NAD 902 User manual
NAD)
SERVICE
MANUAL
MULTI
CHANNEL
AMPLIFIER
CONTENTS
DESCRIPTION
PAGE
FRONT
/
REAR
PANEL
VIEW
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DIAGRAM
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7-8
PCB
LAYOUT
(PARTS
SIDE)
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9-10
AMPLIFIER
ADJUSTMENT
............sssscsssssssssssssssssssssessssessssessssessseeessseeses
_
17
EAPLODED!
VIEW.
sxsctccissscexsipsccescicssctaitast
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saves
12
EXPLODED
PAR
TS.
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13
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14-15
PACKING
DIAGRAM
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16
SERVICE
CONTACT
INFORMATION
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17
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ge
FRONT/REAR
PANEL
VIEW
FRONT
PANEL
1.
Power
Button
2.
Power
LED
REAR
PANEL
CONNECTIONS
NOOR
ODM
=
.
Speaker
Terminals
.
Input
Level
Adj.
.
Line
Output
Input
.
Bridging
On/Off
.
Soft
Clipping
On/Off
.
AC
Line
Cord
(CH
1,
CH
2)
(CH
1,
CH
2)
(CH
1,
CH
2)
(CH
1,
CH
2)
(CH
1,
CH
2)
(CH
1,
CH
2)
SPECIFICATION
Measured
in
accordance
with
EIA
Standard
RS-490
(IHF
A
-202)
NAD-902
Multi-Channel
Amplifier
.
Continues
RMS.
power
output
into
8/4
ohms
load,
Both
channels
riven
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>
30/35
W
Sidiuel
RMS.
power
output
into
8
ohms
load,
(BRIDGED
mode)
......cecsssssssssssssssssssssssessssstssssssesseseessoeeecs
>
90
W
Rated
distortion
(THD.
20Hz.
-
2A
0,4
5b
2)
ieee
en
<
0.04%
NC
(ol
(eee
>
50
UGS
pacts
attested
aes
tree
stiches
tet
ae
seat
ea
sues
ecicesnes
35V
/
uSEC.
Damping
factor
(ref.
8
ohm,
1.9
94)
Reaper
ence
>
100
INPUt
IMPOCDENCE)
.....eeessesresesseessnsessassssunssssunsressssnsstitunsiuatiiatiietteeeeeeeecceccc
10k
ohm
//
220
pf
Input
sensitivity
(for
TW
OUTPUT)
on
ceccssssssssssessstssssstsescessesececcesecccee.
185
mV
(FOF
FATEH
POWET)
ecccicccccccsscssssssssssssssssssssssssstsseeseeseessecs
1000mV
WONG
OAU
ceeatecssctecccttsbeornte
cette
stoma
enbuseaccabeebeeetceeestucethactsnae.
ces
24.5
dB
FFEQUENCY
FESPONCE
(-3
AB)
errcesssssssssrssssssesssssssnsstssissttiepsteseeeeeseeeeeeecec
<
10
Hz
/
100kHz
(20
Hz
-
20k
Hz)
Sivett
itademtea
th
naeteNela
nies
<
-0.2
dB
S/N
Ratio
(A-WEIGNKE)
......eeccsssssssssssssscscssssssssssssssssssssssesssseercccess
>
100
dB
(un-weighted)
ssiuiscicatineedoeaioisne
swivels
faetinee
te.
>
90
dB
THD.
:
(ef.
Z5OMW
OUtPUt)
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<
0.04%
SMPTE
IMP.
(ref.
250MW
OULPUL)
coco.
wn
<S
0.04%
PHYSICAL
SPECIFICATIONS
—
Width
*
Height
*
Depth
oun...
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420
*
80
*
250
mm
Net
Weight
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greets
4.7
kg
SHIPPING
WEIGHT
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5.7
kg
Specifications
are
those
in
effect
at
the
time
of
printing.
NAD
reserves
the
right
to
change
specifications
4
eee
an
WIRING
DIAGRAM
YELLOW
VR602
IN/OUT
JACK
PCB
Vv
MAIN
AMP
PCB
POWER
LED
PCB
WHITE
O
POWER
SWITCH
PCB
POWER
SWITCH
PCB
JUMP.
WIRE
AC
120V:J501
J5S03
J505
J506
JS07
J509
J510
J513
J514
AC
220ViJ502
J504
J50
8
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J3l2@
J5is
AC
240ViJ502
J503
J509
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J51i2
Trt
POWER
SWITCH
POWER
TRANSFORMER
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SA
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SCHEMATIC
DIAGRAM
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POWER
TRANSFORMER
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NAD
Electronics
LTD.
