Pioneer VSX-50 Service manual

PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan

PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936

PIONEER CORPORATION 2003

STANDBY/ON

PULL­OPEN

2

DIGITAL

DTS

2

VSX-50

PHONESADVANCEDNEO:6AUTO

PRO LOGICII

MASTER

SOUND MODE

INPUT SELECTOR

VOLUME

DOWN UP

AUDIO/VIDEO MULTI-CHANNEL RECEIVER

VSX-50

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

Model Type Power Requirement Remarks

VSX-50 KUXU/CA AC120V

This product is a system(s) component.

Component System Service Manual Remarks

DVD RECEIVER EX-500 RRV2798

AUDIO/VIDEO MULTI-CHANNEL RECEIVER VSX-50 RRV2797 This Manual

DVD PLAYER DV-50A RRV2740

ORDER NO.

RRV2797

For details, refer to "Important symbols for good services".

T-ZZK JULY 2003 printed in Japan

1234

SAFETY INFORMATION

A

This service manual is intended for qualified service technicians; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trained to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely, you
should not risk trying to do so and refer the repair to a qualified service technician.

WARNING

B

This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to
cause cancer, birth defects or other reproductive harm.
Health & Safety Code Section 25249.6 – Proposition 65

NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement
parts must be of identical designation.

REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)

C

Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que
les pièces de remplacement doivent avoir la même désignation.

(FOR USA MODEL ONLY)

1. SAFETY PRECAUTIONS

The following check should be performed for the
continued protection of the customer and service
technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground

(water pipe, conduit, etc.) by connecting a leakage

D

E

current tester such as Simpson Model 229-2 or
equivalent between the earth ground and all exposed
metal parts of the appliance (input/output terminals,
screwheads, metal overlays, control shaft, etc.). Plug
the AC line cord of the appliance directly into a 120V
AC 60 Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5 mA.

Reading should
not be above

0.5 mA

Earth
ground

Device
under
test

Also test with
plug reversed
(Using AC adapter
plug as required)

Test all
exposed metal
surfaces

Leakage
current
tester

AC Leakage Test

ANY MEASUREMENTS NOT WITHIN THE
LIMITS OUTLINED ABOVE ARE INDICATIVE
OF A POTENTIAL SHOCK HAZARD AND
MUST BE CORRECTED BEFORE RETURN­ING THE APPLIANCE TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are
often not evident from visual inspection nor the
protection afforded by them necessarily can be obtained
by using replacement components rated for voltage,
wattage, etc. Replacement parts which have these
special safety characteristics are identified in this
Service Manual.

Electrical components having such features are
identified by marking with a
on the parts list in this Service Manual.
The use of a substitute replacement component which
does not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.

Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER
Service Manual. A subscription to, or additional copies
of, PIONEER Service Manual may be obtained at a
nominal charge from PIONEER.

on the schematics and

F

2

1234

VSX-50

5678

[ Important symbols for good services ]

In this manual, the symbols shown-below indicate that adjustments, settings or cleaning should be made securely.
When you find the procedures bearing any of the symbols, be sure to fulfill them:

1. Product safety

You should conform to the regulations governing the product (safety, radio and noise, and other regulations), and
should keep the safety during servicing by following the safety instructions described in this manual.

2. Adjustments

To keep the original performances of the product, optimum adjustments or specification confirmation is indispensable.
In accordance with the procedures or instructions described in this manual, adjustments should be performed.

3. Cleaning

For optical pickups, tape-deck heads, lenses and mirrors used in projection monitors, and other parts requiring cleaning,
proper cleaning should be performed to restore their performances.

4. Shipping mode and shipping screws

To protect the product from damages or failures that may be caused during transit, the shipping mode should be set or
the shipping screws should be installed before shipping out in accordance with this manual, if necessary.

A

B

5. Lubricants, glues, and replacement parts

Appropriately applying grease or glue can maintain the product performances. But improper lubrication or applying
glue may lead to failures or troubles in the product. By following the instructions in this manual, be sure to apply the
prescribed grease or glue to proper portions by the appropriate amount.For replacement parts or tools, the prescribed
ones should be used.

