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223
JACKS
HAFT
HOUSING
(Page 2
of
2)
Service
Check
The jackshaft housing should be centered over the
spindle. The jackshaft housing
II is positioned
at
the
factory using the stop washer
II
as a reference. Check
that the jackshaft housing is touching the washer under
the stop screw. Then check that the stop screw
II is
tight.
If
both
of
these conditions are OK and you still
suspect a jackshaft housing problem,
do
the following:
1.
Power
down
and remove the. tape unit
from
its
mounting.
2.
3.
Remove the fan.
Observe
the
slight side
to
side movement available
between
the
spindle carrier arm
II
and the brake
arms
II.
Notice that the arm can be easily moved
in either direction until the spring tension on the
brake arms are met, and
with
more
difficulty
as
you overcome
that
tension.
4.
Move
the spindle carrier arm
to
the right until the
tension
of
the brake arm spring is
just
met.
5.
Measure the gap (with feeler gauges) between the
spindle
II and the
left
jackshaft roll
II.
6. Move the spindle carrier arm
II
to
the
left
until
the tension
of
the brake arm spring is just met.
7.
Measure
the
gap (feeler gauges) between the
spindle
II and the right jackshaft roll
II.
The
difference between both measurements
must
be
less than 0.003 inch (0.076 mm)
or
a jackshaft
housing adjustment is necessary.
Note:
If
the jackshaft housing must be removed, and a
readjustment
of
the housing is not intended, check
to
see
that
the stop washer is against the housing before
you remove the housing.
Adjustment
1.
2.
3.
4.
5.
6.
7.
8.
Power
down
and remove the tape unit
from
its
mounting.
Remove
the
tape drive
motor
(two
screws) and fan
to
access the jackshaft housing screws
II.
Loosen the
two
jacks haft housing screws and the
stop screw
II.
Slide the jackshaft housing II
from
side
to
side
and note
that
the unit moves easily until
the
spring
tension is met. More
effort
is
now
required
to
move the unit. Slide the housing towards the stop
screw and washer until the spring tension is just
met. Tighten the
left
jackshaft housing mounting
screw.
Locate the stop washer
II
against the jackshaft
housing
II and tighten the stop screw
II.
Loosen the
left
jackshaft housing screw
II.
Slide
the jackshaft housing
to
the right until you
just
meet the spring tension as in step 4. Tighten the
left
jackshaft housing mounting screw.
Measure and record the distance between the stop
washer and the jackshaft housing. For example:
0.020 inches. Divide this in half, 0.010 inches, and
place this size feeler gauge between
the
washer
and the housing.
Now
loosen the
left
jackshaft
housing screw and slide the unit
to
the
left
until
the unit is
firmly
against the feeler gauge and the
washer. Tighten both jackshaft housing screws.
Loosen the stop screw, move the stop washer
against the jackshaft housing, and retighten the
stop screw.
Do the jackshaft housing service check.
9.
Perform the select magnet service check (see 222).
10. Reinstall the
motor
and the belt
if
the service
check is OK.
Tape
2·27
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