NAD 314 User manual

SERVICE SAFETY PRECAUTIONS (UL)
1. Use exact replacement parts for critical locations marked “ /!\\”
2. Return lead dress to original position and re-install protective covers.
3. Before returning to customer, test for shock hazard; use either mothod A or B:
A. Leakage test “cold”:
1. Unplug the AC cord; turn power switch ON.
2. Connect one lead of High Voltage Insulation Tester to both prongs of the 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 the AC outlet: do not use isolation transformer.
2. Connect one lead of the 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.
314
STEREO
INTEGRATED
SERVICE MANUAL
314
STEREO INTEGRATED
om
——
LL
=
o.
=
=f
AMPLIFIER
_

Replacing the fuses
This symbol located near the fuse indicates that the fuse used is fast operating
type. For continued protection against fire hazard, replace with same type fuse. For
ae
SERVICE SAFETY PRECAUTIONS
fuse rating refer to the marking adjacent to the symbol.
Reference No
F801-F802*AH
F801-F802*C,B
F803-F804*AH
F803-F804*C,B
F901-F902*AH
F901-F902*C,B
Part Number
N51003130-1A
N51003130-1B
N51005030-1A
N51005030-1B
N51002510-1C
N51002510-1B
Description
Fuse 3.15A 125V Time Leg LBC (UL/CSA)
Fuse 3.15A 250V Time Leg HBC (SEMKO)
Fuse 5A 125V Time Leg LBC (UL/CSA)
Fuse 5A 250V Time Leg HBC (SEMKO)
Fuse 250mA 250V Time Leg LBC (UL/CSA)
Fuse 250mA 250V Time Leg LBC (SEMKO)
NOTE :
- <*AH >: USA, CANADIAN MODEL ONLY.
<*B >: UK MODEL ONLY.
<*C > : EUROPEAN MODEL ONLY.
2. Safety-check out
(Only U.S.A. model)
After correcting the original service problem perform the following safety check before releasing
the set to the customer.
Connect the insulating-resistance tester between the plug of power supply cord and the screw on
the back panel.
Specifications : 3.8 Mohm+10% at 500V.

CONTENTS
DESCRIPTION
PAGE
SPECIFICATIONS.
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WIRING
DIAGRAM
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7-8
DISASSEMBLY
INSTRUCTIONS
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9
ALIGNMENT
PROCEDURE
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PCB
LAYOUT
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11-12
SCHEMATIC
DIAGRAM
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EXPLODED
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19
EXPLODED
VIEW
PARTS
LIST.
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20-21
ELECTRICAL
PARTS
LIST
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22-25
PACKING
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26
SPECIFICATIONS
POWER AMPLIFIER SECTION
CONTINUOUS AVERAGE POWER
OUTPUT INTO 8 OHMS
(Min. power per channel, 20 Hz - 20 kHz, both
channels driven, with no more than rated
distortion)
Rated Distortion
THD (20 Hz - 20 kHz)
Clipping power
(Maximum continuous power per channel).
IHF dynamic headroom at 8 ohms
IHF dynamic power
(Maximum short term power per channel)
8 ohms:
4 ohms:
2 ohms:
Slew rate
Damping factor
(ref. 8 ohms 50 Hz)
Input Impedance
Input sensitivity (for rated output into 8 ohms)
Voltage gain
Frequency response 20 Hz - 20 kHz
Signal / Noise ratio, A-weighted
THD
(Total Harmonic Distortion, 20 Hz - 20 kHz,
from 250 mW to rated output)
SMPTE I.M.
(Intermodulation Distortion, 60 Hz + 7 kHz, 4:1,
from 250 mW to rated output)
IHF I.M.
(CCIF IM.Distortion, 19 + 20 kHz at rated output)
Net Weight
Shipping Weight
Dimensions
35 W (15.5 dBW)
0.03%
42 W
+5.5 dB
120 W (21 dBW)
160 W (22 dBW)
200 W (23 dBW)
> 20 V/ usec
> 100
R= 18 kohms
C = 560 pF
0.97 +0.06 V
x17 (24.6 dB)
+0.3 dB
- 3 dB at 3 Hz/ 70 kHz
100 dB ref. 1 W
115 dB ref. 35 W
< 0.03%
< 0.03%
< 0.03%
6.9 kg (15.2 Ib)
8 kg (17.6 Ib)
435mm x 110mm x 310mm
(WxHxD)

