INAGRA~
INSTRUCTION
MANUAL
KUDELSKI
SA
.1033
CHESEAUX
SWITZERLAND
-----
-
---------------
NAGRA
E
PORTABLE
ANALOGUE
AUDIO
TAPE RECORDER
INSTRUCTION
MANUAL
(KSA
code
No. 20 02002 1
51
)
Kudelsl<i
SA
NAGRA
TIIpEI
Reeoolll<
Manufacture<
OH-l033 Cheseau. I
SWITZE
RLA
ND
pI'ooe (021) 731 21 21
lelel< A59 302
nBgI
ch
telefa><
(02;1)731 41
55
May 1919
ed
ition
N/lGI1/1, KUD€L8KI,
N
~OP
lLO
T
,
NEOPILOTTON
N/l
GI1/1
81/1TIC,
NII
GRI\FIIX
a,er
egi
ster
'"
j,
aoo
_
"",
rk•.properly
01
KUO
H8K1
8
./1
NAORA Tape
Rscor
,,"'
M
anu
t
actur
...
NAGRA I KUDELSKI certifies
that this instrumenl ""as thomughjy inspected and lesled
prkJr
to
leaving our factory and
is in
accor<la.r<:e
""ilh
1I1e
data{jiven in
II>e
accompanying lest sheel.
We
lIW1r8ntoe
1I1e
products ot our o""n manutactu
'e
against
""y
defact arising
fwm
faulty
mal"\Ufacl
ure
lor a
peIiod
of ona year from the date of delivery. This gu. r. nt.... covers lhe ,epair
ot
<:onfkmad def....,ls
or.
~
n....,..,ssa
ry. the repleo:amenl
ot
the fauny parts. excluding " othar indemnilies.
All
troi!t>l
co51s~
as wall as customs duty and other possible charges,
.'"
at 1he customer's espense.
Our lIUlifanlee remains valid
.,
lhe a
.a
nt of eme'9!"'CYrapairs or modificalions being
made
by lha
u_
Ho..av.... ""a
r_I'\Ia
lhe 'ighl
lO
;,w
Dic
a the
ClIS
tomer for any damage caused by an unqualifi9d person
or a lalse manoeuvre by the op8fator.
We decline any ras
fXI
nsitmry klr
an
~
and all damages '6sultitlg,
li
rOCll
y or
indorecll
y, kom lhe use ot oor
prO
lJuClS.
Otller products sokl by KUDELSKI
SA
ara
c~
red
by \flO gUllfanlee d auses
of
Ill";
, raspective
manufaclurers. Wa decline any respoosi
rnl
ity lor damaqes 'esulling from the use of meee products.
Wa
'e_va
lha rig
hl
to moddy me P'oduct and I <)I"
lila
specilications wilhout notice.
CONTROLS
TABLE OF CONTENTS
CHAPTER 1
CHAPTER 2
CHAPTER 3
PREPARATION
1,1. P
owor
supply
1.2. Thr
Nd
i
r>g
the rape
'.
3. Sp
e""
and reels
OPERATION
2.1. Meter reading
2.2.
Po
te ntiometer pos<liooing
2.3. sa
fety
eaten
2.4. Main IIJnctioo selector
2.5. Con
nec
tions
2.6. Rocordi"ll
2.7. Playback
MAINTENANCE
Page 1
Page 3
Pag
" 11
3.1. Batlef'es
3.2. Cloooirlg
the magn
et
ic heads
3.3. Access to tho interior
01
the Nagre E
3.4 SimJlkllault finding
CHAPTER 4
CA
LI
BRATION
Page
11
4.1.
Ca
tibfot
"'"
of the playback chain
4.2. CaI
Obra
tion of the record chain
CHAPTER 5
CHAPTER 6
NAGRA E-L WITH PILOT
5.1. DeSct,pU
OI1
5.2. RecOfdi
"ll
5 3 Playback
5,4, AdjuslmOOI
5.5.
Nagra
E-L bl
oc\<
diagram
SP
ECIFICATIONS
SynopbC
doa
gram
Coo!igurat
or
Pa
lJ"
21
Page 27
P
ag
e 33
"'"
"
NAGRA
E
CONTROLS
, ,
3
, ,
e
r a
9
,
a
a
•
,
e
,
e
,
tu
l
a~
le
rlSioo rol
le<
Supply
'ee
l
Era
""
head
Star
"l
i_
roller w
rt
h strDboOC<lp<!
fl
ecor
ding
...
ad
Play
bac
k Mead
Pi""t>-wheel
T
...
...
