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Identifying
Defective
Coil
Assembly
This procedure
is
intended
to identify
which
coil
assembly
is
defective,
when
a
check
of
ihe
movement
current
results
in a
zero current
reading, indicating
improper
I ii ii
r.
tinning
of
the eJectrunic
circuit.
Note: Mechanical
interference,
caused
by improper adjustment
and/or
any
factor
(such
as
lint}
which
restricts
or
work-loads
the fork
may
result
in
abnormal
Tesl Set readings.
Unless
the
circuit
is
"open"
(current
reads
zero),
it
is
rarely
necessary
to
replace the
cuil
assembly
during
repair
of
ACCUTRON.
I!
the
tuning fork
vibrates,
an
ACCUTRON
problem
is
not
due
to
a
faulty
coil
assembly. Higher than
normal
current or
variable
current are (with very
rare
exception)
al
waya
caused by
other
factors.
Assuming
the
Power
Cell
has
been checked and
the
Test
Set
properly
connected
to
Ihe
movement,
yd
bhfl
meter
indicates
zero
current,
perform
the following
simple
test:
Remove
the
plug-Up
lead
from
the |ack
in
the
movement
holder
and
touch
it
to
the
lead strap
screw between
the
two
coil
assemblies.
The
defective (open)
coll
may
be
identified
by whether
the
current indicated
by
the motor:
a.
Remains
xero— Replace
the
cell
coil
assembly
b.
Becomes
excessive-Rep
I
ace
the
compnnent
coil
assembly
INDD
NHEa
Checking
Ihe
Train
for
I-'reedom
This
•
heck
in
h'i.mI
to
il.ti-i
nunc whether
there
is
any
mechanical blockage
of the
pa
ti.im
The
roonl scnnftlvp .mil
convenient
method
of
checking
the
train
freedom
is
to
pluck,
M
twang"
the
line;
of
the tuning fork to
which
the
index
finger
is
atlachod.
When
this
in
done,
the fork
will
vibrato for
a
few
seconds
and
this
motion
will
be
trans-
mitted
to
the
train—
if
it
is
not blocked.
The
motion
of the
Iraln
can
easily
he
seen
by watching any
of
the
wheels
at
the
time
that
the
fork
is
being
plucked.
If
no motion
of the
gears
Is
apparent
when
the fork
j*
plui
kril,
this
in
evidence
ol n
blocked
train,
assuming
that
the
indexing
linkage
ban
already
been
nliecked.
Tin-
freedom
of
tho
train
may BUM
bo checked
by simply
moving one
of the
whreln
with
a
tweezers or needle with both
pawl
and index
collets
rotated lo
disengage
the
respective jewels
from
Ihe
index wheel.
Hack Mechanism
Inspection
and
Adjustment
PAWL
PAWL
FINGER
Lin
PIN
1.
Pull
stem out
(setting position).
2.
Pawl
jewel should
be from
*4
lo 1
Jewel
thickness
away
from
index wheel. (Sec
Fig. 22.)
If
necessary
adjust
by
bending
pawl
lift
pin
Fig.
22
2Q
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