NAD 5120 User manual
SERVICE
MANUAL
MODEL
BELT-DRIVE
TURNTABLE
NAD
5120
CONTENTS
OPERATING
CONTROLS
AND
FEATURES:
Figure
1:
Front
view
Figure
2:
Back
view
Figure
3:
Tonearm
Figure
4:
Tonearm
features
SPECIFICATIONS
DISASSEMBLY
ALIGNMENT
Figure
5:
Disassembly
of
case
top
(plinth)
Figure
6:
Intornal
parts
and
foatures
Figure
7:
Electrical
dagrary
Figure
8:
Pickup
canrridge
wiring
diagram
Figure
9:
Exploded
view,
parts
identification
MECHANICAL
AND
ELECTRICAL
PARTS
LIST
PAGE
112
1B
&15
SFRVICF
MANUAL
FIGURE
1
FRONT
VIEW
Dust
cover
Center
hole
adapter
Tonearm
Hinge
Motor
Drive
Transit
Main
Rubber
Hinge
Pilot
pulley
belt
screw
Blater
platter
fight
dise
mat
Nap
5120
3
SERVICE
MANUAL
FIGURE
3
TONEARM
Pivot
Counterweight
—
Cueing
Cueing
Tonearm
Antiskating
height
post
rest
post
screw
FIGURE
4
TONEARM
FEATURES
NAD
5120
SPECIFICATIONS
NOTE:
All
numbers
in
brackets
refer
to
paris’
positions
NAD
5120
SEMI-AUTOMATIC
called-out
on
diagrams,
and
to
the
complete
Parts
List
BELT
DRIVE
TURNTABLE
ineluded
in
this
manual.
1.00
EQUIPMENT
DISASSEMBLY
TURNTABLE
1.
Disconnect
power
cord.
Drive
system
Precision
neoprene
belt
drive
2.
Pull
the
dust
cover
[64]
upwards
out
of
the
hinges.
Motor
‘Synchroncus
motor
(960
rpm.
3,
Pullthe
tonearm
out
of
the
connector.
with
60
Hz
power,
$00
rpm
4.
Remove
the
3
screws
[105]
fastening
the
case
top
at
50
Hz)
[65]
that
are
accessible
after
lifting
off
the
adapter
‘Speeds
93.3.and
45.1
rpm
[61],
the
rubber
mat
[60]
and
the
top
platter
[69].
Speed
accuracy
+05%
5.
Lean
both
thumbs
on
the
bottom
case
[1],
and
by
Wow
and
flutter
0.07%
DIN
peak
pulling
the
case
top
with
the
other
fingers,
release
0.04%
WRMS
“it
gradually.
Signal-to-noise
ratio
~70
dB
(DIN
B
weighted),
6.
Remove
retaining
fing
[108]
from
the
transport
(rumble)
—43
dB
(DIN
A
unweighted)
‘serew.
Unserew
the
transport
nut
[37].
‘Suspension
syste
Platter
and
tonearm
rigidly
7.
Using
tweezers,
release
the
spring
[54]
out
of
the
mounted
on
cubshasele suepencion
on
the
chassis
floating
on
high-compliance
8.
Take
off
the
belt
[57]
from
the
bottom
platter.
springs.
Suspension
resonance
Below
4
Hz
TONEARM
Features
Fiat,
flexible,
inter
statically
balanced
tonearm
with
Dynamic
Vibration
Absorber.
Operation:
Semi-automatic
(automatic
tft
‘and
stop
at
end
of
record).
Length
27.8.om
(10%¥/s
in.)
total
longth
20.8
cm
(B¥
in),
pivot
to
stylus
Effective
mass
6
grams
Overhang
19.4
mm
(¥ainch)
Offset
angle
26°
Lateral
tracking
error
Zero
ai
R=
63.6
and
119.1
rim
Maximum
tracking
error
0.18%em.
(0.4*7inch)
Dynamic
Vibration
Spring-suspended
counter
Absorber
weight
with
viscous
damping
Cartridge
weight
40
8
grams
with
counter-
weight
in
normal
position;
2
to
4
grams
with
counter-
weiant
assembly
reversed
Vertical
tracking
foree
0
to
3
grams
(010.30
milliNewtons)
Antiskating
range
0.75to
3
grams
(75
to
30
mN)
Cable
capacitance:
150
pF
DIMENSIONS
Width:
42
cm.
