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Onkyo TX-904 Service Manual

Onkyo TX-904
54 pages
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Onkyo TX-904 Specifications

General IconGeneral
Amplifier TypeStereo Receiver
Tuning rangeFM, MW
Input sensitivity2.5mV (MM), 150mV (line)
Output150mV (line)
Tuner TypeDigital
Total harmonic distortion0.08%
Speaker load impedance4Ω to 16Ω

Summary

SAFETY-RELATED COMPONENT WARNING!!

SPECIFICATIONS

AMPLIFIER SECTION

Detailed specifications for the amplifier section of the unit.

TUNER SECTION

Detailed specifications for the tuner section of the unit.

VIDEO SECTION

Specifications related to the video input and output.

GENERAL

General specifications including power supply and dimensions.

EXPLODED VIEW - MODEL TX-906

PARTS LIST - MODEL TX-906

EXPLODED VIEW - MODEL TX-904

PARTS LIST - MODEL TX-904

BLOCK DIAGRAM - TUNER SECTION (120V MODEL)

BLOCK DIAGRAM - TUNER SECTION (OTHER MODELS)

BLOCK DIAGRAM - AMPLIFIER SECTION (MODEL TX-906)

BLOCK DIAGRAM - AMPLIFIER SECTION (MODEL TX-904)

MICROPROCESSOR DESCRIPTIONS

TERMINAL DESCRIPTIONS

IC BLOCK DIAGRAMS AND DESCRIPTIONS

LA1266 (FM IF and AM Radio System)

Block diagram and description of the LA1266 IC.

AN7470 (FM Stereo Decoder)

Block diagram and description of the AN7470 IC.

BA7625 (Video Selector Switch)

Block diagram and description of the BA7625 IC.

LM7001 (PLL Synthesizer and Controller)

Block diagram and description of the LM7001 IC.

LC7822N (Analogue switch)

Block diagram and description of the LC7822N IC.

LC7821N (Analogue switch)

Block diagram and description of the LC7821N IC.

LC7823N (Analogue switch)

Block diagram and description of the LC7823N IC.

LC7536 (Electro Volume)

Block diagram and description of the LC7536 IC.

µPC1298V (Power Amplifier Driver)

Block diagram and description of the µPC1298V IC.

NJM2175L (Dolby Pro Logic Decoder)

Block diagram and description of the NJM2175L IC.

M50198P (Digital Delay)

Block diagram and description of the M50198P IC.

µPD17103CX-531 (Remote Control Decoder)

Description of the µPD17103CX-531 IC.

μPD6345C (Extended IC)

Description of the μPD6345C IC.

BA6125 (Signal meter driver)

Description of the BA6125 IC.

TA7291S (Volume driver)

Description of the TA7291S IC.

SI-18751 (Power amplifier)

Description of the SI-18751 IC.

ADJUSTMENT PROCEDURES

Preparation

Steps and settings required before performing adjustments.

Amplifier Section Adjustment

Specific adjustment procedure for the amplifier section.

FM Section Adjustments

AM Section Adjustments

Adjustment procedures for the AM section.

Tuner Circuit Board Details

PRINTED CIRCUIT BOARD PARTS LIST - TX-906 Selector/Power Amp

PRINTED CIRCUIT BOARD PARTS LIST - TX-906 Tuner/Other Boards

PRINTED CIRCUIT BOARD PARTS LIST - TX-904 Selector/Power Amp

PRINTED CIRCUIT BOARD PARTS LIST - TX-904 Display/Volume/RI/mR

PRINTED CIRCUIT BOARD PARTS LIST - TX-904 Tuner Circuit

PRINTED CIRCUIT BOARD PARTS LIST - TX-904 Video/Sub Amp

SERVICE PROCEDURES

Replacing the Fuses

Instructions for safely replacing fuses with correct types.

Changing FM/AM Band Step

Procedure for changing FM/AM band step settings.

Memory Preservation

Information on the unit's memory back-up system.

Safety Check Out

Safety checks before releasing the unit to the customer.

Change of Voltage

Instructions for setting the voltage selector.

PACKING VIEW

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