NAD MONITOR Series User manual

SERVICE
—
MANUAL
~
MONITOR SERIES
3400
INTEGRATED
AMPLIFIER

NAD 3400 SERVICE MANUAL
CONTENTS
sO ON FP WN
18.
23.
Safety Notice
Rear/Front View
Specifications
Remote Control Transmitter
Main Amp, Preamp Alignment
Schematics, Foil Diagrams
Version Voltage
A 120
Al 120
B 240
B1 240
C 220
C1 220
C/S 220
SERVICE SAFETY PRECAUTIONS (UL)
Wiring Diagram
Exploded View
Exploded View Parts List
Electrical Parts List
Country
USA
Canada
UK
Australia
Europe, others
W. Germany
Scandinavia
1.
Use
exact
replacement
parts
for
critical
locations,
marked
“A\”
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.

ATTENTION:
REAR PANEL CONNECTIONS —
1. AC LINE CORD. 8. CAPACITANCE SELECTOR. 15. INFRASONIC FILTER. SS Goce eo
2. AC OUTLETS. 9. TUNER INPUT. 16. SOFT CLIPPING. Serer sens sien our
3. SPEAKERS A. 10. VIDEO SOUND INPUT. 17. BRIDGING. ores
4. SPEAKERS B. 11. CD INPUT. 18. SPEAKER IMPEDANCE.
5. GROUND. 12. TAPE 1 INPUT/OUTPUT.
6. PHONO INPUT. 13. TAPE 2 INPUT/OUTPUT.
7. MM/MC SELECTOR. 14, PREAMP OUT, MAIN IN.
5 4 3
Ln! senmaune 4 OMe A ORIOU 8 MPEDANCE
{—) MONO + enum core A ANoreT @ “C(NORMAL) 80. G8GH)
6
7
8 9
10
11
12
13
14
15
17
16
182
1
uninsulated
“dangerous
voltage”
within
the
product's
enclo-
maintenance
(servicing)
instructions
in
the
literature
sure;
that
may
be
of
sufficient
magnitude
to
constitute
a
accompanying
the
appliance.
The
lightning
flash
with
arrowhead,
within
an
equilateral
The
exclamation
point
within
an
equilateral
triangle
is
intended
(
triangle,
is
intended
to
alert
the
user
of
the
presence
of
to
alert
the
user
of
the
presence
of
important
operating
and
tisk
of
electric
shock
to
persons.
FRONT PANEL CONTROLS
1. POWER. 8. TREBLE. 15. BALANCE.
2. PHONES. 9. TREBLE RANGE. 16. VOLUME.
3. SPEAKERS A/B. 10. TAPE COPY. 17. STATUS INDICATORS.
4. BASS EQ. 11. TAPE 1, TAPE 2.
5. BASS RANGE. 12. INPUT SELECTOR.
6. BASS. 13. MONO.
7. TONE CONTROL BYPASS. 14. LOW LEVEL.
1 17
Monitor Series Stereo Ampiitier 3400
POWER ENVELOPE
2
3°44
~«
5 6
7
8
9
10
11
12 13
14
15 16

SPECIFICATIONS
Note:
Specifications
are
measured
in
accordance
with
EIA
Standard
RS-490
(IHF
A-202).
Measurements
re-
ferenced
to
80
are
taken
with
the
Speaker
Impedance
Selector
set
to
“80
(High).”
Measurements
for
4
and
2
ohms
are
taken
with
the
Impedance
Selector
at
“40
(Normal).”
POWER AMPLIFIER SECTION
STEREO MODE
CONTINUOUS AVERAGE POWER
OUTPUT INTO 8 OHMS
(Min. RMS power per channel, 20Hz-20kHz, both
channels driven, with no more than the rated distortion)
Rated Distortion (THD, 20Hz-20kHz)
Clipping power (maximum
continuous power per channel)
IHF Dynamic Headroom at 8 ohms
IHF Dynamic Power (maximum
short-term power per channel)
Slew Factor
Siew Rate
Damping Factor (ref. 8 ohms, 50 Hz)
THD (Total Harmonic Distortion, 20Hz-20kHz,
from 250mW to rated output)
SMPTE I.M. (Intermodulation Distortion,
60Hz & 7kHz, 4:1, from 250mW to rated output)
IHF I.M. (CCIF IM Distortion, 19 & 20kHz at rated output)
Input Impedance
Input Sensitivity for 1W out/for rated power
Voltage Gain
Frequency Response Lab Input
Signal/Noise Ratio, A-weighted
BRIDGED (MONOPHONIC) MODE
CONTINUOUS AVERAGE POWER
OUTPUT INTO 8 OHMS
(Min. RMS power , 20Hz-20kHz,
with no more than the rated distortion)
IHF Dynamic Headroom at 8 ohms
8 ohms
8 ohms
4 ohms
2 ohms
100 W (20 dBW)
0.03%
130 W
+5.7 dB
370 W
400 W
440 W
>50
>30 V/usec
>100
<0.03%
<0.03%
<0.03%
R = 20k.
C = 600 pF
100mV/1.0V
X28 (29 dB)
3 Hz to 100 kHz
+0, -3dB
98 dB ref. 1W
118 dB ref. 100W
300 W (24.7 dBW)*
+4.3dB