CB
LAYOUT
(PARTS
SIDE)
|
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,
|
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a
al
P519
‘AC
INPUT
AMPLIFIER
ADJUSTMENT
EXPLODED
VIEW
2
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Q424-:
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9
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Q420
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Q403
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R
DUTPUT
P4095
of
Ye
|ee0*
INPUT
W501.
SA
W502
A.
IDLE
CURRENT
ADJUSTMENT
1.
Connect
DMM
across
P-401
(+)
and
P-403
(-),
adjust
VR-447
for
reading
of
5mV
+/-
0.56mV
DC.(without
a
load
across
the
output
terminals.)
2.
Repeat,
using
P-402
(+)
and
P-404
(-),
adjust
VR-448.
3.
Repeat
above
procedures
for
each
amplifier
module.
B.
FINAL
ADJUSTMENT
1.
Leave
power
on
minimum
5
minutes.
2
Repeat
idle
current
adjustments.
|
4
:
EXPLODED
PARTS
LIST
NO.
PART
NO.
DESCRIPTION
Q’TY
i
5541539000
PUSH
KNOB
{
2
5547
138200
BACK
PLATE
1
3
7033161156
SCREW
BRB
M3x8
S-PC
12
4
7001120216
SCREW
PAN
M2.5x4
4
5
5547
138100
FRONT
PLATE
1
6
7033160652
SCREW
BRB
M3x6
ZN-CC
2
7
7601170612
SCREW
BRB
M3x8
S-PC
2
g
5547
128700
PLATE
LEFT
1
9
7033160652
SCREW
BRB
M3x6
ZN-CC
2
10
5547
128810
PLATE
RIGHT
{
11
7033160652
SCREW
BRB
M3x6
ZN-CC
2
12
5541002100
TOP
COVER
1.
13
7190550003
SCREW
ISO
PPW
M4x6
S-PC
4
14
7033161156
SCREW
BRB
M3x8
S-PC
1
15
5547
138300
CHASSIS
1
16
7033160652
SCREW
BRB
M3x6
ZN-CC
7
17
7033161156
SCREW
BRB
M8x8
S-PC
2
18
5547501200
BUSHING
POWER
CORD
1
19
5547530460
PCB
SUPPORT
6
20
5547533
100
POWER
SW.
SHIELDER
1
21
5541215100
FRONT
PANEL
{
22
7034161152
SCREW
BFB
M3x8
ZN-CC
3
23
7033161156
SCREW
BRB
M8x8
S-PC
1
24
5542226
100
POWER
BEZEL
1
25
5547802120
FOOT
4
26
7000305022
SCREW
BTBW
M3x10
ZN-CC
4
27
5554436
100
POWER
SWITCH
:
28
5561320900
POWER
TRANSFORMER
{
29
7134250652
SCREW
PZS
M4x6
4
30
5545309800
HEAT
SINK
1
31
5545306910
HEAK
SINK
4
32
7033161152
SCREW
BRB
M3x8
ZN-CC
4
33
7076170012
NUT
ISO
N3
ZN-CC
|
8
34
7001171412
SCREW
ISO
PP
M3x10
ZN-CC
8
35
5547528700
TRANSISTOR
WASHER
8
36
7101200302
WASHER
TOOTH
LOOK
EXT
M3
8
37
7098160002
SPRING
WASHER
SW3
ZN-CC
8
38
5545308200
HEAT
SINK
|
4
39
7033161152
SCREW
BRB
M3x8
ZN-CC
4
SYMBOL
NO.
C445)
C446d
€501,C502
D401-D404
D405
,D406
D407,D408
D409,D410
D411-D414
D415-D418
D501-D504
F501,F502
L401,
1402
P401-P409
P410
Q401
,Q402
Q403,0404
Q405
,
0406
Q407,
0408
0409,
19410
Q’TY
PARTS
NO.
