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TX-DS797
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK
ON THE
SCHEMATIC DIAGRAMS 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
Black, Golden and Silver models
MODEL
TX-DS797
Ref. No. 3714
102001
BMDD
BMPP,SMPP,BMPA,GMPA
BMWT,GMWT,GMWR
GMGT
120V AC, 60Hz
230-240V AC, 50Hz
120/220-230V AC, 50/60Hz
220-230V AC, 50Hz
STANDBY/ON
OFF
ON
POWER
STANDBY
PHONES
MASTER VOLUME
FM
AM
PHONO
C D
TAPE
VIDEO
4
VIDEO
5
VIDEO
3
VIDEO
2
VIDEO
1
DVD
OFF
ZONE
2
REC OUT
DISPLAY
DIMMER
UPSAMPLING
AUDIO
SELECTOR
ZONE
2 (
)
GRN
REC (
)
RED
S VIDEO
AUDIO
VIDEO
L
R
DIGITAL
VCR
2
VCR
1
VIDEO
5/VIDEO CAM INPUT
AV RECEIVER
TX-DS
797
CLEAR
DSP
A-FO RM LISTENING MODE MEMORY
THX
SURROUND
DIRECT
STEREO
MEMORY
FM MODE
ENTER
RE TURN
SETUP
TUNI NG
PRESET


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TX-DS797
SPECIFICATIONS
100 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.
130 watts min. RMS at 6 ohms, 2
channels driven from 1 kHz with
no more than 0.1% total harmonic
distortion.
135 watts at 6 ohms
160 watts at 6 ohms
2 x 250 watts at 3 ohms
2 x 210 watts at 4 ohms
2 x 130 watts at 8 ohms
0.08% at rated power
0.08% at 1 Watt output
0.08% at rated power
0.08% at 1 Watt output
60 at 8 ohms
2.5 mV, 50 kohms
200 mV, 50 kohms
200 mV, 50 kohms
36 mV, 50 kohms
0.5 Vp-p, 75 ohms
1 Vp-p, 75 ohms
1 Vp-p, 75 ohms (Y)
0.28 Vp-p, 75 ohms (C)
1 Vp-p, 75 ohms (Y)
0.7 Vp-p, 75 ohms (PB,PR)
200 mV, 470 ohms
1 V, 470 ohms
100mV, 470 ohms
1 Vp-p, 75 ohms
1 Vp-p, 75 ohms (Y)
0.28 p-p, 75 ohms (C)
1 Vp-p, 75 ohms (Y)
0.7 Vp-p, 75 ohms (PB,PR)
120 mV RMS at 1 kHz, 0.5% T.H.D.
10 Hz to 100 kHz : +1/-3 dB
(CD in Direct mode)
20 Hz to 20 kHz : 0.8 dB
10 dB at 50 Hz
10 dB at 20,000 Hz
80 dB (IHF A, 5 mV input)
AMPLIFIER SECTION
Continuous Average Power output (FTC)
All channels:
Continuous Power output (DIN)
Maximum Power output (EIAJ)
Dynamic Power Output (Stereo)
Total Harmonic Distortion:
IM Distortion:
Damping Factor:
Input Sensitivity and Impedance
PHONO:
LINE (CD, TAPE, DVD,
VIDEO 1-5):
MULTICHANNEL INPUT
(FRONT L/C/R, SURROUND
L/R, SURROUND BACK L/R):
(SUBWOOFER):
COAXIAL 1, 2, 3 (DIGITAL):
DVD, VIDEO 1, 2, 3, 4, 5:
COMPONENT VIDEO 1, 2:
Output Level and Impedance
Rec out (TAPE, VIDEO 1, 2):
Pre out:
ZONE 2 OUT:
VIDEO (VIDEO 1, 2, MONITOR
OUT, ZONE 2 OUT):
COMPONENT VIDEO OUT:
Phono Overload:
Frequency Response:
RIAA Deviation:
Tone Control
Bass:
Treble:
Signal-to-Noise Ratio (Stereo)
Phono:
CD/Tape:
110 dB (IHF A, 0.5 V input)
TUNER SECTION
FM
Tuning Range:
87.5-- 108.0 MHz (50 kHz steps)
Usable Sensitivity
Mono:
11.2 dBf, 1.0u V (75 ohms IHF)
0.9 uV (75 ohms DIN)
Stereo:
17.2 dBf, 2.0 uV (75 ohms IHF)
23u V (75 ohms DIN)
50 dB Quieting Sensitivity
Mono:
17.2 dBf, 2.0uV (75 ohms)
Stereo:
37.2 dBf, 20uV (75 ohms)
Capture Ratio:
2.0 dB
Image Rejection Ratio
USA & Canadian models:
40 dB
Other area 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
USA & Canadian models:
530 to 1,710 kHz (10-kHz steps)
European & Australian models: 522 to 1,611 kHz (9-kHz steps)
Worldwide models:
531 to 1,602 kHz (9-kHz steps)
530 to 1,710 kHz (10-kHz steps)
Usable Sensitivity:
30 uV
Image Rejection Ratio:
40 dB
IF Rejection Ratio:
40 dB
Signal-to-Noise Ratio:
40 dB
Total Harmonic Distortion:
0.7%
GENERAL
Power Supply
USA & Canadian models:
AC 120 V, 60 Hz
European & Australian models: AC 230-240 V, 50 Hz
Some Asian models:
AC 220-230 V, 50/60 Hz
Worldwide models:
AC 220-230 and 120 V switchable,
50/60 Hz
Power Consumption
USA & Canadian models:
6.8 A
Other models:
550 W
Dimensions (W x H xD):
435 x175 x459 mm
17-1/8"x 6-7/8" x 18-1/16"
Weight
USA & Canadian models:
35.9 lbs.