(16¥ein.)
Height
10.5
cm.
(4%
in)
Depth
(including
knob
35.4.0m.
(14in.)
‘and
cover
hinges)
Net
weight
Sk.
(11
Ib)
‘Shipping
weight
6.5kg.
(14
ID.
50Z)
NAD'5120
5
9,
Pull
out
the
bottom
platter
[58]
from
the
bearing
[14],
10,
Unsolder
five
fine
flexible
wires
from
the
bearing
assembly
[33]
from
lugs
[51]
placed
on
the
right
side
of
the
bottom
case.
In
some
versians
tha
wires
are
connected
{to
a
5-pin
DIN
socket
[StA],
instead
of
to
terminals.
11.
Take
off
the
connecting
shaft
[38]
after
pushing
the
chassis
slighty
backwards.
12,
Pull
the
chassis
assembly
[1]
out
of
the
rubber
cushions
[36]
on
three
springs
[34]
which
are
fastened
on
the
bottom
case
[1]
When
assembling
the
equipment
reverse
the
above
procedure.
3URE
5
DISASSEMBLY
OF
CASE
TOP
(PLINTH)
SERVICE
MANUAL
FIGURE
6
INTERNAL
PARTS
AND
FEATURES:
BAA
}
-
ae!
ee
ee
i
YH
Ss
|
REZ
al
|
to]
1
;
&
ie
2.00
OPERATIONS
ON
THE
CHASSIS
1.
Removing
the
tonearm
bearing
assembly:
Re-
lease
the
screw
[103]
in
the
cutout
of
the
bottom
art
and
pull
the
bearing
assombly
out
of
the
bearing.
Slide
the
rod
[92]
out
of
the
suspension.
2.
Removing
the
connector:
Loosen
one
of
the
pivot
screws
[68]
to
set
the
connector
[67]
free.
Check
if
the
flexible
wires
soldered
to
the
pins
are
not
broken
or
disconnected.
The
wires
are
fixed
between
terminals
by
a
rubber
insert.
3.
How
to
re-install
connector:
4,
to
assistin
holding
the
socket
(671,
insert
@
spare
4-pin
male
DIN
plug.
b.
putthe
connector
(67] into
the
bearing
assembly
[33]
So
that
the
triangle
mark
faces
the
tonearm
rest
[23].
¢.
hold
the
connector
centered
and
lean
it
bby
one
tip
to
the
pit
of
the
pivot
screw
[68].
.
tighten
the
second
screw
[68]
until
just
snug,
©.
loosen
either
screw
[68]
approximately
90°.
f.
secure
both
screws
[68] with
nail
polish
(lacquer).
g.
if
the
connector
[67]
is
not
centered,
adjust
its
Position
by
both
pivot
screws
[86].
When
prop-
erly
adjusted,
the
connector
should
move
treely
back
and
forth
in
the
beering,
but
with
as
little
lateral
motion
as
possible.
The
flexible
connec-
‘or
wires
must
be
secured
between
the
temi-
nals
by
a
rubber
insert
and
faced
towards
the
bottom
opening
where
they
should
pass
through
freely.
The
wires
must
not
interfere
with
arm
holder
rotation
or
movement
of
the
connector.
‘4.
Lubrication
of
the
bearings:
The
platter
and
tonearm
bearings
are
self-lubricated,
se
they
should
not
require
any
regular
maintenance.
necessary
both
platter
and
tonearm
bearings
can
be
lubricated
with
a
small
amount
of
fine
machine
oil.
e
SERVICE
MANUAL
3.00
FUNCTION
CHECKING
1,
Tonearm
lifter
[43]
and
[44]:
The
stylus
should
drop
on
the
record
grooves
from
the
lifted
position
within
1.50.7
seconds,
If
drops
faster,
add
more
silicon
oil
to
the
inside
surface
of
the
lifter.
Itit
drops
slower,
remove
some
of
the
oll.
