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TX-DS797

Ref. No. 3714
102001
SERVICE MANUAL


AV RECEIVER
MODEL TX-DS797


DISPLAY DIMMER REC OUT ZONE 2 OFF
MASTER VOLUME

STANDBY/ON


SETUP
TUNI NG



ENTER

STANDBY


POWER RE TURN

PRESET

ON OFF

DIRECT STEREO SURROUND THX DSP FM MODE MEMORY A-FO RM LISTENING MODE MEMORY

UPSAMPLING
CLEAR




ZONE 2 ( GRN )
PHONES REC ( RED ) VIDEO 5/VIDEO CAM INPUT
AUDIO DVD VIDEO 1 VIDEO 2 VIDEO 3 VIDEO 4 VIDEO 5 TAPE FM AM PHONO CD
SELECTOR




VCR 1 VCR 2
DIGITAL S VIDEO VIDEO L AUDIO R


AV RECEIVER TX-DS797




Black, Golden and Silver models

BMDD 120V AC, 60Hz
BMPP,SMPP,BMPA,GMPA 230-240V AC, 50Hz
BMWT,GMWT,GMWR 120/220-230V AC, 50/60Hz
GMGT 220-230V AC, 50Hz


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.
TX-DS797

SPECIFICATIONS



AMPLIFIER SECTION TUNER SECTION
Continuous Average Power output (FTC) FM
All channels: 100 watts per channel min. RMS at Tuning Range: 87.5 -- 108.0 MHz (50 kHz steps)
8 ohms, 2 channels driven from 20 Usable Sensitivity
Hz to 20 kHz with no more than Mono: 11.2 dBf, 1.0 u V (75 ohms IHF)
0.08% total harmonic distortion. 0.9 uV (75 ohms DIN)
130 watts min. RMS at 6 ohms, 2 Stereo: 17.2 dBf, 2.0 u V (75 ohms IHF)
channels driven from 1 kHz with 23u V (75 ohms DIN)
no more than 0.1% total harmonic 50 dB Quieting Sensitivity
distortion. Mono: 17.2 dBf, 2.0uV (75 ohms)
Continuous Power output (DIN) 135 watts at 6 ohms Stereo: 37.2 dBf, 20uV (75 ohms)
Maximum Power output (EIAJ) 160 watts at 6 ohms Capture Ratio: 2.0 dB
Dynamic Power Output (Stereo) 2 x 250 watts at 3 ohms Image Rejection Ratio
2 x 210 watts at 4 ohms USA & Canadian models: 40 dB
2 x 130 watts at 8 ohms Other area models: 85 dB
Total Harmonic Distortion: 0.08% at rated power IF Rejection Ratio: 90 dB
0.08% at 1 Watt output Signal-to-Noise Ratio
IM Distortion: 0.08% at rated power Mono: 76 dB
0.08% at 1 Watt output Stereo: 70 dB
Damping Factor: 60 at 8 ohms Alternate Channel Attenuation: 55 dB
Input Sensitivity and Impedance Selectivity: 50 dB (DIN)
PHONO: 2.5 mV, 50 kohms AM Suppression Ratio: 50 dB
LINE (CD, TAPE, DVD, Total Harmonic Distortion
VIDEO 1-5): 200 mV, 50 kohms Mono: 0.2%
MULTICHANNEL INPUT Stereo: 0.3%
(FRONT L/C/R, SURROUND Frequency Response: 30 Hz -- 15 kHz, 1.0 dB
L/R, SURROUND BACK L/R): 200 mV, 50 kohms Stereo Separation: 45 dB at 1 kHz
(SUBWOOFER): 36 mV, 50 kohms 30 dB at 100 Hz 10 kHz
--
COAXIAL 1, 2, 3 (DIGITAL): 0.5 Vp-p, 75 ohms AM
DVD, VIDEO 1, 2, 3, 4, 5: 1 Vp-p, 75 ohms Tuning Range
1 Vp-p, 75 ohms (Y) USA & Canadian models: 530 to 1,710 kHz (10-kHz steps)
0.28 Vp-p, 75 ohms (C) European & Australian models: 522 to 1,611 kHz (9-kHz steps)
COMPONENT VIDEO 1, 2: 1 Vp-p, 75 ohms (Y) Worldwide models: 531 to 1,602 kHz (9-kHz steps)
0.7 Vp-p, 75 ohms (PB,PR) 530 to 1,710 kHz (10-kHz steps)
Output Level and Impedance Usable Sensitivity: 30 uV
Rec out (TAPE, VIDEO 1, 2): Image Rejection Ratio: 40 dB
200 mV, 470 ohms IF Rejection Ratio: 40 dB
Pre out: 1 V, 470 ohms Signal-to-Noise Ratio: 40 dB
ZONE 2 OUT: 100mV, 470 ohms Total Harmonic Distortion: 0.7%
VIDEO (VIDEO 1, 2, MONITOR
OUT, ZONE 2 OUT): 1 Vp-p, 75 ohms GENERAL
1 Vp-p, 75 ohms (Y) Power Supply
0.28 p-p, 75 ohms (C) USA & Canadian models: AC 120 V, 60 Hz
COMPONENT VIDEO OUT: 1 Vp-p, 75 ohms (Y) European & Australian models: AC 230-240 V, 50 Hz
0.7 Vp-p, 75 ohms (PB,PR) Some Asian models: AC 220-230 V, 50/60 Hz
Phono Overload: 120 mV RMS at 1 kHz, 0.5% T.H.D. Worldwide models: AC 220-230 and 120 V switchable,
Frequency Response: 10 Hz to 100 kHz : +1/-3 dB 50/60 Hz
(CD in Direct mode) Power Consumption
RIAA Deviation: 20 Hz to 20 kHz : 0.8 dB USA & Canadian models: 6.8 A
Tone Control Other models: 550 W
Bass: 10 dB at 50 Hz Dimensions (W x H xD): 435 x 175 x 459 mm
Treble: 10 dB at 20,000 Hz 17-1/8" x 6-7/8" x 18-1/16"
Signal-to-Noise Ratio (Stereo) Weight
Phono: 80 dB (IHF A, 5 mV input) USA & Canadian models: 35.9 lbs.
CD/Tape: 110 dB (IHF A, 0.5 V input) 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.
TX-DS797
A B C D
SERVICE PROCEDURES
1. Replacing the fuses 4. Memory Preservation
This unit does not require memory preserv ation batteries. A
This symbol located near the fuses indicates that the built-in memory power back-up system preserv es the contents
1 fuse used is fast operating type. For continued protection against of the memory during po wer f ailures and even when the unit is
fire hazard, replace with same type fuse. For fuse rating refer to unplugged. The unit must be plugged in order to char ge the
the marking adjacent to the symbol. back-up system.
The memory preserv ation period after the unit has been
Ce symbole indique que le fusible utlise est a rapide. unplugged v aries depending on climate and placement of the
Pour une protection permanente, n'untiliser que fusibles de unit. On the average, memory contents are protected over a
period of a fe w weeks after the last time the unit has been
meme type. Ce darnier est la qu le present symbol est
unplugged. This period is shorter when the unit is exposed to a
appse.
highly humid climate.

