Onkyo TX-HT-R490 Service Manual

TX-DS494/HT-R490

Ref. No.3676

SAFETY-RELATED COMPONENT
WARNING!!

COMPONENTS IDENTIFIED BY MARK ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.

052001

SERVICE MANUAL

AV RECEIVER

TX-DS494/HT-R490

STANDBY/ON

OFF

ON

POWER

PHONES

MASTER VOLUME

BASS

TREBLE

AV RECEIVER

TX-DS

494

FM

AM

PHONO

C

D

TAPE

VIDEO

1

DVD

ABSPEAKERS

DIMMER

SURROUND

DTS/

VIDEO

2

VCR

AUDIO

SELECTOR

LISTENING MODE

DSP

STEREO

DISPLAY

STANDBY

SP SEL TUNING PRESET

MEMORY

SW MODE

DIGITAL

INPUT

FM

MODE

CLEAR

R

C

-

4

4

4

M

R

E

M

O

T

E

C

O

N

T

R

O

L

L

E

R

INPUT SELECTOR

SLEEP DIMMER DISPLAY

CD TAPE PHONO TUNER

DV D VIDEO 1 VIDEO 2

SUR MODE

SW MODE AUDIO SEL

TUNER
PRESET

STANDBY/ON

DISC

MUTING

DVD CD TAPE

VOLUME

TOP MENU

MENU

CH SEL

RETURN

SETUP

TEST TONE

LEVEL

ENTER

MODE

TV CABLE SATELLITE

VCR

STANDBY/ON

CH

TV/VCR

CH TV VOL

TV VOL

BMDD
BMPP,SMPP,BMPA,GMPA
BMWT,BMWR,GMWT,GMWR
GMGT

120V AC, 60Hz
230-240V AC, 50Hz
120/220-230V AC, 50/60Hz
220-230V AC 50/60Hz

HT-R490

TX-DS494

120V AC,60Hz

Black,Silver and Golden model

Black model

TX-DS494/HT-R490

SEPECIFICATIONS

############

AMPLIFIER SECTION

Continuous Average Power output (FTC)

All channels:

55 watts per channel min. RMS at 8 ohms,
2 channels driven from 20 Hz to 20 kHz
with no more than 0.08% total harmonic
distortion.
70 watts min. RMS at 6 ohms, 2 channels
driven from 1 kHz with no more than

0.1% total harmonic distortion.

Continuous Power output (DIN) 75 watts 5 at 6 ohms
Maximum Power output (EIAJ) 100 watts 5 at 6 ohms
Total Harmonic Distortion: 0.08% at rated power (Front)
IM Distortion: 0.08% at rated power (Front)
Damping Factor: 60 at 8 ohms (Front)
Input Sensitivity and Impedance

PHONO: 2.5 mV, 50 kohms
LINE (CD, TAPE, DVD, VIDEO 1, 2):

200 mV, 50 kohms

MULTICHANNEL INPUT

(FRONT L/R, SURROUND L/R,
CENTER)

:

200 mV, 50 kohms

(SUBWOOFER): 36 mV, 50 kohms

DIGITAL 2 (COAXIAL): 0.5 Vp-p, 75 ohms

Output Level and Impedance

Rec out (TAPE, VIDEO 2): 200 mV, 2.2 kohms

Pre out (SUBWOOFER): 1 V, 2.2 kohms
Phono Overload: 110 mV RMS at 1 kHz, 0.5% T.H.D.
Frequency Response: 20 Hz to 100 kHz, +1/Ð3 dB
RIAA Deviation: 20 Hz to 20 kHz, ±0.8 dB
Tone Control

Bass: ±10 dB at 50 Hz

Treble: ±10 dB at 10 kHz
Signal-to-Noise Ratio

Phono: 80 dB (IHF-A, 5 mV input)

CD/Tape: 100 dB (IHF-A)

VIDEO SECTION

Input Sensitivity and Impedance

VIDEO (DVD, VIDEO 1, 2): 1 Vp-p, 75 ohms

S VIDEO (DVD, VIDEO 1, 2):

1 Vp-p, 75 ohms (Y)

0.28 Vp-p, 75 ohms (C)

Output Level and Impedance

VIDEO (VIDEO 2, MONITOR):

1 Vp-p, 75 ohms

S VIDEO (MONITOR): 1 Vp-p, 75 ohms (Y)

0.28 Vp-p, 75 ohms (C)

TUNER SECTION

FM
Tuning Range: 87.5-108.0 MHz (50 kHz steps)
Usable Sensitivity

Mono: 11.2 dBf, 1.0 µV (75 ohms)

Stereo: 17.2 dBf, 2.0 µV (75 ohms)
50 dB Quieting Sensitivity

Mono: 17.2 dBf, 2.0 µV (75 ohms)

Stereo: 37.2 dBf, 2.0 µV (75 ohms)

