JVC RX-8040-B Service manual

SERVICE MANUAL

AUDIO/VIDEO CONTROL RECEIVER

MB30320047

RX-8040B

Area suffix

UJ ---------------------- U.S.Military

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

COPYRIGHT © 2004 Victor Company of Japan, Limited

No.MB303

2004/7

SPECIFICATION

Amplifier

Output Power At Stereo Operation Front Channel 100 W*1 per channel, min. RMS, driven into 8

harmonic distortion (IEC268-3/DIN).
At Surround Opera­tion

Audio Audio Input Sensitivity/Impedance (1 kHz) DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:200 mV/47 k

Audio Input (DIGI­TAL IN)*2

Audio Output Level ZONE 2 PREOUT:1 V

Recording Output Level TAPE/MD OUT, CDR OUT, VCR 1 OUT, VCR 2 OUT:200 mV
Digital Output (DIGITAL OUT):Optical Signal wave length:660 nm

Signal-to-Noise Ratio ('66 IHF/'78 IHF) DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:87 dB/80 dB

Frequency Response (8

RIAA Phono Equalization ±1.0 dB (20 Hz to 20 kHz)
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, TV SOUND/

Video Output Level Composite Video:VCR 1 OUT, VCR 2

Synchronization Negative
Signal-to-Noise Ratio 45 dB

Tuning Range 87.50 MHz to 108.00 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 531 kHz to 1 602 kHz (at 9 kHz intervals)

Power Requirements AC 110 V/127 V/220 V/230 V - 240 V , adjustable with the voltage selector, 50 Hz/60 Hz
Power Consumption 220 W (at operation) 6.0 W (in standby mode)
Dimensions (W
Mass 12.4 kg

× H × D) 435 mm × 157 mm × 425 mm

Front Channel 100 W*1 per channel, min. RMS, driven into 8

harmonic distortion.

Center Channel 100 W*1, min. RMS, driven into 8

distortion.

Surround Channel 100 W*1 per channel, min. RMS, driven into 8

harmonic distortion.

Surround Back Channel 100 W*1, min. RMS, driven into 8

distortion.

TAPE/MD IN, CDR IN, CD IN:200 mV/47 kΩ

PHONO IN (MM):2.5 mV/47 kΩ

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)

PREOUT:1 V

Output level:-21 dBm to -15 dBm

TAPE/MD IN, CDR IN, CD IN:87 dB/80 dB

PHONO IN (MM):70 dB/78 dB at OUT (REC)

Ω at 1 kHz, with no more than 0.8% total harmonic

Ω at 1 kHz, with no more than 0.8% total harmonic

Ω) DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:20 Hz to 100 kHz (+1 dB, -

3 dB)

TAPE/MD IN, CDR IN, CD IN:20 Hz to 100 kHz (+1 dB, -3 dB)

PHONO IN (MM):20 Hz to 20 kHz (±1 dB)

DBS IN, VCR 1 IN, VCR 2 IN, VIDEO

S-video:DVD IN, TV SOUND/DBS IN, VCR

1 IN, VCR 2 IN, VIDEO

Component Video :DVD IN, DBS (VCR 1)

IN

OUT, MONITOR OUT

S-video:VCR 1 OUT, VCR 2 OUT, MONI-

TOR OUT

Composite 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

530 kHz to 1 600 kHz (at 10 kHz intervals)

µV/75 Ω)

AM tuner

General

*1: Measured on AC 110 V, 127 V, 220 V and 240 V
*2: Corresponding to Linear PCM, Dolby Digital, and DTS (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz).
Designs & specifications are subject to change without notice.

Ω at 1 kHz with no more than 0.8% total

Ω at 1 kHz, with no more than 0.8% total

Ω at 1 kHz, with no more than 0.8% total

Ω

1 V(p-p)/75

(Y: luminance):1 V(p-p)/75 Ω
(C: chrominance, burst):0.286 V(p-p)/75 Ω
(Y: luminance):1 V(p-p)/75 Ω
(PB/PR):0.7 V(p-p)/75 Ω
1 V(p-p)/75 Ω

(Y: luminance):1 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.MB303)

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.MB303)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-4 (No.MB303)

SECTION 3

DISASSEMBLY

3.1 Removing the top cover (See Fig.1)

(1) From the both 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 rear panel (See Fig.2)

• 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 three screws C, thirty-five screws D, two

screws E, two screws F and nut a attaching the rear panel.

Top cover

A

D

D

2

1

Fig.1

E DDF

B
A

1

Nut a

Strain relief

3.3 Removing the RF unit and compu board (See Figs.2 and 3)

• Prior to performing the following procedures, remove the top

cover.
(1) From the top side of the main body, cut off the tie band.

