FRIDEN STW - Page 6

faze #
MODEL STW
FRIDEN
CALCULATING
MACHINE
CO.,
INC.
HOW THE MACHINE WORKS
To
better
your
performance
as
a
Friden
Serviceman,
it
is
well
to
know
all
the
functions
of
the
machine
you
are
working
with.
Taken
asa
whole,
the
machine
looks
complicated
when
looking
at
it
as
a
complete
machine.
The
mystery
of
the
Friden
Calculating
Machine's
operation
becames
sim-
plified
when
its
various
performances
are
broken
down
to
the
individual
parts
involved,
Each
and
every
part,
screw,
link,
stud
and
spring
in
the
machine
has
a
definite
job
to
do;
and
when
the
functions
of
these
parts
become
knowa
te
you,
much
of
the
mystery
disappears.
A
little
time
for
study
of
your
ma-
chine
each
day
will
pay
big
dividends
in
your
being
able
to
overcome
serv-~
iee
problems
more
quickly
and
efficiently.
You,
as
a
Serviceman,
are
not
particularly
interested
in
the
more
in~
voived
applications
of
the
Machine
-
this
is
the
Salesman’s
territory,
but
you
definitely
should
know
what
all
the
Keys
and
Controls
are
intended
to
da
and
how
they
operate.
Learnto
operate
the
machine
so
you
may
better
test
it
after
corrections
have
been
made
and
know
that
it
operates
accu-
rately.
When
you
have
learned
to
operate
a
Friden
Caiculator,
learn
how
each
operation
is
accomplished
mechanically
by
tracing
out
all
the
parts
in-
volved
in
that
operation;
learn
whateach
part
contributes
to
the
success-
ful
completion
of
the
operation.
When
a
machine
fails
or
errors
occur,
it
is
usually
due
te
seme
part
or
combination
of
parts
failing
to
do
what
they
shouldda,
This
may
be
caused
by
wear,
a
loosened
screw,
adis-
connected
or
broken
spring,
or
any
one
of
a
number
of
things
that
may
happen
to
parts.
If
you
know
the
parts
in
the
operation
which
failed,
it
is
relatively
easy
to
trace
the
operation
through
and
locate
the
offending
member.
Quite
often,
more
than
half
the
time
for
repairing
8
machine
is
in
locating
the
source
of
trouble.
Diagnosis
of
machine
troubles
is
a
skill
that
cen
be
acquired
only
through
study
of
the
machine,
the
Service
Manuals
and
through
much
experience.
The
following
pages
of
this
Service
Manual
are
for
the
purpose
of
ac-
quainting
you
with
some
of
the
more
basic
operations
of
the
Friden
Cal-
culating
Machine.
As
you
study
each
drawing,
follow
out the
operation
on
a
machine.
For
axample,
see
for
yourself
what
takes
place
when
a
numeral
key
is
depressed
in
the
Main
Key
Board.
Note
that,
as
the
key
goes
down,
the
Key
Lockbar
engages
a
notch
in
the
Keystem
to
held
it
down;
the
stud
on
the
bottom
of
the
Keystem
slides
along
an
incline
on
the
Selecting
Bar,
moving
it
toward
the
frontcf
the
machine
and
position-
ing
the
Selecting
Gear
to
the
proper
Segment
on
the
Actuator.
This
il-
lustration
ia
very
elementary,
it
is
true;
but
remember,
every
operation
in
the
machine
becomes
elementary
when
taken
in
small
doses,
ps
6-15-50