Capture Ratio: 2.0 dB
Image Rejection Ratio

North American models: 40 dB

Other models: 85 dB
IF Rejection Ratio: 90 dB
Signal-to-Noise Ratio

Mono: 76 dB

Stereo: 70 dB
Alternate Channel Attenuation: 55 dB
Selectivity: 50 dB (DIN)
AM Suppression Ratio: 50 dB
Total Harmonic Distortion

Mono: 0.2%

Stereo: 0.3%
Frequency Response: 30 Hz-15 kHz, ±1.0 dB
Stereo Separation: 45 dB at 1 kHz

30 dB at 100 Hz-10 kHz

AM

Tuning Range

North American models: 530-1,710 kHz (10 kHz steps)

European & Australian models:

522-1,611 kHz (9 kHz steps)

Worldwide models: 531-1,602 kHz (9 kHz steps),

530-1,710 kHz (10 kHz steps)
Usable Sensitivity: 30 µV
Image Rejection Ratio: 40 dB
IF Rejection Ratio: 40 dB
Signal-to-Noise Ratio: 40 dB
Total Harmonic Distortion: 0.7%

GENERAL

Power Supply: AC 120 V, 60 Hz

AC 230-240 V, 50 Hz

AC 220-230 V and 120 V switchable,

50/60 Hz
Power Consumption: 3.4 A

260 W
Dimensions (W H D): 435 150 339 mm

17-1/8" 5-7/8" 13-3/8"
Weight

North American models: 9.7 kg, 21.4 lbs.
European & Australian models:

10.3 kg, 22.7 lbs.

Worldwide models: 10.9 kg, 24.0 lbs.

REMOTE CONTROL

Transmitter: Infrared
Signal range: Approx. 5 meters, 16 ft.
Power supply: Two "AA" batteries (1.5 V 2)

Specifications and features are subject to change without notice.
Power supply and voltage vary depending on the area in which the unit is
purchased.

*

*

*

*

: TX-DS494 only

[NOTES]

TX-494/HT-R490

C7003

Q7001

Q7001

R7010

R7017
R7018

R70

19

R7020
R7021

R7022

R7023 R7024

R7025R7026

R7027R7028

R7029
R7030

R7031

R7032
R7034

R7037

R7049

R7051

R7052

R7053

R7054

R7055

R7056
R7057
R7058

R7090

R7107

R7108

R7153

R7151

R7156

R7157

1

ANTENNA

FM
75

AM

REMOTE
CONTROL

CENTER
SPEAKER

SURROUND
SPEAKERS

R

L

IN

IN IN

L

L

R

FRONT

CENTER

SURR

SUB
WOOFER

RL

1

2

COAXIAL

CAUTION:
SPEAKER IMPEDANCE

6 OHMS MIN. PER EACH
SPEAKER TERMINAL

OUT

IN

A

B

R

L

FRONTSPEAKERS

R

L

R

L

IN

OUT

VIDEO

DIGITALINPUT

MONITOR
OUT

SVIDEO

DVD

VIDEO1

VIDEO 2

PHONO

CD

SUB
WOOFER
PRE OUT

TAPE

DVD

VIDEO 2

VIDEO 1

R

L

OPTICAL

IN

IN

MULTI
CHANNEL INPUT

MONI­TOR
OUT

GND

120V

VOLTAGE SELECTOR

220-230V

SWITCHED

TOTAL 100W MAX.

AC OUTLETS

AV RECEIVER

MODEL NO.

TX-DS494

RATING:

50/60Hz 260W

AC 120/220-230V

10kHz
9kHz

AM FREQUENCY

STEP

10k Hz

9kHz

AM FREQUENCY

STEP

ANTENNA

FM
75

AM

REMOTE
CONTROL

CENTER
SPEAKER

SURROUND
SPEAKERS

R

L

IN

IN IN

L

L

R

R

FRONT

CENTER

SURR

SUB
WOOFER

RL

1

2

COAXIAL

CAUTION:

SPEAKER IMPEDANCE

6 OHMS MIN. PER EACH

SPEAKER TERMINAL

OUT

IN

A

B

R

L

FRONTSPEAKERS

R

L

R

L

IN

OUT

VIDEO

DIGITALINPUT

MONITOR
OUT

SVIDEO

DVD

VIDEO1

VIDEO 2

PHONO

CD

SUB
WOOFER
PRE OUT

TAPE

DVD

VIDEO 2

VIDEO 1

R

L

OPTICAL

IN

IN

MULTI
CHANNEL INPUT

MONI­TOR
OUT

GND

120V

VOLTAGE SELECTOR

220-230V

SWITCHED

TOTAL 100W MAX.

AC OUTLETS

AV RECEIVER

MODEL NO.

