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NAD 402 User manual

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AM/FM
TUNER
§
GN
©
er
YANNL
WA/INV
IWANVIW
SADIAUAS
cOV
|
@
@
TABLE
OF
CONTENTS
SPEGIFIGATIONS:.
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ALIGNMENT
PROCEDURE
EM
Tuner:
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Bh
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AMITUNGht
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Instrument
Set-up
©
IC
BLOCK
DIAGRAMS
«0
PCB
LAYOUTS:
#5.
c°o
bed
we
GS
Ae
kk
Bee
Be
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WIRING
DIAGRAM:
380s
f0R She
dee Bo
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SCHEMATIC
DIAGRAMS
TURGI:
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Bo
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EG
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PbS
Display:
2
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PE
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SES
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EXPLODED
VIEW
Shp
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ck
See
Be
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EXPLODED
VIEW
PARTS.
LIST’
“25:5
<
Sos
bee
eee
ath
Se
easy
Behe
S
ELECTRICAL
PARTSLIST
--
0
tt
PACKING
DIAGRAM:
#308
4 @
feck
see
g
Ne
dha
A
ele
Sale
Sasa
BS
SERVICE
SAFETY
PRECAUTIONS
4
Use
exact
replacement
parts
for
critical
locations,
marked
J/\"
on
parts
list.
2.
Return
lead
dress
to
original
position,
and
re-install
protective
covers.
3.
Before
returning
to
customer,
test
for
shock
hazard;
use
either
method
A
or
B:
A.
Leakage
test,
"cold":
1.
Unplug
AC
cord,
turn
power
switch
ON.
2.
Connect
one
lead
of
High
Voltage
Insulation
Tester
to
both
prongs
of
AC
plug.
3.
Touch
other
lead
to
all
exposed
metal
parts.
4.
Impedance
measurement
must
be
0.3
-
5.0
Megohms.
B.
Leakage
test,
"live":
1.
Plug
unit
directly
into
AC
outlet;
do
not
use
isolation
transformer.
2.
Connect
one
lead
of
Leakage
Current
Tester
to
earth
ground.
3.
Touch
other
lead
to
all
exposed
metal
parts.
4.
Leakage
measurement
must
be
less
than
0.5
milliamps.
SPECIFICATIONS
Specifications
are
measured
in
accordance
with
ANSI-IEEE
Standard
185
(1975),
i.e.
IHF
T-200
for
tuners.
FM
TUNER
SECTION
50dB
quieting
60dB
quieting
Capture
ratio
(45dBf)
IF
rejection
Image
rejection
AM
suppression
Selectivity,
alternate
channel
Channel
separation
(1kHz)
Usable
sensitivity
(Q8MHZ,
75
ONMS)
.........:cecceese
ee
ete
t
er
ee
eeee
etter
tere
rte
ent
e
teeta
cee
AH=
1.5uV
C=
2.0uV
Mono=
2.5uV
Stereo=
30.0uV
Mono,
AH=
7.0uV
C=
9.0uV
Stereo=100.0uV
at
Teh
RE
deed
adi
el
ote
eee
dmacgsees
Ak
Cases
et
ic
a
trae
Me
ae
ales
nev
es
AH=
2.0dB
C=
4.5dB
diene
Co
es
wai
Nace,
Ph
ces
ot
thelen
cod
scteth
laud
Bc
oes
haad
ate
uadueanneae
sag
snenpocigucuaatasennnens®
75dB
«Sth
Sind
gabe
ac
hans
4
Sues
e
Gan
Ged
diagneaten
dees
Waele
ou
nnae
Sddves
ge
tWARE
RAGIN
aa
dee
Reson
sea
EE
aes
74dB
sea
toe
dh
debe
Dial
abaeutica
dos
hernata
ahve
tebe
lethal
Rode
DERERT
ca
tne
Cum
Obata
TOG
ERTe
trad
Te
pa
eies
eee
eR
54dB
rata
wh
Poa
dace
b
la
pu
ost
inn
dus
vte
le
beanadutuatatgntae
seminars
dante
cacticasttaas
AH=
60dB
C=
78dB
Subcarrier
suppression
(19kKHZ
and
38KHZ)
«0.2.00...
ccc
esses
terete
treet
ten
rne
entrees
erste
60dB
Sb
ge
haba
cals
saved
od
bebeba
il
va
a
dak
asda
gacoun
oasis
taesag
encase
Mono,
1kHz,100%
mod.,
AH=
0.20
%
50%
mod.,
C=
0.20
%
Stereo
L-R,
1kHz,100%
mod.,
AH=
0.12%
50%
mod.,
=
0.30%
Stereo
L+R,
1kKHz,100%
mod.,
AH=
0.20
%
50%
mod.,
C=
0.20%
Signal/Noise
ratio
(65dBf
IHF
wtd)
............