DESCRIPTION
SPECIFICATION
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HPA)
aw
Wa
a
Pe aA
SF
OA)
|
2
API
EA)
a
5090306052
5541539000
5547138200
7033161156
7001120216
5547138100
7033160652
7001170612
5547128710
7033160652
5547128810
7033160652
5541002100
7190550003
7033161156
5535448400
5547501200
5547530460
5547533100
5541215100
7034161152
7033161156
7033160652
5542226100
7000305022
6118017300
5554436100
5561320900
7134250652
5556702121
5090506008
5090406069
5090906164
5545309800
7033161152
7033161152
5545308200
5553135700
5213222091
5222110491
5232000100
6707020140
5210308100
6613003030
6615019740
6613007141
6613003030
6611000800
5554307501
5962000800
5556201900
95596103308
6621034501
6623002050
6621016701
6621015332
6623005000
6623003200
9947024210
7033161152
6621034600
7134161452
6621034600
7134161452
6621016900
39547024210
7033161152
6621016900
5547024210
7033161152
6621035000
7134161452
6621035000
CHASSIS
ASS‘Y
PUSH
KNOB
BACK
PLATE
SCREW
BRB
M3.0x08
S-PC
SCREW
FRONT
PLATE
SCREW
BRB
M3.0x06
S-ZN-CC
SCREW
ISO
PP
M3.0x06
S-ZN-CC
PLATE
LEFT
SCREW
BRB
M3.0x06
S-ZN-CC
PLATE
RIGHT
SCREW
BRB
M3.0x06
S-ZN-CC
TOP
COVER
SCREW
ISO
PPW
ZN-PC
(BLK)
SCREW
BRB
M3.0x08
S-PC
LIGHTNING
LABEL
CHASSIS
SCREW
BRB
M3.0x06
S-ZN-CC
SCREW
BRB
M3.0x08
S-PC
LIGHTNING
LABEL
BUSHING
POWER
CORD
PCB
SUPPORT
POWER
SW.
SHIELDER
FRONT
PANEL
SCREW
BPB
M3.0x08
S-ZN-CC
SCREW
BRB
M3.0x08
S-PC
SCREW
BRB
M3.0x06
S-ZN-CC
POWER
BEZEL
PCB
SUPPORT
FOOT
SCREW
BTBW
M3x10
S-ZN-CC
DIODE
LED
POWER
SWITCH
(UL/CSA)
POWER
TRANSFORMER
SCREW
PZS
M4.0x06
POWER
CORD
W/PLUG
BLK
SP-12
PCB
BLOCK
MAIN
PCB
ASS'Y
MAIN
AMP.
PCB
BLOCK
HEAT
SINK
SCREW
BRB
M3.0x08
S-ZN-CC
SCREW
BRB
M3.0x08
S-ZN-CC
SINK
AMP.
PCB
(305x95)
-
EL.
EL.
-
EL.
-
CERAMIC
CC45
-
CERAMIC
CC45
CAP.
EL.
=
Es
POLYESTER
-
POLYESTER
POLYESTER
CERAMIC
CK45
INSULATION
TUBING
CAP.
EL.
25x50
DIODE
SWITCHING
DIODE
SWITCHING
DIODE
SWITCHING
DIODE
ZENER
DIODE
SWITCHING
DIODE
SWITCHING
DIODE
RECTIFIER
FUSE
UL/CSA
5.2
x
COIL
SPRING
SQUARE
PIN
CONNECTOR
TR
NPN
HF
TR
PNP
HF
TR
NPN
HF
TR
NPN
HF
TR
PNP
HF
TR
PNP
HF
HEAT
SINK
SCREW
BRB
TR
PNP
HF
HEAT
SINK
SCREW
BRB
M3.0x08
S-ZN-CC
TR
NPN
HF
SCREW,TS
BRAZIER
HEAD
S-TITE
TR
NPN
HF
SCREW,TS
BRAZIER
HEAD
S-TITE
TR
NPN
HF
HEAT
SINK
SCREW
BRB
M3.0x08
S-ZN-CC
TR
NPN
HF
HEAT
SINK
SCREW
BRB
M3.0x08
S-ZN-CC
TR
NPN
HF
SCREW,TS
BRAZIER
HEAD
S-TITE
TR
NPN
HF
PVC
UL
CSA
G
20
SMT5
M3.0x08
S-ZN-CC
14
NAD
-902
NAD-2100
un
C
PAN
ND.