CIRCUIT NO. PART NO. DESCRIPTION 5.Setting the Voltage selector (Worldwide models
F901 252199 10A-UL/T-314,Fuse onl y)
F902 252077, 4A-SE-EAK,
252243 or 4A-SE-TL250V or Worldwide models are equipped with a voltage selector to conform with
2 local power supplies. Be sure to set this switch to match the voltage of
252277 4A-SE-TL250V,Fuse


the power supply in your area before plugging in the unit.
F903 252075, 2.5A-SE-EAK,
1. Determine the proper voltage for your area: 220-230 V or
252241 or 2.5A-SE-TL250V or 120 V.
252275 2.5A-SE-TL250V,Fuse

2. If the preset voltage is not correct for your area, insert a screw-
F9501,F9502 252160 or 2.5A-UL/T-237 or driver into the groo ve in the switch. Slide the switch all the w a y
252254 2.5A-T/UL-ST2,Fuse to the right (120 V) or to the left (220-230 V), which ever is
252075, 2.5A-SE-EAK, appropriate.
252241 or 2.5A-SE-TL250V or
252275 2.5A-SE-TL250V,Fuse


F9503,F9504 252158 or 1.6A-UL/T-237 or
252252 1.6A-T/UL-ST2,Fuse
3 252073 or 1.6A-SE-EAK or
252239 1.6A-SE-TL250V,Fuse



Note: :120V model only

: European model only
: Worldwide model only
: Asian model only for 230V
: 220V model only
: 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
4 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.
5 Connect the insulating-resistance tester between the plug of power
supply cord and screw on the back panel.
Specifications: 3.3Mohm·} 10% at 500V.
TX-DS797

A B C D E

WIRING VIEW 1
9-2 shows the number of schematic diagram.

