Pioneer a 443 service manual

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The future of sound and vision.

ORDER NO.
ARP1581

STEREO AMPLIFIER

A-443
A-443-S
A-333
A-333-S

A443, A4436, AND A-333, A-333-S HAVE FIVE VERSIONS:

Applicable model
Type Power requirement Dutination

A443 A-443-S A-333 A-333-S
RE 0 -- O - AC220V, 240V Iswitchable) European continent
H8 0 - O -- AC220V, 240V (switchableI' United Kingdom
HEZ O O O O ACZZOV, 240V Iswitchable) West Germany
KC 0 - - - AC120V only Canada
SD 0 - - -- AC1 10V, 120V-127V, 220V, 240V Kingdom of Saudi Arabia and general
(switchable) market

'Change the primary wiring of the power transformer.

0 This manual is applicable to the A443/HE, HB, HEZ, A-443-S/HEZ, A-333/HE, HB, HEZ and A-333-S/

HEZ types.
0 For the other types, refer to additional service manual.

0 The A-443-S is silver versions of A-443.
0 The A-333-S is silver versions of A-333.

CONTENTS

I. EXPLODED VIEW AND PARTS LIST ........ 2 6. FOR A443/HB, HEZ AND A443-S/HEZ TYPES. 19
2. PACKING ........................... 5 7. FOR A-333/HE, HB, HEZ AND A-333-S/HEZ

3. SCHEMATIC DIAGRAM ................. 6 TYPES ............................. 22
4. P.C.BOARDS CONNECTION DIAGRAM ...... 9 8. SPECIFICATIONS ..................... 37
5. ELECTRICAL PARTS LIST ............... 16 9. PANEL FACILITIES .................... 39

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-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 L3R 8E3 Canada

PIONEER ELECTRONIC [EUROPE] N.V. Keetberglaan 1. 2740 Beveren. Belgium

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

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1.

0 Parts without part number cannot be supplied.
0 The A; mark found on some component parts indicates the impotance of the safety factor of the part. Therefore. when
replacing. be sure to use parts of identical designation.

- For your parts Stock Control, the fast moving items are indicated with the marks ** and *.

ink GENERALLY MOVES FASTER THAN *_
This classification shall be adjusted by each distributor because it depends on model number. temperature. humidity, etc.
0 Parts marked by (9" are not always kept in stock. Their delivery time may be longer than usual or they may be unavailable.

Parts List of Exterior

Mark No. Part No. Description
1 AWZ1885 TONE assembly
2 AWZ1890 AF complex assembly
A** 3 2SA1302 Transistor (Q3. 04)
A** 4 2803281 Transistor (Q1, 02)
5 RDR%PM6R8J Carbon resistor (R1)
6 COMXA104J100 Capacitor (C1)
A k 7 ATS1137 Power transformer
(T1 AC220/240V)
** 8 ASU1012 Remote slide switch
(REC SELECTOR: $2)
** 9 ASU1014 Remote slide switch
(INPUT SELECTOR : Si)
A** 10 AEK-403 Fuse (FU1 T2.5A)
11 AMR1350 Insulator assembly
12 AMR1353 Insulator assembly
13 AAB1064 Knob (VOLUME)
14 AAB1066 Knob (REC SELECTOR.
INPUT SELECTOR)
15 AAB1068 Knob (BASS. TREBLE.
BALANCE)
16 AAD-418 Knob B (SPEAKERS)
17 AAD1162 Knob (SUBSONIC.
LOUDNESS. DIRECT)
18 AAD1343 Knob (POWER)
19 AAD1366 Knob C (MUTING. PHONO
SELECTOR)
20 AAM-O3O Name plate
21 AMB1334 Panel base
22 AMR1160 LED lens
23 ANB1180 Front panel
24 ABH-052 Coil spring 8
25 ABH1034 Coil spring 8
A 26 AEC-882 Strain relief
27 AEE1014 Mica sheet
28 AKM1019 Pin jack joint
29 ABA-297 Screw M4x0.7
30 ABA-298 Screw
31 ABA1009 Screw
32 ABA1011 Screw
33 ABA1034 Screw
34 ABA1048 Screw
35 ABA1050 Screw

EXPLODED VIEW AND PARTS LIST

NOTES :

Mark No. Part No. Description
36 ABN-065 Nut
37 ADG1019 AC power cord
38 NK70FUC Nut
39 NK90FUC Nut
40 VMZ3OP060FCU Screw
41 AZN 1 746 Bonnet
42 AMR1161 Joint arm
101 PHONO AMP assembly
102 HEAD PHONE assembly
103 LED assembly
104 Terminal (GND)
105 Chassis
106 Rear panel
107 Bottom plate
108 Switch holder
109 Heat sink
110 ......
111 Nylon rivet
112 Spacer
113 TRANSISTOR assembly
114 Speaker switch assembly