Pioneer A-550R - Service Manual

Y PIONEER’
The Art of Entertainment
Service
ORDER NO.
ARP2305
STERO AMPLIFIER
A-550R
A-550R-S
A-450R
A—550R, A—550R-—S AND A-—450R HAVE THE FOLLOWING :
Model
* Change the connection of the power transformer’s primary wiring.
Power Requirement
* This manual is applicable to the A — 550R/HE, HEWZ, A — 550R — S/HEWZ, A — 450R/HE and HEWZ
types.
* The A—550R-—S is the same as the A— 550R except for color.
¢ Ce manuel pour le service comprend les explications de réglage en francais.
e Este manual de servicio trata del método ajuste escrito en espanol.
CONTENTS
1. EXPLODED VIEWS, PACKING AND 5. ADJUSTMENT vovseeseeescrttttcsseetseettteeeenies 28
PARTS LIST cosrrtsceteessteecce rete eset eet eeeeeeereeees 2 5B.“ REGILAGE: tesciitacetseceivie leks eons hoiioan ented 29
2. SCHEMATIC DIAGRAM cececccccecrceeteteeeeeee teens 7 BASIS TE 2 seesiieeettegesshdatiesyaaain: buccal a eetyes 30
3. P.C.BOARDS CONNECTION DIAGRAM ------ 12 6. PANEL FACILITIES -----1e-seetrretrttrrtrtrretteee 31
4. PCB’s PARTS LIST -cccecccceerceeteceete tee ete teees 21 7. SPECIFICATIONS -ccccccccc creer ete e teen cere teen eens 33
PIONEER ELECTRONIC CORPORATION = 4-1, 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. 505 Cochrane Drive, Markham, Ontario L8R 8E3 Canada
PIONEER ELECTRONIC [EUROPE] N.V. Keetberglaan 1, 9120 Beveren, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia TEL: [03] 580-9911
© PIONEER ELECTRONIC CORPORATION 1991 DX JULY 1991 Printed in Taban’

Summary

Stereo Amplifier Models and Overview

Exploded Views, Packing, and Parts List

Parts List for A-550 R and A-550 R-S Models

Comprehensive list of parts for A-550R and A-550R-S models.

Parts List for A-450 R Model

Comprehensive list of parts specific to the A-450R model.

Packing and Exterior Views

Details on packing procedures and illustrations of the unit's exterior.

Schematic Diagram

P.C. Boards Connection Diagram

PCB Parts List

Adjustments

Idle Current Adjustment Procedure

Step-by-step guide to adjust idle current for optimal amplifier performance.

Panel Facilities Overview

Front Panel Controls Overview

Detailed descriptions of the front panel switches, indicators, and controls.

Specifications

Amplifier Performance Specifications

Covers power output, THD, dynamic power, frequency response, and input sensitivity.

Signal-to-Noise Ratio and Filters

Details S/N ratios for various inputs and specifications for the subsonic filter.

Power, Dimensions, and Accessories

Lists power requirements, consumption, physical dimensions, weight, and included accessories.

Pioneer A-550R Specifications

General

Brand	Pioneer
Model	A-550R
Category	Amplifier
Language	English