Pioneer A-676-G User manual

WY PIONEER’
The Art of Entertainment
Setvice
ALEVE
om
:
STEREO
AMPLIFIER
A-676-G
..
@ Refer to the service manual ARP2240 for A-676.
@ This manual is applicable to A-676-G/HEZ.
© A-676-G is the same as A-676 except for color.
CONTRAST
OF
MISCELLANEOUS
PARTS
NOTES:
¢ Part without part number cannot be supplied.
©
The
&\
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.
©
Parts
marked
by
“®”
are
not
always
kept
in
stock.
Their
delivery
time
may
be
longer
than
usual
or
they
may
be
unavailable.
A-676-G/HEZ
and
A-676/HEWZ
have
the
same
construction
except
for
the
following:
Part No.
Mark
Symbol
&
Description
Remarks
. ‘A-676/HEWZ A-676-G/HEZ
Rotary knob L AAB1222 ‘AAB1287
Rotary knob M ‘AAB1223 AAB1288
Rotary konb S AAB1224 ‘AAB1289
Push knob AAD1536 AAD2287
Direct knob ‘AAD1560 AAD2288
Power knob AAD2010 AAD2302
Name plate ‘AAM1028 Non supply
Packing case AHD2068 AHD2311
Panel base AMB1799 AMB2005
Front panel ANB1455, ‘ANB1524
Operating instructions arcs | ese
(German)
Operating instructions =| nee ARETI94
(English, French, German,
Italian, Dutch, Swedish,
Spanish, Portugues)
Screw FBT40PO80FZK FBT40PO80FCR
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.
300
Allstate
Parkway
Markham,
Ontario
LR
OP2
Canada
PIONEER
ELECTRONIC
[EUROPE]
N.V._
Haven
1087
Keetberglaan
1,
9120
Melsele,
Belgium
PIONEER
ELECTRONICS
AUSTRALIA
PTY.
LTD.
178-184
Boundary
Road,
Braeside,
Victoria
3195,
Australia
TEL:
[03]
580-9911
©
PIONEER
ELECTRONIC
CORPORATION
1992
ra
apn,
oop
bated
titeBor

@
PIONEER’
|
JOM
The Art of Entertainment
Service
ORDER NO.
ARP2240
c/Manual
STEREO AMPLIFIER
A-676
A-676-S
A-—676
AND
A—676—S
HAVE
THE
FOLLOWING
:
Model
T
Power
Requirement
Remarks
ug
A-676
A-676-S
im
c
HE
AC220V—230V, 240V (switchable) >
HB AC220V—230V, 240V (switchable) >
sD
AC110V,
120V—127V,
220V,
240V
(switchable)
HEWZ
AC220V~230V,
240V
(switchable)
>
|
+ Change the connection of the power transformer primary pins.
*
This
manual
is
applicable
to
the
A—676/HE,
HB,
SD,
HEWZ
and
A—676—S/HEWZ
types.
©
As
to
the
HB, SD,
HEWZ
and
A—676—S/HEWZ
types,
refer
to
page
30.
«
The
A—676—S
is
the
same
as
the
A—
676
except
for
color.
CONTENTS
1,
EXPLODED
VIEWS,
PACKING
AND
5.
FOR
HB,
HEWZ,
SD
AND
A—676-—S/
PARTS
LIST
--
202
HEWZ
TYPES
----
2.
SCHEMATIC
DIAGRAM
-----
vA
6.
PANEL
FACILITIES
3.
P.C.BOARDS
CONNECTION
DIAGRAM:
2
7.
SPECIFICATIONS
4,
PCB’s
PARTS
LIST
+25
8.
ADJUSTMENTS
-
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
LR
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
HD
Wie
4
©
PIONEER
ELECTRONIC
CORPORATION
1991
YX
MAY
1991
Printed
in
Japan