Other models:
17.3 kg
REMOTE CONTROLLER
Transmitter:
Infrared
Signal range:
Approx. 16 ft., 5 meters
Power supply:
Two " AA " batteries (1.5 V x 2)
Specifications and features are subject to change without notice.


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TX-DS797
SERVICE PROCEDURES
1. Replacing the fuses
This symbol located near the fuses indicates that the
fuse used is fast operating type. For continued protection against
fire hazard, replace with same type fuse. For fuse rating refer to
the marking adjacent to the symbol.
Ce symbole indique que le fusible utlise est a rapide.
Pour une protection permanente, n'untiliser que fusibles de
meme type. Ce darnier est la qu le present symbol est
appse.
CIRCUIT NO.
PART NO.
DESCRIPTION
F901
252199
F902
252077,
252243 or
252277
F903
252075,
252241 or
252275
F9501,F9502
252160 or
252254
252075,
252241 or
252275
F9503,F9504
252158 or
252252
252073 or
252239
10A-UL/T-314,Fuse <D/WT/GT>
4A-SE-EAK,
4A-SE-TL250V or
4A-SE-TL250V,Fuse <P/WT/R/A/GT>
2.5A-SE-EAK,
2.5A-SE-TL250V or
2.5A-SE-TL250V,Fuse <P/WT/R/A/GT>
2.5A-UL/T-237 or
2.5A-T/UL-ST2,Fuse <D>
2.5A-SE-EAK,
2.5A-SE-TL250V or
2.5A-SE-TL250V,Fuse <P/WT/R/A/GT>
1.6A-UL/T-237 or
1.6A-T/UL-ST2,Fuse <D>
1.6A-SE-EAK or
1.6A-SE-TL250V,Fuse <P/WT/R/A/GT>
Note: <D>:120V model only
<P>: European model only
<WT>: Worldwide model only
<R>: Asian model only for 230V
<GT>: 220V model only
<A>: Australian model 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 source results in
accident which causes the specified operations and functions to
operate abnormally.
To perform a result, please follow the procedure below.
1.Press and hold down the VIDEO 1 button, then press the
STANDBY/ON button.
2.After "clear" is displayed, the preset memory and each
mode stored in the memory, such as surround, are
initialized and will return to the factory setting.
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 screw on the back panel.
Specifications: 3.3Mohm·} 10% at 500V.
4. Memory Preservation
This unit does not require memory preservation batteries. A
built-in memory power back-up system preserv es the contents
of the memory during po wer f ailures and even when the unit is
unplugged. The unit must be plugged in order to char ge the
back-up system.
The memory preserv ation period after the unit has been
unplugged v aries depending on climate and placement of the
unit. On the average, memory contents are protected over a
period of a fe w weeks after the last time the unit has been
unplugged. This period is shorter when the unit is exposed to a
highly humid climate.
Worldwide models are equipped with a voltage selector to 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.
1. Determine the proper voltage for your area: 220-230 V or
120 V.
2. If the preset voltage is not correct for your area, insert a screw-
driver into the groo ve in the switch. Slide the switch all the w a y
to the right (120 V) or to the left (220-230 V), which ever is
appropriate.
