- 2-
(B-13$)
speed, or two-thirds the speed, or some other multiple, even though
the
s
p
o
ts appeared to be stationary
when viewed
through the speed
indicator
shutters.
This
should
be kept in nd.nd if trouble
is
experienced in the operation of the unit.
Vfuen
i
n
cr
e
as
in
g
or decreasing the
mo
t
o
r speed, the
speed adjusting
lever or
the
gov
e
r
no
r
adjusting bracket, respectively, should be
momentari�
d
ep
r
e
sse
d
.
.
See Figure
83
£o
r location of parts.
TO
MEASURE �EIVING RANGE
llounted on the le.£t end
of
the
main shaft of the
pr
inter is the range
finder assembly which is used tor the purpose of orientating the selector tb
the i ncoming signals.
Before p
r
o
c
e
e
ding t
o
me
a
s
ur
e t
h
e
re
c
eivi
n
g range
on a
unit equipped
with a pu lling
magnet
selector, turn the selector armature
s
p
ri
n
g adjusting
screw
to
a
position where
it will require
6 to 6-3/8
ozs.*
to
stretch the arma
ture
spring to its position length.
Then
transmit RY (the letters R Y sent
alternately) to the printer
continually
while the
receiving range is bei
ng
determined. The
rang
e
m.q
be taken as follows:
(*)
lf
unit is equipped
with a
holding
magnet
selector, see Armature
Lever Spring Tension Adjustment on Page
25.
While
RY is bei ng received, loose n the
index arm
thumb screw an:l
shift the index arm o£ the range finder toward
0
un
t
i
l
errors appear in the
copy. Then move the arm back slowly untU errors no longer appear; at least
72
characters should be received without error, This position indica tes one
limit of the orientation range. Note the position of the index
arm
on the
scale. Determine the opposite end of
the
receiving range by repeating the
foregoing procedure with the index arm near the opposite erli
of
the scale.
After the two limits of the receiving range have been found, set the index
arm
ot
the
range scale midw81' between these two points.
NOTEs
lf
facil ities for transmit
t
i
ng
b iased test signals to the
receiving
unit
are
available, the index arm should be set at the optimum
setting for
the
reception of biased signals.
THE
FOU.OWING PARAGRAPH
APPLIES ONLY TO UNITS �UIPPED
�w'ITH lULLING
MAGNXI'
SELECTatS CONNECTED DIRECTLY (NO LINE RELAY) INTO
A
LD�E CIRCUIT
WITH
BIASED
SIGNALS.
Tum
the
armature spring
adjusting screw
in
a clockwise directicn
untU errors a
p p
ear in t
he
copy.
Then, from this point,
count the number ot
turns the adjusting screw can be turned
in
a
counter-clockwise
direction before
errors
again appear in the copy.
Turn the adjusting
screw backward (clockwise)
half'
thie
ttumber
of' turns to
a
point
midway
betwee n the two
tailing
points, or
the middle of the armature spring range,
and
lock the adjusting screw
with its
lock
n
ut.
If
no
errors
appear
in the copy throughout the .entire r
a
ng
e ot the
spring,
se
t
the spring te nsion at
6
to
6-3/8
ozs.
and lock the
ad
j
u
s
t
in
g screw.
The orientation range
should
be rechecked after the armature
s
pr
ing
range has
been determined.
en
-.J
1'\)
J>.,
v
.....
w
CXJ
