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Drivemotor Thrust
Turntable Height
Play Takeup Clutch
4-
8
disc (
65).
The
capstan
thrust
is
ad justed by a set-screw (
70).
End
play
of
.010
in.
to
.015 in.
is
required,
and
is
obtained
as follows:
Step I: Coar
the
nylon
thrust
disc liberally wirh wheel
bearing
grease
and
drop
it
through
the
threaded
ho
le in
the
sub-place (
1)
over the capstan shaft.
Step 2: I
nsert
the
sec-screw,
and
tighten
down
unti
l
it
is felt
co
bot-
tom
on
the
thrust
disc.
Step
3:
Grasp the capstan flywh
ee
l (
42)
between rhe
thumb
and
in-
dex
finger.
Step
4:
While
maintaining
a sl
ight
downward
pressure
on
the
head
of
the
set-screw
with
the
screwdriver (
to
simulate
the
pressure
th
at
will l
ater
be applied by rhe loc
king
screw)
stare backi
ng
the
screw off slowly,
and
work
the
capstan flywheel
up
and
down
unt
il
an
audible click
at
the
ends
of
its travel indicates
the presen
ce
of
end
play.
This
will usually occur
when
the
set-
screw has been backed off
approximately
¼
of
a turn.
At
this
po
i
nt
, e
nd
play should
be
in
the
required range.
Step
5:
Tighte
n
the
locking
nut
on che ser scr
ew,
then
re
check
end
play.
Turntable
height
(
the
distance measured from che
top
surface
of
the
turntab
le (
78)
to
the
perforace<l metal
grille)
should
be
.125 in., ±
.008
in. Th
is
hei
ght
is
det
ermined by che repla
cement
of
lami
co
id washers
be
c
wen
the
bottom
of
the
turntable
p ivor (
24
or
3
6)
and
ch
e
hairpin
retainer on t
he
sha
ft
through
the pivot. Difficulties in
tape
tracki
ng
traced to im
pr
oper
rurntab
le
height
may be corrected by increasing
or
decreasing the n
umber
or thickness
of
these washers.
T
he
play
takeup
cluccl, assembly consists
of
a felt-lined
aluminum
disc
( 1
8)
,
and
a bakelite clutch ( 1
9)
which
is
spring-loaded
co
the
disc.
When
the
macl,i
ne
is
in
the
pl
ay
mode, che clutch
is
driven by rhe rub-
ber
belt
(69)
on
the
play rakeup pulley
(40).
Location of rhe felt-lined
al
umi
n
um
disc is
cr
itical
-a
clearance
of
.0
15
in. being required
be
-
tween
rhe
end
of
the
oi
l ire
bear
i
ng
( 21)
which
goes
through
rhe bake-
lice clutch (
1
9),
and
the
bortom
of
the
aluminum
disc (
18).
This
clear-
ance, which can
not
be
measured d irectly
with
a
ga
uge because of
th
e
physical ar
rangement
can
be
sec
quire
accurately by the following in-
direa
m
ethod
:
Step
I:
in
sert
a removable .0 I 5 in.
shim
or
feeler gauge
between
the
thrust
washer
that
rides on
the
i
nn
er
race of
the
lower ba
ll
bearing
(
22)
of
the
takeup
turntable
pivor (
24)
and
oilite
bush
ing
(
21).
Step 2: Assemble
the
conical
spring
(
20),
the
bakelite clutch ( l
9),
and
t
he
fe
lt
-l
ined
aluminum
disc (
18)
( in that
order)
on
rhe
tu
rnt
able
shaft
(
29).
Step 3:
Guide
rhe
end
of
the
oilice bushi
ng
through
the
hole in
the
center
of
the
bakeli
ce
clutch,
and
press
the
aluminum
disc
down
unti
l it borcoms firmly
on
th
e
end
of
the bushing.
Step
4:
H
olding
the
disc place in place,
tight
en the set screw in its
hub.
Step
5:
Remove
the
shim
or
gauge.
The
expansion
of
the
conical
spring
wi
ll
then
force
the
oilice
bushin
g back off
the
alumi-
num
disc, rhus creating
the
r
equi
red .015 in. clearance.
'
J
The
rubber-tired bakelite rewind
(31)
and
fast forward clutches
must
line
up
with
the
shock
relief
brake rollers (
5)
so
that
the
rollers
engage
the
full
width
of
the
tires.
ln
addition, rhe
rewind
clutch
(31)
should
be
aligned
for full-width conracc
with
the
rewind
idler (
7)
and
the
fast
forward clutch (
16)
for
full
width
contact
with
the
motor
pulley (
61).
The
capstan speed
wi
ll
not
vary, since
the
capstan
is
driven
by
a
no
n-
slipping
nylon belt
and
synchronous motor. N o
adjustment
of
the
cap-
stan
speed will
be
necessary.
If
it is desired
co
check
the
capstan speed,
use a pre-recorded
5000
cycle tape, chat has been rec
orde
d
on
a
machine
of
known
accuracy,
and
an
eleccronic frequency
co
unter.
TABLE
4-1
Trouble
Tr
oubleshooti11g
PLAY Mode/ M,dfrmctions
Probable Cause
EXCESSIVE
OR
ERRATIC
HOLDBACK
TENS
I
ON
EXCESSIVE TAKE.UP
TENSION
DRIVE.MOTOR
OUT
OF
SYNCHRONISM
1.
Contaminated
rewind
clutch felt
(
30).
2.
Contaminated
rewind clutch
tire
(
31).
3. R
ewi
nd clutch s
pring
(32)
too
stiff.
Thi
s actually indicates
tam-
perin
g
or
carelessness in reasembly.
It
is
advisable
to
replace
the
spring
rather
than
ro
attempt
makeshift
read juscment.
I.
Contaminated
play cakeup clut
ch
felt
(
18).
2.
Oilite
bearing
(
21)
bottoming
on
aluminum
clutch disc
(18).
Mini-
mum
clearance should
be
.OJ
5".
See s
ub
-
para
graph
8.4
below
for
adjustme
nt
procedure.
3.
Takeup
clutch
spring
(20)
too
stiff.
l.
Line
voltage
below 105 volts a-c.
2.
Excessive play rakeup tension. See
tro
uble above.
3.
Ny
lon
dr
i
ve
belt
(
68)
tension ex-
cessive. See
sub-paragraph
8.1 be-
lo
w.
4.
l3e
lt
tensioning
idler
(55)
drag-
gi
ng.
5.
Drivemoror
thrust
misadjusted. See
subparag
raph
8.2 below.
6.
Defeaive
drivemocor
starting
ca-
pacitor.
7.
Dry
bearings in drivemoror (
63),
capstan (
42),
or
capstan idler
(79).
See lubricat
ion
instruc
tions.
8. Defective
driv
emoro
r (
63).
Rew
i
nd
and
Fast
Fo
r
ward
Clutch Alignmen,t
Capstan Speed
4-9
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