IBM 3274 51C Maintenance Information page 288

F.3.4.4 Capacitor Replacement (Figure F-31)
1. Reinstall the capacitor assembly
CD
with the screw
e
and tighten the screw.
2. Reinstall the motor capacitor leads
CD
on the capacitor
terminals
0
(leads 2 and 3 on the top terminal and
lead 1 on the bottom terminal).
3. Reinstall the two insulator caps
CD
on the capacitor
terminals.
F.3.4.5 Drive Fan and Pulley Assembly Removal
(Figure F-31)
1. Power down.
I
DANGER
Voltage is still present at the socket when the power
cable
e
is disconnected.
2. Disconnect the ac drive motor cable
e .
3. Remove the ac drive belt
CD .
4. On all domestic machines or World Trade machines prior
to EC 841505, remove the fan enclosure mounting
screws
G
and remove the fan enclosure
G.
On World
Trade machines with EC 841505 and later, remove the
ac drive motor
0
with the two mounting screws
0 .
5. Loosen the setscrew
Q) ;
then remove the ac drive
motor pulley/fan
0 .
F.3.4.6 Drive Fan and Pulley Assembly Replacement
(Figure F-31)
1. Reinstall the ac drive motor pulley
0
on the motor
shaft so that the setscrew
CD
is centered in the flat sur-
face of the shaft. (Leave the setscrew loose.)
2. Position the fan and pulley on the motor shaft with a
gap of 0.5 mm
±
0.1 mm (0.020
±
0.004 inch) between
the motor face and the fan hub. Tighten the setscrew.
3. On all domestic or World Trade machines prior to
EC 841505, with the mounting screws
G,
reinstall the
fan enclosure
m
with the belt clearance slots toward
the drive hub
G.
On World Trade machines with
EC 841505 and later, reinstall the ac drive motor.
4. Reinstall the drive belt
CD .
5. Reconnect the ac drive motor power cable
e.
6. Power up.
Appendix F. IBM 51 TD Diskette Drive Maintenance F-45