Onkyo TXDS-494 Service Manual

STANDBY/ON

STANDBY

ABSPEAKERS

PHONES

POWER

TX-DS494/HT-R490

Ref. No.3676

052001

SERVICE MANUAL

AV RECEIVER

TX-DS494/HT-R490

SLEEP DIMMER DISPLAY

STANDBY/ON

INPUT SELECTOR

CD TAPE PHONO TUNER

DISPLAY

OFF

AUDIO

SELECTOR

DIGITAL

INPUT

SP SEL TUNING PRESET

SW MODE

VIDEO

DVD

VCR

LISTENING MODE

MEMORY

MODE

CLEAR

TAPE

DTS/

STEREO

DSP

SURROUND

DIMMER

PHONO

MASTER VOLUME

BASS

TREBLE

AV RECEIVER

TX-DS

494

DV D VIDEO 1 VIDEO 2

SUR MODE

SW MODE AUDIO SEL

TV CABLE SATELLITE

STANDBY/ON

DVD CD TAPE

CH TV VOL

DISC

TV/VCR

TOP MENU

ENTER

RETURN

TEST TONE

CH SEL

TUNER PRESET

MODE

VCR

MUTING

TV VOL

VOLUME

SETUP

LEVEL

TX-DS494 Black,Silver and Golden model

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

HT-R490 Black model

120V AC,60Hz

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.

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

SEPECIFICATIONS

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

AMPLIFIER SECTION

Continuous Average Power output (FTC)

All channels:

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): MULTICHANNEL INPUT

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

Output Level and Impedance

VIDEO (VIDEO 2, MONITOR): S VIDEO (MONITOR): 1 Vp-p, 75 ohms (Y)

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)

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.

200 mV, 50 kohms

1 Vp-p, 75 ohms (Y)

0.28 Vp-p, 75 ohms (C)

1 Vp-p, 75 ohms

0.28 Vp-p, 75 ohms (C)

TX-DS494/HT-R490

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

Tuning Range

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

European & Australian models:

Worldwide models: 531-1,602 kHz (9 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

Power Consumption: 3.4 A

Dimensions (W H D): 435 150 339 mm

Weight

North American models: 9.7 kg, 21.4 lbs.

European & Australian models:

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.

30 dB at 100 Hz-10 kHz

522-1,611 kHz (9 kHz steps)

530-1,710 kHz (10 kHz steps)

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

260 W

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

10.3 kg, 22.7 lbs.

[NOTES]

: TX-DS494 only

C7003

Q7001

R7010

R7017 R7018

R70

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

SERVICE PROCEDURES

TX-494/HT-R490

1. Replacing the fuses

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.

REF. NO. PART NO. DESCRIPTION

F911 F922

252166 6.3A-UL/T-237, Fuse <DD,WT,WR,490> 252077 or 4A-SE-EAK or 252243 4A-SE-TL250V, Fuse <PP,WT,WR,GT,PA>

F923

[NOTE]

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

<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

2. To initialize the unit

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.

5.Setting the AM tuning step frequency

(World wide 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.

AM FREQUENCY

STEP

10k Hz

9kHz

MONITOR

DVD

VIDEO 2

SUB

ANTENNA

OUT

TAPE

FM 75

DVD

VIDEO 1

GND

PHONO

VIDEO 2

VIDEO1

OUT

WOOFER PRE OUT

MONITOR OUT

OUT

VIDEO

DIGITALINPUT

OPTICAL

COAXIAL

FRONT

SURR

MULTI CHANNEL INPUT

SVIDEO

IN IN

CAUTION: SPEAKER IMPEDANCE

6 OHMS MIN. PER EACH

FRONTSPEAKERS

SPEAKER TERMINAL

AV RECEIVER

MODEL NO.

TX-DS494

AC 120/220-230V

RATING:

50/60Hz 260W

SUB

CENTER

WOOFER

REMOTE CONTROL

AM FREQUENCY

CENTER SPEAKER

STEP

10kHz 9kHz

VOLTAGE SELECTOR

220-230V

SURROUND SPEAKERS

AC OUTLETS

SWITCHED

TOTAL 100W MAX.

120V

6.Setting the voltage selector

(Worldwide models only)

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.

