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Replacement
1.
Check that the two plastic insulating bush-
ings
13
are installed in the motor pivot
holes of the subframe casting and the motor
mounting plate.
2.
Lift the motor onto the pivot points and
slide it into position.
3.
Install the plastic insulating washer
II,
flat
washer, lock washer, and fixing nut on the
pivot at the back of the subframe.
Ti~hten
the nut until the lock washer is just com-
pressed, then unscrew the nut one-half turn.
4.
Lift the loop end of the tension spring into
place on the motor mounting bracket
m .
5.
Pivot the motor against the tension springs
to ensure correct seating of the spring loop.
6.
Install the motor wires on DETB1
EI -
ter-
minal 1 (blue wire) terminal 2 (white wire),
and terminal 3 (two green/yellow wires).
7.
Install the brake wires from DETB1
EI -
terminal 5 (black wire) and terminal 6
(yellow wire).
Locke~
~
(\~~
~
:~
Unlocked -
'-f"
.
~
~S
Back View
8.
9.
Install the safety cover on DETB1 (holes to
the left).
I nstall the cable straps
m
(if present) that
hold the motor, brake, and ac cables.
10.
CAUTION
Make sure the belt does not contact the disk
speed transducer.
Replace the belt
II
(smooth side of the belt
against the pulleys). Center the belt on the
pulleys.
11 .
Loosen the two screws
II
that hold the
spindle locking arm. Slide the locking arm
away from the disk spindle.
12.
Make sure that the antistatic brush is con-
tacting the center of the disk spindle.
Note: If there is a wear crater on the
spindle antistatic brush, realign the crater to
the spindle.
'---II
m
Front View
13.
Tighten the screws on the spindle locking
arm.
14.
Check that the spindle antistatic brush has a
pressure of 60
+
25 - 20 grams on the center
of the disk spindle. Adjust the brush, if
necessary, by removing and forming the
brush.
15.
Install the belt guard and tighten the two
screws
II.
SI ide the belt guard all the way
to the left and tighten the screws.
16.
Unlock the actuator lock
II
by moving the
handle to OFF.
CAUTION
New style and old style motor tension springs
are not interchangeable. The part number is
etched on the new style spring.
13
Disk Drive
2-16.1
TNL: SN31-0487 to SY31-0373-4 (25 Nov 77)
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