A-676
1. EXPLODED VIEWS, PACKING AND PARTS LIST
NOTES:
© Parts without part number cannot be supplied.
© 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 designa-
tion,
© Parts marked by “®” are not always kept in stock. Their delivery time may be longer
. than usual or they may be unavailable.
Parts list of Exterior and Packing
Mark No. Description Parts No. Mark No. Description Parts No.
1 ROTARY KNOBL (VOLUME) AAB1222 36 SPEAKER SWITCH
2 ROTARY KNOB M AABI223 ASSEMBLY
(REC SELECTOR, 37 CLAMPER
INPUT SELECTOR) 38 STYROL PROTECTOR AHA1070
3 ROTARY KNOB S (SPEAKERS, AAB1224 39 PACKING CASE AHD2069
BASS, TREBLE, BALANCE, 40 PACKING SHEET
PHONO SELECTOR)
41 TERMINAL SCREW
4 PUSH KNOB (LOUDNESS, AAD1536 42 PANEL BASE AMB1799
ADPT/TAPE3) 43 FOOT AMR1159
5 DIRECT KNOB AAD1560 44 INDICATING LENS. AMR1160
45 HOLDER AMR1178
6 POWER KNOB AAD2010
7 REC OUT ASSEMBLY 46 PUSH JOINT
8 NAME PLATE (METAL) AAM1029 47 HEAT SINK HOLDER F
9 SCREW ABA-—298 48 HEAT SINK HOLDER R
10 SCREW (STEEL) ABA1004 49 RIGHT FRAME
50 TRANS. FRAME
11 SCREW (STEEL) ABA1009
12 SCREW (STEEL) ABAIOLIL 51 FRONT PANEL ANB1455
13 SCREW (STEEL) ABA1014 52 REAR PANEL
14 SCREW (STEEL) ABA1047 53 PANEL STAY
15. SCREW (STEEL) ABA1048 54 POWER L ASSEMBLY AWZ3418
55 BOTTOM PLATE
16 SCREW (STEEL) ABA1050
17 SCREW ABA1056 56 VOLUME HOLDER
18 SCREW ABA1082 57 VOLUME HOLDER
19 SCREW ABA1088 ASSEMBLY
20. SPACER ABF1002 58 POWER ASSEMBLY HOLDER
®)
21 WASHER ABF1017 59 POWER ASSEMBLY HOLDER
22 SPRING ABH1033 )
23°
SPRING
ABH1034
60
EARTH
PLATE
24 NUT ABN—065
25 FLANGE NUT M9 ABN—072 61 TRANSISTOR HOLDER
62 HEAT SINK
A 26 ~=— AC POWER CORD ADG1049 63 HEAT SINK
27 CUSHION C (RUBBER) 64 LONGSHAFT ASSEMBLY — ANL1040
28 NYLON BINDER 65 OPERATING INSTRUCTIONS ARE1194
© 29 POWER R ASSEMBLY AW2z3421 (English, French, German,
30 STRAIN RELIEF AEC-—882 Italian, Dutch, Swedish,
Spanish, Portuguese)
31. SPACER
32 NYLON RIVET AECI160 ® 66 TONE AMP ASSEMBLY AWZ3445
33 INPUT SELECTOR © 67 POWER SUPPLY ASSEMBLY AWZ3426
ASSEMBLY 68 SPEAKER TERM. ASSEMBLY
34 SPACER 69 PHONO AMP ASSEMBLY AWZ3436
35 SHEET AEE1014 70 BONNET CASE AZN1804

Mark No. Description Parts No.
71 SCREW FBT40P080FZK
72 NUT NK90FCU
73 SCREW VMZ30P060FCU
A. 74 ELECTROLYTIC CAPACIT —ACH1194
(Cl)
A 7 ~~ FUSE (T2.5A, FU3) AEK-512
A. 76 ~=TRANSISTOR (Q1) 2SC3281
A 77 ~~ TRANSISTOR (Q155) 28C4137
A 78 ~~ TRANSISTOR (Q156) 2SC4137
A. 79 TRANSISTOR (Q2) 28C3281
A 80 ~—- TRANSISTOR (Q3) 2SA1302
A, 81. TRANSISTOR (Q4) 2SA1302
A 82. ~~ PUSH SWITCH (S1) ASG1006
83 SWITCH (S2) ASU1039
84 SWITCH (S3) ASU1038
85 SWITCH (S4) ASU1026
A, 86. «POWER TRANSFORMER (T1) ATS1352
iC) 87 VR ASSEMBLY AWZ3441
88 HEAD PHONE ASSEMBLY
89 DIODE ASSEMBLY
90 SCREW ABA1129
91 WASHER ABE-053
¢ Packing
¢ Exterior
73

¢ Exterior
~

A-676
SD type only SD type only _/ AC socket (AKP—515)
of B
(AKX—507)
8 3 2 3 3 °
&
& s >

a-676 I P I 3 I 4 I 5 1 8 l 7
2. SCHEMATIC DIAGRAM
| PHONO AMP bly
(AWZ3436)
PHONO
et
TAPER
B PLAY
r
TAPE1
PLAY
r
TUNER
L
LINE
L