(See Fig.3)

(2) Disconnect the wire from the connector CN1

unit. (See Fig.3)

(3) From the back side of the main body, remove the nut a at-

taching the RF unit. (See Fig.2)

(4) From the top side of the main body, disconnect the wire

from the connector CN262

(5) From the back side of the main body, remove the two

screws F attaching the compu board. (See Fig.2)

on the relay board. (See Fig.3)

on the RF

C

D

Rear panel

Relay board

CN262

C

Fig.2

Tie band

Fig.3

CN1

Compu board

C

RF unit

(No.MB303)1-5

3.4 Removing the I/O board (See Fig.4)

• Prior to performing the following procedures, remove the top

cover and rear panel.
(1) From the top side of the main body, remove the two plastic

rivets in the direction of the arrow 1, and remove the stop­per boards in the direction of the arrow 2.

(2) Cut off 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 I/O board from the connectors (CN205

, CN381 and CN501) in an upward direction.

CN361

Center boardFront board(L)Surround back board

Front
board(R)

CN717 CN714

CN719

Main
board

CN723

CN381

CN501

Plastic
rivet

,

Stopper

2

1

2

1

Tie
band

CN722

Tie
bands

board

CN361

CN205

Stopper board

Plastic rivet

I/O board

Fig.4

1-6 (No.MB303)

3.5 Removing the front panel assembly (See Figs.5 and 6)

• Prior to performing the following procedures, remove the top

cover, rear panel and I/O board.
(1) From the top side of the main body, remove the tie bands

bundling the wires. (See Fig.5)

(2) Disconnect the wire from the connector CN599

board. (See Fig.5)

(3) Disconnect the wire from the connector CN415

audio2 board. (See Fig.5)

(4) Disconnect the wire from the connector CN206

eo board. (See Fig.5)

(5) Disconnect the wire from the connector CN244

Video board. (See Fig.5)

(6) Disconnect the card wire from connector CN402

power supply board. (See Fig.5)

(7) Disconnect the card wire from connector CN400

con board. (See Fig.5)

(8) Remove the tie band and wire protection board fixing the

card wire. (See Fig.5)

(9) Remove the two screws G, screws G' and screw H attach-

ing the front panel assembly. (See Fig.5)

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

screws J attaching the front panel assembly. (See Fig.6)

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

row. (See Fig.6)

Reference:

When attaching the screw G' and screw H, attach the earth
wire with it.

on the DSP

on the

on the vid-

on the S-

on the

on the mi-

Wire
protection
board

Tie
band

Card
wire

Tie
band

CN400

DSP
board

CN599

Front panel assembly Earth wire

Earth wire

G'

CN206CN415

Audio2 board

GGH

Tie
band

CN402

Power
supply
board

Tie
band

Micon
board

CN244

S-Video boardVideo board

Fig.5

Front panel assembly

JJ

Fig.6

(No.MB303)1-7

3.6 Removing the tuner, DSP board, Audio board, Audio2 board, Video board and S-Video board

A

(See Fig.7)

• Prior to performing the following procedures, remove the top
cover, rear panel and I/O board.
(1) From the top side of the main body, cut off the tie band bun-

dling the wire.

(2) Disconnect the card wire from connector CN314

dio board, and take out the tuner.

(3) Disconnect the wire from the connector CN599

board.

(4) Disconnect the DSP board from the connector CN601

the micon board, and take out the DSP board.

(5) Disconnect the audio board from the connectors (CN101

and CN303) on the micon board, and take out the audio
board.

(6) Disconnect the wire from the connector CN415

audio2 board.

(7) Disconnect the audio2 board from the connector CN301

the micon board, and take out the audio2 board.

(8) Disconnect the wire from the connector CN206

eo board.

(9) Disconnect the video board from the connector CN201 on

the micon board, and take out the video board.

(10) Disconnect the wire from the connector CN244

Video board.

(11) Disconnect the S-Video board from the connector CN241

on the micon board, and take out the S-Video board.

on the au-

on the DSP

on

on the

on

on the vid-

on the S-

Card wire

CN314

Tie
band

CN303

CN101

CN415

DSP
board

CN601
CN599

CN301

udio2 board

Audio board

CN206 CN244

Video board

CN201 CN241

S-video board

Fig.7

Tuner

Micon board

3.7 Removing the micon board

(See Fig.8)

• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board, tuner, DSP board, Audio board,
Audio2 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 connector 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 K attaching the micon board.
(6) Remove the three screws L attaching the transistors

(Q921, Q931, and Q941) to the chassis base.
(7) Loosen the screw M attaching the micon board.

on the micon board.

