JVC RX-7042-S 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

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 A attaching the top cover.

(2) From the back side of the main body, remove the three

screws B attaching 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 direc­tion of the arrow 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

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 C attaching the front panel as-

sembly. (See Fig.2)

(5) From the bottom side of the main body, remove the four

screws D attaching the front panel assembly. (See Fig.3)

(6) Remove the front panel assembly in the direction of the ar-

row. (See Fig.3)

on the

Top cover

A

Tie band

Wire
protection
board

Card wire

CN400

2

1

Fig.1

Front panel assembly

C

C

CN402

B
A

1

C

Card wire

Power
supply
board

Micon
board

Fig.2

Front panel assembly

DD

Fig.3

1-6 (No.MB172)

3.3 Removing the rear panel

r

(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 F and three

screws G attaching the rear panel.

E

G

E

F

E

Strain relief

Rear panel

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

ter board.
(4) Disconnect the wire from the connector CN714

board(L).
(5) Disconnect the wire from the connector CN717 on the sur-

round back board.
(6) Disconnect the wire from the connector CN719

board(R).
(7) Disconnect the wire from the connector CN723

board.
(8) Disconnect the connectors (CN205, CN381, CN501) on

the I/O board in an upward direction.

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

audio board from the top side of the main body, take out the
tuner.

(2) Disconnect the DSP board from the connector CN601

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.

on the cen-

on the front

on the front

on the main

on the

on

Front board(R)

,

CN719

Main

board

CN723

Plastic

rivet

CN501

Stopper

board

CN381

CN205

Stopper board

CN314

CN303

CN101

DSP board

CN717

Card wire

GE

Fig.4

Surround board

Front board(L)

Plastic rivet

Fig.5

CN201 CN241

CN714

I/O board

E G

Center board

Tie
band

CN722

Tie
bands

Tune

CN601

Audio board

Video board

Fig.6

Micon board

S-video board

(No.MB172)1-7

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

(2) Disconnect the relay board from the connectors CN81

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 H attaching the micon board.
(6) Remove the three screws J attaching the transistors

, Q941, Q981) to the chassis base.

(Q931

(7) Loosen the screw K attaching the micon board.

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

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.

on the micon board.

on

, CN814)

J

CN831

Card wire

Main board

Relay
board

H

CN400

K

H

Chassis

Micon board

Transistors
(Q931,Q941,Q981)

Micon board

,

Main board

CN931

CN932

H

Fig.7

Tie band

base

CN81

CN931

CN932

1-8 (No.MB172)

CN814

CN813

Speaker board

Fig.8

3.8 Removing the main board

r

(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

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

) on the main board.

CN881

(6) Disconnect the wires from the connectors (CN723, CN813,

) on the main board.

CN814

(7) Disconnect the wire from the connector CN722

ter board.

(8) Disconnect the wire from the connector CN714

board(L).

(9) Disconnect the wire from the connector CN717

round back board.

(10) Disconnect the wire from the connector CN719

board(R).

(11) Remove the screw K, four screws L, two screws M and two

screws N attaching the main board.

(12) Take out the main board.

on the pow-

on the cen-

on the front

on the sur-

on the front

Front board(R)

Surround board

Tie band

CN881

CN717

M

,

,

Wire
protection
board

L

Card wire

N

Main
board

CN723

CN814

CN719

Micon board

CN831

CN813

Front board(L)

Center board
Tie
band

M

N

CN714

Fig.9

L

CN71

CN722

CN811

Power
supply
board

Power
transforme
board 1

Tie bands

Relay
board

K

CN81

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 P attaching the main board to the heat sink. (See
Fig.10)

(2) Disconnect the connectors (CN701

board, remove the main board. (See Fig.10)

(3) Remove the twelve screws Q attaching the heat sink. (See

Fig.11)

-CN706) on the main

P

CN703

Heat sink

Heat sink

CN701

CN704

Fig.10

CN702

Main board

P

CN706

CN705

Q

Q

Fig.11

(No.MB172)1-9

3.10 Removing the center board, surround back board, front boards (L/R) and surround boards (L/R)

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 P attaching the main board to the heat sink. (See
Fig.10)

(2) Disconnect the connectors (CN701

board, remove the main board. (See Fig.10)

(3) Remove the two screws Q attaching the center board. (See

Fig.12)

(4) Remove the two screws Q attaching the front board(L).

(See Fig.12)

(5) Remove the two screws Q attaching the surround back

board. (See Fig.12)

(6) Remove the two screws Q attaching the front board(R).

(See Fig.12)

(7) Remove the two screws Q attaching the surround board(L).

(See Fig.12)

(8) Remove the two screws Q attaching the surround

board(R). (See 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

on the power transformer board 1.

