NAD 1240 User manual

NAD|SERVICE
MANUAL
1240
STEREO
PREAMPLIFIER

CONTENTS
-1240-
REAR
/
FRONT
PANEL
CONNECTIONS
‘SPECIFICATIONS
EXPLODED
PARTS
LIST
EXPLODED
VIEW
SCHEMATIC
DIAGRAM
PCB
LAYOUT
AND
COMPONENT
LOCATION
PARTS
LIST
PACKING
DIAGRAM
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE

REAR
PANEL
1.
AC
Line
Cord.
NOWPWNH
Phono
Ground.
.
Phono
Input.
.
Phono
Capacitance.
.
MM/MC
Selector.
.
Tuner
Input.
PHONO
CAPACITANCE
[INPUT
7
A
100P
220P
320P
FRONT
PANEL
Onfh
dN
=
.
Power.
.
Phones.
.
Bass.
.
Treble.
.
Bass
EQ.
.
!nfrasonic
Filter
Off.
a
POWER
PHONES
@
¢
Lo
&
26)
cH
8.
CD
Input.
.
AC
Outlets
(not
in
U.K.
version).
9.
Video
Sound
Input.
10.
Auxiliary
1
Input.
11.
Auxiliary
2
Input.
12.
Tape
Input/Output.
13.
Preamp
Outputs
(2).
VIDEO
[
TAPE]
OUT
eas
AUX
2
SOUND
OUT
IN
1
©}
Or®
Llobionle
ren:
TUNER
AUX
1
GND
cD
MC
MM
SS,
©
inane
4
63
8
~
10
T1
9
12 13
7.
Mono.
8.
Tape
Monitor.
9.
Input
Selector.
10.
Low
Level:
11.
Loudness.
12.
Volume/Balance.
CAUTION
RISK
OF
ELECTRIC
SHOCK
DO
NOTOPEN
.
CAUTION:
TO:
REOUCE
THE
RISK
OF
ELECTRIC
SHOCK,
DO
NOT
REMOVE
COVER
(OR
BACK).
NO
USER-SERVICEABLE
PARTS
INSIDE.
REFER
SERVICING
TO
QUALIFIED
SERVICE
PERSONNEL
SWITCHED
UNSWITCHED
MAX
300W
MAX
300W
Stereo
Preamplifier
1240
BASS
TREBLE
PHONO
CD
BASS
INFRA
TAPE
EQ
OFF
MONO
MONITOR
VIDEO
SOUND
AUX
2
TUNER
(i)
-
BALANCE
~@>—
VOLUME
LOW
LEVEL
LOUDNESS.
nl
10
1
42
5
ae
tae
ratoniemenn
eet
seem
ne
nel
2

Specifications
NAD
1240
Stereo
PreAmplifier
Note:
Specifications
are
measured
in
accordancae
with
EIA
Standard
RS-490
(IHF
A-202).
Measurements
referred
to
the
Normal
output.
Output
level
are
13
dB
higher
at
the
High
output;
for
this
output,
divide
the
normal
input
sensitivity
by
4.6.
Phono
Input
| |
Input
Impedance(MM
or
MC)
Video)
Input
Sensitivity
MM
(1
KHz,
0O.5V
out)
MC
Input
Overload
at
MM
20Hz/1KHz/20KHz
MC
Signal/Noise
ratio,
IHF
A-weighted,
with
MM
cartridge
connected
MC
THD
(20Hz-20KHz)
and
IM
Distortion
at
+30
dB
level
RIAA
response
accurace
Line
Level
Inputs
(Tuner,
Type,
CD,
Input
Impedance
Input
Sensitivity(0.5V
out)
Maximum
Tnput
Signal
THD
Signal/Noise
ratio,
A-weighted
Frequency
Response
Outputs
Output
Impedance
Tape
(REC)
Normal
High
Phones
Maximum
Output
Level
Tape
(REC)
Normal
High/Phones
Controls
Treble
Bass
Bass
Equalization
Infrasonic
Filter)
|
Low
Level
(audio
muting)
Physical
Specifications
Width
x
Height
x
Depth
Net
Weight
Shipping
Weight
Power
Consumption
17
~=W
R=47Kohm
C=100/226/320
pF
1.5
mV
100uV
|
20/180/1500
mV
1.5/13/110
mV
85
dB
re
5
mV
75
daB
re
0.5
mV
<0.04
%
+0.5
dB
i
qdB
re
0.5V
out
Z
Source
Z
+
1000
ohms
800
ohm
150
ohm
|
100
ohm
(will
drive
all
headphone
impedances)
9
V
9
V
13V
into
50
Kohm
load
eA
9V
into
600
ohm
|
a
300mV
into
8
ohm
+7
dB
at.
10
kHz
+9.5
dB
at
50
Hz
+2
dB
at
70
Hz,
+5
dB
at
40
Hz
-3
dB
at
9
Hz,
12
dB/octave
-20
dB
+1
dB
|
42cm.x
7.62cm.x
26cm.
6.5in.x
3in.x
10.25in.
4.25kg
(9lb.
602.)
4.7
kg
(101b.
5o0z.)
50/60
Hz
at
110, 120,
20,
or
240
VAC
ea