2>REAMPLIFIER SECTION
2HONO INPUT
nput impedance (R and C)
nput sensitivity (ref. rated power, 1 kHz)
nput overload at 20 Hz / kHz / 20 kHz
THD (20 Hz - 20 kHz) and IM dist.
RIAA accuracy
Signal / Nosie ratio
‘A-weighted with cartridge connected)
LINE LEVEL INPUTS
‘CD, Video, Auxiliary, Tuner, Tape)
MM: 47 kohms + 200pF
MM: 2.5 +0.3 mV
MM: 22 mV / 220 mV / 2.0 V
0.03% at 5 mV input
+ 0.5 dB
MM: 76 GB ref. 5 mV
REAR PANEL / FRONT PANEL VIEW
FRONT PANEL
Stereo integrated Amplifier 314
TONE TREBLE
DEFEAT , ‘
o©M
1. POWER 7. BALANCE
nput impedance (R and C) 20 kohms + 500 pF 2. PHONES 8. TAPE 1 MONITOR
sitive
3.
EXTRA
SPEAKERS
9.
INPUT
SELECTOR
(TAPE
2,
TUNER,
AUX,
input sensitivity (ref. rated power) 170 +10 mV 4 BASS VIDEO, CD, PHONO)
: 5. TONE DEFEAT 10. VOLUME
Viaximum
input
signal
>
10V
6.
TREBLE
11.
POWER
INDICATOR
Signal/ Noise ratio, A-weighted 88 dB ref. 1 W
+0.3
dB
(tone
defeat
on)
and
it
poses
a
hazard
to
anyone
removing
the
cover
to
gain
instruction
manual
and
its
warnings
for
proper
operation
of
the
oe
access
to
the
interior
of
the
unit.
Only
qualified
service
per-
unit.
+0.5
dB
(tone
defeat
off)
sonnel should make any such attempt.
1
03.5
dB
ref.
rated
power
The
graphic
symbol
of
a
lightning
flash
with
an
arrow
point
within
a
The
graphic
symbol
of
an
exclamation
point
within
an
equilateral
tri-
triangle
signifies
that
there
is
dangerous
voltage
within
the
unit
angle
warns a
user
of
the
device
that
it
is
necessary
to
refer
to
the
=requency
response,
20
Hz
-
20
kHz
THD, SMPTE IM, IHF IM and TIM< 0.01% at 5 V out
LINE LEVEL OUTPUTS
REAR PANEL CONNECTIONS
Preamp output impedance 220 ohms
Tape output impedance Source Z + 2 kohms
eadphones output impedance 220 ohms
Viaximum output level preamp-out: >12V
tape-out: >10V SOUND AUX TUNER
headphones-out:
> 10 V into 600 ohms
> 500 mV into 8 ohms
CONTROLS
Treble + 7 dB at 10 kHz
Bass + 10 dB at 50 Hz
Infrasonic
filter
-3
dB
at
10
Hz
1.
AC
LINE
CORD
CD
INPUT
12
tav
8.
db / octave 2, AC OUTLET (ONLY IN 120V MODEL) 9. VIDEO SOUND INPUT
3. SPEAKER TERMINALS “A” 10. AUXILIARY INPUT
4. SPEAKER TERMINAL ‘B” 11. TUNER INPUT
5, SOFT CLIPPING 12. TAPE 2 INPUT/OUTPUT
6. PHONO GROUND 13. TAPE 1 INPUT/OUTPUT
7. PHONO INPUT 14. PREAMP OUT, MAIN IN

WIRING DIAGRAM
FOR C. & B1 VERSION FOR AH VERSION
AC OUTLET
LEo2 CLIP2
0905 0906 j 1
—S — ma an
mC [ [fem CC Torrance
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a
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C135
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ey
BALANCE
TREBLE
TONE’
BASS
x
LED
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EXTRA
PHONES
POWER
SW
POWER
SW
SPEAKERS