""
,""I
Pi
ncl>-w
hee
l cont,,,"
"'
er
Ri
gh
i 1
""
0;
00
roller
ra
..
rs
re
"
"
ta
eu
ar
"
Gal
vano<oe
le,
Ca
l;Jora
t
ion
$C'_
V
Q
I~
line
i
npu
t
Mic"'lj'hooe fX'Ie
mi<>meter
L_
inpLII& playbaCk
POI
eoriomel",
Tape-<l
ir<lCl
s"otch
l<>ud>peaker . " j
le1l
AA
a
on
luncMns
..,
1e<
1
",
HeadptJonc oulpul
Ban
<l<
Vtesl s...tch
"
tz
33
"
U
no>
inp
ut 1
""
"""
1)
es
Po
we
r pack
c~
'"
"
M..... inpul
as
Power
mOOo
oeIoctor
$Wi
tch
"
So.<
IoclO
ng screw
aa
60><
loc
k;,,\!
SCf
_
"
.o.q.nvnetri<:al
~
""
""lplll
n
M""
l>J)llone
sel0ct0r sWItch
(symmetrical
<>n
option)
Chapter 1
PREPARATION
EIMqo1e. 0/1
~
eels
""
e...
lfllIt
sliding
..-:1'1
26 ill .... .
-....-
~ ~
Turn _
the
NAGRA E
....
.....-
_
30
bI'
.......,;"g
fIoang
sctew$
29
end
32.
f'IIOI
_
1~
D-ty
pe
~
.
IR20) 0'
liIIewl
2fJ D-
Iype
~
eels,
....
.......
direction,
as
indicated on
Ih<I
-.....
01
....
COI'hj)IittmBnI. /I is
~
to place
...
bMIer
.c
aacIl
&nd firs!, and then to insert
the
Olhers in
""-
PI_
bac
k c
O'o'
er
30
inl0 place lacuring it
..
,Ill
1IC.~
a
211
and 32 and lurn 1ha NAGRA e
O\I
a•
.,.
,.
S&1
mein luoctions
seJec10r
10 ' PLAYBACK" or
"RE
COR
O· and ch&ck
volIag&
by
~es8inO
down
'Ball
,
Test
" ,
Wl
lCt1
22
. With
new
cells.
"""""
13
8houId
$hc>w
18 v
ce
ee lower _ . H
II>e
f\lHtdIe
.......
n.
below 11 V.
II>e
~
o
l
l"O"
i.
insu'h;:;erlllo
~
"'"
NAGRA
E-
c
•
•
•
•
•
~.I
pow&!'
supply
'Throw
.-:tl
26
10 'ExIemaI",
The
P<W3AA
E can
also
be
jlOIIo('It8d tIy
IhIo
"'TN
.........
po.-
~
which
ca
....... 10
qlUI
2'S
Pow.
PecIl.
r-
_
~
8S
SO
"g
· Ban. TM1'
$oIoII;fI 22,
.-
01
""'*'
13
......
lI"
10
....
t.- rigIt. n
dag&
so
q:Fd
is
8PP'O"""'-Y
" v.
,."
•
ill
poe'
....
to
c:hecl<
IlwI
vol!aOt
~
ot
....
NAGRA
e
(Ball
. Test
22
)
at
any _ .
no
"""*
w/'IaI:
Iunc1Jon
has
'-"
seIec1
ed
.
"
,
"
1.2. THREADING THE TAPE
1.3. SPEED AND REELS
2
Rele
",
e
pjr>chw
heel 7 by
P<J
ll
ing lorward
ba
~
r
9.
Place
Ih
..
lu~
r
ee
l on
tI>e
1,,
11
and the ..mply
r
~
00 me righl hand sida. Secu re ltiom. Thread
tI>e
taj>e around tensioorollers 1
ar>d
10, and
wOnd
su
ffi
cient lape 00 lhe empty reel. Eng
"!l"
the
pirlctlwh
e<>1
by pushing
leve,
9 hack inle its
crig
inal
pos
lDon
: il should snap sha,ply into plac
...
.
Th8 recorder is
row
ready 10operal...
N6 :
Wh
ao threading the
tape
.
""
sU
'"
thal the oxide
lay
er
laces
lhe heads.
The
rac<>,d
cha,n
01
Ihe
NAGR
A E is
e<Wibra
ted at
t
hEt
laclory w
ittl
a
g
i
~
n
ty
pe
of tape, II anolher
type
of
lape is
10
be
used
, il will
t>e
r'IIlCass
ary
10
re-ca
l.
b<a
l.. lhe machine
'"
exp
lai
ned in Chapter
4,2.
11th..
NA
G
RA
E remains unused lor a long period
01
lime. laver 9 should not be loft in th" rele
ased
posihon as lhe clul
dl
might d..I..,;"ral" and
become t
hEt
S
llU
rco of
noi
sy r
ew<n
ding.
The NAGRA
E is a single-speed re
cord
er
avai
loble
either in 19 cmIs (7
112
ips) or 9.5 cmls
(3.75 ips)
~rsoi
n,
The
",
cord,ng limes gilten below are an indicahon
only and cormspond to 3
5J1
long play l
ape
,
,
"'
.
9 5 cmls
HI emfs
Cover Closed
t27 mm 47 min.
