JVC RX-7042S User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB172
2004/3
AUDIO/VIDEO CONTROL RECEIVER
MB17220043
RX-7042S
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
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada

1-2 (No.MB172)
SPECIFICATION
Designs & specifications are subject to change without notice.
Amplifier
Output Power
At Stereo
Operation
Front ch 130 W per channel, min. RMS, driven into 8 Ω, 20 Hz to 20 kHz, with no more than 0.08% total harmonic
distortion.
At Surround
Operation
Front ch 130 W per channel, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic distortion.
Center ch 130 W, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic distortion.
Surround ch 130 W per channel, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic distortion.
Surround Back ch 130 W, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic distortion.
Audio
Audio Input Sensitivity/
Impedance (1 kHz)
DVD IN, VCR IN, TV SOUND/DBS IN : 200 mV/47 kΩ
CD IN, TAPE/CDR IN : 200 mV/47 kΩ
Audio Input
(DIGITAL IN)*
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)
* 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
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 (8 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)
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 Ω
S-video : DVD IN, VCR IN, TV SOUND/DBS IN (Y: luminance) : 1 V(p-p)/75 Ω
(C: chrominance, burst) : 0.286 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
(PB/PR) : 0.7 V(p-p)/75 Ω
Video Output Level Composite Video : VCR OUT, MONITOR OUT 1 V(p-p)/75 Ω
S-video : VCR OUT, MONITOR OUT (Y: luminance) : 1 V(p-p)/75 Ω
(C: chrominance, burst) : 0.286 V(p-p)/75 Ω
Component Video : MONITOR OUT (Y: luminance) : 1 V(p-p)/75 Ω
(PB/PR) : 0.7 V(p-p)/75 Ω
Synchronization Negative
Signal-to-Noise Ratio 45 dB
FM tuner (IHF)
Tuning Range 87.5 MHz to 108.0 MHz
Usable Sensitivity Monaural : 12.8 dBf (1.2 µV/75 Ω)
50 dB Quieting Sensitivity Monaural : 16.0 dBf (1.7 µV/75 Ω)
Stereo : 37.5 dBf (20.5 µV/75 Ω)
Stereo Separation at OUT (REC) 35 dB at 1 kHz
AM tuner
Tuning Range 530 kHz to 1 710 kHz
General
Power Requirements AC 120V , 60 Hz
Power Consumption 320 W/440 VA (at operation), 2 W (in standby mode)
Dimensions (W ×H ×D) 435 mm ×157 mm ×425 mm (17 3/16 in. ×6 3/16 in. ×16 3/4 in.)
Mass 12.1 kg (26.7 lbs)

(No.MB172)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.MB172)
1.5 Importance administering point on the safety
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.
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.
^
Power trans 1 board
Power / fuse board
6.3A-125V
F1
2A-125V
F61
2A-125V
F62

(No.MB172)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MB172)
SECTION 3
DISASSEMBLY
3.1 Removing the top cover
(See Fig.1)
(1) From the right and left sides of the main body, remove the
four screws Aattaching the top cover.
(2) From the back side of the main body, remove the three
screws Battaching the top cover.
(3) Remove the top cover in the direction of the arrow 2 while
extending the lower sections of the top cover in the direc-
tion of the arrow 1.
Fig.1
3.2 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 fixing the
card wire. (See Fig.2)
(4) Remove the three screws Cattaching the front panel as-
sembly. (See Fig.2)
(5) From the bottom side of the main body, remove the four
screws Dattaching the front panel assembly. (See Fig.3)
(6) Remove the front panel assembly in the direction of the ar-
row. (See Fig.3)
Fig.2
Fig.3
Top cover
A
2
1
1
B
A
CCC
Front panel assembly
Card wire
CN402
Tie band
Wire
protection
board
CN400
Micon
board
Power
supply
board
Card wire
DD
Front panel assembly

