JVC RX-7042S Service Manual
SERVICE MANUAL
AUDIO/VIDEO CONTROL RECEIVER
MB17220043
RX-7042S
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MB172
2004/3
SPECIFICATION
Amplifier
Output Power
At Stereo
Operation
At Surround
Operation
Audio
Audio Input Sensitivity/
Impedance (1 kHz)
Audio Input
(DIGITAL IN)*
* Corresponding to Linear PCM, Dolby Digital, and DTS (with sampling frequency-32 kHz, 44.1 kHz, 48 kHz).
Audio Output Level SUBWOOFER OUT : 1 V
Recording Output Level VCR OUT, TAPE/CDR OUT : 200 mV
Digital Output Optical DIGITAL OUT Signal wave length : 660 nm
Signal-to-Noise Ratio
('66 IHF/'78 IHF)
Frequency Response (8
Bass Boost +6 dB ±1.0 dB at 100 Hz
Equalization 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz (±8 dB) (in 2 dB steps)
Video
Video Input Sensitivity/Impedance Composite Video : DVD IN, VCR IN, TV SOUND/DBS IN 1 V(p-p)/75
Video Output Level Composite Video : VCR OUT, MONITOR OUT 1 V(p-p)/75 Ω
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
50 dB Quieting Sensitivity Monaural : 16.0 dBf (1.7
Stereo Separation at OUT (REC) 35 dB at 1 kHz
Tuning Range 530 kHz to 1 710 kHz
Power Requirements AC 120V , 60 Hz
Power Consumption 320 W/440 VA (at operation), 2 W (in standby mode)
Dimensions (W
Mass 12.1 kg (26.7 lbs)
Front ch 130 W per channel, min. RMS, driven into 8
Front ch 130 W per channel, min. RMS, driven into 8
Center ch 130 W, min. RMS, driven into 8
Surround ch 130 W per channel, min. RMS, driven into 8
Surround Back ch 130 W, min. RMS, driven into 8
Coaxial DIGITAL 1 (DVD) : 0.5 V(p-p)/75 Ω
Optical DIGITAL 2 (CD), DIGITAL 3 (TV), DIGITAL 4 (CDR) : -21 dBm to -15 dBm (660 nm ±30 nm)
distortion.
Ω at 1 kHz, with no more than 0.8% total harmonic distortion.
Ω at 1 kHz, with no more than 0.8% total harmonic distortion.
DVD IN, VCR IN, TV SOUND/DBS IN : 200 mV/47 k
CD IN, TAPE/CDR IN : 200 mV/47 kΩ
Output level : -21 dBm to -15 dBm
DVD IN, VCR IN, TV SOUND/DBS IN : 87 dB/80 dB
CD IN, TAPE/CDR IN : 87 dB/80 dB
Ω) DVD IN, VCR IN, TV SOUND/DBS IN : 20 Hz to 100 kHz (+1 dB, -3 dB)
CD IN, TAPE/CDR IN : 20 Hz to 100 kHz (+1 dB, -3 dB)
S-video : DVD IN, VCR IN, TV SOUND/DBS IN (Y: luminance) : 1 V(p-p)/75 Ω
Component Video DVD IN, DBS (VCR) IN : DVD IN, DBS (VCR) IN (Y: luminance) : 1 V(p-p)/75 Ω
S-video : VCR OUT, MONITOR OUT (Y: luminance) : 1 V(p-p)/75 Ω
Component Video : MONITOR OUT (Y: luminance) : 1 V(p-p)/75 Ω
FM tuner (IHF)
µV/75 Ω)
µV/75 Ω)
Stereo : 37.5 dBf (20.5
µV/75 Ω)
AM tuner
General
× H × D) 435 mm × 157 mm × 425 mm (17 3/16 in. × 6 3/16 in. × 16 3/4 in.)
Designs & specifications are subject to change without notice.
Ω, 20 Hz to 20 kHz, with no more than 0.08% total harmonic
Ω at 1 kHz, with no more than 0.8% total harmonic distortion.
Ω at 1 kHz, with no more than 0.8% total harmonic distortion.
Ω
(C: chrominance, burst) : 0.286 V(p-p)/75 Ω
(PB/PR) : 0.7 V(p-p)/75 Ω
(C: chrominance, burst) : 0.286 V(p-p)/75 Ω
(PB/PR) : 0.7 V(p-p)/75 Ω
Ω
1-2 (No.MB172)
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.MB172)1-3
1.5 Importance administering point on the safety
Power / fuse board
F1
6.3A-125V
Power trans 1 board
2A-125V
F61
2A-125V
F62
Caution: For continued protection against risk of
fire, replace only with same type 6.3A/125V for
F1, 2A/125V for F61 and F62.
This symbol specifies type of fast operating fuse.
1-4 (No.MB172)
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F1 comme le meme type
que 6.3A/125V, et 2A/125V pour F61 et F62.
Ce sont des fusibles suretes qui functionnes rapide.
^
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB172)1-5
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