MONITOR

DVD

VIDEO 2

SUB

ANTENNA

OUT

TAPE

FM 75

DVD

VIDEO 1

GND

PHONO

VIDEO 2

VIDEO1

OUT

WOOFER PRE OUT

MONITOR OUT

OUT

VIDEO

DIGITALINPUT

OPTICAL

COAXIAL

FRONT

SURR

MULTI CHANNEL INPUT

SVIDEO

IN IN

CAUTION: SPEAKER IMPEDANCE

6 OHMS MIN. PER EACH

FRONTSPEAKERS

SPEAKER TERMINAL

AV RECEIVER

MODEL NO.

TX-DS494

AC 120/220-230V

RATING:

50/60Hz 260W

SUB

CENTER

WOOFER

REMOTE CONTROL

AM FREQUENCY

CENTER SPEAKER

STEP

10kHz

SURROUND SPEAKERS

AC OUTLETS

SWITCHED

VOLTAGE SELECTOR

220-230V

TOTAL 100W MAX.

120V

9kHz

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.

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

4. Memory Preservation

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.

VOLTAGE SELECTOR

220-230V

120V

7. Changing the AM band step

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

NADIS-7043 (Display circuit PC board)

From soldering side

Microprocessor

EXPLODED VIEW-1

MAIN PART

TX-DS494/HT-R490

P901

(PP,PT type)

P901

(DD type)

F933

U15

F911

F922

U18

E891

U12

T901

U19

U20

Q933

Q922

P101

U23

U21

D910

Q921

Q526

U14

U13

Q1513

E811

Q1512

Q518

E811

Q524

EXPLODED VIEW-2

FRONT PART

TX-DS494/HT-R490

P702

U16

P7001

U11

U17

U10

EXPLODED VIEW PARTS LIST-1

TX-DS494/HT-R490

REF. NO. PART NO. DESCRIPTION

1 27111200 Front bracket

2 27141787 Retainer, HP 3 838130088 4 82143010 3P+10FN(BC), Self tapping screw 6 27100368B Chassis 7 27190266 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 18 27141681 Retainer, PWB 20 27141735 Retainer, Rear 21 27141734 Retainer, Front 24 27160436A Heat sink S 25 82143010 26 29362772 Label, cover 27 27141729 Retainer, S 28 838430068 29 29110083 Tape, Cross-16U 32 27215357 Decorative frame

33 28325497A Knob, power

34 28191911 Clear plate

36 28184663-1 Top cover

37 28141408 Cushion 38 838430088

39 27175319A Leg 40 28141332 Cushion, leg 41 831430088 3TTW+8B(BC), Self tapping screw 42 28325641 Knob, Volume

43 28325405 Knob, tone

44 27191130 Holder, outlet <WR>

27111201 Front bracket <S> 27111202 Front bracket <G>

3TTB+8B, Self tapping screw

KGLS-12RF, Holder

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

3P+10FN(BC) Pan head screw

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

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

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

28191912 Clear plate <S,G>

28184666 Top cover <S> 28184682 Top cover <G>

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

838930088 3TTB+8B(UN), Self tapping screw <S, G>

28325642 Knob, Volume <S> 28325643 Knob, Volume <G>

28325474 Knob, tone <S> 28325407 Knob, tone <G>

REF. NO. PART NO. DESCRIPTION

45 27122810 Rear panel <DD>

46 87643010 47 838930088 3TTB+8B(UN), Self tapping screw 48 27212285 Front panel <DD, WT, WR, PA>

49 28198778 Facet 50 28135244 Badge

D910 22380038 or RBV602 or

E811 223024 Isolated sheet, AC238 E891 880048

F911 252166 6.3A-UL/T-237, Fuse <DD,WT,WR,490> F922 252077 or 4A-SE-EAK or

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

[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

: Black model only

<S> : Silver model only

<G> : Golden model only

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

W3*10F(BC), Flat washer

27212286 Front panel <PP> 27212287 Front panel <S> <PP> 27212288 Front panel <G> <PA, WR, WT, GT> 27212292 Front panel <490>