24 m
in,
with
cs
er
178mm
1
"34
min.
47 min_
with OGB 267 mm 2h12 m'n.
moe
min.
standa,d 50
Jl
la
p"
:
Reels
9.5 cmls
19 emfs
Covar closed 127 mm 32
mi
n. 16 min.
wil
h OSET
178 mm
11
h03
min
. 32 min.
wilh OG6 26
7m
m 1h36 n un. 48 min
The
me
ter has
two
gradl.l'll<>d scales. 009 in
"GIIs
and
It\El
other in decibels. " is used
to
<:hed< the
supply voltage, to adjust
It\El
input seosil;"ity. to
eaect a
fOug
h ch
9Ck
of the
c
~cuits
and
10
calibfate Ihe record and playback chains.
M
echan
ical
zero
setti
ng
ay
me
ans
of
adj
ustment
sc'ew
14 Ihe
mod
ulomotar n_ le can
be
moved 10 the lelt
or
10 the right
and
thus positioned exactly at the
beg
inning of the scale.
Bal;lery cheek
LI1W9'
scale. The thick part of the
~
Ie
indOcata"
II>e
mini
mum
and m
e.
imun levels of the oopply
voltage
(with batl9<ies}.
Input
"e
ns
ltlll
ll
y
Uppa.
scale. The
NAGRA
E meter lunetm s
as
a
mod
"'ome
ter, i.e.
~
sllows tho peak value. with
fast use
tme
and intagr
atocl
fall of the recorded
"'9'18
1.
K incOfporateS a memory device
mak
ing it
poss
ible to
,ead
the VSlU9 displayed. As is
cu
S1(l1J1ary
with Vl!'met
ers
, graduation is only
trom
-20
dB 10 +3 ee.
Low9r
scale. The NAGR/\ E is
ocau
ippad
w<
lh its
own checking device. A
1'1008
p1ac9d
in.
KIa
the
'acotd", pormits a quick
dIec~
01
all circu;ls. The
\/Ol
taga rnaasuroo is shown 00 tha
JOOl9
r (sea
Chap'
'''
3.3.).
Ca
litlrallon
of
1
1>8
rec:o
r<klr
UpiXl<
sca
le. This scale is used lor c
albalioo
{soo Chapler 4)
Chapler
2
OPERATION
2.1. METER
REA
DING
S
3
2.2
. POTENTIOMETER POSITIONING
"p
,'j'
"
,h
':'
LIN
E
INP
UT
J
& PLAYBACK
2.3. SAFeTY CATCH
4
The hW NAG
RA
E potentiometers
l(j
and
17 are graduated d
iffe
rent ly.
Potentiometer
16
micropnone
Graduated Irom
16
0 to 71 dB. This
sc
ale
e.
pH!sses the sound lev
....
in dB for a recorded
level of 0 dB. I.e a
32
0 n
WM11
flu
•.
Tho
thick
patt ot the scale
cO
Hesp
<>
nds to t
he
beSl
lIP"
fatiOrllli
la
nge oI lhe micro
ph<l
ne
p'e
a"'ll
lilier.
If sensilillilV must
be increased as tar as belwoon
82
ar>d
71 dB. lhe backgroond noise will nt} klll
gar
be
negli
g<
ble
WIth
....
Specf lO
tape
n
";
se. How&ver.
d se,,,. tlvity must
be
<!&
c,eased to
betw
oon
125
sod
150
dB in order to ,eco,d at 0 dB on the
m<>dulom"'
er, then eeiput signai is too strong. It
is tharelor& necessary either 10 relluce tt
19
si{lflal
lIov
..
by maans of an a
ll
en
""""
, providoo the
microphone
it
se
~
is not saturated.
or
to swifch the
iopul to '" less
s
""
si
~v e
posoIioo
.
Potenti
ometer
17
Un
.. ln
put
& Playba
ck
Graduated trom - 70 to +12 dB. II a
la
pe
record/ld at
0 dB
"",
91
. La. a 320 nWblm ftux, is
played
bad<
with the potootiomrrtar at 0 dB.
rt
will
giv" a nominal signal
01
0.94 V at unbalanced h.....
output 24. The
moduk>met
er will
",
ad 0 dB. " the
pOlentiomal" r is
sal
10 + 12 dB fh" modulomater
w
oll
indicllle 0 dB tor a signal rocorded III
-12
dB.
AS a safety precaution on the NAGRA E. main
lunction selector 20 is equipped with two slotted
bunons. one is red. fhe other
wt>j
te.
During transportafion. : to avoid inadvf!rtent
op<lrat
oon
ot the recorder, it is possibl"
10
lock the
selool
<>r
in STOP position by pressing the wM "
buttoo
and
tU<
ning
~
90" .
Ouri"il playback or editing :
10
avoid accitltmtally
a
w~
~hing
10
r
e
~
or
d
,
it is possible
10
use
Ihe
r
OO
buttoo in the same way.