POWER R assem bly (AWZ3421)
POWER SUPPLY assembly :
(AWZ3426)
ee

VR assembly (1/2) (AWZ3441) SPEAKER TERM. assembly
[HEAD PHONE
assembly
SPEAKER SWITCH assemb!
“ie e136 DIODE
assembly|
POWER R assembly (AWZ3421) ss. 398-4 T|aSSi 3
POWER SUPPLY assembly
(AWZ3426)
VR assembly (2/2) (AWZ3441)

J
1
I
2
I
.
Ts
¢
POWER
SUPPLY
SECTION
(SD
type)
«
‘A
POWER
TRANSFORMER
be
°
Cie
VoLTAGe_seuecror!
Cite
Vourace_sevecr
A
oS
A
ant
(zai
ot
ot
©
at
I
ony
o
—
w
os
des
13
a
=
piplele
ss
POWER
SUPPLY
assembly
(AWZ3426)
aig)
Aétoos
Arcotiol|
$837
te
ogy
FUSS
B
ee
8
p13
Te
piz pis
as
yyswirenen|
|
swvzcneo
ih
AS
POWER
CORO
yew S00
aww
sSa
ost
A
fl
“<
prow
+
Sersore
eS
|
EER
1,
RESISTORS:
Indicated
in
,
%W,
YeW,#5%
tolerance
unless
otherwise
noted
k
:k®,
imme
MO,
(F)
:
£1%,
(G)
:
#2%,
(K)
:
#
10%
(M);
+20%
tolerance
2.
CAPACITORS:
Indicated
in
capacity
(uF)/voltage
(V)
unless
otherwise
noted
p
:
pF
Indication
without
voltage
is
50V
except
electrolytic
capacitor.
3.
VOLTAGE, CURRENT:
Signal
voltage
at
(WW
+
W
—
8)output
(1kHz)
DC
voltage
(V)
at
no
input
signal
Value
in
(
_)
is
DC
voltage
at
rated
power.
C
SS
mA:
DC
current
at
no
input
signal
LINE
VOLTAGE
SELECTION
c
4,
OTHERS:
(For
A—676/HE,
HB
,HEWZ
and
=>
:
Signal
route.
A-—676—S/HEWZ
types.)
@
:
Adjusting
point.
The
A\
Hed
found
on
some
component
parts
indicates
the im-
Line
voltage
can
be
changed
with
the
following
steps.
jortance
of
the
safety
factor
of
the
part.
Therefore,
when
replacing,
.
2
a
sia
aie
th
eae
1.
Disconnect
the
AC
Power
cord.
be sure to use parts of identical designation.
%
marked
capacitors
and
resistors
have
parts
numbers.
2.
Remove
the
top
cover.
3. Change the connection of the power transformer primary
wes = This is the basic schematic diagram, but the actual circuit may vary pins.
due to improvements in design.
Voltage Power transformer Pin No.
‘SWITCHES:
220V
3
Sl
POWER
SW
240V
5
TONE
AMP
assembly
Stick
"
301
TAPES
ON/OFF
4,
the
line
voltage
label
on
thé
rear
panel.
$302 LOUDNRSS ON/OFF
D
Part
No.
Description
D
SPEAKER
SWITCH
assembly
=
$401
SPEAKER
A,B(OFF/A/B/A+B)
AAX—193
220V
label
AAX—192 240V label
INPUT SELECTOR assembly
S701 INPUT SELECTOR
$702 REC SELECTOR
S703 DIRECT
PHONO AMP assembly
$501
PHONO
SELECTOR
44
l
:
I
?
I
°
I

A-676/SD
3. P.C.BOARDS CONNECTION DIAGRAM
ve
¢ POWER SUPPLY SECTION (SD type)
DIODE ass: embly
12
Tl
POWER TRANSFORMER __
% 120V.
lov. ‘6
ov 5
120V__ 64
uov__ 33
ov 2
1
N\S2
LINE VOLTAGE
SELECTOR
AC SOCKET
A UNSWITCHED
1SOW
“INOLINALIV A A\SWITCHED
= 7 A
G22> $I A oot Cons
AC MOV/I20-127v/
220V/240V
50/60Hz
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Praca) ranaor a e
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23" 5] SP) ate : c
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aes, +, Fhe diode terminal marked wit cre cathode side.
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:
ihe
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P.C.B.
connection
diagram
is
viewed
from
the
foil
side.
:
wi
(—-
C
A
Age
Sa
can
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| 3 : | 4 I 5 |
REC OUT assembly
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=
of ue Fo bos! F yes
TONE AMP assembly (AWZ3445)
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POWER
R
assembly
@
POWER
L
maeonehy
(AWZ3421)
(AWZ3418)
-_—
el
|
LS
c
)
——
5
:
SPEAKER
TERM
assembly
oa
_
l
4
l
2
I
3
I
4
I
5
I
6
I