TX-DS494

RATING:

50/60Hz 260W

AC 120/220-230V

10kHz

9kHz

AM FREQUENCY

STEP

120V

VOLTAGE SELECTOR

220-230V

1. Replacing the fuses

3. Safety-check out

(Only U.S.A. model)
After correcting the original service problem perform the
following safety check before releasing the set to the customer
Connect the insulating-resistance tester between the plug of
power supply cord and terminal GND on the back panel.
Specifications: More than 10Mohm at 500V

This symbol located near the fuse indicates that the
fuse used is show operating type, For continued protection against
fire hazard, replace with same type fuse , For fuse rating, refer to
the marking adjest to the symbol.

Ce symbole indique que le fusible utilise est e lent.
Pour une protection permanente, n'utiliser que des fusibles de meme
type. Ce demier est indique la qu le present symbol est apposre.

1. Press and the hold down the VIDEO 1 button , then press the
SPEAKER A button when the nuit is Power ON.

2. After " CLEAR " is displayed, the preset memory and each mode
stored in the memory, are initialized and will return to the
factory settings.

2. To initialize the unit

This unit does not require memory preservation batteries. A built-in
memory power back-up system preserves the contents of the
memory during power failures and even when the unit is un-plugged.
The unit must be plugged in order to charge the back-up
system.
The memory preservation period after the unit has been unplugged
varies depending on climate and placement of the unit. On the
average, memory contents are protected over a period of a few
weeks after the last time the unit has been unplugged. This pe-riod
is shorter when the unit is exposed to a highly humid cli-mate.

F911

252166 6.3A-UL/T-237, Fuse <DD,WT,WR,490>

F922

252077 or 4A-SE-EAK or
252243 4A-SE-TL250V, Fuse <PP,WT,WR,GT,PA>

F923

252075 2.5A-SE-EAK, Fuse <PP>

[NOTE]

<DD> : 120V model only

<DT> : Asian model only for 120V
<GT> : Asian model only for 230V

<PP> : European model only
<WT> : World wide model only
<WR> : Chinese model only
<490> : HT-R490 only

REF. NO. PART NO. DESCRIPTION

This device employs a microprocessor to perform various
functions and operations. If interference generated by an external
power supply, radio wave, or other electrical souce results in accident
which causes the specified operations and functions to operate
abnormally.
To perform a result, please follow the procedure below.

With the exception of the worldwide models, a tuning step selector
switch is not provided. When you change the band step, change
the parts as shown below.

To 10kHz To 9kHz
R7020 Open 10k
R7021 10kohm 8.2kohm

4. Memory Preservation

7. Changing the AM band step

5.Setting the AM tuning step frequency

(World wide models only)

6.Setting the voltage selector

(Worldwide models only)

Worldwide models are equipped with a switch that controls
the AM band tuning step. Please set this switch to match the
AM band tuning step frequency in your area.

World models are equipped with a voltage selector
conform with local power supplies. Be sure to set this switch to
match the voltage of the power supply in your area before
plugging in the unit.
Determine the proper voltage for your area: 230V or 120V.
If the preset voltage is not correct for your area, insert a screwdriver
into the groove in the switch. Slide the switch all the way to the right
(120V) or to the left(220V-230V), whichever is appropriate.

NADIS-7043 (Display circuit PC board)

From soldering side

Microprocessor

SERVICE PROCEDURES

TX-DS494/HT-R490

EXPLODED VIEW-1

MAIN PART

27

U8

E891

28

P901

(PP,PT type)

P901

(DD type)

30

30

30

Q921

Q922

Q933

3

U15

6

38

36

Q526

Q524

E811

21

Q518

D910

18

24

15

45

20

14

47

46

T901

12

7

8

F911

F922

E811

Q1513

Q1512

39

41

37

29

P101

U23

U20

U21

U3

4

U19

U13

17

U5

U1

U2

U18

U4

3

17

U12

U6

U14

17

3

3

3

3

3

3

3

44

40

F933

26

TX-DS494/HT-R490

EXPLODED VIEW-2

FRONT PART

43

30

U10

U11

1

30

30

3

3

3

U9

U16

U17

U7

33

4

3

3

50

32

34

3

42

48

P7001

P702

49

2

3

TX-DS494/HT-R490

REF. NO. PART NO. DESCRIPTION

1 27111200 Front bracket <B>

27111201 Front bracket <S>

27111202 Front bracket <G>
2 27141787 Retainer, HP
3 838130088

3TTB+8B, Self tapping screw
4 82143010 3P+10FN(BC), Self tapping screw
6 27100368B Chassis
7 27190266

KGLS-12RF, Holder
8 27190428A KGLS-10RF, Holder
9 27190813 KGPS-10RF, Holder

12 830440089 4TTC+8C(BC), Self tapping screw
14 27300750 Bushing, cord #2271 <DD,PP,WR,WT, PA,GT>
15 27160435 Heat sink L
17 801433

3SMS8W.SW+14B(BC), Special screw

18 27141681 Retainer, PWB
20 27141735 Retainer, Rear
21 27141734 Retainer, Front
24 27160436A Heat sink S
25 82143010