xs
MS
PC
NAD-902
C
RUD
3006
TS
ZN-CC
PAN
NAD-3225/7225
C
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NAD-310
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NAD-902
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TS
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C
PAN
MS
UL
SR-4N-4
&
B-7
SCB-6
NAD-906
NAD-902
,
C
FLT
C
RUD
C
RUD
3006
TS
ZN-CC
2100
SCB-6
NAD-7100
EL103GD
2MM
GREEN
SDDLB1007U-TT
TAM-PT-1210
(NAD-906)
PZS
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UL/CSA
SPT-2
41/0.16x2Cx2.1M
NAD-902
NAD
-902
NAD-902
NAD
-902
C
RUD
3008
TS
ZN-CC
C
RUD
3008
TS
ZN-CC
NAD
-3225/7225
oO
NAD
-906
22UFM
+/-20%
10V
220PFK
+/-10%
50V
22UFM
+/-20%
10V
33PFJ
+/-5%
50V
PFD
SOV
220UFM
3=+/-20%
16V
1UFM
+/-20%
50V
1OMFJ
+/-5%
50V
1OMFJ
+/-5%
50V
+/-5%
5
+/-20
.O1uF
%
500V
=105
Acts
600V
BLK
1.4mm
ae
l
+/-20%
50V
HZ2C2-TA
1SS81
200V
1A
T=52mm
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1N5401
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3.
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MEDIUM
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2SC2240-GR
LOW
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2SA1815-Y
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2SA970-GR
2SA1380D/E
NAD
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7220/3220
C
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3008
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2SA1380D/E
NAD
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see
ces
C
RUD
3008
TS
2803423-Y
PC=1.
ne
HFE=
120-240
M3.0X10
S-ZN-CC
2SC3423-Y
PC=1.2W
HFE=120-240
M3.0X10
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M:IS-313A
B:M
,
SYMBOL
NO.
R461
,R462
463°
R
R466,
R467
R468,R469
VR447,
VR448
W501-W504
W403
C433
C603-C606
C613,C614
5
R601,
R602
R605-R608
R609
,
R610
R616,R617
R619,
R620
S4
VR601
,
VR602
W601,
W602
D505
R501
B501
C504
$401,S402
Q’TyY
PARTS
NO.
DESCRIPTION
SPECIFICATION
Mae
Bae
NNR
A@ANN
NEN
AAP
ANNNN
FPP
SO
PNNN
ANNE
NNNNNNNNNNNN
SN
ENNNNNNNNNN
eNNNNNA2NNNNN
AeNANAN
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ao
7134161452
6623011600
7134161452
6622003100
7101200302
7001171412
5547528700
6622003100
7101200302
7098160002
7076170012
7076170012
7001171412
5547528700
6624002000
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=
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003200
339903
HPRAEBWWWERRLHPRRLRRHLPPRPHRPRHLHLSHLS
NNOOAONNNNNNNNNNNNN
NP
PNP
PND
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2110390
62160420
5547032210
5090906165
5556205420
5090906166
VUTIUTIUIUIUT
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UT
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UT
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TUT
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UU
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UT
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=
5236110491
5213447091
5213222091
6615019043
5556101904
6644066700
6621015332
5142110490
5142110290
5142110390
5133810103
5554439900
5554431610
5169010532
5556207600
5090406070
5090906167
6611007230
5142147290
5090906168
5553135600
5230102701
5554439900
SCREW,
TS
BRAZIER
HEAD
S-TITE
TR
PNP
HF
SCREW,
TS
BRAZIER
HEAD
S-TITE
TR
PNP
HF
SCREW,
TS
BRAZIER
HEAD
S-TITE
TR
PNP
LF
WASHER
TOOTH
LOCK-EXT
M3.0
SPRING
WASHER
SW3
S-ZN-CC
SCREW
ISO
M3.0(2.4H)
S-ZN-CC
SCREW
ISO
PP
S-ZN-CC
TRANSISTOR
WASHER
TR
PNP
LF
WASHER
TOOTH
LOCK-EXT
M3.0
SPRING
WASHER
SW3
S-ZN-CC
NUT
ISO
N3.0(2.4H)
S-ZN-CC
SCREW
ISO
PP
S-ZN-CC
TRANSISTOR
WASHER
“TR
PNP
LF
WASHER
TOOTH
LOCK-EXT
M3.0
SPRING WASHER
SW3
S-ZN-CC
NUT
ISO
N3.0(2.4H)
S-ZN-CC
SCREW
ISO
PP
S-ZN-CC
TRANSISTOR
WASHER
TR
PNP
LF
WASHER
TOOTH
LOCK-EXT
M3.0
SPRING
WASHER
SW3
S-ZN-CC
NUT
ISO
N3.0(2.4H)
S-ZN-CC
SCREW
ISO
PP
S-2N-CC
TRANSISTOR
WASHER
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
METAL
PLATE
CEMENT
RES.
METAL
OXIDE
FILM
MINI
RES.
