Pioneer a 450 service manual

Page 1

- ORDER N0.
1 ARP2305

The above illustration shows the model A-550R.

STERO AMPLIFIER

A-EEIR

A-EEDR-S
A-4EDR

A - 550R, A - 550R - 8 AND A - 450R HAVE THE FOLLOWING :

Model

Type Power Requirement Remarks
A-SSOR A-SSOR-S A-450R

HE O --- O AC220V - 230V, 240V ISwitchable)

HEWZ O O O AC220V -- 230V, 240V (Switchablel

' Change the connection of the power transformer's primary wiring.

0 This manual is applicable to the A - 550R/HE, HEWZ, A - 550R - S/HEWZ, A - 450R/HE and HEWZ

types.
0 The A - 550R - S is the same as the A - 550R except for color.
0 Ce manual pour la service comprend Ies explications de réglage en francais.
0 Este manual de servicio trata del método ajuste escrito en espahol.

CONTENTS

1. EXPLODED VIEWS, PACKING AND 5. ADJUSTMENT --------------------------------------- 28
PARTS LIST ............................................. 2 5. REGLAGE ............................................. 29

2. SCHEMATIC DIAGRAM .............................. 7 5' AJUSTE ................................................ 30

3. P.C.BOARDS CONNECTION DIAGRAM ------ 12 6. PANEL FACILITIES --------------------------------- 31

4. PCB's PARTS LIST ................................. 21 7. SPECIFICATIONS .................................... 33

PIONEER ELECTRONIC CORPORATION 4-1, Meguro l-Chome, Meguro-ku, Tokyo 153. Japan

PIONEER ELECTRONICS SERVICE INC. PO. Box 1760, Long Beach. California 90801 USA.

PIONEER ELECTRONICS OF CANADA, INC. 505 Cochrane Drive. Markham, Ontario L3H 8E3 Canada

PIONEER ELECTRONIC [EUROPE] N.V. Keetberglaan I. 9120 Beveren. Belgium

PIONEER ELECTRONICS AUSTRALIA PTY. UD. 178-184 Boundary Road. Braeside, Victoria 3195. Australia TEL: [03] 580-9911

DX JULY 1991 Printed in Belgium

Page 2

1. EXPLODED VIEWS, PACKING AND PARTS LIST

NOTES:

0 The parts with an encircled number are generally unavailable because they are not in our Master Spare Parts List.

0 The A mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing,
be sure to use parts of identical designation.

0 Parts marked by " © " are not always kept in stock. Their delivery time may be longer than usual or they may be unavailable.

1.1 PARTS LIST OF A- 550R AND A- 550R-S TYPES

Mark No. Description . Parts No. MN" N°~ Descriptlon PM! N0-
26 CUSHION (RUBBER) AEBlO74
1 $1335; KNOB S (BASS' M31155 27 CUSHION C (RUBBER) AEB-27o
1 ROTARY KNOB S (BASS, AABlZ38 23 NYLON BINDER ABC-093
TREBLE)(A-550R-S type) 29 RIVET AEC-441
2 ROTARY KNOB L (VOLUME AAB116o 30 STRAIN RELIEF ABC-832
CONTROL) 31
2 ROTARY KNOB L (VOLUME AAB1161 """"""""
CONTROL) (A- 550R - 8 type) 32 LED ASSEMBLY sza495
3 ROTARY KNOB R (PLS) M81162 (9) 33 CONTROL ASSEMBLY AWZ3496
3 ROTARY KNOB R (A-SSOR-S M31163 34 ROTARY FUNC. ASSEMBLY AW23497
Type). 35 DRY CELL BATTERY AEX-021
4 ROTARY KNOB M AAB1231 (1103» AAA)
4 gflfififigfifimm M31236 36 STYROL PROTECTOR AHA1335
(REC/INPUT SELECTOR) 37 PACKING CASE AHD2130
(A- 550R -S type) 37 PACKING CASE (A-550R- S AHD2131
5 PUSH KNOB (STANDBY) AAD1246 type)
5 PUSH KNOB (STANDBY) AAD2033 38 EYE ASSEMBLY AWZ3498
(A-SSOR-S type) 39 PACKING SHEET AHG1016
. 4o TERMINAL SCREW AKE- 031
6 PUSH KNOB C (SPEAKERS, AAD1366
DIRECT. PHONO SELECTOR) 41 PLUG AKM1004
6 PUSH KNOB C (SPEAKERS, AAD1367 A 42 AC SOCKET 3-P AKP-502
DIRECT. PHONO SELECTOR) 43 PANEL BASE AMBIGSI
(A - 550R - 3 type) 43 PANEL BASE(A-550R- S type) AM81652
7 PUSH KNOB (SUBSONIC. AAD1536 44 INDICATING LENS AMR1160
LOUDNESS) 45 INSULATOR ASSY AMR2140
7 PUSH KNOB (SUBSONIC, AAD1538
LOUDNESS) (A-550R-S type) 46 ARM AMR2142
8 POWER KNOB ' AAD1984 47 MICA SHEET AMR2295
8 POWER KNOB (A - 550R - S AAD2040 48 CHASSIS ANA1065
type, 49 FRONT PANEL ANB1462
9 TACT KNOB (MUTING) AAD2003 49 FRONT PANEL (A -550R- S ANBl477
9 TACT KNOB (MUTING) AAD2032 type)
(A - 550R - S type) 50 REAR PANEL ANC1712
10 SENSOR WINDOW AAK1783
51 SHIELD ASSEMBLY szzseo
11 POWER SW ASSEMBLY AW23493 52 BOTTOM PLATE ANF1085
12 NAME PLATE (METAL) AAM1029 53 PCB HOLDER ANG1198
13 SCREW ABA-298 54 HEAT SINK HOLDER ANGI340
14 SCREW (STEEL) ABA1009 55 PCB HOLDER ANGl580
15 SCREW (STEEL) ABAIOll
56 HEAT SINK ANH1259
16 SCREW (STEEL) ABA1016 57 SUB HEAT SINK ANH1325
17 SCREW (STEEL) ABA1047 58 ROD ANR-879
18 SCREW (STEEL) ABA1048 59 OPERATING INSTRUCTIONS ARE1201
19 SCREW (STEEL) ABA1050 (English, French, German.
20 SCREW ABA1082 Italian, Dutch, Swedish, Spanish,
Portugues) (HE type)
21 BUSH ABF1018 59 OPERATING INSTRUCTIONS ARC1278
22 SPRING ABH-osz (German) (HEWZ type)
23 SPRING ABH1034 60 HEADPHONE ASSEMBLY AWZ3484
24 NUT ABN-065
A 25 AC POWER com) 361049 © 61 AF COMPLEX ASSEMBLY AW23487
© 62 TONE ASSEMBLY AW23491