3P+10FN(BC) Pan head screw

26 29362772 Label, cover
27 27141729 Retainer, S
28 838430068

3TTB+6B(BC), Self tapping screw

29 29110083 Tape, Cross-16U
32 27215357 Decorative frame <B>

27215359 Decorative frame <S>
27215358 Decorative frame <G>

33 28325497A Knob, power <B>

28325547A Knob, power <S>
28325499A Knob, power <G>

34 28191911 Clear plate <B>

28191912 Clear plate <S,G>

36 28184663-1 Top cover <B>

28184666 Top cover <S>

28184682 Top cover <G>
37 28141408 Cushion
38 838430088

3TTB+8B(BC), Self tapping screw <B>

838930088 3TTB+8B(UN), Self tapping screw <S, G>
39 27175319A Leg
40 28141332 Cushion, leg
41 831430088 3TTW+8B(BC), Self tapping screw
42 28325641 Knob, Volume <B>

28325642 Knob, Volume <S>

28325643 Knob, Volume <G>
43 28325405 Knob, tone <B>

28325474 Knob, tone <S>

28325407 Knob, tone <G>
44 27191130 Holder, outlet <WR>

45 27122810 Rear panel <DD>

27122811 Rear panel <PP>
27122813 Rear panel <WT>
27122814 Rear panel <WR>
27122815 Rear panel <PA>
27122812 Rear panel <GT>
27122824A Rear panel <490>

46 87643010

W3*10F(BC), Flat washer
47 838930088 3TTB+8B(UN), Self tapping screw
48 27212285 Front panel <B> <DD, WT, WR, PA>

27212286 Front panel <B> <PP>
27212287 Front panel <S> <PP>
27212288 Front panel <G> <PA, WR, WT, GT>

27212292 Front panel <490>
49 28198778 Facet
50 28135244 Badge <B>

28135245 Badge <S,G>

D910 22380038 or RBV602 or

22380274

RS603M, Diode
E811 223024 Isolated sheet, AC238
E891 880048

P-3055B-8L, Plastic rivet
F911 252166 6.3A-UL/T-237, Fuse <DD,WT,WR,490>
F922 252077 or 4A-SE-EAK or

252243 4A-SE-TL250V, Fuse <PP,WT,WR,GT,PA>
F923 252075 2.5A-SE-EAK, Fuse <PP>
P101 2047151512 NCFC7-151512, Flexible flat cable

P7001 2047252012 NCFC7-252012, Flexible flat cable

P702 2047202022 NCFC7-202022, Flexible flat cable

REF. NO. PART NO. DESCRIPTION

[NOTE]

<DD> : 120V model only

<DT> : Asian model only for 120V
<GT> : Asian model only for 230V

<PP> : European model only
<WT> : World wide model only
<WR> : Chinese model only
<494> : TX-DS494 only
<490> : HT-R490 only

<B> : Black model only
<S> : Silver model only
<G> : Golden model only

NOTE: THE COMPONENTS IDENTIFIED BY MARK
ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH
PART NUMBER SPECIFIED.

EXPLODED VIEW PARTS LIST-1

TX-DS494/HT-R490

U1 1A865589-2A NAAF-6789-2A, Front channel power amplifier PC board ass'y <DD>

1A865589-2B NAAF-6789-2B, Front channel power amplifier PC board ass'y <PP,PA, GT>
1A865589-2C NAAF-6789-2C, Front channel power amplifier PC board ass'y <490>
1A865589-2D NAAF-6789-2D, Front channel power amplifier PC board ass'y <WT, WR>

U2 1A865590-2A NAAF-6790-2A, Surround channel power amplifier PC board ass'y <DD>

1A865590-2B NAAF-6790-2B, Surround channel power amplifier PC board ass'y <PP,PA, GT>
1A865590-2C NAAF-6790-2C, Surround channel power amplifier PC board ass'y <490>
1A865590-2D NAAF-6790-2D, Surround channel power amplifier PC board ass'y <WT, WR>

U3 1A865591-2A NAETC-6791-2A, Front speaker terminal PC board ass'y <DD>

1A865591-2B NAETC-6791-2B, Front speaker terminal PC board ass'y <PP,PA, GT>
1A865591-2C NAETC-6791-2C, Front speaker terminal PC board ass'y <490>
1A865591-2D NAETC-6791-2D, Front speaker terminal PC board ass'y <WT, WR>

U4 1A865592-2A NAETC-6792-2A, Surround speaker terminal PC board ass'y <DD>

1A865592-2B NAETC-6792-2B, Surround speaker terminal PC board ass'y <PP,PA, GT>
1A865592-2C NAETC-6792-2C, Surround speaker terminal PC board ass'y <490>
1A865592-2D NAETC-6792-2D, Surround speaker terminal PC board ass'y <WT, WR>

U5 1A865594-2A NAETC-6794-2A, Holder PC board ass'y <DD>

1A865594-2B NAETC-6794-2B, Holder PC board ass'y <PP,PA, GT>
1A865594-2C NAETC-6794-2C, Holder PC board ass'y <490>
1A865594-2D NAETC-6794-2D, Holder PC board ass'y <WT, WR>

