Pioneer A-450R 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’

Pioneer A-450R Specifications

General

Frequency Response	5 Hz to 100 kHz
Input Sensitivity (Line)	150 mV
Input Sensitivity (MM)	2.5mV
Signal to noise ratio (MM)	80 dB
Total Harmonic Distortion (THD)	0.05% (20Hz - 20kHz, 8 ohms)
Speaker Load Impedance	6 ohms to 16 ohms
Dimensions	420 x 125 x 350 mm
Power output per channel	60 W (8 ohms)