L

Card
wire

K

CN400

K

Micon
board

Transistors
(Q921,Q931,Q941)

CN831

K

CN931 CN932

Fig.8

Main board

Relay
board

M

Chassis base

CN81

1-8 (No.MB303)

3.8 Removing the speaker board

r

(See Fig.9)

• Prior to performing the following procedures, remove the top
cover, 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.

CN814

(3) Disconnect the parallel wire from the connectors (CN931

and CN932) on the micon board.

(4) Take out the speaker board in the direction of the arrow.

and

Micon board

Main board

Tie band

CN931 CN932

3.9 Removing the relay board and main board

(See Fig.10)

• 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 card wire and 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 and

) on the power supply board and micon board.

CN81

(5) Disconnect the wire from the connector CN262 on the relay

board, and take out this board.

(6) Disconnect the wires from the connectors (CN723

CN814, CN831 and CN881) on the main board.

(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 M, six screws N and two screws P at-

taching the main board.

(12) Take out the main board.

on the pow-

, CN813,

on the cen-

on the front

on the sur-

on the front

CN814

Front board(R)

CN813

Surround back board

CN717

N

Tie band
Wire
protection
board

Card wire

Main
board

Tie
band

CN723
CN814

Micon
board

N

P

CN719

CN881

CN831

Fig.9

Front board(L)

Tie band

P

CN714

CN813

Fig.10

Speaker board

Center board

CN71

N

CN81

CN722

CN811

Power
supply
board

Power
transforme
board 1

Tie bands

M

Relay
board

CN262

(No.MB303)1-9

3.10 Removing the heat sink (See Figs.11 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 Q attaching the main board to the heat sink. (See
Fig.11)

(2) Disconnect the connectors (CN701

board, and remove the main board. (See Fig.11)

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

Fig.12)

3.11 Removing the center board, front boards (L/R), sur­round boards (L/R) and surround back board
(See Figs.11 and 13)

• 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 Q attaching the main board to the heat sink. (See
Fig.11)

(2) Disconnect the connectors (CN701

board, and remove the main board. (See Fig.11)

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

Fig.13)

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

(See Fig.13)

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

board. (See Fig.13)

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

(See Fig.13)

(7) Remove the two screws R attaching the surround board

(L). (See Fig.13)

(8) Remove the two screws R attaching the surround board

(R). (See Fig.13)

to CN706) on the main

to CN706) on the main

Heat sink

Main board

Q

CN703 CN701 CN704 CN702 CN705 CN706

Fig.11

Heat sink

Fig.12

Front board(R)

Front board(L)

Q

R

R

R R R R R R

Surround board(R)

Surround board(L)

Surround back board

Center board

Fig.13

1-10 (No.MB303)

3.12 Removing the voltage selector board

r

(See Fig.14 and 15)

• Prior to performing the following procedures, remove the top
cover.
(1) From the back side of the main body, remove the two

screws S attaching the voltage board. (See Fig.14)

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

power transformer board 2 and remove the wires of the
voltage selector board. (See Fig.15)

(3) Take out the voltage selector board.

Rear panel

S

Fig.14

Power
transforme
board 2

Tie bands

Soldered sections b

Voltage
selector
board

Fig.15

(No.MB303)1-11

3.13 Removing the power transformer

r

r

(See Fig.16)

• 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.

CN811

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

power transformer board 2.

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

er.

3.14 Removing the power/fuse board

(See Fig.16)

• Prior to performing the following procedures, remove the top
cover.
(1) From the back side and top side of the main body, remove

the tie band from the bundling the wires and the power
cord.

(2) Remove the screw U and screw V attaching the power/fuse

board.

(3) Remove the solders from the soldered sections d attaching

the power cord.

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

solders from the soldered sections e attaching the wires.

and

Power
transformer
board 2

Tie band

CN811 CN55

Power
transforme
board 1

Power
transforme

TT

Tie band

V

Tie band

Soldered
sections c

Soldered sections e

Power/fuse board

Fig.16

U

Soldered
sections d

Power cord

1-12 (No.MB303)

3.15 Removing the power supply board

r

(See Fig.17)

• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, disconnect the parallel

wire 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 W attaching the power supply

board.

(5) Remove the power supply board from the hook f of the

chassis base bracket in the direction of the arrow, and take
out the power supply board.

(6) Turn over the power supply board, and remove the solders

from the soldered sections g attaching the wire.

on the power transformer

on the

on

Card wirePower supply board

Tie band

W

Headphone
jack board

CN55

W

Soldered
sections g

W

3.16 Removing the headphone jack board

(See Figs.17 and 18)

• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board and front panel assembly.
(1) From the top side of the main body, disconnect the parallel

wire from the connector CN881
Fig.17)

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

screw X attaching the headphone bracket to the front
bracket. (See Fig.18)

(3) Remove the three screws W attaching the power supply

board. (See Fig.17)

(4) Take out the headphone jack board from the inside of the

chassis base while lifting the power supply board.

