Pioneer a 656 s service manual

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GD PIONEER

The future of sound and vision.

Sefiice __ . . A_
manual ffggé ..=_=@j ORDER No.

fl ARP1817

STEREO AMPLIFIER

A" B 5 B
A-BSS-S

MODELS A-656 AND A-656~S HAS FIVE VERSIONS:

Applicable model
Type Power roqukemom Export down-flan
A-BBG A-BEB-S

HEZ O O ACZZOV. Z4OV (switchabiark West Germany

HE O - ACZZOV, 240V (switchablerk Europian continent

HB O _. AC22OV, 240V (switol'rablelfl< Unltad Kingdom

KC 0 -- AC1 20V only Canada

SD 0 ACI 10V, 120V- 127V. 220V, 240V Kingdom of Saudi Arabia and general

(switchablelvk market

aICIuanga the primary wiring oi the power transformer

0 This manual is applicable to the A-656/HEZ, HE, HB and A-656-SIHEZ types.
- A-656-S is Silver version of A-656.
- For the other types. refer to additional service manual.

CONTENTS

1. EXPLODED VIEWS AND PARTS LIST ~~ 2 5. FOR HE, HB AND A-656-S/HEZ TYPES --------- 21
2. SCHEMATIC DIAGRAM -------------------- - 6 6. PANEL FACILITIES ---------------------- .

3. P.C.BOARDS CONNECTION DIAGRAM ~- 9 7. SPECIFICASIONS ...................................... 35
4. ELECTRICAL PARTS LIST --------------------------- 17

PIONEER ELECTRONIC CORPORATION 44, Meguro 1~Chomer MeguroAku, Tokyo 153, Japan

PIONEER ELECTRONICS SERVICE INC PO. Box 1760. Long Beach, California 90801 U.S.A.

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

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

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

© PIONEER ELECTRONIC CORPORATION 1989 YA MAY 1989 Hand in Japan.

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1. EXPLODED VIEWS AND PARTS LIST

NOTES:
0

Pam withoul part number cannot be supplied.
0 The A mark found on some component parts indicates the impanance of the safety
fatter of the part. Therefore, when replacing, be sure to use part: of identical designa-

(ion.

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

ROTARY KNOB M
ROTARY KNOBS
PUSH KNOB
DIRECT KNOB

Mark No ParlNo. Description PartNo Description
G 1 23A1302 TRANSISTOR Q3 5 ..............................
{L 2 2SAISO2 TRANSISTOR 04 52 ARCH-'16 OPERATINGINSTRUCTIONS
L 3 2803281 TRANSISTOR GI 53 AHAIOTO STYROL PROTECTOR
L A 28C3281 TRANSISTOR 02 54 AHDIBSS PACKING CASE
5 RBI/4PM CARBON FILM RESIST 55 ANEIUIS METAL BONNET
6 RBI/4PM CARBON FILM RESIST 56 ' """"""""
i 7 ACHIOAS ELECTROLYTIC CAPAC 57 SPEAKER SWITCH
8 CKDY847 CERAMIC CAPACITOR 58 AWZ2349 TONE AMP
A 9 AT81210 POWER TRANSFORMER 59 REC OUT
A IO ASG-552 SWITCH SI 60 AWZ235I INPUT SELECTOR
1] ASU1024 SWITCH $3 5] ..............................
I2 ASUIO25 SWITCH S2 62 HEAD PHONE
13 ASUIOZS SWITCH $4 63 AWZ2335 POWER AMP
A 14 AEK-403 FUSE(T2. 5A)FU1 64 AW22336 POWER SUPPLY
A 15 ADGIOAQ AC POWER CORD 65 AW22337 SPEAKER TERM
16 ANLIOZS LONG SHAFT ASSY 66 AWZ2338 PHONO AMP
I7 AMRIISQ FOOT 67 SHELD
IB ABFIOD2 SPACER 68 TERMINAL SCREW
19 ABF1017 WASHER 69 EARTH LEAD
20 ABHIOBS SPRING 70 TRANS FRAME
21 ABH1034 SPRING 71 RIGHT FRAME
22 AEC-BBZ STRAIN RELIEF 72 REAR PANEL
23 AEEIOIA SHEET 73 PANEL STAY
24 AEHIOOS ADHESIVE TAPE 74 BOTTOM PLATE
25 ABA-298 SCREW 75 HEAT SINK
26 ABAIOU4 SCREW (STEEL) 76 HEATSINK
27 ABAlooe SCREW (STEEL) 77 HEATSINK HOLDER
28 ABAIOII SCREW (STEEL) 78 VOLUME HOLDER
29 ABAIOM SCREW (STEEL) 79 SHELD CASE(SP)
30 ABA1047 SCREW (STEEL) 80 SHELD CASE B
31 ABA1046 SCREW (STEEL) 81 DAMPER
32 ABAIDSD SCREW (STEEL) 82 CUSHION RUBBER C
33 ABAIDSZ SCREW 83 CUSHION SPACER
34 ABA1088 SCREW 84 CUSHION RUBBER
35 ABM-048 FLANGE NUT M9 85 NYLON BINDER
36 ABM-065 NUT 86 P.C.B HOLDER
37 FBTAOPOB SCREW 57 NVLON RIBET
38 NKQOFCU NUT 88 SPACER
39 VM230P06 SCREW 89 SPACER
40 AMRII'IS HOLDER 90 BINDER
A ANBI2 5 FRONT PANEL ST CLAMPER
4 AMBIZ O BASE 92 -------------
4 AAMIO 9 NAME PLATE (METAL) 93 PUSH JOINT
A AMRII 0 INDICATING LENS 94
4 AABII 7 'ROTARY KNOBL 95 SHEET
4 AAB 8
A AAB 9
I: AAD 6
d AAD 0
5 AAD I

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POWER K NOB