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
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