The
main selector will
tum freely bul
~
WIl
l
be
impos
sob
l.. to
s
w
~ch
it to
~"'
S I I••
20
hils
so
.
p<*bOi
l$ lor !he
k*>-.g
""
......
OS
:
S
ToP
:
p""""""
Sl4'PlJ
dI
.....
edoid
By
"-"'-"II
dtd
aise
:
TEST :
'"
is Mol lor '_
""
00:
........
is
nat
.....-.0.
~
13 lItIOWlIlhe
~
fA
...
s>gNI
thus
maU'lO
c possollla 10
...,....,
...
~
.-;lMIy
.
RE
COR
D : T
I>II
tape
os
•......-.g; C is
JirSl
..
ased
end
lhM
,ocorded.
REFERENCE SIGN
Al
AND CALIBRATIO
N:
Po
..
liol'l allowing the calibration 01 tho r
&ClJr(l
ct>IIin
. (See ChapUII 4.2.).
PLAYBACK :
ll>a
sognal
'-'
• . .
...
I
'*'
a
...
~_
........
car>
be
rwaO&d
II)
trwough
...
buill....
ka
I..
*_ by
"'
- 9
~
19
II)
!he
0-
"4
' •
.,mtd.
~
..
adjusl
ed
by
mean. of poten_
..
17
"Unfl
Input &
~.
p<Mding "
T_
Drncr" .
.....
18 is
on
the
"
One!"
posiboo
~
FAS
T : ltios posi\ioO.
pem'IItI
~
--.I
(
......
I
f I '
ed
) or
last
Ioward
~
9
tIf"9'I9Ild
). In
lui
Iorwilfd. Ihe
11;
'
""
*. II
<IIscOOrIe<:te<
.
1II
.
~
is w ailable
headpfIooes
aulpJt
21.
2.4. MAIN
FUNCT
ION
SLECTD
R
5
:U
. CONNECTIONS
So>"
(:OrlnK\1IO'S
on
bee
SIdes
of !he ,........
d&o
perm
il
1M
use 01 valK)I,l'
ac:c..
soriGs for
........
~'"
Of pI8ytJ¥k.
t.-.
"'PUt
11
(temaIe
Tuc:fIoII
ikloIe
l
e::un.nt
....
I'lpI.t,
IewI
of
...tctl
• q II d
willi
polell!ioo•• •
17
"tile
~
&
~
,"-d<
•.
a....
1oC
...
isCicI :
.......,
-
Ma.
imum
leII
eI
Source impedance
3 ..... kir
OdB
ec
c
140 pA
high.er lhilnl 1«1
Mik"
inpul
12 [XLA :l-poIol
t.l
i~
.
Input, l"v,,1 of which il
Id
jusl"
d b,
0'Ilicr0ph0nG
poItO'llioo"etBf 1
1>
. ThrI '
npul
<:an
be
I$pled
» dilt9ren1
types
ot
mic:ropho
nos
by
......
of slMld'l 33 on
...
......
rsil\e oJ th&
._
0.
.
,
-.
u.~
.
""
."
.•._.
/ ".
_-
~
(-.-
...
.-
....
.
...
.-
-1." ,_ .....
i
- ·_···_·
-.
·
...
,
...
-.
_-
'+.
--._-
,."-
--
.
-
_
._
-
~
-
-
~
..
-
_
._
..
~-
_
.•
_
..
~
-
•
c_
•.
IN<o ' T'"
~lC8
SensiMy
~
rm
oub
it;;oll
l«l
~
-
Seo
_ity
~
...
Sourco
.
,
~"""
ey....,
MOo
"
200
Q
...
.......
-
-
. 12
V.
4 mV
I*'
Jlbar
m.
2
~
mV
bOdB
l32O
"
~)
.. ",V b OdB
(
51
0
~1
1
200
mV
. 12 V, 2 mVp&< llbar
m.
1.26 mV lor 0 dB
(
320
nWbl'm)
2mV101'0
dB
(610 nWbl'mj
ecc
m'
1
0.0
25mVlor
OdB
(320
nVtbm
)
"
mV
bOdB
(5
10
nWb\on
j
1
200
mV
hig/W
~
I
.e
)
10 . 0
0-138 mV Iof 0 dB
(
320
"""'bom)
0.22 mV for0 dB
(510 nlM>m)
100 mV
VoItal)8 line inpul 15 (t:>anaM
pluQ
if
T
he
......
is adjusted by pOI",,!iomeler 17 " lJnIo
Inpul &
1'Iaybeocl<
••
0." V
RM
S lor 0 dB
150
kG
reo
v
0.56 II FlMS lor 50 Q
0." II RUS .... 600 n
.....
-
As"
,••_
ieII
lJnIo
OuIpuIlM
~
plI,ogs
)
Cha
....
......
:
O-
llofVIWS
....
