Service manual

-
Special Points
for
ihc ACCUTRON
Repairmnn
1. Removing
or Re-
placing Hands
2. Replacing Slem
The ACCUTRON movement,
br-ing
completely different from conventional
watch
movements, requires different techniques in its repair.
Otherwise,
it may be damaged
by improper
procedures
on the part
of the repairman. For example,
turning the hands
or the gear train
fin
either direction) with
the hack
lever disengaged, will damage
the
index wheel teeth or the index and pawl fingers The repairman's
attention
is
called to the following special points:
Always pull crown out [setting position) before touching the
hands for any reason.
As with
convrnlionul watches,
the stem should preferably be pulled "out" [setting
position)
before
loosening the setting lever screw to remove the stem. In
replacing
lhestem.il it in pushed in, beyond 1 In- point of engagement
with the pin on the setting
lever, the hunk levi-miny
btdopEHttd
In this
bnrtftt
t
turning
the crown will dam-
age the indexing mechanism. For thin reason, do nol push the item in beyond the
point where the stum groove may be engaged
by
the netting lever
pin. before tight-
ening the Betting lever screw.
3.
Index Wheel
The teeth on
the index
wheel
will not
wear
away in normal use. nor can they be
damaged
as
u result of any accident, when
the movemont is enclosed in its caw
(with
the crystal inl.iU]. The index wheel can only be damaged by improper handling
on
the pad of
the repairman. If
It
is suspected that the teeth
on the
index
wheel have
been damaged,
the moat practical solution ts to replace
it.
since visual
examination
will rarely d Induse the damage because
of the size of these tiny teeth.
4. Electrical
Contact
5.
Circuit
6. Magnetism
7.
Magnets
Partially
Demagnetized
8. Adjustment
of
Indexing
Mechanism
Make a habit
of cleaning the cell strop, which can
be done
efficiently
with an
eraser,
and
wiping any
while adherent
material,
if present, from the Power
Cell.
Such material may (sometime?] "push" the
cell
strap
away from the Power
Cell
and
thereby
break
elect rlcul contact In such instances removing
the residue, particularly
on
the underside of the
cell utrnp will prevent a latent problem in this
regard,
i I .
ice
ul elei i-i.
.i| i.-.t equipment in proi rdurcs uthi'i
than UMM
:.-i mmm-mied.
should be avoided.
In
p.irin
ular. circuit elements can
be
damaged
by the use of an
nhinmeter
for testing ihe circuit.
Never demiigiicli/.e an ACCUTRON movement
or
expose
It to
high-strength magnetic
fields (permanent magnets, lor example).
Diagnosis procedures
in
the preceding
servicing instructions have not covered the
identification oT (rouble
caused by
demagnetized
tuning fork magnets, for reasons
of
simplified
I
ion. Experience has shown that such trouble is very rare. If the move-
ment
current
h within the "OK" area of (he scale
on
the
Test
Set. the magnets arc
satisfactorily mngnvli/.ed
If the tuning
fork
magnets
have lost most of their magnetism, the tuning fork
will
fall
to
vibrate
and
the
Test Set will
Endicall I
very high current-normally interpreted
as due to a faulty electronic circuit. If
(he
magnets have
lost
only
a portion of their
magnetism, the tuning fork
may vibrate but the Test Set will indicate
that the cur-
rent is above the "OK" area of the scale In each
of
these instances,
if an
excessively
high
current (and/or
failure
of the tuning
fork to
vibrate) cannot
be
corrected
by
replacing the complete coll assembly—
try
substituting
a different tuning fork.
If the
tuning fork magnets have been demagnetized—the tuning fork assembly must
be returned to Dnlova for rcmagnetizing.
It is
always
good practice to check
the
adjustment of the indexing mechanism after
replacing the dial and hands. This is because the adjustment
of
the indexing mechan-
ism can change as » result of the slightest turning of the center second pinion
when
the hand is applied.
14