JVC HX-D7 Diagram
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB45520058
HX-D7
Area suffix
UJ ---------------------- U.S.Military
SP-HXD7
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
CA-HXD7 SP-HXD7
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.MB455
2005/8
SPECIFICATION
CA-HXD7
Amplifier section Output Power SUBWOOFER 135 W per channel, min. RMS, driven into 6 Ω at 63 Hz with no more than
10% total harmonic distortion. (IEC268-3)
MAIN SPEAKER 60 W per channel, min. RMS, driven into 4 Ω at 1 kHz with no more than
10% total harmonic distortion. (IEC268-3)
Audio input sensitivity/impedance AUX:400 mV/47 kΩ
USB:USB Version 1.1
Digital output DIGITAL OUTPUT (OPTICAL):-21 dBm to -15 dBm (660 nm ±30 nm)
VIDEO OUT Color system:NTSC
VIDEO (composite) 1 V(p-p)/75 Ω
S-VIDEO Y (luminance):1 V(p-p)/75 Ω
C (chrominance, burst):0.286 V(p-p)/75 Ω
COMPONENT(interlace/ progressive) (Y):1 V(p-p)/75 Ω
(PB/PR):0.7 V(p-p)/75 Ω
Speaker Terminals 4 Ω - 8 Ω (main speakers)
6 Ω - 16 Ω (subwoofers)
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM tuning range 531 kHz - 1 710 kHz (at 9 kHz interval)
530 kHz - 1 710 kHz (at 10 kHz interval)
Disc player section Playable disc DVD Video/DVD Audio
CD/VCD/SVCD
CD-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD/MP3/
JPEG format)
DVD-R/DVD-RW (recorded in video format)
Dynamic range 90 dB
Horizontal resolution 500 lines
Wow and flutter Immeasurable
General Power requirement AC 110 V - AC 127 V/ AC 220 V - AC 240 V (adjustable with the voltage
selector), 50/60 Hz
Power consumption 160 W (at operation)
30 W (on standby)
Dimensions (approx.) 175 mm × 373 mm × 389 mm (W/H/D)
Mass (approx.) 10.1 kg
Speaker section-SP-HXD7
Type 4-Way Front Twin Woofer (Magnetically Shielded Type)
Speakers Subwoofer 16 cm cone × 1
Woofer 16 cm cone × 1
Mid range 7 cm cone × 1
Tweeter 2 cm piezo × 1
Power handling capacity Subwoofer 360 (180 + 180) W
Main speaker 160 (80 + 80) W
Impedance Subwoofer 6 Ω
Main speaker 4 Ω
Frequency range Subwoofer 30 Hz - 1 000 Hz
Main speaker 50 Hz - 20 000 Hz
Sound pressure level Subwoofer 74 dB/W·m
Main speaker 84 dB/W·m
Dimensions (approx.) 295 mm × 452 mm × 390 mm (W/H/D)
Mass (approx.) 8.9 kg each
Design and specifications are subject to change without notice.
1-2 (No.MB455)
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.MB455)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.MB455)
SECTION 3
A
A
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 five
screws A attaching the metal cover. (See Fig.1.)
(2) From the both sides of the main body, remove the four
screws A 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
Metal cover
A
A
A
A
Fig.3
A
Fig.1
Metal cover
A
Fig.2
(No.MB455)1-5
3.1.2 Removing the tuner
(See Figs.4 and 5)
• 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.4.)
(2) From the back side of the main body, remove the two
screws B attaching the tuner to the rear panel. (See Fig.5.)
Tuner
Connector
Fig.4
Rear panel
Tuner
B
Fig.5
1-6 (No.MB455)
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