320n
'Nb/m
U
611
RMS
lor 5
'0
nWbl'n
,..s:
It
stw:Ud
boo
~
.......
broIOcMII I\.al _
.t;onda«! i
....,.
3ZO
nWbhn
lor mo
no
'
.....
duI.
;
;,
"'"
....
.
.....
del IS
deI:
,.
ed
......
-......Ho
••
.•
iI-V.-y
D
adjull
ltlii
....
D 510 n'Nblm
bJ
~
"'
'Il
...
~
n ... ,
.f
..
. a
geoe<aror
.
....
impIow>g
..
..
IOJ_
.-
bJ
.. dB,
0I;Jl0cA
as
.,....,
._
ieII
....
~...,
boo
replacAd
toy
a
~
....
0UIPUl
.....
11
1600 G
1.
56
VI600 n
E>
ternal power
SUllllfY
.
Suppty
volI"Il" must
be
l)a
tw
-.
- 10.7
et
-35
II.
AccePl
.b18
flppIe
is
to
.7
V,
7
:iI
.s.
RECORDING
W
ith
mi
cro
pho
ne
"
Co
noact
the m
icro
phDrifl to inpul 12
and
sw
itc
h
33
10
cDf<9POJ'd
to th
...
Iyp9
of mik&
us&<:!;
main
lunc1ion
se/9cID<
20 on TEST, Adj
ust
th8
inpll
l
5Ilnsilivity with pot
...
l1liDm&lef 16. " a headSel is
availabj
e. d is also possib/9 to evajuate the quality
of th8
BOUnd
,ecording
and del&fmine
me
beSI
positioning of me mierophDnll,
Tu
rn
S9
1",,10<
20 to
RECORD
. The lape is
ru
nn
ing. Anything alteildy
'6OOf
dlld on th8 Iap&
will be first erased as d runs across erase head 3.
M th8
headphones
Dulpul
two
lYP8S
of signals
can
00
he
ard. Whllfl "T
ape
-[);,6I'1" swi
lch
is
on
"[);rect". th
...
signal being ,
eoord<o
d
can
be
hea<d;
wh.......s
..
posiOOn
"Tape". th8 signal heard is
....
ady
reoord&d
on the ta
p"
and is ,e
po-OOlJCed
by
the
playback head. Comparison 01 t
he
.... lw<l
signala
peI"fTVls
an
...
. alu800n of th8
QUll
l
ity
of
th8
,,,,,o
rding
.
and
in
pat1iC
ulBf Ilflables
del
9Clion
01
laults,
such
as
difl
on a
head
or
a lape threaded
the wrong
w
Wf
.
H8 :
The
tape
can
be
,ewound
Ieavi"il main
se
lecl
O,
20 on RECORD, but r&leasing WW
ll'
9 :
Howeve"
lihouId th8
tape
accidentally lOuch erase head 3
or
record head 5,
~
w
","d
be
partially ....
ased
With
Mne
input
Connect the signal sou
rce
to the adequa
1El
line
input 11 or 15 <see
Cha
p1ef 2.5.). Selactor 20 on
TES
T
and
adjust th8 sensitiv
ity
with potentio-
met
er
11.
•
To
rucl
a ........dod
tape
.
\IJ
m S8le<:U'
ZO
10
"PLAVBACK". To st
the
ploI\'baC
k laval,
........
18
1O
"
0irecI"
use
lJC*li
illU
••
'. 17. •
18
is
on "T
APF'.
the
pIayf'a'*
..,....
.......
n.
~
.
TN
Iig"lll
read
..
lIIso
av_
at
l
oMdpto
...
0UlPA 21 ......
ill
asy,""Wllli
ical
Ina
00IPUl
2. To
sw*:tI
on Ih9
~
...
b risl
pt
· ,
_
......
1$110"
b
"'Sl::
I
k
•
.,....,.
.
.•
"
••
1 T
..
IO.........,arape~I
Jl
I
h20
on "
PLt
YBACK"
....... I
III
..,..lI
.
n.
it
pm_
it
the
.
ecoo
<l&o
is
eqo
iqlad
_ a
Iloaling
outpuI600
0 , • .• V
...
1
.56
V lopllon),
Wi-.
ma.n
.,
lsc
lOo
on
"PlAV8ACK" and _ II
IllghIIy . sll as
ed
00
It\iII
lh9
Iapo
it
001
~
....
tepO'\8l" can
....
. a miaophot.
~....,
.
TN
tlICOI'<InlI
C*l
lh8n
be
nns""ned
lly
simPY
lully
-.g~
leY
....
9. A
convnen
t
....
r by tlla
.
eportaI
ov.-
ilia
..coning
is at
""
pos.sibIa
by
*"",
hng
pol
~
t
...
s 16 and 11.
Conn
ection
with
otto....eql,llpmenl
..........
the
NAGRA
E
is
so.oppIied
I<Om
an
ATN
its
....
Is
Mi"
lIfIPI'd
10 th8I
cl
...
.......