IHF Dynamic Power (maximum short-term 8 ohms
power ) 4 ohms
PREAMPLIFIER SECTION
PHONO INPUT
Input Impedance MM:
MC:
Input Sensitivity (1 kHz) MM:
Mc:
Input Overload at 20 Hz/1kHz/20kHZ MM:
MC:
Signal/Noise Ratio, IHF A-weighted, MM:
with cartridge connected MC:
THD (20Hz-20kHz) and IM distortion
at +30dB level
RIAA Response Accuracy
LINE LEVEL INPUTS (Tuner, CD, Video, Tape)
Input Impedance
Input Sensitivity ref. 1W/rated output
Maximum Input Signal
Signal/Noise Ratio, A-weighted
Frequency Response, 20Hz-20kHz
OUTPUTS
Preamp Output Impedance
Tape Output Impedance
Maximum Output Level
Tape Output Infrasonic Filter
800 W (29 dBW)
880 W (29.4 dBW)
R = 47 kQ, C = 100/200/300 pF
R = 100.9, C = 1000 pF
0.22 mV
0.011 mV
20 mV/180 mV/1.6 mV
0.8 mV/8 mV/80 mV
80 dB ref. 5 mV
78 dB ref. 0.5 mV
<0.04%
+0.5 dB
R = 50k0
C = 250 pF
15 mV/150 mV
10V
96 GB ref. 1W
116 dB ref. 1OOW
+0.3 dB
60020
10002 (buffered)
10V
~—3 dB at 14 Hz
12 dB/octave

CONTROLS
Treble
Bass
Bass Equalization
Infrasonic Filter (switchable)
Audio Muting (low level)
PHYSICAL SPECIFICATIONS
Width x Height x Depth
Net Weight
Shipping Weight
Power Consumption
+12 dB at 3,6 or 12 kHz
+12 dB at 50, 100 or 250 Hz
+3 dB at 60 Hz
+6 dB at 36 Hz
—3 dB at 12 Hz
12 dB/octave
—20 dB
43.5 x 12 x 38.5cm
(17.1 X 4.75 X 15.2 in.)
11 kg (24.25 Ib)
12.6 kg. (27.75 Ib)
50/60 Hz at 110, 220,
or 240 V. 390 VA
Specifications are those in effect at the time of printing. NAD reserves the right to change specifications or de-
sign at any time without notice.
*In some countries local regulations require that bridged 8 ohm power be measured with the speaker
impedance switch in the 4 ohm position resulting in a bridged RMS output of 200W(23dBW).

REMOTE CONTROL TRANSMITTER
STATION SELECTION
CD TRACKS
TAPE LOCATIONS
MODE
SIGNAL
SOURCE
SELECTION
SELECTION
VOLUME
PLAYBACK
CONTROLS
SCHEMATIC
FOR
REFERENCE
ONLY,
TRANSMITTER
NON-REPAIRABLE.
MAIN
AMPLIFIER
ALIGNMENT
IMPORTANT NOTES
1.
Before
adjusting,
remove
input
signal
and
load,
and
set
speaker
impedance
switch
to
8
(HIGH);
reset
to
40
(NORMAL)
when
finished.
:
2.
These
adjustments
are
always
necessary
after
repair
to
main
amplifier.
;
3.
After
repair,
it
is
recommended
to
use
current
limiter
(200-250W
lightbulb)
in
mains
line,
for
initial
turn-on.
A. CENTER VOLTAGE CHECK
1.
Connect
DVM
from
Ground
to
R836,
L
chan
(R886,
R
chan).
2.
Turn
power
on,
and
check
for
reading
of
OV
+100mVDC.
B. IDLE CURRENT ADJUSTMENT
1.
Connect
DVM
from
TP801
to
TP802,
L
chan
(TP851,
TP852
R
chan).
2.
Adjust
R818,
L
chan
(R868,
R
chan)
for
reading
of
14mV
+1mVDC.
Cc. FINAL ADJUSTMENT
1.
Leave
power
on
minimum
5
minutes.
2.
Repeat
center
voltage
check
and
idle
current
adjustment.
PREAMPLIFIER
ALIGNMENT
CHANNEL BALANCE
1.
Feed
1kHz,
100mV
to
CD
input;
connect
AC
VTVM's
to
Pre
Out.
2.
Set
volume
to
maximum,
balance
to
center,
low
level
off.
3.
Adjust
R758
so
that
both
channels
have
same
output
level
+0.25cB.
TP802
TP801
TP852
TP851
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P.C.B. LAYOUT
INPUT/OUTPUT P.C.B. ASS’Y (J030A)
MAINS INPUT P.C.B. ASS’Y
(P034C)
HEADPHONE CONNECTOR POWER SWITCH ASS’Y
ASS'Y
MAIN/CONTROL/SUPPLY P.C.B. ASS'Y (029A) paris
(HOO6B)
BRIDGE SWITCH ASS’Y
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(A) UL 1 23- 1383-0-0
(€, Ci, C/S) 1 23 - 1382-1-0
(8,81) 1 23-1352-2-0
3400-2
COM P.C.B. ASS’Y TACTILE SWITCH ASS’Y
(D017A) (S016A)