28135245 Badge <S,G>

22380274

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

RS603M, Diode

P-3055B-8L, Plastic rivet

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

P901 253279HIT AS-UC-2#18 or

Q523, Q524 , Q1512

Q623, Q624

Q525, Q526 , Q1513 Q625, Q626

Q517, Q518 2212654 or 2SC3421-Y or

Q921 222780125 78M12HF, IC Q922 222790125 79M12HF, IC Q933 222780055 78M05HF, IC

T901 2301438 NPT-1384D, Power transformer

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

[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

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>

2202253 or 2SC4467-O or 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 2202243 or 2SA1694-O or 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

2212653 2SC3421-O, Transistor

2301440 NPT-1384P, Power transformer

2301441 NPT-1384DG, Power transformer

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

<DD, 490>

<PP, PA>

<WT, WR, GT>

: Black model only

<S> : Silver model only

<G> : Golden model only

REF. NO. PART NO. DESCRIPTION

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>

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-3

TX-DS494/HT-R490

REF. NO. PART NO. DESCRIPTION

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>

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>

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 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>

REF. NO. PART NO.

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

: Black model only

<S> : Silver model only

<G> : Golden model only

DESCRIPTION

BLOCK DIAGRAM

VIDEO SELECTOR

MONITOR OUT

DVD

VIDEO-1

OUT

VIDEO-2

DIGITAL INPUT

(TX-DS494 ONLY)

DIGITAL-3

COAXIAL

DIGITAL-2

COAXIAL

DIGITAL-1

OPTICAL

MULTI CH INPUT

NAAF-7057

PHONO

(TX-DS494 ONLY)

TUNER UNIT

U23

U7201

TORX178B

PHONO EQ

FM/AM TUNER

Q221,Q222,Q223

74HCU04 13

0dB

RDS signal

Control

TU-L/R

Q7201

74HCU04

Q7201

74HCU04

Q241

NJM4558L-D

0dB

Q243

NJM4558L-D

0dB

U21

PHONO

Q261

NJM4565M-D

TU Mute

+5V

Q202

BA7625

+6dB

Q201,203,204

Mute

+6dB

Q701

DIGITAL

INTERFACE

RECIEVER

AK4110

Q241

NJM4558L-D

Q243

NJM4558L-D

MULTI CHANNEL INPUT TERMINAL PC BOARD

X701

12.288MHZ

Q809

25kHz

BCDEFG

DISPLAY

Q7004

Q7001

15-BT-70GNK

FL TUBE

MAIN BOARD

VIDEO,TUNER

AM FREQ STEP

X7001

5MHZ

5.6V

MICON,FL

BYPASS

MIXED

MULTI-CH

DIRECT

BYPASS

MIXED

MULTI-CH

DIRECT

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

AUDIO+12V AUDIO-12V

FL-29V

TC9164AF

DSP+5V

+24V

Q3151

VCTLA

VCTLB

SWMUTE

NADIS-7043

BTADRL

RTADRH

DSPRST

AB/_INT

DSP

Q705,706,707

2Mbit

FlashROM

Q704

DSP

CS4926

OSC

X702

Q703

TC7WU04

Q803

NJM4565M-D

Q804

NJM4565M-D

+5V

DSP

12.2MHZ

-12dB

LOCAL REGULATOR

Q709

1 1

MPC28M33HF

SW Mute

SW Mute nearby SUBWOOFER PREOUT terminal.