DISASSEMBLY INSTRUCTIONS
1. Remove machine screws M4.0 x 6.0 (@) to @) from the side panels.
Remove tapping screw 3.0 x 8.0 ©) from the back panel.
Refer to Figure No. 1.
Figure No. 1.
Figure No. 2.
2.
Pull both sides of the TOP COVER slightly outwards and tilt approximately, 35° and
then remove in the direction as shown in Figure No. 2.
ALIGNMENT PROCEDURES
INITIAL ADJUSTMENT (No load connected)
A. OUTPUT OFFSET VOLTAGE
1. Connect a DC Millivoltmeter to L Channel speaker output terminals.
2. Turn unit “ON” and adjust RV301 (10 kohms) to get a reading of OV +10 mV.
3. Connect the DC Millivoltmeter to R Channel speaker output terminals and adjust
RV302 (10 kohms) to get a reading of OV +10 mV.
B. IDLING CURRENT
1. Connect a DC Millivoltmeter to TP301 and TP303 and adjust VR303 (1 kohms)
for 5.7 — 6.4 mV reading on meter.
2. Connect a DC Millivoltmeter to TP302 and TP304 and adjust VR304 (1 kohms)
for 5.7 — 6.4 mV reading on meter.
3. Leave power “ON” for minimum of 5 minutes, and check 1 and 2 for correct reading.
FINAL ADJUSTMENT
VR 304
RIGHT IDLING CURRENT ADJ.
RV 302
RIGHT OFFSET VOLTAGE ADJ.
TP 304
MEASURES RIGHT IDLING CURRENT
TP 302
MEASURES RIGHT IDLING CURRENT
TP 303
MEASURES LEFT IDLING CURRENT
TP 301
MEASURES LEFT IDLING CURRENT
V 301
LEFT OFFSET VOLTAGE ADJ.
Vv
LEFT IDLING CURRENT ADJ.
$s wD
8 w
Repeat procedure A and B for offset voltage and idling current alignment
respectively.

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TAPE 2 C172 MF - METAL FILM 2%.
R190 ter oT, AA; sa lgs FP - FLAMEPROOF 5%.
ieee CERAMIC - WIREWOUND IN CERAMIC CASE 5%.
2. RESISTORS WITH " #" ARE ELEVATED FROM PCB.
ume aren 3. ALL CERAMIC CAPACITOR, UNLESS OTHERWISE SPECIFIED, ARE 50V, 5%.
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HEADPHONE
SPEAKER
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SPEAKER
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NOTE.
1. RESISTORS ARE CARBON FILM 1/4W 5% UNLESS SPECIFIED.
MF - METAL FILM 2%.
FP - FLAMEPROOF 5%.
CERAMIC - WIREWOUND IN CERAMIC CASE 5%.
2. RESISTORS WITH " #" ARE ELEVATED FROM PCB.
3. ALL CERAMIC CAPACITOR, UNLESS OTHERWISE SPECIFIED, ARE 50V, 20%.
4, COMPONENT VALUES WITH " x " ARE FOR C, B AND B1 VERSIONS.
SEE VERSION DATA FOR AH VERSION.
VERSION DATA.
LOCATION NUMBER AH C/B/B1
R359, R360 0.22 2w CERAMIC 0.22 3W CERAMIC
16

POWER SUPPLY
POWER SUPPLY
D801
1N5402
fears
|
MAINS
SWITCH
230V VERSION
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C803
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A 1N5402
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D804 MAINS SWITCH
1N5402 120V VERSION
SWITCHED
AC OUTLET *
UNSWITCHED
Q901
R903
AC
OUTLET
*
2SD600 10 1WFP# +73V
56
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ae
be!
F901
9 4003 4
C914
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1/2WF
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47/80
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5
7
100
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426 0 D907 R907 20% C901
C912
27V
c904
D902
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100/50 47/80 1N4003
D908
=
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C909
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CORDSET
*
47/80
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*
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LN,
TO
POWER
AMP.
<BB>
VERSION
DATA.
NOTE.
LOCATION
NUMBER
AH
C/B/B1
1.
RESISTORS
ARE
CARBON
FILM
1/4W
5%
UNLESS
SPECIFIED.
J1
-
AC
CORDEST
A\
UL
-
1
POLARIZED
CEE-7/BS1363-3A/AS-3112
MF
- METAL
FILM
2%.
J2-ACOUTLET
/\
DUAL
POLARIZED
NIL
FP
- FLAMEPROOF
5%.
F801,
F802
A\
T3
.
15A
125V
UL/CSA
T3
.
15A
HBC
250V
SEMKO
Se
RE
Or
NE
IN
CE
MIE
aoe
a
2
2.
RESISTORS
WITH
" #"
ARE
ELEVATED
FROM
PCB.
F803,
F804
/\
T5A
.
125V
UL/CSA
T5A
.
HBC
250V
SEMKO
.
ey
Beewnh
~)
“sete
R917,
R918
180
1W
FP
180
1W/2W
F
SEE
VERSION
DATA
FOR
AH
VERSION.
4. COMPONENTS WITH "/\" ARE SAFETY CRITICAL PARTS.
17
18