C

D

56

VSX-50

E

F

7

8

3

1234

CONTENTS

SAFETY INFORMATION ..................................................................................................................................... 2

A

B

C

D

E

1. SPECIFICATIONS ............................................................................................................................................5

2. EXPLODED VIEWS AND PARTS LIST ............................................................................................................ 6

2.1 PACKING ................................................................................................................................................... 6

2.2 EXTERIOR SECTION................................................................................................................................ 8

2.3 INTERIOR SECTION............................................................................................................................... 10

2.4 FRONT PANEL SECTION ....................................................................................................................... 12

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM..........................................................................................14

3.1 BLOCK DIAGRAM ................................................................................................................................... 14

3.1.1 AUDIO BLOCK .................................................................................................................................. 14

3.1.2 VIDEO AND POWER SUPPLY BLOCKS .......................................................................................... 16

3.2 OVERALL WIRING DIAGRAM................................................................................................................. 18

3.3 VIDEO ASSY ........................................................................................................................................... 20

3.4 AUDIO INPUT ASSY ...............................................................................................................................22

3.5 MOTHER ASSY (1/5)............................................................................................................................... 24

3.6 MOTHER ASSY (2/5) and DSP KAWA ASSY .........................................................................................26

3.7 MOTHER ASSY (3/5)............................................................................................................................... 28

3.8 MOTHER ASSY (4/5)............................................................................................................................... 30

3.9 MOTHER ASSY (5/5)............................................................................................................................... 32

3.10 DSP ASSY (1/2)..................................................................................................................................... 34

3.11 DSP ASSY (2/2)..................................................................................................................................... 36

3.12 FRONT IN and AMP KAWA ASSYS ...................................................................................................... 38

3.13 6CH AMP ASSY .................................................................................................................................... 40

3.14 AMP OUT ASSY .................................................................................................................................... 42

3.15 ENCODER, FRONT and 1P-SW ASSYS ..............................................................................................44

3.16 PRIMARY, D5V, 12V and VHVL ASSYS ................................................................................................ 46

3.17 FM/AM TUNER MODULE...................................................................................................................... 48

4. PCB CONNECTION DIAGRAM ..................................................................................................................... 50

4.1 FM/AM TUNER MODULE........................................................................................................................ 51

4.2 AUDIO INPUT and 12V ASSYS............................................................................................................... 52

4.3 MOTHER, DSP KAWA and D5V ASSYS................................................................................................. 54

4.4 DSP ASSY ............................................................................................................................................... 58

4.5 FRONT IN ASSY...................................................................................................................................... 60

4.6 AMP KAWA ASSY ................................................................................................................................... 61

4.7 6CH AMP ASSY ...................................................................................................................................... 62

4.8 AMP OUT ASSY ...................................................................................................................................... 64

4.9 ENCODER, FRONT and 1P-SW ASSYS ................................................................................................66

4.10 PRIMARY ASSY .................................................................................................................................... 70

4.11 VHVL ASSY ........................................................................................................................................... 71

4.12 VIDEO ASSYS ....................................................................................................................................... 72

4.13 S-VIDEO ASSYS ...................................................................................................................................73

5. PCB PARTS LIST ...........................................................................................................................................74

6. ADJUSTMENT ............................................................................................................................................... 80

6.1 TUNER SECTION ....................................................................................................................................80

7. GENERAL INFORMATION............................................................................................................................. 81

7.1 DIAGNOSIS ............................................................................................................................................. 81

7.1.1 Test Mode .......................................................................................................................................... 81

7.1.2 Protection Circuit ...............................................................................................................................82

7.1.3 Specifications of Speaker Detection.................................................................................................. 83

7.1.4 Circuit Description ............................................................................................................................. 84

7.1.5 Troubleshooting.................................................................................................................................. 85

7.1.6 Timing Chart ......................................................................................................................................87

7.2 PARTS...................................................................................................................................................... 91

7.2.1 IC ....................................................................................................................................................... 91

7.2.2 DISPLAY ............................................................................................................................................ 97

7.3 CLEANING............................................................................................................................................... 98

8. PANEL FACILITIES ........................................................................................................................................ 99

F

4

1234

VSX-50

Amplifier section

Continuous average power output of 42 watts* per
channel, min., at 6 ohms, from 20 Hz to 20,000 Hz with
no more than 0.9 %** total harmonic distortion (front).