After
any
operation
on
lifter
move
it
slightly
up
and
down
and
tum
it
several
times
in
order
to
distrib-
Ute
silicon
oll
uniformly
and
to
ensure
perfect
lifter
operation..
‘The
height
of
the
tonearm
lifter
is
adjustable
to
compensate
for
different
cartridge
body
heights.
Ifa
cartridge
has
been
installed
in
the
arm.
turn
the
threaded
chaft
in
the
top
of
the
lifter
so
that
the
stylus
tip
is
5
10
7
mm
above
the
record
sur-
face
when
the
arm
is
in
the
raised
position.
2.
Switching-oft:
Switching-off
mechanism
should
not
require
ary
adjustment.
Only
the
starting
posi-
{ion
of
rotating
switching-off
lever
[25]
should
be
checked
25
follows:
Move
the
tonearm
[62]
towards
the
record
center.
‘When
the
distance
between
the
stylus
and
the
spindle
is
approximately
152
mm
(6°)
(ust
before
rim
of
LP
record),
visible
rotation
of
switching-off
lever
[25]
pulled
by
rod
[32] must
be
observed.
‘When
the
stylus
1s
63
mm
(2¥2.)
away
from
the
>
record
center,
the
distance
between
the
stopper
tip
[26]
on
switching-off
lever
and the
platter
axis
should
be
exactly
19
mm
(3').
To
ensure
proper
function
of
the
switching-off
lever
the
stopper
[26]
movement
must
be
absolutely
tree.
.
Antiskating
(side
force
compensation}:
The
antiskating
is
set
during
production
so
that
its
side
force
is
approximately
10%
of
vertical
tracking
force
(VTF),
if
the
same data
are
set
on
the
anti-
skating
(22)
and
VTF
[72]
dals.
The
antiskating
force
should
be
almost
constant
when
moving
the
tonoarm
across
the
record
grooves’
field.
Tha
artiskating
star's
to
operate
at
the
rim
of
30
cm
(12")
clameter
recora
only.
When
the
arm
ts
post
tioned
between
record
and arm
rest,
the
antiskat-
ing
is
out
of
function
and the VTF can
be
set
in
this
place
easily,
without
any
sido
component.
4,
Speed
change:
Chassis
[1]
is to
be
fixed
by
trans-
port
nut
[37],
top
platter
is
removed.
Check
whether
tha
helt
slips
easly
ftom
one
pulley
stage
to
the
other
without
twisting
ar
permanently
touching
the
slider.
5.
Pulley
position:
The
distance
between
the
lower
surface
of
the top
pulley
stage
[11]
or
[12]
and
loner
vertical
part
of
tha
slider
[6]
should
be
0.2-0.3
ram;
sot
it
with
steel
piato
0.25
mm
{Mick
inserted
belweert
those
parts.
If
the
belt
rubs
‘speed
change
slider,
adjust
height
of
pulley
[12]
on
motor
shaft.
6.
Control
start-stop
knob
[42]:
When
the
turntable
isoff,
the
knob
must
be
vertical.
When
playing,
the
mark
line
faces
to
the
right
horizontally.
After
tuming
it
back
about
15° the
knob
retums
slowly
to
off-position,
being
pulled
by
spring
[21].
The
turn-
table
is
then
switched
off
and
the
tonearm
litted,
‘The
knob
return
time
to
the
off-position
should
take
approximately
1
second.
if
less,
some
silicon
oil
should
be
added.
if
the
tonearm
lifts
too
slowly,
7.
Tonearm
cheek:
#f
the
tonearm
will
be
turned
upside-down
for
more than
a
few
minutes,
unscrew
the
DVA
damping
rod
[18]
(the
small
threaded
rod
located
in
the
center
of
the
track-
ing
force
wheel)
until
it
protrudes
at
least
2
mm
(2")
above
the
wheel,
in
ordar
te
coal
the
<i!
chamber
and
prevent
leakage.
Cheek
the
viscous
oil
amount
in
the
damping
chamber
[20].
Tho
levol
should
be:
between
the
marks
0
and
1
on
the
damping
scale
(@)
which
corresponds
to
6mm
height
of
the
damping
oil.
