Pioneer A-09 Service Manual

@) PIONEER’
The Art of Entertainment
Service
Manual
STEREO AMPLIFIER
A-09
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
ORDER NO.
ARP2858
CONTENTS
1. EXPLODED VIEWS, PACKING AND PARTS LIST -:: 2
2. SCHEMATIC AND PCB CONNECTION DIAGRAMS::: 8
3. PCB PARTS LIST cccccsreerecceeee eee seeceseeeeeeaeerneeressea 51
4. BLOCK DIAGRAM cereccccrcccerettettteerreeneteeeeeenennneres 55
5. CIRCUIT DISCRIPTION coreeceeccecresteeeeteceesteeeeeeereees 56
6. ADJUSTMENTS ccccccecerreeecceeeceeerereeceeeeeeenteesseanen 57
7. PANEL FACILITIES rerrretecrcereteeteecceccecereteeteenseanes 58
8. SPECIFICATIONS ccccececcececcreeeeceseeeeeeeeeeeeensaneeeene 60
PIONEER ELECTRONIC CORPORATION 2-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE INC. P.O. Box 1760, Long Beach, California 90801 U.S.A.
PIONEER ELECTRONICS OF CANADA, INC. 300 Allstate Parkway Markham, Ontario L3R OP2 Canada
PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia TEL: [03] 580-9911
© PIONEER ELECTRONIC CORPORATION 1994 SEE ee eeerna ree

Pioneer A-09 Specifications

General

Input Impedance	47 kΩ
Output Power	100 W per channel (8 ohms)
Frequency Response	5 Hz - 100 kHz
Dimensions	440 x 162 x 479 mm
Weight	30 kg
Speaker load impedance	4 ohms - 16 ohms

Summary

EXPLODED VIEWS, PACKING AND PARTS LIST

PARTS LIST

Detailed list of all components by mark number and part number.

PACKING

Illustration of the unit's packaging for shipping.

EXPLODED VIEWS

Detailed visual breakdowns showing assembly of the unit's components.

SCHEMATIC AND PCB CONNECTION DIAGRAMS

OVERALL SCHEMATIC DIAGRAM

Complete circuit diagram illustrating the amplifier's signal flow and connections.

INPUT ASSEMBLY

PCB layout and connection details for the audio input stages.

PHONO BALANCE ASSEMBLY

PCB layout and connection details for the phono equalization and balance circuits.

FUNCTION SW, LED AND REC SEL. SW ASSEMBLIES

PCB layouts for front panel controls: function, LED indicators, and recording selector.

VOLTAGE AMP ASSEMBLY

PCB layout and connection details for the voltage amplification stages.

POWER R I/O, POWER R NPN AND POWER R PNP ASSEMBLIES

PCB layouts and connections for the right channel power output stages.

PROTECTION, DIODE 1 AND DIODE 2 ASSEMBLIES

PCB layouts for the protection, diode 1, and diode 2 circuits.

PCB PARTS LIST

LIST OF ASSEMBLIES

Lists major sub-assemblies and their corresponding part numbers.

SEMICONDUCTORS

Lists semiconductor components like transistors and ICs with their part numbers.

CAPACITORS

Lists capacitor components and their respective part numbers.

RESISTORS

Lists resistor components and their respective part numbers.

COILS AND FILTERS

Lists coil and filter components with their part numbers.

SWITCHES AND RELAYS

Lists switches and relays with their part numbers.

OTHERS

Lists miscellaneous parts such as connectors and screws.

BLOCK DIAGRAM

CIRCUIT DESCRIPTION

PROTECTION CIRCUIT

Explains the function and operation of the unit's protection circuit.

ADJUSTMENTS

INITIAL ADJUSTMENT

Procedures for initial setup, including DC offset and idle current adjustment.

AGING

Specifies the duration for the aging process after initial adjustment.

FINAL ADJUSTMENT

Final calibration steps to ensure optimal performance.

PANEL FACILITIES

FRONT PANEL

Description of controls and indicators located on the front panel.

REAR PANEL

Description of input/output connectors and terminals on the rear panel.

SPECIFICATIONS

Amplifier Section

Technical performance specifications for the amplifier's audio output.

Power Supply/Miscellaneous

Details on power requirements, physical dimensions, and included accessories.