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Table of Contents
TX-DS494/HT-R490
DISPLAY
STANDBY/ON
STANDBY
POWER
ON
OFF
SP SEL
SW MODE
DIGITAL INPUT
A
SPEAKERS
B
AUDIO
DVD
VIDEO
1
SELECTOR
PHONES
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
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.
SERVICE MANUAL
AV RECEIVER
/
DTS
STEREO
SURROUND
DSP
LISTENING MODE
FM MODE
MEMORY
TUNING
PRESET
CLEAR
VIDEO
2
TAPE
FM
AM
PHONO
C D
VCR
120V AC, 60Hz
230-240V AC, 50Hz
120/220-230V AC, 50/60Hz
220-230V AC 50/60Hz
TX-DS494/HT-R490
STANDBY/ ON
MASTER VOLUME
SUR MODE SW MODE AUDIO SEL
STANDBY/ ON
DIMMER
TV/ VCR
TOP MENU
TEST TONE
BASS
TREBLE
TX-DS
494
AV RECEIVER
ON THE
Ref. No.3676
052001
SLEEP
DIMMER DISPLAY
INPUT SELECTOR
CD
TAPE
PHONO
TUNER
D V D
VIDEO 1 VIDEO 2
TUNER
PRESE T
MODE
TV
CABLE SATELLITE
VCR
DVD
CD
TAPE
CH
T V VOL
CH
DISC
MUTING
T V VOL
MENU
E N T E R
VOLUME
RETURN
SETUP
CH SEL
LEVEL
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Table of Contents
Related Manuals for Onkyo TX-DS494
Summary of Contents for Onkyo TX-DS494
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Page 1: Service Manual
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... - Page 2 17.2 dBf, 2.0 µV (75 ohms) Power supply and voltage vary depending on the area in which the unit is 50 dB Quieting Sensitivity purchased. Mono: 17.2 dBf, 2.0 µV (75 ohms) Stereo: 37.2 dBf, 2.0 µV (75 ohms) [NOTES] : TX-DS494 only...
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Page 3: Service Procedures
6 OHMS MIN. PER EACH SPEAKER TERMINAL AC OUTLETS COAXIAL SWITCHED TOTAL 100W MAX. FRONT AV RECEIVER AM FREQUENCY F911 VIDEO 1 MODEL NO. TX-DS494 STEP 252166 6.3A-UL/T-237, Fuse <DD,WT,WR,490> RATING: AC 120/220-230V 10k Hz 50 /60 Hz 260W 9k Hz SURR VOLTAGE SELECTOR... -
Page 4: Exploded View
TX-DS494/HT-R490 EXPLODED VIEW-1 MAIN PART P101 P901 P901 (PP,PT type) (DD type) E891 Q933 F922 F911 D910 Q922 F933 Q921 Q526 T901 Q524 E811 Q518 E811 Q1513 Q1512... - Page 5 TX-DS494/HT-R490 EXPLODED VIEW-2 FRONT PART P702 P7001...
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Page 6: Exploded View Parts List
<PP> : European model only 27175319A <WT> : World wide model only 28141332 Cushion, leg <WR> : Chinese model only <494> : TX-DS494 only 831430088 3TTW+8B(BC), Self tapping screw 28325641 Knob, Volume <B> <490> : HT-R490 only <B> : Black model only 28325642 Knob, Volume <S>... - Page 7 NOTE: THE COMPONENTS IDENTIFIED BY MARK <PP> : European model only ARE CRITICAL FOR RISK OF FIRE AND <WT> : World wide model only ELECTRIC SHOCK. REPLACE ONLY WITH <WR> : Chinese model only PART NUMBER SPECIFIED. <494> : TX-DS494 only <490> : HT-R490 only...
- Page 8 1A899551-1G NAPS-7051-1G, Primary circuit PC board ass'y <GT> <WR> : Chinese model only 1A899551-1H NAPS-7051-1H, Primary circuit PC board ass'y <WR> <494> : TX-DS494 only 1A899552-1A NASW-7052-1A, Power switch PC board ass'y <DD> <490> : HT-R490 only 1A899552-1B NASW-7052-1B, Power switch PC board ass'y <PP>...
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Page 9: Block Diagram
TC9162AF Q809 FSWSLT Q807 Q705,706,707 FSWSCK 2Mbit NJM4565M-D FSWSDO 25kHz VIDEO,TUNER DIGITAL INPUT FlashROM Q801 70kHz Q808 2Vrms AK4526A NJM4565M-D (TX-DS494 ONLY) +6dB Q7201 Q704 DIGITAL-3 5.6V 2Vrms CS4926 COAXIAL CONVERTER 74HCU04 MICON,FL Q807 Q7201 Q701 NJM4565M-D DIGITAL-2 DIGITAL COAXIAL... - Page 10 SPEAKERS NJM4565M-D MULTI-CH +27dB VOLSLT Q3684, Q3685 PROTECT SURROUND CENTER SPEAKER SPEAKER GAINCTL MAIN PC BOARD FOR TX-DS494 FOR HT-R490 FMUTE P401 NAETC-6792 P401 NAAR-7044 NAETC-7056 SURROUND SPEAKER MWT only MONITOR TERMINAL PC BOARD Q405 AM FREQ STEP SURROUND CHANNEL POWER...
