NAD Electronics 7020 Service Manual
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AM/FM
FM
AM
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BEPVICE
NAD
MODEL
BTEPEO
STARTING
Stereo
Rece,ver
7020
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90
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Speak-s
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oft
A+B
94
92
BOss
•
•
•
MANUAL
7020
RECEIVER
SERIAL
AT
Soft
CIppng
96
98
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FM
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CONTENTS
SPECI
FICATION
BLOCK
ALIGNMENT
ALIGNMENT
P.C.B.
P.C.B.
CIRCUIT
ASSEMBLY
WIRING
PARTS
PACKING
DIAGRAM
PARTS
PARTS
DIAGRAM
DIAGRAM
LIST
PROCEDURE
DIAGRAM
LOCATION—i
LOCATION—2
DIAGRAM
DIAGRAM
&
INSIDE
VIEW
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
PAGE
c...
‘I
2
3
4
5
5
6
7
8
9
10
18
c
1
SPEC
I
FICATION
a
FM
Tuner
Sensitivity1HF,
nput
to
Signal
Frequency
De-emphasis
Channel
Selectivity,
Capture
AM
Image
IF.
SCA
Pilot
THD
THD
AM
Suppression
Rejection
Rejection
Rejection
Signal
100%
at
Stereo1KHz
Tuner
Sensitivity
Usable
Sensitivity
Rejection
Image
Rejection
IF
Section
Audio
*
measurements
new
Amplifier
Power
*Continuous
Rated
*Clipping
Clipping
Dynamic
Dynamic
*Rctive
*Transient
*Slew
Slew
Damping
T.H.D
S.M.P.T.E
I.H.F
T.I.M
Frequency
Frequency
Preamplifier
*1
nput
Input
Input
T.H.D
RIAA
Signal
High
Level
*1
nput
Input
Signal
*Maximum
Frequency
Controls
Bass
Treble
Infrasonic
Power
Consumption
Weight
Dimension
Separation
Ratio
Section
dB
30
Noise
1HF,50dB
Ratio(Aweighted,at65
Response,
Accuracy
Alternate
Suppression
Section
IHF
Factor
Rate
Section
Input
control
30—15K
75j,
Sec
Hz
1
K
30—15K
Channel (400KHz)
dBf
and
45
at
45
at
Modulation
50%/i
A-202
Section
average
distortion
headroom
power
headroom
power
load
Overload
factor
20-20K
I.M.D
I.M.D(19KHz+2OKHz)at2OW
Hz
(15K
Response,
Response
I
mpedance
Sensitivity
Overload
(20—20K
Response
Noise
to
With
(a)
With
(b)
impedance
Sensitivity
Noise
to
input
Response,
range
control
filter
HeightxWidth
65
d8f
and
1
KHz
100
6KHz
50%
identified
amplifier
power
at
at8ohm/4
at
at8ohm/4
rating
Recovery
50
at
Hz
From
(60Hz
Sine+
20-20K
Range
Resistance/Capacitance
K
Hz)
(1
20Hz/iKHz/20K
at
Hz)
and
Accuracy
A
Ratio
phono
short-circuit
Resistance/Capacitance
*For
Ratio,
signal
50Hz
at
range
at
Turn
Slope
quieting
Mono/Stereo
S/N
Hz
Hz
dBf
65d8f
Mono/Stereo
Hz
Mono/Stereo
Mono/Stereo
by
an
measurement
output
ohm
8
ohm/2
ohm
8
ohm/2
Time
Hz
(Ref.
8
250m
7KHz,
+
Hz
3.18K
Hz
±
3dB
*For
I.M.D
2OHz—2OKHz
Weighted
cartridge
input
1
Watt
out/For
A—Weighted
20—20
K
Hz
10K
Over
frequency
(dB/octave)
Depth
x
(mm)
dBf)
asterisk
at
ohm
ohm)
W
to
4:1)
Square
(From
1
Watt
+30dB
at
connected
Hz
Mono/Stereo
are
ohm
8
ohm
20W
From
Wave)
out/20
Hz
20
*Ref
Ref 20
(From
takeninaccordance
standard.