U6 1A865595-2A NAETC-6795-2A, Secondary terminal PC board ass'y <DD>

1A865595-2B NAETC-6795-2B, Secondary terminal PC board ass'y <PP,PA, GT>
1A865595-2C NAETC-6795-2C, Secondary terminal PC board ass'y <490>
1A865595-2D NAETC-6795-2D, Secondary terminal PC board ass'y <WT, WR>

U7 1A899543-1A NADIS-7043-1A, Display circuit PC board ass'y <DD>

1A899543-1B NADIS-7043-1B, Display circuit PC board ass'y <PP>
1A899543-1C NADIS-7043-1C, Display circuit PC board ass'y <PA,GT>
1A899543-1D NADIS-7043-1D, Display circuit PC board ass'y <WT,WR>
1A899543-1F NADIS-7043-1F, Display circuit PC board ass'y <490>

U8 1A899544-1A NAAR-7044-1A, Main PC board ass'y <DD>

1A899544-1B NAAR-7044-1B, Main PC board ass'y <PP>
1A899544-1C NAAR-7044-1C, Main PC board ass'y <PA,GT>
1A899544-1D NAAR-7044-1D, Main PC board ass'y <WT,WR>
1A899544-1F NAAR-7044-1F, Main PC board ass'y <490>

U9 1A899545-1A NAETC-7045-1A, Head phone jack PC board ass'y <DD>

1A899545-1B NAETC-7045-1B, Head phone jack PC board ass'y <PP>
1A899545-1C NAETC-7045-1C, Head phone jack PC board ass'y <PA,GT>
1A899545-1D NAETC-7045-1D, Head phone jack PC board ass'y <WT,WR>
1A899545-1F NAETC-7045-1F, Head phone jack PC board ass'y <490>

U10 1A899546-1A NAETC-7046-1A, Master volume PC board ass'y <DD>

1A899546-1B NAETC-7046-1B, Master volume PC board ass'y <PP>
1A899546-1C NAETC-7046-1C, Master volume PC board ass'y <PA,GT>
1A899546-1D NAETC-7046-1D, Master volume PC board ass'y <WT,WR>
1A899546-1F NAETC-7046-1F, Master volume PC board ass'y <490>

REF. NO. PART NO. DESCRIPTION

REF. NO. PART NO. DESCRIPTION

Q523, Q524 ,
Q1512

2202253 or 2SC4467-O or

Q623, Q624

2202254 or 2SC4467-Y or
2202256 or 2SC4467-P or
2203042 or 2SC5197-R or
2203043 or 2SC5197-O or
2203502 or KTD718-R or

2203503 KTD718-O, Transistor
Q525, Q526 ,
Q1513

2202243 or 2SA1694-O or

Q625, Q626

2202244 or 2SA1694-Y or

2202246 or 2SA1694-P or

2203032 or 2SA1940-R or

2203033 or 2SA1940-O or

2203492 or KTB688-R or

2203493 KTB688-O, Transistor
Q517, Q518 2212654 or 2SC3421-Y or

2212653 2SC3421-O, Transistor
Q921 222780125 78M12HF, IC
Q922 222790125 79M12HF, IC
Q933 222780055 78M05HF, IC

T901 2301438 NPT-1384D, Power transformer

<DD, 490>

2301440 NPT-1384P, Power transformer

<PP, PA>

2301441 NPT-1384DG, Power transformer

<WT, WR, GT>

P901 253279HIT AS-UC-2#18 or

253280VOL AS-UC-2#18 <DD>

253306VOL or AS CEE-2 or

253193HIT AS-CEE <PP, GT>

253197HIT or AS-SAA or

253307VOL AS-SAA <PA>

253233KAW or AS-CEE-2 or

253306VOL AS-CEE-2 <WT>

253267KAW, AS-CCEE,

253285HIT or AS-CCEE or

253286VOL AS-CCEE <WR>

[NOTE]

<DD> : 120V model only
<DT> : Asian model only for 120V
<GT> : Asian model only for 230V

<PP> : European model only
<WT> : World wide model only
<WR> : Chinese model only
<494> : TX-DS494 only
<490> : HT-R490 only

<B> : Black model only

<S> : Silver model only

<G> : Golden model only

CAUTON : Replacement of the transistor of mark * ,if necessary,
must be made from the same beta group(HFE) as the
original type.

NOTE: THE COMPONENTS IDENTIFIED BY MARK
ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH
PART NUMBER SPECIFIED.

