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Onkyo TX-NR900

Onkyo TX-NR900
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TX-NR900/E
SERVICE MANUAL
SERVICE MANUAL
Black, Silver and Golden models
Ref. No. 3755
112002
AV RECEIVER
MODEL
TX-NR900/E
BUDD,BUDC 120V AC, 60Hz
BUPP,BUPA,SUPP,GUPA 230~240V AC, 50Hz
BUWT,GUWT,GUWR 120/220~230V AC, 50/60Hz
GUGT 220V AC, 50Hz
PUSH TO OPEN
TX
-
NR900E
STANDBY/ON
STANDBY
DVD
ZONE
2
()
GRN
REC
()
RED
AUDIO
SELECTOR
PURE AUDIO UPSAMPLING
OFF
ON
POWER
MASTER VOLUME
TUNER
PHONO
NET AUDIOC
D
TAPE
VIDEO
3
VIDEO
5
VIDEO
4
VIDEO
2
VIDEO
1
VCR
2
VCR
1
DISPL
AY
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.
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Onkyo TX-NR900 Specifications

General IconGeneral
Channels7.1
Network ConnectivityEthernet, Wi-Fi
Room CalibrationAccuEQ
Component Video Inputs3
Component Video Outputs1
Digital Audio Inputs (Optical)2
Digital Audio Inputs (Coaxial)2
Analog Audio Inputs6
Input Sensitivity/Impedance200 mV / 47 kOhms
Video Inputs/Outputs (Composite)4 Inputs, 1 Output
Phono InputYes
HDMI Outputs2
Audio Formats SupportedDolby TrueHD, DTS-HD Master Audio
Video Formats Supported1080p, 4K
Streaming ServicesSpotify, Pandora, Tidal
THX CertifiedYes
Frequency Response10 Hz - 100 kHz
Multi-room OutputZone 2
Weight11.0 kg
Power Output130 W per channel (8 ohms)
Total Harmonic Distortion0.08% (1 kHz, 1 W)

Summary

ONKYO SERVICE MANUAL

AV RECEIVER MODEL TX-NR900 E

Identifies the specific AV receiver model covered by the manual.

SAFETY-RELATED COMPONENT WARNING!

Critical safety warning regarding components vital for fire/shock protection.

SPECIFICATIONS

AMPLIFIER SECTION

Details the technical specifications of the receiver's amplification circuitry.

TUNER SECTION

Lists the technical specifications for the FM and AM tuner performance.

GENERAL SPECIFICATIONS

Covers general specifications like power supply, consumption, dimensions, and weight.

SERVICE PROCEDURES

Replacing the Fuses

Procedure for replacing fuses, emphasizing correct type and rating for safety.

Initializing the Unit

Steps to reset the unit to factory settings, including memory initialization.

Safety-Check Out

Safety check procedure for U.S. models after service, focusing on insulation resistance.

Setting the Voltage Selector

Instructions for setting the correct voltage for worldwide models to match local power supplies.

EXPLODED VIEW

BLOCK DIAGRAM - DIGITAL AND AUDIO INPUTOUTPUT

BLOCK DIAGRAM - AMPLIFIER AND POWER SUPPLY

SCHEMATIC DIAGRAM 1-1: SUB-MICROPROCESSOR AND DISPLAY SECTIONS

SCHEMATIC DIAGRAM 1-2: SUB-MICROPROCESSOR AND DISPLAY SECTIONS

SCHEMATIC DIAGRAM 2-1: DSP AND MAIN MICROPROCESSOR SECTION

SCHEMATIC DIAGRAM 2-2: DSP AND MAIN MICROPROCESSOR SECTION

SCHEMATIC DIAGRAM 3-1: AUDIO INPUTOUTPUT

PRINTED CIRCUIT BOARD VIEWS - SIDE 1

U45 VOLUME PC BOARD (NAETC-7739)

Component and soldering layout for the volume control PC board.

U46 HEADPHONE TERMINAL PC BOARD (NAETC-7740)

Layout for the headphone terminal PC board, showing component and soldering sides.

U47 FRONT VIDEO PC BOARD (NAETC-7741)

Details the front video input PC board layout, including component and soldering views.