In
case
the
oil
has
leaked
out
it
should
be
refilled
with
NAD
oil,
Part
No;
8AV68600,
or
with
a
univer
sal
one
having
viscosity
180,000
GP
(e.g.
Wacker
‘AK
18000).
The
oil
should
be
refilied
through
the
damping
chamber
aperture
after
unscrewing
the
damping
rod
by
using
a.
common
syringe.
la
cartridge
has
been
installed,
tum
the
tracking
force
wheel
to
balance
the
arm,
and
then
set
the
vertical
tracking
force.
(i
the
white
BVA
turing
‘screw
obstructs
the
motion
of
the
counterweight,
substitute
a
shorter
screw)
If
the
carridge
weighs
less
than
4
grams
and
cannot
be
balanced,
rotate
the
counterweight
assembly
180
degrees.
(Tum
in
the
DVA
tuning
screw,
press,
down
hard
on
tho
tracking
force
wheel
in
order
to
flatten
the
spring
washer
beneath
it.
and
rotate
the
assembIv)
‘Adust
the
Dynamic
Vibration
Absorber
(DVA)
as
described
in
the OVA
Tuning
leaflet,
or
use
ominal
settings
of
10
Hz
for
the
tuning
frequency
and
2
for
the
damping
ratio.
(In
each
case,
align
the
top
of
the
adjusting
screw
with
the
desired
scale
setting.)
Check
the
geometric
alignment
of
the
cartridae
With
respect
to
rotation
and
overhang
(see
cus-
tomer
instruction
manual).
Use
an
alignment
pro-
tractor
to
check
the
offset
angle
of
the
cartridge.
Check
the
connection
of
the
wires
at
the
back
of
the
cartridge
for
a
enug
friction
fit
(crimp
to
tighten
if
necessary)
and
correct
connection
according
to
the
standard
colour
code,
8.
Checking
the
position
of
the
floating
chassis
suspension:
In
operating
position,
when
transport
nut
and
platier
are
released,
and the
record
and
tonearm
are
put
on,
the
vertical
clearance
be-
tween
the
lower
surface
of
the
rubber
mat
[60]
and
the
case
top
[65]
around
the
whole
rim
must
be
3mm
(%")
minimum.
The
horizontal
dearance
between
chassis-parts
and
the
case
top
(65)
should
be
aiso
3
mm.
Vertical
clearance
can.
be
increased
or
reduced
by
inserting
or
removing
washers
[35]
between
rubber
cushions
[36]
and
chassis
holder,
or
by
bending
the
holder
ends
slightly.
9,
Signal-to-nolse
ratio:
Measure
with
the
test
rec-
‘ord
(Dennon
XG
7004)
according
to
DIN-45/544
Standard.
When
using
DIN
A
fiter,
signal-to-noise
ratio
should
be
better
than
~40
dB.
Average
value
is
measured,
and
random
deviations
must
not
exceed
+508.
.
410.
Wow
and
flutter,
speed:
Measure
with
wow
and
flutter
meter
and
test
record
(Dennon
XG
7004).
Maximum
acceptable
eritt
(speed
deviation)
is
(0.5%,
and
wow
and
flutter
maximum
+0.15%
(QIN).
if
more,
check
the
platter
bearing,
belt
and
motor.
Further
instructions
for
settings
and
maintenance
are
pro-
remove
some
silicon
ol
from
the
inner
friction
surface
of
the
brake
[20]
vided
in
the
customer's
manual
(INSTRUCTIONS
FOR
INSTALLATION
AND
OPERATION).
NAD
5120
9
SERVICE
MANUAL,
FIGURE
7
ELECTRICAL
DIAGRAM
9,
10
207
47,48
SYNCHRONOUS
MOTOR.
NEON
LAMP.
POWER
SWITCH
FIGURE
8
PICKUP
CARTRIDGE
WIRING
DIAGRAM
CARTRIDGE
TONEARM
CONNECTOR
AUDIO
SIGNAL
LEAD
RCA
JACKS
UG
L
!
hitelblacld
CHANNEL
Or
!
IR,
CHANNEL
RG
.
oe
>
ae
Te.
Soa
>
—C
rOUND
_
(CHASSIS)
CHASSIS
AD
5120
cd
SERVICE
MANUAL,
iGURE
9
EXPLODED
WIEW/FA
IDENTIFICATION
‘SERVICE
MANUAL
12
PARTS
LIST
A.