Continuous Power Output (

STEREO mode)

Front. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 W + 42 W

(FTC 20–20 kHz, THD 0.9 %, 6 Ω)

RMS Power Output

Front. . . . . . . . . . . . . . . . . .100 W/ch (1 kHz, THD 10 %, 6 Ω)

Center . . . . . . . . . . . . . . . . . .100 W ( 1 kHz, THD 10 %, 6 Ω)

Surround. . . . . . . . . . . . . .100 W/ch ( 1 kHz, THD 10 %, 6 Ω)

Surround back . . . . . . . . . . . 100 W ( 1 kHz, THD 10 %, 6 Ω)

Audio section

Input (Sensitivity/Impedance). . . . . . . . . . . . . . .200 mV/47 kΩ

Output (Level/Impedance)

DVR/VCR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200 mV/2.2 kΩ

* Measured pursuant to the Federal Trade Commission’s Trade
Regulation rule on Power Output Claims for Amplifiers.
** Measured by Audio Spectrum Analyzer.

Video section

Input (Sensitivity/Impedance). . . . . . . . . . . . . . . .1 Vp-p/75 Ω

Output (Level/Impedance). . . . . . . . . . . . . . . . . . 1 Vp-p/75 Ω

FM tuner section

Frequency Range . . . . . . . . . . . . . . . . 87.5 MHz to 108 MHz

Usable Sensitivity. . . . . . .Mono:13.2 dBf, IHF (1.3 µV/ 75 Ω)

50 dB Quieting Sensitivity . . . . . . . . . . . . . . .Mono: 20.2 dBf

Stereo: 38.6 dBf

Signal-to-Noise Ratio. . . . . . . . . . . .Mono: 76 dB (at 85 dBf)

Stereo: 72 dB (at 85 dBf)

Distortion. . . . . . . . . . . . . . . . . . . . . . . Stereo: 0.6 % (1 kHz)

Alternate Channel Selectivity . . . . . . . . . . . 60 dB (400 kHz)

Stereo Separation. . . . . . . . . . . . . . . . . . . . . . 40 dB (1 kHz)

Frequency Response . . . . . . . . . . . 30 Hz to 15 kHz (±1dB)

Antenna Input (DIN). . . . . . . . . . . . . . . . . .75 Ω unbalanced

AM tuner section

Frequency Range . . . . . 530 kHz to 1,700 kHz (10 kHz step)

Sensitivity (IHF, Loop antenna). . . . . . . . . . . . . . . .350 µV/m

Selectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 dB

Signal-to-Noise Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . .50 dB

Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Loop antenna

Miscellaneous

Power Requirements . . . . . . . . . . . . . . . . . . AC 120 V, 60 Hz

Power Consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . 170 W

In standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 W

Dimensions. . . . . . . . 16 /16 (W) x 2 /16 (H) x 15 /8 (D) in.

913 1

Weight (without package) . . . . . . . . . . . . . . . . . . . . . . .15 lb.

Furnished parts

Microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Microphone stand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Coaxial cable (black). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Video cable (yellow). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Audio cable (black). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Stereo audio cable (red/white). . . . . . . . . . . . . . . . . . . . . . . 1

SR mini-plug cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

SR+ mini-plug cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

AM loop antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

FM wire antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Power cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Dry cell batteries (AA size IEC R6P) . . . . . . . . . . . . . . . . . . 2

Remote control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Quick Setup Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Speaker cable labels. . . . . . . . . . . . . . . . . . . . . . . . . .1 sheet

Warranty card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Note

• Specifications and the design are subject to possible
modifications without notice, due to improvements.

Manufactured under license from Dolby Laboratories.
"Dolby", "Pro Logic", "Surround EX" and the double-D
symbol are trademarks of Dolby Laboratories.
"DTS", "DTS-ES Extended Surround", "Neo:6" and "DTS 96/
24" are trademarks of Digital Theater Systems, Inc.