(3) Remove the solders from the soldered sections a on the

power transformer board 2.

(4) Remove the four screws R attaching the power transform-

er.

to CN706) on the main

, CN811)

Surround board(R)

Tie band

Front board(R)

Front board(L)

Q Q Q Q Q Q

Surround back board

Surround board(L)

Fig.12

CN811 CN55

Center board

Power
transformer
board 1

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 S and screw T attaching the power/fuse board.

(2) Remove the solders from the soldered sections b attaching

the power cord.

(3) From the reverse side of the power/fuse board, remove the

solders from the soldered sections c attaching the wires.

Soldered
sections a

Soldered sections c

Power/fuse board

Power
transformer

RR

Power
transforme
board 2

T

Soldered
sections b

Power cord

S

Fig.13

1-10 (No.MB172)

3.13 Removing the power supply board

r

(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
board 1.

(2) Disconnect the card wire from the connector CN402

power supply board.

(3) Disconnect the relay board from the connector CN71

the power supply board.

(4) Remove the three screws U attaching the power supply

board.

(5) Remove the power supply board from the hook d of 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 e attaching 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

the main board. (See Fig.14)

(3) From the front side of the main body, remove the nut and

screw V attaching the headphone bracket to the front
bracket. (See Fig.15)

(4) Remove the three screws U attaching 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.

on the power transformer

on the

on

on

U

CN71

Tie
bands

CN881

Main board

Relay board

Nut

CN402

Card wire

Power supply board

Headphone
jack board

U

Soldered
sections e

U

CN55

Power
transforme
board 1

Hook d of the chassis base bracket

Fig.14

V

Headphone jack board

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 W attaching the switch board.

(2) Take out the switch board, disconnect the wire from the

connector CN432

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 X attaching the power switch board.

(2) Take out the power switch board, disconnect the wire from

the connector CN430

on the switch board.

on the power switch board.

Headphone bracket

W

CN432

Switch board

W

Front bracket

Fig.15

Front panel assembly

CN430

X

Power switch board

Fig.16

(No.MB172)1-11

3.17 Removing the front key & system control board

Y

(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 Y attaching the sub panel assembly. (See
Fig.18)

(3) Remove the sub panel assembly while releasing the claws

f in the direction of the arrow. (See Figs.18 and 19)

(4) Release the claws g attaching 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)

Front panel assembly

Volume knob

Nut

Jog knob

Fig.17

Y

Claws f Claws f

Sub panel assembly

Front key & System control board

Sub panel assembly

Fig.18

Fig.19

Front panel assembly

Front panel assembly

Front panel assembly

1-12 (No.MB172)

Claws g

Fig.20

SECTION 4

ADJUSTMENT

4.1 Adjustment method

 Tuner section

1. Tuner range

FM 87.5MHz to 108.0MHz

AM 530kHz to 1710kHz

 Power amplifier section

Adjustment of idling current

Measurement location B2204

Adjustment part VR787

Attention:

This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an in­ternal 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
(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.

-82205 (Lch), B2213-B2214 (Rch)

(Lch), VR788 (Rch)

and B2205 (Lch) and, connect it between B2213 and B2214 (Rch).

• 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.

VR787 (Lch)

Front amp. board (L)

VR787

B2204

B2205

B2204, B2205 (Lch)

VR788 (Rch)

Front amp. board (R)

VR788

B2213

B2214

,

B2213, B2214 (Rch)

(No.MB172)1-13

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 be­tween 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

Pin 3

Pin 4

Pin 5

Pin 7

Analog value : 0 - 2.2
Digital value : 000 - 1C0

Analog value : 0 - 2.2
Digital value : 000 - 1C0

Analog value : 0 - 2.2
Digital value : 000 - 1C0

Analog value : 0 - 2.2
Digital value : 000 - 1C0

Analog value : 0 - 2.2
Digital value : 000 - 1C0

Analog value : 2.2 - 2.8
Digital value : 1C1 - 240

Analog value : 2.2 - 2.8
Digital value : 1C1 - 240

Analog value : 2.2 - 2.8
Digital value : 1C1 - 240

Analog value : 2.2 - 2.8
Digital value : 1C1 - 240

Analog value : 2.2 - 2.8
Digital value : 1C1 - 240

Analog value : 2.8 - 5.0
Digital value : 241 - 3FF

Analog value : 2.8 - 5.0
Digital value : 241 - 3FF

Analog value : 2.8 - 5.0
Digital value : 241 - 3FF

Analog value : 2.8 - 5.0
Digital value : 241 - 3FF

Analog value : 2.8 - 5.0
Digital value : 241 - 3FF

1-14 (No.MB172)

(No.MB172)1-15

VICTOR COMPANY OF JAPAN, LIMITED

AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB172)

Printed in Japan

WPC

SCHEMATIC DIAGRAMS

AUDIO/VIDEO CONTROL RECEIVER

RX-7042S

CD-ROM No.SML200403

Area suffix

J ----------------------------- U.S.A.
C -------------------------- Canada

Contents

Block diagram
Standard schematic diagrams
Printed circuit boards

COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LTD.