METAL
OXIDE
FILM
MINI
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
VR
PNO6FB221AR
FUSE
CLIP
(5.2)
SPEAKER
TERMINAL
PCB
BLOCK
SPEAKER
TERMINAL
IN/OUT
JACK
PCB
BLOCK
CAP.
EL.
CAP.
CERAMIC
CC45
CAP.
SEMI.
CAP.
EL.
CAP.
EL.
DIODE
ZENER
MALE
WAFER
4P
IC
LINEAR
TR.
NPN
HF
TR.
PNP
HF
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
CARBON
FILM
RES.
FUSIBLE
SLIDE
SWITCH
SLIDE
SWITCH
SLIDE
SWITCH
SLIDE
SWITCH
VR.
2P
JACK-RCA
POWER
TERMINAL
PCB
ASS’Y
POWER
LED
PCB
BLOCK
DIODE
RECTIFIER
RES.
CARBON
FILM
POWER
TERMINAL
PCB
BLOCK
POWER
SWITCH
PCB
(69x95)
CAP.
CERAMIC
CK45
(KC)
SLIDE
SWITCH
15
M3.0X10
S-2N-CC
2SA1011-E
M:1IS-313A
B:M
M3.0X10
S-ZN-CC
2SA1011-E
M:IS-313A
B:M
M3.0X10
S-ZN-CC
MJ15022
M3.0
S-ZN-C
D3.1xD5.
5x0.
7T
C
PAN
M3.0x10
NAD
-
7220/3220
MJ15022
M3.0
S-ZN-CC
D3.1xD5.9x0.7T
M3.0x12+SW
S-ZN-CC
C
PAN
M3.0x10
NAD
-
7220/3220
MJ15023
M3.
0x12+SW
S-
ZN-CC
C
PAN
M3.0x10
NAD
-
7220/3220
MJ15023
M3.0
S-ZN-CC
D3.1xD5.9x0.7T
M3.0x12+SW
S-ZN-CC
C
PAN
M3.0x
NAD
-
7220/3220
2K2
/6W
22K
+/-5%
1/6W
470
+/-5%
1/6W
15K
+/-5%
1/6W
910
+/-5%
1/6W
1K8
+/-5%
1/6W
910
+/-5%
1/6W
15K
+/-5%
1/6W
100
=
=+/-5%
1/6W
1K2
+/-5%
1/6W
430
+/-5%
1/6W
10K
+/-5%
1/6W
470
+/-5%
1/6W
2K2
1/6W
6k8
+/-5%
1/6W
4K7
+/-5%
1/6W
39
+/-5%
1/6W
1K8
+/-5%
1/6W
820
+/-5%
1/6W
33
+/-5%
1/6W
0
+/-5%
1/6W
0.22
+/-10%
5W
3.9
+/-5%
1W
10
+/-5%
IW
6K8
+/-5%
1/6W
2K2
1/6W
10K
+/-5%
1/6W
220
OHM
+/-20%
F5x5
CQ-203S
NAD
-906
$0-6249
NAD
-906
22UFM
+/-20%
16V
68PF
J
+/-5%
5O0V
O.1UFK
+/-10%
25V
G7UFM-
+/-20%
25V
22UFM
+/-20%
10V
H218-2-TA
IL-G-4P-S3L2-E
NJM2068DLN
DIP8
2SC1815-Y
TPE2
conten
Wie
TAPING
K
100K
+/-5%
1/6W
1K
+/-5%
1/6W
10K
+/-5%
1/6W
100
+/-5%
1/4W
14A
SLWK22-09
SSSEO22NB1-NB1-TT
SLWK22-09
SSSE022NB1-NB1-TT
20KB
TT
RKO9K1130008
2
1N4002
100V
1A
T=
om
4K7
+/-5%
1/6W
NAD
-902
NAD-906
4700PFM*
+/-20%
400V
SLWK22-09
ewan
nA
ACES
aa
ot
i
CE
4
F
:
}
{
,
F
;
PACKING
DIAGRAM
ITEM
PARTS
NO.
PARTS
NAME
Q'TY
“1
9520520155
=SsiCiEPS
PAD
tt
2
9530520155
EPE
BAG
1
3
9535122554
OWNER’S
MANUAL
1
4
95
10523355
INNER
CARTON
1
4
)
NOTES:
Proprietary
information
for
servicing
purposes
only.
The
information
given
herein
may
not
be
used
commercially
without
the
prior
written
agreement
of
NAD
Electronics
LTD,
London,
England.
|
g(
4
17
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