U48 FRONT OPTICAL INPUT PC BOARD (NAETC-7742)

Shows the layout for the front optical input PC board, component and soldering sides.

SCHEMATIC DIAGRAM 4-1: PRE-AMPLIFIER SECTION

SCHEMATIC DIAGRAM 4-2: PRE-AMPLIFIER SECTION

SCHEMATIC DIAGRAM 6-2: POWER AMPLIFIER SECTION

SCHEMATIC DIAGRAM 6-1: POWER AMPLIFIER SECTION

SCHEMATIC DIAGRAM 5-2: DRIVER CIRCUIT SECTION

SCHEMATIC DIAGRAM 5-1: DRIVER CIRCUIT SECTION

SCHEMATIC DIAGRAM 7: SPEAKER TERMINAL AND FAN DRIVE SECTIONS

SCHEMATIC DIAGRAM 8: POWER SUPPLY SECTION

SCHEMATIC DIAGRAM 9-1: MOTHER BOARD SECTION

SCHEMATIC DIAGRAM 9-2: MOTHER BOARD SECTION

SCHEMATIC DIAGRAM 10-1: NET-TUNE CIRCUIT SECTION

SCHEMATIC DIAGRAM 10-2: NET-TUNE CIRCUIT SECTION

SCHEMATIC DIAGRAM 11-1: VIDEO SECTION

SCHEMATIC DIAGRAM 11-2: VIDEO SECTION

SCHEMATIC DIAGRAM 12: COMPONENT VIDEO SECTION

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 12

Shows the component and soldering sides of the component video PC board.

WIRING VIEW 2-2

U31 PREAMPLIFIER PC BOARD (NAAF-7718)

Shows the wiring connections to the preamplifier PC board.

U16 AC INLET TERMINAL PC BOARD (NAETC-7700)

Wiring connections to the AC inlet terminal PC board.

U7 PRIMARY CIRCUIT PC BOARD (NAPS-7691)

Wiring connections to the primary circuit PC board.

WIRING VIEW 2-1

U6 FRONTCENTER CHANNELS DRIVER AMPLIFIER PC BOARD (NAAF-7690)

Wiring connections to the front/center channels driver amplifier board.

U21 POWER AMPLIFIER PC BOARD (NAAF-7706)

Wiring connections to the power amplifier PC board.

U22 SURROUND CHANNELS DRIVER AMPLIFIER PC BOARD (NAAF-7707)

Wiring connections to the surround channels driver amplifier board.

WIRING VIEW 1-2

U1 DSP CIRCUIT PC BOARD (NADG-7687)

Wiring connections to the DSP circuit PC board.

U31 PREAMPLIFIER PC BOARD (NAAF-7718)

Wiring connections to the preamplifier PC board.

U48 FRONT OPTICAL INPUT PC BOARD (NAETC-7742)

Wiring connections to the front optical input PC board.

WIRING VIEW 1-1

U35 MAIN CONNECTOR PC BOARD (NAAR-7728)

Wiring connections to the main connector PC board.

U33 VIDEO TERMINAL PC BOARD (NAAF-7720)

Wiring connections to the video terminal PC board.

U39 RS232 TERMINAL PC BOARD (NAETC-7733)

Wiring connections to the RS232 terminal PC board.

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 1

U45 VOLUME PC BOARD (NAETC-7739)

Component and soldering layout for the volume control PC board.

U46 HEADPHONE TERMINAL PC BOARD (NAETC-7740)

Layout for the headphone terminal PC board, showing component and soldering sides.

U47 FRONT VIDEO PC BOARD (NAETC-7741)

Details the front video input PC board layout, including component and soldering views.

U48 FRONT OPTICAL INPUT PC BOARD (NAETC-7742)

Shows the layout for the front optical input PC board, component and soldering sides.

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 2-2

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 2-1

PRINTED CIRCUIT BOARD VIEW 3-3

PRINTED CIRCUIT BOARD VIEW 3-2

PRINTED CIRCUIT BOARD VIEW 3-1

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 4-1

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 4-2

PRINTED CIRCUIT BOARD VIEW FROM COMPONENT SIDE 5-1

PRINTED CIRCUIT BOARD VIEW FROM COMPONENT SIDE 5-2

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 6-1

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 6-2

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 7-1

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 7-2

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 8-1

U10 FRONTCENTER CHANNELS SPEAKER TERMINAL PC BOARD (NAETC-7694)

Soldering side layout for the front/center speaker terminal PC board.