2-1

2-3
2-23 to 33

No.MB172SCH

2004/3

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 >

Block diagram

TO

TUNER

J371

DVD. F-L /R

TV/DBS.L/R

J372

VCR.REC-L/R

VCR.PLAY-L/R

J373

TAPE/CDR.

REC-L/R

TAPE/CDR.

PLAY-L/R

CD-L/R

DVD. C

DVD. SW

DVD. LS

DVD. RS

J1491
SUB

WOOFER

DVD.Y/Pb/Pr

STB.Y/Pb/Pr

MONITOR.

Y/Pb/Pr

J1350

COMPULINK

DVD -C/ Y

TV/DBS-C/Y

VCR1R-C/R-Y

VCR1P-C/P-Y

MONITOR-C/Y

Audio signal input section

CN314

TUL
TUR

TUCE, TUCK, TUDI, TUDO

MAIN_STB
MAIN_CLK
MAIN_DATA

IC371

Source

Selector

SIG.L
SIGR

IC303

AMP.

FRONT-L

FRONT-R
V. SI G . L
V. SI G R

CN371

CN381

Volume / Video
component section

J1360

IC304, IC386

AMP.

Q1441, Q1445, Q1447

SW MUTE

J1380

IC389
IC390

VIDEO3
VIDEO4

SW

DCS

Video signal input section
(S-Video)

J241

IC241
IC242

C

J242

J244

SW

IC243
IC244

Y

SW

CN313

CN315

SW_MUTE
FR_RELAY
C_RELAY
SUR_RELAY
SBK_RELAY

MAIN_STB, MAIN_CLK
MAIN_DATA, FRONT-L/R

SW_MUTE

VIDEO1
VIDEO2
VIDEO3

CN240

VIDEO1
VIDEO2
VIDEO3

System control section

MAIN_STB, MAIN_CLK
MAIN_DATA, TUCE

CN303

TUDI, TUDO, TUCK
SW_MUTE

FR_RELAY, C_RELAY
SUR_RELAY, SBK_RELAY

CN101

Q931

MICOM5V REG.

DSP5V REG.

Q941

VIDEO12V REG.

Q981

A+12V REG.

IC380
Audio

Source

Selector

Video signal input section

J201

DVD

TV/DBS

J202

VCR1REC

VCR1PB

J204

MONITOR

DSPCLK, DSPREADY, DSPRESET
DSPSTATUS, DSP_COMMAND

HP_RELAY

IC901
System
MICON

SUR_RELAY, C_RELAY, SUB_RELAY
F1_RELAY, F2_RELAY, SBK_RELAY

VIDEO1, VIDEO2, VIDEO3, VIDEO4
VOL_STB, VOL_CLK, VOL_DATA

M_RESET, M_BUSY, M_STATUS
M_COMMAND, M_CS, M_CLK

DSPA5V, RDS5V, MICON5V

DSP5V, A+12V, A-12V

TU+9V, VIDEO12V, +B2

DSP_IN_L, DSP_IN_R
DSP.L, DSP.R, DSP.SL
DSP.SR, DSP.C, DSP.SW

DSP.SrBK

IC381

to

IC383

Volume IC

VOL_CLK, VOL_STB
VOL_ DATA

IC201
IC202

V

SW

Q921

DSPA5V REG.

RDS5V REG.

Q961

A-12V REG.

Q971

TU+9V REG.

IC399

AMP.

VIDEO1
VIDEO2
VIDEO3

CN205

CN204

VOL_CLK
VOL_ DATA
VOL_STB
DCS
VIDEO3
VIDEO4

DCS

POWER_ON

SIG.L

SIG.R

SIG.SL
SIG.SR

SIG.C

SIG.SrBKL

CN601

FW831

CN931

CN932

CN201

CN204

CN81CN400

CN501

CN734CN732CN731

CN735CN733

CN200

2-1

Standby LED

S480 to S483

S433, S434

CN430

CN432

FL display section

KEY1

Q413

STANDBY_LED

KEY1 to 6

Q410, Q411

Dimmer

S400 to S432

CN422CN420

KEY6

Dimmer

DIRECT_LED
CC_CON_LED

IC400
Display
Control

Driver

M_CLK,M_COMMAND, M_STATUS
M_CS, M_BUSY,M_RESET

DCSO, DCSI

JOG1
JOG2

Q402,Q403

JS400

Volume JOG

RM

IC404

FL1, FL2

Remocon

S1 to S36
G1 to G17

DI400

FL Display

-VPP

CN410

DCS

CN412

DSP IC / Digital signal input terminal section

CN681

DSPRESET, DSPREADY, DSPCOMMAND
DSP_STATUS, DSP_CLK

DSP.L
DSP.R

IC611 to IC613

AMP.