*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*

EXPLODED VIEW PARTS LIST-2

TX-DS494/HT-R490

REF. NO. PART NO. DESCRIPTION

U18 1A899554-1A NAETC-7054-1A, Primary terminal PC board ass'y <DD>

1A899554-1B NAETC-7054-1B, Primary terminal PC board ass'y <PP>
1A899554-1C NAETC-7054-1C, Primary terminal PC board ass'y <PA>
1A899554-1D NAETC-7054-1D, Primary terminal PC board ass'y <WT>
1A899554-1F NAETC-7054-1F, Primary terminal PC board ass'y <490>
1A899554-1G NAETC-7054-1G, Primary terminal PC board ass'y <GT>
1A899554-1H NAETC-7054-1H, Primary terminal PC board ass'y <WR>

U19 1A899555-1A NAPS-7055-1A, Regulator circuit PC board ass'y <DD>

1A899555-1B NAPS-7055-1B, Regulator circuit PC board ass'y <PP>
1A899555-1C NAPS-7055-1C, Regulator circuit PC board ass'y <PA>
1A899555-1D NAPS-7055-1D, Regulator circuit PC board ass'y <WT>
1A899555-1F NAPS-7055-1F, Regulator circuit PC board ass'y <490>
1A899555-1G NAPS-7055-1G, Regulator circuit PC board ass'y <GT>
1A899555-1H NAPS-7055-1H, Regulator circuit PC board ass'y <WR>

U20 1A899556-1A NAETC-7056-1A, Video terminal PC board ass'y <DD>

1A899556-1B NAETC-7056-1B, Video terminal PC board ass'y <PP>
1A899556-1C NAETC-7056-1C, Video terminal PC board ass'y <PA>
1A899556-1D NAETC-7056-1D, Video terminal PC board ass'y <WT>
1A899556-1F NAETC-7056-1F, Video terminal PC board ass'y <490>
1A899556-1G NAETC-7056-1G, Video terminal PC board ass'y <GT>
1A899556-1H NAETC-7056-1H, Video terminal PC board ass'y <WR>

U21 1A899557-1A NAAF-7057-1A, Multi channel input terminal PC board ass'y <DD>

1A899557-1B NAAF-7057-1B, Multi channel input terminal PC board ass'y <PP>
1A899557-1C NAAF-7057-1C, Multi channel input terminal PC board ass'y <PA>
1A899557-1D NAAF-7057-1D, Multi channel input terminal PC board ass'y <WT>
1A899557-1F NAAF-7057-1F, Multi channel input terminal PC board ass'y <490>
1A899557-1G NAAF-7057-1G, Multi channel input terminal PC board ass'y <GT>
1A899557-1H NAAF-7057-1H,,Multi channel input terminal PC board ass'y <WR>

U23 240134 or TFCE1U114A or

240138A ENG06501QR <DD, 490>
240135 or TFCE1E512A or
240139A ENG07501Q <PP, WT, WR, PA, GT>

[NOTE]

<DD> : 120V model only
<DT> : Asian model only for 120V
<GT> : Asian model only for 230V

<PP> : European model only

<WT> : World wide model only

<WR> : Chinese model only

<494> : TX-DS494 only
<490> : HT-R490 only

<B> : Black model only

<S> : Silver model only

<G> : Golden model only

U11 1A899547-1A NAETC-7047-1A, Tone control PC board ass'y <DD>

1A899547-1B NAETC-7047-1B, Tone control PC board ass'y <PP>
1A899547-1C NAETC-7047-1C, Tone control PC board ass'y <PA,GT>
1A899547-1D NAETC-7047-1D, Tone control PC board ass'y <WT,WR>
1A899547-1F NAETC-7047-1F, Tone control PC board ass'y <490>

U12 1A899548-1A NAETC-7048-1A, Holder PC board ass'y <DD>

1A899548-1B NAETC-7048-1B, Holder PC board ass'y <PP>
1A899548-1C NAETC-7048-1C, Holder PC board ass'y <PA,GT>
1A899548-1D NAETC-7048-1D, Holder PC board ass'y <WT,WR>
1A899548-1F NAETC-7048-1F, Holder PC board ass'y <490>

U14 1A899550-1A NAAF-7050-1A, Input terminal PC board ass'y <DD>

1A899550-1B NAAF-7050-1B, Input terminal PC board ass'y <PP>
1A899550-1C NAAF-7050-1C, Input terminal PC board ass'y <PA>
1A899550-1D NAAF-7050-1D, Input terminal PC board ass'y <WT>
1A899550-1F NAAF-7050-1F, Input terminal PC board ass'y <490>
1A899550-1G NAAF-7050-1G, Input terminal PC board ass'y <GT>
1A899550-1H NAAF-7050-1H, Input terminal PC board ass'y <WR>

U15 1A899551-1A NAPS-7051-1A, Primary circuit PC board ass'y <DD>

1A899551-1B NAPS-7051-1B, Primary circuit PC board ass'y <PP>
1A899551-1C NAPS-7051-1C, Primary circuit PC board ass'y <PA>
1A899551-1D NAPS-7051-1D, Primary circuit PC board ass'y <WT>
1A899551-1F NAPS-7051-1F, Primary circuit PC board ass'y <490>
1A899551-1G NAPS-7051-1G, Primary circuit PC board ass'y <GT>
1A899551-1H NAPS-7051-1H, Primary circuit PC board ass'y <WR>

