NAD 705 User manual

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705
RECEIVER

CONTENTS
Page
4

Service Instruction
5

Specifications
6-7

Rear/Front
Panel
8

Remote ControlTransmitter
9

TunerAdjustment
Points
10

MainAdjustment
Points
11-12

Instrumentation
ConnectionDiagram
13-14

Adjustment Procedure
15-16

Main Schematic
Diagram
17-18

MainPCB Layout
19-20

TunerSchematic Diagram
21-22

Tuner & Front PCB
Layout
23-24

Front Schematic
Diagram
25-26

IC Block Diagram
27-28

Wiring Diagram (A)
29-30

Wiring Diagram
(B)
31-32

ExplodedView
33-34

Exploded
ViewParts List
35-47

Electrical
Parts List
48

Troubleshooting
Guide
49

Packing Diagram
50

PackingList
51

Notes

TO
REMOVE TOP
COVER
Service Instructions
1 . Remove 4 screws (A) from the left and right sides of the top cover .
(See
figure :[)
2 . Remove
S screws (B) from the rear panel . (See figure
II)
3 .
Top cover can
now be removed .

SPECIFICATIONS
NAD 705 STEREO RECEIVER
Standard Test Conditions
Reference Output : 1 .OW Into 8 ohmLoad
AM Antenna : Firsthand Input
FM Antenna : 75 ohm Balanced
FM Standard Signal : 1 kHz, 75 kHz Deviation At 98 MHz
AM TUNER SECTION
Tuning Range 522 kHz-1611 kHz
(520 kHz-1610 kHz)
Intermediate Frequency Sensitivity
450
kHz
20dB Quieting Sensitivity
.
5uV
IF Rejection
35dB
S/N Ratio 1 .OmV Input
50dB
T .H.D . 1 .OmV Input
0 .3Z
AM Stop Sensitivity (At 1000 kHz)
50dB
FM TUNER
SECTION
TuningRange 88 MHz-108MHz
Intermediate Frequency
10 .7
MHz
50dB Quieting Sensitivity . 1 .4mV
IF Rejection 90dB
S/N Ratio 1mV Input 75 kHz DEV . 80dB
MPX Separation (At 1 kHz) 50dB
MPX S/N Ratio 1mV 77dB
FM Stop Sensitivity (At 98 MHz) 30dB
PRE-AMPLIFIER SECTION
Sensitivity At 1 kHz Output=lV 180mV
Frequency
Response OdB
Loudness
Control (20 Hz) +12dB
Volume=30dB (20 kHz) +4dB
Base 1 Boost
(50
Hz)
+9 .5dB
Cut
(50
Hz)
. -9.5dB
Boost (10 kHz) +7 .OdB
Midrange Cut
(10
kHz)
. -7.OdB
POWER AMPLIFIER SECTION
RatedT .H .D .
O .O1Z
Channel Separation (At
10 kHz) 70dB
Sensitivity At 1 kHz For
40WOutput 1 .05V
Frequency Response
20 Hz +odB/-1 .OdB
50-20 kHz 0±0 .5dB
S/N
Ratio
1W Output A-WTD . -102dB
Damping Factor
At 50 Hz, output=lW 70
0
.032
T .H.D .
PowerOutputAt 8 ohmLoad 44W
PHYSICAL SPECIFICATIONS
Width x Height x Depth 42x9
.5x28 .5 cm
16 .5x3 .7xll .2 inch
Net Weight
6kg (13 .2 lbs)
Supply Voltage
AC 230V, 50Hz (For UK, VDE,
SAA VERSION)
AC 115V, 60Hz (For UL Version)

REAR PANELCONNECTIONS
WARNING : TO PREVENT FIRE OR ELECTRIC
SHOCK, DO
NOT EXPOSE THIS APPLIANCE
TO RAIN OR MOISTURE .
L
R
PR
NO
G N
FM 750

AM

G
AN T ENNA I
MULTI
VIDEO

TAPE 1

TAPE 2

ROOM

PRE

MAIN
PRONO CO SOUND AUX IN OUT IN OUT OUT OUT
IN
L
R
MIMI
OEM
10 12
The lightning flash with
arrowhead .
within
an equilateral
triangle, is intended to alert the user of the presence of
unnsulated dangerousvoltage within the
products enclo
sure : that may be of sufficient magnitude to constitute a
risk of electric shock to persons
The exclamation point within an equilateral triangle
is intended
to alert the user of the
presence of important operating and
maintenance (servicing) Instructions in the literature
accompanying the appliance
REAR PANEL CONNECTIONS
1 . AM ANTENNA TERMINALS .

