Fig.2
Fig.3
b
b
b
b
Front panel assembly
Spacer
c
c
Blue wire
Black wire
Red wire
Black wire
BB
Tweeter
Terminals

1-20 (No.MB366)
3.2.4 Removing the top woofer
(See Fig.4)
• Remove the front panel assembly.
Reference:
Remove the side panel assembly as required.
(1) Remove the four screws Cattaching the top woofer.
(2) Take out the top woofer from the speaker main body and
disconnect the wires (blue/black and black wires) from the
terminal on the back side of the top woofer.
3.2.5 Removing the bottom woofer
(See Fig.4)
• Remove the front panel assembly.
Reference:
Remove the side panel assembly as required.
(1) Remove the four screws Cattaching the bottom woofer.
(2) Take out the bottom woofer from the speaker main body
and disconnect the wires (red and black wires) from the ter-
minal on the back side of the bottom woofer.
Fig.4
Blue/black
wire
Black
wire
Terminal
Terminal
Black
wire Red
wire
C
C
C
C
Top woofer
Bottom woofer