(No.MB172)1-7
3.3 Removing the rear panel
(See Fig.4)
• Prior to performing the following procedures, remove the 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 Fand three
screws Gattaching the rear panel.
Fig.4
3.4 Removing the I/O board
(See Fig.5)
• Prior to performing the following procedures, remove the top
cover and rear panel.
(1) Remove the two plastic rivets in the direction of the arrow
from the top side of the main body, remove the stopper
boards in the direction of the arrow.
(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, CN501) on
the I/O board in an upward direction.
Fig.5
3.5 Removing the tuner, DSP board, audio board, video board and S-video board
(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) 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 board from the connector CN201 on
the micon board.
(5) Disconnect the S-video board from the connector CN241
on the micon board.
Fig.6
Strain relief
E
G
EF
GE
E
E G
Rear panel
CN381
CN205
CN501
Plastic rivet
Plastic
rivet
Stopper
board
Stopper board
Tie
band
Center board
Tie
bands
Front board(L)
Surround board
Front board(R)
CN719
CN717 CN714
CN722
CN723
Main
board
I/O board
CN314
Tune
r
Audio board
Card wire
CN601
DSP board
CN303
CN101
Video board
S-video board
CN201 CN241
Micon board

1-8 (No.MB172)
3.6 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 connectors CN81 on
the micon board.
(3) Disconnect the parallel wire from the connectors CN931
and CN932 on the micon board.
(4) Disconnect the parallel wire from the connector CN831 on
the main board.
(5) Remove the three screws Hattaching the micon board.
(6) Remove the three screws Jattaching the transistors
(Q931, Q941, Q981) to the chassis base.
(7) Loosen the screw Kattaching the micon board.
Fig.7
3.7 Removing the speaker board
(See Fig.8)
• Prior to performing the following procedures, remove the top
cover and rear panel.
(1) From the top side of the main 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.
Fig.8
CN400
Micon board
Relay
board
CN81
Card wire
CN931
CN932
H
H
H
J
Transistors
(Q931,Q941,Q981)
Chassis
base
K
CN831 Main board
Tie band
CN813
Main board
Speaker board
CN814
CN931
CN932
Micon board

(No.MB172)1-9
3.8 Removing the main board
(See Fig.9)
• Prior to performing the following procedures, remove the 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 bundling
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, four screws L, two screws Mand two
screws Nattaching the main board.
(12) Take out the main board.
Fig.9
3.9 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 Pattaching the main board to the heat sink. (See
Fig.10)
(2) Disconnect the connectors (CN701-CN706) on the main
board, remove the main board. (See Fig.10)
(3) Remove the twelve screws Qattaching the heat sink. (See
Fig.11)
Fig.10
Fig.11
Tie band
Wire
protection
board
Micon board
Card wire Tie bands
CN811
Power
transforme
r
board 1
CN71
CN81
Relay
board
Power
supply
board
CN831
CN881
Main
board
CN723
CN814
CN813
Center board
CN722
Front board(L)
CN714
Surround board
CN717
Front board(R)
CN719
K
N
N
L
M
L
Tie
band
M
Heat sink
PP
Main board
CN703 CN701
CN704 CN702 CN705
CN706
Heat sink
Q
Q

