ONKYO TX-DS494 Service Manual

Cover page of ONKYO TX-DS494 Service Manual

Service Manual for ONKYO TX-DS494, downloadable as a PDF file.

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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
AB
SPEAKERS
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
RC-444M
REMOTE
CONTROLLER
INPUT SELECTOR
SLEEP
DI MMER DISPLAY
CD
TAPE
PHONO
TUNER
D V D
VIDEO 1 VIDEO 2
SUR MODE SW MODE AUDIO SEL
TUNER
PRESE T
STANDBY/ ON
DISC
MUTING
DVD
CD
TAPE
VOLUME
TOP MENU
MENU
CH SEL
RETURN
SETUP
TEST TONE
LEVEL
ENTER
MODE
T V
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
background image
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
AB
SPEAKERS
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
RC-444M
REMOTE
CONTROLLER
INPUT SELECTOR
SLEEP
DI MMER DISPLAY
CD
TAPE
PHONO
TUNER
D V D
VIDEO 1 VIDEO 2
SUR MODE SW MODE AUDIO SEL
TUNER
PRESE T
STANDBY/ ON
DISC
MUTING
DVD
CD
TAPE
VOLUME
TOP MENU
MENU
CH SEL
RETURN
SETUP
TEST TONE
LEVEL
ENTER
MODE
T V
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
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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]
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TX-494/HT-R490
C7003
Q7
00
1
Q7
00
1
R7010
R7017
R7018
R7019
R7020
R7021
R7022
R7023 R7024
R7025
R7026
R7027
R7028
R7029
R7030
R7031
R7032
R7034
R7035
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
R
L
1
2
COAXIAL
CAUTION:
SPEAKER IMPEDANCE
6 OHMS MIN. PER EACH
SPEAKER TERMINAL
OUT
IN
A
B
R
L
FRONT SPEAKERS
R
L
R
L
IN
OUT
VIDEO
DIGITAL INPUT
MONITOR
OUT
S VIDEO
DVD VIDEO 1
VIDEO 2
PHONO
CD
SUB
WOOFER
PRE OUT
TAPE
DVD
VIDEO 2
VIDEO 1
R
L
OPTICAL
IN
IN
MULTI
CHANNEL INPUT
MONI-
TOR
OUT
GND
120V
VOLTAGE SELECTOR
220-230V
SWITCHED
TOTAL 100W MAX.
AC OUTLETS
AV RECEIVER
MODEL NO.
TX-DS494
RATING:
50 /60 Hz
260W
AC 120/220-230V
10k Hz
9k Hz
AM FREQUENCY
STEP
10k Hz
9k Hz
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
R
L
1
2
COAXIAL
CAUTION:
SPEAKER IMPEDANCE
6 OHMS MIN. PER EACH
SPEAKER TERMINAL
OUT
IN
A
B
R
L
FRONT SPEAKERS
R
L
R
L
IN
OUT
VIDEO
DIGITAL INPUT
MONITOR
OUT
S VIDEO
DVD VIDEO 1
VIDEO 2
PHONO
CD
SUB
WOOFER
PRE OUT
TAPE
DVD
VIDEO 2
VIDEO 1
R
L
OPTICAL
IN
IN
MULTI
CHANNEL INPUT
MONI-
TOR
OUT
GND
120V
VOLTAGE SELECTOR
220-230V
SWITCHED
TOTAL 100W MAX.
AC OUTLETS
AV RECEIVER
MODEL NO.
TX-DS494
RATING:
50 /60 Hz
260W
AC 120/220-230V
10k Hz
9k Hz
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
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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
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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

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