U16 1A899552-1A NASW-7052-1A, Power switch PC board ass'y <DD>

1A899552-1B NASW-7052-1B, Power switch PC board ass'y <PP>
1A899552-1C NASW-7052-1C, Power switch PC board ass'y <PA>
1A899552-1D NASW-7052-1D, Power switch PC board ass'y <WT>
1A899552-1F NASW-7052-1F, Power switch PC board ass'y <490>
1A899552-1G NASW-7052-1G, Power switch PC board ass'y <GT>
1A899552-1H NASW-7052-1H, Power switch PC board ass'y <WR>

U17 25137053 NCETC-7053 PC board for Holder

U13 1A899549-1A NADG-7049-1A, DSP circuit PC board ass'y <DD>

1A899549-1B NADG-7049-1B, DSP circuit PC board ass'y <PP, WR,WT, PA, GT>
1A899549-1C NADG-7049-1C, DSP circuit PC board ass'y <490>

REF. NO. PART NO.

DESCRIPTION

EXPLODED VIEW PARTS LIST-3

BLOCK DIAGRAM

U7

DISPLAY CIRCUIT
PC BOARD

U8

MAIN PC BOARD

U10

MASTER VOLUME PC BOARD

U21

MULTI CHANNEL INPUT
TERMINAL PC BOARD

U23

U13

DSP CIRCUIT PC BOARD

U20

VIDEO TERMINAL
PC BOARD

A

1

2

3

4

5

BCDEFG

X7001

5MHZ

X701

12.288MHZ

X702

12.2MHZ

AM

FM

U7201

TORX178B

Q201,203,204

BA7625

Q261

NJM4565M-D

Q243

NJM4558L-D

Q243

NJM4558L-D

Q241

NJM4558L-D

Q241

NJM4558L-D

Q302

NJM4565M-D

Q809

Q808

NJM4565M-D

Q803

NJM4565M-D

Q808

NJM4565M-D

Q3501

NJM4565M-D

Q3301

NJM4565M-D

Q3301

NJM4565M-D

Q302

NJM4565M-D

Q804

NJM4565M-D

Q701

Q704

Q703

OSC

TC7WU04

Q705,706,707

Q1001

BU1923

Q801

Q805

NJM4565M-D

Q809

Q807

NJM4565M-D

Q807

NJM4565M-D

Q806

NJM4565M-D

Q806

NJM4565M-D

Q805

NJM4565M-D

Q802

TC9162AF

Q3151

TC9164AF

Q202

Q221,Q222,Q223

Q3690,3691

1

1 1

Q934

78M05

G

IO

Q931

78M56

G

IO

Q709

MPC28M33HF

G

IO

Q7001

MPD780208GF

U7001

GP1U281X

Q7004

15-BT-70GNK

Q7201

74HCU04

13

12

Q7201

74HCU04

1

2

Q7201

74HCU04

9

8

DSP+5V

+24V

SWMUTE

AUDIO+12V
AUDIO-12V

FL-29V
FSWSLT
FSWSCK
FSWSDO

FSWSLT

FSWSDO

FSWSCK

CD

PHONO

FSWSLT

FSWSDO

FSWSCK

VIDEO SELECTOR

+5V

VCTLA

VCTLB

Mute

+6dB

+6dB

(TX-DS494 ONLY)

(TX-DS494 ONLY)

PHONO EQ

PHONO

CD

DIGITAL-1

DIGITAL-2

DIGITAL-3

LOCAL REGULATOR

NADG-7049

NAAR-7044

NAETC-7046

NADIS-7043

NAAF-7057

DIGITAL INPUT

MULTI CH INPUT

TU Mute

0dB

0dB

0dB

0dB

-3dB

-3dB

SURROUND MIX

MIC MIX

LFE MIX

0dB

+4.2dB

+4.2dB

+4.2dB

+6dB

0dB

0dB

0dB

+3.3V

+5V

MICON,FL

5.6V

VIDEO,TUNER

5V

+10.5dB

+6dB

+6dB

+6dB

+6dB

+6dB

-12dB

-12dB

INPUT SELECTOR

TC9273N-004

Q301

REC

REC

PLAY

PLAY

AK4526A

A/D

CONVERTER

2ch

MONITOR OUT

DVD

VIDEO-1

VIDEO-2

IN

RTADRH

AB/_INT

DIRCS

KARACS

DSPCS

CODECRST

SWMUTE

SDI

SDO

SCLK

FS96

ERROR

DIRPD

KARARST

DSPRST

BTADRL

KEY SW

FL TUBE

70kHz

70kHz

70kHz

70kHz

70kHz

700Hz

2Vrms

LFE

25kHz

CENTER MIX

MAIN BOARD

2Vrms

2Vrms

FL

2Vrms

FR

2Vrms

MIXED

MIXED

DIRECT

DIRECT

RDS signal

Control

TU-L/R

DSP

ROTARY ENCODER

VOLUME

DISPLAY

SW

C

R

L

RS

LS

RT

LT

SW Mute

SW Mute nearby SUBWOOFER PREOUT terminal.

