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Replacement
1.
2.
3.
4.
5.
Move the head to track 74 (uppermost
position).
Place the head wires between the dust cover
and the foam.
Replace the dust cover, spring, and wires.
Ensure that there is no tension on the head
wires.
Replace the file control card.
3.2.11 Leadscrew and Head Carriage
Assembly
Removal
1.
2.
3.
Turn power off at the operator control
panel.
Remove the 33FD from the machine
(3.2.5).
Note routing of the head cable.
4.
Remove the leads from the connector by
pushing down with small screwdriver as
shown:
5.
Center the head carriage on the leadscrew by
turning the stepper motor wheel. Remove the
leadscrew dust cover (if installed) (3.2.10.1).
6.
7.
8.
--(
(
,
--~
Remover stepper motor
II
and leadscrew
wheel
II .
Remove covers (3.2.8).
Loosen clamping screws on upper and
lower stops
II .
9.
Remove bottom bearing
m
CAUTION
Watch for preloaded spring
a
when
removing the shaft.
3-14
10.
Slide leadscrew assembly down until top
clears baseplate, then slide assembly out.
CAUTION
Do not allow pressure pad arm to snap
against the head.
11.
Remove top bearing and both stops from
leadscrew.
Replacement
Note:
If the leadscrew and the head carriage are
disassembled, replace by threading the leadscrew
into the bottom portion of the head carriage
assembly and into the carriage nut and spring.
There should be approximately 0.020 inch
(0.51 mm) gap
lEI .
1.
2.
3.
4.
5.
6.
7.
Center the head carriage assembly on the
leadscrew and install upper and lower
limit stops.
Replace top bearing and preloaded spring
(concave side up).
Replace head carriage assembly into base-
plate, bottom end first.
Replace bottom bearing and check for
about 0.030 inch (0.76 mm) up and down
movement of the leadscrew against the
preloaded spring.
Replace leadscrew wheel, leadscrew
wheel clamp, and stepper motor.
Note:
Route head cable as noted under
removal.
Connect wires (see
Removal
for wire loca-
tions). Check that wire leads are properly
seated and securely fastened in cpnnector.
Do stepper motor adjustment (3.2.21)
and read/write head adjustment (3.2.17).
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