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Page 11: Control Switch
Q3171 SWITCH Q704 Q701 TC9482N CS4926 AK4110 TUNER MASTER VOLUME UNIT 36 6 7 28 27 26 S7113 : TX-DS494 only CONTROL SWITCH Europian Q710 Q1001 model only Q301 K3 S7131 S7132 S7133 S7134 S7135 ------ ------ ------ BU1923 INVERTER... - Page 12 TX-DS494/HT-R490 MICROPROCESSOR TERMINAL DESCRIPTIUON Q7001: MPD78P0208GF Function Description Function Description Power supply terminal. (+5V) RDSSCK Clock input terminal from RDS decoder. STBY/RECV STANDBY/RECEIVED inductor control output terminal. REMIN Signal input terminal from remote sensor. FSWSDO Data output terminal to function switch ICs.
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Page 13: Schematic Diagram
SCHEMATIC DIAGRAM-1 to NAAR-7044 (PART-5) P305 NAAF-7050 INPUT TERMINAL PC BOARD R3371 R3571 220K 220K R3171 220K C3194 C319 R3181 47/16 47/1 R3187 Q3181 NJM4565M-D R3185 TC9482N Q3171 C3184 101J GAINCTL Q3182 DGND R3174 220 R3173 220 RN1241 R3175 220 VOLSLT 220K C3294... -
Page 14: Bass Treble
TX-DS494/HT-R490 BASS TREBLE 100K 100K C3195 C391 R393 47/16 LMIN 153J NJM4565M-D LMAX C3188 R3188 R391 R392 Q3184 Q3181 3.3K RMIN RN1241 47/16 C392 R394 RMAX C3187 C3190 R3196 153J 10/16 1.2K 101J 100K 100K Q3183 C3189 153J TONE CONTROL... - Page 15 SCHEMATIC DIAGRAM-2 C733 104Z NADG-7049 DSP CIRCUIT PC BOARD TC7WU04F Q703 R736 R735 1M R734 X702 C740 CSTCV12.2MTJ0C4 SDTO 100/6.3 L701 022M C701 100/6.3 L720 3.3VDSP L702 022M C702 022M 104Z CDTO DVDD MCKS/CDTO 28 R714 330 DSPSDO 3.3V DVSS CLKM/CDTI 27 C703 104Z R715 330...
- Page 16 TX-DS494/HT-R490 TX-DS494 HT-R490 R710 SDTO C714 104Z C751 C752 101J 101J EXTMEM EXTMEM C759 104Z L722 022M +5VDSP C755 104Z OE 32 C763 L720 101J A10 31 CE 30 022M DQ7 29 C753 C754 R771 DQ6 28 BTADRH 104Z 104Z...
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Page 17: Main P.c.board
SCHEMATIC DIAGRAM-3 TO TUNER UNIT P101A NAAR-7044 MAIN PC BOARD TX-DS494 ONLY C261,262 C263,264 C271,272 D,J type:NONE D,J type:101J D,J type:101J PHONO EQ P,W type:101J P,W type:471J P,W type:152K C267 10/16 NJM4565M-D C277 R265 KTC3199 Q261 C228 Q225 47/16 223Z... - Page 18 TX-DS494/HT-R490 TO NADIS-7043 TO NAAF-7050 P7001B P306A Q921 78M12 Q933 79M12 Q922 78M05 C926 C925 C942 C940 REGULATOR CIRCUIT 104Z 10/16 R929 104Z 10/16 PC BOARD R926 33 (1W) NAPS-7055 5.6 (1W) JL931B JL921B TO NAAR-7044 TO NAAF-7050 R922 P304A...
- Page 19 SCHEMATIC DIAGRAM-4 SURROUND SPEAKER TERMINAL PC BOARD NAETC-679 NAAF-6790 P603 SURROUND CHANNEL POWER AMPLIFIER SURROUND SPEAKERS PC BOARD S.L. S.R. Surround Lch. C625,C626,C1526 D,J type : NONE R659 P,W type : 103J 2.2 (1/2W) C641,C642,C1535 D,J type : NONE 43.1V 43.2V P,W type : 102J P602...
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Page 20: Power Switch Pc Board
TX-DS494/HT-R490 FRONT CHANNEL POWER AMPLIFIER PC BOARD TO NAAR-7044 NAETC-6792 NAAF-6789 P520A +24V RL501 RL502 Front Lch. ,C1526 RL502 R591 NONE (1/4W) : 103J C533 C534 103J P502 103J ,C1535 NONE 43.1V 43.2V : 102J 42.5V Q583 42.6V Q523 2SA992... - Page 21 2.2/50 C431 C432 Q402 BA7625 Q7001 V2 IN 2.2/50 MPD780208GF-095-3BA R432 MPD78P0208GF(TX-DS49 Q404 2SA1162-GR OR2KTA1054-GR TX-DS494 ONLY * TX-DS494 P401 2P * HT-R490 P401 3P MWT/MWR MGT/MPA HT-R490 R7018 R7019 R7020 3.3K R7073 R7021 2.2K 3.3K 8.2K R7075 R7158 000J...