250mW
20W
at
IN)
Watt
level
Ref
Ref
out
out
Watt
Normal
Hz
to
out
iOmV/*Ref
lOmV
out
IN)
Lab.
input
Watt
1
20—20K
Watt
both
20W
with
channel
5mV
the
driven
1
.8V
3.5V/45V
75dB/7OdB
±0.5dB
±0.5dB
42dB
32dB
62dB
1.5dB
60dB
50dB
75dB
70dB
55dB
0.2%/0.3%
0.2%/0.3%
0.3%/0.4%
0.3%/0.4%
3501V
30dB
45dB
40dB
>
20W
<0.02%
+1.5dB
t/42W
28W/37
+3dB
40t/58W/72W
+1.7dB
Sec
<lji
>
50
Sec
i8V/t
>55
<0.02%
<0.02%
<.1102%
<0.02%
±
0.5dB
80dB
10dB
7dB
x
Hz
±0.5dB
OOpF
5OmV
420
x
10—70K
47K/100pF
0.5mV/2.5mV
27mV/270mV/2V
<0.02%
within
8OdB/75dB
84dB
2OKW1
3OmV/1
>
>110dB
Infinite
±0.5dB
±
±
15Hz
12
1SOVA
7.5Kg
120
240
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DIAGRAM
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GREEN
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Sw-i
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IF
AMP
LEVEL
DET
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-
I.F
T
QUADRATURE
DETECTOR
LEVEL
DET
MUTE
DRIVE
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NING
j
I
AFC
AMP
DRIVER
LED
AUDIO
AMP
MUTE
DRIVE
FM
MUTE
SW-i
AMP
DE—
EMPHASSIS
NETWORK
PLL
DECODER
BUFFER
AM
P
LOW
FILTER
PASS
COMP
DE—
EMPHASSIS
NETWORK
POWER
AMP
TERE)
SUPPLY
DIViDER
LE
SECTiON
SEDNDARY
ANT
7020
ANT
zZ
BLOCK
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RF
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AMP
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(,4)
9
-
.
DRIVER
STRENGH
SIGNAL
NC
PH
0
L
AUX
PLAY
TAPE
REC
EC
R
TAPE
PLAY
AUX
PHONO
LED
DINJACK
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SPEAKER
SPEAKER
TERMINAL
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BR
A
SW
0
3
1
Section
AM
AM
RF
2.
AM
.
IF
—
1
—
2
—
3
FM
ALIGNMENT:
Connection
Hot
sideofSG
Outputthrough
200
antenna
terminal
Hot
output
200
antenna
on
side
PF
rear
to
trimmer
(TP1)
of
through
EXT
to
terminal
panel
AM
PF
ALIGNMENT:
SG
AM
1
2.
3.
1.
2.
3.
Selector
.
AC
Monitor
AM
Carrier
455KHz
600KHz
1400KHz
Selector
line
AC
Monitor
voltage
line
SG
Repeat
Switch
voltage
output
ALIGNMENT
switch
output
Freq.
Step
in
AM
rated
at
REC
at
Modulation
30%Mod
400Hz
30%Mod.
400Hz
30%
400Hz
-
1
and
FM
in
rated
at
REC
at
position
voltage
OUT
Mod.
Step
position
voltage
OUT
(TUNER)
Setting
Point
interference
600KHz
1400KHz
2
Dial
non-
of
Indicator
VTVM
or
Oscilloscope
Adjustment
Point
T302
and
T303
-
T301
Antenna
TC-2
TC-4
and
and
Bar
Adjust
for
Maximum
output
3.
Section
MPX
pilot
Separa-
tion
FM
MPX
Step
1
2
1
2
ALIGNMENT
SG
FM
—
98MHz
98MHz
Same
as
.
1
FM
SG
2.
antenna
Stereo
SG
V
19KHz
10%
L-R
L+R,
90%
10%l9KHzpilot
only
L
19KHz
10%
R
only
FM
ALIGNMENT
is
external
terminal
Pilot
pilot
moduloted
on
the
Dial
Setting
Pointof
no
signal
received
98MHz
•
98MHz
98MHz
1
rear
3.
2.
STEREO
by
through
panel
Indicator
Connect
frequency
counter
through
100K2toTP10
Connect
VTVMor
Oscilloscope
REC
A
to
Connect
VTVM
Oscilloscope
REC
L
to
FM
and
dumy
connected
antenna.