FRONT

FRONT

FRONT

FRONT

CENTER

R

R

R

R

L

L

L

L

CENTER

SURROUND

SURROUND

SURROUND

SURROUND

SURROUND

BACK

SURROUND

BACK

Accessories

• Remote Control Unit
(AXD7363)

• Power Cable
(ADG7021)

• Microphone
(APM7004)

• Microphone stand
(AEB7313)

• SR+ mini-plug cable
(ADE7095)

• SR mini-plug cable
(PDE1297)

•

FM wire antenna
(ADH7004)

• AM loop antenna
(ATB7009)

• Coaxial cable (black)
Audio cable (black)
(ADE7087)

• Video cable (yellow)
(VDE1055)

• Stereo audio cable
(red/white)
(VDE1054)

• Speaker cable labels
(ARW7232)

• Dry Cell Battery
(AA size IEC R6P)
(VEM1030)

DVD RECEIVER

SOURCE

RECEIVER

SYSTEM OFF

OPEN/CLOSE

RECEIVER

SLEEP

DVD

TV/SAT

DVR/VCR

FM/AM SIGNAL

INPUT

SURROUND

ADVANCED
SURROUND

SOUND

MODE

SBch MODE

DISPLAY

DIALOG

AUTO STEREO

SUBTITLE ANGLE

PLAY MODEAUDIO

MUTE

MASTER
VOLUME

DTV MENU
TOP MENU

T.EDIT
MENU

RETURN

MCACC
SETUP

HOME
MENU

TUNE

TUNE

STST

RECEIVER

SETUP

BAND DTV ON/OFF

DISPLAY

/ +10

CLASS MPX D.ACCESS

ENTER

ENTER

CLEAR

CH SELECT

GUIDE

TEST TONE

TV CONTROL

CHANNEL

ZOOM

SURROUND
DIMMER

CHANNEL

VOLUME

INPUT

5678

1. SPECIFICATIONS

A

B

C

D

E

56

VSX-50

7

F

5

8

1234

2. EXPLODED VIEWS AND PARTS LIST

NOTES:

A

2.1 PACKING

B

22

21

C

Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
The mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
Screws adjacent to mark on product are used for disassembly.
For the applying amount of lubricants or glue, follow the instructions in this manual.
(In the case of no amount instructions, apply as you think it appropriate.)

1

2

4

5

6

3

9

23

24

24

27

D

E

24
24

26

27

25

20

15

19

17

14

11

13

12

18

16

F

6

1234

VSX-50

>

5678

PACKING parts List

Mark

No. Description Part No.

1 FM Wire Antenna ADH7004
2 AM Loop Antenna ATB7009

3 Power Cable ADG7021
4 Speaker Cable Label ARW7232
5 Operating instructions ARB7288
(English)

6 Quick Setup Guide ARH7079
(English)
7• • • • • •
8• • • • • •
NSP 9 Polyethylene Bag (A4x2) AHG7097
10 • • • • • •

11 Remote Control Unit AXD7363
12 Battery Cover AZA7424
NSP 13 Dry cell batteries (R6P,AA) VEM1030
NSP 14 Warranty Card ARY7007
15 Left Pad 301 AHA7407

A

B

16 Right Pad 301 AHA7408
17 Spacer AHB7088
18 Packing Sheet AHG7015
19 Packing Case AHD8169
20 SR+ mini-plug cable ADE7095

21 Microphone stand AEB7313
22 Microphone APM7004
23 Coaxial Cable ADE7087
24 Audio cable ADE7087
25 SR mini-plug cable PDE1297

26 Stereo audio cable VDE1054
27 Video cable VDE1055

C

D

E

56

VSX-50

F

7

8

7

1234

2.2 EXTERIOR SECTION

A

6

18

18

17

10

18

18

12

23

R

NON-CONTACT

18

18

18

1

SIDE

19

CONTACT SIDE

18

8

18

31

18

18

5

17

B

C

Refer to
"2.3 INTERIOR SECTION".

20

20

30

A

26

25

B

28

29

D

20

A

22

27

24

*Serial Number Label is put on
bottom of Under Base.

I

22

2

16

20

22

20

16

2214

E

20

Refer to
"2.4 FRONT PANEL SECTION".

F

20

A

18

3

O

20

22

4

14

15

9

21

13

22

20

15

22

8

1234

VSX-50

>

5678

EXTERIOR SECTION parts List

Mark

No. Description Part No.

