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13
I
Checking
motor
brake
1
Turn the brake shoe and check that springs A do
not touch
the brake housing
at point B
2
Check
that
springs A do not contact
the dust
washer
inside the brake shoe.
Adjustment:
Insert
feeler
gauge C as to Fig.
springs
and adjust
the springs.
Tighten
the
retaining
screws,
remove
the
feeler
gauge
and
repeat
checks
1 and 2.
If the brake housing
has been removed
from the
motor mount
or the brake
shoe
has been replaced,
the brake housing must
be positioned
correctly
relative
to the electrical
zero
position
of the
motor
shaft.
Supply approx
1A to the motor
win-
ding L-10 and tighten
the brake at the position
assumed
by the brake shoe.
J
Checking
and replacing
capstan
Remove the stepper motor
and cover A (Fig.
Z
in section
F) and check that the capstan
rota-
tes easily.
See that the chad exhaust
is not
pulled out when
cover A is removed.
Remedy:
Replace
capstan
as instructed
below.
Loosen
lock screw
C.
Press
capstan
out carefully
using mandrel
VI.
Press
in the new capstan manually.
Press
in the capstan
to its correct
position
using mandrel
V.
Tighten
lock
screw
C.
NO
OMPOND
K
Checking
transmission
between
stepper
motor
z
and capstan
L
Checking
pinch
roller
Unscrew
and remove
the
motor
brake.
Lift the pinch roller
away
from the capstan.
Turn
the motor
shaft
and
check
that
the
transmission
does
not
bind
Adjustment:
Unscrew
yrn the
motor shaft
120°
or
240°.
If it still
binds,
replace the capstan.
Check that there are no
binds
or mold marks
at
D (6 grooves),
If binding
persists
after
the capstan
is re-
placed,
the motor
mount
must
be replaced.
1
Unhook
spring D.
2
Check as shown
in Fig. a that the pinch roller
exerts a force of 5.88 ~ 0.49N (600 * 50gf)
against
the capstan.
Fitting
punch/feed
unit
Remove
cover
C.
Check that
pinch roller A rotates
easily.
Check
that there
are
no defects
on the peri-
phery of the pinch
roller.
Remedy:
Replace
pinch
roller.
6
Check that the pinch roller
flanges do not run
in any of the tracks on the tape.
Adjustment:
Insert
washers
between
arms E and
When
fitting
the punch/ feed unit,
check
that
its reference
edge is 0.4 = 0.1mm above the
reference
edges
of the tape slots
in the
right-hand
and left-hand
sidewalls.
ween
the rubber
antivibration
mountings
and
the punch/feed
unit.
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