Nagra E - Page 20

: 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 ava ilable. 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"' .