. II
it
ia
~
an
~
fie
-..-.
cl
"""""" ,. alio
Wi
oow;W
10Ihat
0I1h9
mains
" "
<1IiSftOA""'"
cl
..
aogNiI can
prto9IliI"lIIa
...
_,,
:
'-*
_ cl
....
-"'ing
loop ec t:wmed
the
....
01
the
N.t.GAA
_
not
be
eQClly
III
!he
_
p:*-
........
_
cl
..
..
,
~
.
T "'8V _ due
10 _
~
--...a loop
or
due
III
_ _
n'IIIQO'*Iic
iekla-
e-
it
Iha
-.lh
cl
...
NAGRA
is
cifaetl1
COl
......
1Ud
to
..
_
cl
the
...........
Wi"idI.cIi¥ily
cl
Ihis COO'«:liOi•
......
no!
be
adeq
.
..
. 10 SUW'l'SS
.........
lliIIeo
_o::a
.
nw
.'41
1811
"*'
_
is."
c...-
opnon,
Ill
....
two
poMI"
diedes back4O-back
..
the
c:onntICtion
bel
.M
..
A
TN
_
and
!he mains
__
TN
doodee
do
no!
condUCI below
.....
........,.
I V; trIey
lui
pm!eCIlDn /rom
ItMI
"...,
1""'"
cl
fKlII
do
001
......--....
..
miIMlII
......
.
lJrlIOI1
unale
lr
thio meltlod has
not
\'8l
_ "
iolrOduclld in
V"""""
nalKlnal ,eguta
lO'li'l
S
2.7. PLAVBACK
•
•
.
\..
(,
SX
II
"
..
" "
zt
,
10
AnOlller solulion is to have a differential input on
the
amplifier. ThIs is the case with the DSM
mon
ito
r and, in ge
ne
rel with pr
ot
essio
nal
equipmenrs. Two wires are sutticioot to make ttle
conna<:tion, the eartM
baing Sbepped through ttle
main...
On
the
o!hor hand, in the case
01
ball9ry
opetahon a third earth wire is required.
II the NAGRA E is connected to an unbalanced
ilIf1
pt!;er, the problem
Ca
n
be
minimized by !he
use
01
short earth connections to the amplilier
and
me
ATN; by keepi
nglhe
mains wires of
the
amphfier and
01
the
ATN as parallel
as
possible 10
evoid formation 01 a big lO
op
.
Do not torget that
It>e
microphone input
ot
the
NAGRA E is balanced
and
used as Iina input lor
low94s
between 2.5 and 1200 mV. Thus the
operation is
a1
w
aVS
car,ied our using 3 wi'es, one
connecting
the
earth of
the
equiprn9nr and the
OllI
e<
1\1/
0 transmining Ihe signal. It the source is
unbaIanc.:l,
0fI8
at the inpur wi'as should
be
connected to its earth and thu other
008
to its
actiw
termioal. It
thelwO
oqoipments are already
connected
10a
cornnlOfl
8arth, the first earth wire
ohoukt be cut.
Ri
s.
01
e~
lyte
l
eak
age
Des
pit
e the eIlorts
01
e
el
manulact",
ers, there
always exists a risk
01
laakago
01
the el
9Crol
yta,
espacially
from flat ba\1erias.
Such
a leakage may
cau
se
serious damage 10
lha
NAMA
, aspac
ialy
il
~
is
""pi
In
~ s
carrying
case
wh
dl
/
91
ains the
corrosiv(Iliquid.
Thus
:
il.
lor
any Ioogtll
01
time, you do
not
inWnd
lo
use
yow
NAGRA cn balleries, ,amolia
\ham
.
ff you
PQ
your battaries in a froo:zllf, you
practically stcD
Iheif
seIf·dlscharge.
whan your baIler",s are llal, mmove them
immediately.
~
a leakaga occurs. wash with water. The
NAG
RA
sutlers
much
less from watel' than
1/OnI
the electrolyte 01
too
balleries.
In ","dar 10record and playback, the t
al'"
must
be
in a perfect contact wilh the heads. U
ntoot
tJna
tely,
cartain tapes lose some
01
the ~
oxide which may
then sa
llla
on
the heads. T
he
playback Ih
oo
becomes muffled and the ,ecording distorted.
Fcrtunstely, inspaction
of the haads is
""'y
easy
in the
NAGRA
E. II is sufficient 10 inspocI the
recorder
without the
tapa
. The
ad
ive part
01
the
head is
white and polished like a m
~fO
r;
it black or
bfc>wn
traces
are
llisibla
there
.
~
is
neces
sa
'Y 10
remove them,
II ,s not recomroondoo
10
n.t>
the heads when dry,
they should
be
cteaoad with a piece
01
welled
OOlI
on.