9 . TAPE 2 IN/OUT .
2 . FM ANTENNA INPUT .

10 . MULTI-ROOM OUTPUT .
3 . PHONO GROUND .

11 . PREAMP OUT/MAIN IN .
4 . PHONO INPUT .

12 . NAD LINK IN/OUT .
5 . CD INPUT .

13 . SOFTCLIPPING .
6 . VIDEO SOUND INPUT .

14 . "A" SPEAKERTERMINALS .
7 .
AUX (AUXILIARY
INPUT) .

15 . "B" SPEAKERTERMINALS .
8 .
TAPE
1 IN/OUT .

16 . AC POWERCORD .
17 . AC OUTLETS
16
OEM
A
N +
OUT
SOFT
. .
NAD
CLIPPING
ON OFF
0M
yyyy
nlalaln
B
IN
III

FRONT PANEL
FRONT PANEL CONTROLS
1 . POWER .
8 . AM/FM SELECT .
2 . PHONES .
9 .
STORE
PRESET .
3 .
A/B SPEAKERSELECTOR .
10 . TUNING MODE .
4 . BASS . 11
. LISTEN (CHOOSE INPUT FOR LISTENING)
5 . TREBLE . 12
. RECORD (CHOOSE INPUT FOR RECORDING)
6 . BALANCE .
13 . MONO .
7 . UP/DOWNTUNING .
14 . LOUDNESSCOMPENSATION .
15 . VOLUME .
16 . DISPLAY .

REMOTE
CONTROL
TRANSMITTER
20 . Stop .
21 . << (Scan Back) .
22 . >> (Scan Forward) .
23 . CD
.
Selects
the receiver's CD input for listening .
24 . Next Disc . Selects the next disc in a CD changer .
25 . 1« (Skip
Back)
.
26 . >>I (Skip Forward) .
27 . Play/Pause .
CD PLAYER CONTROLS
The following buttons operate the corresponding functions
on certain NAD compact disc players .
BATTERIES .
Batteries must be installed before the remote control can
be used . In the future,
if
the receiver does not respond to
remote commands, the batteries may be weak and should be
replaced . The unit requires two 1 .5-volt AA-size (or R6)
penlight
cells .
Alkaline cells are recommended, for maximum
operating life .
To open the battery compartment, press the
small
release
lever between the ribbed areas on the back of the handset .
When installing fresh AA cells, take care to orient them as
shown
on the
diagram within the compartment .
REMOTECONTROL
Since the 705 remote is a multi-product
controller, its
buttons are arranged
by product category .
RECEIVER
CONTROLS
1 . Power .

This button
duplicates the function
of the green
Power
On/Off button on the front
of the receiver . Press
to
switch on the power .
Press again to switch off
the power .
leaving
the receiver in Standby
mode .
2 . Speakers A
. Press to engage or
disengage the A"
speakers .
3 .
Speakers B . Press to engage
or disengage the B
speakers .
4 .
Mute . Press to shut off the
sound temporarily . when
you
want to answer
the telephone for example . (A
little sound may
still be audible .) Press
MUTE again to rec'nre the
sound to its
previous
volume level .
5 . Preset Up/Down .
Skips to the ne~[ higher
or lower
numbered preset station .
6 . Search Up/Down
. Auto-seek tuning ; scans up
or down in
frequency and stops at the
next strong station .
7 . Tune Up/Down
. Tunes up or down in
frequency by small
steps . These buttons
also alter the preset number when
you
are storing
frequencies in the presets
.
8 . Volume Up/Down .
These buttons activate a small
motor
to rotate the receiver's Volume
control .
9 . Numeric
Keypad (0 to 9) . Press these
buttons to enter a
preset number or a tuning
frequency Then press ENTER
to
tell the
receiver that you have completed
your selection . The
tuning logic recognizes
two-digit entries as preset
numbers
and
3 to 5 digit numbers as
broadcast frequencies . If the entry
is invalid (e .g . a
preset number above 39) . the
tuned frequency
will
not change .
10 . Enter .
Press this button to complete
a numeric keypad
entry .
11 . Input Select
(FM, AM,
Video, Phono, Aux, Tape 1,
Tape2,CD) . These white
buttons select the input for
listening
TAPE
RECORDERCONTROLS
These buttons
operate the corresponding functions
on
certain NAD
tape recorders .
12 . Stop .
13 . Rec (Recording) .
14 .
Tape 2 . Selects the receiver's
Tape 2 input for listening .
15 . Tape 1 . Selects
the receiver's Tape 1 input for
listening .
16 .
<<
(Rewind) .
17 . >> (Fast
Forward) .
18 . Pause .
19 .
Play .

