Onkyo TX-20 Service Manual

Detailed specifications for the amplifier circuitry, including output power and distortion.

Specifications related to the tuner's performance, such as tuning range and sensitivity.

General specifications for the 120V version, covering power supply and dimensions.

General specifications for the 220V version, including power supply and dimensions.

Step-by-step instructions for replacing the front panel assembly.

Guidance on how to replace the top and side panels of the unit.

Procedures for replacing Light Emitting Diodes within the device.

Instructions for identifying and replacing AC and speaker fuses.

Troubleshooting tip for the touch-sensor circuit and tuning indicator.

A comprehensive list of parts identified in the exploded view diagram.

Explanation of the auto high blend and meter display operational circuits.

Detailed description of how the locked and tuned indicator circuits function.

Description of the muting circuit's operation in the 220V model.

Identifies component placement and lists parts for the 120V model.

Identifies component placement and lists parts for the 220V model.

Lists the necessary test equipment for performing alignments.

Outlines the general settings and conditions for successful alignment.

Step-by-step guide for aligning the FM front end section.

Procedures for aligning the AM radio frequency section.

Visual guide for correctly threading the dial cord for tuning.

List of parts for the touch-sensor PC board.

List of parts for the indicator PC board.

Detailed parts list for the AM/FM tuner PC board.

Parts list for the preamplifier and main amplifier PC board.

Parts list for the volume control PC board.

Detailed electrical schematic for the 120V model.

Detailed electrical schematic for the 220V model.

Parts list for the AM/FM tuner printed circuit board.

Parts list for the preamplifier and main amplifier printed circuit board.

Steps and parts needed for packing the 120V model.

Steps and parts needed for packing the 220V model.