1 FM/AM TUNER MODULE AXQ7245
2 6CH AMP Assy AWM7786
3 D5V Assy AWX8224
NSP 4 AMP MODULE 6CH AXQ7247
5 Bonnet Case AZN7934

6 Label ARW7223
7• • • • • •
8 Fan Cover AMR7446
9 Rear Panel 501SKU ANC8163
10 Tuner Barrier AEC7383

11 • • • • • •

12 AC Inlet Assy VKP2126
13 DC Fan Motor AXM7025
14 Fan Plate ANG7462
15 FET Bracket A ANG7418

NSP 16 Heat Sink ANH7161
17 Screw BCZ40P060FNI
18 Screw BBZ30P080FZK
19 Screw PPZ30P100FZK
20 Screw BBZ30P060FMC

A

B

C

21 Screw BBZ30P300FZK
22 Screw BBZ30P140FMC
23 J1905 13P FFC/60V ADD7402
NSP 24 Label VRW1629
25 VIDEO Assy AWX8248

NSP 26 PCB Spacer AEC7156
NSP 27 Energy Star Label AAX7876
28 J1911 19P FFC/60V ADD7422
NSP 29 Binder ZCA-BK1
30 S-VIDEO Assy AWX8185

31 SP Terminal Label ARW7229

D

E

56

VSX-50

F

7

8

9

1234

2.3 INTERIOR SECTION

A

B

B

22

H

32

31

I

31

4

F

E

5

L

H

B

31

31

P

3

12

M

23

I

M

F

D

D

28

C

1

31

N

31

31

17

N

31

16

F

31

7

E

13

14

31

18

A

31

C

6

33

19

D

31
24

31

L

34

31

33

N

A

32

C

D

31

NON-CONTACT

E

C

SIDE

8

J

H

CONTACT SIDE

9

31

31

25

10

Q

31

E

27

26

30

F

10

1234

VSX-50

29

>

>

5678

INTERIOR SECTION parts List

Mark

No. Description Part No.

1 AUDIO-INPUT Assy AWX8228
2• • • • • •
3 12V Assy AWX8170
4 DSP Assy AWX8239
5 DSP KAWA Assy AWX8257

6 PRIMARY Assy AWX8244
7 MOTHER Assy AWX8212
8 AMP KAWA Assy AWX8223
9 AMP OUT Assy AWX8229
10 VHVL Assy AWX8260

11 • • • • • •
12 J1911 19P FFC/60V ADD7422
13 J1906 10P FFC/60V ADD7405
14 J1909 19P FFC/60V ADD7422
15 • • • • • •

16 J1901 17P FFC/60V ADD7398
17 J1904 17P FFC/60V ADD7401

18 FU1 Fuse (6.3A) REK1069

19 T1 Power Transformer ATS7351
20 • • • • • •

A

B

C

21 • • • • • •
22 Core Stay A ANG7447
23 Core Stay B ANG7448
24 Jack Stay ANG7450
25 Trans Frame ANG7446

NSP 26 Under Base ANA7151
27 PCB Support AEC7365
28 PCB Mold AMR2533
NSP 29 PC Support VEC1749
30 Foot REC-434

31 Screw BBZ30P060FMC
32 Screw BCZ40P060FNI
33 Screw BBZ30P180FMC
NSP 34 Fuse Card AAX2374

D

E

56

VSX-50

F

7

8

11

1234

2.4 FRONT PANEL SECTION

A

22

19

B

8

C

28

7

11

10

21

G

1

6

31

23

14

26

M

5

22

2

18

22

12

12

17

22

27

22

15

29

L

20

3

22

22

16

22

K

4

24

11

10

NON-CONTACT

SIDE

CONTACT SIDE

D

E

F

28

30

25

13

Accessories of
No. 4 ENCORDER ASSY

12

1234

VSX-50

5678

FRONT PANEL SECTION parts List

Mark

No. Description Part No.

1 FRONT IN Assy AWX8246
2 1P-SW Assy AWX8206
3 FRONT Assy AWX8214
4 ENCODER Assy AWX8207
5 Front Panel Assy AXG7194

NSP 6 Front Panel AMB7843
NSP 7 Power Button AAD7696
8 Name Plate B PAN1376
9• • • • • •
10 Insulator Ring AAK8091

11 Rubber Foot VEB1325
12 VOL Ring ABH7220
13 Volume Knob S Assy AAB7258
14 Select Knob S Assy AAB7259
15 LED Lens 501 AAK8088

16 J1903 9P FFC/60V ADD7400
17 J1902 15P FFC/60V ADD7399
18 J1911 19P FFC/60V ADD7422
19 Jack Cover AMR7447
20 Front Frame ANG7445