1-10 (No.MB172)
3.10 Removing the center board, surround back board, front boards (L/R) and surround 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 Pattaching the main board to the heat sink. (See
Fig.10)
(2) Disconnect the connectors (CN701 to CN706) on the main
board, remove the main board. (See Fig.10)
(3) Remove the two screws Qattaching the center board. (See
Fig.12)
(4) Remove the two screws Qattaching the front board(L).
(See Fig.12)
(5) Remove the two screws Qattaching the surround back
board. (See Fig.12)
(6) Remove the two screws Qattaching the front board(R).
(See Fig.12)
(7) Remove the two screws Qattaching the surround board(L).
(See Fig.12)
(8) Remove the two screws Qattaching the surround
board(R). (See Fig.12)
Fig.12
3.11 Removing the power transformer
(See Fig.13)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main 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 aon the
power transformer board 2.
(4) Remove the four screws Rattaching the power transform-
er.
3.12 Removing the power/fuse board
(See Fig.13)
• Prior to performing the following procedures, remove the top
cover.
(1) From the back and top sides of the main body, remove the
screw Sand screw Tattaching the power/fuse board.
(2) Remove the solders from the soldered sections battaching
the power cord.
(3) From the reverse side of the power/fuse board, remove the
solders from the soldered sections cattaching the wires.
Fig.13
Surround board(R)
Q Q Q Q Q Q
Surround board(L)
Front board(R)
Surround back board
Front board(L)
Center board
Tie band
CN811 CN55
Power
transformer
board 1
Power
transforme
r
board 2
Soldered
sections a
RR
Power
transformer
S
T
Power/fuse board
Soldered
sections b
Power cord
Soldered sections c

(No.MB172)1-11
3.13 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 connector CN71 on
the power supply board.
(4) Remove the three screws Uattaching the power supply
board.
(5) Remove the power supply board from the hook dof 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 eattaching the wires.
3.14 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 connector CN881 on
the main board. (See Fig.14)
(3) From the front side of the main body, remove the nut and
screw Vattaching the headphone bracket to the front
bracket. (See Fig.15)
(4) Remove the three screws Uattaching the power supply
board. (See Fig.14)
(5) Take out the headphone jack board from the inside of the
chassis base while lifting the power supply board.
Fig.14
Fig.15
3.15 Removing the switch board
(See Fig.16)
• Prior to performing the following procedures, remove the top
cover and front panel assembly.
(1) From the back side of the front panel assembly, remove the
two screws Wattaching the switch board.
(2) Take out the switch board, disconnect the wire from the
connector CN432 on the switch board.
3.16 Removing the power switch board
(See Fig.16)
• Prior to performing the following procedures, remove the top
cover and front panel assembly.
(1) From the back side of the front panel assembly, remove the
two screws Xattaching the power switch board.
(2) Take out the power switch board, disconnect the wire from
the connector CN430 on the power switch board.
Fig.16
CN55
Power
transforme
r
board 1
Hook dof the chassis base bracket
U
Relay board
CN402 Card wire
Power supply board
CN71
U
U
Soldered
sections e
Tie
bands
Headphone
jack board
Main board
CN881
Nut
Headphone jack board
Headphone bracket
Front bracket
V
CN432
W
W
Switch board
Front panel assembly CN430
Power switch board
X

1-12 (No.MB172)
3.17 Removing the front key & system control board
(See Figs.17 to 20)
• Prior to performing the following procedures, remove the 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 Yattaching the sub panel assembly. (See
Fig.18)
(3) Remove the sub panel assembly while releasing the claws
fin the direction of the arrow. (See Figs.18 and 19)
(4) Release the claws gattaching 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)
Fig.17
Fig.18
Fig.19
Fig.20
Volume knob
Nut
Front panel assembly
Jog knob
Y
Y
Claws fClaws f
Front panel assembly
Sub panel assembly
Sub panel assembly Front panel assembly
Front key & System control board
Front panel assembly
Claws g

(No.MB172)1-13
SECTION 4
ADJUSTMENT
4.1 Adjustment method
Tuner section
1. Tuner range
Power amplifier section
Adjustment of idling current
Attention:
This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an in-
ternal temperature has risen). Please adjust immediately after using the amplifier after turning off the power supply of
the amplifier and falling an internal temperature.
<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 not become 0mA even if it is finished to turn variable resistance (VR787,
VR788) in the direction of counterclockwise.
FM 87.5MHz to 108.0MHz
AM 530kHz to 1710kHz
Measurement location B2204-82205 (Lch), B2213-B2214 (Rch)
Adjustment part VR787 (Lch), VR788 (Rch)
Front amp. board (L)
VR788
Front amp. board (R)
VR787
B2204 B2205
B2213 B2214
VR787 (Lch)
B2204, B2205 (Lch)
VR788 (Rch)
B2213, B2214 (Rch)