eee
settee
reece
teens
tenes
testes
reece
eeeeens
Mono=
73dB
Stereo=
70dB
Frequency
response
(30HZ-15KHZ)
.........:c
cece
eee
rete
teeter
teeters
tres
ee
resets
seeeeeseestesneg
gece
+0.7dB
chica
ah
Dua
eeual
she
ee
Sas
eat
ee
eu
at
aanlee
ena
etna
sbbsenehanssamianaa
hex
AH=
41dB
C=
40dB
5
hn
BGS
Seas
stale
ve
wee
had
nadeddeseeamsuans
shwdu
sin
dude
sane
gtedibarau
tants
Taakulienedsatiay
3.2
-
6.3uV
Center
tune
sensitivity
Stereo
indicator
Autosearch
sensitivity
On
@
5.6
-
8.9uV
Off
@
4.5
-
74uV
6.3
-
17.8uV
AM
TUNER
SECTION
Usable:
S@nsitivity)
oc..scccc.c0s
idee
sie
thins
Palscindol
ac
ated
ciatett
a
ha
dee
eee
a
Poe
nen
ee
7uVv
SOlECtTIVI
ty
ici
ecg
eds
piewesenssneedictd
eo
hissed
laswboeskeh
s
coacgerenheedses
ba
tua
essann
sees
Pustcansemanane
et
ewe
oe
Teee
19d0B
Image
PejectiOn:...dccseericcesehtinetsaeene
ee
ene
ie
clad
saa
isles
gs
pea
ne
dan
Sua
ees
sg
Aosta
ee
PeaS
36dB
Signal/Noise
ratio
(1MV
iNpUt)
2.2...
cere
cree
errr
n
Er
re
errr
sada
eee
e
eee
a
nee
eeeee
naan
e
rated
45dB
Bide
DR
(CL
Sate
atoYs
PE
Wi
hal]
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0
ene
enn
cm
tee
ne
mE
ae
ania
enn
eT
re
eT
tar
Ter
ery
eee
cree
2
%
Autosearch
Sensitivity
2.0.0.0...
eee
cee
ee
cece
eer
tre
rere
nett
te
aa
eee
eee
ena
neeeeeaeeenae
es
28.2
-
141.2uV
IF
re
je
Chi
OM
ceseicccceussanc
et
hiicdace
accede
en
Ged
av
ep
cite
couch
gutted
amend
doa
baes
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tet
ates
gaenase
cee
the
46dB
PHYSICAL
Dimensions
(Width
x
Height
x
Depth)
«2.0.00.
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420
x
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295mm
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actheate
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3.6
kgs(8
Ibs)
SHIPPING
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te
Seevhd
crabs
poessnssans
bea
lect
vanesespepdanatndeacshaue
anhalt
neeetesys
4
kgs(Q
Ibs)
Power
consumption
at
120
or
230VAC,
50/60HZ
..........000
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dvd
ALIGNMENT
PROCEDURE
NOTE:
1.
To
change
AM
steps
from
9kHz
to
10kHz
and
vice
versa,
press
the
MODE
and
SCAN
UP
buttons
simultaneously
for
three
seconds.
2.
To
reset
the
presets,
press
the
AM
FM
and
STORE
buttons
simultaneously
for
three
seconds.
FM
SECTION
A.
PREPARATION
1.
Set
stereo
modulator
to
mono
mode
with
1kHz
modulating
signal
unless
otherwise
stated.
2.
Set
signal
generator
to
FM
mode
with
75kHz
deviation.
3.
Store
the
following
frequencies:
98MHz,
87.5MHz,
108MHz,
90MHz,
and
106MHz.
4.
Note:
RF
levels
are
open
circuit
voltages
of
signal
generator
with
75
ohms
output
impedance.
B.
OSCILLATOR
TUNING
VOLTAGE
1.
Connect
DVM
between
TP6
and
ground.
2.
Tune
to
87.5MHz
and
check
DVM
for
a
reading
of
3VDC
+0.5V.
3.
Tune
to
108MHz
and
check
DVM
for
a
reading
of
20.5VDC
+0.5V.
if
either
of
the
above
is
out
of
tolerance,
adjust
FE4
(oscillator
coil)
until
both
readings
are
within
tolerance.
Connect
DVM
between
TP4
(VA)
and
TP5
(VB).
Apply
10.7MHz
(90dBu)
via
1Kohm
resistor
to
TP7.
Adjust
L8
for
OVDC
+50mV
reading
on
DVM.
Adjust
L9
until
minimum
THD
is
achieved
at
audio
output.
Repeat
(3)
and
(4)
until
no
further
improvement
can
be
made.
akwONaE
When
adjusting
L9,
two
nulls
can
be
found.
With
the
core
on
top,
adjust
until
the
second
one
is
found
as
this
has
lower
THD.
Correct
position
of
the
core
is
normally
just
above
the
metal
casing.
D.
SYNTHESIZER
1|.F.
TRACKING
Maintain
connection
of
DVM
but
disconnect
10.7MHz
tap
at
TP7.
Apply
98MHz
(60dBu)
to
FM
antenna
input
and
tune
to
98MHz.
Adjust
C16
for
OVDC
+20mV
reading
on
DVM.
Fine
adjust
L9
for
minimum
THD.