A

B

C

21 FL Lens 501 AAK8087
22 Screw PPZ30P080FMC
23 Door Spring ABK7041
24 Earth Plate ANG7466
25 Door 501 AAK8090

26 LED Plate 501KU AAK8094
27 FL Filter AAK8104
28 Rubber Sheet AEB7054
29 LED Lens Holder AMR7448
30 Door Sheet AMR7449

31 Hologram Label ARW7239

D

E

56

VSX-50

F

7

8

13

1234

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM

3.1.1 AUDIO BLOCK

A

FRONT IN ASSY (3/3)

R

FM/AM TUNER
MODULE

AXQ7245

FRONT IN

G

B

ASSY (1/3)

G

29

28

C

IC704

D

24
23

21

27

IC701

20

AUDIO INPUT

C

ASSY

IC705

22

19

IC702

57

75

75

5

7

7

6

13

75

75

E

DSP
KAWA

351

E

7

32

232224

28 26

ASSY

28

9

FRONT IN

G

ASSY (2/3)

32

67812

4567

F

F

14

1234

DSP
ASSY

VSX-50

5678

A

B

2

H

AMP KAWA ASSY

17

28

13

11

31

13

15

29

75

9

32

13

1

6

1

6

16

18

C

D

6CH AMP

I

ASSY

J

D

MOTHER ASSY

AMP OUT
ASSY

E

56

VSX-50

F

7

8

15

1234

3.1.2 VIDEO AND POWER SUPPLY BLOCKS

A

S2 VIDEO INPUT

DVD

TV/BS

B

DVR/VTR

VIDEO

C
Y

C

Y

C

Y

C

Y

A

C

VIDEO INPUT

DVD

TV/BS

DVR/VTR

VIDEO

IC2401 NJM2596M

C/DC SELECTOR

VIN1

14

VIN3

19

VOUT1

10

VIN2

16

VIN4

1

IC2402 NJM2296M

Y SELECTOR

13

VIN1

7

VIN3

VOUT1

9

VIN2

5

VIN4

1

S-VIDEO ASSY

IC2501 NJM2296M

FUNCTION SELECTOR

VIN1

13

VOUT3

11

VIN3

7

VIN2

9

VOUT1

VIN5

3

1

VIN4

5

C

Y

S2 VIDEO OUTPUT

(to TV)

VIDEO OUTPUT

DVR/VTR

(to TV)

VIDEO

B

ASSY

CN2501 12

D

CN9001

8

MOTHER

D

ASSY

FRONT

E

F

FRONT IN

G

ASSY

CN1204

CN4102

5

15

16

1234

VSX-50

5678

POWER LINE

D

P

12V ASSY

I

6CH AMP
ASSY

MOTHER ASSY

C

AUDIO
INPUT
ASSY

D622-D625

Q

VHVL ASSY

N

PRIMARY ASSY

A

B

C

DSP ASSY

F

D

MOTHER ASSY

D

E

F

56

VSX-50

7

8

17

1234

3.2 OVERALL WIRING DIAGRAM

A

A

S-VIDEO ASSY
(AWX8185)

B

AC POWER CORD
ADG7021

AC INLET ASSY
VKP2126

N

C

PRIMARY ASSY
(AWX8244)

B

VIDEO ASSY
(AWX8248)

12V ASSY

P

(AWX8170)

C

AUDIO INPUT ASSY
(AWX8228)

D

MOTHER ASSY
(AWX8212)

D 1/5- D 5/5

CN8003CN8007

D

J4101
ADX7442

E

F

G

FRONT IN ASSY
(AWX8246)

M

1P­SW ASSY
(AWX8206)

L

F

DSP ASSY (AWX8239)

FRONT ASSY
(AWX8214)

F 1/2- F 2/2

CN8012

18

1234

VSX-50

5678

Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".