5.Setting the Voltage selector (Worldwide models
onl y)
A
1
2
3
4
5
B
C
D
E
F
G
H


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TX-DS797
WIRING VIEW 1
TX-DS797
U1
U47
U31
U23
U21
U38
U48
U36
U37
U45
U33
U12
U39
U32
U44
U35
U46
U51
P6101A
P4610C
P4610B
JL6933A
P7201B
P3010B
P3011B
P1010A
P3220A
P3210B
P3211B
P2007B
P2005B
P2006B
P2507B
P2505B
P2506A
P2705B
P2704B
P6830B
P6832B
P2901B
JL931A
P4020B
P4010B
P4011B
P4012A
P5004E
P5003E
P7704B
P7705B
P7703B
P7701A
P102A
P811B
P7702
P2901A
P2805A
P2705A
P2006A
P2005A
P2905A
P2505A
P3010A
P3011A
P7704A
P7705A
P7703A
P811A
P3210A
P3211A
P4020A
P4010A
P4011A
P4012A
P9502
P2906
P7701B
P6931
P9503A
P6401
P5004A
P5004B
P5004C
P5004D
P5003A
P5003B
P5003C
P6101
Front end
CN1
NAAF-7262
Preamplifier circuit PC board
4-1,4-2
NADG-7226
Main circuit PC board
NADG-7228
Front video 2 PC board
NAPS-7252
Power supply circuit
PC board
NAAF-7250
Power amplifier
PC board
NAETC-7238
Fan drive circuit
PC board
NASW-7331
Volume PC
board
NADIS-7330
Display circuit PC board
1-1,1-2
NAETC-7332
Headphone terminal
PC board
NAVD-7270
Component video
terminal PC board
NAETC-7278
Front video PC
board
NAVD-7269
S video circuit
PC board
NAVD-7268
Composite video
circuit PC board
NAAF-7263
Audio terminal PC
board
NAAF-7264
Video terminal PC
board
NAETC-7272 RI
terminal PC board
NAAR-7267
Connector PC board
1-1
1-2
2-1~2-4
3-2
3-1
9-2
9-3
8-1
1-2
9-1
8-2
6-1,6-2
7-3
7-3
1-2
P7203
P7201A
P7482A
P7559A
GND
TXD1
RTS1
VDD
CLK1
RXD1
CNVSS
RESET
S7569
P7559B
P7481
P7482B
U2501
P102B
9-2 shows the number of schematic diagram.
A
1
2
3
4
BCD
E


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TX-DS797
WIRING VIEW 2
TX-DS797
JL6933B
JL6933A
P3220A
P3210B
P3211B
P6830B
P6832B
P2901B
JL931A
P7701B
P6931
P9503A
P6401
P5004A
P5004B
P5004C
P5004D
P5003A
P5003B
P5003C
P6101
P6013
P6014
P6015
P6016
P6003
P6004
P6006
P6010
P6011
P6012
P6000
P6001
P6002
P6810A
P6810B
P6810C
P6008
P6812A
P6812B
P6812C
P6812D
P6952
P6931A
P6009
P5210A
P5100A
P5101A
P6082
P6081
P6080
P6083
P6084
P6085
P6086
P6013A
P6014A
P6015A
P6016A
P6003A
P6004A
P6005A
P6006A
P6010A
P6011A
P6012A
P6000A
P6001A
P6002A
P6952A
P9505A
P6951
JL6953B
P9501
JL6953A
JL9504A
P9502A
P9503
P6812E
P6008B
P6832
P6008A
P6810D
P6830
P917
P918
P916
P915
P901A
P911
JL931B
P917A
P918A
JL9504B
P5003E
P5004E
P6101A
T901
POWER
TRANS-
FORMER
FAN
NAETC-7258
Thermal detector
circuit PC board
NAAR-7267
Connector PC board
NAPS-7252
Power supply circuit PC board
NAETC-7237
Speaker terminal
SR/SB PC board
NAAF-7250,Power amplifier driver PC board
NAETC-7238
Fan drive circuit
PC board
NAETC-7239
Thermal detector
circuit PC board
NAETC-7272
RI terminal
PC board
NAETC-7236
Speaker terminal
F/C PC board
NAETC-7242
AC inlet terminal PC
board
NAPS-7233
Primary circuit PC
board
NASW-7235
Power switch PC board
NAAF-7232
Power
amplifier
driver
circuit PC
board 1
NAAF-7262
NAAF-7264
Video terminal
PC board
NAAF-7251
Power amplifier
driver PC
board 2
NAETC-7227
Front video PC board
NAVD-7269
S video circuit PC
board
Preamplifier
circuit PC
board
Rectifier circuit
PC board
NAPS-7234
U39
U7
U21
U47
U23
U8
U29
U35
U22
U16
U10
U12
U13
U9
U11
U37
U33
U6
U31
7-3
7-3
7-1
7-3
7-3
9-3
7-2
6-1,6-2
9-2
7-1
7-2
7-2
5-2
4-1,4-2
3-1
1-2
8-1
5-1
P2506B
P3220B
P2508
P2510
9-2 shows the number of schematic diagram.
A
1
2
3
4
BCD
E