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NAD 3020B - 3020 B Schematic Diagram; 3120 Schematic Diagram

NAD 3020B
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3120
SCHEMATIC
DIAGRAM
D501
1N4148
x2
<j
425
H
01
NOTES
1
1
ALL
RESISTORS
ARE
1/4wt5%
CARBON
UNLESS
OTHERWISE
SPECIFIED,
2
ALL
DIODES
ARE
1N4148
UNLESS
OTHERWISE
SPECIFIED.
3
CAPACITANCE
ARE
IN
uF
UNLESS
OTHERWISE
SPECIFIED.
4
XMEANS
RESISTOR
WITH
CERAMIC
TUBE
STAND
UP
ON
THE
PC.B.
PRE
OUT
5
CL2MEANS
MOUNT
ON
COMMON
HEAT
SINK.
oF
6
%X
MEANS
R653
R654
WILL
BE
SHORTED
AFTER
OLE
CURRENT
ALIGNMENT.
TUNER
C
390
gsail
cas
18
sh
J
KG
}
7
BCsseB;
|
2B
v4
7
THE
VOLTAGE
SHOWN
ATEACH
POINTS
ARE
TESTED
ON
STATIC
CONDITON.
a
Gr
|
eh
BIS
Fl
soa
ae
V
8
ALL
SW
ARE
AT
OFF
POSITION.
TURBO
SW
AT
4
OHM
POSITION.
Fs
oF
oC
a
is
Bc549c]
BC556B
wy
9(
MEANS
TURBO
SW
AT
8
OHM
POSITIOM.
za
rae
boy
BAN
=
NOTES
2:
NOTE
4:
FUSES
RATING
RE
|
z
:
ax
1
SW-1
av.c:
POWER
SW.
UL.CA
SD.
FL.DM
d
£
(R504)
iS
u
FOR:
UK.AS
JL
&,
:
Fs
2
SW-2
a.
:
PHONO
SW.
S1.HK
EC.SA.
43
|
lo
A
a
°
7
A
=
3
v
3
SW-3
a0
+:
TUNER
SW.
F1.F2:1A/250¥
TLA/250V
oa
\
e
4
SW-4a.0
=
AUX
SW.
F3.F4:T&A/250V
T&A/250V
REC
Ret
|
Bd
ig
5
SW-5
a,b
:
TAPE
MONITOR
SW.
S
oO
Q
aq
M3
PRE
OUT
6
SW-60b
:
LOUDNESS
SW.
6542}
J
p+@
£70
fe
A
|
ao
SS
|
7
sWw-7
:
MONO.
a
|
TUNER
ca
|
3)
C531,
+208
|
Ee
G
2
=U,
&.
A
R54
+29,5V,
‘€)
2
Bog
a
f
150K
8
SW-8a.b
:
SOFT
CLIPPING.
PHONO
=
4
®
ie
a
)
V
Bis
9
SW-9
a.b
:
TURBO
SW.
ig
-622
+0
aa
-k
Vv Oo
v
”,
ae
:
a
NOTES
3:
ia
Sh
533
:
0
z
E
+30,5V
Ec
oa
(+33.3V)
xe
2SB669
Jin
BC546
2802602
c
280469
8C549
4
BC556
e
gan
+330
2N3085
a
>
390
22k
yo
“ae
a
MJ2985
=.
Rel
(FEL)
33
@[™\,
ZS
0615
3
23
Rea)
Hi
4)
42N3055
Sh
Q
®
2
NOR
IN
o
af
ae
+
|8
3
SPK_TML
FE
A
CS
BK
3
=
to]
aks
OWHITE
4
OHM
8
OHM
A
=
ORAN
LAB
IN
Q617
“BE
Bo]
|
3
?
eQn
@
ims2958
=
IN
|
LS
L
=
RED
swig
BI
ES
Fe
3g
cato
BLACK
_
SW-9a
V
eI
-30.5V
KA
s
S
/47035V
22P
|
0
ow
SW-9>
RED
18
(33.3)
f
*
24
2V
me
=
e
TEE!
0.0047
x
KBLO2]
Fg
5
ORAN
d
240V/50Hz
FOR
VERSION
8,81,
Q902
288649,
-30,5¥
Towne
©
Fe
oO
(-33.3v)
4.0HM
80HM
0.0047
220V/S0Hz
FOR
VERSION
C.CI,
O
°
+30.5V
Oo
Swit
3
g
3)
(+33.3v)
PHONE
is
718
JACK
x
Ab
0606
¢
+
32.3
Fe
SY
_gpsoe
4
.
~—\h
¢3
120V/60Hz
FOR
VERSION
A,
Al
220V/
50Hz
FQR
VERSION
C2
SPK
TML
NOR
IN
PREOUT
ke
R634
oo
fT
Seed
B
LAB_IN
cél4,
oe
22]
@
GAS
4
V
N
st
L
@
3
=
20702
a]
-2
+2
33)
-30.5
R714)
¢710}-e
Rilo}
R704)
EHO?
12)
+305
(-333)
10¥
-33
Vv
10ov
-(+33.3
ey
Sat
aay
8
6600
ry
Vv
[oom
J
Sw-8b
15—
Sa
AGe.
———
(
be

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