EXPLODED
LIsT
|
ITEM,
PARTS
NUMBER
DESCRIPTION
|
SPECIALITY
#£=Q’TY
1
L5f80B004HO1
CABINET-BOTTOM
1
2
L561B006HO1
CABINET
1
3
L702A016HO2
PANEL-FRONT
|
1
4
L547B009HO1
CHASSIS
FRONT
SUB
1
5
L582B003H05
COVER-BACK
1
6
L547BO008HO1
FRAME
(R)
1
7
L547B007HO1
FRAME:
(L)
1
8
L541D089HO1
BRACK,
PCB
SUPPORT
1
9
L704D062H0O1
KNOB-VOLUME
1
10
L704D065H0O1
KNOB-BALANCE
1
11
L704D064HO1
KNOB-ROTTARY
3
12
L704D061H01
KNOB-PUSH
6
13.
L704D061HO2
KNOB-POWER
1
14
L550D037H0O2
FELT
RING
1
15
L550D037H01
FELT
RING
3
16
L241A066H13
PCB-MAIN
LED
1
17
L241A066H12
PCB-MAIN
.
HEADPHONE
1
18
L241A066HO1
PCB-MAIN
(PRE
AMP)
1
19
L550D036HO1
GUIDE
SHAFT
1
20
L531D017HO2
SHAFT
ROTARY
1
21
L562D022HO1
SLEEVE,
INPUT
SELECTOR
SW
1
22
L350Y078HO1
TRANS-POWER
A?
1
22
L350Y049HO1
TRANS-POWER
Ai
1
22
L350Y050HO1
TRANS-POWER
A
1
3
22
L350Y051HO1
TRANS-POWER
B,
Bl
1
ha
22
350Y052HO1
TRANS-POWER
Che
Cy
C2
1
Lal
22
L350Y053HO1
TRANS-POWER
C3
1
>
23
L771DO006HO1
FOOT
RUBBER,12-1543
4
24
L552D015HO1
CUSHION
SPONGE
2
25
L540D501HO1
CLAMPER
1
a
26
L242Y501HO1
POWER-CORD
Al,
A
1
fe
26
U242C872HO6
POWER-CORD
B
1
a
26
U242C809H19
POWER-CORD
C2.
Cis.
c
1
26
L242Y013H01
POWER-CORD
Bl
1
e
26
L242C310HO1
POWER-CORD
C3
1
al
27
L449Y002HO2
AC
SOCKET
4
0,
28
L531D018HO1
SHAFTT-GND,
3020
1
"7
29
L650D005HO2
SCREW-B,
M4X5
4
30
U650S025H31
SCREW-P
M4*10
4
i
31
U656S263H23
T-SCREW
2-3*6
6
32
U656S164H24
T-SCREW
1-3%*8
10
33
U6568164H24
T-SCREW
|
1-3*8
5
34
U656S263H23
T-SCREW
|
2-3%*6
10
gen
35
U669S074HO9
SCREW-METAL
7
TRANS
FIX,3*5
2
YQ
36
U650S063H19
SCREW-B
|
|
M3*6
|
8
37
U656S164H23
T-SCREW
—
-1-3*6
8
38
U685S100HO8
E-RING
5
2
39
L683D011HO1
WASHER
POST
1
40
U680S322H03
WASHER
TOOTHED
3
3
41
L670D004HO1
NUT,
3020
M3.5
1
42
L670D002HO1
NUT-GND,
3020
_
|
1
L840D009HO1
COVER
AC
SOCKET
|
A,A1,C2,C3
1