A1coh<.>1
is
good
, but water is accaptsble
t
"",
In urgoot cases the COfnllf cl a hai\dl<"'"Chlel,
wetted with some saliva. can be used. On
It>e
other hand, strong
sot...
ents, tike trichlorethylene
and similar liquids
must
never
be
used, as they
~ausa
the apoxy resins used in the manufacture
otthe haads 10 expalld.
Chapter
3
MAINTENANCE
3.1. BA
TT
ERIES
3.2.
CLEA
NtNG
THE
M
AGNETI
C
HEA
DS
11
3.,. ACCESS TO THE
INURloq
Of'
THE
.......
12
To open Ihe NAGRA E two
Iafoe
~
23
and
21. thould
be
uncIone by •
10'
_ _
pushed
inlo
..
I
......
deo
in
...,.
10 _
!he
1ocII,
n-
...
~
deck
..
"PM
"'"
beong
hingeod
.;0:
........
-tWld
end.
• "
de-.
nol,
~
23
_
27 I
~
more
8I'd
puIh
1>IrOIr. •
"""
......,.._
......
IW
I¥
.
lie
ron
..
bill
"'5idI
8I'd it
..
be
'*
!
...,
kI
~
.,
......
n.
IlUl$
_
yeIaw
bitt
2. rnm long
wiI'I
two
~
sIOI$. The
d'IamIer
sholAd
be
tuned
to.ard$
\IlOI
outsidu of
"'_<lei
Once the
teCOI'
der is open you
WI
~
~\lft
the main
c;rcuit board. Th"
co'CUI1
dl
ag'am
and bag of
spa'a
jllIir'l
~
....
...-.cIama
l th
1hili
baIw>d
the
ba
tl&ry
~,
To
cot
.....
iICC8~
IIO
!he spiOI"1lS
~
is
necess.y 10 lift ItIa
main
CO'cuil
board which is
hngad
IIIOou
its
......
aOga. The
fIo
oot of !he drcuiI
"'*d
II
r;"oo
by
two
~
.
wNcf>
must
be
.-
bel
,,",
"'"
cifcul
tJo.d
can
be
lifted
lCl-
n-
__
..
are Ioc8t-.:I on
power
Iransastor
'-
..
.
at
boIh a<IgiM ol
"-
oin:uI
boowd
. The
righl
hind
dill"'''''
__
~
Ihn:JIqI
..
case
ol
...
,
......
"'"
just
8bow
lIIIi
""-
output
SIlld<f!t
....
Ihe
Ilift _
KftW
OJ
--....
"-<l
up
......
..
<i
...
mKtw\e
~
oroer
10 use
!he
mocl
OO
'i4'
eo
..
. voIlmel'"
laI<
a
from
...
bag
tho bl;ock wire w
oltl
• CQI
....
c.....
ill
one
end
and an insul319d mea........ p<obe at
the
(lth",
. The
COtYl9C1or
should
be
pIugqad
on
to
pilar
No. 21 which is
on
Iha main circuit
boafd
.
on
the
righl
hands
ld",
ir'l
Iir>e
with the
su
pply
sele
clor
·
Pow
","• • you mquir..
the
voUm....., tor coarse
__
""",nlS
only,
1.
1. chec
l<iong
I"
"
S<ip
ply
woIt
age
. it
is
nol
_
SIlty
10 diik:OnnllCl the
oircuiI
oj
...
frlOduIOrMw. • IJ'6MIt
.ccunocy
is
,
equ
ire<l 'emov"
br
id9
1 TB·P
On
Ito.
le
fl
I>indsoda
ol !he
~
.
RernDwIQ
....
lin!<
TB-f>
'
_'
11 !he _
~h
01
Ihe
moduIometer
cin:ult..
n.a...b-e
.
should
W'OU
....
10
......
_ on
'-
<:ircuiIs
•
Iir>I<
Ihould
be
MIld be. Cln
1&0
. The
Pi
' ••
POIa
of
the
......
.
!'IF
OJ
...
"...
......
.......,
10
...
main
earth
<i
l dIo
aold
!he
~
-..red
...
I
JespecI
10
-u,.
As
• _
W'OU
C¥I
"-'
the
inIIINI
~
-..ga
you
..
fird on
...
IirsI
piI;If
whictl
""
I ll'ey ......
_.
ew
to it. This
pilar
OJ
on Iha right
h8I'd
siOO
ol I
..
citcuiI board nalff
10
tnoa
POW
'"
t'ansistor
I'i4a1
......, T
..
voltmeter should road 10 on
the
Ioowet
scale,
i.
l.
- 10 volls DC.
Fu
•••
Tha genel'al
SUP
Ptv
fuse pm'
''''t
s
the
NAGRA
again
st
:
t
he
short-circuits which could be caused,
fo<
example, by I loose pert inside the rooo«Ier.
a ...vllrSlll of
the
supply
..
hic
ll
is
a1ws
ys
poss
ible in csse
01
acc
Ul'¥M.llaIOl"S
with non-
standard
terminals
or in CltS8 of a
....
