Onkyo TX-7230 Service Manual

SERVICE
MANUAL
QUARTZ
SYNTHESIZED
|
TUNER
AMPLIFIER
MODEL
TX~7230
Silver and b:
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK Z\ ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RiSK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COMPO-
NENTS WITH ONKYO PARTS WHOSE PARTS
NUMBERS APPEAR AS SHOWN IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EX-
POSED PARTS ARE ACCEPTABLY INSULATED
FROM THE SUPPLY CIRCUIT BEFORE RETURN.
ING THE APPLIANCE TO THE CUSTOMER.
i
mocels
TABLE OF CONTENTS
Spectiications . 00 ce ee oe 2
Service procédures... 2s ee poe ee 3
Biock diagrani
Amplifier section. «2. ee eee 4
Power supply section. 2... 0. ee 4
Dynaznic bass ciretitusc0.. oo oe oe 4
Pune? section) oe ee 5
Exploded view. 2.22 ee ee 6
Paris list. 0 ee ee, Gy ees 7
Circuit description. oe ee oe 8
Adjustment procedures... 65. oe 13
Pcb view/list
Tuner section 2 0. ee ee ee, 15
Digital section. 6. ee bye ee 17
Aimplifier section... oe 21
Control section... ee ee 25
Senematic diagram
Jumer section 3. 2k eee oe 19
AMD, section 4. lee ee ee, 2.
Block diaprani of 1Co 0 ee, head
Packing View. 2. 0 See ee ee. 2

Onkyo TX-7230 Specifications

General

Amplifier Type	Stereo Receiver
Number of Channels	2
Frequency Response	10 Hz - 100 kHz (+1 dB, -3 dB)
Total Harmonic Distortion	0.08%
Damping factor	60
Input Sensitivity (Line)	150 mV
Input Sensitivity (MM)	2.5 mV
Signal-to-Noise Ratio (Line)	100 dB
Signal to noise ratio (Line)	100 dB
Speaker Impedance	4-16 ohms
Tuner Type	FM/AM
Weight	7.3 kg
Tuning range	FM, MW
Signal to noise ratio (MM)	80 dB
Speaker load impedance	4 - 16 ohms
FM Sensitivity	1.0 μV (IHF)

Summary

Safety Related Component Warning

Specifications

Amplifier Section

Details power output, distortion, frequency response, sensitivity, and tone controls.

Tuner Section

Details tuning range, sensitivity, quieting, capture ratio, selectivity, and stereo separation.

Service Procedures

Replacing Fuses

Instructions for replacing the fuses with correct ratings for fire hazard protection.

Replacing Lamps

Details on replacing the dial plate illumination lamp.

Display PC Board Removal

Step-by-step instructions for removing the display PC board assembly.

Memory Preservation

Explains the unit's memory back-up system and maintenance.

Amplifier Section Block Diagram

Power Supply Section

Diagram illustrating the power supply circuit with voltage outputs.

Dynamic Bass Expander

Diagram and explanation of the dynamic bass expander circuit.

Tuner Section Block Diagram

Exploded View

Parts List

Circuit Descriptions

Synthesizer and Controller Operation

Details the operation of the synthesizer and controller functions via pin descriptions.

Auto Hi-Blend Switch Circuit

Explains the auto hi-blend switch function within the Q103 FM IF system.

Auto Search Tuning Circuit

Describes the operation of auto search tuning for FM and AM reception.

FM/AM Switch Circuit

Explains the circuit that switches between FM and AM reception modes.

PLL Tuned Circuit

Details the Phase Locked Loop (PLL) tuned circuit operation for AM and FM.

Frequency Indicator Circuit

Explains the block diagram of the frequency indicator circuit.

Muting Circuit

Describes the operation of the muting circuit during various reception conditions.

Adjustment Procedures

FM Section Adjustments

Details adjustment procedures for FM RF, IF, VCO, Distortion, Separation, and Muting level.

AM Section Adjustments

Details adjustment procedures for AM SG output, tuned frequency, and modulation.

Printed Circuit Board Information

Tuner Circuit PC Board

Bottom side view and parts list for the tuner circuit PC board.

Other PC Board Parts Lists

Parts lists for equalizer, dynamic bass, switch, and source selector boards.

Component Lists

Lists of capacitors, resistors, coils, transformers, and filters.

Packing View