DSP.SrBK

IC651

AMP.

DSP.C
DSP.SW

IC632 to IC634

AMP.

CN682

DSP.LS
DSP.RS

DSP_IN_L
DSP_IN_R

IC622

AMP.

IC601, IC602

AMP.

A4+/­B3+/-

A4+/-

A3+/­B3+/-

A2+/-, B2+/-

LIN+/-, RIN+/-

Q2101, Q2102, Q2201, Q2202
Q2301, Q3401, Q2501, Q2708

IC682

AD/DA

Converter

IC667

AD/DA

Converter

S.MUTE

PD_DD, RST_DD
96K/48K, 192K/96K

D/A 0
C_BCK
C_LRCLK

D_RST, INT, D_CS, CCLK
CDIN, CDOUT

C_BCK, C_LRCLK, S_BCK
S_LRCLK, DATA, D/A0 to 3

S.MUTE

IC673

Compression

IC671

Digital Signal

MICK

Controller

SCK

IC673

CC_RST
CC_CS
CC_CLK
CCDATA

DSP_RST
HREQ
SS, SCK,
MOSI, MISO
GPIO1 to 4

IC661

DSP

F1_RELAY, F2_RELAY, C_RELAY

FW931

SUR_RELAY, SBK_RELAY

RX0

RX1

RX2

RX3

TX

J681

DiIGITAL IN1

UN682

DIGITAL IN2

UN683

DIGITAL IN3

UN684

DIGITAL IN4

UN686

DIGITAL OUT

Audio amp section

CN714

Q761, Q763

Lch AMP.

Audio amp section

CN719

Q762, Q764

Rch AMP.

Audio amp section

CN722

Q1751, Q1752

Cch AMP.

Audio amp section

CN717

Q1951, Q1952

SBch AMP.

Audio amp
section

Q1851, Q1853

SLch AMP.

Audio amp
section

Q1852, Q1854

SRch AMP.

CN82

CN72

CN715

CN716

CN71

Speaker
section

CN711

CN701 CN702 CN703 CN704 CN706CN705CN723

CN712

CN713

CN718

Primary
section
(Power
transformer 1)

terminal

CN55

FW51

HP_RELAY

+B, -B

D801

to

D804

CN801

CN811

CN831

RY871

Power
Trans.

Primary section

POWER_ON

RY831

CN823

RY832

CN824

CN814CN813

RY852

Speaker

terminal section

(Speaker)

Speaker

terminal section

(Headphone jack)

FW881

CN881

HP_L, HP_R

Primary section
(Power transformer 2)

Q53

RY851

RY853

ST832

L(SPK2)

R(SPK2)

ST833

L(SPK1)

R(SPK1)

CENTER

ST853

SURR-BACK

SURR-L

SURR-R

J91

Headphone
jack

CN402

VPP

Q71

-VPP REG.

+B2, -B2

D61 to D64

FL1
FL2

B+5V

Q52

B+5V REG.

D51 to D54

T2

Powe r
Tr an s .

RY1

Main

plug

Primary
section
(Power/fuse)

2-2

Standard schematic diagrams

2

Primary section

(SHEET 8)

CN402
QGF1205C1-06

CN82
QGB2510K1-08

(SHEET 9)

CN72

QGB2510K1-09

CN71
QGB2510J1-09

C69

0.047MY

C68

0.047MY

100k

R74

(SHEET 2)

C74

1/50

D75

MTZ8.2JC

CN811
QGA3901F2-03

FW51

QUM215-10DGZ4

Q74

KTC3200/GL/

CN55
QGD2501C1-05Z

D63

10DDA20-FD

3300/35

Q71

KTA1046/Y/

C73

22/50

R73 D74 C72

MTZ36JC

22k

10DDA20-FD

!

D61

!

C65

11ES2-T4

3.3k

R72

22/50

!

131

132

113

112

111

C62C61

0.1MY0.1MY

D64

11ES2-T4

!

TH71

QAD0095-4R7Z

123

122

121

134

133

D51

!

!

D53

11ES2-T4

0.0047/100

11ES2-T4

C51

!

!

D54

C52

1000/

F61

!

F62

!

R61

3.3

11ES2-T4

D62

!

C63

0.1MY

!

C66

1000/35

D73

C70

220/50

D71

11ES2-T4

C71

D72

100/63

11ES2-T4

2-3