IBM System/34 Maintenance Manual page 81

Old Style Motor Replacement
1.
2.
3.
4.
5.
6.
7.
8.
9.
DANGER
CB1 must be off to remove AC voltage from ACTB3
and ACTB4.
Install the motor in its mounting bracket. Ensure
that the motor cool air holes face upward and the
motor cable is at the bottom left. Install the three
screws
e
that hold the motor in the mounting
bracket.
Put a very thin layer of grease on the pivot points
of the motor assembly.
Lift the motor assembly into position and slip the
tapered pin on the mounting bracket into the hole
in the subframe. At the same time, place the
brake end of the motor assembly on the pivot.
Install the washer and clip
0,
and tighten the
pivot • .
Place the blade of a screwdriver into the roller
0
and lift the roller .and tension spring into the motor
mounting bracket.
Pivot the motor against the tension springs to
ensure correct position of the spring loop and
roller.
Install the motor wires on ACTB3 lower drive, or
ACTB4 upper drive
e -
terminal 1 (blue wire),
terminal 2 (white wire), and terminal 3
(green/yellow wire).
Install 'the brake wires on TB1
e -
terminal 5
(black wire) and terminal 6 (yellow wire).
Install the safety cover on TB1 (holes to the left).
10. Install the cable straps. that hold the brake
cable.
8
11.
12.
13.
14.
15.
16.
17.
09-030
CAUTION
Ensure that the belt does not touch the disk speed
transducer.
Lift the motor and pivot it toward the disk
enclosure and reinstall the belt
Ct
(smooth side of
the belt against the pulleys). Center the belt on
the pulleys.
Loosen the two screws • that hold the spindle
locking arm. Slide the locking arm away from the
disk spindle.
Ensure that the antistatic brush is touching the
center of the disk spindle.
Note: If there is a worn spot on the spindle
antistatic brush, put the spot back on the same
place on the spindle.
Tighten the screws on the spindle locking arm.
Check that the spindle antistatic brush has a
pressure of approximately
60
(+25 to -20) grams
on the center of the disk spindle. Adjust, if
necessary, by removing and bending the brush.
Install the belt guard
G.
Slide the belt guard all
the way to the left and tighten the screws.
Unlock the actuator lock" by moving the handle
to OFF.
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