BASIC/PRIMARY/SET
B.
FULL
SET
CALLOUT
PART
CALLOUT
PART
NO.
neSCRIPTION
NO.
NO.
DESCRIPTION
‘NO.
7.
SPRING
TAA
781
38
4.
CASE
BOTTOM
PART
BAF
603
040
(Speed
Change)
2
CHASSIS
ASSY
BAF
15.027
8.
EAING
8AA024
000
(Case,
Bottom
Part)
(8mman)
3
HOLDER
‘BAA
664
001
(EUROPE)
8.
SYNCHRONOUS
MOTOR
‘SPJNAD
5120
(Chassie)
(Drive)
220
W50
He
4
CAM
BAA
250036
(USA)
10.
SYNCHRONOUS
MOTOR
‘SPJNAD
5120
(Speed
Change)
(Dive)
120
Vi
Hz
5
WASHER
TAA
064
38
(EUROPE)
11.
PULLEY
SotHz
AA
600
000.01
(Speed
Change)
(Motor)
6
SUDER
BAA
189.006
17,
SPRING
TAA
785
34
(Speed
Change)
(Aut.
Stop
Lever)
(usa)
12
PULLEY
60
Hz
BAA
885
005.02
2.
SPRING
_
BAA
706008
(Wotan
(Control
Shatt)
13,
SLIDER
GUIDE
BAA
261
034
23.
TONEARM
REST
ASSY
BAF
1400008
(Speed
Change)
(Chasse)
V4.
BEARING
HOLDER,
BAF
251017
30.
SPRING
89A
786
25
(Patter,
Tonearm)
(Antiskating)
15.
SLIDER
BAF
248010
31,
RETAINING
RING
TAK
024
00
(Aut,
Stop
Lever)
@
mm
dia)
18.
WASHER
Remnant
33.
TONEARM
BEARING
ASSY
BAF
826
001
(Aut.
Stop
Lever)
(Chassis)
18.
CONTROL
SHAFT
ASSY
SAF
725002
34,
SPRING
9A
791
11
(Chassis)
{Chassis
Support)
19.
BUMPER
‘BAA
663
026
40.
EXTENSION
SHAFT
B
‘BAF
249
000,
(ut.
Stop)
(Conve)
20.
BRAKE
BAA
259
006
41,
SLIDER
BAA
185
042
(Conircl
Shaft)
(Power
Smiich)
22.
CAMASSY
AA
757
000
42.
KNOB
ASSY
SAF
243
017
(Antiskating)
{Coneol
+
Speed
Chengo}
24.
FELT
WASHER
BA
209
02
49.
SPRING
9A
786
16
(Motor-Case)
(Power
Switch)
25.
LEVER
‘BAA
NES
041
57.
BELT
4x08
<
160,
Aut.
Stop)
(rive)
Liste)
26.
STOPPER
BAA
182
007
60,
RUBBER
MAT
89A
221
05
(Aut.
Stop
Lover)
Curniable)
27.
PLASTIC
WASHER
TAA
084
58.
62,
TONEARMM
ASSY,
COMPLETE
8AN
625
010.01
(Ait
Stop
Lever)
(With
Sits
for
Cartridge)
28,
FING
BAA
O17
021
64,
DUST
COVER
89A
696.05
‘(k.
Stop
Lever)
67.
TONEARM
CONNECTOR
ASS¥
=
2WK
"2010
29.
LEVER
BAA
165
040
78.
GOUNTERWEIGHT
ASSY
BAF
942
008
(Artishating)
(Dyneric
Vibration
Absorber)
32,
ROD
BAR
188
009
207.
NEON LAMP
POWER
PG
100-19
LD
‘(Antiskating)
(100%)
33.
WASHER
6AA
068011
(Chassis
Height
Adj)
36.
CUSHION
89842401
(Chassis
Spring)
37.
TRANSPORT
NUT
BAA
035
010
(Ghassis/Case
Bottom)
38.
CONNECTING
SHAFT
BNA
252
009
(Contra)
99,
EXTENSION
SHAFT
A
8AA
260
035,
(Contio)
49.