- Page 22 GAINCTL 47 CODECPD CODECPD 48 R7046 1K DIRPD 49 DIRPD R7048 1K DIRCS R7050 1K DIRCS HP-R JL7003A R7053 10K R7151 TX-DS494 ONLY R7055 10K HEAD PHONE POWER JACK PC BOARD R7052 BTADRL VCTLB BTADRH P7002 VCTLA R7054 R7070 1K JL7003B...
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Page 23: Printed Circuit Board Parts List
TX-DS494/HT-R490 PRINTED CIRCUIT BOARD PARTS LIST-1 <494>: TX-DS494 only NOTE: <DD> : 120V model only NOTE:THE COMPONENTS IDENTIFIED BY MARK <DT> : Asian model only for 120V <490>: HT-R490 only CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. <GT> : Asian model only for 230V REPLACE ONLY WITH P ART NUMBER SPECIFIED. - Page 24 TX-DS494/HT-R490 PRINTED CIRCUIT BOARD PARTS LIST-2 <494>: TX-DS494 only NOTE: <DD> : 120V model only <490>: HT-R490 only <DT> : Asian model only for 120V NOTE:THE COMPONENTS IDENTIFIED BY MARK <GT> : Asian model only for 230V CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
- Page 25 TX-DS494/HT-R490 PRINTED CIRCUIT BOARD PARTS LIST-3 <494>: TX-DS494 only NOTE: <DD> : 120V model only <DT> : Asian model only for 120V <490>: HT-R490 only NOTE:THE COMPONENTS IDENTIFIED BY MARK <GT> : Asian model only for 230V CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
- Page 26 TX-DS494/HT-R490 PRINTED CIRCUIT BOARD PARTS LIST-4 <494>: TX-DS494 only NOTE: <DD> : 120V model only NOTE:THE COMPONENTS IDENTIFIED BY MARK <490>: HT-R490 only <DT> : Asian model only for 120V CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. <GT> : Asian model only for 230V REPLACE ONLY WITH P ART NUMBER SPECIFIED.
- Page 27 TX-DS494/HT-R490 PRINTED CIRCUIT BOARD PARTS LIST-5 <494>: TX-DS494 only NOTE: <DD> : 120V model only <490>: HT-R490 only <DT> : Asian model only for 120V NOTE:THE COMPONENTS IDENTIFIED BY MARK <GT> : Asian model only for 230V CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
- Page 28 TX-DS494/HT-R490 PRINTED CIRCUIT BOARD PARTS LIST-6 <494>: TX-DS494 only NOTE: <DD> : 120V model only <490>: HT-R490 only <DT> : Asian model only for 120V NOTE:THE COMPONENTS IDENTIFIED BY MARK <GT> : Asian model only for 230V CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
- Page 29 TX-DS494/HT-R490 FL TUBE VIEW Q7004: 15-BT-80GNK [15G-1G] –––– –––– –––– –––– –––– –––– –––– –––– –––– –––– –––– –––– –––– ––––...
- Page 30 TX-DS494/HT-R490 ADJUSTMENT PROCEDURES IDLING CURRENT ADJUSTMENT 1. Before Idling adjustment, turn the trimming resistors R573, R574, R673, R674 and R1532 to counter clockwise. 2. Connect the DC voltmeter to sockets P511,P512, P611, P612 and P1511. 3. After turn POWER to ON, adjust the trimming resistors R573, R574, R673, R674 and R1532 so that the reading of voltmeter becomes 2.4 to 2.6 mV.
- Page 31 TX-DS494/HT-R490 CONFIRMATION CONFIRMATION OF PROTECTION CIRCUIT 1. Confirmation of speaker relay Confirm that the speaker relay turns ON approximate 5 seconds after the power switch is turned ON. Confirm that the speaker relay turns OFF immediately after the power switch is turned OFF.
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Page 32: Packing View
<WT> : World wide model only 29343046 Instruction manual E <490> <WR> : Chinese model only 29343038 Instruction manual DIG-E <DD> <494> : TX-DS494 only 29343047 Instruction manual DIG-E <490> <490> : HT-R490 only 29343039 Instruction manual U3GDSw <PP> <B>... - Page 33 Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN Tel: 072-831-8111 Fax: 072-833-5222 ONKYO U.S.A. CORPORATION 18 Park Way, Upper Saddle River, N.J. 07458, U.S.A. Tel: 201-785-2600 Fax: 201-785-2650 E-mail: onkyo@onkyousa.com ONKYO EUROPE ELECTRONICS GmbH Industriestrasse 20, 82110 Germering, GERMANY Tel: 089-849-320 Fax: 089-849-3265 E-mail: info@onkyo.de...