NAETC-7272 RI 9-2 U35 NAAR-7267
P2805A P811A

terminal PC board P2705A Connector PC board
1 P2006A
U31 NAAF-7262 P5003E
JL931A
P2901B 9-3 Preamplifier circuit PC board
U39 P2505A
P3010A P4020A

P6832B P6830B 4-1,4-2
P2905A P3210A
P4610B
P6101A
P2901A P4610C


P5004E
P2906
P7705A
P2005A P3211A P3011A
U33 P3220A P4010A

NAAF-7264
Video terminal PC P3011B P3010B
P4020B P4010B P4011B
P4012A
board
P7703A
P3210B
3-1
U32 P4011A
P7704B
P3211B P7703B P7705B
NAAF-7263 P811B
2 Audio terminal PC
board
3-2
P9502 U1 NADG-7226
NAVD-7269 P1010A P7704A Main circuit PC board
S video circuit P2507B

PC board
8-1 2-1~2-4
P2705B U37 Front end

P2505B
U51 CN1
P4012A

P2506A
U38
NAVD-7270 9-1
Component video
terminal PC board
8-2 P7701A P7702


1-2
3 U36
P102A
U47 P2006B
NAVD-7268
P7201B


Composite video




P102B
U2501
NAETC-7278 P2007B

Front video PC circuit PC board U48
P5004A
P2704B board P2005B NADG-7228 1-2
Front video 2 PC board P5004B

P5004C

P7203 U23 NAPS-7252 P5004D
CNVSS
RXD1
CLK1

RTS1
TXD1
VDD


GND
RESET




P7201A Power supply circuit
PC board P6101

7-3
P5003A
NAETC-7332
Headphone terminal P5003B

PC board 1-1 U44
U21
P7559A




P5003C
P6401 JL6933A
NADIS-7330
U46




TX-DS797
P7482A
NAETC-7238 P6931 NAAF-7250
Display circuit PC board U45
Fan drive circuit 7-3 Power amplifier
4
P7559B




1-1,1-2 NASW-7331
P7482B




P7481 S7569
P7701B PC board PC board
Volume PC
P9503A
U12 6-1,6-2
board
1-2
TX-DS797

A B C D E

WIRING VIEW 2 9-2 shows the number of schematic diagram.
U9
NAETC-7239 7-2 NASW-7235
Thermal detector P917
Power switch PC board
circuit PC board NAETC-7236 P918A

NAETC-7272 Speaker terminal P6810D P6008A
U7 7-2 P917A

1 7-3 U13 RI terminal 9-2 F/C PC board U6 P6012A
P6830

JL6933B
JL931A
PC board P2901B
U10 7-1 P915
P918 NAAF-7232
JL931B
P6832B P6830B Power P6002A

U39 P901A
P916 amplifier
NAPS-7233 driver
U16 Primary circuit PC circuit PC P6011A



P911 board
board 1
P6401 NAETC-7242
NAETC-7238 7-3 P6001A

AC inlet terminal PC
P7701B
JL6933A Fan drive circuit
P6931 board
PC board
P6010A
U12 P9503A



P6101 P6000A
P6952 P6810A P6810B P6810C
5-2
P6080 P6081 P6082 P6931A
P6009
2 P6008




P5100A P6000 P6010 P6001 P6011 P5101A P6002 P6012
P5003A P5003B P5003C

P6812E P6008B U31
P5004A P5004B P5004C P5004D
Preamplifier
P5210A

P6832
P6013 P6003 P6014 P6004 P6015 P6016 P6006
P6101A P5004E P5003E circuit PC
P6083 P6084 P6085 P6086 board
6-1,6-2 NAAF-7262 4-1,4-2
NAETC-7237 P6812A
U21 P6812B P6812C P6812D

Speaker terminal
U11 7-1 NAAF-7250,Power amplifier driver PC board
SR/SB PC board P3220A

P6006A
U33
NAAF-7264
U22 Video terminal
FAN P6016A
3 JL6953B NAAF-7251
PC board
Power amplifier P3210B


U23 7-3 P6952A P9505A P6005A
driver PC
NAPS-7252 board 2 P3211B
3-1
P9501 P6015A
Power supply circuit PC board U8
5-1
7-2 U47
P9502A
P6951
JL9504A P9503 P6004A
JL6953A P2510 P2508




T901 P6014A 1-2 P3220B P2506B


U29 9-3
NAPS-7234 POWER NAETC-7227
JL9504B 7-3
U35 Rectifier circuit TRANS- Front video PC board
NAETC-7258 P6003A
NAAR-7267 PC board FORMER




TX-DS797
Thermal detector U37
Connector PC board NAVD-7269
4 circuit PC board P6013A
S video circuit PC 8-1
board
TX-DS797
A B C D E F G H
BLOCK DIAGRAM
DIGITAL AUDIO INPUT
OPTICAL 11dB
MULTICHANNEL INPUT
RX0
VIDEO 5 MUTE
SBR SBL SR SL SW C R L
(FRONT)
11dB
HEADPHONE

1
RX1 FLASH ROM FLASH ROM SRAM
COAXIAL 1 2ND PLL
MUTE
2M MIN. 2M MIN. 1M MIN.
DIGITAL AUDIO OUTPUT HPEN
RX2 MBM29LV002 MBM29LV002 MPD441000
COAXIAL 2
TC9246F
OPTICAL 1
RX3 24.576MHZ