Repeat
(3)
and
(4)
until
no
further
improvement
can
be
made.
Oy
Bs
GOO)
E.
FRONT-END
LF.
1.
Connect
DVM
between
TP3
(level)
and
ground.
2.
Turn
R48A
fully
clockwise
and
R48
fully
counterclockwise.
3.
Apply
98MHz
(12dBu)
to
antenna
input.
4.
Carefully
adjust
FE5
to
obtain
minimum
reading
on
DVM.
There
should
only
be
one
minimum.
F.
R.F.
1.
Apply
98MHz
(6dBu)
to
antenna
input.
2.
Check
if
THD
is
better
than
3%.
If
not,
proceed
to
(3).
3.
Adjust
FE1,
FE2,
and
FE3
by
squeezing
or
stretching
using
a
non-metallic
tool
until
THD
is
better
than
3%.
4.
Check
THD
at
90OMHz
and
106MHz
with
7dBu
input.
If
THD
is
more
than
3%
for
both
fre-
quencies,
re-adjust
until
required
THD
is
met.
G.
AUTOSEARCH
LEVEL
1.
Turn
R48
fully
clockwise
and
R48A
fully
counterclockwise.
Set
stereo
modulator
to
L=-R
mode
and
apply
98MHz
(18dBu)
to
antenna
input.
Adjust
R48
counterclockwise
until
center
tune
LED
lights
up.
OF
ON
Check
if
autosearch
operation
is
«working
properly
at
antenna
input
level
of
28dBu.
Center
tune
LED
should
be
at
least
2dBu
higher
than
FM
stereo
LED.
H.
STEREO
SEPARATION
AND
PILOT
SUPPRESSION
1.
Modulate
L-only
at
98MHz
(60dBu)
and
adjust
R62
for
minimum
output
on
right
channel.
2.
Modulate
R-only
and
adiust
R62
for
minimum
output
on
left
channel.
3.
Repeat
(1)
and
(2)
until
readings
are
the
same
and
within
specification.
4.
Turn
off
modulating
signal
but
leave
pilot
tone.
5.
Adjust
FL401
and
FL402
for
minimum
output
on
left
and
right
channels,
respectively.
AM
SECTION
A.
PREPARATION
1.
Set
signal
generator
to
AM
mode
with
1kHz
at
30%
modulation.
2.
Connect
22pF
ceramic
capacitor
between
signal
generator
and
AM
antenna
input
terminal.
Capacitor
should
be
as
close
as
possible
to
antenna
input
terminal.
3.
Store
the
following
frequencies:
603/600kHz,
999/1000kHz,
and
1404/1400kHz.
B.
OSCILLATOR
TUNING
VOLTAGE
1.
Connect
DVM
between
TP6
and
ground.
2.
Tune
to
603/600kHz
and
adjust
L6
for
1.75VDC
+50mV
reading
on
DVM.
C.
LF.
1.
Apply
999/1000kHz
(45dBu)
to
antenna
input.
2.
Tune
to
999/1000kHz
and
adjust
L7
for
maximum
reading
on
audio
output.
D.
R.F.
1.
Apply
603/600kHz
(45dBu)
to
antenna
input.
2.
Tune
to
603/600kHz
and
adjust
L5
for
maximum
reading
on
audio
output.
3.
Apply
1404/1400kHz
(45dBu)
to
antenna
input.
4.
Tune
to
1404/1400kHz
adjust
C26
for
maximum
reading
on
audio
output.
5.
Repeat
(1)
to
(4)
until
no
further
improvement
can
be
made.
TPS
R62
FL402
FL401
(VB)
18
LO
C16
TP6
®
e
s
ise
RASS
LEA
TPS
R48A
RABEL?
C26
TP4
i
L6
(LEVEL)
(vA)
TUNER
ADJUSTMENT
POINTS
5.
Increase
antenna
input
signal
to
22dBu
and
adjust
R48A
clockwise
until
FM
stereo
LED
lights
up.
]
;
INSTRUMENT
SET-UP
aa
STEREO
MODULATOR
SIGNAL
GENERATOR
DUMMY
ANTENNA
TUNER
OUT
ANTENNA
TERMINAL
UNIT
UNDER
TEST
OSCILLOSCOPE
IHF
FILTER
OUTPUT—CONNECTED
INSTRUMENTS
IC
BLOCK
DIAGRAMS
TMS70CX0
LC7582
peer
OLLLLLLLLILLL
LL
LLL
La
A
Ga
X24C01
256
Bytes
RAM
(Registers)
_
Bus
Exponsion
\/o
Control
Addr
/Data
LM7000
LA1266
@
PCB
LAYOUT
|
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PCB
POWER
SWITCH
PCB
ore
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(I
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DISPLAY
PCB
TRANSFORMER
PCB
T315mA/25BV
x2
§
CAUTION:
RePLAcE
WITH
SAME
TYPE
FUSE
ATTENTION:
UTILISER
UN
FUSIBLE
DE
RECHANGE
OE
MEME
TYPE
TUNER
PCB
FP-402-B
oO
t
c
w
Zz
2
=
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