SG
FM
Adjustment
VR2O1
—
VR2O1
VR202
to
3OOz
Adjust
19KHz±
30Hz
Stereo
light
LED
Minimum
output
for
OUT
or
VR202
Minimum
output
(I
0
OUT
Section
FM
FM
RF
FM
Mono
D
istor-
tion
FM
Mute
IF
—
1
-
2
-
3
Connect
-
FM300ohm
2
antenna
—
on
through
1
antenna.
2
3
4
Connetion
the
rear
—
to
terminal
panel
FM
dumy
FM
Carrier
SG
Freq.
—
90MHz
106MHz
Repeat
98MHz
Repeat
Selector
Adjust
98MHz
Increase
If
full
Modulation
—
Step
IF
FM
Switch
attunuator
FM
output
audio
—
—
100%Mod.
400Hz
1
Step
and
100%Mod.
400Hz
FM
and
FM
in
of
100%Mod
400Hz
output
SG
cannot
2
MONO
Muting
FM
4dB
Dial
Setting
Point
non-
interference
90MHz
106MHz
J
98MHz
[
DISTORTION
Position
for
antenna
SG
98MHz
more
be
got
of
get
to
repeat
Indicator
Tuning
of
Meter
Set
VTVM
or
Oscilloscope
Lstortion
Meter
Step
1
input
5dB
VTVM
or
Oscilloscope
full
audio
2.
1
.
Step
1
output
3.
Adjustment
TiOl
(Discri,
IFI
primary
L-1
TC-1
TC-3
TiOl
side
upper
VR1O1
A)
Adjust
for
Center
Indication
Maximum
Output
Minimum
Distortion
Output
disappear
just
IDLE
.
1
2.
3.
4.
5.
6.
7.
DC
1.
2.
3.
4.
5.
6.
OFF-SET
3
4
CURRENT
the
minimum
volume
DC
minutes
5
Set
Connect
shouldbeset
K
ohm
1
Insert
insert
After
If
reading
the
3OmV
and
the
If
reading
3OmV
and
ALIGNMENT
minutes
5
the
Connect
volume
switch
DC
Set
Speaker
100-300mV
readings
If
the
reading
If
the
reading
meter
ALIGNMENT
control
milli-voitmeter
30—lOOmV
for
carbon
ohm.
1
K
were
6OmV.
were
6OmV.
minimum
control
should
milli-voltmeter
scaledeflection.
full
were
over
is
zero.
is
pre-heating
minimum
at
resistor
reading
the
if
than
less
than
more
pre-heating
minimum
at
set
be
±5OmV,
within
the
rang
is
across
full
in
3OmV
6OmV
“A”
to
to
of
Repeat
If
there
slightly
equal.
are
necessary.
position.
R660
scale
parallel
meter
of
then
necessary
is
position.
position.
“speaker
the
positive
The
then
±5OmV
1
and
Step
excessive
an
is
VR202
adjust
ALIGNMENT
for
right
deflection.
with
R648
were
between300mV
value
the
value
the
then
A”
inputof
the
alignment
then
adjust
Step
so
channel
(right
of
of
terminal
the
is
VR6O1
2
difference
the
that
(AUDIO)
and
channel)
RX1
or
or
RX1
of
each
metershould
completed.
(for
between
level
across
and
and
RX2
RX2
left
of
R659
R647
6OmV,then
should
should
channel.
connected
be
channel)
leakfree
signal
for
(left
be
be
The
and
effect
leakage
left
channel.
channel).
alignment
the
reduced
increase
meter
to
VR602
both
of
both
of
the
till
the
till
sensitivity
red
the
(for
channels
channels
meter
The
completed.
is
reading
reading
shouldbeset
(+)
speaker
right
channel)
sensitivity
between
is
between
is
terminal.
tiH
.
for
‘‘V
the
/1
ALIGNMENT
DIAGRAM
INSIDE
&
VIEW
()
0
P.C.B.
-
z
VR2O1
TiQi
TC2
PARTS
LOCATION—i
.*
1
ii’,,’
..J.
VR6O
A
RX1
R659
—
Li
VRGQ2
SPEAKER—
-
TC1
i
1.
PHONO
POWER
2.
PREAMPLIFIER.
AMPLIFIER
DRIVING
STAGE
10
4.
t
5
REGULATOR
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