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TL
POWER TRANSFORMER
POWER L assembly
(AWZ3418)
K
sages
{ 1
SPEAKER TERM assembly
4
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HEAD PHONE
j
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2
a
assembly
= y
Te
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230V,
|
|
la
m “FUSES SHOULD BE O
THE SAME TYPE AND RATINGS ONL
A
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HEWZ ONLY
POWER SUPPLY —
assembly (AWZ3426)
7 I 8
SPEAKER:
SPEAKER SWITCH assembly
9
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A-676
4. PCB’s PARTS LIST
NOTES:
© Parts without part number cannot be supplied.
©
Parts’marked
by
“®”
are
not
always
kept
in
stock.
Their
delivery
time
may
be
longer
than
usual
or
they
may
be
unavail-
able.
© 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.
© When ordering resistors, first convert resistance values into code form as shown in the following examples.
Ex.1 | When here sie ae een digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J =
5%, ai vei i
5002 S6X10!— 56. RDIAPSAB DS
47kQ = 47X103— 47. RDIAPSOD GI
052 Ol RN2HO BGK
12 Ox RSIP@MMK
Ex.2 When there are 3 effective digits (such as in high precision metal film resistors).
5.622 562X10! 5621 _. RNIASR BD F
Mark
No.
Description
Parts
No.
Mark
No.
Description
Parts
No.
©
TONE
AMP
ASSEMBLY
(AWZ3445)
RESISTORS.
SEMICONDUCTORS
VR301
VARIABLE
RESISTOR
ACT1053
VR302, 303 VARIABLE RESISTOR ACT1054
1€301 OP—AMP-IC M5220P = :
Other resistors RDIMPMOICN
Q307, 308 TRANSISTOR 2SC1845
D301 LED (RED) AEL1004
D302
LED
AEL1084
SPEAKER
SWITCH
ASSEMBLY
D305, 306 ~~: LED (RED) ‘AEL1004 Witch
SWITCHES $401 SWITCH ASD1003
$301,302 PUSH SWITCH ASG1019 Ghenertons
CAPACITORS
401,
402.“
ELECTR.CAPACITOR
CEAS3R3M50
301,302 ELECTR.CAPACITOR CEAS2R2MS50
303,304 © CERAMIC CAPACITOR CCCSL470]50 ResISTOnS
305,306 © ELECTR.CAPACITOR CEAS2R2M50 All resistors RDIAPMOO
C309, 310 AUDIO FILM CFTXA153350
CAPACITOR
311,312 AUDIO FILM CFTXA823350
CAPACITOR, INPUT SELECTOR ASSEMBLY
313,314 MYLOR FILM CQMA332K50 SWITCH
CAPACITOR $701,702 SWITCH ASULOI6
C315, 316 AUDIO FILM CFTXA183]50 $703 PUSH SWITCH ‘ASG1032
CAPACITOR
317,318 ELECTR.CAPACITOR CEAS2R2M50 CAPACITORS
321,322 + CERAMIC CAPACITOR CCCSL390]50
2 C701-704 | CERAMIC CAPACITOR CKDYB331K50
S827 B28 AO CETESE STO 705,706. | CERAMIC CAPACITOR CKCYB331K500
C707-710 CERAMIC CAPACITOR CKDYB331K50
eagndao- © RUpIO FAL Gere ateuiso C711, 712 CERAMIC CAPACITOR CKDYB391K50
CAPACITOR
331,332 ELECTR.CAPACITOR CEAS470M25 RESISTORS
C333, 334 ~~ ELECTR.CAPACITOR CEAS331M25 All resistors RDUAPM2215
339,340 ELECTR.CAPACITOR CEAS100M25 OTHERS
351,352 CERAMIC CAPACITOR CCDSL680]50 BN TACK OP) ‘anitor
PIN JACK (6P) ‘AKB1008
cNe CONNECTOR (ISP) KPE1S
25