LIFTER
TUBE
AA
906
045
(Controh
44,
THREAD
ROD:
BAA
010.008
(her
Litter)
45.
CUSHION
(RUBBER)
AA
015
002
(arm
Liter)
46.
SWITCH
HOLDER
BAA
668
018
(Powe
Switch)
47,
SIMITCH
CONTACT
‘BAF
468.005,
(Power)
48,
SIVITCH
CONTACT
‘BAF
468 004
(Power)
NAD
5120
a
‘SERVIGE
MANUAL
FIGURE
2
BACK
VIEW
cables:
screw
platter
cord
a
mat
tal
NAD
5120
SERVICE
MANUAL
6B.
FULL
SET
CALLOUT
(usa)
(sa)
NAD
5120,
No.
st.
51a,
5.
101.
102.
103.
PARTS
LIST
PART
CALLOUT
DESCRIPTION
No.
NO.
DESCRIPTION
BRACKET
BAA
I86
005
4104,
SCREW,
TAPPING
(Power
Switch)
3x18
LUG
TERMINAL
7AA
080
06
105.
SCREW,
TAPPING
(Power)
35*
18
DIN
SOGKET,
PIN,
108.
WASHER
RUBBER
BUSHING
CSN
6338811
'so43
{5,5
mm
dia)
S5x2
107.
WASHER
(Case
Bottor)
soaz
CONTACT
WASHER
BAK.
063
011
108
E-RING
(Bottom
Prater)
Isog2
SPRING
AA
785 007
109,
E-RING
(Chassis)
Iso40
‘AC
CORD
‘SAF
615
002.
110,
NUT
(Power)—Madet
02
so
‘AG
CORD
BAF
635
09.01
111,
MACHINE
SCREW
(Power)
—Medal
03
1S02%5
AG
CORD
oF
2071822
‘SCREWDRIVER
BAF
940.000
aeerines
oh
FINGER
LIFT
‘BAABEA
ON
IAL
CORD
TAK
762.00
Te
Aree
ovale
DVAFREQUENCYSCREW
8
AAO7400102
SIGNAL
GORD
Satachent!
DVAFREQUENCYSCREW
8
AAO74.001.03.
(fo
Ampiier)
18059
ise
dpe
DVAFREQUENCYSCREW
—
8
AA
074
001.08
BOTTOM
PLATTER
ASSY
BAF
478
003
Boele
(Tumtabie)
|.
TOP
PLATTER
AA
776
007
(Turntable)
ADAPTOR
45
RPM
BAA
250
007
Turntable)
HINGE
SAF
45200301
(Oust
Cove
—No
Mark
6.00
ban
PARTS/ELECTRICAL
HINGE
AF
45200302
cmt
bat
(Oust
Cover}—
white
Mark
RO:
DESCATION.
Ls
HINGE
BAF
45200309
(USE
ONLY
SPECIFIED
PARTS)
(Oust
Cover)—Red
Mark
201.
RESISTOR
0,30
Mo.o,t25W
CASE
TOP
(PLINTH)
8AF
699
018
Modot
01,00,
04
PIVOT
SCREW
89071
01
202,
RESISTOR
0,12
Mo10,
1250
(Tonearm
Beering)
Model
02
‘TONEARM
P¢
BOARD
@AF1I900101
(USA)
209,
CAPACITOR
GPF
AS415
3900
pr/400
(With
Sioss
for
Cartridge)
Model
01,
02,
03
VAC
SETTING
WHEEL
AAA
2aR
O14
208,
CAPACITOR
Te
210
‘2200
pFr1000
V
(UIF
=
Verteal
Tracking
Fores)
Modal
04
MAGHINE
SCREW
205,
CAPACITOR
GL
700-8424
0,22
uFi260V
1so4xe
Modal
01,
03,04
MACHINE
SCREW
(USA)
208.
CAPACITOR
TGL
200.8424
68
,FHEOV
180.8510
Model
02
MACHINE
SCREW
207,
NEON
LAMP
PG
100-19LD
Isoaxte
100
*
SERVICE
MAMUAL
NAD
ELECTRONICS
BOSTON/LONDON
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5
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