3.17 Removing the switch board

(See Fig.19)

• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board and front panel assembly.
(1) From the back side of the front panel assembly, remove the

two screws Y attaching the switch board.

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

the connector CN432

on the switch board.

on the main board. (See

CN881

CN432

CN402

Main board

Nut h

Headphone bracket

Y

CN71

Relay board

Fig.17

Hook f

X

Headphone jack board

Front bracket

Fig.18

Front panel assembly CN430

Power
transforme
board 1

3.18 Removing the power switch board

(See Fig.19)

• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board and front panel assembly.
(1) From the back side of the front panel assembly, remove the

two screws Z attaching the power switch board.

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

from the connector CN430

on the power switch board.

Y

Switch board

Front video board

Fig.19

Z

Power switch board

(No.MB303)1-13

3.19 Removing the front key & system control board, front video board (See Figs.20 to 23)

• Prior to performing the following procedures, remove the top

cover, rear panel, I/O board, front panel assembly, switch
board and power switch board.
(1) From the front side of the front panel assembly, pull out the

volume and jog knobs, and remove the nut i attaching the
front key & system control board. (See Fig.20)

(2) From the back side of the front panel assembly, remove the

eight screws AA attaching the sub panel assembly. (See
Fig.21)

(3) Remove the wires of the front video board from the hook j

of the front panel assembly in the direction of the arrow 1.
(See Fig.21)

(4) Remove the sub panel assembly while releasing the four

claws k in the direction of the arrow 2. (See Figs.21 and 22)

(5) From the front side of the front panel assembly, disconnect

the wire from the connector CN412
tem control board, and take out the front video board. (See
Fig.23)

(6) Remove the claws m 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.23)

on the front key & sys-

Front panel assembly

Jog knob

AA

Volume knob

Nut i

Fig.20

Front panel assembly

1

2

AA

Claw k Claw k Claw k

Front video board

Sub panel assembly

Front key & System control board

2

Sub panel assembly

Fig.21

Fig.22

Claw mClaw m

CN412

Fig.23

2

Claw k

Hook j

Front panel assembly

Front panel assembly

Front video board

2

1-14 (No.MB303)

SECTION 4

ADJUSTMENT

4.1 Test mode

(1) Unplug the power plug.
(2) Insert power plug into outlet while pressing both "PRESET UP" key and "MIDLIGHT" key of the main body.
(3) Then, all segment of the FL display is blinking for 5 seconds, and tuner AM step is switching 9kHz.
(4) The high-speed of volume is checked by remote controller in the test mode.
(5) To release test mode, press "STANDBY/ON" key of the main body.

NOTE:

In the test mode, standby-LED is blinking for every 1 second.

4.2 Power amplifier section

Adjustment of idling current

Measurement location B2204

Adjustment part VR787

-B2205 (Lch) , B2213-B2214 (Rch)

(Lch) , VR788(Rch)

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, after you turn off amplifier and internal temperature falls.

< 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.

Front board (L)

VR787

B2204

B2205

VR787 (Lch)

Front board (R)

VR788

B2213

B2214

B2204, B2205 (Lch)

VR788 (Rch)

B2213, B2214 (Rch)

(No.MB303)1-15

SECTION 5

TROUBLESHOOTING

5.1 Self-diagnose function

This model incorporates the following self-diagnostic functions.

5.1.1 Starting of self-diagnostic mode

• Insert power plug into outlet while pressing both "PRESET UP" key and "INPUT ANALOG" key of the main body.
Then, "Self-diagnostic mode" starts.

5.1.2 Displaying of state

• When "Self-diagnostic mode" starts, system Micon version is displayed on the FL display.
Each turning MULTI JOG of the main body in the mode changes a state as follows.

FL display (Code)

S0001

D01

D02

D3

D4

D5

D6

D7

FL display State

2004030840

00.00.17

04/02/20

DspRev08

ANALOG02

Fs48kHz

PCM

2/0.0

System Micon version

DSP Micon version

Changed date of version

DSP version

Setting information

Setting information

Setting information

Channel information

FL display

1-16 (No.MB303)

Multi JOG

Preset up keyInput analog key

(No.MB303)1-17

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

(No.MB303)

Printed in Japan

WPC

SCHEMATIC DIAGRAMS

AUDIO/VIDEO CONTROL RECEIVER

RX-8040B

CD-ROM No.SML200407

Area suffix

UJ ---------------------- U.S.Military

Contents

Block diagram
Standard schematic diagrams
Printed circuit boards

COPYRIGHT 2004 Victor Company of Japan, Limited.

2-1
2-2 to 11
2-12 to 20

No.MB303SCH

2004/7

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.