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Pioneer A-90 - Service Manual

Pioneer A-90
42 pages
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Summary

Specifications

Front Panel Facilities and Controls

Power and Tone Controls

Includes power switch, bass/treble controls, and turnover frequency selection.

Audio Mode and Speaker Selection

Manages stereo/mono modes, speaker output, and headphone jack.

Input and Monitoring Controls

Selects input sources, tape monitoring, and copy functions.

Special Function Switches

Explains muting, line straight, subsonic filter, and balance operations.

Block Diagrams

Circuit Descriptions

Input Stage Circuits

Covers MC Head Amplifier and Equalizer Amplifier circuits.

Tone and Muting Circuits

Details Tone Control and Phono System Muting circuits.

Signal Path and Protection Circuits

Explains Line Straight, Power Amplifier, and Protector circuits.

Dynamic Power Supply Circuit

Describes the variable voltage power supply system.

Parts Location Diagrams

Front Panel Parts Location

Identifies parts on the front panel and view.

Internal Component Locations

Locates parts on top, bottom, and rear views.

Exploded Views and Parts Lists

Exterior Components Exploded View

Exploded view of external parts.

Front Panel Assembly Exploded View

Exploded view and parts list for the front panel.

PC Board Connection Diagrams

Schematic Diagrams

Component Identification

Electrical Parts List

General Parts Categories

Lists miscellaneous, PCB, switches, and other parts.

Regulator and Power Amp. (L) Assembly Parts

Lists parts for regulator and left power amp.

Control and Input Assemblies Parts

Lists parts for tone, muting, mode, headphone controls.

System Components and Output Assemblies Parts

Lists parts for function, terminals, tone, volume, protection, rectifier, output.

Power Amp. (R) and AF Assembly Parts

Lists parts for right power amp and AF assembly.

Adjustments

Idle Current Adjustment

Procedure to set idle current for optimal performance.

Safety Information

Safety Precautions

Essential checks for customer and technician safety.

Product Safety Notice

Information on critical safety-related components.

Packing Information

Summary

Specifications

Front Panel Facilities and Controls

Power and Tone Controls

Includes power switch, bass/treble controls, and turnover frequency selection.

Audio Mode and Speaker Selection

Manages stereo/mono modes, speaker output, and headphone jack.

Input and Monitoring Controls

Selects input sources, tape monitoring, and copy functions.

Special Function Switches

Explains muting, line straight, subsonic filter, and balance operations.

Block Diagrams

Circuit Descriptions

Input Stage Circuits

Covers MC Head Amplifier and Equalizer Amplifier circuits.

Tone and Muting Circuits

Details Tone Control and Phono System Muting circuits.

Signal Path and Protection Circuits

Explains Line Straight, Power Amplifier, and Protector circuits.

Dynamic Power Supply Circuit

Describes the variable voltage power supply system.

Parts Location Diagrams

Front Panel Parts Location

Identifies parts on the front panel and view.

Internal Component Locations

Locates parts on top, bottom, and rear views.

Exploded Views and Parts Lists

Exterior Components Exploded View

Exploded view of external parts.

Front Panel Assembly Exploded View

Exploded view and parts list for the front panel.

PC Board Connection Diagrams

Schematic Diagrams

Component Identification

Electrical Parts List

General Parts Categories

Lists miscellaneous, PCB, switches, and other parts.

Regulator and Power Amp. (L) Assembly Parts

Lists parts for regulator and left power amp.

Control and Input Assemblies Parts

Lists parts for tone, muting, mode, headphone controls.

System Components and Output Assemblies Parts

Lists parts for function, terminals, tone, volume, protection, rectifier, output.

Power Amp. (R) and AF Assembly Parts

Lists parts for right power amp and AF assembly.

Adjustments

Idle Current Adjustment

Procedure to set idle current for optimal performance.

Safety Information

Safety Precautions

Essential checks for customer and technician safety.

Product Safety Notice

Information on critical safety-related components.

Packing Information

Pioneer A-90 Specifications

General IconGeneral
TypeIntegrated Amplifier
Signal-to-Noise Ratio110dB (IHF-A)
Input Impedance47 kΩ
Input sensitivity150mV
Frequency Response5Hz-100kHz (+0dB, -3dB)
Total Harmonic Distortion (THD)0.005%
Dimensions420 x 177 x 464 mm (W x H x D)
Speaker load impedance4Ω-16Ω
Output Power100W + 100W (8Ω, 20Hz-20kHz, THD 0.05%)

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