TC404
T
T406
me
T407
Fo - 1
TP3
O
TUNER ADJUSTMENT POINTS
T408
T409
T403
10
Wl
T402
SFR402
p

FL 40S
O
TP2
0
O
O
TP1
(VT)
(GNO)
OTP4
T404
OTP5
T401
Figure 1
D
077

TP8
(TUNING)

O
L402
IC403
TC405
SF R403
E)

Amplifier Section
1 . Power outputoffset adjustment
a . At open load, DC meter connected
speaker switch to "A" position .
b . Adjust SFR101,let the reading as
c . Adjust SFR102,let the reading as
b .
c .
d .
e .
At open load,DC meter
Adjust SFR103,let the
At open load,DC meter
Adjust SFR104,let the
MAIN ADJUSTMENT POINTS
Figure 2 .
to speaker terminal A,
0+-25mV .(L-channel) . (Fig .
2)
0+-25mV .(R-channel) .
(Fig . 2)
2 . QuiesentCurrent Adjustment
a . Allow at least 3 minutes burn in before performing this adjustment .
connected to CN-15 base . (Fig . 2)
reading as 4 .4mV . (I=20mA,+-5mA),(L-channel) (Fig . 11)
connected to CN-14 base . (Fig 2)
reading as 4 .4mV . (I=20mA,+-5mA), (L-channel) (Fig . 11)

SPEAKER TERMINAL A
Figure 5
D
Figure 6
Figure 7
INSTRUMENTATION
CONNECTIONDIAGRAM
Figure 3
AM
STANDARD
SIGNAL GEN
.

SCOPE
TAPE 1 OUT

2
0 00
0 0

00
SET
P
FM STANDARD SIGNAL
GEN
100.7M
0000
DC METER

OC METER
+T
00o
00

0 0

00
TAPE
2
OUT
n
+
SET
AM ANT
IN
-FM ANT IN
FREQUENCY
COUNTER

FM /AM STANDARD
SIGNAL GEN VTVM
TAPE 2 OUT
SET
D
SCOPE
FM ANT IN
00
00
4
n
00
00
Figure 8

INSTRUMENTATION
CONNECTION DIAGRAM (Cont)
SIGNAL GEN
.
DC METER
O O
oa
TP1
TP2 SET
TAPE 2 OUT
Figure 12
DISTORTION METER
D
FM ANT
IN
SET
DC METER
Figure 11
AM/FM S
.G .
Figure
10