SUBWOOFER

PREOUT

CONVERTER

D/A

6CH

AM FREQ STEP

REMOCON SENSOR

RDS DECODER

for MP TYPE

RI

MICROPROCESSOR

OUT

FM/AM
TUNER

TUNER UNIT

DSP

DSP

COAXIAL

COAXIAL

OPTICAL

AK4110

RECIEVER

INTERFACE

DIGITAL

FlashROM

2Mbit

CS4926

DSP

ANALOG IN/OUT

2Vrms

RS

2Vrms

C

2Vrms

LS

TAPE

DVD

VIDEO1

VIDEO2

MULTI-CH

BYPASS

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

BYPASS

U8

MAIN PC BOARD

U6

SECONDARY TERMINAL
PC BOARD

U9

HEAD PHONE JACK
PC BOARD

U4

SURROUND SPEAKER
TERMINAL PC BOARD

U2

SURROUND CHANNEL POWER
AMPLIFIER PC BOARD

U3

FRONT SPEAKER TERMINAL
PC BOARD

U1

FRONT CHANNEL
POWER AMPLIFIER
PC BOARD

U10

MASTER VOLUME PC BOARD

U14

INPUT TERMINAL PC BOARD

U20

VIDEO TERMINAL
PC BOARD

U19

REGULATOR CIRCUIT
PC BOARD

U18

PRIMARY TERMINAL
PC BOARD

U16

POWER SWITCH
PC BOARD

U15

PRIMARY CIRCUIT
PC BOARD

P401

P401

P402

Q932

X7001

5MHZ

Q3501

NJM4565M-D

Q3301

NJM4565M-D

Q3301

NJM4565M-D

Q3181,3183
NJM4565M-D

Q3181

NJM4565M-D

Q3281,3183
NJM4565M-D

Q3581

NJM4565M-D

Q3581

NJM4565M-D

Q3381

NJM4565M-D

Q3381

NJM4565M-D

Q3281

NJM4565M-D

Q3151

TC9164AF

Q405

Q406

Q3184

Q3284

Q3384

Q3484

Q3584

Q3684, Q3685

Q3182

Q3282

Q951

1

Q934
78M05

G

IO

Q931

78M56

G

IO

Q933

78M05

G

IO

Q921

78M12

G

IO

Q922

79M12

G

IO

Q7004

15-BT-70GNK

DSP+5V

+24V
AUDIO+12V
AUDIO-12V

FL-29V

HPIN

FSWSLT

FSWSDO

FSWSCK

I-PRO

V-PRO

SPARL

SPBRL

SPARL

SPARL

V-PRO

I-PRO

VOLSLT

SDO
SCK

GAINCTL

FMUTE

-29V REGULATOR

MW; AC120V and

AC220-230V

MG; AC220-230V

MP; AC230-240V

MD; AC120V

NAAF-7050

NAAF-6790

S-VIDEO SELECTOR

NAETC-7056

FOR TX-DS494 FOR HT-R490

MONITOR

V2 IN

V1 IN

DVD

VCTLA

VCTLB

BA7625

BA7625

+5V

NAAR-7044

NAETC-7047

NAETC-7045

(TX-DS494 ONLY)

HEAD PHONE JACK

NAPS-7051

NASW-7052

NAETC-7054

NAPS-7055

REGULATOR

NAETC-7046

NAETC-6795

NAAF-6789

NAETC-6791

NAETC-6792

/TONE

AF INPUT/VOLUME

+1dB/+11dB

+1dB/+11dB

+1dB

+1dB

+8.4dB

+8.4dB

+8.4dB

+27dB

+4.2dB

+4.2dB

+4.2dB

MICON,FL

5.6V

VIDEO,TUNER

5V

DSP

5V

AUDIO

-12V

+12V

Q3171

FL TUBE

PROTECT

MIXED

MIXED

DIRECT

DIRECT

SURROUND
SPEAKER

TONE VR

FRONT CH

SURROUND CH

FRONT SPEAKER

SUB PT

PT

PT

ROTARY ENCODER

VOLUME

AM FREQ STEP

RI

SP out 21Vrms Max (8ohm)

SP-B

SP-A

RL

SPEAKERS

CRS

LS

MULTI-CH

BYPASS

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

BYPASS

POWER

MWT only

POWER SW

AC IN

POWER RELAY

RI

AM FREQ STEP

MJ; AC100V

PROTECT

PROTECT

+29dB

+29dB

SPEAKERS

+29dB

+29dB

+29dB

TC9482N

-B

MAIN AMP

+B

POWER TRANS

FL AC

CENTER
SPEAKER

TX-DS494/HT-R490