"""sed
.lf1Ornai
SIljIply
connection. T
he
usa of a
diode in . ...;"s
witllllle
supPy m
lllM
a waste
of
8I'III'9Y
which wooId shorton !llo uSl'llul life
01 tile
be
ll
...
;"
s;
we
prefer
10
ft
a diode in
parallel willl th.. supply wlllch would cooduet
in
case
of
supply
,..
versa!
. and the fuse
would
blo
..
il
tM
co"
..
nl
"""sme
ds
"Ue
r
ously
strong,
TIle
~
a1
fuse is of
the
in-lina sokIered type;
~
is kx:ated n
ear
Sl4'pIy
salado<
•
Pow
er" 26, on
tII& riglll:, inside
IIIe
NAGAI\,
under
tile rhain
circuit
baw
d. TIle rlltOlg
01
tha fuse is 2.5 A: a
splIW
fusa is in
the
bag
of spara parts: be/ore
,aptac;ng clleck witfl a IIo\Imeler thai tile
blown
fuse
IIq
completely malllld i.e. that there is !llo
voltaga at one
01
its ands and nona at tII& otllar.
e attery
fuH
a
TIle batteries of
the
NAGRA E coosiSl of
lll
rea
groups
in series; each
llfflUP
Cf.lfI!ains
four
cells.
n-e
~s
are connected
b'f
wires roo inside
tile
NAGRA
belli
nd
tile
battary
boo. Some
8CCUmUiutors
(nol
our
s) have a thin el(lemal
inslllalion:
~ ~
is damaged th
..
may cause ..
short
-circu~
be
lO'
eM
two groups
01
cells snd
the
currant may easitv reach one hundred amps.
which is sufficient 10 msIt
the
connocting wira: its
insulation will th
an
bum
, producing aotremely
corrosive gas damaging
the
wl\ole
liIptl
recorder.
To avoid this, wa have
iI:\coopora
ted fuses in
the
ballery coolacls, on th.. rigtlt lIandside: a
spa",
I
USEI
is in
the
bag. Commerci
allu
sos may
be
usDd
(bul
ttlIlir
contacts wil
not
be
m8dol
of precious
alloys). Fuse dll1ll is as foIows : diamater 5
mm
.
lengtll 20 mm. fating 2.5 A.
13
:
l.4
, SIMPLE
FAULT
FINDING
Mach
i
ne
c
om
p"t
e
ly
de
ad
Basically lhe
pc_
supply ~ suspect. Press the
swilCh "Ban. Test" Ihe
roaod
l.. should deflllCt
N rt does
not
dllllect at aN, checlc if too baneries
are
finGd
or Ih.. ATN is conn..cIGd. Check ..Iso
w
helh
.... the switch "P
owe
r",
on
the right
handsid.., is irI lhe cooed
position
.
The
ATN may not
b&
powered; its voltage switl;h
may
001
be
in Ihe correct
posibOl'l
Or ilS
lu
oos
may
be
bl
ow
n. Before dismantling the
NAGRA.
try
it first with
anot
h",
ATN III with lh
..
balleries.
" !his is not successful, chock
ee
"",in
fuses,
(
.....
Chap""
3.3.).
If Ihe naedle
OO~
OCIS
bul lass than 10.7 V
charl{l9 tha batteries
N
the
noodle dilllecls
ab<we
10.7 V and
the
recofd.... does
no!
opera1e
.
ll1efe
~ a _
",
us
fau" which requires
9XPII11
allention.
The
electronics operi>le (ampNII.
..
. m
odu
-
1011181.'
,
h.adphon
• •)
but
th
e
motor
d
oe
s
not
'0"'18.
Switch Ihe
mach;""
1<1
fast ,ewind and turn
the
IIII! .
..
1by hand. II th& motor stsrts rt means
lha
t
its colloctor is faulty. It must be repaired but. in
tI>e
meanlim• • it may still continue
1<1
work. n a
.
e,.,,;ca
9tlg;naer is
not
available. cpan the
••
cord
e.
(see
Chap
le
r 3
.3
.).
remo
v.. I
he
sc~
·can
shielding
the
mm
or
and
lry to
cklan
Iha collector with a tis......
s<lake
d
On
alcohol.
Take care 001 to distort or damage th& brushes;
!hey are made
01
p"lICious alloy and are very
e
.pens~
.
The motor" rotales
at
full
s
peQCI
On
playb
a
ck
oron reoordlng.
It may be a
fau
lt
due
1<1
t
he
speed
sta
bil
izar or
tI>e
lachometric head.
Ths
head is near
tt1e
motor
insida
Ihe
bGU
which
goes
10
tt1
e nghl ,eel. Check
that
i1s
wires are
001
broken or that
rt
is net
misplacfld.
The
normal gap betwaen
ee
head and
the tac
!l
c
IJ
""
tric whe&!
~
0.1 mm. i.e. the ticknass
01
e stiff piec(l of
JI'I
P"'
.
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
/