1-14 (No.MB172)
SECTION 5
TROUBLESHOOTING
5.1 Self-diagnose function
This model incorporates the following self-diagnostic functions.
1. PROTECTOR
• The PROTECTOR IN port detects errors such as speaker overcurrent and DC voltage output errors (Active: L). Immediately after
detection, all relays are switched off and the alarm display as shown below (blinking at intervals of 0.5 sec. ON and 0.5 sec. OFF)
is displayed in the lower part of the FL matrix.
During the alarm display, all other FL and LED segments are turned off.
OVERLOAD
• The overload status can be canceled by switching the power off. When the power is switched on again, the unit is turned on in
the same abnormal status as before. Lower the volume level for 10 steps for protection. (If the previous volume level was be-
tween 0 and 9, lower it to 0).
• The detection by the protector is not performed for 4 seconds after power on.
2. Supply voltage error detection
• When the power is switched on, the supply voltage at the A/D input port (pins 2 to 5 and 7) is monitored and, when an error is
detected continuously for 1 second, the unit immediately enters the standby mode.
• When the power is switched on again, the unit is turned on in the same abnormal status as before.
• The supply voltage error detection is not performed for 4 seconds after power on.
• The following table shows the error detection thresholds.
At abnormal state (Low voltage) At normal state At abnormal state (High voltage)
Pin 2 Analog value : 0 - 2.2
Digital value : 000 - 1C0
Analog value : 2.2 - 2.8
Digital value : 1C1 - 240
Analog value : 2.8 - 5.0
Digital value : 241 - 3FF
Pin 3 Analog value : 0 - 2.2
Digital value : 000 - 1C0
Analog value : 2.2 - 2.8
Digital value : 1C1 - 240
Analog value : 2.8 - 5.0
Digital value : 241 - 3FF
Pin 4 Analog value : 0 - 2.2
Digital value : 000 - 1C0
Analog value : 2.2 - 2.8
Digital value : 1C1 - 240
Analog value : 2.8 - 5.0
Digital value : 241 - 3FF
Pin 5 Analog value : 0 - 2.2
Digital value : 000 - 1C0
Analog value : 2.2 - 2.8
Digital value : 1C1 - 240
Analog value : 2.8 - 5.0
Digital value : 241 - 3FF
Pin 7 Analog value : 0 - 2.2
Digital value : 000 - 1C0
Analog value : 2.2 - 2.8
Digital value : 1C1 - 240
Analog value : 2.8 - 5.0
Digital value : 241 - 3FF

(No.MB172)1-15

(No.MB172)
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
VICTOR COMPANY OF JAPAN, LIMITED
WPC
Printed in Japan

SCHEMATIC DIAGRAMS
No.MB172SCH
2004/3
COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LTD.
RX-7042S
Contents
Block diagram
Standard schematic diagrams
Printed circuit boards
2-1
2-3
2-23 to 33
CD-ROM No.SML200403
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada
AUDIO/VIDEO CONTROL RECEIVER

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.
(This regulation does not correspond to J and C version.)