A : AM SECTION
1 . V .C .O .
ADJUSTMENT .
A .
MEASURE THE VOLTAGEBETWEEN TP7 AND TP4 (GROUND) . (FIG 4) .
B . SELECT AM MODE,
AND SET THE UNITUNDER TEST TO 520 KHZ (UL,
CSA) . (522 KHZ UK, AY, EU) .
C . ADJUST T406
UNTIL THE VOLTAGEBETWEEN TP7 AND TP4 IS IN THE
RANGE 0 .9 V TO
1 .1
V .
D . SET THE UNIT
UNDER TEST TO 1610 KHZ (UL, CSA)
(1611
KHZ
UK, AY, EU) .
CHECKTHAT THE VOLTAGEBETWEEN TP4
AND TP7
IS IN
THE RANGE
7 .35 V TO 7 .65 V .
2 . SENSITIVITY ADJUSTMENT .
A . CONNECT THE UNIT UNDER TEST AS SHOWN IN FIG . 5 . MAKE SURE
THAT THE SIGNAL GENERATOR IS CONNECTED VIA A 22P CAPACITOR .
B . SET THE SIGNAL
GENERATOR
AND UNIT UNDER
TEST TO
600 KHZ
(UL, CSA) (603
KHZ UK, AY,
EU), 30dBUv
.
C . ADJUST T405 FOR MAXIMUM
OUTPUT
LEVEL .
D . SET THE SIGNAL GENERATOR AND UNIT UNDER
TEST TO 1400KHZ
(UL, CSA) (1404 KHZ UK, AY, EU) .
E . ADJUST TC404 FOR MAXIMUM OUTPUT .
3 . IF TRACKING
ADJUSTMENT PROCEDURE
A . USING THE TEST SET-UP DESCRIBED ABOVE (FIG
. 5) SET
THE SIGNAL
GENERATOR AND UNIT UNDERTEST TO
600 KHZ (UL, CSA)
(603
KHZ UK,
AY, EU), 30dBUv .
B .
ADJUST T407 FOR MAXIMUM OUTPUT .
B : FM SECTION .
1 . V .C .O
.
ADJUSTMENT .
A . CONNECT A
DC
VOLTMETER
TO TP7
AND TP4 (GND)
(FIG .
4) .
B . SET THE UNIT UNDER TEST TO
87 .5
MHZ
FM
MODE .
C .
ADJUST L402 UNTILTHE
VOLTAGE MEASURED IS
IN
THE RANGE
3 .0 V TO 3 .1 V .
D . SET THE
UNIT UNDER TEST TO 108 MHZ . CHECK THE VOLTAGE MEASURED
IS IN
THE RANGE
22 V TO 25 V .
2 . 7 .2 MHZ REFERENCE FREQUENCY
ADJUSTMENT .
A . CONNECT A FREQUENCY COUNTER
TO TP5 (FM OSC)
AND GROUND
(FIG 7) .
B . SET THE UNIT UNDER TEST TO
90
MHZ
FM MODE
.
C . ADJUST TC405 FOR A MEASUREDFREQUENCY
OF 100 .7 MHZ
+/-
3HZ .

3 . SENSITIVITY ADJUSTMENT
4 . IF TRACKING .
A . SET THE SIGNAL
60 dBuV .
B . MEASURE THE
C . ADJUST T408
D . MONITOR THE
E . ADJUST T409
F . REPEATFROM
ACHIEVED .
5 . SIGNAL METERADJUSTMENT .
6 . SEPARATION ADJUSTMENT .
ADJUSTMENT PROCEDURE (Cant .)
A . SET THE SIGNAL GENERATOR AND UNIT UNDER TEST TO 98MHZFM MODE .
CONNECT THE SIGNAL GENERATOR TO THE FM INPUTJACK (FIG . 6) .
SET THE
SIGNAL
GENERATOR OUTPUT TO 6dBuV, 1 KHZ MODULATION .
B . CONNECT AN OSCILLOSCOPE TO TAPE 2 OUTPUT .
C . ADJUST 7401, T402, T403 FOR MAXIMUM OUTPUT . REDUCETHE SIGNAL
GENERATOR OUTPUTLEVEL IF NECESSARY .
GENERATOR AND UNIT UNDER TEST TO 98MHZ FM
MODE,
VOLTAGEBETWEEN TP1 AND TP2 .
(FIG 10) .
UNTIL
THE VOLTAGE IS IN THE RANGE -50mV TO +50mV .
DISTORTION FROM THE SIGNALAT TAPE
2 (FIG 10) .
FOR DISTORTIONUNDER
0 .15% .
(C) ABOVE UNTILTHE
OPTIMUM DISTORTION HAS BEEN
A . SET THE SIGNAL GENERATOR AND UNIT UNDER
TEST TO 98MHZ FM MODE,
60 dBuV .
B . ADJUST SFR402 UNTIL THE LAST SEGMENT
OF THE SIGNAL METER JUST
LIGHTS UP .
A . SET THE SIGNAL GENERATOR AND UNIT UNDER
TEST TO .98MHZ FM MODE,
60 dBuV, LEFT ONLY MODULATION .
B . MONITOR THE OUT OF THE RIGHT CHANNEL
TAPE
2 .
(FIG 8)
C . ADJUSTSFR403 FOR MINIMUM
SIGNAL .