R247
(WG
ONLY)
REG
100
R243
470
OO
©
SW
TAPE
MONITOR
C245
220P
(WG
ONLY)
NAD
1240
SCHEMATIC
DIAGRAM
BASS
EO
SW
®
50KMN
BALANCE
|
oO
LION
3.27MHesco6oe
C213
0.018
C221
68P
R227
150
BPs
ica
SL
JINFRASONIC
SW
(WG
ONLY
c2ol
R245
22
303
4.7/50
C215
0.0082
C217
0.0075
9
pees
“4
O
AUX
|
a56j
Cee.
ack
{(S)
PHONO
S5,NH
+5
R225
N
a
O
wee
:
N
R325
-
:
R215
R217
C225
0
PHONO
R303
IM
+
(WG
ONLY)
Bee
RECS
C207
c249
150P]
gag3
27K
I20K
|R2I9
10K
160
10/16
=
20KB
C307
A
aa
sibs
onyas
jt
‘Tove
TRS
2SC2602
©
TUNER
Puce
VOLUNE
0.
a
301
;
—
at
R237
C229
|
ae
ig
ie
=
Bail
a
MM/MC
6243
62237
Reo
e
cez9_
INPUT
_
SELECTOR
TI
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sla
aN
25K363
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eeee
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SW
WG
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R309
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7
220P
4,
R223
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R3IZ
120K
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ONLY)
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33/25
200
nee
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:
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EO;
BASS
IOKC
LEVEL
tn
R213
sw
/
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C3257
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220
C2iI9
2200/63
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180K
10/25
C319
C317
R315
(3)
=
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AUX
2
BOK
D504
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ais
:
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eae
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me
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AUX
|
R244
C323
TREBLE
C321
(3)
470
=
ol
liOKC
0.018
R208
one
ie
C206
TUNER
3K9
SW
TAPE
MONITOR
220P
©
GC
LIo2
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:
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(WG
ONLY)
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r
3.7MH
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C2l2
56P
C214
0.018
C222
68P
R228
150
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SOUND
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we
ell
Q202
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cae
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zx
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AUX
2
=
ere
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c202
C218
R226
;
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C329
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Pong
L204
4.7/50
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0.0082
0.0075
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+,,
gop
R332
ate
R246
(WG
_|
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|
|
R216
R28
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C226
|
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PHONG
SW
23
5
C327
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ONLY
22
ONLY)
|
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ONLY)
|
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wes
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IN448
|
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|
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|
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[100/25
2SC2602
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5OKMN
BALANCE
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‘
hii:
fae
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ee
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INPUT
SELECTOR
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INF
RASONIC
SW
R333
=
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SW
(we
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SW
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|
|
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R308
loo
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R222
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ies
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VOLUNE
0.1
47P
Q302
LOUDNESS
SW
R306
C316
100P
2SK363
58K
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R328
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680
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C515
4700P
400VAC
C5I6
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2
|
NO.
|
POWER
SUPPLY
AC
JACK
HO}
HO2
AC
120V
6OHzZ
US/CN
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4
PCS
AC
220V 50HZ
EU
seis)
AC
240V
5OHZ
UK
fOr
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Q502
258649
HOS
HOS
AC
220V
50HZ
WG

NAD
1240
PCB
COMPONENT
LOCATION
|
FI/F2
—
A.A1.C3
:
250MA
125¥
B
Bl
C
Cl
C2:T
250MA
CAUTION:
FOR
CONTINUED
PROTECTION
AGAINST
RISK
OF
FIRE,
REPLACE
ONLY
WITH
TYPE
FU
assis
me
nee
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13
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