< MEMO >

2-1
IC400
Display
Control
Driver
DI400
FL Display
CN410
M_CLK,M_COMMAND, M_STATUS
M_CS, M_BUSY,M_RESET
CN412
Q402,Q403
KEY1
KEY6
CN422CN420
DCS
FL1, FL2
-VPP
IC404
Remocon
JS400
Volume JOG
S400 to S432
Q410, Q411
Dimmer
DIRECT_LED
CC_CON_LED
Q413
Dimmer
STANDBY_LED
KEY1 to 6
DCSO, DCSI
S1 to S36
G1 to G17
RM
JOG1
JOG2
FL display section
CN430
S480 to S483
Standby LED
CN432
S433, S434
CN371
IC371
Source
Selector
TAPE/CDR.
REC-L/R
TAPE/CDR.
PLAY-L/R
CD-L/R
J373
SIG.L
SIGR
VCR.REC-L/R
VCR.PLAY-L/R
J372
TO
TUNER
CN314
TUL
TUR
TUCE, TUCK, TUDI, TUDO
CN313
MAIN_STB
MAIN_CLK
MAIN_DATA
IC303
AMP.
FRONT-L
FRONT-R
V. S I G . L
V. S I G R
SW_MUTE
FR_RELAY
C_RELAY
SUR_RELAY
SBK_RELAY
CN315
DVD.F-L/R
TV/DBS.L/R
J371
Audio signal input section
IC241
IC242
C
SW
DVD-C/Y
TV/DBS-C/Y
J241
CN240
VCR1R-C/R-Y
VCR1P-C/P-Y
J242
MONITOR-C/Y
J244
IC243
IC244
Y
SW
VIDEO1
VIDEO2
VIDEO3
VIDEO1
VIDEO2
VIDEO3
Video signal input section
(S-Video)
IC201
IC202
V
SW
CN200
VIDEO1
VIDEO2
VIDEO3
DVD
TV/DBS
J201
VCR1REC
VCR1PB
J202
MONITOR
J204
CN204
VOL_CLK
VOL_DATA
VOL_STB
DCS
VIDEO3
VIDEO4
Video signal input section
Q931
MICOM5V REG.
DSP5V REG.
Q981
A+12V REG.
Q941
VIDEO12V REG.
CN81CN400
IC901
System
MICON
FW831 CN201
CN204
CN931 CN932
HP_RELAY
CN601
CN101
Q921
DSPA5V REG.
RDS5V REG.
VIDEO1, VIDEO2, VIDEO3, VIDEO4
VOL_STB, VOL_CLK, VOL_DATA
DSPCLK, DSPREADY, DSPRESET
DSPSTATUS, DSP_COMMAND
CN303
DSPA5V, RDS5V, MICON5V
DSP5V, A+12V, A-12V
TU+9V, VIDEO12V, +B2
Q961
A-12V REG.
Q971
TU+9V REG.
SUR_RELAY, C_RELAY, SUB_RELAY
F1_RELAY, F2_RELAY, SBK_RELAY
M_RESET, M_BUSY, M_STATUS
M_COMMAND, M_CS, M_CLK
DCS
MAIN_STB, MAIN_CLK
MAIN_DATA, TUCE
TUDI, TUDO, TUCK
SW_MUTE
FR_RELAY, C_RELAY
SUR_RELAY, SBK_RELAY
POWER_ON
System control section
CN735CN733
IC381
to
IC383
Volume IC
CN734CN732CN731
SIG.L
SIG.R
SIG.SL
SIG.SR
SIG.C
SIG.SrBKL
CN501
DVD.Y/Pb/Pr
STB.Y/Pb/Pr
MONITOR.
Y/Pb/Pr
J1380
IC389
IC390
SW
IC399
AMP.
CN205
COMPULINK
J1350
SUB
WOOFER
J1491
IC380
Audio
Source
Selector
CN381
Q1441, Q1445, Q1447
SW MUTE
SW_MUTE
VIDEO3
VIDEO4
DCS
DSP_IN_L, DSP_IN_R
DSP.L, DSP.R, DSP.SL
DSP.SR, DSP.C, DSP.SW
DSP.SrBK
MAIN_STB, MAIN_CLK
MAIN_DATA, FRONT-L/R
VOL_CLK, VOL_STB
VOL_DATA
J1360
DVD.C
DVD.SW
DVD.LS
DVD.RS
IC304, IC386
AMP.
Volume / Video
component section
Block diagram