U11 SURROUND CHANNELS SPEAKER TERMINAL PC BOARD (NAETC-7695)

Soldering side layout for the surround speaker terminal PC board.

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 8-2

U12 FAN DRIVE CIRCUIT PC BOARD (NAETC-7696)

Soldering side layout for the fan drive circuit PC board.

U8 BIAS SELECTOR RELAY PC BOARD (NAPS-7692)

Soldering side layout for the bias selector relay PC board.

U13 THERMAL DETECTOR PC BOARD (NAETC-7697)

Soldering side layout for the thermal detector PC board.

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 9-1

PRINTED CIRCUIT BOARD VIEW FROM SOLDERING SIDE 9-2

U7 PRIMARY CIRCUIT PC BOARD (NAPS-7691)

Soldering side layout for the primary circuit PC board.

U9 POWER SWITCH PC BOARD (NASW-7693)

Soldering side layout for the power switch PC board.

PRINTED CIRCUIT BOARD VIEW 10-4

PRINTED CIRCUIT BOARD VIEW 10-3

PRINTED CIRCUIT BOARD VIEW 10-2

U35 MAIN CONNECTOR PC BOARD (NAAR-7728)

Component parts layout for the main connector PC board.

U39 RS232 TERMINAL PC BOARD (NAETC-7733)

Component parts layout for the RS232 terminal PC board.

PRINTED CIRCUIT BOARD VIEW 10-1

U35 MAIN CONNECTOR PC BOARD (NAAR-7728)

Component parts layout for the main connector PC board.

U39 RS232 TERMINAL PC BOARD (NAETC-7733)

Component parts layout for the RS232 terminal PC board.

PRINTED CIRCUIT BOARD VIEW FROM COMPONENT SIDE 11-2

PRINTED CIRCUIT BOARD VIEW FROM COMPONENT SIDE 11-1

ADJUSTMENT AND CONFIRMATION PROCEDURES 3

Test Mode

Instructions for entering and navigating the unit's test modes via FL tube display.

Confirmation of Voltage Sensor

Procedure to confirm voltage sensor readings and relay operation under specific test conditions.

ADJUSTMENT AND CONFIRMATION PROCEDURES 2

Confirmation of Current Detection Circuit

Confirms current detection by measuring output levels with different loads and checks relay behavior.

Confirmation of Fan

Tests fan operation speed under various input signal and resistor connection conditions.

ADJUSTMENT AND CONFIRMATION PROCEDURES 1

Idling Current Adjustment

Procedure to adjust idling current for front/center and surround channels using trimming resistors.

Confirmation of Protection Circuit

Verifies speaker relays turn ON after power-up and OFF when power is switched off.

Confirmation of DC Detection Circuit

Checks speaker relay behavior when DC voltage is applied to the MULTI-CH INPUT.

PRINTED CIRCUIT BOARD-PARTS LIST 1

PRINTED CIRCUIT BOARD-PARTS LIST 1 (Cont.)

PRINTED CIRCUIT BOARD-PARTS LIST 1 (Cont.)

PRINTED CIRCUIT BOARD-PARTS LIST 2

PRINTED CIRCUIT BOARD-PARTS LIST 2 (Cont.)

PRINTED CIRCUIT BOARD-PARTS LIST 2 (Cont.)

PRINTED CIRCUIT BOARD-PARTS LIST 3

PRINTED CIRCUIT BOARD-PARTS LIST 4

PRINTED CIRCUIT BOARD-PARTS LIST 5

PRINTED CIRCUIT BOARD-PARTS LIST 6

PRINTED CIRCUIT BOARD-PARTS LIST 7

PRINTED CIRCUIT BOARD-PARTS LIST 8

PRINTED CIRCUIT BOARD-PARTS LIST 9

PRINTED CIRCUIT BOARD-PARTS LIST 10

PRINTED CIRCUIT BOARD-PARTS LIST 11

PRINTED CIRCUIT BOARD-PARTS LIST 12

PACKING VIEW-PARTS LIST

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