R

FM/AM
TUNER
MODULE
ASSY

AMP OUT ASSY

J

(AWX8229)

H

AMP KAWA ASSY
(AWX8223)

DC FAN MOTOR
AXM7025

(AXQ7245)

I

6CH AMP ASSY
(AWM7786)

A

B

C

E

DSP KAWA
ASSY
(AWX8257)

D5V ASSY

O

(AWX8224)

Q

VHVL ASSY
(AWX8260)

ENCODER ASSY
(AWX8207)

D

E

K

56

VSX-50

F

7

8

19

1234

3.3 VIDEO ASSY

A

B

S-VIDEO ASSY (AWX8185)

A

S-VIDEO BLOCK

C

D

IC2402 NJM2296M

E

F

A

20

1234

VSX-50

5678

A

VIDEO BLOCK

B

IC2501 NJM2296M

VIDEO ASSY (AWX8248)

CN9001

D 1/5

B

C

REAR PANEL

: VIDEO SIGNAL ROUTE

: The power supply is shown with the marked box.

D

E

F

56

VSX-50

B

7

8

21

1234

3.4 AUDIO INPUT ASSY

A

(A)

AUDIO INPUT ASSY

C

(AWX8228)

(A)(A)

(A)

B

(A)

(A)

C

D

(D)

E

F

(D)

(D)

(D)

(D)

(A)

22

C

CN1263

D 2/5

1234

VSX-50

5678

A

(A)

(A)

(A)

B

CN1262

D 2/5

C

CN1207

(A)(A)

601

P

CAUTION : FOR CONTINUED PROTECTION

AGAINST RISK OF FIRE.
REPLACE ONLY WITH SAME TYPE
NO. 49102.5 FOR IC820 AND IC821
MFD, BY LITTELFUSE INC.

From
T1 PT

(A)

: AUDIO SIGNAL ROUTE (ANALOG)

(D)

: AUDIO SIGNAL ROUTE (DIGITAL)

: The power supply is shown with the marked box.

D 3/5

D

E

F

56

VSX-50

C

7

8

23

1234

3.5 MOTHER ASSY (1/5)

A

B

CN201

R

D 2/5

C

CN2501

B

D

D 2/5

E

F

D 1/5

24

: The power supply is shown with the marked box.

VSX-50

1234

N

CN551

5678

CN4203

L

A

DC DETECT: 3-4V
OVERLOAD DETECT: 2-3V
Short-circuit Fan and Power
supply circuit: less than 2V
(VH/VL)

D 1/5

MOTHER ASSY (AWX8212)

B

C

D 3/5

D 2/5

D 2/5

D

E

56

VSX-50

F 2/2

7

CN8012

F

D 1/5

25

8

1234

3.6 MOTHER ASSY (2/5) and DSP KAWA ASSY

A

D 4/5

D 1/5

(A)(A)

(A)(A)

D 1/5

NORMAL : 0V
OVERLOAD : 5V

(A)

CN4102

B

G

(A)

D 1/5

IATT
ON : +12V
OFF : -12V

INPUT ATT

C

A/D OVERLOAD
DETECT

CN701

C

(A)(A)

(A)

(A)

D 1/5

D

(A)

(A)

(D)

CN901

C

(A)

E

(A)

(A)

(A)

E

DSP KAWA ASSY
(AWX8257)

F

D 2/5

26

(D)

F 1/2

CN8017

E

1234

F 1/2

CN8003

VSX-50

(A)

F 1/2

(A)

CN8007

5678

D 2/5

MOTHER ASSY (AWX8212)

LOW PASS FILTER

(A)

(A)

: AUDIO SIGNAL ROUTE (ANALOG)

(D)

: AUDIO SIGNAL ROUTE (DIGITAL)

(A)

A

B

C

(A)

(A)

(A)

(A)

For SP CONFIG.
MIX AMP

(A)

D 3/5

D

E

: The power supply is shown with the marked box.

VSX-50

56

F

D 2/5

7

8

27

1234

3.7 MOTHER ASSY (3/5)

A

D 3/5

B

MOTHER ASSY (AWX8212)

D 1/5

D 2/5

(A)

(A)

C

(A)

(A)

J701

C

D

E

D 1/5

F

D 3/5

28

1234

VSX-50

5678

A

(A)

(A)

D 4/5

(A)

(A)

B

(A)

C

(A)

: AUDIO SIGNAL ROUTE (ANALOG)

D

E

F

56

VSX-50

D 3/5

7

8

29

1234

3.8 MOTHER ASSY (4/5)

A

D 4/5

MOTHER ASSY (AWX8212)

(A)(A)

B

(A)(A)

C

(A)

D 3/5

D

E

F

D 4/5

30

1234

VSX-50