DIRPD

KARARST

Q801

AK4526A

6CH D/A

CONVERTER

2ch A/D

CONVERTER

+3.3V

DSP

DSPCS

CODECRST

Q3690,3691

DISPLAY CIRCUIT PC BOARD

SDO

+6dB

Q805

PREOUT

SDI

SCLK

Q807

NJM4565M-D

70kHz

+6dB

Q807

NJM4565M-D

70kHz

+6dB

Q806

NJM4565M-D

70kHz

Q806

NJM4565M-D

70kHz

Q805

NJM4565M-D

70kHz

LFE

2Vrms

FS96

ERROR

2Vrms

FR 2Vrms

LS 2Vrms

RS 2Vrms

C 2Vrms

Q809

+10.5dB

DIRCS

KARACS

NJM4565M-D

700Hz

+6dB

SUBWOOFER

DSP CIRCUIT PC BOARD

SWMUTE

REMOCON SENSOR

U7001

GP1U281X

RDS DECODER

Q1001

BU1923

for MP TYPE

Q802

TC9162AF

FSWSLT FSWSCK FSWSDO

MIC MIX

CENTER MIX

SURROUND MIX

LFE MIX

-3dB

U13

KEY SW

Q808

NJM4565M-D

2Vrms

Q808

NJM4565M-D

2Vrms

0dB

-3dB

NADG-7049

MPD780208GF

MICROPROCESSOR

ANALOG IN/OUT

REC

TAPE

VIDEO1

VIDEO2

PLAY

DVD

REC

PLAY

INPUT SELECTOR

Q301

TC9273N-004

FSWSLT

FSWSDO

FSWSCK

0dB

Q302

NJM4565M-D

0dB

Q302

NJM4565M-D

VIDEO TERMINAL PC BOARD

TX-DS494/HT-R490

VOLUME

AM FREQ STEP

NAETC-7046

U10

MASTER VOLUME PC BOARD

DSP+5V

+24V AUDIO+12V AUDIO-12V

FL-29V

Q934

78M05

5.6V

MICON,FL

BYPASS

MIXED

MULTI-CH

DIRECT

BYPASS

MIXED

MULTI-CH

DIRECT

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

DSP

MULTI-CH

Q931

78M56

Q3151

TC9164AF

MAIN PC BOARD

NJM4565M-D

NAAR-7044

U20

VIDEO TERMINAL PC BOARD

ROTARY ENCODER

FSWSLT

FSWSDO

FSWSCK

Q3301

+4.2dB

Q3301

+4.2dB

Q3501

+4.2dB

VCTLA

VCTLB

AF INPUT/VOLUME

VOLSLT

GAINCTL FMUTE

+5V

S-VIDEO SELECTOR

U19

REGULATOR CIRCUIT PC BOARD

NAETC-7047

Q3171

TC9482N

SDO SCK

NAETC-7056

Q405

Q406

REGULATOR

DSP

Q921

78M12

+12V

AUDIO

-12V

Q932

-29V REGULATOR

/TONE

+1dB/+11dB

Q3181

NJM4565M-D

Q3182

+1dB/+11dB

Q3281

NJM4565M-D

Q3282

Q3381

NJM4565M-D

+8.4dB

Q3381

NJM4565M-D

+8.4dB

Q3581

NJM4565M-D

+8.4dB

Q3581

NJM4565M-D

BA7625

NAPS-7055

Q933

78M05

Q922

79M12

TONE VR

Q3181,3183 NJM4565M-D

+1dB

Q3281,3183 NJM4565M-D

+1dB

Q3284

Q3384

Q3484

Q3584

+27dB

Q3684, Q3685

FOR TX-DS494 FOR HT-R490

P401

MONITOR

DVD

V1 IN

V2 IN

P402

Q3184

P401

NAAF-7050

SECONDARY TERMINAL PC BOARD

NAETC-6795

MAIN AMP

FL AC

-B

FRONT CH

NAAF-6789

PROTECT

V-PRO

+29dB

SURROUND CH

+29dB

MWT only

AM FREQ STEP

U14

INPUT TERMINAL PC BOARD

POWER TRANS

FRONT CHANNEL POWER AMPLIFIER PC BOARD

PROTECT

I-PRO

V-PRO

PROTECT

NAAF-6790

NAETC-7054

U18

SUB PT

POWER RELAY

I-PRO

POWER

PRIMARY TERMINAL PC BOARD

Q951

POWER SW

NAPS-7051

U15

PRIMARY CIRCUIT PC BOARD

HEAD PHONE JACK

(TX-DS494 ONLY)

HPIN

HEAD PHONE JACK

PC BOARD

FRONT SPEAKER

FRONT SPEAKER TERMINAL PC BOARD

SP out 21Vrms Max (8ohm)

SPARL

SPBRL

NAETC-6791

SPARL

NAETC-6792

SURROUND CHANNEL POWER

AMPLIFIER PC BOARD

CRS

CENTER SPEAKER

SURROUND SPEAKER TERMINAL PC BOARD

NASW-7052

U16

POWER SWITCH PC BOARD

AC IN

MD; AC120V MJ; AC100V

MG; AC220-230V

MP; AC230-240V

MW; AC120V and

AC220-230V

NAETC-7045

SPEAKERS

SP-A

SP-B

SPEAKERS

SURROUND SPEAKER

+ 23 hidden pages